CROWN CASTLE INTERNATIONAL CORP
S-4/A, 1998-03-11
COMMUNICATIONS SERVICES, NEC
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<PAGE>
 
     
  AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 11, 1998     
                                                    
                                                 REGISTRATION NO. 333-43873     
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                ---------------
                                 
                              AMENDMENT NO. 1     
                                       
                                    TO     
                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
 
                                ---------------
                        CROWN CASTLE INTERNATIONAL CORP.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
                                ---------------
       DELAWARE                   4899                    76-0470458
    (STATE OR OTHER         (PRIMARY STANDARD         (I.R.S. EMPLOYER        
     JURISDICTION              INDUSTRIAL          IDENTIFICATION NUMBER)
  OFINCORPORATION OR       CLASSIFICATION CODE                                
     ORGANIZATION)               NUMBER)                                      
                                      
                                      
  
  
  
 
                                ---------------
    510 BERING DRIVE SUITE 500 HOUSTON, TX 77057 (TELEPHONE: (713) 570-3000)
   (ADDRESS AND TELEPHONE NUMBER OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
                                ---------------
                                    COPY TO:
 STEPHEN L. BURNS, ESQ. CRAVATH, SWAINE & MOORE 825 EIGHTH AVENUE NEW YORK, NY
                                     10019
 
                                ---------------
  APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC. As soon as
practicable after this Registration Statement becomes effective.
 
  IF THE SECURITIES BEING REGISTERED ON THIS FORM ARE BEING OFFERED IN
CONNECTION WITH THE FORMATION OF A HOLDING COMPANY AND THERE IS COMPLIANCE WITH
GENERAL INSTRUCTION G, CHECK THE FOLLOWING BOX. [ ]
 
  IF THIS FORM IS FILED TO REGISTER ADDITIONAL SECURITIES FOR AN OFFERING
PURSUANT TO RULE 462(B) UNDER THE SECURITIES ACT, CHECK THE FOLLOWING BOX AND
LIST THE SECURITIES ACT REGISTRATION STATEMENT NUMBER OF THE EARLIER EFFECTIVE
REGISTRATION STATEMENT FOR THE SAME OFFERING.  [_] .............................
 
  IF THIS FORM IS A POST-EFFECTIVE AMENDMENT FILED PURSUANT TO RULE 462(D)
UNDER THE SECURITIES ACT, CHECK THE FOLLOWING BOX AND LIST THE SECURITIES ACT
REGISTRATION STATEMENT NUMBER OF THE EARLIER EFFECTIVE REGISTRATION STATEMENT
FOR THE SAME OFFERING. [_] .....................................................
 
                        CALCULATION OF REGISTRATION FEE
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
   
   TITLE OF EACH CLASS OF    AMOUNT TO BE    OFFERING      AGGREGATE         AMOUNT OF
SECURITIES TO BE REGISTERED   REGISTERED  PRICE PER UNIT OFFERING PRICE REGISTRATION FEE(2)
- -------------------------------------------------------------------------------------------
<S>                          <C>          <C>            <C>            <C>
 10 5/8% Senior Discount
  Notes due 2007(1).....     $251,000,000    $605.08      $151,875,080      $44,803.15
</TABLE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
(1) The "Amount to be Registered" with respect to the 10 5/8% Senior Discount
    Notes due 2007 represents the aggregate principal amount at maturity of
    such notes. The 10 5/8% Senior Discount Notes due 2007 were sold at a
    substantial discount from their principal amount at maturity. The
    registration fee with respect to the 10 5/8% Senior Discount Notes due 2007
    was calculated based on the approximate accreted value thereof as of
    January 8, 1998 determined pursuant to the provisions of the indenture
    governing such notes.
   
(2) Calculated pursuant to Rule 457. Previously paid.     
 
                                ---------------
 
  THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION, ACTING
PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A         +
+REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE   +
+SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY  +
+OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT        +
+BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR   +
+THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE      +
+SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE    +
+UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF  +
+ANY SUCH STATE.                                                               +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                   
PROSPECTUS      SUBJECT TO COMPLETION, DATED MARCH 11, 1998     
                                  $251,000,000
                        CROWN CASTLE INTERNATIONAL CORP.
   
 OFFER TO EXCHANGE ITS 10 5/8% SENIOR DISCOUNT NOTES DUE 2007, WHICH HAVE BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, FOR UP TO $251,000,000
 PRINCIPAL AMOUNT AT MATURITY OF ITS OUTSTANDING 10 5/8% SENIOR DISCOUNT NOTES
                                 DUE 2007     
                                 -------------
 
  The Exchange Offer will expire at 5:00 P.M., New York City time, on       ,
unless extended.
 
  Crown Castle International Corp., a company incorporated under the laws of
Delaware ("CCIC" or the "Company"), hereby offers, upon the terms and subject
to the conditions set forth in this Prospectus and the accompanying Letter of
Transmittal (which together constitute the "Exchange Offer"), to exchange its
10 5/8% Senior Discount Notes due 2007 (the "New Notes") which have been
registered under the Securities Act of 1933, as amended (the "Securities Act"),
pursuant to a Registration Statement (as defined herein) of which this
Prospectus constitutes a part, for up to $251,000,000 aggregate principal
amount of its outstanding 10 5/8% Senior Discount Notes due 2007 (the "Old
Notes"), of which $251,000,000 aggregate principal amount is outstanding as of
the date hereof.
 
  The New Notes will evidence the same debt as the Old Notes and will be issued
under and be entitled to the same benefits under the Indenture (as defined
herein) as the Old Notes. In addition, the New Notes and the Old Notes will be
treated as one series of securities under the Indenture. The terms of the New
Notes are identical in all material respects to the terms of the Old Notes,
except for certain transfer restrictions, registration rights and terms
providing for an increase in the interest rate on the Old Notes under certain
circumstances relating to the registration of the New Notes. The New Notes and
the Old Notes are collectively referred to herein as the "Notes." See
"Description of the Notes."
 
  The New Notes will mature on November 15, 2007. The Old Notes were issued at
a substantial discount to their principal amount at maturity, and were sold at
a price to investors that yielded gross proceeds to the Company of
approximately $150.0 million. The Accreted Value (as defined) of the New Notes
will be calculated from the date of issuance of the Old Notes. The New Notes
will accrete in value until November 15, 2002. Thereafter, cash interest will
accrue on the New Notes and will be payable semiannually in arrears on May 15
and November 15, commencing May 15, 2003, at a rate of 10.625% per annum. The
New Notes will be redeemable at the option of the Company, in whole or in part,
at any time on or after November 15, 2002, at the redemption prices set forth
herein, plus accrued and unpaid interest and Liquidated Damages (as defined),
if any, thereon to the date of redemption. In addition, prior to November 15,
2000, the Company may redeem up to 35% of the original aggregate principal
amount at maturity of the New Notes at 110.625% of the Accreted Value (as
defined) thereof, plus Liquidated Damages, if any, to the redemption date with
the net cash proceeds of one or more Public Equity Offerings or Strategic
Equity Investments (each as defined); provided that at least 65% of the
original aggregate principal amount at maturity of the New Notes remains
outstanding immediately after the occurrence of each such redemption.
 
  Upon the occurrence of a Change of Control (as defined), each holder of New
Notes will have the right to require the Company to purchase all or any part of
such holder's New Notes at a purchase price equal to 101% of the Accreted Value
thereof, plus Liquidated Damages, if any, to the date of purchase prior to
November 15, 2002 or 101% of the aggregate principal amount thereof, plus
accrued and unpaid interest and Liquidated Damages, if any, to the date of
purchase on or after November 15, 2002. See "Description of the Notes."
   
  The Notes represent general unsecured obligations of the Company and rank
pari passu in right of payment with all current and future unsecured senior
Indebtedness (as defined) of the Company. The operations of the Company are
conducted through its subsidiaries, and the Company's subsidiaries will not be
guarantors of the Notes. Accordingly, the Notes are effectively subordinated to
indebtedness and other liabilities of such subsidiaries, including borrowings
under the Senior Credit Facility (as defined). As of November 25, 1997, the
Company's subsidiaries had no indebtedness outstanding, and approximately $8.9
million of other outstanding liabilities. As of January 5, 1998, the Company's
principal operating subsidiary had indebtedness amounting to approximately $4.7
million, representing borrowings under the Senior Credit Facility, and unused
borrowing availability under the Senior Credit Facility of approximately $93.6
million. The Company has provided a limited recourse guaranty of the Senior
Credit Facility, limited in recourse only to the capital stock of certain of
the Company's subsidiaries. The Company currently has no secured indebtedness.
    
                                                        (continued on next page)
                                 -------------
 
  See "Risk Factors" beginning on page 19 for a discussion of certain factors
that holders of the Old Notes should consider in connection with the Exchange
Offer and that prospective investors in the New Notes should consider in
connection with such investment.
                                 -------------
 
 THESE SECURITIES HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE SECURITIES AND
  EXCHANGE  COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION  NOR  HAS  THE
   SECURITIES AND  EXCHANGE COMMISSION  OR  ANY STATE  SECURITIES COMMISSION
    PASSED  UPON   THE  ACCURACY   OR   ADEQUACY  OF   THIS  PROSPECTUS.ANY
     REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
The date of this Prospectus is         , 1998.
<PAGE>
 
                                                   (Continued from front cover)
 
  The New Notes are being offered hereunder in order to satisfy certain
obligations of the Company under the Registration Rights Agreement dated as of
November 25, 1997 (the "Registration Rights Agreement") between the Company
and Lehman Brothers Inc. and Credit Suisse First Boston Corporation, as the
initial purchasers of the Old Notes (the "Initial Purchasers").
 
  The Company is making the Exchange Offer in reliance on the position of the
staff of the Securities and Exchange Commission (the "Commission") as set
forth in certain no-action letters addressed to other parties in other
transactions. However, the Company has not sought their own no-action letter,
and there can be no assurance that the staff of the Commission will make a
similar determination with respect to the Exchange Offer as in such other
circumstances. Based upon these interpretations by the staff of the
Commission, the Company believes that New Notes issued pursuant to this
Exchange Offer in exchange for Old Notes may be offered for resale, resold and
otherwise transferred by a holder thereof other than (i) a broker-dealer who
purchased such Old Notes directly from the Company to resell pursuant to Rule
144A or any other available exemption under the Securities Act or (ii) a
person that is an "affiliate" (as defined in Rule 405 of the Securities Act)
of the Company without compliance with the registration and prospectus
delivery provisions of the Securities Act, provided that such New Notes are
acquired in the ordinary course of such holder's business and that such holder
is not participating, and has no arrangement or understanding with any person
to participate, in the distribution of such New Notes. Holders of Old Notes
accepting the Exchange Offer will represent to the Company in the Letter of
Transmittal that such conditions have been met. Any holder who participates in
the Exchange Offer for the purpose of participating in a distribution of the
New Notes may not rely on the position of the staff of the Commission as set
forth in these no-action letters and would have to comply with the
registration and prospectus delivery requirements of the Securities Act in
connection with any secondary resale transaction. A secondary resale
transaction in the United States by a holder who is using the Exchange Offer
to participate in the distribution of New Notes must be covered by a
registration statement containing the selling securityholder information
required by Item 507 of Regulation S-K of the Securities Act.
   
  Each broker-dealer that receives New Notes for its own account pursuant to
the Exchange Offer must acknowledge that it acquired the Old Notes as a result
of market-making activities or other trading activities and will deliver a
prospectus in connection with any resale of such New Notes. The Letter of
Transmittal states that by so acknowledging and by delivering a prospectus, a
broker-dealer will not be deemed to admit that it is an "underwriter" within
the meaning of the Securities Act. This Prospectus, as it may be amended or
supplemented from time to time, may be used by a broker-dealer in connection
with resales of New Notes received in exchange for Old Notes where such Old
Notes were acquired by such broker-dealer as a result of market-making
activities or other trading activities. The Company has agreed that, for a
period of 180 days after the Expiration Date (as defined herein), it will make
this Prospectus available to any broker-dealer for use in connection with any
such resale. See "Plan of Distribution." All broker-dealers must comply with
the registration and prospectus delivery requirements of the Securities Act in
connection with any secondary resale transaction. See "The Exchange Offer."
    
  The New Notes are new securities for which there is currently no market.
Although the Notes are eligible for trading in the Private Offerings, Resale
and Trading through Automated Linkages (PORTAL) Market of the Nasdaq Stock
Market, Inc., the Company presently does not intend to apply for listing of
the New Notes on any securities exchange or for quotation through the National
Association of Securities Dealers Automated Quotation System ("NASDAQ"). The
Company has been advised by the Initial Purchasers that, following completion
of the Exchange Offer, they presently intend to make a market in the New
Notes; however, the Initial Purchasers are not obligated to do so, and any
market-making activities with respect to the New Notes may be discontinued at
any time without notice. There can be no assurance that an active public
market for the New Notes will develop.
 
  THIS PROSPECTUS AND THE RELATED LETTER OF TRANSMITTAL CONTAIN IMPORTANT
INFORMATION. HOLDERS OF OLD NOTES ARE URGED TO READ THIS PROSPECTUS AND THE
RELATED LETTER OF TRANSMITTAL CAREFULLY BEFORE DECIDING WHETHER TO TENDER
THEIR OLD NOTES PURSUANT TO THE EXCHANGE OFFER.
 
                                       i
<PAGE>
 
  Any Old Notes not tendered and accepted in the Exchange Offer will remain
outstanding and will be entitled to all the rights and preferences and will be
subject to the limitations applicable thereto under the Indenture. Following
consummation of the Exchange Offer, the holders of Old Notes will continue to
be subject to the existing restrictions upon transfer thereof, and the Company
will have no further obligation to such holders (other than the Initial
Purchasers) to provide for the registration under the Securities Act of the
Old Notes held by them. To the extent that Old Notes are tendered and accepted
in the Exchange Offer, a holder's ability to sell untendered Old Notes could
be adversely affected. It is not expected that an active market for the Old
Notes will develop while they are subject to restrictions on transfer. The
Company will accept for exchange any and all Old Notes that are validly
tendered and not withdrawn on or prior to 5:00 p.m., New York City time, on
the date the Exchange Offer expires, which will be       , 1998 (the
"Expiration Date"), unless the Exchange Offer is extended by the Company in
its sole discretion (but in no event to a date later than       , 1998), in
which case the term "Expiration Date" shall mean the latest date and time to
which the Exchange Offer is extended. Tenders of Old Notes may be withdrawn at
any time prior to 5:00 p.m., New York City time, on the Expiration Date,
unless previously accepted for payment by the Company. The Exchange Offer is
not conditioned upon any minimum principal amount of Old Notes being tendered
for exchange. However, the Exchange Offer is subject to certain conditions
which may be waived by the Company and to the terms and provisions of the
Registration Rights Agreement. Old Notes may be tendered only in denominations
of $1,000 and integral multiples thereof. The Company has agreed to pay the
expenses of the Exchange Offer. See "The Exchange Offer--Fees and Expenses."
 
  This Prospectus, together with the Letter of Transmittal, is being sent to
all registered holders of Old Notes as of       , 1998.
 
  The Company will not receive any proceeds from this Exchange Offer. No
dealer-manager is being used in connection with this Exchange Offer. See "Use
of Proceeds" and "Plan of Distribution."
 
  UNTIL       , 1998, ALL BROKER-DEALERS EFFECTING TRANSACTIONS IN THE NEW
NOTES, WHETHER OR NOT PARTICIPATING IN THE EXCHANGE OFFER, MAY BE REQUIRED TO
DELIVER A PROSPECTUS. THIS IS IN ADDITION TO THE OBLIGATIONS OF BROKER-DEALERS
TO DELIVER A PROSPECTUS WHEN ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR
UNSOLD ALLOTMENTS OR SUBSCRIPTIONS.
 
  No broker-dealer, salesperson or other individual has been authorized to
give any information or to make any representation in connection with the
Exchange Offer other than those contained in this Prospectus and Letter of
Transmittal and, if given or made, such information or representation must not
be relied upon as having been authorized by the Company. The delivery of this
Prospectus shall not, under any circumstances, create any implication that the
information herein is correct at any time subsequent to its date.
 
  THE EXCHANGE OFFER IS NOT BEING MADE TO, NOR WILL THE COMPANY ACCEPT TENDERS
FOR EXCHANGE FROM, HOLDERS OF OLD NOTES IN ANY JURISDICTION IN WHICH THE
EXCHANGE OFFER OR THE ACCEPTANCE THEREOF WOULD NOT BE IN COMPLIANCE WITH THE
SECURITIES OR BLUE SKY LAWS OF SUCH JURISDICTION.
   
  This Prospectus includes forward-looking statements. All statements other
than statements of historical facts included in this Prospectus, including,
without limitation, the statements under "Prospectus Summary," "Management's
Discussion and Analysis of Financial Condition and Results of Operations,"
"Industry Background" and "Business" and located elsewhere herein regarding
industry prospects, the Company's prospects and the Company's financial
position are forward-looking statements. Although the Company believes that
the expectations reflected in such forward-looking statements are reasonable,
it can give no assurance that such expectations will prove to have been
correct. Important factors that could cause actual results to differ
materially from the Company's expectations ("Cautionary Statements") are
disclosed in this Prospectus, including, without limitation, in conjunction
with the forward-looking statements included in this Prospectus under "Risk
Factors." All subsequent written and oral forward-looking statements
attributable to the Company or persons acting on its behalf are expressly
qualified in their entirety by the Cautionary Statements.     
 
                                      ii
<PAGE>
 
                             AVAILABLE INFORMATION
 
  The Company has filed with the Commission a Registration Statement on Form
S-4 under the Securities Act with respect to the New Notes offered hereby (the
"Registration Statement"). This Prospectus, which constitutes a part of the
Registration Statement, does not contain all the information set forth in the
Registration Statement, certain parts of which have been omitted from this
Prospectus in accordance with the rules and regulations of the Commission. For
further information with respect to the Company and the New Notes offered
hereby, reference is made to the Registration Statement, including the
exhibits and schedules filed therewith. Statements made in this Prospectus
concerning the contents of any document referred to herein are not necessarily
complete. With respect to each such document filed with the Commission as an
exhibit to the Registration Statement, reference is made to the exhibit for a
more complete description of the matter involved, and each such statement
shall be deemed qualified in its entirety by such reference.
 
  As a result of the filing of the Registration Statement with the Commission,
the Company will become subject to the informational reporting requirements of
the Exchange Act and, in accordance therewith, will be required to file
reports and other information with the Commission.
 
  The Registration Statement, including the exhibits and scheduled thereto,
such reports and other information can be inspected and copied at the Public
Reference Section of the Commission at Room 1024, 450 Fifth Street, N.W.,
Judiciary Plaza, Washington, D.C. 20549 and at the regional offices of the
Commission located at 7 World Trade Center, 13th Floor, Suite 1300, New York,
New York 10048 and Suite 1400, Northwestern Atrium Center, 14th Floor, 500
West Madison Street, Chicago, Illinois 60661. Copies of such material can also
be obtained at prescribed rates by writing to the Public Reference Section of
the Commission at 450 Fifth Street, N.W., Judiciary Plaza, Washington, D.C.
20549 and its public reference facilities in New York, New York and Chicago,
Illinois. The Commission also maintains a Web site that contains reports,
proxy and information statements and other information regarding registrants,
such as the Company, that file electronically with the Commission. The address
of such site is http://www.sec.gov.
 
 
  In the event the Company is not required to be subject to the reporting
requirements of the Exchange Act in the future, the Company will be required
under the Indenture, dated as of November 25, 1997 (the "Indenture"), between
the Company and United States Trust Company of New York, as trustee (the
"Trustee"), pursuant to which the Old Notes have been, and the New Notes will
be, issued, to furnish to holders of the Notes the quarterly and annual
financial information, documents and other reports that would be required to
be contained in a filing with the Commission on Forms 10-K, 10-Q and 8-K, and,
with respect to the annual information only, a report thereon by the Company's
certified public accounts, for so long as any Notes are outstanding.
 
                                      iii
<PAGE>
 
                               PROSPECTUS SUMMARY
 
  The following summary is qualified in its entirety by, and should be read in
conjunction with, the more detailed information and financial statements
included elsewhere in this Prospectus. Holders of the Old Notes and prospective
investors in the New Notes are urged to read this Prospectus in its entirety.
Unless the context otherwise indicates, the term "Company" refers to the
business conducted by Crown Castle International Corp. and its subsidiaries
(including the Crown Business), and the "Crown Business" or "Crown" refers to
the business conducted by Crown Communications, Crown Network Systems, Inc.,
Crown Mobile Systems, Inc. and their affiliates prior to their acquisition by
CCIC. In addition, the term "CTI" refers to the business conducted by Castle
Transmission Services (Holdings) Ltd and its wholly owned subsidiary, Castle
Transmission International Ltd.
 
                                  THE COMPANY
   
  The Company is a leading provider of communication sites and wireless network
services. The Company owns, operates and manages wireless transmission towers
and rooftop sites, and also provides an array of related infrastructure and
network support services to the wireless communications and radio and
television broadcasting industries. The Company's primary business focus is the
leasing of antennae space on multiple tenant towers and rooftops to a variety
of wireless communications carriers under long-term lease contracts. Supporting
its competitive position in the site rental business, the Company maintains in-
house expertise in, and offers to its customers, infrastructure and network
support services that include communication site selection and acquisition,
antennae installation, site development and construction and network design.
    
  The Company leases antennae space to its customers on its owned and managed
towers. The Company generally receives fees for installing customers' equipment
and antennae on a tower and also receives monthly rental payments from
customers payable under site rental leases that generally range in length from
three to five years. The Company's U.S. customers include such companies as
Aerial Communications, American Paging, AT&T Wireless, Bell Atlantic Mobile,
BellSouth Mobility, Motorola, Nextel, PageNet and Sprint PCS, as well as
private network operators and various federal and local government agencies,
such as the Federal Bureau of Investigation, the Internal Revenue Service and
the U.S. Postal Service.
 
  At September 30, 1997, the Company owned or managed 349 towers and 82 revenue
producing rooftop sites in the United States and Puerto Rico. The Company's
tower footprints consist of 171 owned and managed towers located in western
Pennsylvania (primarily in and around the greater Pittsburgh area), 125 owned
and managed towers located in the southwestern United States (primarily in
western Texas), 21 owned towers located in Mississippi, 14 owned towers located
on mountaintops across Puerto Rico, 14 managed towers in West Virginia and four
other owned towers located in other states across the United States. The
Company plans to enhance and expand its tower footprints by building and
acquiring multiple tenant towers in locations attractive to site rental
customers. To that end, the Company has developed, maintains and deploys for
its own use extensive network design and radio frequency engineering expertise,
as well as site selection, site acquisition and tower construction
capabilities. The Company plans to leverage such expertise and experience in
building and acquiring new towers by entering into build-out or purchase
contracts with various carriers. For example, pursuant to an agreement with
Nextel Communications, Inc. ("Nextel"), the Company has options to construct up
to 250 multiple tenant towers with Nextel as an anchor tenant along certain
interstate corridors. In addition, pursuant to this agreement, the Company has
exercised an option to purchase 50 of Nextel's existing towers clustered in
various markets, including Philadelphia, Houston, Dallas and San Antonio.
 
  The Company's 34.3%-owned affiliate, CTI, owns or has access to approximately
1,300 towers in the United Kingdom, primarily serving the U.K. broadcasting
industry. CTI's customers include such companies as the British Broadcasting
Corporation ("BBC"), Cellnet, National Transcommunications Limited ("NTL"),
Mercury One2One, Orange Personal Communications and Vodaphone Limited.
 
                                       1
<PAGE>
 
 
                              INDUSTRY BACKGROUND
 
  The Company's site rental and network services businesses serve the wireless
communications and broadcasting industries, each of which is currently
experiencing a period of significant change. The wireless communications
industry is growing rapidly as consumers become more aware of the benefits of
wireless services, current wireless technologies are used in more applications,
the cost of wireless services to consumers declines and new wireless
technologies are developed. Changes in U.S. federal regulatory policy,
including the implementation of the Telecommunications Act of 1996 (the "1996
Telecom Act"), have led to a significant number of new competitors in the
wireless communications industry through the auction of frequency spectrum for
a wide range of uses, most notably "Personal Communications Services" ("PCS").
This competition, combined with an increasing reliance on wireless
communications by consumers and businesses, has led to an increased demand for
higher quality, uninterrupted service and improved coverage, which, in turn,
has led to increased demand for communication sites as new carriers build out
their networks and existing carriers upgrade and expand their networks to
maintain their competitiveness. The Cellular Telecommunications Industry
Association ("CTIA") estimates that, as of June 30, 1997, there were 38,650
antennae sites in the United States. The Personal Communications Industry
Association ("PCIA") estimates that the wireless communications industry will
construct at least 100,000 new antennae sites over the next 10 years. The
Company believes that, as the wireless industry has become more competitive,
many carriers are dedicating their capital and operations primarily to
activities that directly contribute to subscriber growth, such as marketing and
distribution. Management believes that these carriers, therefore, may seek to
reduce costs and increase efficiency by outsourcing infrastructure network
functions such as communication site ownership, construction, management and
maintenance. Further, in order to speed new network deployment or expansion and
to generate efficiencies, carriers are increasingly co-locating transmission
equipment with that of other network operators. The need for co-location has
also been driven by regulatory restrictions and the growing trend by
municipalities to slow the proliferation of towers by requiring that towers
accommodate multiple tenants. While the wireless communications industry is
experiencing rapid growth, the broadcasting industry has been characterized by
consolidation and rationalization. This industry is currently assessing the
benefits of, and planning its strategy for, the transition from analog to
digital transmission systems, which will require enhanced broadcast
infrastructure.
 
  All of these factors have provided an opportunity for the Company to
specialize in the provision, ownership and management of communication sites,
the leasing of antennae space on such sites and the provision of related
network infrastructure and support services, such as the design of wireless and
broadcast sites and networks, the selection and acquisition of tower and
rooftop sites (including the resolution of zoning and permitting issues), the
construction of towers and the installation of antennae.
 
  Management believes that, in addition to the favorable growth and outsourcing
trends in the wireless communications industry, tower operators benefit from
several additional favorable characteristics, such as: (i) a customer base
diversified across industry segments (such as PCS, cellular, paging,
specialized mobile radio ("SMR"), enhanced specialized mobile radio ("ESMR")
and broadcasting) and across individual customers within these segments; (ii)
stable, recurring revenues as a result of the contract nature of the site
rental business; (iii) low customer churn due to the costs to a carrier
associated with reconfiguring its network; and (iv) barriers to entry as a
result of local opposition to the proliferation of towers.
 
                                       2
<PAGE>
 
 
                               BUSINESS STRATEGY
 
  The Company's objective is to become the leading global provider of
communication sites and network services to the wireless communications and
broadcasting industries. Management believes that the Company's experience in
establishing and expanding its existing tower footprints, its significant
relationships with wireless communications companies and its ability to offer
customers its in-house technical and operational expertise, uniquely position
it to take advantage of available opportunities, to increase cash flow and to
achieve its strategic goals. Key elements of the Company's strategy are to:
 
  .  INCREASE UTILIZATION OF TOWER CAPACITY. The Company seeks to take
     advantage of the operating leverage of its site rental business by
     increasing the amount of antennae space leased on its owned or managed
     communication sites. The Company believes that many of its towers have
     significant capacity available for antennae space rental and that
     increased utilization of its tower capacity can be achieved at low
     incremental cost, thereby yielding significant contribution margin. In
     addition, the Company will continue to build towers with the capacity to
     accommodate multiple tenants and both existing and emerging
     technologies.
 
  .  EXPAND TOWER FOOTPRINTS. The Company intends to enhance its existing
     tower footprints and to establish new clusters of towers in targeted
     markets, particularly those that have not yet been significantly built
     out by carriers. As the Company has demonstrated in western
     Pennsylvania, it believes that once a strategic critical mass of towers
     is established in a particular region, the Company can attract wireless
     operators by offering the advantages of well-positioned communication
     sites from a single source. The Company is pursuing this strategy
     through both the construction of new towers and the acquisition of
     existing towers. The Company's tower construction strategy is not based
     on speculative tower development but rather on the construction of
     multiple tenant towers with long-term "anchor" tenants. For example,
     pursuant to its site commitment agreement with Nextel (the "Nextel
     Agreement"), the Company has options to construct up to 250 multiple
     tenant towers with Nextel as an anchor tenant along certain interstate
     corridors. The Company may also pursue acquisitions involving towers or
     other tower companies, particularly those with the potential to create
     or augment a critical mass of clustered towers in new or existing
     markets. Pursuant to the Nextel Agreement, the Company has exercised an
     option to purchase 50 of Nextel's existing towers clustered in various
     markets, including Philadelphia, Houston, Dallas and San Antonio. See
     "Business--Significant Contracts."
 
  .  PROVIDE A FULL RANGE OF SERVICES. The Company maintains in-house
     technical and operational expertise to support the development of its
     tower footprints and to offer wireless communications carriers and
     broadcasters a portfolio of technical and operational network services.
     Management believes that the ability to offer end-to-end services (site
     selection and acquisition, antennae installation, site development and
     construction and network design) is a key competitive advantage as
     wireless communications carriers and broadcasters prefer to work with
     independent tower operators that can credibly offer the convenience and
     efficiency of complete network design and operational solutions.
     Management also believes that the Company's experience in building its
     own tower footprints, as well as its in-house expertise, differentiates
     it from many of its competitors and strengthens the Company's ability to
     attract anchor tenants to its towers.
 
  .  CAPITALIZE ON RELATIONSHIPS WITH KEY CUSTOMERS. The Company intends to
     leverage its existing strategic relationships, contracts and reputation
     for quality service to secure additional site rental, tower build-out
     and network services contracts. For example, the Company has developed
     contractual relationships with a number of regional and national
     carriers, including Aerial Communications, Bell Atlantic Mobile, Nextel
     and Sprint PCS, that provide the Company with a platform from which to
     expand into multiple markets and increase antennae space rented on its
     existing towers. In addition, the Company's customer-oriented approach,
     technical expertise and focus on quality service has
 
                                       3
<PAGE>
 
     enabled it to secure contracts such as the Bell Atlantic Agreement (as
     defined) which, as of September 30, 1997, provided the Company with
     exclusive rights to lease antennae space on 117 existing Bell Atlantic
     towers located primarily in western Pennsylvania and West Virginia. See
     "Business--Significant Contracts."
 
  .  CAPITALIZE ON CTI'S EXPERTISE AND OPPORTUNITIES. CTI, the Company's
     34.3%-owned affiliate, employs a corps of engineers and technical
     personnel who designed and built the broadcast transmission network for
     the BBC. CTI owns and operates one of the world's most established radio
     and television broadcasting networks, including both the infrastructure
     and transmission equipment located on 780 owned and 558 licensed towers.
     CTI provides analog television and radio transmission services to the
     BBC under a 10-year contract and has recently won bids to enter into
     transmission contracts to design, build and operate Digital Terrestrial
     Television ("DTT") networks for four of the six national licenses
     recently awarded in the United Kingdom. The Company intends to leverage
     its relationship with CTI to capitalize on opportunities to design,
     build, own and manage towers, networks and other infrastructure for the
     broadcasting industry in the United States and international markets. In
     addition, the Company intends to leverage its wireless expertise in the
     United States by providing wireless network services to CTI to
     capitalize on the growth of wireless communications in the United
     Kingdom.
 
  .  PURSUE GROWTH THROUGH ACQUISITIONS. The Company continually evaluates
     potential acquisitions, investments and strategic alliances. The Company
     views such transactions as a means to expand its operations within its
     existing markets and to enter new markets, including international
     opportunities. The Company's acquisition and investment criteria include
     the existence of high quality assets, capacity to add tenants,
     attractive location for wireless build-out and return on capital.
 
                                  BACKGROUND
 
  Founded in 1994, the Company acquired 127 towers located in Texas, Colorado,
New Mexico, Arizona, Oklahoma and Nevada from Pittencrieff Communications,
Inc. ("PCI") in 1995. The Company subsequently continued to build its business
through a variety of transactions, including (i) the acquisition in 1996 of
Motorola's SMR and microwave system (the "Puerto Rico System") in Puerto Rico,
which included 15 communication sites (the "Puerto Rico Acquisition"), (ii)
the purchase through a series of transactions in 1996 and 1997 of TEA Group
Incorporated ("TEA"), a leading domestic and international site acquisition
firm (the "TEA Acquisition") and (iii) the purchase in February 1997 of a
34.3% ownership interest in CTI (the "CTI Investment"). In August 1997, CCIC
enhanced its tower footprints and domestic network services offerings by
consummating the Crown Merger (as defined).
 
                               THE CROWN MERGER
 
  The Crown Merger was consummated on August 15, 1997 and was structured as an
acquisition by a subsidiary of CCIC of the assets of Crown Communications (a
proprietorship owned by Robert A. and Barbara Crown), and a merger of
subsidiaries of CCIC with and into Crown Network Systems, Inc. ("CNSI") and
Crown Mobile Systems, Inc. ("CMSI"). The acquisition of the assets of Crown
Communications and the merger of subsidiaries of CCIC with and into CNSI and
CMSI are collectively referred to herein as the "Crown Merger." The
consideration paid by CCIC for the Crown Merger consisted of $25.0 million of
cash, the issuance of a $76.2 million promissory note to Robert and Barbara
Crown (the "Seller Note"), the assumption of approximately $26.0 million of
indebtedness and the issuance of 1,465,000 shares of Class B Common Stock, par
value $.01 per share, of CCIC ("Class B Common Stock") (representing
approximately 13.2% of the fully diluted ownership of CCIC). The cash portion
of the consideration was initially funded through the private placement by
CCIC of $29.3 million of senior convertible preferred stock (the "Senior
Convertible Preferred Stock") and warrants to purchase Class B Common Stock.
On October 31, 1997, the Company repaid the Seller Note. See "--The
Refinancing."
 
                                       4
<PAGE>
 
 
  The assets acquired through the Crown Merger included 61 owned towers and
exclusive rights to lease antennae space on 147 other towers and rooftop sites,
most of which are located in and around the greater Pittsburgh area, giving the
Company a significant presence in that market. The remaining Crown
communication sites are located in other areas of Pennsylvania, West Virginia,
Kentucky, Ohio and Delaware. For the six months ended June 30, 1997, Crown had
revenues of $15.8 million. As a result of the Crown Merger, the Company
believes it is one of the largest independent owners and providers of towers
and wireless network services in the United States.
 
                                THE REFINANCING
 
  On October 31, 1997, Castle Tower Corporation ("CTC"), a wholly owned
subsidiary of CCIC, borrowed approximately $94.7 million (the "October Bank
Financing") under a Loan Agreement dated April 26, 1995, as amended on June 26,
1996, January 17, 1997, April 3, 1997 and October 31, 1997 (the "Senior Credit
Facility"). In addition, concurrently with the October Bank Financing, CCIC
privately placed an additional $36.5 million of Senior Convertible Preferred
Stock and warrants to purchase Class B Common Stock. The proceeds of the
October Bank Financing and the private placement of Senior Convertible
Preferred Stock were used to repay the Seller Note, to repay loans outstanding
under a credit agreement at Crown Communication and to pay related fees and
expenses. The October Bank Financing, the private placement of the Senior
Convertible Preferred Stock and the application of the proceeds therefrom are
collectively referred to herein as the "October Refinancing."
 
  On November 20, 1997, the Company privately placed $251.0 million principal
amount at maturity ($150,010,150 initial accreted value) of its 10 5/8% Senior
Discount Notes due 2007, yielding net proceeds to the Company of approximately
$143.7 million after deducting discounts and estimated fees and expenses (the
"Offering of the Old Notes"). The net proceeds to the Company from the Offering
of the Old Notes were used to repay substantially all outstanding indebtedness
of the Company, including the approximately $94.7 million of indebtedness
incurred under the Senior Credit Facility in connection with the October
Refinancing, and to pay related fees and expenses and are being used for
general corporate purposes. The October Refinancing, the Offering of the Old
Notes and the application of the net proceeds from the Offering of the Old
Notes, are collectively referred to herein as the "Refinancing." As of January
5, 1998, there was approximately $85.3 million of unused borrowing availability
under the Senior Credit Facility.
 
                               ------------------
 
  The Company's principal executive offices are located at 510 Bering Drive,
Suite 500, Houston, Texas 77057, telephone (713) 570-3000.
 
                                       5
<PAGE>
 
                              CORPORATE STRUCTURE
 
  The following chart illustrates (i) the organizational structure of the
Company, its two subsidiaries and its U.K. affiliate and (ii) their respective
debt obligations. See "Capitalization."
 
 
 
 
 
 
                                            LOGO
 
- --------
(a) All the capital stock of Crown Communication and its direct and indirect
    subsidiaries has been pledged to secure amounts under the Senior Credit
    Facility. In connection with such pledge, CCIC has provided a limited
    recourse guaranty of the Senior Credit Facility, limited in recourse only
    to the pledged capital stock (which does not include CTI).
(b) Following the Refinancing and the receipt of certain approvals from the
    Federal Communications Commission ("FCC"), (i) TeleStructures, Inc.
    ("TeleStructures"), formerly a wholly owned subsidiary of CCIC, became a
    wholly owned subsidiary of TEA, (ii) CTC, formerly a wholly owned
    subsidiary of CCIC, was merged with and into Crown Communication and (iii)
    TEA, CNSI and CMSI, formerly wholly owned subsidiaries of CCIC, and
    Spectrum Site Management Corporation ("Spectrum") and Castle Tower
    Corporation (PR) (as of November 21, 1997, the name of this entity was
    changed to Crown Castle International Corp. de Puerto Rico, and is referred
    to herein as "CTC (PR)"), formerly wholly owned subsidiaries of CTC, became
    wholly owned subsidiaries of Crown Communication.
(c) CTC borrowed approximately $94.7 million under the Senior Credit Facility
    on October 31, 1997. In connection with the Offering of the Old Notes, the
    Company repaid all amounts outstanding thereunder. As of January 5, 1998,
    there was approximately $85.3 million of unused borrowing availability
    under the Senior Credit Facility. See "Description of the Senior Credit
    Facility."
 
                                       6
<PAGE>
 
                               THE EXCHANGE OFFER
 
THE EXCHANGE OFFER..........  The Company is offering to exchange pursuant to
                              the Exchange Offer an aggregate principal amount
                              of up to $251,000,000 principal amount at
                              maturity of the Company's New Notes for a like
                              principal amount at maturity of the Company's Old
                              Notes. The Company will issue the New Notes on or
                              promptly after the Exchange Date. As of the date
                              of this Prospectus, $251,000,000 aggregate
                              principal amount at maturity of the Old Notes is
                              outstanding. The terms of the New Notes are
                              identical in all material respects to the terms
                              of the Old Notes for which they may be exchanged
                              pursuant to this offer, except that the New Notes
                              have been registered under the Securities Act and
                              are issued free from any covenant regarding
                              registration, including terms providing for an
                              increase in the interest rate on the Old Notes
                              upon a failure to file or have declared effective
                              an exchange offer registration statement or to
                              consummate the Exchange Offer by certain dates.
                              The New Notes will evidence the same debt as the
                              Old Notes and will be issued under and be
                              entitled to the same benefits under the Indenture
                              as the Old Notes. The issuance of the New Notes
                              and the Exchange Offer are intended to satisfy
                              certain obligations of the Company under the
                              Registration Rights Agreement. See "The Exchange
                              Offer" and "Description of the Notes."
 
YIELD AND INTEREST..........  The Accreted Value of the New Notes will be
                              calculated from the original date of issuance of
                              the Old Notes. The New Notes will accrete daily
                              at a rate of 10.625% per annum, compounded
                              semiannually, to an aggregate principal amount of
                              $251.0 million by November 15, 2002. Cash
                              interest will not accrue on the New Notes prior
                              to November 15, 2002. Thereafter, cash interest
                              on the New Notes will accrue and be payable
                              semiannually in arrears on each May 15 and
                              November 15, commencing May 15, 2003, at a rate
                              of 10.625% per annum. See "The Exchange Offer--
                              Interest on the New Notes."
 
EXPIRATION DATE.............  The Exchange Offer will expire at 5:00 p.m., New
                              York City time on   , unless extended by the
                              Company in its sole discretion (but in no event
                              to a date later than   ). See "The Exchange
                              Offer--Expiration Date; Extensions; Amendments."
 
EXCHANGE DATE...............  The date of acceptance for exchange of the Old
                              Notes and the consummation of the Exchange Offer
                              will be the first business day following the
                              Expiration Date unless extended. See "The
                              Exchange Offer--Terms of the Exchange."
 
CONDITIONS OF THE EXCHANGE    The Company's obligation to consummate the
OFFER.......................  Exchange Offer will be subject to certain
                              conditions. See "The Exchange Offer--Conditions
                              to the Exchange Offer." The Company reserves the
                              right to terminate or amend the Exchange Offer at
                              any time prior to the Expiration Date.
 
                                       7
<PAGE>
 
 
WITHDRAWAL RIGHTS...........  Tenders may be withdrawn at any time prior to
                              5:00 p.m., New York City time, on the Expiration
                              Date; otherwise, all tenders will be irrevocable.
                              See "The Exchange Offer--Withdrawal of Tenders."
 
PROCEDURES FOR TENDERING      See "The Exchange Offer--Procedures for
NOTES.......................  Tendering."
 
FEDERAL INCOME TAX            The exchange of Old Notes for New Notes pursuant
 CONSEQUENCES...............  to the Exchange Offer will not result in any
                              income, gain or loss to holders who participate
                              in the Exchange Offer or to the Company for
                              federal income tax purposes. See "Certain United
                              States Federal Income Tax Considerations."
 
RESALE......................  The Company is making the Exchange Offer in
                              reliance on the position of the staff of the
                              Commission as set forth in certain no-action
                              letters addressed to other parties in other
                              transactions. However, the Company has not sought
                              their own no-action letter, and there can be no
                              assurance that the staff of the Commission would
                              make a similar determination with respect to the
                              Exchange Offer as in such other circumstances.
                              Based on these interpretations by the staff of
                              the Commission, the Company believes that New
                              Notes issued pursuant to this Exchange Offer in
                              exchange for Old Notes may be offered for resale,
                              resold and otherwise transferred by a holder
                              thereof other than (i) a broker-dealer who
                              purchased such Old Notes directly from the
                              Company to resell pursuant to Rule 144A or any
                              other available exemption under the Securities
                              Act or (ii) a person that is an "affiliate" (as
                              defined in Rule 405 of the Securities Act) of the
                              Company without compliance with the registration
                              and prospectus delivery provisions of the
                              Securities Act, provided that such New Notes are
                              acquired in the ordinary course of such holder's
                              business and that such holder is not
                              participating, and has no arrangement or
                              understanding with any persons to participate, in
                              the distribution of such New Notes. Holders of
                              Old Notes accepting the Exchange Offer will
                              represent to the Company in the Letter of
                              Transmittal that such conditions have been met.
                              Any holder who participates in the Exchange Offer
                              for the purpose of participating in a
                              distribution of the New Notes may not rely on the
                              position of the staff of the Commission as set
                              forth in these no-action letters and would have
                              to comply with the registration and prospectus
                              delivery requirements of the Securities Act in
                              connection with any secondary resale transaction.
                              A secondary resale transaction in the United
                              States by a holder who is using the Exchange
                              Offer to participate in the distribution of New
                              Notes must be covered by a registration statement
                              containing the selling securityholder information
                              required by Item 507 of Regulation S-K of the
                              Securities Act. Each broker-dealer (other than an
                              "affiliate" of the Company) that receives New
                              Notes for its own account pursuant to the
                              Exchange Offer must acknowledge that it acquired
                              the Old Notes as the result of market-making
                              activities or other trading activities and will
                              deliver a prospectus in connection with any
                              resale of such New Notes. The Letter of
                              Transmittal states that
 
                                       8
<PAGE>
 
                              by so acknowledging and by delivering a
                              prospectus, a broker-dealer will not be deemed to
                              admit that it is an "underwriter" within the
                              meaning of the Securities Act. This Prospectus,
                              as it may be amended or supplemented from time to
                              time, may be used by a broker-dealer in
                              connection with resales of New Notes received in
                              exchange for Old Notes where such Old Notes were
                              acquired by such broker-dealer as a result of
                              market-making activities or other trading
                              activities. In addition, pursuant to Section 4(3)
                              under the Securities Act, until        ,   , all
                              dealers effecting transactions in the New Notes,
                              whether or not participating in the Exchange
                              Offer, may be required to deliver a Prospectus.
                              The Company has agreed that, for a period of 180
                              days after the date of this Prospectus, it will
                              make this Prospectus available to any broker-
                              dealer for use in connection with any such
                              resale. See "Plan of Distribution." Any broker-
                              dealer who is an affiliate of the Company may not
                              rely on such no-action letters and must comply
                              with the registration and prospectus delivery
                              requirements of the Securities Act in connection
                              with any secondary resale transaction. See "The
                              Exchange Offer--Purpose of the Exchange Offer."
REMAINING OLD NOTES.........  Holders of Old Notes who do not tender their Old
                              Notes in the Exchange Offer or whose Old Notes
                              are not accepted for exchange will continue to
                              hold such Old Notes and will be entitled to all
                              the rights and preferences, and will be subject
                              to the limitations, applicable thereto under the
                              Indenture. All untendered and tendered but
                              unaccepted Old Notes (collectively, the
                              "Remaining Old Notes") will continue to bear
                              legends restricting their transfer. In general,
                              the Old Notes may not be offered or sold, unless
                              registered under the Securities Act, except
                              pursuant to an exemption from, or in a
                              transaction not subject to, the Securities Act
                              and applicable state securities laws. To the
                              extent that the Exchange Offer is effected, the
                              trading market, if any, for Remaining Old Notes
                              could be adversely affected. See "Risk Factors--
                              Consequences of Failure to Properly Tender Old
                              Notes Pursuant to the Exchange Offer" and "The
                              Exchange Offer--Terms of the Exchange."
 
EXCHANGE AGENT..............  The exchange agent with respect to the Exchange
                              Offer is United States Trust Company of New York
                              (the "Exchange Agent"). The address and telephone
                              number of the Exchange Agent are set forth in
                              "The Exchange Offer--Exchange Agent."
 
USE OF PROCEEDS.............  There will be no proceeds to the Company from the
                              exchange pursuant to the Exchange Offer. See "Use
                              of Proceeds."
 
                                       9
<PAGE>
 
                                 THE NEW NOTES
 
Securities Offered..........  $251,000,000 in aggregate principal amount at
                              maturity of 10 5/8% Senior Discount Notes due
                              2007 (the "New Notes").
 
Maturity Date...............  November 15, 2007.
 
Yield and Interest..........  The Accreted Value of the New Notes will be
                              calculated from the original date of issuance of
                              the Old Notes. The New Notes will accrete daily
                              at a rate of 10.625% per annum, compounded
                              semiannually, to an aggregate principal amount of
                              $251.0 million by November 15, 2002. Cash
                              interest will not accrue on the New Notes prior
                              to November 15, 2002. Thereafter, cash interest
                              on the New Notes will accrue and be payable
                              semiannually in arrears on each May 15 and
                              November 15, commencing May 15, 2003, at a rate
                              of 10.625% per annum.
 
Original Issue Discount.....  The Old Notes were issued at a substantial
                              discount to their principal amount, and were sold
                              to investors at a price that yielded gross
                              proceeds to the Company of approximately $150.0
                              million. The Old Notes were offered at an
                              original issue discount for U.S. federal income
                              tax purposes. Thus, although cash interest will
                              not be payable on the New Notes prior to May 15,
                              2003, original issue discount will accrue from
                              the issue date of the New Notes and will be
                              included as interest income periodically
                              (including for periods ending prior to May 15,
                              2003) in a holder's gross income for U.S. federal
                              income tax purposes in advance of receipt of the
                              cash payments to which the income is
                              attributable.
 
Optional Redemption.........  Except as described below, the New Notes will not
                              be redeemable at CCIC's option prior to November
                              15, 2002. Thereafter, the New Notes will be
                              subject to redemption at any time at the option
                              of CCIC, in whole or in part, at the redemption
                              prices set forth herein plus accrued and unpaid
                              interest and Liquidated Damages thereon, if any,
                              to the applicable redemption date. In addition,
                              at any time prior to November 15, 2000, CCIC may
                              on any one or more occasions redeem up to 35% of
                              the original aggregate principal amount at
                              maturity of the New Notes at a redemption price
                              of 110.625% of the Accreted Value thereof, plus
                              Liquidated Damages thereon, if any, to the
                              redemption date, with the net cash proceeds from
                              one or more Public Equity Offerings or Strategic
                              Equity Investments; provided that at least 65% of
                              the original aggregate principal amount at
                              maturity of the New Notes remains outstanding
                              immediately after the occurrence of such
                              redemption (excluding New Notes held by the
                              Company or any of its subsidiaries). See
                              "Description of the Notes--Optional Redemption."
 
Ranking.....................  The New Notes will be general unsecured
                              obligations of CCIC, ranking pari passu in right
                              of payment with all future senior indebtedness of
                              CCIC, and senior in right of payment to all
                              future subordinated indebtedness of CCIC.
                              However, the New Notes will
 
                                       10
<PAGE>
 
                                 
                              be effectively junior to all future secured
                              indebtedness of CCIC to the extent of the assets
                              securing such indebtedness. CCIC is a holding
                              company whose only significant asset is the
                              capital stock of its subsidiaries and its
                              investment in CTI. The New Notes will not be
                              guaranteed by such subsidiaries or by CTI.
                              Accordingly, the New Notes will be structurally
                              subordinated to all indebtedness and other
                              liabilities (including trade payables) of CCIC's
                              subsidiaries, including all borrowings under the
                              Senior Credit Facility. As of September 30, 1997,
                              after giving pro forma effect to the Refinancing,
                              CCIC would have had approximately $150.0 million
                              of outstanding indebtedness, and CCIC's
                              subsidiaries would have had no indebtedness
                              outstanding and approximately $7.0 million of
                              other outstanding liabilities. As of January 5,
                              1998, CCIC's principal operating subsidiary,
                              Crown Communication, had indebtedness amounting
                              to approximately $4.7 million, representing
                              borrowings under the Senior Credit Facility, and
                              unused borrowing availability under the Senior
                              Credit Facility of approximately $93.6 million.
                              CCIC has provided a limited recourse guaranty of
                              the Senior Credit Facility, limited in recourse
                              only to the capital stock of CCIC's subsidiaries
                              (but not including CTI). CCIC currently has no
                              secured indebtedness.     
 
Change of Control...........     
                              Upon the occurrence of a Change of Control, the
                              holders of the New Notes will have the right to
                              require CCIC to repurchase such holders' New
                              Notes, in whole or in part, at a price equal to
                              101% of the Accreted Value thereof, plus
                              Liquidated Damages thereon, if any, to the date
                              of purchase prior to November 15, 2002 or 101% of
                              the principal amount thereof, plus accrued and
                              unpaid interest and Liquidated Damages thereon,
                              if any, to the date of purchase on or after
                              November 15, 2002. The occurrence of a Change in
                              Control would result in a default under the
                              Senior Credit Facility, and any amounts owed
                              thereunder must be paid prior to CCIC's
                              obligations to the holder of the New Notes. There
                              can be no assurance that sufficient funds will be
                              available under circumstances that would require
                              CCIC to repurchase the New Notes. See
                              "Description of the Notes--Repurchase at the
                              Option of Holders--Change of Control."     
 
Certain Covenants...........  The Indenture pursuant to which the New Notes
                              will be issued contains certain covenants that,
                              among other things, limit the ability of CCIC and
                              its Restricted Subsidiaries (as defined) to (i)
                              incur additional indebtedness and issue preferred
                              stock, (ii) pay dividends or make certain other
                              restricted payments, (iii) enter into
                              transactions with affiliates, (iv) make certain
                              asset dispositions, (v) merge or consolidate
                              with, or transfer substantially all its assets
                              to, another Person (as defined), (vi) create
                              Liens (as defined), (vii) issue or sell Equity
                              Interests (as defined) of CCIC's Restricted
                              Subsidiaries, (viii) engage in sale and leaseback
                              transactions or (ix) engage in certain business
                              activities. See "Description of the Notes--
                              Certain Covenants." In addition, under certain
                              circumstances, CCIC will be required to offer to
                              purchase the New Notes at a price equal to 100%
                              of the Accreted Value thereof, plus Liquidated
 
                                       11
<PAGE>
 
                              Damages thereon, if any, if such circumstances
                              occur prior to November 15, 2002, or equal to
                              100% of the principal amount thereof, plus
                              accrued and unpaid interest and Liquidated
                              Damages thereon, if any, to the date of purchase
                              if such circumstances occur on or after November
                              15, 2002, with the proceeds of certain Asset
                              Sales (as defined). See "Description of the
                              Notes--Repurchase at the Option of Holders--Asset
                              Sales." CTI is not a subsidiary of the Company
                              and is not, therefore, subject to the provisions
                              of the Indenture.
 
                                  RISK FACTORS
 
  For a discussion of certain factors that should be considered in connection
with an investment in the Notes, see "Risk Factors."
 
                                       12
<PAGE>
 
              SUMMARY UNAUDITED PRO FORMA FINANCIAL AND OTHER DATA
 
  The unaudited pro forma financial and other data set forth below have been
derived from the Pro Forma Financial Statements (as defined) included elsewhere
in this Prospectus. The pro forma statement of operations data and other data
for the year ended December 31, 1996 and the nine months ended September 30,
1996, give effect to the Transactions (as defined under "Unaudited Pro Forma
Condensed Consolidated Financial Statements") as if they had occurred on
January 1, 1996, and the pro forma statement of operations data and other data
for the nine months ended September 30, 1997, give effect to those of the
Transactions occurring after December 31, 1996 as if they had occurred on
January 1, 1997. The pro forma balance sheet data give effect to the
Refinancing as if it had occurred on September 30, 1997. The information set
forth below should be read in conjunction with "Unaudited Pro Forma Condensed
Consolidated Financial Statements," "Selected Financial and Other Data of
CCIC," "Selected Financial and Other Data of Crown," "Management's Discussion
and Analysis of Financial Condition and Results of Operations" and the
consolidated financial statements of CCIC and Crown included elsewhere in this
Prospectus.
 
<TABLE>   
<CAPTION>
                                              YEAR ENDED  NINE MONTHS ENDED
                                             DECEMBER 31,   SEPTEMBER 30,
                                             ------------ -------------------
                                                 1996       1996      1997
                                             ------------ --------  ---------
                                                 (DOLLARS IN THOUSANDS)
<S>                                          <C>          <C>       <C>
STATEMENT OF OPERATIONS DATA:(A)
Net revenues:
 Site rental................................   $ 11,356   $  8,256  $  11,293
 Network services and other.................     34,124     22,881     32,399
                                               --------   --------  ---------
   Total net revenues.......................     45,480     31,137     43,692
                                               --------   --------  ---------
Costs of operations:
 Site rental................................      3,206      2,297      2,843
 Network services and other.................     23,276     16,506     19,356
                                               --------   --------  ---------
   Total costs of operations................     26,482     18,803     22,199
                                               --------   --------  ---------
General and administrative..................      7,263      5,010      8,271
Corporate development(b)....................      1,324        716      2,430
Depreciation and amortization...............     11,879      8,789      9,524
                                               --------   --------  ---------
Operating income (loss).....................     (1,468)  $ (2,181)     1,268
                                                          ========
Equity in losses of unconsolidated               
 affiliate..................................     (1,021)               (1,325)
Interest and other income...................        143                   424
Interest expense and amortization of            
 deferred financing costs...................    (18,006)              (13,314)
                                               --------             ---------
Income (loss) before income taxes...........    (20,352)              (12,947)
Provision for income taxes..................         (2)                  (47)
                                               --------             ---------
Net income (loss)...........................   $(20,354)            $ (12,994)
                                               ========             =========
OTHER DATA:
Site data (at period end):(c)
 Towers owned...............................        208        205        215
 Towers managed.............................        134        132        134
 Rooftop sites managed (revenue
  producing)(d).............................         68         64         82
                                               --------   --------  ---------
   Total sites owned and managed............        410        401        431
                                               ========   ========  =========
EBITDA(e)...................................   $ 10,411   $  6,608  $  10,792
Capital expenditures........................      9,709      6,184     17,756
Summary cash flow information:
 Net cash provided by operating                  
  activities................................     10,613                 7,136
</TABLE>    
 
                                       13
<PAGE>
 
<TABLE>
<CAPTION>
                                                          TWELVE MONTHS ENDED
                                                           SEPTEMBER 30, 1997
                                                        ------------------------
                                                         (DOLLARS IN THOUSANDS)
<S>                                                     <C>
EBITDA(e)..............................................         $ 14,595
Adjusted EBITDA(e).....................................           16,075
Ratio of EBITDA to total interest expense(f)...........             0.81x
Ratio of total debt to Adjusted EBITDA ................             9.33x
Ratio of total debt to EBITDA .........................            10.28x
Ratio of earnings to fixed charges(g)..................              --
<CAPTION>
                                                        AS OF SEPTEMBER 30, 1997
                                                        ------------------------
                                                         (DOLLARS IN THOUSANDS)
<S>                                                     <C>
BALANCE SHEET DATA:
Cash and cash equivalents..............................         $ 60,321
Property and equipment, net............................           69,855
Total assets...........................................          363,196
Total debt.............................................          150,010
Redeemable preferred stock(h)..........................          159,012
Total stockholders' equity.............................           46,670
</TABLE>
- --------
(a) The Company has provided a "combined results of operations" discussion of
    CCIC, Crown and certain other acquired businesses under "Management's
    Discussion and Analysis of Financial Condition and Results of Operations--
    Unaudited Supplemental Combined Adjusted Results of Operations."
(b) Corporate development expenses represent costs incurred in connection with
    acquisitions and development of new business initiatives. These expenses
    consist primarily of allocated compensation, benefits and overhead costs
    that are not directly related to the administration or management of
    existing towers.
(c) Represents the aggregate number of sites of CCIC and its acquired
    businesses (including Crown) as of the end of each period.
   
(d) As of September 30, 1997, the Company had contracts with 1,438 buildings to
    manage on behalf of such buildings the leasing of space for antennae on the
    rooftops of such buildings. A revenue producing rooftop represents a
    rooftop where the Company has arranged a lease of space on such rooftop
    and, as such, is receiving payments in respect of its management contract.
    The Company generally does not receive any payment for rooftops under
    management unless the Company actually leases space on such rooftops to
    third parties. As of September 30, 1997, the Company had 1,356 rooftop
    sites under management throughout the United States that were not revenue
    producing rooftops but were available for leasing to customers.     
   
(e) EBITDA is defined as operating income (loss) plus depreciation and
    amortization. EBITDA and Adjusted EBITDA are presented as additional
    information because management believes them to be a useful indicator of
    the Company's ability to meet debt service and capital expenditure
    requirements and because certain debt covenants of the Company utilize
    Adjusted EBITDA to measure compliance with such covenants. They are not,
    however, intended as alternative measures of operating results or cash flow
    from operations (as determined in accordance with generally accepted
    accounting principles). Furthermore, the Company's measure of EBITDA may
    not be comparable to similarly titled measures of other companies. Adjusted
    EBITDA is defined as the sum of (i) annualized site rental EBITDA before
    corporate development for the most recent calendar quarter and (ii) EBITDA,
    less site rental EBITDA before corporate development, for the most recent
    four calendar quarters.     
(f) Total interest expense includes amortization of deferred financing costs of
    $959.
(g) For purposes of computing the ratio of earnings to fixed charges, earnings
    represent net income (loss) before income taxes, fixed charges and equity
    in losses of unconsolidated affiliate. Fixed charges consist of interest
    expense, the interest component of operating leases and amortization of
    deferred financing costs. For the twelve months ended September 30, 1997,
    earnings were insufficient to cover fixed charges by $15,470.
(h) Represents (i) the Senior Convertible Preferred Stock privately placed by
    CCIC in August 1997 and October 1997, which is mandatorily redeemable upon
    the earlier of (A) 91 days after the tenth anniversary date of the issuance
    of the Notes or (B) May 15, 2008 and (ii) the Series A Convertible
    Preferred Stock, the Series B Convertible Preferred Stock, and the Series C
    Convertible Preferred Stock (each as defined) privately placed by CCIC in
    April 1995, July 1996 and February 1997, respectively, all of which are
    redeemable at the option of the holder beginning on the same date upon
    which the Senior Convertible Preferred Stock is mandatorily redeemable.
 
                                       14
<PAGE>
 
                    SUMMARY FINANCIAL AND OTHER DATA OF CCIC
 
  The summary historical consolidated financial data for CCIC presented below
for each of the two years in the period ended December 31, 1996, and as of
December 31, 1995 and 1996, have been derived from the consolidated financial
statements of CCIC, which have been audited by KPMG Peat Marwick LLP,
independent certified public accountants. The summary historical consolidated
financial data for each of the nine-month periods ended September 30, 1996 and
1997, and as of September 30, 1997, have been derived from unaudited
consolidated financial statements of CCIC which, in the opinion of management,
include all adjustments (consisting of normal recurring items) necessary for a
fair and consistent presentation of such data. The information set forth below
should be read in conjunction with "Management's Discussion and Analysis of
Financial Condition and Results of Operations--Results of Operations--The
Company" and the consolidated financial statements of CCIC included elsewhere
in this Prospectus.
 
<TABLE>   
<CAPTION>
                                                               NINE MONTHS
                                              YEARS ENDED         ENDED
                                             DECEMBER 31,     SEPTEMBER 30,
                                             --------------  ----------------
                                              1995    1996    1996     1997
                                             ------  ------  ------  --------
                                                (DOLLARS IN THOUSANDS)
<S>                                          <C>     <C>     <C>     <C>
STATEMENT OF OPERATIONS DATA:
Net revenues:
 Site rental................................ $4,052  $5,615  $4,001  $  6,743
 Network services and other(a)..............      6     592     304    12,668
                                             ------  ------  ------  --------
   Total net revenues.......................  4,058   6,207   4,305    19,411
                                             ------  ------  ------  --------
Costs of operations:
 Site rental................................  1,226   1,292     937     1,422
 Network services and other.................    --        8     --      7,187
                                             ------  ------  ------  --------
   Total costs of operations................  1,226   1,300     937     8,609
                                             ------  ------  ------  --------
General and administrative..................    729   1,678   1,211     3,841
Corporate development(b)....................    204   1,324     716     4,654
Depreciation and amortization...............    836   1,242     868     3,295
                                             ------  ------  ------  --------
Operating income (loss).....................  1,063     663     573      (988)
Equity in losses of unconsolidated              --      --      --     (1,189)
 affiliate..................................
Interest and other income...................     53     193     101       441
Interest expense and amortization of         (1,137) (1,803) (1,229)   (4,368)
 deferred financing costs...................
                                             ------  ------  ------  --------
Income (loss) before income taxes...........    (21)   (947)   (555)   (6,104)
Provision for income taxes..................    --      (10)    --        (46)
                                             ------  ------  ------  --------
Net income (loss)........................... $  (21) $ (957) $ (555) $ (6,150)
                                             ======  ======  ======  ========
OTHER DATA:
Site data (at period end):(c)
 Towers owned...............................    126     155     154       215
 Towers managed.............................      7       7       7       134
 Rooftop sites managed (revenue                  41      52      49        82
  producing)(d).............................
                                             ------  ------  ------  --------
   Total sites owned and managed............    174     214     210       431
                                             ======  ======  ======  ========
</TABLE>    
 
                                       15
<PAGE>
 
<TABLE>   
<CAPTION>
                                                               NINE MONTHS
                                             YEARS ENDED          ENDED
                                            DECEMBER 31,      SEPTEMBER 30,
                                           ----------------  -----------------
                                            1995     1996     1996      1997
                                           -------  -------  -------  --------
                                                (DOLLARS IN THOUSANDS)
<S>                                        <C>      <C>      <C>      <C>
EBITDA(e)................................. $ 1,899  $ 1,905  $ 1,441  $  2,307
Capital expenditures......................     161      890      595     5,295
Summary cash flow information:
 Net cash provided by (used for) operating   1,672     (530)     649    (2,061)
  activities..............................
 Net cash used for investing activities... (16,673) (13,916) (13,196)  (97,242)
 Net cash provided by financing             15,597   21,193   21,068   105,055
  activities..............................
Ratio of earnings to fixed charges(f) ....     --       --       --        --
<CAPTION>
<S>                                        <C>      <C>      <C>      <C>
BALANCE SHEET DATA (AT PERIOD END):
Cash and cash equivalents................. $   596  $ 7,343           $ 13,095
Property and equipment, net...............  16,003   26,753             69,855
Total assets..............................  19,875   41,226            308,395
Total debt................................  11,182   22,052            129,781
Redeemable preferred stock(g).............   5,175   15,550            122,562
Total stockholders' equity (deficit)......     619     (210)            47,620
</TABLE>    
- --------
(a) Includes a $1.2 million fee received in March 1997 as compensation for
    leading the investment consortium which provided the equity financing for
    CTI in connection with the CTI Investment.
 
(b) Corporate development expenses represent costs incurred in connection with
    acquisitions and development of new business initiatives. These expenses
    consist primarily of allocated compensation, benefits and overhead costs
    that are not directly related to the administration or management of
    existing towers. For the nine-month period ended September 30, 1997,
    includes (i) nonrecurring cash bonuses of $913 paid to certain executive
    officers in connection with the CTI Investment and (ii) a nonrecurring cash
    charge of $1,311 related to the purchase by CCIC of shares of Class B
    Common Stock from CCIC's former chief executive officer in connection with
    the CTI Investment. See "Certain Relationships and Related Transactions."
 
(c) Represents the aggregate number of sites of CCIC as of the end of each
    period.
   
(d) As of September 30, 1997, the Company had contracts with 1,438 buildings to
    manage on behalf of such buildings the leasing of space for antennae on the
    rooftops of such buildings. A revenue producing rooftop represents a
    rooftop where the Company has arranged a lease of space on such rooftop
    and, as such, is receiving payments in respect of its management contract.
    The Company generally does not receive any payment for rooftops under
    management unless the Company actually leases space on such rooftops to
    third parties. As of September 30, 1997, the Company had 1,356 rooftop
    sites under management throughout the United States that were not revenue
    producing rooftops but were available for leasing to customers.     
          
(e) EBITDA is defined as operating income (loss) plus depreciation and
    amortization. EBITDA is presented as additional information because
    management believes it to be a useful indicator of the Company's ability to
    meet debt service and capital expenditure requirements. It is not, however,
    intended as an alternative measure of operating results or cash flow from
    operations (as determined in accordance with generally accepted accounting
    principles). Furthermore, the Company's measure of EBITDA may not be
    comparable to similarly titled measures of other companies.     
 
(f) For purposes of computing the ratio of earnings to fixed charges, earnings
    represent net income (loss) before income taxes, fixed charges and equity
    in losses of unconsolidated affiliate. Fixed charges consist of interest
    expense, the interest component of operating leases and amortization of
    deferred financing costs. For the years ended December 31, 1995 and 1996,
    and the nine months ended September 30, 1996 and 1997, earnings were
    insufficient to cover fixed charges by $21, $947, $555 and $4,915,
    respectively.
 
(g) Represents (i) the Senior Convertible Preferred Stock privately placed by
    CCIC in August 1997 and October 1997, which is mandatorily redeemable upon
    the earlier of (A) 91 days after the tenth anniversary date of the issuance
    of the Notes or (B) May 15, 2008 and (ii) the Series A Convertible
    Preferred Stock, the Series B Convertible Preferred Stock, and the Series C
    Convertible Preferred Stock privately placed by CCIC in April 1995, July
    1996 and February 1997, respectively, all of which are redeemable at the
    option of the holder beginning on the same date upon which the Senior
    Convertible Preferred Stock is mandatorily redeemable.
 
                                       16
<PAGE>
 
                   SUMMARY FINANCIAL AND OTHER DATA OF CROWN
 
  The summary historical combined financial data for Crown presented below for
each of the two years in the period ended December 31, 1996, and as of December
31, 1995 and 1996, have been derived from the combined financial statements of
Crown, which have been audited by KPMG Peat Marwick LLP, independent certified
public accountants. The summary historical combined financial data for each of
the six-month periods ended June 30, 1996 and 1997, and as of June 30, 1997,
have been derived from unaudited combined financial statements of Crown which,
in the opinion of Crown's management, include all adjustments (consisting of
normal recurring items) necessary for a fair and consistent presentation of
such data. Crown was acquired by CCIC in the Crown Merger in August 1997 and,
as a result, nine-month historical financial data for Crown is not presented.
The information set forth below should be read in conjunction with
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Results of Operations--Crown" and the combined financial statements
of Crown included elsewhere in this Prospectus.
<TABLE>   
<CAPTION>
                                              YEARS ENDED     SIX MONTHS ENDED
                                             DECEMBER 31,         JUNE 30,
                                            ----------------  -----------------
                                             1995     1996     1996      1997
                                            -------  -------  -------- --------
                                                 (DOLLARS IN THOUSANDS)
<S>                                         <C>      <C>      <C>      <C>
STATEMENT OF OPERATIONS DATA:
Net revenues:
 Site rental..............................  $ 3,632  $ 5,120  $ 2,239  $  3,815
 Network services and other...............    7,384   14,260    5,950    12,022
                                            -------  -------  -------  --------
   Total net revenues.....................   11,016   19,380    8,189    15,837
                                            -------  -------  -------  --------
Costs of operations:
 Site rental..............................      763    1,691      600     1,150
 Network services and other...............    3,944    8,632    3,877     5,138
                                            -------  -------  -------  --------
   Total costs of operations..............    4,707   10,323    4,477     6,288
                                            -------  -------  -------  --------
General and administrative................    2,625    3,150    1,163     3,163
Depreciation and amortization.............      568    1,168      452       842
                                            -------  -------  -------  --------
Operating income..........................    3,116    4,739    2,097     5,544
Interest and other income (expense).......       19      (53)      (8)      (29)
Interest expense..........................     (785)  (1,175)    (526)     (774)
                                            -------  -------  -------  --------
Income before income taxes................    2,350    3,511    1,563     4,741
Provision for income taxes................      --       --       --        --
                                            -------  -------  -------  --------
Net income................................  $ 2,350  $ 3,511  $ 1,563  $  4,741
                                            =======  =======  =======  ========
OTHER DATA:
Site data (at period end):(a)
 Towers owned.............................       45       53       50        54
 Towers managed...........................      122      127      125       127
 Rooftop sites managed (revenue                   9       16       15        20
  producing)..............................
                                            -------  -------  -------  --------
   Total sites owned and managed..........      176      196      190       201
                                            =======  =======  =======  ========
EBITDA:(b)
 Site rental..............................  $ 2,589  $ 3,098  $ 1,534  $  2,513
 Network services and other...............    1,095    2,809    1,015     3,873
                                            -------  -------  -------  --------
   Total..................................  $ 3,684  $ 5,907  $ 2,549  $  6,386
                                            =======  =======  =======  ========
EBITDA as a percentage of net revenues:(b)
 Site rental..............................     71.3%    60.5%    68.5%     65.9%
 Network services and other...............     14.8%    19.7%    17.1%     32.2%
   Total..................................     33.4%    30.5%    31.1%     40.3%
Capital expenditures......................  $ 5,670  $ 8,658  $ 2,378  $ 10,678
Summary cash flow information:
 Net cash provided by operating
  activities..............................    2,974    4,162      118     6,394
 Net cash used for investing activities...   (5,670)  (8,652)  (3,178)  (10,678)
 Net cash provided by financing
  activities..............................    2,367    4,100    2,544     4,634
Ratio of earnings to fixed charges(c).....                                 5.63x
BALANCE SHEET DATA (AT PERIOD END):
Cash and cash equivalents.................  $   764  $   374           $    724
Property and equipment, net...............   13,877   21,362             31,047
Total assets..............................   16,014   25,589             37,363
Total debt................................   10,575   17,381             23,625
Total owners' equity......................    3,506    4,311              7,520
</TABLE>    
- -------
(a) Represents the aggregate number of sites of Crown as of the end of each
    period.
   
(b) EBITDA is defined as operating income plus depreciation and amortization.
    EBITDA is presented as additional information because management believes
    it to be a useful indicator of a company's ability to meet debt service and
    capital expenditure requirements. It is not, however, intended as an
    alternative measure of operating results or cash flow from operations (as
    determined in accordance with generally accepted accounting principles).
    Furthermore, Crown's measure of EBITDA may not be comparable to similarly
    titled measures of other companies.     
(c) For purposes of computing the ratio of earnings to fixed charges, earnings
    represent net income before income taxes and fixed charges. Fixed charges
    consist of interest expense, the interest component of operating leases and
    amortization of deferred financing costs.
 
                                       17
<PAGE>
 
                    SUMMARY FINANCIAL AND OTHER DATA OF CTI
 
  The summary historical financial data for CTI, which is 34.3% owned by CCIC,
presents (i) summary historical financial data of the Home Service Transmission
business of the BBC prior to its acquisition by CTI (the "Predecessor") for the
year ended March 31, 1996 and the eleven months ended February 27, 1997, (ii)
summary historical consolidated financial data of CTI after such acquisition
for the one month ended March 31, 1997 and (iii) summary historical
consolidated financial data of CTI as of and for the six months ended September
30, 1997. The historical financial data for the year ended March 31, 1996 and
the eleven months ended February 27, 1997 have been derived from the audited
financial statements of the Predecessor. The summary financial data for the one
month ended March 31, 1997 has been derived from the audited consolidated
financial statements of CTI, which have been audited by KPMG, Chartered
Accountants. The results of operations for the one month ended March 31, 1997
and the six months ended September 30, 1997 are not necessarily indicative of
the results of operations of CTI for the full year. This information reflects
financial data for CTI as a whole, is not limited to that portion of the
financial data attributable to CCIC's percentage ownership of CTI and is not
indicative of any distributions or dividends that CCIC might receive in the
future. CTI is subject to significant restrictions on its ability to make
dividends and distribution to CCIC. See "Risk Factors--Relationship with
Minority Owned Affiliate; Potential Conflicts of Interests." The information
set forth below should be read in conjunction with the consolidated financial
statements of CTI included elsewhere in this Prospectus.
 
<TABLE>   
<CAPTION>
                                                                                      PREDECESSOR
                        PREDECESSOR COMPANY                       CTI                   COMPANY              CTI
                  ---------------------------------  -------------------------------  ------------ -----------------------
                                    ELEVEN MONTHS         ONE          SIX MONTHS        ELEVEN    ONE MONTH  SIX MONTHS
                    YEAR ENDED          ENDED         MONTH ENDED         ENDED       MONTHS ENDED   ENDED       ENDED
                     MARCH 31,       FEBRUARY 27,      MARCH 31,      SEPTEMBER 30,   FEBRUARY 27, MARCH 31, SEPTEMBER 30,
                       1996              1997             1997            1997          1997(A)     1997(A)     1997(A)
                  ---------------  ----------------  --------------  ---------------  ------------ --------- -------------
                                  (POUNDS STERLING IN THOUSANDS)                            (U.S. DOLLARS IN THOUSANDS)
<S>               <C>              <C>               <C>             <C>              <C>          <C>       <C>           <C>
STATEMENT OF
 OPERATIONS
 DATA:
Net revenues....  (Pounds) 70,367  (Pounds)  70,614  (Pounds) 6,433  (Pounds) 37,400    $114,289    $10,412     $60,532
Operating
 expenses.......           62,582            56,612           5,188           31,571      91,627      8,397      51,098
                  ---------------  ----------------  --------------  ---------------    --------    -------     -------
Operating
 income.........            7,785            14,002           1,245            5,829      22,662      2,015       9,434
Interest and
 other income
 (expense)......              --                --               49              198         --          79         320
Interest expense
 and
 amortization of
 deferred
 financing
 costs..........              --                --             (969)          (8,909)        --      (1,568)    (14,419)
                  ---------------  ----------------  --------------  ---------------    --------    -------     -------
Income (loss)
 before income
 taxes..........            7,785            14,002             325           (2,882)     22,662        526      (4,665)
Provision for
 income taxes...              --                --              --               --          --         --          --
                  ---------------  ----------------  --------------  ---------------    --------    -------     -------
Net income
 (loss) under
 U.K. GAAP......            7,785            14,002             325           (2,882)     22,662        526      (4,665)
Adjustments to
 convert to U.S.
 GAAP...........            3,707             3,993              78              320       6,463        126         518
                  ---------------  ----------------  --------------  ---------------    --------    -------     -------
Net income
 (loss) under
 U.S. GAAP......   (Pounds)11,492    (Pounds)17,995     (Pounds)403   (Pounds)(2,562)   $ 29,125    $   652     $(4,147)
                  ===============  ================  ==============  ===============    ========    =======     =======
OTHER DATA:
EBITDA..........  (Pounds) 20,620  (Pounds)  27,040  (Pounds) 3,064  (Pounds) 17,062    $ 43,764    $ 4,959     $27,615
Capital
 expenditures
 (under U.S.
 GAAP)..........           18,079            21,810             748            8,863      35,299      1,211      14,345
Summary cash flow information
 (under U.S. GAAP):
Net cash
 provided by
 operating
 activities.....           24,311            28,146           4,871           15,728      45,554      7,884      25,456
Net cash used
 for investing
 activities.....          (17,190)          (21,811)        (52,889)          (9,193)    (35,301)   (85,601)    (14,879)
Net cash
 provided by
 (used for)
 financing
 activities.....           (7,121)           (6,335)         57,706          (12,411)    (10,253)    93,397     (20,087)
</TABLE>    
 
<TABLE>   
<CAPTION>
                            AS OF SEPTEMBER 30, 1997     AS OF SEPTEMBER 30, 1997
                         ------------------------------ ---------------------------
                         (POUNDS STERLING IN THOUSANDS) (U.S. DOLLARS IN THOUSANDS)
<S>                      <C>                            <C>
BALANCE SHEET DATA
 (under U.S. GAAP):
Cash and cash
 equivalents............         (Pounds) 3,812                  $  6,170
Property and equipment,
 net....................                205,367                   332,386
Total assets............                266,293                   430,995
Total debt..............                164,135                   265,652
Redeemable preference
 shares.................                105,021                   169,976
Ordinary shareholders'
 equity (deficit).......                 (4,282)                   (6,930)
</TABLE>    
- -------
   
(a) CTI publishes its consolidated financial statements in pounds sterling. In
    this Prospectus, references to "pounds sterling" or "(Pounds)" are to U.K.
    currency and references to "U.S. dollars," "U.S.$" or "$" are to U.S.
    currency. For the convenience of the reader, the information set forth
    above, as well as certain other information with respect to CTI included in
    this Prospectus, contains translations of pound sterling amounts into U.S.
    dollars at the rate quoted at 4 p.m. Eastern time by Dow Jones and other
    sources as published in The Wall Street Journal for pounds sterling (the
    "Exchange Rate") on September 30, 1997, of (Pounds)1.00 = $1.6185. No
    representation is made that the pound sterling amounts have been, could
    have been or could be converted into U.S. dollars at the rates indicated or
    any other rates. On October 31, 1997, the Exchange Rate was (Pounds)1.00 =
    $1.6743.     
 
                                       18
<PAGE>
 
                                 RISK FACTORS
 
  Prospective investors should consider carefully the risk factors set forth
below, as well as the other information appearing in this Prospectus, before
making any investment in the New Notes.
 
CONSEQUENCES OF FAILURE TO PROPERLY TENDER OLD NOTES PURSUANT TO THE EXCHANGE
OFFER
 
  Holders of Old Notes who do not exchange their Old Notes for New Notes
pursuant to the Exchange Offer will continue to be subject to the following
restrictions on transfer with respect to their Old Notes: (i) the Remaining
Old Notes may be resold only if registered pursuant to the Securities Act, if
any exemption from registration is available thereunder, or if neither such
registration nor such exemption is required by law, and (ii) the Remaining Old
Notes will bear a legend restricting transfer in the absence of registration
or an exemption therefrom. The Company does not currently anticipate that they
will register the Old Notes under the Securities Act. To the extent that Old
Notes are tendered and accepted in connection with the Exchange Offer, any
trading market for remaining Old Notes could be adversely affected.
 
  Issuance of the New Notes in exchange for the Old Notes pursuant to the
Exchange Offer will be made only after timely receipt by the Exchange Agent of
such Old Notes, a properly completed and duly executed Letter of Transmittal
and all other required documents. Therefore, holders of the Old Notes desiring
to tender such Old Notes in exchange for New Notes should allow sufficient
time to ensure timely delivery. The Company is under no duty to give
notification of defects or irregularities with respect to tenders of Old Notes
for exchange. Old Notes that are not tendered or that are tendered but not
accepted by the Company for exchange, will, following consummation of the
Exchange Offer, continue to be subject to the existing restrictions upon
transfer thereof under the Securities Act and, upon consummation of the
Exchange Offer, certain registration rights under the Registration Rights
Agreement will terminate.
 
SUBSTANTIAL LEVERAGE; RESTRICTIONS IMPOSED BY THE TERMS OF THE COMPANY'S
INDEBTEDNESS
 
  The Company is highly leveraged. As of September 30, 1997, after giving pro
forma effect to the Refinancing, the Company would have had total consolidated
indebtedness of approximately $150.0 million (all of which would have
consisted of the Old Notes), total redeemable preferred stock of $159.0
million and total stockholders' equity of approximately $46.7 million. Also,
after giving pro forma effect to the Transactions, the Company's earnings
would have been insufficient to cover fixed charges by $19.3 million for
fiscal 1996 and by $11.6 million for the nine months ended September 30, 1997.
CCIC and its subsidiaries will be permitted to incur additional indebtedness
in the future. See "Capitalization," "Management's Discussion and Analysis of
Financial Condition and Results of Operations--Liquidity and Capital
Resources," "Description of the Senior Credit Facility" and "Description of
the Notes."
 
  The degree to which the Company is leveraged has important consequences to
holders of the New Notes, including, but not limited to: (i) making it more
difficult for the Company to satisfy its obligations with respect to the
Notes, (ii) increasing the Company's vulnerability to general adverse economic
and industry conditions, (iii) limiting the Company's ability to obtain
additional financing to fund future working capital, capital expenditures and
other general corporate requirements, (iv) requiring the dedication of a
substantial portion of the Company's cash flow from operations to the payment
of principal of, and interest on, its indebtedness, thereby reducing the
availability of such cash flow to fund working capital, capital expenditures
or other general corporate purposes, (v) limiting the Company's flexibility in
planning for, or reacting to, changes in its business and the industry, and
(vi) placing the Company at a competitive disadvantage vis-a-vis less
leveraged competitors. In addition, the degree to which the Company is
leveraged could prevent it from repurchasing all of the New Notes tendered to
it upon the occurrence of a Change of Control. See "--Repurchase of the Notes
Upon a Change of Control," "Description of the Senior Credit Facility" and
"Description of the Notes--Repurchase at the Option of Holders--Change of
Control."
 
                                      19
<PAGE>
 
  The Company's ability to make scheduled payments of principal of, or to pay
interest on, its debt obligations, and its ability to refinance any such debt
obligations (including the Notes), or to fund planned capital expenditures,
will depend on its future performance, which, to a certain extent, is subject
to general economic, financial, competitive, legislative, regulatory and other
factors that are beyond its control. The Company's business strategy
contemplates substantial capital expenditures in connection with the expansion
of its tower footprints. Based on the Company's current operations and
anticipated revenue growth, management believes that cash flow from operations
and available cash, together with available borrowings under the Senior Credit
Facility, will be sufficient to fund the Company's anticipated capital
expenditures through at least 1998, including in connection with the Nextel
Agreement. Thereafter, however, or in the event the Company exceeds its
currently anticipated capital expenditures for 1998, the Company anticipates
that it will need to seek additional equity or debt financing to fund its
business plan. Failure to obtain any such financing could require the Company
to significantly reduce its planned capital expenditures and could have a
material adverse effect on the Company's ability to achieve its business
strategy. In addition, the Company may need to refinance all or a portion of
its indebtedness (including the Notes) on or prior to its scheduled maturity.
There can be no assurance that the Company will generate sufficient cash flow
from operations in the future, that anticipated revenue growth will be
realized or that future borrowings, equity contributions or loans from
affiliates will be available in an amount sufficient to service its
indebtedness and make anticipated capital expenditures. In addition, there can
be no assurance that the Company will be able to effect any required
refinancings of its indebtedness (including the Notes) on commercially
reasonable terms or at all. See "--Holding Company Structure; Restrictions on
Access to Cash Flow of Subsidiaries" and "Management's Discussion and Analysis
of Financial Condition and Results of Operations."
 
  The Senior Credit Facility and the Indenture contain numerous restrictive
covenants, including but not limited to covenants that restrict the Company's
ability to incur indebtedness, pay dividends, create liens, sell assets and
engage in certain mergers and acquisitions. In addition, the Senior Credit
Facility requires subsidiaries of the Company to maintain certain financial
ratios. The ability of the Company to comply with the covenants and other
terms of the Senior Credit Facility and the Indenture and to satisfy its
respective debt obligations (including, without limitation, borrowings and
other obligations under the Senior Credit Facility) will depend on the future
operating performance of the Company. In the event the Company fails to comply
with the various covenants contained in the Senior Credit Facility or the
Indenture, as applicable, it would be in default thereunder, and in any such
case, the maturity of substantially all of its long-term indebtedness could be
accelerated. A default under the Indenture would also constitute an event of
default under the Senior Credit Facility. See "Description of the Senior
Credit Facility" and "Description of the Notes."
 
HOLDING COMPANY STRUCTURE; RESTRICTIONS ON ACCESS TO CASH FLOW OF SUBSIDIARIES
 
  CCIC is a holding company with no business operations of its own. CCIC's
only significant asset is the outstanding capital stock of its subsidiaries
and its 34.3%-owned affiliate, CTI. CCIC conducts all its business operations
through its subsidiaries. Accordingly, CCIC's only source of cash to pay
interest on and principal of the Notes is distributions with respect to its
ownership interest in its subsidiaries from the net earnings and cash flow
generated by such subsidiaries. Although the Notes do not require cash
interest payments until May 15, 2003, at such time the Notes will have
accreted to $251.0 million and will require annual cash interest payments of
approximately $26.7 million. In addition, the Notes mature on November 15,
2007. CCIC currently expects that the earnings and cash flow of its
subsidiaries will be retained and used by such subsidiaries in their
operations, including to service their respective debt obligations. Even if
CCIC determined to pay a dividend on or make a distribution in respect of the
capital stock of its subsidiaries, there can be no assurance that CCIC's
subsidiaries will generate sufficient cash flow to pay such a dividend or
distribute such funds to CCIC or that applicable state law and contractual
restrictions, including negative covenants contained in the debt instruments
of such subsidiaries, will permit such dividends or distributions.
Furthermore, the terms of the Senior Credit Facility place restrictions on
Crown Communication's ability to pay dividends or to make distributions, and
in any event, such dividends or distributions may only be paid if no default
has occurred under the Senior Credit Facility. In addition, CCIC's
subsidiaries will be permitted under the terms of the Indenture to incur
certain additional indebtedness that may restrict or prohibit the making of
distributions, the payment of dividends or the
 
                                      20
<PAGE>
 
making of loans by such subsidiaries to CCIC. Accordingly, CCIC does not
anticipate that it will receive any material distributions from its
subsidiaries prior to 2003, and there can be no assurance that sufficient
amounts will be available to service interest on the Notes that becomes
payable on a semiannual basis commencing in 2003. See "--Substantial Leverage;
Restrictions Imposed by the Terms of the Company's Indebtedness" and
"Description of the Senior Credit Facility."
 
  CCIC currently anticipates that, in order to pay the principal of the Notes
or to redeem or repurchase the Notes upon a Change of Control, CCIC will be
required to adopt one or more alternatives, such as refinancing its
indebtedness, selling its equity securities or the equity securities or assets
of its subsidiaries, or seeking capital contributions or loans from its
affiliates. None of the affiliates of CCIC are required to make any capital
contributions, loans or other payments to CCIC with respect to CCIC's
obligations on the Notes. There can be no assurance that any of the foregoing
actions could be effected on satisfactory terms, that any of the foregoing
actions would enable CCIC to pay the principal amount of the Notes or that any
of such actions would be permitted by the terms of the Indenture or any other
debt instruments of CCIC or CCIC's subsidiaries then in effect. See "--
Substantial Leverage; Restrictions Imposed by the Terms of the Company's
Indebtedness."
 
RANKING OF THE NOTES; STRUCTURAL SUBORDINATION
   
  The Notes represent general unsecured obligations of CCIC and rank pari
passu in right of payment with all existing and future senior indebtedness of
CCIC, if any, and senior in right of payment to all future subordinated
indebtedness of CCIC, if any. As of September 30, 1997, after giving effect to
the Refinancing, CCIC would have had no indebtedness other than the Notes (and
its limited recourse guaranty of any amounts thereafter outstanding under the
Senior Credit Facility). The Notes will not be guaranteed by CCIC's
subsidiaries. As a result, all indebtedness, including trade payables, of such
subsidiaries, including borrowings under the Senior Credit Facility, will be
structurally senior to the Notes. In addition, CCIC has provided a limited
recourse guaranty of the Senior Credit Facility (limited to the capital stock
of its subsidiaries) and has pledged the stock of its subsidiaries to secure
the borrowings under the Senior Credit Facility, and such subsidiaries have
granted liens on substantially all of their assets as security for the
obligations under the Senior Credit Facility. As of January 5, 1998, Crown
Communication, CCIC's principal operating subsidiary, had indebtedness
amounting to approximately $4.7 million, representing borrowings under the
Senior Credit Facility, unused borrowing availability under the Senior Credit
Facility of approximately $93.6 million and $11.4 million of liabilities
outstanding, all of which will be structurally senior in right of payment to
the Notes. CCIC currently has no secured indebtedness. See "Capitalization,"
"Unaudited Pro Forma Condensed Consolidated Financial Statements" and
"Description of the Senior Credit Facility."     
 
RISKS ASSOCIATED WITH CONSTRUCTION AND ACQUISITIONS OF TOWERS
 
  The Company's growth strategy depends on its ability to construct, acquire
and operate towers in conjunction with the expansion of wireless
communications carriers. As of September 30, 1997, the Company had 19 towers
under construction and had plans to commence construction on an additional 16
towers by the end of 1997. The Company's ability to construct new towers can
be affected by a number of factors beyond its control, including zoning and
local permitting requirements and Federal Aviation Administration ("FAA")
considerations, availability of construction equipment and skilled
construction personnel and bad weather conditions. In addition, as the concern
over tower proliferation has grown in recent years, certain communities have
placed restrictions on new tower construction or have delayed granting permits
required for construction. There can be no assurance that: (i) the Company
will be able to overcome the barriers to new construction; (ii) the number of
towers planned for construction will be completed in accordance with the
requirements of the Company's customers; or (iii) there will be a significant
need for the construction of new towers once the wireless communications
carriers complete their tower network infrastructure build-out. With respect
to the acquisition of towers, the Company competes with certain wireless
communications carriers, broadcasters, site developers and other independent
tower owners and operators for acquisitions of towers, and expects such
competition to increase. Increased competition for acquisitions may result in
fewer acquisition opportunities for the Company, as well as higher acquisition
prices. The Company regularly explores acquisition opportunities;
 
                                      21
<PAGE>
 
however, with the exception of the Nextel Agreement, the Company has no
agreements or understandings regarding such possible future acquisitions.
There can be no assurance that the Company will be able to identify towers or
companies to acquire in the future. In addition, the Company may need to seek
additional debt or equity financing in order to fund properties it seeks to
acquire. The availability of additional financing cannot be assured and
depending on the terms of proposed acquisitions and financing, could be
restricted by the terms of the Senior Credit Facility and the Indenture. No
assurance can be given that the Company will be able to identify, finance and
complete future acquisitions on acceptable terms or that the Company will be
able to manage profitably and market under-utilized capacity on additional
towers. The extent to which the Company is unable to construct or acquire
additional towers, or manage profitably such tower expansion, may have a
material adverse effect on the Company's financial condition and results of
operation.
 
  In addition, the timeframe for the current wireless build-out cycle may be
limited to the next few years, and many PCS networks have already been built
out in large markets. A failure by the Company to move quickly and
aggressively to obtain growth capital and capture this infrastructure
opportunity could have a material adverse effect on the Company's financial
condition and results of operations.
 
MANAGING INTEGRATION AND GROWTH
 
  The Company's ability to implement its growth strategy depends, in part, on
its successes in integrating its acquisitions, investments, joint ventures and
strategic alliances into the Company's operations. The Company has grown
significantly over the past year through acquisitions. The Crown Merger in
August 1997 was significantly larger than the Company's previous acquisitions
and represents a substantial increase in the scope of the Company's business.
Crown's revenues for fiscal 1996 were $19.4 million. In contrast, CCIC's
revenues for fiscal 1996 were $6.2 million. Successful integration of Crown's
operations will depend primarily on the Company's ability to manage Crown's
operations (which, as of September 30, 1997, added over 180 additional owned
or managed towers to the Company's 161 existing owned or managed towers) and
to integrate Crown's management with CCIC's management. There can be no
assurance that the Company can successfully integrate Crown into its business
or implement its plans without delay and any failure or any inability to do so
may have a material adverse effect on the Company's financial condition and
results of operations.
 
  Implementation of the Company's acquisition strategy may impose significant
strains on the Company's management, operating systems and financial
resources. Failure by the Company to manage its growth or unexpected
difficulties encountered during expansion could have a material adverse effect
on the Company's financial condition and results of operations. The pursuit
and integration of acquisitions, investments, joint ventures and strategic
alliances will require substantial attention from the Company's senior
management, which will limit the amount of time available to devote to the
Company's existing operations. Future acquisitions by the Company could result
in the incurrence of debt and contingent liabilities and an increase in
amortization expenses related to goodwill and other intangible assets, which
could have a material adverse effect upon the Company's financial condition
and results of operations.
 
DEPENDENCE ON DEMAND FOR WIRELESS COMMUNICATIONS; RISK ASSOCIATED WITH NEW
TECHNOLOGIES
 
  Demand for the Company's site rentals is dependent on demand for
communication sites from wireless communications carriers, which, in turn, is
dependent on the demand for wireless services. Most types of wireless services
currently require ground-based network facilities, including communication
sites for transmission and reception. The extent to which wireless
communications carriers lease such communication sites depends on a number of
factors beyond the Company's control, including the level of demand for such
wireless services, the financial condition and access to capital of such
carriers, the strategy of carriers with respect to owning or leasing
communication sites, government licensing of broadcast rights, changes in
telecommunications regulations and general economic conditions.
 
  The wireless communications industry has undergone significant growth in
recent years. A slowdown in the growth of, or reduction in, demand in a
particular wireless segment could adversely affect the demand for
communication sites. For example, the Company anticipates that a significant
amount of its revenues over the
 
                                      22
<PAGE>
 
next several years will be generated from carriers in the PCS market and, as
such, the Company will be subject to downturns in PCS demand. Moreover,
wireless communications carriers often operate with substantial leverage, and
financial problems for the Company's customers could result in accounts
receivable going uncollected, in the loss of a customer and the associated
lease revenue, or in a reduced ability of these customers to finance expansion
activities. While the Company generally has a diverse customer base, Nextel
(including PCI) and Sprint PCS accounted for approximately 17.5% and 14.1%,
respectively, of the Company's pro forma revenues for the nine months ended
September 30, 1997, and the Company expects Nextel to represent an even larger
portion of its business in the future.
 
  Finally, advances in technology, such as the development of new satellite
systems, could reduce the need for land-based transmission and reception
networks. The occurrence of any of these factors could have a material adverse
effect on the Company's financial condition and results of operations.
 
VARIABILITY IN QUARTERLY AND ANNUAL PERFORMANCE
 
  Demand for the Company's network services fluctuates from period to period
and within periods. These fluctuations are caused by a number of factors,
including the timing of customers' capital expenditures, annual budgetary
considerations of customers, the rate and volume of wireless communications
carriers' tower build-outs, timing of existing customer contracts and general
economic conditions. While such demand fluctuates, the Company must incur
certain costs, such as maintaining a staff of network services employees in
anticipation of future contracts, even when there may be no current business.
Consequently, the operating results of the Company's network services
businesses for any particular period may vary significantly, and should not be
considered as necessarily being indicative of longer-term results. For
example, the Company experienced a decline, as compared to the two previous
quarters, in demand for its network services business in the third quarter of
1997. There can be no assurance that the demand for such business will return
to the level of the two previous quarters. See "Management's Discussion and
Analysis of Financial Condition and Results of Operations--Unaudited
Supplemental Combined Adjusted Results of Operations--Discussion of Three
Months Ended September 30, 1997." Furthermore, as wireless communications
carriers complete their build-outs, the need for the construction of new
towers and the demand for certain network services could decrease
significantly and could result in fluctuations and, possibly, significant
declines in the Company's operating performance.
 
COMPETITION
 
  The Company competes for customers with (i) wireless communications carriers
that own and operate their own tower footprints and lease, or may in the
future decide to lease, antennae space to other carriers, (ii) site
development companies which acquire antennae space on existing towers for
wireless communications carriers and manage new tower construction, (iii)
other independent tower companies and (iv) traditional local independent tower
operators. Wireless communications carriers that own and operate their own
tower footprints generally are substantially larger and have greater financial
resources than the Company. The Company believes that tower location and
capacity, price, quality of service and density within a geographic market
historically have been and will continue to be the most significant
competitive factors affecting the site rental business.
 
  The Company competes for acquisition and new tower construction
opportunities with wireless communications carriers, site developers and other
independent tower operators. The Company believes that competition for tower
acquisitions will increase and that additional competitors will enter the
tower market. These additional competitors may have greater financial
resources than the Company.
 
RELATIONSHIP WITH MINORITY OWNED AFFILIATE; POTENTIAL CONFLICTS OF INTERESTS
 
  The Company currently owns a 34.3% interest in CTI. Part of the Company's
growth strategy includes capitalizing on certain managerial, technical and
engineering expertise within CTI and developing synergies that exist between
them in order to operate the Company's current business more efficiently and
to pursue future business opportunities. There can be no assurance that CTI
will cooperate with the Company or that the Company will be able to
successfully capitalize on these synergies. In addition, the Company's
investment in CTI represents a substantial portion of its asset base. The
Company does not have voting control of CTI and does not have the sole power
to determine the outcome of corporate transactions such as mergers,
consolidations and the sale of assets of CTI. The Company also has no access
to the cash flow of CTI.
 
                                      23
<PAGE>
 
  Ted B. Miller, Jr., CCIC's Chief Executive Officer, is also the Chief
Executive Officer of CTI. Carl Ferenbach, CCIC's Chairman of the Board, is
also the Chairman of the Board of CTI. Berkshire Partners LLC ("Berkshire")
and Berkshire Fund IV Group (as defined), each of which Mr. Ferenbach is a
Managing Director, hold approximately 17.6% of the stock of Castle
Transmission Services (Holdings) Ltd ("CTSH"), the parent company of the CTI
entities. Berkshire, Berkshire Fund IV Group and CCIC together hold over 51.9%
of CTSH's stock. The Company currently engages and intends to continue to
engage in transactions with CTI. The Company currently has no agreements with
CTI with respect to future corporate opportunities and there can be no
assurance that significant conflicts of interest between the Company and CTI
will not develop. In addition, CTI may engage in activities which compete
directly or indirectly with the activities or business interests of the
Company. There can be no assurance that CTI will not benefit from its general
knowledge of the Company's plans and strategies, which could provide CTI with
a competitive advantage over the Company. Finally, as Chief Executive Officer
of both CCIC and CTI, Mr. Miller may have conflicting demands on his time.
Currently, the Company has not adopted any procedures for managing conflicts
with CTI and does not foresee the need to adopt any such procedures in the
future. See "Certain Relationships and Related Transactions."
 
RISKS ASSOCIATED WITH DAMAGE TO TOWERS
 
  The Company's towers are subject to risks associated with natural disasters
such as tornadoes, hurricanes and earthquakes. The Company maintains insurance
to cover the estimated cost of replacing damaged towers (subject to certain
caps). The Company also maintains business interruption insurance, but only
with respect to the towers acquired in the Crown Merger, the Company's Puerto
Rico towers and certain of its other revenue producing towers. The Company's
10 highest revenue producing towers, six of which are in western Pennsylvania
and two of which are in Puerto Rico, accounted for 8.3% of the Company's pro
forma revenues for September 1997. The Company also maintains third party
liability insurance to protect the Company in the event of an accident
involving a tower. A tower accident for which the Company is uninsured or
underinsured, or damage to a tower or group of towers, could have a material
adverse effect on the Company's financial condition and results of operations.
 
RELIANCE ON NEXTEL AGREEMENT
 
  Pursuant to the Nextel Agreement, the Company has the right to construct up
to 250 new towers for Nextel and has exercised an option to acquire 50 of
Nextel's existing towers. See "Business--Significant Contracts." Nextel may
terminate the Nextel Agreement if the Company fails to complete the
construction of towers within an agreed period or if Nextel exercises its
purchase option (following certain construction delays by the Company) for the
greater of five towers or 5% of the aggregate number of total sites committed
to within a rolling eight-month period. Furthermore, the Nextel Agreement may
be terminated by Nextel upon either the insolvency or liquidation of the
Company. The Nextel Agreement represents a significant part of the Company's
business strategy, and termination of the Nextel Agreement would have a
material adverse effect on the Company's ability to achieve its business
strategy.
 
REGULATORY COMPLIANCE AND APPROVAL
 
  The Company is subject to a variety of regulation, including at the federal,
state and local level. Both the FCC and the FAA regulate towers and other
sites used for wireless communications transmitters and receivers. Such
regulations control siting and marking of towers and may, depending on the
characteristics of the tower, require registration of tower facilities.
Wireless communications devices operating on towers are separately regulated
and independently licensed based upon the regulation of the particular
frequency used. Most proposals to construct new antennae structures or to
modify existing antennae structures are reviewed by both the FCC and the FAA
to ensure that a structure will not present a hazard to aviation. Owners of
towers may have an obligation to paint them or install lighting to conform to
FCC standards and to maintain such painting or lighting. Tower owners may also
bear the responsibility for notifying the FAA of any tower lighting failures.
The Company generally indemnifies its customers against any failure to comply
with applicable standards. Failure to comply with applicable requirements may
lead to civil penalties.
 
                                      24
<PAGE>
 
  Local regulations include city or other local ordinances, zoning
restrictions and restrictive covenants imposed by community developers. These
regulations vary greatly, but typically require tower owners to obtain
approval from local officials or community standards organizations prior to
tower construction. Local regulations can delay or prevent new tower
construction or site upgrade projects, thereby limiting the Company's ability
to respond to customers' demands. In addition, such regulations increase the
costs associated with new tower construction. There can be no assurance that
existing regulatory policies will not adversely affect the timing or cost of
new tower construction or that additional regulations will not be adopted
which increase such delays or result in additional costs to the Company. Such
factors could have a material adverse effect on the Company's financial
condition and results of operations.
 
  The Company's customers may also become subject to new regulations or
regulatory policies which adversely affect the demand for communication sites.
In addition, as the Company pursues international opportunities, it will be
subject to regulation in foreign jurisdictions.
 
TITLE TO REAL PROPERTY
 
  The Company's real property interests relating to its towers consist of fee
interests, leasehold interests, private easements and licenses and easements
and rights-of-way granted by governmental entities. With respect to acquired
towers, the Company generally obtains title insurance on only the most
valuable fee properties and relies on title warranties from sellers with
respect to other acquired properties. The Company's ability to protect its
rights against persons claiming superior rights in towers depends on the
Company's ability to (i) recover under title policies, the policy limits of
which may be less than the purchase price of a particular tower; (ii) in the
absence of title insurance coverage, realize on title warranties given by
tower sellers, which warranties often terminate after the expiration of a
specific period (typically one to three years); and (iii) realize on title
covenants from landlords contained in lease agreements.
 
ENVIRONMENTAL MATTERS
 
  The Company's operations are subject to foreign, federal, state and local
environmental laws and regulations regarding the use, storage, disposal,
emission, release and remediation of hazardous and nonhazardous substances,
materials or wastes ("Environmental Laws"). Under certain Environmental Laws,
the Company could be held strictly, jointly and severally liable for the
remediation of hazardous substance contamination at its facilities or at
third-party waste disposal sites, and could also be held liable for any
personal or property damage related to such contamination. Although the
Company believes that it is in substantial compliance with all applicable
Environmental Laws, there can be no assurance that the costs of compliance
with existing or future Environmental Laws will not have a material adverse
effect on the Company's financial condition and results of operations. See
"Business--Regulatory and Environmental Matters."
 
PERCEIVED HEALTH RISKS ASSOCIATED WITH RADIO FREQUENCY EMISSIONS
 
  The Company and the wireless communications carriers that utilize the
Company's towers are subject to government requirements and other guidelines
relating to radio frequency ("RF") emissions. The potential connection between
RF emissions and certain negative health effects, including some forms of
cancer, has been the subject of substantial study by the scientific community
in recent years. To date, the results of these studies have been inconclusive.
Although the Company has not been subject to any claims relating to RF
emissions, there can be no assurance that it will not be subject to such
claims. See "--Environmental Matters" and "Business--Regulatory and
Environmental Matters."
 
CONCENTRATION OF OWNERSHIP; ANTI-TAKEOVER PROVISIONS; BOARD RIGHTS
 
  The Company's current executive officers, directors and their affiliates
beneficially own approximately 7,709,203 shares, or approximately 69.6%, of
the Class B Common Stock on a fully diluted basis as of the date hereof.
Robert A. Crown, president of Crown Communication and a director of the
Company, beneficially owns 1,465,000 shares, or approximately 13.2%, of the
Class B Common Stock on a fully diluted basis as of the date
 
                                      25
<PAGE>
 
hereof. Berkshire Partners Group (as defined), with which Carl Ferenbach, the
Chairman of the Board, and Garth H. Greimann, a director of the Company, are
affiliated, beneficially owns approximately 2,366,472 shares, or approximately
21.4%, of the Class B Common Stock on a fully diluted basis as of the date
hereof. Centennial Group (as defined), with which Jeffrey H. Schutz and David
C. Hull, Jr., both directors of the Company, are affiliated, beneficially owns
approximately 1,960,087 shares, or approximately 17.7%, of the Class B Common
Stock on a fully diluted basis as of the date hereof. Nassau Group (as
defined), with which Randall A. Hack, a director of the Company, is
affiliated, beneficially owns approximately 1,005,167 shares, or approximately
9.1%, of the Class B Common Stock on a fully diluted basis as of the date
hereof. Together, Mr. Crown, Berkshire Partners Group, Centennial Group and
Nassau Group beneficially own approximately 61.4% of the Class B Common Stock
on a fully diluted basis as of the date hereof.
 
  The Company's certificate of incorporation, as amended (the "Amended
Certificate"), and by-laws, as amended (the "By-laws"), contain certain
provisions that may have the effect of discouraging, delaying or preventing a
change in control of the Company or unsolicited acquisition proposals that a
stockholder might consider favorable, including provisions requiring
supermajority voting to effect certain amendments to the By-laws. Furthermore,
pursuant to the amended and restated stockholders agreement dated August 15,
1997, among the Company, Edward C. Hutcheson, Jr., Ted B. Miller, Jr., Robert
A. Crown, Barbara Crown and certain other investors (the "Stockholders
Agreement"), Mr. Crown is entitled to nominate one director for election to
the Board and the investor parties have agreed to vote their shares in favor
of Mr. Crown's nominee. The Stockholders Agreement also contains provisions
specifying the number of directors to be elected by stockholders of certain
series or classes, limiting the persons who may call special meetings of
stockholders and requiring super-majority voting to effect certain amendments
to the Amended Certificate.
 
  As a result of the provisions of the Amended Certificate, the By-laws and
the Stockholders Agreement and the substantial stock ownership of the parties
thereto, the persons described above have the ability to exercise substantial
influence over the Company's direction and to determine the outcome of
corporate actions requiring stockholder approval. This concentration of
ownership may have the effect of delaying or preventing a change in control of
the Company. See "Description of Capital Stock--Stockholders Agreement" and
"Ownership of Capital Stock."
 
DEPENDENCE ON PRINCIPAL EXECUTIVE OFFICERS
 
  The Company's existing operations and continued future development following
the Crown Merger are dependent to a significant extent upon the performance
and the active participation of certain key individuals, including Ted B.
Miller, Jr., David L. Ivy and Robert A. Crown. There can be no assurance that
the Company will be successful in retaining the services of these, or its
other, key personnel. The loss of the services of one or more of the Company's
key personnel could adversely affect the Company's financial condition and
results of operations. See "Management."
 
RISK OF FRAUDULENT CONVEYANCE LIABILITY
 
  Various laws enacted for the protection of creditors may apply to the
Company's incurrence of indebtedness and other obligations in connection with
the Transactions, including the issuance of the Notes. If a court were to find
in a lawsuit by an unpaid creditor or representative of creditors of the
Company that the Company did not receive fair consideration or reasonably
equivalent value for incurring such indebtedness or obligation and, at the
time of such incurrence, the Company (i) was insolvent; (ii) was rendered
insolvent by reason of such incurrence; (iii) was engaged in a business or
transaction for which the assets remaining in the Company constituted
unreasonably small capital; or (iv) intended to incur or believed it would
incur obligations beyond its ability to pay such obligations as they mature,
such court, subject to applicable statutes of limitation, could determine to
invalidate, in whole or in part, such indebtedness and obligations as
fraudulent conveyances or subordinate such indebtedness and obligations to
existing or future creditors of the Company.
 
  The measure of insolvency for purposes of the foregoing will vary depending
on the law of the jurisdiction which is being applied. Generally, however, the
Company would be considered insolvent at a particular time if the sum of its
debts was then greater than all of its property at a fair valuation or if the
present fair saleable
 
                                      26
<PAGE>
 
value of its assets was then less than the amount that would be required to
pay its probable liabilities on its existing debts as they became absolute and
matured. On the basis of its historical financial information, its recent
operating history as discussed in "Management's Discussion and Analysis of
Financial Condition and Results of Operations" and other factors, the
Company's management believes that, after giving effect to indebtedness
incurred in connection with the Crown Merger and the Refinancing, the Company
will not be rendered insolvent, it will have sufficient capital for the
businesses in which it will be engaged and it will be able to pay its debts as
they mature. However, management has not obtained any independent opinion
regarding such issues. There can be no assurance as to what standard a court
would apply in making such determinations.
 
ORIGINAL ISSUE DISCOUNT
 
  The Old Notes were issued at a substantial discount from their stated
principal amount at maturity. Consequently, although cash interest on the New
Notes generally will not be payable prior to May 15, 2003, original issue
discount ("OID") will be includable in the gross income of a holder of the New
Notes for U.S. federal income tax purposes in advance of the receipt of such
cash payments on the New Notes.
 
  If a bankruptcy case is commenced by or against CCIC under the U.S.
Bankruptcy Code after the issuance of the New Notes, the claim of a holder of
New Notes with respect to the principal amount thereof may be limited to an
amount equal to the sum of (i) the initial offering price and (ii) that
portion of the OID that is not deemed to constitute "unmatured interest" for
purposes of the U.S. Bankruptcy Code. Any OID that was not accrued as of any
such bankruptcy filing would constitute "unmatured interest."
 
REPURCHASE OF THE NOTES UPON A CHANGE OF CONTROL
   
  Upon a Change of Control, the holders of the Notes will have the right to
require CCIC to repurchase such holders' Notes, in whole or in part, at a
price equal to 101% of the Accreted Value thereof, plus Liquidated Damages
thereon, if any, to the date of purchase prior to November 15, 2002 or 101% of
the principal amount thereof, plus accrued and unpaid interest and Liquidated
Damages thereon, if any, to the date of purchase on or after November 15,
2002. If a Change of Control were to occur, there can be no assurance that
CCIC would have sufficient financial resources to repurchase all of the Notes
and repay any other indebtedness that would become payable upon the occurrence
of such Change of Control. For example, the occurrence of a Change in Control
would result in a default under the Senior Credit Facility, and any amounts
owed thereunder must be paid prior to CCIC's obligations to the holder of the
New Notes. The Change of Control purchase feature of the Notes may in certain
circumstances discourage or make more difficult a sale or takeover of the
Company. See "Description of the Notes--Repurchase at the Option of Holders--
Change of Control."     
 
ABSENCE OF PUBLIC MARKET FOR THE NEW NOTES
 
 
  The New Notes are a new issue of securities, have no established trading
market and may not be widely distributed. Although the Notes are eligible for
trading in PORTAL by "qualified institutional buyers" ("QIBs"), as defined in
Rule 144A under the Securities Act, there can be no assurance as to the
liquidity of any markets that may develop for the New Notes, the ability of
holders of the New Notes to sell their New Notes or the price at which holders
would be able to sell their New Notes. Future trading prices of the New Notes
will depend on many factors, including, among other things, prevailing
interest rates, the Company's operating results and the market for similar
securities. The Initial Purchasers have advised the Company that they
currently intend to make a market in the New Notes. However, the Initial
Purchasers are not obligated to do so and any market making may be
discontinued at any time without notice. The Company does not intend to apply
for listing of the New Notes offered hereby on any securities exchange. If a
market for the New Notes does develop, the price of the New Notes may
fluctuate and liquidity may be limited. If a market for the New Notes does not
develop, holders may be unable to resell such securities for an extended
period of time, if at all. If the market were to exist, the New Notes could
trade at prices lower than the initial offering price of the Old Notes
depending on many factors, including those described above.
 
  Historically, the market for non-investment grade debt has been subject to
disruptions that have caused substantial volatility in the prices of such
securities. There can be no assurance that the market for the New Notes will
not be subject to similar disruptions. Any such disruption may have an adverse
effect on holders of the New Notes.
 
                                      27
<PAGE>
 
                                USE OF PROCEEDS
 
  The Company will not receive any cash proceeds from the issuance of the New
Notes offered hereby. In consideration for issuing the New Notes as described
in this Prospectus, the Company will receive in exchange Old Notes in like
principal amount, the terms of which are identical in all material respects to
those of the New Notes, except that the New Notes have been registered under
the Securities Act and are issued free of any covenant regarding registration,
including the payment of additional interest upon a failure to file or have
declared effective an exchange offer registration statement or to consummate
the Exchange Offer by certain dates. The Old Notes surrendered in exchange for
the New Notes will be retired and canceled and cannot be reissued.
Accordingly, the issuance of the New Notes will not result in any change in
the indebtedness of the Company.
 
  The net proceeds received by the Company from the Offering of the Old Notes,
after deducting discounts and estimated fees and expenses, were approximately
$143.7 million. Such net proceeds were used to repay substantially all
outstanding indebtedness of the Company, including the indebtedness incurred
under the Senior Credit Facility in connection with the October Refinancing
and to pay related fees and expenses and are being used for general corporate
purposes. In addition to the Senior Credit Facility, the indebtedness that was
repaid included (i) a promissory note from CTC in favor of PCI (the "PCI
Note") in an aggregate principal amount of approximately $0.5 million, (ii)
four promissory notes from CCIC in favor of certain stockholders of TEA (the
"TEA Notes") in an aggregate principal amount of approximately $1.9 million,
and (iii) installment notes of Crown Communication (the "Crown Installment
Notes"), along with accrued interest, in an aggregate amount of approximately
$1.2 million.
 
 
 
                                      28
<PAGE>
 
                                CAPITALIZATION
 
  The following table sets forth (i) the actual capitalization of CCIC as of
September 30, 1997 and (ii) the pro forma capitalization of CCIC as of
September 30, 1997, after giving effect to the Refinancing. The information
set forth below should be read in conjunction with "Unaudited Pro Forma
Condensed Consolidated Financial Statements," "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and the
consolidated financial statements included elsewhere in this Prospectus.
 
<TABLE>
<CAPTION>
                                                        SEPTEMBER 30, 1997
                                                      ------------------------
                                                        ACTUAL      PRO FORMA
                                                      -----------  -----------
                                                      (DOLLARS IN THOUSANDS)
<S>                                                   <C>          <C>
Cash and cash equivalents............................ $    13,095  $    60,321
                                                      ===========  ===========
Notes payable and current maturities of long-term
 debt................................................ $    78,745  $       --
                                                      ===========  ===========
Long-term debt (less current maturities):
  Senior Credit Facility (a) ........................ $       --   $       --
  Bank credit agreements:
    Revolving credit facilities......................      36,450          --
    Term note........................................      11,667          --
  Promissory notes payable to former stockholders of
   TEA...............................................       1,445          --
  Promissory note payable to PCI.....................         340          --
  Promissory note payable for tower site.............         294          --
  Installment notes..................................         840          --
  10 5/8% Senior Discount Notes due 2007.............         --       150,010
                                                      -----------  -----------
      Total long-term debt...........................      51,036      150,010
                                                      -----------  -----------
Redeemable preferred stock: (b)
  Senior Convertible Preferred Stock.................      29,761       66,211
  Series A Convertible Preferred Stock...............       8,300        8,300
  Series B Convertible Preferred Stock...............      10,375       10,375
  Series C Convertible Preferred Stock...............      74,126       74,126
                                                      -----------  -----------
    Total redeemable preferred stock.................     122,562      159,012
                                                      -----------  -----------
Stockholders' equity:
  Common stock:
    Class A Common Stock.............................           2            2
    Class B Common Stock.............................          19           19
  Additional paid-in capital.........................      57,654       57,654
  Cumulative foreign currency translation
   adjustment........................................        (546)        (546)
  Accumulated deficit................................      (9,509)     (10,459)
                                                      -----------  -----------
      Total stockholders' equity.....................      47,620       46,670
                                                      -----------  -----------
        Total capitalization......................... $   221,218  $   355,692
                                                      ===========  ===========
</TABLE>
- --------
(a) As of January 5, 1998, the Company's principal operating subsidiary, Crown
    Communication, has approximately $85.3 million of unused borrowing
    availability under the Senior Credit Facility. See "Description of the
    Senior Credit Facility."
(b) The holders of the redeemable preferred stock have the right to require
    redemption on the earlier of 91 days after the tenth anniversary date of
    issuance of the Notes or May 15, 2008. See "Description of Capital Stock."
 
                                      29
<PAGE>
 
        UNAUDITED PRO FORMA CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
 
  The following unaudited pro forma condensed consolidated financial
statements (the "Pro Forma Financial Statements") are based on the historical
financial statements of CCIC and the historical financial statements of the
entities acquired by CCIC (including TEA and Crown) during the periods
presented, adjusted to give effect to the following transactions
(collectively, the "Transactions"); (i) the Puerto Rico Acquisition, (ii) the
CTI Investment, (iii) the TEA Acquisition, (iv) the acquisition of
TeleStructures (the "TeleStructures Acquisition"), (v) the Crown Merger
(together with the acquisitions described in clauses (i), (ii), (iii) and
(iv), the "Acquisitions") and (vi) the Refinancing.
 
  The Unaudited Pro Forma Condensed Consolidated Statement of Operations for
the year ended December 31, 1996 gives effect to the Transactions as if they
had occurred as of January 1, 1996, and the Unaudited Pro Forma Condensed
Consolidated Statement of Operations for the nine months ended September 30,
1997 gives effect to those of the Transactions occurring after December 31,
1996 as if they had occurred as of January 1, 1997. The Unaudited Pro Forma
Condensed Consolidated Balance Sheet gives effect to the Refinancing as if it
had occurred as of September 30, 1997. The pro forma adjustments are described
in the accompanying notes and are based upon available information and certain
assumptions that management believes are reasonable.
 
  The Pro Forma Financial Statements do not purport to represent what CCIC's
results of operations or financial condition would actually have been had the
Transactions in fact occurred on such dates or to project CCIC's results of
operations or financial condition for any future date or period. The Pro Forma
Financial Statements should be read in conjunction with the consolidated
financial statements included elsewhere in this Prospectus and "Management's
Discussion and Analysis of Financial Condition and Results of Operations."
   
  The Acquisitions are accounted for under the purchase method of accounting.
The total purchase price for each Acquisition has been allocated to the
identifiable tangible and intangible assets and liabilities of the applicable
acquired business based upon CCIC's preliminary estimate of their fair values
with the remainder allocated to goodwill and other intangible assets. The
allocations of the purchase prices are subject to revision when additional
information concerning asset and liability valuations is obtained; however,
the Company does not expect that any such revisions will have a material
effect on its consolidated financial position or results of operations.     
 
                                      30
<PAGE>
 
       UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
 
                          YEAR ENDED DECEMBER 31, 1996
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                          HISTORICAL
                       --------------------------------------------------                     PRO
                                 PUERTO                                    ADJUSTMENTS       FORMA     ADJUSTMENTS
                                  RICO                 TELE-                   FOR            FOR          FOR          PRO
                       CCIC(A)  SYSTEM(A) TEA(A)   STRUCTURES(A) CROWN(A)  ACQUISITIONS   ACQUISITIONS REFINANCING     FORMA
                       -------  --------- -------  ------------- --------  ------------   ------------ -----------    --------
<S>                    <C>      <C>       <C>      <C>           <C>       <C>            <C>          <C>            <C>
Net revenues:
 Site rental.........  $ 5,615   $  621   $   --       $--       $ 5,120     $    --        $ 11,356    $    --       $ 11,356
 Network services and
  other..............      592      533    18,010       865       14,260         (136)(b)     34,124         --         34,124
                       -------   ------   -------      ----      -------     --------       --------    --------      --------
  Total net
   revenues..........    6,207    1,154    18,010       865       19,380         (136)        45,480         --         45,480
                       -------   ------   -------      ----      -------     --------       --------    --------      --------
Operating expenses:
 Costs of operations:
 Site rental.........    1,292      223       --        --         1,691          --           3,206         --          3,206
 Network services and
  other..............        8       69    14,406       681        8,632         (520)(c)     23,276         --         23,276
 General and
  administrative.....    1,678      140     2,295       --         3,150          --           7,263         --          7,263
 Corporate
  development........    1,324      --        --        --           --           --           1,324         --          1,324
 Depreciation and
  amortization.......    1,242      276       134       --         1,168        9,059 (d)     11,879         --         11,879
                       -------   ------   -------      ----      -------     --------       --------    --------      --------
                         5,544      708    16,835       681       14,641        8,539         46,948         --         46,948
                       -------   ------   -------      ----      -------     --------       --------    --------      --------
Operating income
 (loss)..............      663      446     1,175       184        4,739       (8,675)        (1,468)        --         (1,468)
Other income
 (expense):
 Equity in losses of
  unconsolidated
  affiliate..........      --       --        --        --           --        (1,021)(e)     (1,021)        --         (1,021)
 Interest and other
  income (expense)...      193      --          3       --           (53)         --             143         --            143
 Interest expense and
  amortization of
  deferred financing
  costs..............   (1,803)     --       (127)       (4)      (1,175)      (9,006)(f)    (12,115)     (5,891)(h)   (18,006)
                       -------   ------   -------      ----      -------     --------       --------    --------      --------
Income (loss) before
 income taxes........     (947)     446     1,051       180        3,511      (18,702)       (14,461)     (5,891)      (20,352)
Provision for income
 taxes...............      (10)    (113)      --        --           --           121 (g)         (2)        --             (2)
                       -------   ------   -------      ----      -------     --------       --------    --------      --------
Net income (loss)....     (957)     333     1,051       180        3,511      (18,581)       (14,463)     (5,891)      (20,354)
Dividends on Senior
 Convertible
 Preferred Stock.....      --       --        --        --           --           --             --       (8,219)       (8,219)
                       -------   ------   -------      ----      -------     --------       --------    --------      --------
Net income (loss)
 after deduction of
 dividends on Senior
 Convertible
 Preferred Stock.....  $  (957)  $  333   $ 1,051      $180      $ 3,511     $(18,581)      $(14,463)   $(14,110)     $(28,573)
                       =======   ======   =======      ====      =======     ========       ========    ========      ========
</TABLE>
 
 
     See Notes to Unaudited Pro Forma Condensed Consolidated Statements of
                                   Operations
 
                                       31
<PAGE>
 
       UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
 
                      NINE MONTHS ENDED SEPTEMBER 30, 1997
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                       HISTORICAL                                     PRO
                          ---------------------------------------  ADJUSTMENTS       FORMA     ADJUSTMENTS
                                               TELE-                   FOR            FOR          FOR        PRO
                          CCIC(A)  TEA(A)  STRUCTURES(A) CROWN(A)  ACQUISITIONS   ACQUISITIONS REFINANCING   FORMA
                          -------  ------  ------------- --------  ------------   ------------ -----------  --------
<S>                       <C>      <C>     <C>           <C>       <C>            <C>          <C>          <C>
Net revenues:
 Site rental ...........  $ 6,743  $  --      $  --      $ 4,550     $   --         $ 11,293     $   --     $ 11,293
 Network services and
  other.................   12,668   7,615      1,212      13,137      (2,233)(b)      32,399         --       32,399
                          -------  ------     ------     -------     -------        --------     -------    --------
  Total net revenues....   19,411   7,615      1,212      17,687      (2,233)         43,692         --       43,692
                          -------  ------     ------     -------     -------        --------     -------    --------
Operating expenses:
 Costs of operations:
 Site rental............    1,422     --         --        1,421         --            2,843         --        2,843
 Network services and
  other.................    7,187   6,454      1,008       5,841      (1,134)(c)      19,356         --       19,356
 General and
  administrative........    3,841     644         25       3,761         --            8,271         --        8,271
 Corporate development..    4,654     --         --          --       (2,224)(i)       2,430         --        2,430
 Depreciation and
  amortization..........    3,295      52        --        1,006       5,171 (d)       9,524         --        9,524
                          -------  ------     ------     -------     -------        --------     -------    --------
                           20,399   7,150      1,033      12,029       1,813          42,424         --       42,424
                          -------  ------     ------     -------     -------        --------     -------    --------
Operating income
 (loss).................     (988)    465        179       5,658      (4,046)          1,268         --        1,268
Other income (expense):
 Equity in losses of
  unconsolidated
  affiliate.............   (1,189)    --         --          --         (136)(e)      (1,325)        --       (1,325)
 Interest and other
  income (expense)......      441       9        --          (26)        --              424         --          424
 Interest expense and
  amortization of
  deferred financing
  costs.................   (4,368)    (18)       --         (925)     (5,291)(f)     (10,602)    (2,712)(h)  (13,314)
                          -------  ------     ------     -------     -------        --------     -------    --------
Income (loss) before
 income taxes...........   (6,104)    456        179       4,707      (9,473)        (10,235)     (2,712)    (12,947)
Provision for income
 taxes..................      (46)     (1)       --          --          --              (47)        --          (47)
                          -------  ------     ------     -------     -------        --------     -------    --------
Net income (loss).......   (6,150)    455        179       4,707      (9,473)        (10,282)     (2,712)    (12,994)
Dividends on Senior
 Convertible Preferred
 Stock..................     (461)    --         --          --          --             (461)     (5,686)     (6,147)
                          -------  ------     ------     -------     -------        --------     -------    --------
Net income (loss) after
 deduction of dividends
 on Senior Convertible
 Preferred Stock........  $(6,611) $  455     $  179     $ 4,707     $(9,473)       $(10,743)    $(8,398)   $(19,141)
                          =======  ======     ======     =======     =======        ========     =======    ========
</TABLE>
 
 
     See Notes to Unaudited Pro Forma Condensed Consolidated Statements of
                                   Operations
 
                                       32
<PAGE>
 
 NOTES TO UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                            (DOLLARS IN THOUSANDS)
 
(a) The historical results of operations for each of the entities acquired by
    CCIC in the Acquisitions are included in CCIC's historical results of
    operations for the period from their respective dates of acquisition
    through the end of the period presented. The historical results of
    operations presented for each of the acquired entities are their pre-
    acquisition results of operations. Set forth below are the respective
    dates of each Acquisition:
 
<TABLE>
<CAPTION>
     COMPANY                                                     DATE
     -------                                                     ----
     <S>                                                         <C>
     Puerto Rico System......................................... June 28, 1996
     TEA........................................................ May 12, 1997
     TeleStructures............................................. May 12, 1997
     Crown...................................................... August 15, 1997
</TABLE>
 
(b) Reflects the following adjustments to net revenues:
 
<TABLE>
<CAPTION>
                                              YEAR ENDED     NINE MONTHS ENDED
                                           DECEMBER 31, 1996 SEPTEMBER 30, 1997
                                           ----------------- ------------------
     <S>                                   <C>               <C>
     Elimination of intercompany sales
      between TEA and TeleStructures.....        $(520)           $(1,134)
     Elimination of nonrecurring success
      fee received by CCIC in connection
      with transactions related to the
      CTI Investment.....................          --              (1,165)
     Addition of management fee payable
      to CCIC from CTI for the portion of
      the period preceding the CTI
      Investment(i)......................          384                 66
                                                 -----            -------
        Total adjustments to net reve-
         nues............................        $(136)           $(2,233)
                                                 =====            =======
</TABLE>
    --------
    (i) The CTI Investment was consummated on February 28, 1997. Management
        fees received by CCIC during the period subsequent to the CTI
        Investment are reflected in CCIC's historical results of
        operations.
 
(c) Reflects the elimination of intercompany transactions between TEA and
    TeleStructures.
 
(d) Reflects the incremental amortization of goodwill and other intangible
    assets and the incremental depreciation of property and equipment as a
    result of the Acquisitions. Goodwill is being amortized over twenty years
    and other intangible assets (primarily existing contracts) are being
    amortized over ten years.
 
(e) Reflects equity accounting adjustments to include CCIC's percentage in
    CTI's losses for the preinvestment period.
 
(f) Reflects additional interest expense attributable to the Seller Note, the
    TEA Notes and borrowings under the Senior Credit Facility prior to October
    31, 1997 at interest rates ranging from 8.0% to 11.0%.
 
(g) Reflects adjustment to income taxes based on statutory income tax rate in
    Puerto Rico.
   
(h) Reflects net increase or decrease in interest expense as a result of the
    issuance of the Old Notes in connection with the Refinancing at an
    interest rate on the Old Notes of 10.625% per annum. The adjustment for
    the nine months ended September 30, 1997 includes the elimination of
    $1,020 of nonrecurring financing fees charged to interest expense in
    September 1997. Such fees related to an unfunded interim loan facility
    related to the Crown Merger.     
 
(i) Reflects the elimination of (i) nonrecurring cash bonus awards of $913
    paid to certain executive officers paid in connection with the CTI
    Investment and (ii) a nonrecurring cash charge of $1,311 related to the
    purchase by CCIC of shares of Class B Common Stock from CCIC's former
    chief executive officer in connection with the CTI Investment. See
    "Certain Relationships and Related Transactions."
 
                                      33
<PAGE>
 
            UNAUDITED PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
 
                            AS OF SEPTEMBER 30, 1997
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                         HISTORICAL   ADJUSTMENTS
                                            CCIC    FOR REFINANCING  PRO FORMA
                                         ---------- ---------------  ---------
<S>                                      <C>        <C>              <C>
ASSETS:
Current assets:
  Cash and cash equivalents.............  $ 13,095     $ 47,226 (a)  $ 60,321
  Receivables...........................     8,718          --          8,718
  Other current assets..................     1,531          --          1,531
                                          --------     --------      --------
    Total current assets................    23,344       47,226        70,570
Property and equipment, net.............    69,855          --         69,855
Investments in and advances to
 affiliates.............................    57,889          --         57,889
Goodwill and other intangible assets,
 net....................................   153,825          --        153,825
Other assets, net.......................     3,482        7,575 (b)    11,057
                                          --------     --------      --------
                                          $308,395     $ 54,801      $363,196
                                          ========     ========      ========
LIABILITIES AND STOCKHOLDERS' EQUITY:
Current liabilities:
  Accounts payable......................  $  3,346     $    --       $  3,346
  Other current liabilities.............     3,522         (928)(c)     2,594
  Long-term debt, current maturities....    78,745      (78,745)(d)       --
                                          --------     --------      --------
    Total current liabilities...........    85,613      (79,673)        5,940
Long-term debt, less current
 maturities.............................    51,036       98,974 (e)   150,010
Other liabilities.......................     1,564          --          1,564
                                          --------     --------      --------
    Total liabilities...................   138,213       19,301       157,514
                                          --------     --------      --------
Redeemable preferred stock..............   122,562       36,450 (f)   159,012
Stockholders' equity....................    47,620         (950)(g)    46,670
                                          --------     --------      --------
                                          $308,395     $ 54,801      $363,196
                                          ========     ========      ========
</TABLE>
 
 
     See Notes to Unaudited Pro Forma Condensed Consolidated Balance Sheet
 
                                       34
<PAGE>
 
       NOTES TO UNAUDITED PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
                            (DOLLARS IN THOUSANDS)
 
(a) Reflects the following adjustments to cash and cash equivalents:
 
<TABLE>
     <S>                                                               <C>
     Increase resulting from the receipt of proceeds from the
      issuance and sale of Senior Convertible Preferred Stock in
      connection with the October Refinancing........................  $  36,450
     Increase resulting from borrowings under the Senior Credit
      Facility in connection with the October Refinancing(i).........     92,216
     Decrease resulting from the payment of initial purchasers'
      discount relating to the Old Notes, fees related to obtaining
      the Senior Credit Facility, fees paid in connection with an
      unfunded interim loan facility and other fees and expenses
      related to the Refinancing.....................................     (8,525)
     Decrease resulting from the repayment of amounts outstanding
      under the Senior Credit Facility, amounts outstanding under a
      bank facility at Crown Communication and the repayment of the
      Seller Note(ii)................................................   (126,441)
     Increase resulting from the receipt of proceeds from the
      issuance and sale of the Old Notes.............................    150,010
     Decrease resulting from the repayment of loans incurred under
      the Senior Credit Facility in connection with the October Bank
      Financing and the repayment of the PCI Note, the TEA Notes,
      amounts outstanding under the TEA Line of Credit and the Crown
      Installment Notes..............................................    (96,484)
                                                                       ---------
      Total adjustments to cash and cash equivalents.................  $  47,226
                                                                       =========
</TABLE>
    ------------
    (i) The Refinancing was accomplished in a two-step transaction. In
        connection with the October Bank Financing, CCIC refinanced all
        amounts then outstanding under the Senior Credit Facility with new
        borrowings thereunder. See "Prospectus Summary--The Refinancing."
    (ii) CCIC repaid such indebtedness in the October Refinancing as the
         first step of the Refinancing. See "Prospectus Summary--The
         Refinancing."
 
(b) Reflects deferred financing costs incurred in connection with the
    Refinancing.
 
(c) Reflects the repayment of accrued interest on the Seller Note in
    connection with the October Refinancing.
 
(d) Reflects the repayment of (i) the Seller Note ($76,230), (ii) the TEA Line
    of Credit ($394) and (iii) the current portion of the TEA Notes, the PCI
    Notes, the Crown Installment Notes and the Crown Communication bank
    facility ($2,121).
 
(e) Reflects the following adjustments to long-term debt, less current
    maturities:
 
<TABLE>
     <S>                                                                <C>
     Incurrence of October Bank Financing.............................  $ 92,216
     Repayment of loans outstanding under the Senior Credit Facility
      and Crown Communication's bank facility, other than current
      portion.........................................................   (48,117)
     Issuance of the Old Notes........................................   150,010
     Repayment of all amounts under the Senior Credit Facility, the
      TEA Notes, the PCI Note and the Crown Installment Notes, other
      than current portions...........................................   (95,135)
                                                                        --------
      Total adjustments to long-term debt, less current maturities....  $ 98,974
                                                                        ========
</TABLE>
 
(f) Reflects the issuance of the Senior Convertible Preferred Stock in
    connection with the October Refinancing.
 
(g) Reflects the write-off of certain nonrecurring financing fees that the
    Company expects to pay during the fourth quarter of 1997.
 
                                      35
<PAGE>
 
                   SELECTED FINANCIAL AND OTHER DATA OF CCIC
 
  The selected historical consolidated financial data for CCIC presented below
for each of the two years in the period ended December 31, 1996, and as of
December 31, 1995 and 1996, have been derived from the consolidated financial
statements of CCIC, which have been audited by KPMG Peat Marwick LLP,
independent certified public accountants. The selected historical consolidated
financial data for each of the nine-month periods ended September 30, 1996 and
1997, and as of September 30, 1997, have been derived from unaudited
consolidated financial statements of CCIC which, in the opinion of management,
include all adjustments (consisting of normal recurring items) necessary for a
fair and consistent presentation of such data. The information set forth below
should be read in conjunction with "Management's Discussion and Analysis of
Financial Condition and Results of Operations--Results of Operations--The
Company" and the consolidated financial statements of CCIC included elsewhere
in this Prospectus.
 
<TABLE>   
<CAPTION>
                                             YEARS ENDED     NINE MONTHS ENDED
                                            DECEMBER 31,       SEPTEMBER 30,
                                           ----------------  ------------------
                                            1995     1996      1996      1997
                                           -------  -------  --------  --------
                                                (DOLLARS IN THOUSANDS)
<S>                                        <C>      <C>      <C>       <C>
STATEMENT OF OPERATIONS DATA:
Net revenues:
  Site rental............................  $ 4,052  $ 5,615  $  4,001  $  6,743
  Network services and other(a)..........        6      592       304    12,668
                                           -------  -------  --------  --------
    Total net revenues...................    4,058    6,207     4,305    19,411
                                           -------  -------  --------  --------
Costs of operations:
  Site rental............................    1,226    1,292       937     1,422
  Network services and other.............      --         8       --      7,187
                                           -------  -------  --------  --------
    Total costs of operations............    1,226    1,300       937     8,609
                                           -------  -------  --------  --------
General and administrative...............      729    1,678     1,211     3,841
Corporate development(b).................      204    1,324       716     4,654
Depreciation and amortization............      836    1,242       868     3,295
                                           -------  -------  --------  --------
Operating income (loss)..................    1,063      663       573      (988)
Equity in losses of unconsolidated
 affiliate...............................      --       --        --     (1,189)
Interest and other income................       53      193       101       441
Interest expense and amortization of
 deferred financing costs................   (1,137)  (1,803)   (1,229)   (4,368)
                                           -------  -------  --------  --------
Income (loss) before income taxes........      (21)    (947)     (555)   (6,104)
Provision for income taxes...............      --       (10)      --        (46)
                                           -------  -------  --------  --------
Net income (loss)........................      (21)    (957)     (555)   (6,150)
Dividends on Senior Convertible Preferred
 Stock...................................      --       --        --       (461)
                                           -------  -------  --------  --------
Net income (loss) after deduction of
 dividends on Senior Convertible
 Preferred Stock.........................  $   (21) $  (957) $   (555) $ (6,611)
                                           =======  =======  ========  ========
OTHER DATA:
Site data (at period end):(c)
  Towers owned...........................      126      155       154       215
  Towers managed.........................        7        7         7       134
  Rooftop sites managed (revenue
   producing)(d).........................       41       52        49        82
                                           -------  -------  --------  --------
    Total sites owned and managed........      174      214       210       431
                                           =======  =======  ========  ========
EBITDA(e)................................  $ 1,899  $ 1,905  $  1,441  $  2,307
Capital expenditures.....................      161      890       595     5,295
Summary cash flow information:
  Net cash provided by (used for) operat-
   ing activities........................    1,672     (530)      649    (2,061)
  Net cash used for investing activities
   ......................................  (16,673) (13,916)  (13,196)  (97,242)
  Net cash provided by financing activi-
   ties..................................   15,597   21,193    21,068   105,055
Ratio of earnings to fixed charges(f)....      --       --        --        --
</TABLE>    
 
                                      36
<PAGE>
 
<TABLE>
<CAPTION>
                                              YEARS ENDED   NINE MONTHS ENDED
                                             DECEMBER 31,     SEPTEMBER 30,
                                            --------------- -------------------
                                             1995    1996    1996      1997
                                            ------- ------- -------------------
                                                 (DOLLARS IN THOUSANDS)
<S>                                         <C>     <C>     <C>     <C>
BALANCE SHEET DATA (AT PERIOD END):
Cash and cash equivalents.................. $   596 $ 7,343         $    13,095
Property and equipment, net................  16,003  26,753              69,855
Total assets...............................  19,875  41,226             308,395
Total debt.................................  11,182  22,052             129,781
Redeemable preferred stock(g)..............   5,175  15,550             122,562
Total stockholders' equity (deficit).......     619   (210)              47,620
</TABLE>
- --------
(a) Includes a $1.2 million fee received in March 1997 as compensation for
    leading the investment consortium which provided the equity financing for
    CTI in connection with the CTI Investment.
 
(b) Corporate development expenses represent costs incurred in connection with
    acquisitions and development of new business initiatives. These expenses
    consist primarily of allocated compensation, benefits and overhead costs
    that are not directly related to the administration or management of
    existing towers. For the nine-month period ended September 30, 1997,
    includes (i) nonrecurring cash bonuses of $913 paid to certain executive
    officers in connection with the CTI Investment and (ii) a nonrecurring
    cash charge of $1,311 related to the purchase by CCIC of shares of Class B
    Common Stock from CCIC's former chief executive officer in connection with
    the CTI Investment. See "Certain Relationships and Related Transactions."
 
(c) Represents the aggregate number of sites of CCIC as of the end of each
    period.
   
(d) As of September 30, 1997, the Company had contracts with 1,438 buildings
    to manage on behalf of such buildings the leasing of space for antennae on
    the rooftops of such buildings. A revenue producing rooftop represents a
    rooftop where the Company has arranged a lease of space on such rooftop
    and, as such, is receiving payments in respect of its management contract.
    The Company generally does not receive any payment for rooftops under
    management unless the Company actually leases space on such rooftops to
    third parties. As of September 30, 1997, the Company had 1,356 rooftop
    sites under management throughout the United States that were not revenue
    producing rooftops but were available for leasing to customers.     
          
(e) EBITDA is defined as operating income (loss) plus depreciation and
    amortization. EBITDA is presented as additional information because
    management believes it to be a useful indicator of the Company's ability
    to meet debt service and capital expenditure requirements. It is not,
    however, intended as an alternative measure of operating results or cash
    flow from operations (as determined in accordance with generally accepted
    accounting principles). Furthermore, the Company's measure of EBITDA may
    not be comparable to similarly titled measures of other companies.     
 
(f) For purposes of computing the ratio of earnings to fixed charges, earnings
    represent net income (loss) before income taxes, fixed charges and equity
    in losses of unconsolidated affiliate. Fixed charges consist of interest
    expense, the interest component of operating leases and amortization of
    deferred financing costs. For the years ended December 31, 1995 and 1996,
    and the nine months ended September 30, 1996 and 1997, earnings were
    insufficient to cover fixed charges by $21, $947, $555 and $4,915,
    respectively.
 
(g) Represents (i) the Senior Convertible Preferred Stock privately placed by
    CCIC in August 1997 and October 1997, which is mandatorily redeemable upon
    the earlier of (A) 91 days after the tenth anniversary date of the
    issuance of the Notes or (B) May 15, 2008 and (ii) the Series A
    Convertible Preferred Stock, the Series B Convertible Preferred Stock, and
    the Series C Convertible Preferred Stock privately placed by CCIC in April
    1995, July 1996 and February 1997, respectively, all of which are
    redeemable at the option of the holder beginning on the same date upon
    which the Senior Convertible Preferred Stock is mandatorily redeemable.
 
                                      37
<PAGE>
 
                  SELECTED FINANCIAL AND OTHER DATA OF CROWN
 
  The selected historical combined financial data for Crown presented below
for each of the two years in the period ended December 31, 1996, and as of
December 31, 1995 and 1996, have been derived from the combined financial
statements of Crown, which have been audited by KPMG Peat Marwick LLP,
independent certified public accountants. The selected historical combined
financial data for each of the six-month periods ended June 30, 1996 and 1997,
and as of June 30, 1997, have been derived from unaudited combined financial
statements of Crown which, in the opinion of Crown's management, include all
adjustments (consisting of normal recurring items) necessary for a fair and
consistent presentation of such data. Crown was acquired by CCIC in the Crown
Merger in August 1997 and, as a result, nine-month historical financial data
for Crown is not presented. The information set forth below should be read in
conjunction with "Management's Discussion and Analysis of Financial Condition
and Results of Operations--Results of Operations--Crown" and the combined
financial statements of Crown included elsewhere in this Prospectus.
 
<TABLE>
<CAPTION>
                                              YEARS ENDED       SIX MONTHS
                                             DECEMBER 31,     ENDED JUNE 30,
                                            ----------------  ----------------
                                             1995     1996     1996     1997
                                            -------  -------  -------  -------
                                                (DOLLARS IN THOUSANDS)
<S>                                         <C>      <C>      <C>      <C>
STATEMENT OF OPERATIONS DATA:
Net revenues:
  Site rental.............................. $ 3,632  $ 5,120  $ 2,239  $ 3,815
  Network services and other...............   7,384   14,260    5,950   12,022
                                            -------  -------  -------  -------
    Total net revenues.....................  11,016   19,380    8,189   15,837
                                            -------  -------  -------  -------
Costs of operations:
  Site rental..............................     763    1,691      600    1,150
  Network services and other...............   3,944    8,632    3,877    5,138
                                            -------  -------  -------  -------
    Total costs of operations..............   4,707   10,323    4,477    6,288
                                            -------  -------  -------  -------
General and administrative.................   2,625    3,150    1,163    3,163
Depreciation and amortization..............     568    1,168      452      842
                                            -------  -------  -------  -------
Operating income...........................   3,116    4,739    2,097    5,544
Interest and other income (expense)........      19      (53)      (8)     (29)
Interest expense...........................    (785)  (1,175)    (526)    (774)
                                            -------  -------  -------  -------
Income before income taxes.................   2,350    3,511    1,563    4,741
Provision for income taxes.................     --       --       --       --
                                            -------  -------  -------  -------
Net income................................. $ 2,350  $ 3,511  $ 1,563  $ 4,741
                                            =======  =======  =======  =======
OTHER DATA:
Site data (at period end):(a)
  Towers owned.............................      45       53       50       54
  Towers managed...........................     122      127      125      127
  Rooftop sites managed (revenue
   producing)..............................       9       16       15       20
                                            -------  -------  -------  -------
    Total sites owned and managed..........     176      196      190      201
                                            =======  =======  =======  =======
EBITDA:(b)
  Site rental.............................. $ 2,589  $ 3,098  $ 1,534  $ 2,513
  Network services and other...............   1,095    2,809    1,015    3,873
                                            -------  -------  -------  -------
    Total.................................. $ 3,684  $ 5,907  $ 2,549  $ 6,386
                                            =======  =======  =======  =======
</TABLE>
 
                                      38
<PAGE>
 
<TABLE>   
<CAPTION>
                               YEARS ENDED       SIX MONTHS
                              DECEMBER 31,     ENDED JUNE 30,
                             ----------------  ---------------
                              1995     1996     1996    1997
                             -------  -------  ------  -------
                                 (DOLLARS IN THOUSANDS)
<S>                          <C>      <C>      <C>     <C>
EBITDA as a percentage of
 net revenues:(b)
  Site rental...............    71.3%    60.5%   68.5%    65.9%
  Network services and
   other....................    14.8%    19.7%   17.1%    32.2%
    Total...................    33.4%    30.5%   31.1%    40.3%
Capital expenditures........ $ 5,670  $ 8,658  $2,378  $10,678
Summary cash flow
 information:
  Net cash provided by
   operating activities.....   2,974    4,162     118    6,394
  Net cash used for
   investing activities.....  (5,670)  (8,652) (3,178) (10,678)
  Net cash provided by
   financing activities.....   2,367    4,100   2,544    4,634
Ratio of earnings to fixed
 charges(c).................                             5.63x
BALANCE SHEET DATA (AT
 PERIOD END):
Cash and cash equivalents... $   764  $   374          $   724
Property and equipment,
 net........................  13,877   21,362           31,047
Total assets................  16,014   25,589           37,363
Total debt..................  10,575   17,381           23,625
Total owners' equity........   3,506    4,311            7,520
</TABLE>    
- --------
(a) Represents the aggregate number of sites of Crown as of the end of each
    period.
   
(b) EBITDA is defined as operating income plus depreciation and amortization.
    EBITDA is presented as additional information because management believes
    it to be a useful indicator of a company's ability to meet debt service
    and capital expenditure requirements. It is not, however, intended as an
    alternative measure of operating results or cash flow from operations (as
    determined in accordance with generally accepted accounting principles).
    Furthermore, Crown's measure of EBITDA may not be comparable to similarly
    titled measures of other companies.     
(c) For purposes of computing the ratio of earnings to fixed charges, earnings
    represent net income before income taxes and fixed charges. Fixed charges
    consist of interest expense, the interest component of operating leases
    and amortization of deferred financing costs.
 
                                      39
<PAGE>
 
               MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                      CONDITION AND RESULTS OF OPERATIONS
 
  The following discussion is intended to assist in understanding (i) the
Company's consolidated financial condition and results of operations as of
September 30, 1997 and for the nine-month periods ended September 30, 1996 and
1997 and each year in the two-year period ended December 31, 1996; and (ii)
Crown's combined results of operations for the six-month periods ended June
30, 1996 and 1997 and each year in the two-year period ended December 31,
1996. The statements in this discussion regarding the industry outlook, the
Company's expectations regarding the future performance of its businesses, and
the other nonhistorical statements in this discussion are forward-looking
statements. These forward-looking statements are subject to numerous risks and
uncertainties, including but not limited to the uncertainties relating to
capital expenditures decisions to be made in the future by wireless
communications carriers and the risks and uncertainties described in "Risk
Factors." This discussion should be read in conjunction with "Unaudited Pro
Forma Condensed Consolidated Financial Statements," "Selected Financial and
Other Data of CCIC," "Selected Financial Data and Other Data of Crown" and the
consolidated financial statements included elsewhere in this Prospectus.
 
  In addition to the discussion of historical results of operations set forth
below, the Company has provided a "combined results of operations" discussion
of CCIC, Crown and certain other acquired businesses for the nine-month
periods ended September 30, 1996 and 1997, for each year in the two-year
period ended December 31, 1996 and for the three-month period ended September
30, 1997. See "--Unaudited Supplemental Combined Adjusted Results of
Operations." Management believes that the historical financial statements
included elsewhere herein do not, by themselves, provide investors with
sufficient information to adequately assess the trends in the combined
businesses. The Company is providing this additional information, therefore,
to supplement the historical financial information discussed below.
 
OVERVIEW
 
  The Company's business depends substantially on the condition of the
wireless communications industry and the willingness of wireless
communications carriers to utilize the Company's assets and services to build
out their wireless networks. The wireless communications industry's
willingness to outsource its network build-out is affected, in turn, by
numerous factors, including consumer demand for wireless services, interest
rates, cost of capital, availability of capital to wireless carriers, tax
policies, willingness to co-locate equipment on the same towers with other
wireless communications carriers (including direct competitors), local
restrictions on the proliferation of towers, cost of building towers and
technological changes affecting the number of communication sites needed to
provide wireless services to a given geographic area.
 
  The Company believes that the demand for wireless networks will continue to
grow and expects that wireless communications carriers will increasingly turn
to network services providers such as the Company to build out and manage
those networks. Moreover, the Company believes that wireless carriers will be
increasingly receptive to co-location out of economic necessity and regulatory
pressures, as capital constraints and increasing restrictions on the
proliferation of towers conflict with a growing need for such sites.
 
  CTC, a Delaware corporation, was organized on December 21, 1994 and began
operations on January 1, 1995. CCIC, a Delaware corporation, was organized on
April 20, 1995. On April 27, 1995, the stockholders of CTC contributed all the
outstanding shares of CTC's stock to the Company in exchange for shares of the
Company's stock. See "Certain Relationships and Related Transactions."
 
  The Company acquired a total of 127 towers from PCI from January through
November 1995. A number of other business acquisitions and investments were
consummated following the PCI acquisition. In October 1995, the Company
acquired substantially all the property and equipment and operations of
Spectrum (the "Spectrum Acquisition"), which provides management services for
rooftop sites. In June 1996, the Company consummated the Puerto Rico
Acquisition. During 1995 and 1996, the Company acquired 22 additional towers
from three
 
                                      40
<PAGE>
 
separate sellers. In February 1997, the Company purchased its ownership
interest of approximately 34.3% in CTI. In May 1997, the Company consummated
the TEA Acquisition and the TeleStructures Acquisition. In June 1997, the
Company made an investment in Visual Intelligence Systems, Inc. ("VISI"), a
provider of computerized geographic information for a variety of business
applications (including the acquisition and design of telecommunications
sites). Finally, in August 1997, the Company consummated the Crown Merger.
Results of operations of the acquired businesses which are wholly owned are
included in the Company's consolidated financial statements for the periods
subsequent to the respective dates of acquisition.
 
  As an important part of its business strategy, the Company will continue to
enhance its tower footprints and take advantage of the operating leverage of
its site rental business by increasing the amount of antennae space leased on
its owned or managed communication sites, expanding its tower footprints
through the build-out of towers and the acquisition of towers and maintaining
its in-house technical and operational expertise.
 
RESULTS OF OPERATIONS
 
 The Company
 
  The Company's primary sources of revenues are from (i) the rental of
antennae space on towers and rooftop sites and (ii) the provision of network
services, which includes site selection and acquisition, antennae
installation, site development and construction and network design.
   
  Site rental revenues are received primarily from wireless communications
companies, including cellular, Personal Communications Services ("PCS"),
paging, specialized mobile radio/enhanced specialized mobile radio
("SMR/ESMR") and microwave operators. Site rental revenues are generally
recognized on a monthly basis under lease agreements, which typically have
original terms of five years (with three or four optional renewal periods of
five years each). Average monthly site rental revenues per owned site as of
September 30, 1997 were approximately $3,000 for the towers located in the
southwestern United States, $7,000 for the towers in Puerto Rico, $12,500 for
the towers in and around the greater Pittsburgh area, and $2,000 for the
Company's other revenue producing towers. Average revenues for the Company's
managed rooftop sites are less than for the owned and managed towers because a
substantial portion of the revenues from the tenants at rooftop sites is
remitted to the building owner or manager.     
 
  Network services revenues consist of revenues from (i) site selection and
acquisition, (ii) site development, construction and antennae installation and
(iii) other services. Network services revenues are received primarily from
wireless communications companies. Network services revenues are recognized
under service contracts which provide for billings on either a fixed price
basis or a time and materials basis. Larger network services contracts are
generally billed on a fixed price basis. Service contracts for site
development, construction and antennae installation typically have terms not
exceeding one year. Service contracts for site selection and acquisition
typically have terms ranging from 6 months to 2 years. Demand for the
Company's network services fluctuates from period to period and within
periods. These fluctuations are caused by a number of factors, including the
timing of customers' capital expenditures, annual budgetary considerations of
customers, the rate and volume of wireless communications carriers' tower
build-outs, timing of existing customer contracts and general economic
conditions. While such demand fluctuates, the Company must incur certain
costs, such as maintaining a staff of network services employees in
anticipation of future contracts, even when there may be no current business.
Consequently, the operating results of the Company's network services
businesses for any particular period may vary significantly, and should not be
considered as necessarily being indicative of longer-term results. The Company
also derives revenues from SMR and microwave radio services in Puerto Rico.
These revenues are generally recognized under monthly management or service
agreements. Average monthly revenues as of September 30, 1997 from SMR and
microwave services were approximately $77,000 and $12,000, respectively. Other
revenues also include a monthly service fee of approximately $33,000 from CTI
as compensation for certain management services.
 
  Costs of operations for site rental primarily consist of land leases,
repairs and maintenance, utilities, insurance, property taxes and monitoring
costs and, in the case of managed sites, rental payments. For any given tower,
such costs are relatively fixed over a monthly or an annual time period. As
such, operating costs for owned
 
                                      41
<PAGE>
 
towers do not generally increase significantly as additional customers are
added. However, rental expenses at certain managed towers increase as
additional customer antennae are added, resulting in higher incremental
revenues but lower incremental margins than on owned towers. Costs of
operations for network services consist primarily of employee compensation and
related benefits costs, subcontractor services, consulting fees, and other on-
site construction and materials costs.
 
  General and administrative expenses consist primarily of employee
compensation and related benefits costs, advertising, professional and
consulting fees, office rent and related expenses and travel costs. Corporate
development expenses represent costs incurred in connection with acquisitions
and development of new business initiatives. These expenses consist primarily
of allocated compensation, benefits and overhead costs that are not directly
related to the administration or management of existing towers.
 
  Depreciation and amortization charges relate to the Company's property and
equipment (primarily towers, construction equipment and vehicles), goodwill
and other intangible assets recorded in connection with business acquisitions.
Depreciation of towers and amortization of goodwill are computed with a useful
life of 20 years. Amortization of other intangible assets (principally the
value of existing site rental contracts at Crown) is computed with a useful
life of 10 years. Depreciation of construction equipment and vehicles are
generally computed with useful lives of 10 years and 5 years, respectively.
 
  The following information is derived from the Company's Consolidated
Statements of Operations for the periods indicated.
 
<TABLE>
<CAPTION>
                              YEAR ENDED            YEAR ENDED        NINE MONTHS ENDED      NINE MONTHS ENDED
                          DECEMBER 31, 1995     DECEMBER 31, 1996     SEPTEMBER 30, 1996    SEPTEMBER 30, 1997
                          --------------------  --------------------  --------------------- ----------------------
                                      PERCENT               PERCENT               PERCENT                PERCENT
                                      OF NET                OF NET                OF NET                 OF NET
                           AMOUNT    REVENUES    AMOUNT    REVENUES    AMOUNT    REVENUES    AMOUNT     REVENUES
                          ---------  ---------  ---------  ---------  ---------  ---------- ----------  ----------
                                                     (DOLLARS IN THOUSANDS)
<S>                       <C>        <C>        <C>        <C>        <C>        <C>        <C>         <C>
Net revenues:
 Site rental............  $   4,052      99.9%  $   5,615       90.5% $   4,001       92.9% $    6,743      34.7%
 Network services and
  other.................          6       0.1         592        9.5        304        7.1      12,668      65.3
                          ---------   -------   ---------   --------  ---------   --------  ----------   -------
  Total net revenues....      4,058     100.0       6,207      100.0      4,305      100.0      19,411     100.0
                          ---------   -------   ---------   --------  ---------   --------  ----------   -------
Operating expenses:
 Costs of operations:
 Site rental............      1,226      30.3       1,292       23.0        937       23.4       1,422      21.1
 Network services and
  other.................        --        --            8        1.4        --         --        7,187      56.7
                          ---------             ---------             ---------             ----------
  Total costs of
   operations...........      1,226      30.2       1,300       21.0        937       21.8       8,609      44.3
 General and
  administrative........        729      18.0       1,678       27.0      1,211       28.1       3,841      19.8
 Corporate development..        204       5.0       1,324       21.3        716       16.6       4,654      24.0
 Depreciation and
  amortization..........        836      20.6       1,242       20.0        868       20.2       3,295      17.0
                          ---------   -------   ---------   --------  ---------   --------  ----------   -------
Operating income
 (loss).................      1,063      26.2         663       10.7        573       13.3        (988)     (5.1)
Other income (expense):
 Equity in losses of
  unconsolidated
  affiliate.............        --        --          --         --         --         --       (1,189)     (6.1)
 Interest and other
  income................         53       1.3         193        3.1        101        2.3         441       2.3
 Interest expense and
  amortization of
  deferred financing
  costs.................     (1,137)    (28.0)     (1,803)     (29.0)    (1,229)     (28.5)     (4,368)    (22.5)
                          ---------   -------   ---------   --------  ---------   --------  ----------   -------
Income (loss) before
 income taxes...........        (21)     (0.5)       (947)     (15.2)      (555)     (12.9)     (6,104)    (31.4)
Provision for income
 taxes..................        --        --          (10)      (0.2)       --         --          (46)     (0.3)
                          ---------   -------   ---------   --------  ---------   --------  ----------   -------
Net income (loss).......  $     (21)    (0.5)%  $    (957)    (15.4)% $    (555)    (12.9)% $   (6,150)    (31.7)%
                          =========   =======   =========   ========  =========   ========  ==========   =======
</TABLE>
 
 Comparison of Nine Months Ended September 30, 1997 and 1996
 
  Consolidated revenues for the nine months ended September 30, 1997 were
$19.4 million, an increase of $15.1 million from the nine months ended
September 30, 1996. This increase was primarily attributable to (i) a $2.7
million, or 68.5%, increase in site rental revenues, of which $1.6 million was
attributable to the Crown
 
                                      42
<PAGE>
 
operations and $0.7 million was attributable to the Puerto Rico operations;
(ii) $7.0 million in network services revenues from TEA; (iii) $2.9 million in
network services revenues from the Crown operations; and (iv) a $1.2 million
fee received in March 1997 as compensation for leading the investment
consortium which provided the equity financing for CTI, the impact on earnings
of which was partially offset by certain executive bonuses related to the CTI
Investment and included in corporate development expenses. The remainder of
the increase was primarily attributable to higher revenues from SMR and
microwave radio services in Puerto Rico and the monthly service fees received
from CTI beginning in March 1997.
 
  Costs of operations for the nine months ended September 30, 1997 were $8.6
million, an increase of $7.7 million from the nine months ended September 30,
1996. This increase was primarily attributable to (i) $5.5 million of network
services costs related to the TEA operations; (ii) $1.3 million of network
services costs related to the Crown operations; and (iii) $0.5 million in site
rental costs, of which $0.4 million was attributable to the Crown operations.
Costs of operations for site rental as a percentage of site rental revenues
decreased to 21.1% for the nine months ended September 30, 1997 from 23.4% for
the nine months ended September 30, 1996 because of increased utilization of
the towers located in the southwestern United States and Puerto Rico. Costs of
operations for network services as a percentage of network services revenues
were 56.7% for the nine months ended September 30, 1997, reflecting lower
margins that are inherent in the network services businesses acquired in 1997.
 
  General and administrative expenses for the nine months ended September 30,
1997 were $3.8 million, an increase of $2.6 million from the nine months ended
September 30, 1996. This increase was primarily attributable to $1.2 million
of expenses related to the Crown operations and $0.9 million of expenses
related to the TEA operations, along with an increase in costs of $0.1 million
at the Company's corporate office. General and administrative expenses as a
percentage of revenues decreased for the nine months ended September 30, 1997
to 19.8% from 28.1% for the nine months ended September 30, 1996 because of
lower overhead costs as a percentage of revenues for Crown and TEA.
 
  Corporate development expenses for the nine months ended September 30, 1997
were $4.7 million, an increase of $3.9 million from the nine months ended
September 30, 1996. A substantial portion of this increase was attributable to
nonrecurring compensation charges associated with the CTI Investment of
(i) $0.9 million for certain executive bonuses and (ii) the repurchase of
shares of the Company's common stock from a member of its Board of Directors,
which resulted in compensation charges of $1.3 million. The remaining $1.7
million of the increase in corporate development expenses was attributable to
a higher allocation of personnel costs, along with an overall increase in such
costs, associated with an increase in acquisition and business development
activities.
   
  Depreciation and amortization for the nine months ended September 30, 1997
was $3.3 million, an increase of $2.4 million from the nine months ended
September 30, 1996. This increase was primarily attributable to (i) $1.8
million of depreciation and amortization related to the property and
equipment, goodwill and other intangible assets acquired in the Crown Merger;
(ii) $0.3 million of depreciation and amortization related to the property and
equipment and goodwill acquired in the TEA and TeleStructures Acquisitions;
and (iii) $0.3 million resulting from nine months of depreciation related to
the property and equipment acquired in the Puerto Rico Acquisition.     
   
  The equity in losses of unconsolidated affiliate of $1.2 million represents
the Company's 34.3% share of CTI's net loss for the period from March through
September 1997. After making appropriate adjustments to CTI's results of
operations for such period to conform to generally accepted accounting
principles of the United States, CTI had net revenues, operating income,
interest expense (including amortization of deferred financing costs) and net
losses of $70.9 million, $11.4 million, $15.3 million and $3.5 million,
respectively.     
 
  Interest and other income for the nine months ended September 30, 1997
resulted primarily from the investment of excess proceeds from the sale of the
Company's Series C Convertible Preferred Stock in February 1997.
 
  Interest expense and amortization of deferred financing costs for the nine
months ended September 30, 1997 were $4.4 million, an increase of $3.1
million, or 255.4%, from the nine months ended September 30, 1996. This
increase was primarily attributable to (i) interest on notes payable to the
former stockholders of Crown for
 
                                      43
<PAGE>
 
a portion of the purchase price of the Crown Business; (ii) commitment fees
related to an unfunded interim loan facility related to the Crown Merger;
(iii) interest on borrowings under the Company's bank credit facility which
were used to finance the acquisition of the Puerto Rico System; and (iv)
interest on outstanding borrowings assumed in connection with the Crown
Merger.
 
 Comparison of Years Ended December 31, 1996 and 1995
 
  Consolidated revenues for 1996 were $6.2 million, an increase of $2.1
million, or 53.0%, from 1995. This increase was primarily attributable to (i)
$0.6 million in site rental revenues attributable to the Puerto Rico
operations; (ii) $0.6 million in site rental revenues resulting from the
effect of a full year's activity for the operations of Spectrum (which was
acquired in October 1995); (iii) an increase in site rental revenues of $0.3
million, or 6.9%, from the towers acquired from PCI; and (iv) $0.5 million in
SMR and microwave radio services revenues attributable to the Puerto Rico
operations.
 
  Costs of operations for 1996 were $1.3 million, an increase of $0.1 million,
or 6.0%, from 1995. Additional costs in 1996 of $0.3 million attributable to
the Puerto Rico operations were largely offset by decreased costs of $0.2
million associated with the towers acquired from PCI. Such towers were managed
by PCI during 1995 under an agreement with the Company, and the management
fees charged to the Company amounted to $0.6 million. The Company began
managing the towers on January 1, 1996. As a result of these factors, costs of
operations as a percentage of revenues decreased to 21.0% in 1996 from 30.2%
in 1995.
 
  General and administrative expenses for 1996 were $1.7 million, an increase
of $0.9 million from 1995. This increase was primarily attributable to costs
of $0.5 million and $0.1 million associated with the Spectrum and Puerto Rico
Acquisitions, respectively, along with an increase in costs of $0.3 million,
or 41.7%, at the Company's corporate office. General and administrative
expenses at the Company's corporate office increased because of additional
personnel costs and higher overhead resulting from the Company's internal
management of the PCI towers beginning in 1996. As a result of these factors,
general and administrative expenses as a percentage of revenues increased to
27.0% in 1996 from 18.0% in 1995.
 
  Corporate development expenses for 1996 were $1.3 million, an increase of
$1.1 million from 1995. This increase was primarily attributable to a higher
allocation of personnel costs, along with an overall increase in such costs
associated with an increase in acquisition and business development activities
during the last half of 1996.
 
  Depreciation and amortization for 1996 was $1.2 million, an increase of $0.4
million from 1995. This increase was primarily associated with depreciation
associated with towers purchased in the Puerto Rico Acquisition and goodwill
created in the Spectrum Acquisition.
 
  Interest and other income for 1996 was $0.2 million, an increase of $0.1
million from 1995, primarily resulting from the investment of excess proceeds
from the sale of the Company's Series B Convertible Preferred Stock in July
1996. Interest expense and amortization of deferred financing costs for 1996
were $1.8 million, an increase of $0.7 million, or 58.6%, from 1995, primarily
resulting from borrowings under the Company's bank credit agreement which were
used to finance the Puerto Rico Acquisition.
 
 Crown
 
  Crown's primary sources of revenues are from (i) the rental of antennae
space on towers and rooftop sites and (ii) the provision of network services,
which includes site selection and acquisition, antennae installation, site
development and construction and network design. Site rental revenues are
received primarily from wireless communications companies, including cellular,
PCS, paging, SMR/ESMR and microwave operators. Site rental revenues are
generally recognized on a monthly basis under lease agreements, which
typically have original terms of five years (with three or four optional
renewal periods of five years each). Such lease agreements generally include
term extension and rental rate escalation provisions. Average monthly site
rental revenues per owned site have increased from approximately $7,400 in
1995 to approximately $12,500 as of September 30, 1997.
 
  Network services revenues consist of revenues from (i) site selection and
acquisition, (ii) site development, construction and antennae installation and
(iii) other services. Network services revenues are received primarily
 
                                      44
<PAGE>
 
from wireless communications companies. Such revenues are recognized under
service contracts which provide for billings on either a fixed price basis or
a time and materials basis. Larger network services contracts are generally
billed on a fixed price basis. Demand for Crown's network services fluctuates
from period to period and within periods. These fluctuations are caused by a
number of factors, including the timing of customers' capital expenditures,
annual budgetary considerations of customers, the rate and volume of wireless
communications carriers' tower build-outs, timing of existing customer
contracts and general economic conditions. While such demand fluctuates, Crown
must incur certain costs, such as maintaining a staff of network services
employees in anticipation of future contracts, even when there may be no
current business. Consequently, the operating results of Crown's network
services businesses for any particular period may vary significantly, and
should not be considered as necessarily being indicative of longer-term
results.
 
  Costs of operations for site rental primarily consist of rental payments on
managed sites, land leases, repairs and maintenance, utilities, insurance,
property taxes and monitoring costs. For any given tower, such costs are
relatively fixed over a monthly or an annual time period. As such, operating
costs for owned towers do not generally increase significantly as additional
customers are added. However, rental expenses at certain managed towers
increase as additional customer antennae are added, resulting in higher
incremental revenues but lower incremental margins than on owned towers. Costs
of operations for network services consist primarily of employee compensation
and related benefits costs, subcontractor services, consulting fees, and other
on-site construction and materials costs.
 
  General and administrative expenses consist primarily of employee
compensation and related benefits costs, advertising, professional and
consulting fees, office rent and related expenses, travel costs and business
development costs.
 
  Depreciation and amortization charges relate to Crown's property and
equipment (primarily towers, construction equipment and vehicles).
Depreciation of towers, construction equipment and vehicles are generally
computed with useful lives of 20 years, 10 years and 5 years, respectively.
 
  Prior to their acquisition by the Company, the Crown Business was organized
as a sole proprietorship and two Subchapter S corporations under the Internal
Revenue Code. As such, no provision for income taxes has been made in Crown's
Combined Statements of Income.
 
  The following information is derived from Crown's Combined Statements of
Income for the periods indicated.
 
<TABLE>
<CAPTION>
                              YEAR ENDED            YEAR ENDED        SIX MONTHS ENDED  SIX MONTHS ENDED
                          DECEMBER 31, 1995     DECEMBER 31, 1996      JUNE 30, 1996     JUNE 30, 1997
                          --------------------  --------------------  ----------------- -----------------
                                      PERCENT               PERCENT            PERCENT           PERCENT
                                      OF NET                OF NET              OF NET            OF NET
                           AMOUNT    REVENUES    AMOUNT    REVENUES   AMOUNT   REVENUES AMOUNT   REVENUES
                          ---------  ---------  ---------  ---------  -------  -------- -------  --------
                                                  (DOLLARS IN THOUSANDS)
<S>                       <C>        <C>        <C>        <C>        <C>      <C>      <C>      <C>
Net revenues:
 Site rental............  $   3,632      33.0%  $   5,120      26.4%  $ 2,239    27.3%  $ 3,815    24.1%
 Network services and
  other.................      7,384      67.0      14,260      73.6     5,950    72.7    12,022    75.9
                          ---------   -------   ---------   -------   -------   -----   -------   -----
  Total net revenues....     11,016     100.0      19,380     100.0     8,189   100.0    15,837   100.0
                          ---------   -------   ---------   -------   -------   -----   -------   -----
Operating expenses:
 Costs of operations:
 Site rental............        763      21.0       1,691      33.0       600    26.8     1,150    30.1
 Network services and
  other.................      3,944      53.4       8,632      60.5     3,877    65.2     5,138    42.7
                          ---------             ---------             -------           -------
  Total costs of
   operations...........      4,707      42.7      10,323      53.3     4,477    54.7     6,288    39.7
 General and
  administrative........      2,625      23.8       3,150      16.2     1,163    14.2     3,163    20.0
 Depreciation and
  amortization..........        568       5.2       1,168       6.0       452     5.5       842     5.3
                          ---------   -------   ---------   -------   -------   -----   -------   -----
Operating income........      3,116      28.3       4,739      24.5     2,097    25.6     5,544    35.0
Other income (expense):
 Interest and other
  income (expense)......         19       0.1         (53)     (0.3)       (8)   (0.1)      (29)   (0.2)
 Interest expense.......       (785)     (7.1)     (1,175)     (6.1)     (526)   (6.4)     (774)   (4.9)
                          ---------   -------   ---------   -------   -------   -----   -------   -----
Income before income
 taxes..................      2,350      21.3       3,511      18.1     1,563    19.1     4,741    29.9
Provision for income
 taxes..................        --        --          --        --        --      --        --      --
                          ---------   -------   ---------   -------   -------   -----   -------   -----
Net income..............  $   2,350      21.3%  $   3,511      18.1%  $ 1,563    19.1%  $ 4,741    29.9%
                          =========   =======   =========   =======   =======   =====   =======   =====
</TABLE>
 
                                      45
<PAGE>
 
 Comparison of Six Months Ended June 30, 1997 and 1996
 
  Revenues for the six months ended June 30, 1997 were $15.8 million, an
increase of $7.6 million, or 93.4%, from the six months ended June 30, 1996.
This increase was primarily attributable to (i) an increase of $1.6 million,
or 70.4%, in site rental revenues and (ii) an increase of $6.1 million, or
102.1%, in network services revenues. The increase in site rental revenues
resulted from the addition of 4 owned towers and 2 managed towers between June
30, 1996 and 1997, along with an increase in the average number of tenants per
tower and increases in monthly site rental rates. The total number of lease
contracts at owned towers increased from 508 to 799, or 57.3%, between June
30, 1996 and 1997, while the total number of lease contracts at managed towers
increased from 47 to 112, or 138.3%, for the same period. The average number
of tenants per owned and managed tower increased 9% and 50%, respectively, for
such period, while monthly customer rental rates generally increased by 3%.
The increase in network services revenues was primarily attributable to major
contracts for site development, construction and antennae installation in
connection with a partial build-out of two carriers' networks in the greater
Pittsburgh area. Revenues from these two contracts amounted to approximately
$6.5 million for the six months ended June 30, 1997.
 
  Costs of operations for the six months ended June 30, 1997 were $6.3
million, an increase of $1.8 million, or 40.5%, from the six months ended June
30, 1996. This increase was primarily attributable to (i) an increase of $0.6
million, or 91.7%, in site rental costs and (ii) an increase of $1.3 million,
or 32.5%, in network services costs. The increase in site rental costs
resulted from (i) the additional owned and managed towers discussed above and
(ii) an increase in rental expenses for space leased by Crown for sublease on
managed towers resulting from the substantial increase in tenants at such
sites. Site rental operating costs as a percentage of site rental revenues
increased to 30.1% for the six months ended June 30, 1997 from 26.8% for the
six months ended June 30, 1996 because of a larger increase in leasing
activity at managed sites than at owned sites. The increase in network
services costs was primarily related to the two major contracts mentioned
above. As a result of the higher margins associated with these two contracts,
costs of network services as a percentage of network services revenues
decreased to 42.7% for the six months ended June 30, 1997 from 65.2% for the
six months ended June 30, 1996.
 
  General and administrative expenses for the six months ended June 30, 1997
were $3.2 million, an increase of $2.0 million from the six months ended June
30, 1996. This increase was primarily attributable to higher personnel and
overhead costs associated with the hiring of new employees to prepare for an
expected increase in the rate of construction of new towers.
 
  Depreciation and amortization for the six months ended June 30, 1997 were
$0.8 million, an increase of $0.4 million from the six months ended June 30,
1996. This increase was primarily associated with the additional towers
discussed above.
 
  Interest expense for the six months ended June 30, 1997 was $0.8 million, an
increase of $0.2 million from the six months ended June 30, 1996. This
increase was primarily attributable to borrowings under Crown's bank credit
facility, which were used to finance the construction of new towers.
 
 Comparison of Years Ended December 31, 1996 and 1995
 
  Revenues for 1996 were $19.4 million, an increase of $8.4 million, or 75.9%,
from 1995. This increase was primarily attributable to (i) an increase of $1.5
million, or 41.0%, in site rental revenues and (ii) an increase of $6.9
million, or 93.1%, in network services revenues. The increase in site rental
revenues resulted from the addition of 8 owned towers and 5 managed towers
between December 31, 1995 and 1996, along with an increase in the average
number of tenants per site and increases in monthly site rental rates. The
total number of lease contracts at owned towers increased from 416 to 641, or
54.1%, between December 31, 1995 and 1996, while the total number of lease
contracts at managed towers increased from 31 to 72, or 132.3%, for the same
period. The average number of tenants per both owned and managed towers
increased 10% for such period, while monthly customer rental rates generally
increased by 3%. The increase in network services revenues was primarily
attributable to two major contracts with wireless communications carriers in
1996. The first contract
 
                                      46
<PAGE>
 
was for deployment of wireless infrastructure through the Metropolitan Atlanta
Rail Transit Authority ("MARTA") system for the 1996 Summer Olympics in
Atlanta. Revenues from this contract amounted to approximately $2.6 million in
1996. The second contract was to build out a carrier's network in the greater
Pittsburgh area. Revenues from this contract amounted to approximately $3.4
million in 1996.
 
  Costs of operations for 1996 were $10.3 million, an increase of $5.6
million, or 119.3%, from 1995. This increase was primarily attributable to (i)
an increase of $0.9 million, or 121.6%, in site rental costs and (ii) an
increase of $4.7 million, or 118.9%, in network services costs. The increase
in site rental costs resulted from (i) the additional owned and managed towers
discussed above; (ii) nonrecurring charges for repairs and maintenance of $0.6
million; and (iii) an increase in rental expenses for space leased by Crown
for sublease on managed towers resulting from the increase in tenants at such
sites. Site rental operating costs as a percentage of site rental revenues
increased to 33.0% in 1996 from 21.0% in 1995, primarily due to the
nonrecurring repairs and maintenance charges. The increase in network services
costs was primarily related to the two major contracts discussed above. Costs
of network services as a percentage of network services revenues increased to
60.5% for 1996 from 53.4% for 1995, primarily due to lower realized margins on
contracts other than the two mentioned above.
 
  General and administrative expenses for 1996 were $3.2 million, an increase
of $0.5 million, or 20.0%, from 1995. This increase was primarily attributable
to higher personnel and overhead costs associated with the hiring of new
employees.
 
  Depreciation and amortization for 1996 was $1.2 million, an increase of $0.6
million from 1995. This increase was primarily associated with the additional
towers discussed above.
 
  Interest expense for 1996 was $1.2 million, an increase of $0.4 million from
1995. This increase was primarily attributable to borrowings under Crown's
bank credit facility which were used to finance the construction of new
towers.
 
UNAUDITED SUPPLEMENTAL COMBINED ADJUSTED RESULTS OF OPERATIONS
 
  The historical financial statements included elsewhere herein do not reflect
the results of operations of the businesses of CCIC and Crown (the
"Businesses") on an aggregate basis for all the periods presented. As a
result, management believes that the historical financial statements included
elsewhere herein do not, by themselves, provide investors with sufficient
information to adequately assess the trends of the Businesses over the periods
indicated. The Company is providing additional information, therefore, to
supplement the historical financial information included elsewhere herein to
assist prospective investors in evaluating the Businesses' historical results
of operations.
   
  The unaudited supplemental combined adjusted financial data set forth below
have been derived from the historical results of operations of CCIC which
include the results of operations for each acquired business (including Crown)
from the respective date of its acquisition by CCIC, and are adjusted to
include the pre-acquisition results of operations for each of the acquired
businesses from the beginning of the period presented to its respective
acquisition date. See "Unaudited Pro Forma Condensed Consolidated Financial
Statements." The unaudited supplemental combined adjusted financial data do
not purport to present the combined results of operations that the Businesses
would have achieved had they been under common ownership and control during
such periods, nor are they indicative of the results of operations that may be
achieved in the future. The acquisitions of the acquired businesses (including
Crown) by CCIC resulted in new bases of accounting whereby the assets and
liabilities of the acquired businesses were adjusted to their fair values on
their respective dates of acquisition pursuant to Accounting Principles Board
Opinion No. 16. To the extent such adjustments resulted in charges to
depreciation and amortization expense, such charges do not enter into the
determination of costs of operations or gross margin.     
 
                                      47
<PAGE>
 
<TABLE>   
<CAPTION>
                                     YEARS ENDED     NINE MONTHS ENDED
                                     DECEMBER 31,      SEPTEMBER 30,
                                   ----------------  ------------------
                                      ADJUSTED         ADJUSTED (A)
                                   ----------------  ------------------
                                    1995     1996      1996      1997
                                   -------  -------  --------  --------
                                            (DOLLARS IN THOUSANDS)
<S>                                <C>      <C>      <C>       <C>     
STATEMENT OF OPERATIONS DATA:
Net revenues:
 Site rental.....................  $ 9,425  $11,356  $  8,256  $ 11,293
 Network services and other......   32,365   34,124    22,881    32,399
                                   -------  -------  --------  --------
 Total net revenues..............  $41,790  $45,480  $ 31,137  $ 43,692
                                   =======  =======  ========  ========
Costs of operations:
 Site rental.....................  $ 2,372  $ 3,206  $  2,297  $  2,843
 Network services and other......   22,807   23,276    16,506    19,356
                                   -------  -------  --------  --------
 Total costs of operations.......  $25,179  $26,482  $ 18,803  $ 22,199
                                   =======  =======  ========  ========
Gross margin:
 Site rental.....................  $ 7,053  $ 8,150  $  5,959  $  8,450
 Network services and other......    9,558   10,848     6,375    13,043
                                   -------  -------  --------  --------
 Total gross margin..............  $16,611  $18,998  $ 12,334   $21,493
                                   =======  =======  ========  ========
Gross margin as a percentage of
 net revenues:
 Site rental.....................     74.8%    71.8%     72.2%     74.8%
 Network services and other......     29.5%    31.8%     27.9%     40.3%
 Total gross margin..............     39.7%    41.8%     39.6%     49.2%
</TABLE>    
- --------
(a) Excludes the efforts of certain borrowing transactions associated with the
    CTI Investments. See "Unaudited Pro Forma Condensed Consolidated Financial
    Statements."
       
       
 Comparison of Nine Months Ended September 30, 1997 and 1996
 
  Revenues for the nine months ended September 30, 1997 were $43.7 million, an
increase of $12.6 million, or 40.3%, from the nine months ended September 30,
1996. This increase was primarily attributable to (i) an increase of $3.0
million, or 36.8%, in site rental revenues and (ii) an increase of $9.6
million, or 41.6%, in network services and other revenues. The increase in
site rental revenues resulted primarily from the addition of 10 owned sites
and 2 managed sites between September 30, 1996 and 1997, along with an
increase in the average number of tenants per site and increases in site
rental rates. The increase in network services revenues was primarily
attributable to major contracts for site development, construction and
antennae installation in connection with a partial build-out of two carriers'
networks in the greater Pittsburgh area. Revenues from these two contracts
amounted to approximately $7.9 million for the nine months ended September 30,
1997. Revenues from network services at TEA increased by $1.7 million for the
same period.
 
  Costs of operations for the nine months ended September 30, 1997 were $22.2
million, an increase of $3.4 million, or 18.1%, from the nine months ended
September 30, 1996. This increase was primarily attributable to (i) an
increase of $0.5 million, or 23.8%, in site rental costs and (ii) an increase
of $2.9 million, or 17.3%, in network services costs. The increase in site
rental costs resulted primarily from the additional owned and managed towers
discussed above. Site rental operating costs as a percentage of site rental
revenues decreased to 25.2% for the nine months ended September 30, 1997 from
27.8% for the nine months ended September 30, 1996. The increase in network
services costs was primarily related to (i) the two major contracts mentioned
 
                                      48
<PAGE>
 
above and (ii) an increase in site selection and acquisition costs of $1.5
million. As a result of the higher margins associated with these two contracts
and increased site selection and acquisition costs, costs of network services
as a percentage of network services revenues decreased to 59.7% for the nine
months ended September 30, 1997 from 72.1% for the nine months ended September
30, 1996.
       
 Discussion of Three Months Ended September 30, 1997
 
  The Company's results of operations for the three months ended September 30,
1997 were below the level of the prior two quarters. The following discussion
compares the results of operations for the three months ended September 30,
1997 with the six months ended June 30, 1997.
 
  Revenues for the three months ended September 30, 1997 were $13.3 million,
as compared to revenues of $30.4 million for the six months ended June 30,
1997. Site rental revenues for the three months ended September 30, 1997 were
$4.1 million, as compared to site rental revenues for the six months ended
June 30, 1997 of $7.2 million. Network services and other revenues for the
three months ended September 30, 1997 were $9.2 million, as compared to $23.2
million for the six months ended June 30, 1997. The decline in network
services and other revenues was primarily due to lower revenues from the
projects related to the two major network services contracts discussed above.
See "Risk Factors--Variability in Quarterly and Annual Performance." Exclusive
of revenues from these projects, network services and other revenues amounted
to $7.8 million for the three months ended September 30, 1997, as compared to
$16.7 million for the six months ended June 30, 1997. The balance of the
decline in network services revenues for the third quarter of 1997 relative to
the six months ended June 30, 1997 was primarily due to lower revenues at TEA.
 
  Costs of operations for the three months ended September 30, 1997 were $6.8
million, as compared to costs of operations of $15.4 million for the six
months ended June 30, 1997. Costs of operations for site rentals for the three
months ended September 30, 1997 were $1.1 million, as compared to costs of
operations for site rentals for the six months ended June 30, 1997 of $1.7
million. Costs of operations for network services and other for the three
months ended September 30, 1997 were $5.7 million as compared to costs of
operations for network services and other for the six months ended June 30,
1997 of $13.7 million. Due to the higher margins associated with the two major
network services contracts discussed above, costs of network services as a
percentage of network services revenues increased to 62.2% for the three
months ended September 30, 1997 as compared to 58.8% for the six months ended
June 30, 1997.
       
 Comparison of Years Ended December 31, 1996 and 1995
   
  Revenues for 1996 were $45.5 million, an increase of $3.7 million, or 8.8%,
from the prior year. This increase was primarily attributable to (i) an
increase of $1.9 million, or 20.5%, in site rental revenues and (ii) an
increase of $1.8 million, or 5.4%, in network services revenues. The increase
in site rental revenues resulted primarily from the addition of 8 owned sites
and 5 managed sites between December 31, 1995 and 1996, along with an increase
in the average number of tenants per site and increases in site rental rates.
The increase in network services revenues was primarily attributable to two
major contracts with wireless carriers in 1996. The first contract was for
deployment of wireless infrastructure through the MARTA system for the 1996
Summer Olympics in Atlanta. Revenues from this contract amounted to
approximately $2.6 million in 1996. The second contract was to build out a
carrier's network in the Pittsburgh area. Revenues from this contract amounted
to approximately $3.4 million in 1996. Revenues from network services at TEA
decreased by $5.3 million for 1996 due to decreased effectiveness of sales and
marketing initiatives by senior management.     
 
  Costs of operations for 1996 were $26.5 million, an increase of $1.3
million, or 5.2%, from 1995. This increase was primarily attributable to (i)
an increase of $0.8 million, or 35.2%, in site rental costs; (ii) an increase
of $0.5 million, or 2.1%, in network services costs. The increase in site
rental costs resulted from (i) the additional owned and managed towers
discussed above; (ii) nonrecurring charges for repairs and maintenance of $0.6
million; and (iii) an increase in rental expenses for space leased by the
Company for sublease on managed towers resulting from the increase in tenants
at such sites. Site rental operating costs as a percentage of site rental
 
                                      49
<PAGE>
 
revenues increased to 28.2% for 1996 from 25.2% in 1995, primarily due to the
nonrecurring repairs and maintenance charges. The increase in network services
costs was primarily related to the two major contracts mentioned above, offset
in part by a decrease in site selection and acquisition costs of $4.2 million.
Costs of network services as a percentage of network services revenues
decreased to 68.2% for 1996 from 70.5% for 1995.
       
LIQUIDITY AND CAPITAL RESOURCES
 
  On a pro forma basis, as of September 30, 1997, after giving effect to the
Refinancing, the Company would have had consolidated cash and cash equivalents
of $60.3 million, consolidated long-term debt of $150.0 million, invested
capital from the issuance of its redeemable preferred stock of $159.0 million
and consolidated stockholders' equity of $46.7 million.
   
  For the years ended December 31, 1995 and 1996 and the nine months ended
September 30, 1997, the Company's net cash provided by (used for) operating
activities was $1.7 million, ($0.5 million) and ($2.1 million), respectively.
Since its inception, the Company has generally funded its activities (other
than its acquisitions and investments) through excess proceeds from
contributions of equity capital. The Company has financed its acquisitions and
investments with the proceeds from equity contributions, borrowings under its
bank credit facility and the issuance of promissory notes to sellers.     
 
  On a pro forma basis, capital expenditures (excluding acquisitions) were
$9.7 million for the year ended December 31, 1996 (of which $1.0 million was
for CCIC and TEA and $8.7 million was for Crown) and $17.7 million for the
nine months ended September 30, 1997 (of which $5.3 million was for CCIC and
$12.4 million was for Crown).
 
  In August and October of 1997, the Company issued shares of its Senior
Convertible Preferred Stock for aggregate net proceeds of $29.3 million and
$36.5 million, respectively. The proceeds from the August issuance were used
to make a $25.0 million payment as part of the cash purchase price for the
Crown Merger. On October 31, 1997, the Company entered into an amendment to
the Senior Credit Facility. As amended, the Senior Credit Facility provides
for available borrowings of $100.0 million and expires on December 31, 2004.
On October 31, 1997, in connection with the October Refinancing, new
borrowings under the Senior Credit Facility of $94.7 million, along with the
proceeds from the October issuance of the Senior Convertible Preferred Stock,
were used to repay the Seller Note, to repay loans outstanding under a credit
agreement at Crown Communication and to pay related fees and expenses. The
Senior Credit Facility requires the Company to maintain certain financial
covenants and places restrictions on the ability of the Company and its
subsidiaries to, among other things, incur debt and liens, pay dividends, make
capital expenditures, undertake transactions with affiliates and make
investments.
 
  The Company used the net proceeds from the Offering of the Old Notes to
repay substantially all of its outstanding indebtedness, including borrowings
under the Senior Credit Facility, and to pay related fees and expenses. The
balance of the net proceeds from the Offering of the Old Notes is being used
for general corporate purposes. As of January 5, 1998, the Company and its
subsidiaries had unused borrowing availability under the Senior Credit
Facility of approximately $85.3 million. See "Use of Proceeds."
 
  The Company and its subsidiaries expect to use the borrowing availability
under the Senior Credit Facility, together with a portion of the net proceeds
from the Offering of the Old Notes, to fund the execution of the Company's
business plan. The Company's business strategy contemplates substantial
capital expenditures in connection with the expansion of its tower footprints.
The exact amount of the Company's future capital expenditures, however, will
depend upon a number of factors. Pursuant to the Nextel Agreement, the Company
has exercised an option to acquire 50 towers from Nextel in the first quarter
of 1998 for an aggregate purchase price of approximately $14.4 million. In
addition, pursuant to the Nextel Agreement, the Company has the exclusive
right and option to construct up to 250 new towers within selected markets
(and along parts of certain interstate highway corridors) with Nextel as the
anchor tenant. The Company currently anticipates that it will
 
                                      50
<PAGE>
 
build approximately 100 of the 250 towers in 1998 for an aggregate amount of
approximately $20.0 million, and the Company currently expects to expend
similar amounts in 1999. The Company also intends to continue to explore other
opportunities to build and acquire additional towers. Whether the Company
utilizes the Senior Credit Facility to finance the Nextel build-out and/or to
finance such other opportunities will depend upon a number of factors,
including (i) the attractiveness of the opportunities, (ii) the time frame in
which they are identified, (iii) the number of pre-existing projects to which
the Company is committed and (iv) the Company's liquidity at the time of any
potential opportunity. In the event borrowings under the Senior Credit
Facility have otherwise been utilized when an opportunity arises (including
additional Nextel build-out opportunities), and the Company does not otherwise
have cash available (from the net proceeds of the Offering of the Old Notes or
otherwise), the Company would be forced to seek additional debt or equity
financing or to forego the opportunity. In the event the Company determines to
seek additional debt or equity financing, there can be no assurance that any
such financing will be commercially available or permitted by the terms of the
Company's existing indebtedness. To the extent the Company is unable to
finance future capital expenditures, it will be unable to achieve its
currently contemplated business strategy.
 
  Prior to May 15, 2003, the Company's interest expense on the Notes will be
comprised solely of the accretion of original issue discount. Thereafter, the
Notes will require annual cash interest payments of approximately $26.7
million. In addition, the Senior Credit Facility will require periodic
interest payments on amounts borrowed thereunder. The Company's ability to
make scheduled payments of principal of, or to pay interest on, its debt
obligations, and its ability to refinance any such debt obligations (including
the Notes), will depend on its future performance, which, to a certain extent,
is subject to general economic, financial, competitive, legislative,
regulatory and other factors that are beyond its control. As discussed above,
the Company's business strategy contemplates substantial capital expenditures
in connection with the expansion of its tower footprints. There can be no
assurance that the Company will generate sufficient cash flow from operations
in the future, that anticipated revenue growth will be realized or that future
borrowings, equity contributions or loans from affiliates will be available in
an amount sufficient to service its indebtedness and make anticipated capital
expenditures. The Company anticipates that it may need to refinance all or a
portion of its indebtedness (including the Notes) on or prior to its scheduled
maturity. There can be no assurance that the Company will be able to effect
any required refinancings of its indebtedness (including the Notes) on
commercially reasonable terms or at all. See "Risk Factors."
 
  Because of the relatively low levels of inflation experienced in 1995, 1996
and 1997, inflation did not have a significant effect on the Company's or
Crown's results in such years.
 
IMPACT OF RECENTLY ISSUED ACCOUNTING STANDARDS
 
  In February 1997, the Financial Accounting Standards Board (the "FASB")
issued Statement of Financial Accounting Standards No. 128, Earnings per Share
("SFAS 128"). SFAS 128 establishes new standards for computing and presenting
earnings per share ("EPS") amounts for companies with publicly held common
stock or potential common stock. The new standards require the presentation of
both basic and diluted EPS amounts for companies with complex capital
structures. Basic EPS is computed by dividing income available to common
stockholders by the weighted-average number of common shares outstanding for
the period, and excludes the effect of potentially dilutive securities (such
as options, warrants and convertible securities) which are convertible into
common stock. Dilutive EPS reflects the potential dilution from such
convertible securities. SFAS 128 is effective for periods ending after
December 15, 1997. The Company will adopt the requirements of SFAS 128 at such
time as it has publicly held common stock.
 
  In February 1997, the FASB issued Statement of Financial Accounting
Standards No. 129, Disclosure of Information about Capital Structure ("SFAS
129"). SFAS 129 establishes standards for disclosing information about a
company's outstanding debt and equity securities and eliminates exemptions
from such reporting requirements for nonpublic companies. SFAS 129 is
effective for periods ending after December 15, 1997. The Company has adopted
the requirements of SFAS 129 in its financial statements for the year ended
December 31, 1996.
 
                                      51
<PAGE>
 
  In June 1997, the FASB issued Statement of Financial Accounting Standards
No. 130, Reporting Comprehensive Income ("SFAS 130"). SFAS 130 establishes
standards for the reporting and display of comprehensive income in a company's
financial statements. Comprehensive income includes all changes in a company's
equity accounts (including net income or loss) except investments by, or
distributions to, the company's owners. Items which are components of
comprehensive income (other than net income or loss) include foreign currency
translation adjustments, minimum pension liability adjustments and unrealized
gains and losses on certain investments in debt and equity securities. The
components of comprehensive income must be reported in a financial statement
that is displayed with the same prominence as other financial statements. SFAS
130 is effective for fiscal years beginning after December 15, 1997. The
Company will adopt the requirements of SFAS 130 in 1998.
 
  In June 1997, the FASB issued Statement of Financial Accounting Standards
No. 131, Disclosures about Segments of an Enterprise and Related Information
("SFAS 131"). SFAS 131 establishes standards for the way that public companies
report, in their annual financial statements, certain information about their
operating segments, their products and services, the geographic areas in which
they operate and their major customers. SFAS 131 also requires that certain
information about operating segments be reported in interim financial
statements. SFAS 131 is effective for periods beginning after December 15,
1997. The Company will adopt the requirements of SFAS 131 in 1998.
 
                                      52
<PAGE>
 
                              THE EXCHANGE OFFER
 
PURPOSE OF THE EXCHANGE OFFER
 
  In connection with the sale of the Old Notes, the Company entered into the
Registration Rights Agreement with the Initial Purchasers, pursuant to which
the Company agreed to use their best efforts to file with the Commission a
registration statement with respect to the exchange of the Old Notes for a
series of registered debt securities with terms identical in all material
respects to the terms of the Old Notes, except that the New Notes have been
registered under the Securities Act and are issued free of any covenant
regarding registration, including the payment of additional interest upon a
failure to file or have declared effective and exchange offer registration
statement or to consummate the Exchange Offer by certain dates.
 
  The Company is making the Exchange Offer in reliance on the position of the
staff of the Commission as set forth in Exxon Capital Holdings Corp., SEC No-
Action Letter (April 13, 1989), Morgan Stanley & Co. Inc., SEC No-Action
Letter (June 5, 1991) and Shearman & Sterling, SEC No-Action Letter (July 2,
1993). However, the Company has not sought its own no-action letter, and there
can be no assurance that the staff of the Commission would make a similar
determination with respect to the Exchange Offer as in such other
circumstances. Based upon these interpretations by the staff of the
Commission, the Company believes that New Notes issued pursuant to this
Exchange Offer in exchange for Old Notes may be offered for resale, resold and
otherwise transferred by a holder thereof other than (i) a broker-dealer who
purchased such Old Notes directly from the Company to resell pursuant to Rule
144A or any other available exemption under the Securities Act or (ii) a
person that is an "affiliate" (as defined in Rule 405 of the Securities Act)
of the Company without compliance with the registration and prospectus
delivery provisions of the Securities Act, provided that such New Notes are
acquired in the ordinary course of such holder's business and that such holder
is not participating, and has no arrangement or understanding with any person
to participate, in the distribution of such New Notes. Holders of Old Notes
accepting the Exchange Offer will represent to the Company in the Letter of
Transmittal that such conditions have been met. Any holder who participates in
the Exchange Offer for the purpose of participating in a distribution of the
New Notes may not rely on the position of the staff of the Commission as set
forth in these no-action letters and would have to comply with the
registration and prospectus delivery requirements of the Securities Act in
connection with any secondary resale transaction. A secondary resale
transaction in the United States by a holder who is using the Exchange Offer
to participate in the distribution of New Notes must be covered by a
registration statement containing the selling securityholder information
required by Item 507 of Regulation S-K of the Securities Act.
 
  Each broker-dealer that receives New Notes for its own account pursuant to
the Exchange Offer must acknowledge that it acquired the Old Notes as a result
of market-making activities or other trading activities and will deliver a
prospectus in connection with any resale of such New Notes. This Prospectus,
as it may be amended or supplemented from time to time, may be used by a
broker-dealer in connection with resales of New Notes received in exchange for
Old Notes where such Old Notes were acquired by such broker-dealer as a result
of market-making activities or other trading activities. The Letter of
Transmittal states that by acknowledging and delivering a prospectus, a
broker-dealer will not be deemed to admit that it is an "underwriter" within
the meaning of the Securities Act. The Company has agreed that for a period of
180 days after the Expiration Date, they will make this Prospectus available
to broker-dealers for use in connection with any such resale. See "Plan of
Distribution."
 
  Except as aforesaid, this Prospectus may not be used for an offer to resell,
resale or other retransfer of New Notes.
 
  The Exchange Offer is not being made to, nor will the Company accept tenders
for exchange from, holders of Old Notes in any jurisdiction in which the
Exchange Offer or the acceptance thereof would not be in compliance with the
securities or blue sky laws of such jurisdiction.
 
TERMS OF THE EXCHANGE
 
  Upon the terms and subject to the conditions of the Exchange Offer, the
Company will, unless such Old Notes are withdrawn in accordance with the
withdrawal rights specified in "Withdrawal of Tenders" below,
 
                                      53
<PAGE>
 
accept any and all Old Notes validly tendered prior to 5:00 p.m., New York
City time, on the Expiration Date. The date of acceptance for exchange of the
Old Notes, and consummation of the Exchange Offer, is the Exchange Date, which
will be the first business day following the Expiration Date (unless extended
as described herein). The Company will issue, on or promptly after the
Exchange Date, an aggregate principal amount at maturity of up to $251,000,000
of New Notes in exchange for a like principal amount at maturity of
outstanding Old Notes tendered and accepted in connection with the Exchange
Offer. The New Notes issued in connection with the Exchange Offer will be
delivered on the earliest practicable date following the Exchange Date.
Holders may tender some or all of their Old Notes in connection with the
Exchange Offer. However, Old Notes may be tendered only in integral multiples
of $1,000.
 
  The terms of the New Notes are identical in all material respects to the
terms of the Old Notes, except that the New Notes have been registered under
the Securities Act and are issued free from any covenant regarding
registration, including the payment of additional interest upon a failure to
file or have declared effective an exchange offer registration statement or to
consummate the Exchange Offer by certain dates. The New Notes will evidence
the same debt as the Old Notes and will be issued under and be entitled to the
same benefits under the Indenture as the Old Notes. As of the date of this
Prospectus, $251,000,000 aggregate principal amount at maturity of the Old
Notes is outstanding.
 
  In connection with the issuance of the Old Notes, the Company arranged for
the Old Notes originally purchased by qualified institutional buyers to be
issued and transferable in book-entry form through the facilities of The
Depository Trust Company ("DTC"), acting as depositary. Except as described
under "Book-Entry, Delivery and Form," the New Notes will be issued in the
form of a global note registered in the name of DTC or its nominee and each
holder's interest therein will be transferable in book-entry form through DTC.
See "Book-Entry, Delivery and Form."
 
  Holders of Old Notes do not have any appraisal or dissenters' rights in
connection with the Exchange Offer. Old Notes which are not tendered for
exchange or are tendered but not accepted in connection with the Exchange
Offer will remain outstanding and be entitled to the benefits of the
Indenture, but will not be entitled to any registration rights under the
Registration Rights Agreement.
 
  The Company shall be deemed to have accepted validly tendered Old Notes
when, as and if the Company has given oral or written notice thereof to the
Exchange Agent. The Exchange Agent will act as agent for the tendering holders
for the purposes of receiving the New Notes from the Company.
 
  If any tendered Old Notes are not accepted for exchange because of an
invalid tender, the occurrence of certain other events set forth herein or
otherwise, certificates for any such unaccepted Old Notes will be returned,
without expense, to the tendering holder thereof as promptly as practicable
after the Expiration Date.
 
  Holders who tender Old Notes in connection with the Exchange Offer will not
be required to pay brokerage commissions or fees or, subject to the
instructions in the Letter of Transmittal, transfer taxes with respect to the
exchange of Old Notes in connection with the Exchange Offer. The Company will
pay all charges and expenses, other than certain applicable taxes described
below, in connection with the Exchange Offer. See "--Fees and Expenses."
 
EXPIRATION DATE; EXTENSIONS; AMENDMENTS
 
  The term "Expiration Date" shall mean 5:00 p.m., New York City time, on
  , 1998, unless extended by the Company in its sole discretion (but in no
event to a date later than        ,    ), in which case the term "Expiration
Date" shall mean the latest date and time to which the Exchange Offer is
extended.
 
  The Company reserves the right, in its sole discretion (i) to delay
accepting any Old Notes, to extend the Exchange Offer or to terminate the
Exchange Offer and to refuse to accept Old Notes not previously accepted, if
 
                                      54
<PAGE>
 
any of the conditions set forth below under "Conditions to the Exchange Offer"
shall not have been satisfied and shall not have been waived by the Company
(if permitted to be waived by the Company) and (ii) to amend the terms of the
Exchange Offer in any manner. Any such delay in acceptance, extension,
termination or amendment will be followed as promptly as practicable by oral
or written notice thereof to the registered holders. If the Exchange Offer is
amended in a manner determined by the Company to constitute a material change,
the Company will promptly disclose such amendment by means of a prospectus
supplement that will be distributed to the registered holders of the Old
Notes, and the Company will extend the Exchange Offer for a period of five to
ten business days, depending upon the significance of the amendment and the
manner of disclosure to the registered holders, if the Exchange Offer would
otherwise expire during such five to ten business day period. In no event,
however, shall the Exchange Date be later than the first business day
following       , 1998.
 
  If the Company determines to make a public announcement of any delay,
extension, amendment or termination of the Exchange Offer, the Company shall
have no obligation to publish, advertise or otherwise communicate any such
public announcement, other than by making a timely release to an appropriate
news agency.
 
INTEREST ON THE NEW NOTES
 
  The Accreted Value of the New Notes will be calculated from the original
date of issuance of the Old Notes. The New Notes will accrete daily at a rate
of 10.625% per annum, compounded semiannually, to an aggregate principal
amount of $251,000,000 by November 15, 2002. Cash interest will not accrue on
the New Notes prior to November 15, 2002. Thereafter, cash interest on the New
Notes will accrue and be payable semiannually in arrears on each May 15 and
November 15, commencing May 15, 2003, at a rate of 10.625% per annum.
 
CONDITIONS TO THE EXCHANGE OFFER
 
  Notwithstanding any other term of the Exchange Offer, the Company will not
be required to accept for exchange, or to exchange, any Old Notes for any New
Notes, and may terminate or amend the Exchange Offer before the acceptance of
any Old Notes for exchange, if:
 
    (a) any action or proceeding is instituted or threatened in any court or
  by or before any governmental agency with respect to the Exchange Offer
  which, in the Company's reasonable good faith judgment, would be expected
  to impair the ability of the Company to proceed with the Exchange Offer, or
 
    (b) any law, statute, rule or regulation is adopted or enacted, or any
  existing law, statute, rule or regulation is interpreted by the Commission
  or its staff, which, in the Company's reasonable good faith judgment, would
  be expected to impair the ability of the Company to proceed with the
  Exchange Offer.
 
  If the Company determines in its reasonable good faith judgment that any of
the foregoing conditions exist, the Company may (i) refuse to accept any Old
Notes and return all tendered Old Notes to the tendering holders, (ii) extend
the Exchange Offer and retain all Old Notes tendered prior to the expiration
of the Exchange Offer, subject, however, to the rights of holders who tendered
such Old Notes to withdraw their tendered Old Notes which have not been
withdrawn. If such waiver constitutes a material change to the Exchange Offer,
the Company will promptly disclose such waiver by means of a prospectus
supplement that will be distributed to the registered holders, and the Company
will extend the Exchange Offer for a period of five to ten business days,
depending upon the significance of the waiver and the manner of disclosure to
the registered holders, if the Exchange Offer would otherwise expire during
such five to ten business days. In no event, however, shall the Exchange Date
be a date later than the first business day following       , 1998.
 
PROCEDURES FOR TENDERING
 
  Only a holder of record of Old Notes on        , 1998 may tender such Old
Notes in connection with the Exchange Offer. To tender in connection with the
Exchange Offer, a holder must complete, sign and date the
 
                                      55
<PAGE>
 
Letter of Transmittal, or a facsimile thereof, have the signatures thereon
guaranteed if required by the Letter of Transmittal and mail or otherwise
deliver such Letter of Transmittal or such facsimile, together with the Old
Notes (unless such tender is being effected pursuant to the procedure for
book-entry transfer described below) and any other required documents, to the
Exchange Agent prior to 5:00 p.m., New York City time, on the Expiration Date.
 
  Any financial institution that is a participant in DTC's Book-Entry Transfer
Facility system may make book-entry delivery of the Old Notes by causing DTC
to transfer such Old Notes into the Exchange Agent's account in accordance
with DTC's procedure for such transfer. Although delivery of Old Notes may be
effected through book-entry transfer into the Exchange Agent's account at DTC,
the Letter of Transmittal (or facsimile thereof), with any required signature
guarantees and any other required documents, must, in any case, be transmitted
to and received or confirmed by the Exchange Agent at its addresses set forth
under the caption "Exchange Agent," below, prior to 5:00 p.m., New York City
time, on the Expiration Date. DELIVERY OF DOCUMENTS TO DTC IN ACCORDANCE WITH
ITS PROCEDURES DOES NOT CONSTITUTE DELIVERY TO THE EXCHANGE AGENT.
 
  The tender by a holder of Old Notes will constitute an agreement between
such holder and the Company in accordance with the terms and subject to the
conditions set forth herein and in the Letter of Transmittal.
 
  The method of delivery of Old Notes and the Letter of Transmittal and all
other required documents to the Exchange Agent is at the election and risk of
the holders. Instead of delivery by mail, it is recommended that holders use
an overnight or hand delivery service. In all cases, sufficient time should be
allowed to assure delivery to the Exchange Agent before the Expiration Date.
No Letter of Transmittal or Old Notes should be sent to the Company. Holders
may request their respective brokers, dealers, commercial banks, trust
companies or nominees to effect the tenders for such holders.
 
  Any beneficial owner whose Old Notes are registered in the name of a broker,
dealer, commercial bank, trust company or other nominee and who wishes to
tender should contact the registered holder promptly and instruct such
registered holder to tender on such beneficial owner's behalf. If such
beneficial owner wishes to tender on such owner's own behalf, such owner must,
prior to completing and executing the Letter of Transmittal and delivery of
such owner's Old Notes, either make appropriate arrangements to register
ownership of the Old Notes in such owner's name or obtain a properly completed
bond power from the registered holder. The transfer of registered ownership
may take considerable time.
 
  Signature on a Letter of Transmittal or a notice of withdrawal, as the case
may be, must be guaranteed by an Eligible Institution (as defined below)
unless the Old Notes tendered pursuant thereto are tendered (i) by a
registered holder who has not completed the box entitled "Special Payment
Instructions" or "Special Delivery Instructions" on the Letter of Transmittal,
or (ii) for the account of an Eligible Institution. In the event that
signatures on a Letter of Transmittal or a notice of withdrawal, as the case
may be, are required to be guaranteed, such guarantee must be by a member firm
of a registered national securities exchange or of the National Association of
Securities Dealers, Inc., a commercial bank or trust company having an office
or correspondent in the United States or an "eligible guarantor institution"
within the meaning of Rule 17Ad-15 under the Exchange Act (an "Eligible
Institution").
 
  If the Letter of Transmittal is signed by a person other than the registered
holder of any Old Notes listed therein, such Old Notes must be endorsed by
such registered holder or accompanied by a properly completed bond power, in
each case signed or endorsed in blank by such registered holder as such
registered holder's name appears on such Old Notes.
 
  If the Letter of Transmittal or any Old Notes or bond powers are signed or
endorsed by trustees, executors, administrators, guardians, attorney-in-fact,
officers of corporations or others acting in a fiduciary or representative
capacity, such persons should so indicate when signing, and unless waived by
the Company, evidence satisfactory to the Company of their authority to so act
must be submitted with the Letter of Transmittal.
 
                                      56
<PAGE>
 
  All questions as to the validity, form, eligibility (including time of
receipt) and acceptance and withdrawal of tendered Old Notes will be
determined by the Company in its sole discretion, which determination will be
final and binding. The Company reserves the absolute right to reject any and
all Old Notes not properly tendered or any Old Notes whose acceptance by the
Company would, in the opinion of U.S. counsel to the Company, be unlawful. The
Company also reserves the right to waive any defects, irregularities or
conditions of tender as to any particular Old Notes either before or after the
Expiration Date. The Company's interpretation of the terms and conditions of
the Exchange Offer (including the instructions in the Letter of Transmittal)
will be final and binding on all parties. Unless waived, any defects or
irregularities in connection with tenders of Old Notes must be cured within
such time as the Company shall determine. Although the Company intends to
request the Exchange Agent to notify holders of defects or irregularities with
respect to tenders of Old Notes, neither the Company, the Exchange Agent nor
any other person shall have any duty or incur any liability for failure to
give such notification. Tenders of Old Notes will not be deemed to have been
made until such defects or irregularities have been cured or waived. Any Old
Notes received by the Exchange Agent that are not properly tendered and as to
which the defects or irregularities have not been cured or waived will be
returned by the Exchange Agent to the tendering holders, unless otherwise
provided in the Letter of Transmittal, as soon as practicable following the
Expiration date.
 
  In addition, the Company reserves the right, as set forth above under the
caption "Conditions to the Exchange Offer," to terminate the Exchange Offer.
 
  By tendering, each holder represents to the Company that, among other
things, the New Notes acquired in connection with the Exchange Offer are being
obtained in the ordinary course of business of the person receiving such New
Notes, whether or not such person is the holder, that neither the holder nor
any such other person has an arrangement or understanding with any person to
participate in the distribution of such New Notes and that neither the holder
nor any such other person is an "affiliate" (as defined in Rule 405 under the
Securities Act) of the Company. If the holder is a broker-dealer which will
receive New Notes for its own account in exchange of Old Notes, it will
acknowledge that it acquired such Old Notes as the result of market making
activities or other trading activities and it will deliver a prospectus in
connection with any resale of such New Notes. See "Plan of Distribution."
 
GUARANTEED DELIVERY PROCEDURES
 
  Holders who wish to tender their Old Notes and (i) whose Old Notes are not
immediately available, or (ii) who cannot deliver their Old Notes, the Letter
of Transmittal or any other required documents to the Exchange Agent, or
cannot complete the procedure for book-entry transfer, prior to the Expiration
Date, may effect a tender of their Old Notes if:
 
    (a) The tender is made through an Eligible Institution;
 
    (b) Prior to the Expiration Date, the Exchange Agent received from such
  Eligible Institution a properly completed and duly executed Notice of
  Guaranteed Delivery (by facsimile transmission, mail or hand delivery)
  setting forth the name and address of the holder, the certificate number or
  numbers of such Old Notes and the principal amount of Old Notes tendered,
  stating that the tender is being made thereby and guaranteeing that, within
  five business days after the Expiration Date, the Letter of Transmittal (or
  facsimile thereof) together with the certificate or certificates
  representing the Old Notes to be tendered in proper form for transfer (or
  confirmation of a book-entry transfer into the Exchange Agent's account at
  DTC of Old Notes delivered electronically) and any other documents required
  by the Letter of Transmittal will be deposited by the Eligible Institution
  with the Exchange Agent; and
 
    (c) Such properly completed and executed Letter of Transmittal (or
  facsimile thereof) as well as the certificate or certificates representing
  all tendered Old Notes in proper form for transfer (or confirmation of a
  book-entry transfer into the Exchange Agent's account at DTC of Old Notes
  delivered electronically) and all other documents required by the Letter of
  Transmittal are received by the Exchange Agent within five business days
  after the Expiration Date.
 
                                      57
<PAGE>
 
WITHDRAWAL OF TENDERS
 
  Except as otherwise provided herein, tenders of Old Notes may be withdrawn
at any time prior to 5:00 p.m., New York City time, on the Expiration Date.
 
  To withdraw a tender of Old Notes in connection with the Exchange Offer, a
written facsimile transmission notice of withdrawal must be received by the
Exchange Agent at its address set forth herein prior to 5:00 p.m., New York
City time, on the Expiration Date. Any such notice of withdrawal must (i)
specify the name of the person who deposited the Old Notes to be withdrawn
(the "Depositor"), (ii) identify the Old Notes to be withdrawn (including the
certificate number or numbers and principal amount of such Old Notes), (iii)
be signed by the Depositor in the same manner as the original signature on the
Letter of Transmittal by which such Old Notes were tendered (including any
required signature guarantees) or be accompanied by documents of transfer
sufficient to have the trustee register the transfer of such Old Notes into
the name of the person withdrawing the tender, and (iv) specify the name in
which any such Old Notes are to be registered, if different from that of the
Depositor. All questions as to the validity, form and eligibility (including
time of receipt) of such withdrawal notices will be determined by the Company,
whose determination shall be final and binding on all parties. Any Old Notes
so withdrawn will be deemed not to have been validly tendered for purposes of
the Exchange Offer and no New Notes will be issued with respect thereto unless
Old Notes so withdrawn are validly re-tendered. Any Old Notes which have been
tendered but which are not accepted for exchange or which are withdrawn will
be returned to the holder thereof without cost to such holder as soon as
practicable after withdrawal, rejection of tender or termination of the
Exchange Offer. Properly withdrawn Old Notes may be retendered by following
one of the procedures described above under the caption "Procedures for
Tendering" at any time prior to the Expiration Date.
 
EXCHANGE AGENT
   
  United States Trust Company of New York has been appointed as Exchange Agent
in connection with the Exchange Offer. Questions and requests for assistance,
requests for additional copies of this Prospectus or of the Letter of
Transmittal should be directed to the Exchange Agent, at its offices at 770
Broadway, 13th Floor, New York, NY 10003. The Exchange Agent's telephone
number is (800) 548-6565 and facsimile number is (212) 420-6152.     
 
FEES AND EXPENSES
 
  The Company will not make any payment to brokers, dealers or others
soliciting acceptances of the Exchange Offer. The Company will pay certain
other expenses to be incurred in connection with the Exchange Offer, including
the fees and expenses of the Trustee, accounting and certain legal fees.
 
  Holders who tender their Old Notes for exchange will not be obligated to pay
any transfer taxes in connection therewith. If, however, New Notes are to be
delivered to, or are to be issued in the name of, any person other than the
registered holder of the Old Notes tendered, or if tendered Old Notes are
registered in the name of any person other than the person signing the Letter
of Transmittal, or if a transfer tax is imposed for any reason other than the
exchange of Old Notes in connection with the Exchange Offer, then the amount
of any such transfer taxes (whether imposed on the registered holder or any
other persons) will be payable by the tendering holder. If satisfactory
evidence of payment of such taxes or exemption therefrom is not submitted with
the Letter of Transmittal, the amount of such transfer taxes will be billed
directly to such tendered holder.
 
ACCOUNTING TREATMENT
 
  The New Notes will be recorded at the same carrying value as the Old Notes
as reflected in the Company's accounting records on the date of the exchange.
Accordingly, no gain or loss for accounting purposes will be recognized by the
Company upon the consummation of the Exchange Offer. Any expenses of the
Exchange Offer that are paid by the Company will be amortized by the Company,
as the case may be, over the term of the New Notes in accordance with
generally accepted accounting principles.
 
 
                                      58
<PAGE>
 
CONSEQUENCES OF FAILURES TO PROPERLY TENDER OLD NOTES IN THE EXCHANGE
 
  Issuance of the New Notes in exchange for the Old Notes pursuant to the
Exchange Offer will be made only after timely receipt by the Exchange Agent of
such Old Notes, a properly completed and duly executed Letter of Transmittal
and all other required documents. Therefore, holders of the Old Notes desiring
to tender such Old Notes in exchange for New Notes should allow sufficient
time to ensure timely delivery. The Company is under no duty to give
notification of defects or irregularities with respect to tenders of Old Notes
for exchange. Old Notes that are not tendered or that are tendered but not
accepted by the Company, will, following consummation of the Exchange Offer,
continue to be subject to the existing restrictions upon transfer thereof
under the Securities Act and, upon consummation of the Exchange Offer, certain
registration rights under the Registration Rights Agreement will terminate.
 
  In the event the Exchange Offer is consummated, the Company will not be
required to register the remaining Old Notes. Remaining Old Notes will
continue to be subject to the following restrictions on transfer: (i) the
Remaining Old Notes may be resold only if registered pursuant to the
Securities Act, if any exemption from registration is available thereunder, or
if neither such registration nor such exemption is required by law, and (ii)
the Remaining Old Notes will bear a legend restricting transfer in the absence
of registration or an exemption therefrom. The Company does not currently
anticipate that it will register the Remaining Old Notes under the Securities
Act. To the extent that Old Notes are tendered and accepted in connection with
the Exchange Offer, any trading market for Remaining Old Notes could be
adversely affected.
 
                                      59
<PAGE>
 
                              INDUSTRY BACKGROUND
 
GENERAL
   
  The Company is a leading provider of communication sites and wireless
network services. The Company owns, operates and manages wireless transmission
towers and other communications sites, and also provides an array of related
infrastructure and network support services to the wireless communications and
radio and television broadcasting industries. Each of these industries is
currently experiencing a period of significant change. The wireless
communications industry is growing rapidly as consumers become more aware of
the benefits of wireless services, current wireless technologies are used in
more applications, the cost of wireless services to consumers declines and new
wireless technologies are developed. Changes in U.S. federal regulatory
policy, including the implementation of the 1996 Telecom Act, have led to a
significant number of new competitors in the wireless communications industry
through the auction of frequency spectrum for a wide range of uses, most
notably Personal Communications Services ("PCS"). This competition, combined
with an increasing reliance on wireless communications by consumers and
businesses, has led to an increased demand for higher quality, uninterrupted
service and improved coverage, which, in turn, has led to increased demand for
communication sites as new carriers build out their networks and existing
carriers upgrade and expand their networks to maintain their competitiveness.
The Company believes that, as the wireless communications industry has become
more competitive, wireless communication carriers have sought operating and
capital efficiencies by outsourcing certain network services and build-out
activities and by co-locating transmission equipment with other carriers on
multiple tenant towers. The need for co-location has also been driven by the
growing trend by municipalities to slow the proliferation of towers by
requiring that towers accommodate multiple tenants. While the wireless
communications industry is experiencing rapid growth, the broadcasting
industry has been characterized by rapid consolidation and rationalization.
This industry is currently assessing the benefits of, and planning its
strategy for, the transition from analog to digital transmission systems,
which will require enhanced broadcast infrastructure.     
 
  All of these factors have provided an opportunity for the Company to
specialize in the provision, ownership and management of communication sites,
the leasing of antennae space on such sites and the provision of related
network infrastructure and support services.
 
TRANSMISSION NETWORKS AND TOWERS
 
  Wireless communications and broadcasting companies each require wireless
transmission "networks" in order to provide service to their customers. Each
of these networks is configured specifically to meet the coverage requirements
of the particular carrier and includes transmission equipment such as antennae
placed at various locations throughout the service area. These locations, or
"communication sites," are critical to the operation of a wireless network and
consist of towers, rooftops and other structures upon which antennae are
placed. A network's design and the selection of available communication sites
endeavor to make optimal use of the frequency spectrum available to the
wireless communications carrier based upon projected usage patterns,
topography and design criteria.
 
                                      60
<PAGE>
 
 
              [DIAGRAM DIPICTING WIRELESS COMMUNICATION NETWORK]



- --------
(a) The two towers in the diagram above represent only a small part of the
    interconnecting communication sites that may form a wireless
    communications network. Each tower typically supports both transmitting
    and receiving antennae, as well as microwave equipment to backhaul traffic
    between towers and a carrier switching office.
 
  The value of a tower depends on its location and the number of antennae that
it can support. While most towers have not been built with the capacity to
support multiple tenants, in many instances they can be upgraded to support
additional antennae. Several users may share one tower through "vertical
separation" or "sectorization," with each type of user on a different level.
AM broadcast towers are, however, an exception to this rule because the entire
tower is designed (electrified) to act as an antenna, and the resulting radio
interference problems make such towers undesirable for other wireless
applications.
 
  A typical tower consists of a compound enclosing the tower and an equipment
shelter (which houses a variety of transmitting, receiving and switching
equipment). The tower can be either a self-supported or guyed model. There are
two types of self-supported models: the lattice and the monopole. A lattice
model is usually tapered from the bottom up and can have three or four legs. A
monopole is a tubular structure that is typically used as a single purpose
tower or in places where there are space constraints or a need to address
aesthetic concerns. Guyed towers gain their support capacity from a series of
guy cables attaching separate levels of the tower to anchor foundations in the
ground. Self-supported towers typically range in height from 50-200 feet for
monopoles and up to 1000 feet for lattices, while guyed towers can reach 2000
feet or more.
 
  Rooftop sites are more common in urban downtowns where tall buildings are
generally available and multiple communication sites are required because of
high wireless traffic density. One advantage of a rooftop site is that zoning
regulations typically permit installation of antennae. In cases of such high
population density, neither height nor extended radius of coverage are as
important; and the installation of a tower structure may prove to be
impossible because of zoning restrictions, land cost and land availability.
 
 
                                      61
<PAGE>
 
                       TYPES OF TOWERS AND ANTENNAE (A)
 
 
 
 
                                     LOGO
- --------
(a) Another type of tower not shown here is a guyed tower.
 
DEVELOPMENT OF THE TOWER INDUSTRY
 
  The wireless communications industry was transformed in the 1970s through
the issuance of licenses by the FCC to provide high quality communications
services to vehicle-mounted and hand-held portable telephones, pagers and
other devices. The licensees built and began operating wireless networks that
were supported by communication sites, transmission equipment and other
infrastructure. In the early 1980s, the number of towers began to expand
significantly with the development of more advanced wireless communications,
particularly cellular and paging. Nevertheless, as additional towers were
built by the wireless communications carriers, they often were built for a
single purpose rather than as multiple tenant towers. Further, these towers
were generally owned and maintained by carriers and were treated as corporate
cost centers operated primarily for the purpose of transmitting or receiving
such carriers' signals.
 
  During the mid-to-late 1980s, a number of independent owners of towers began
to emerge. These independent tower operators focused on owning and managing
towers with multiple tenants by adding lessees to existing and reconstructed
towers. The Company believes the majority of these operators were small
business owners with a small number of local towers and few services other
than site rental. In the last five years, however, several larger independent
tower operators have emerged as demand for wireless services has continued to
grow and as additional high frequency licenses have been awarded for new
wireless services (including PCS, narrowband paging and wireless local loop),
each requiring networks with extensive tower infrastructure. These
 
                                      62
<PAGE>
 
independent tower operators have sought to acquire smaller operators as well
as suitable clusters of towers formerly owned by carriers and broadcasters in
order to establish regional and national "tower footprints." Carriers
expanding or building a network in a geographic area generally seek to lease
antennae sites from a tower company with a strategically located cluster of
towers and other communication sites in that area in order to efficiently and
effectively establish service coverage in a given market.
 
  Today, towers are owned by a variety of companies, including wireless
communications carriers, local and long distance telecommunications companies,
broadcasting companies, independent tower operators, utilities and railroad
companies. Despite the increasing demand for towers, the tower industry in the
United States remains highly fragmented, with only a few independent tower
operators owning a large number of towers. The pace of consolidation has begun
to accelerate, however, as the larger independent operators continue to
acquire small local operators and purchase towers from wireless communications
companies. In addition, wireless communications carriers are building out new,
or filling in existing, tower footprints for new and existing wireless
services. Independent operators have also expanded into a number of associated
network and communication site services, including the design of communication
sites and networks, the selection and acquisition of tower and rooftop sites
(including the resolution of zoning and permitting issues) and the
construction of towers. Previously, carriers typically handled such services
through in-house departments, and local nonintegrated service contractors
focused on specific segments such as radio frequency engineering and site
acquisition.
 
TRENDS IN THE WIRELESS COMMUNICATIONS AND BROADCASTING INDUSTRIES
 
  The Company's existing business and future opportunities are affected by the
ongoing trends within the two major industries it serves, namely the wireless
communications industry and the radio and television broadcasting industry.
Each of these industries is currently experiencing a period of significant
change that the Company believes is creating an increasing demand for
communication sites and related infrastructure and network support services.
 
Wireless Communications
   
  The wireless communications industry now provides a broad range of services,
including cellular, PCS, paging, specialized mobile radio ("SMR") and enhanced
specialized mobile radio ("ESMR"). The industry has benefitted in recent years
from increasing demand for its services, and industry experts expect this
demand to continue to increase. The following table sets forth industry
estimates regarding projected subscriber growth for certain types of wireless
communications services:     
 
<TABLE>
<CAPTION>
                                                         1996-2001   2001-2006
                     ESTIMATED   PROJECTED   PROJECTED  COMPOUNDED  COMPOUNDED
                    SUBSCRIBERS SUBSCRIBERS SUBSCRIBERS   ANNUAL      ANNUAL
                       1996        2001        2006     GROWTH RATE GROWTH RATE
                    ----------- ----------- ----------- ----------- -----------
                                 (IN MILLIONS EXCEPT PERCENTAGES)
<S>                 <C>         <C>         <C>         <C>         <C>
Cellular...........    43.7        79.5        90.7         12.7%       2.7%
PCS................     0.3        19.5        49.3        128.8       20.4
Paging.............    41.1        61.9        66.6          8.5        1.5
ESMR...............     0.3         6.6        12.0         85.1       12.9
Fixed Wireless.....     0.0         0.8        20.5           nm       93.8
</TABLE>
- --------
nm = not meaningful
Source: Paul Kagan Associates, Inc. There can be no assurance that these
projections will prove to be accurate.
 
  The Company believes that more communication sites will be required in the
future to accommodate the expected increase in demand for wireless
communications services. Further, the Company sees additional opportunities
with the development of higher frequency technologies (such as PCS) which have
a reduced cell range as a result of signal propagation characteristics that
require a more dense network of towers. In addition, network services may be
required to service the network build-outs of new carriers and the network
upgrades and expansion of existing carriers.
 
                                      63
<PAGE>
 
  Current emerging wireless communications systems, such as PCS and ESMR,
represent an immediate and sizable market for independent tower operators and
network services providers as carriers build out large nationwide and regional
networks. While several PCS and ESMR carriers have already built limited
networks in certain markets, these carriers still need to fill in "dead zones"
and expand geographic coverage. The CTIA estimates that, as of June 30, 1997,
there were 38,650 antennae sites in the United States. The PCIA estimates that
the wireless communications industry will construct at least 100,000 new
antennae sites over the next 10 years. As a result of advances in digital
technology, ESMR operators, including Nextel, have also begun to design and
deploy digital mobile telecommunications networks in competition with cellular
carriers. In particular response to the increased competition, cellular
operators are re-engineering their networks by increasing the number of sites,
locating sites within a smaller radius, filling in "dead zones" and converting
from analog to digital cellular service in order to manage subscriber growth,
extend geographic coverage and provide competitive services. The demand for
communication sites is also being stimulated by the development of new paging
applications, such as e-mail and voicemail notification and two-way paging, as
well as other wireless data applications. In addition, as wireless
communications networks expand and new networks are deployed, the Company
anticipates that demand for microwave transmission facilities that provide
"backhaul" of traffic between communications sites to or from a central
switching facility will also increase.
 
  Licenses are also being awarded, and technologies are being developed, for
numerous new wireless applications that will require networks of communication
sites. These future potential applications include the auction of licenses
scheduled for December 1997 for local multi-point distribution services,
including wireless local loop, wireless cable television, data and Internet
access. Radio spectrum required for these technologies has, in many cases,
already been awarded and licensees have begun to build out and offer services
through new wireless systems. Examples of these systems include local loop
networks operated by WinStar and Teligent, wireless cable networks operated by
companies such as Cellular Vision and CAI Wireless, and data networks being
constructed and operated by RAM Mobile Data, MTEL and Ardis.
 
  In addition to the increased demand for wireless services and the need to
develop and expand wireless communications networks, the Company believes that
other trends influencing the wireless communication industry have important
implications for independent tower operators. In this increasingly competitive
environment, the Company believes that many carriers are dedicating their
capital and operations primarily to those activities that directly contribute
to subscriber growth, such as marketing and distribution. Management believes
these carriers, therefore, may seek to reduce costs and increase efficiency
through the outsourcing of infrastructure network functions such as
communication site ownership, construction, operation and maintenance.
Further, in order to speed new network deployment or expansion and generate
efficiencies, carriers are increasingly co-locating transmission equipment
with that of other network operators. The trend towards co-location has been
furthered by the "Not-In-My-Backyard" ("NIMBY") arguments generated by local
zoning/planning authorities in opposition to the proliferation of towers.
 
Radio and Television Broadcasting
 
  The U.S. broadcasting industry is generally a mature one in terms of demand
for transmission tower capacity. Opportunities exist, however, for independent
tower operators to purchase transmission networks, manage them on behalf of
broadcasters under long-term contracts and lease space on broadcasting towers
to wireless communications carriers. The conversion of broadcast systems from
analog to digital technology will require a substantial number of new towers
to be constructed to accommodate the new systems. For example, the Company
believes that additional demand for tower capacity will occur when digital
spectrum is used to deliver high definition television ("HDTV") or digital
multi-casting, i.e., multiple "normal" definition television channels.
Television station owners will likely broadcast both the existing National
Television Standards Committee ("NTSC") television broadcasting technology and
HDTV for a number of years.
 
CHARACTERISTICS OF THE TOWER INDUSTRY
 
  Management believes that, in addition to the favorable growth and
outsourcing trends in the wireless communications and broadcasting industries
and high barriers to entry as a result of regulatory and local zoning
 
                                      64
<PAGE>
 
restrictions associated with new tower sites, tower operators benefit from
several favorable characteristics. The ability of tower operators to provide
antennae sites to customers on multiple tenant towers provides them with
diversification against the specific technology, product and market risks
typically faced by any individual carrier. The emergence of new technologies,
carriers, products and markets may allow independent tower operators to
further diversify against such risks. Additionally, tower operators face
increased NIMBY sentiment by municipalities, which is reducing the
opportunities for new towers to be built and driving the trend toward co-
location on multiple tenant towers.
 
  The Company believes that independent tower operators also benefit from the
contract nature of the site rental business and the predictability and
stability of these monthly, recurring revenues. In addition, the site rental
business has low variable costs and significant operating leverage. Towers
generally are fixed cost assets with minimal variable costs associated with
additional tenants. A tower operator can generally expect to experience
increasing operating margins when new tenants are added to existing towers.
 
  The site rental business typically experiences low tenant churn as a result
of the high costs that would be incurred by a wireless communications carrier
were it to relocate an antenna to another site and consequently be forced to
re-engineer its network. Moving a single antenna may alter the pre-engineered
maximum signal coverage, requiring a reconfigured network at significant cost
to maintain the same coverage. In addition, regulatory problems associated
with registering the location of the new antenna with the FCC may arise if the
new location is at the edge of the wireless communication carrier's coverage
area and if there is a possible adverse impact on other carriers. Municipal
approvals are becoming increasingly difficult to obtain and may also affect
the carrier's decision to relocate. The costs associated with network
reconfiguration and FCC municipal approval and the time required to complete
these activities may not be justified by any potential saving in reduced site
rental expense.
 
                                      65
<PAGE>
 
                                   BUSINESS
   
  The Company is a leading provider of communication sites and wireless
network services. The Company owns, operates and manages wireless transmission
towers and rooftop sites, and also provides an array of related infrastructure
and network support services to the wireless communications and radio and
television broadcasting industries. The Company's primary business focus is
the leasing of antennae space on multiple tenant towers and rooftops to a
variety of wireless communications carriers under long-term lease contracts.
Supporting its competitive position in the site rental business, the Company
maintains in-house expertise in, and offers its customers, infrastructure and
network support services that include communication site selection and
acquisition, antennae installation, site development and construction and
network design.     
 
  The Company leases antennae space to its customers on its owned and managed
towers. The Company generally receives fees for installing customers'
equipment and antennae on a tower and also receives monthly rental payments
from customers payable under site rental leases that generally range in length
from three to five years. The Company's U.S. customers include such companies
as Aerial Communications, American Paging, AT&T Wireless, Bell Atlantic
Mobile, BellSouth Mobility, Motorola, Nextel, PageNet and Sprint PCS, as well
as private network operators and various federal and local government
agencies, such as the Federal Bureau of Investigation, the Internal Revenue
Service and the U.S. Postal Service.
 
  At September 30, 1997, the Company owned or managed 349 towers and 82
revenue producing rooftop sites in the United States and Puerto Rico. The
Company's tower footprints consist of 171 owned and managed towers located in
western Pennsylvania (primarily in and around the greater Pittsburgh area),
125 owned and managed towers in the southwestern United States (primarily in
western Texas), 21 owned towers located in Mississippi, 14 owned towers on
mountaintops across Puerto Rico, 14 managed towers in West Virginia and 4
other owned towers located in other states across the United States. The
Company plans to enhance and expand its tower footprints by building and
acquiring multiple tenant towers in locations attractive to site rental
customers. To that end, the Company has developed, maintains and deploys for
its own use extensive network design and radio frequency engineering
expertise, as well as site selection, site acquisition and tower construction
capabilities. The Company plans to leverage such expertise and experience in
building and acquiring new towers by entering into build-out or purchase
contracts with various carriers. For example, pursuant to an agreement with
Nextel, the Company has options to construct up to 250 multiple tenant towers
with Nextel as an anchor tenant along certain interstate corridors. In
addition, pursuant to this agreement, the Company has exercised an option to
purchase 50 of Nextel's existing towers clustered in various markets,
including Philadelphia, Houston, Dallas and San Antonio.
 
  The Company's 34.3%-owned affiliate, CTI, owns or has access to
approximately 1,300 towers in the United Kingdom, primarily serving the U.K.
broadcasting industry. CTI's customers include such companies as the BBC,
Cellnet, NTL, Mercury One2One, Orange Personal Communications and Vodaphone
Limited.
 
BACKGROUND
 
  Founded in 1994, the Company acquired 127 towers located in Texas, Colorado,
New Mexico, Arizona, Oklahoma and Nevada from PCI in 1995. Also in 1995, in
order to expand its geographic coverage, scope of services and client base,
the Company consummated the Spectrum Acquisition for a leading rooftop
management and engineering firm that manages rooftop sites. The Spectrum
Acquisition provided the Company with management revenues for 44 rooftop
sites, as well as important relationships with carriers, and gave the Company
an entry into the market for wireless network services.
   
  In 1996, the Company acquired from Motorola a strategic cluster of 14 towers
located on mountaintops across Puerto Rico, as well as one rooftop site and an
island-wide microwave and specialized mobile radio ("SMR") system. The Puerto
Rico Acquisition gave the Company a strategic tower footprint, and positioned
the Company to be a leading independent tower operator in the Puerto Rican
market. In addition, in July 1996, CCIC purchased an option to acquire 36% of
TEA, which represented a significant step for the Company towards     
 
                                      66
<PAGE>
 
becoming a full service provider of wireless network services. TEA is a
leading site acquisition firm offering carriers specialized expertise in site
selection, site acquisition, zoning, permit procurement and project
management. In May 1997, CCIC acquired all the outstanding shares of TEA. In
June 1997, the Company purchased a minority interest in VISI, which intends to
provide computerized geographic information for a variety of business
applications (including site acquisition and telecommunication network
design).
 
  In February 1997, CCIC, along with Candover Investments plc, TeleDiffusion
de France International S.A. (a subsidiary of France Telecom) and Berkshire,
formed CTI to purchase the analog television and radio transmission operations
of the BBC (the "BBC Transmission Business"). The Company owns 34.3% of CTI.
The BBC Transmission Business included ownership of approximately 780 towers
in the United Kingdom and rights to locate broadcast transmission equipment on
an additional 558 towers in the United Kingdom owned by NTL, CTI's primary
competitor. In addition, CTI entered into a 10-year contract with the BBC to
provide analog television and radio transmission services. With the
acquisition of the BBC Transmission Business, the Company, through its
affiliation with CTI, gained access to an expertise in broadcast transmission
upon which the Company believes it can capitalize in other markets. See
"Prospectus Summary--Summary Financial and Other Data of CTI," "Risk Factors--
Relationship with Minority Owned Affiliate; Potential Conflicts of Interests"
and "Certain Relationships and Related Transactions."
 
  In August 1997, CCIC expanded its tower footprints and enhanced its domestic
network services offerings by consummating the Crown Merger. The assets
acquired through the Crown Merger included 61 owned towers and exclusive
leasing rights on 147 other towers and rooftop sites, most of which are
located in and around the greater Pittsburgh area, giving the Company a
significant presence in that market. The remaining Crown communication sites
are located in Pennsylvania, West Virginia, Kentucky, Ohio and Delaware. The
Crown assets included engineering and operational expertise and management
experience. The Crown Merger also provided the Company with relationships with
major wireless communications carriers such as Aerial Communications, AirTouch
Cellular, Bell Atlantic Mobile, AT&T Wireless, PageNet, Nextel and Sprint PCS.
As a result of the Crown Merger, the Company believes it is one of the largest
domestic independent owners and providers of tower sites and wireless network
services.
 
BUSINESS STRATEGY
 
  The Company's objective is to become the leading global provider of
communication sites and network services to the wireless communications and
broadcasting industries. Management believes that the Company's experience in
establishing and expanding its existing tower footprints, its significant
relationships with wireless communications companies and its ability to offer
customers its in-house technical and operational expertise, uniquely position
it to take advantage of available opportunities, to increase cash flow and to
achieve its strategic goals. Key elements of the Company's strategy are to:
 
  .  INCREASE UTILIZATION OF TOWER CAPACITY. The Company seeks to take
     advantage of the operating leverage of its site rental business by
     increasing the amount of antennae space leased on its owned or managed
     communication sites. The Company believes that many of its towers have
     significant capacity available for antennae space rental and actively
     markets this space to wireless communications carriers and broadcasters.
     The Company further believes that increased utilization of its tower
     capacity can be achieved at low incremental cost, thereby yielding
     significant contribution margin. In addition, the Company both will
     continue to build towers with the capacity to accommodate multiple
     tenants and both existing and emerging technologies.
 
  .  EXPAND TOWER FOOTPRINTS. The Company intends to enhance its existing
     tower footprints and to establish new clusters of towers in targeted
     markets, particularly those that have not yet been significantly built
     out by carriers. As the Company has demonstrated in western
     Pennsylvania, it believes that once a strategic critical mass of towers
     is established in a particular region, the Company can attract wireless
     operators by offering the advantages of well-positioned communication
     sites from
 
                                      67
<PAGE>
 
     a single source. The Company is pursuing this strategy through both the
     construction of new towers and the acquisition of existing towers. The
     Company's tower construction strategy is not based on speculative tower
     development but rather on the construction of multiple tenant towers
     with long-term "anchor" tenants. The Company believes that such a
     strategy significantly reduces the risk of developing new sites for its
     tower footprints. The Company intends to focus on working with anchor
     tenants to build in strategic locations, including those that enhance
     the Company's existing clusters of towers, expand its coverage or extend
     its coverage on highways linking municipal markets. For example,
     pursuant to the Nextel Agreement, the Company has options to construct
     up to 250 multiple tenant towers with Nextel as an anchor tenant along
     certain interstate corridors. The Company may also pursue acquisitions
     involving towers or other tower companies, particularly those with the
     potential to create or augment a critical mass of clustered towers in
     new or existing markets. Pursuant to the Nextel Agreement, the Company
     has exercised an option to purchase 50 of Nextel's existing towers
     clustered in various markets, including Philadelphia, Houston, Dallas
     and San Antonio. See "--Significant Contracts."
 
  .  PROVIDE A FULL RANGE OF SERVICES. The Company maintains in-house
     technical and operational expertise to support the development of its
     tower footprints and to offer wireless communications carriers and
     broadcasters a portfolio of technical and operational network services
     to exploit the trend towards outsourcing and the demand for
     sophisticated radio frequency technical competence and services.
     Management believes that the ability to offer end-to-end services (site
     selection and acquisition, antennae installation, site development and
     construction and network design) is a key competitive advantage as
     wireless communications carriers and broadcasters prefer to work with
     independent tower operators that can credibly offer the convenience,
     consistency and efficiency of complete network design and operational
     solutions. Management also believes that the Company's experience in
     building its own tower footprints, as well as its in-house expertise,
     differentiates it from many of its competitors and strengthens the
     Company's ability to increase utilization of its existing towers and its
     ability to attract anchor tenants to its towers.
 
  .  CAPITALIZE ON RELATIONSHIPS WITH KEY CUSTOMERS. The Company intends to
     leverage its existing strategic relationships, contracts and reputation
     for quality service to secure additional site rental, tower build-out
     and network services contracts. For example, the Company has developed
     contractual relationships with a number of regional and national
     carriers, including Aerial Communications, Bell Atlantic Mobile, Nextel
     and Sprint PCS, that provide the Company with a platform from which to
     expand into multiple markets and increase antennae space rented on its
     existing towers. In addition, the Company's customer-oriented approach,
     technical expertise and focus on quality service has enabled it to
     secure contracts such as the Bell Atlantic Agreement which, as of
     September 30, 1997, provided the Company with exclusive rights to lease
     antennae space on 117 existing Bell Atlantic towers (as well as all
     future towers constructed during the term of the agreement) located
     primarily in western Pennsylvania and West Virginia. See "--Significant
     Contracts."
 
  .  CAPITALIZE ON CTI'S EXPERTISE AND OPPORTUNITIES. CTI, the Company's
     34.3%-owned affiliate, employs a corps of engineers and technical
     personnel who designed and built the broadcast transmission network for
     the BBC. CTI owns and operates one of the world's most established radio
     and television broadcasting networks, including both the infrastructure
     and transmission equipment located on 780 owned and 558 licensed towers.
     CTI provides analog television and radio transmission services to the
     BBC under a 10-year contract and has recently won bids to enter into
     transmission contracts to design, build and operate DTT networks for
     four of the six national licenses recently awarded in the United
     Kingdom. The Company intends to leverage its relationship with CTI to
     capitalize on opportunities to design, build, own and manage towers,
     networks and other infrastructure for the broadcasting industry in the
     United States and international markets. In addition, the Company
     intends to leverage its wireless expertise in the United States by
     providing wireless network services to CTI to capitalize on the growth
     of wireless communications in the United Kingdom.
 
  .  PURSUE GROWTH THROUGH ACQUISITIONS. The Company continually evaluates
     potential acquisitions, investments and strategic alliances. The Company
     views such transactions as a means to expand its
 
                                      68
<PAGE>
 
     operations within its existing markets and to enter new markets,
     including international opportunities. The Company's acquisition and
     investment criteria include the existence of high quality assets,
     capacity to add tenants, attractive location for wireless build-out and
     return on capital.
 
COMMUNICATION SITE FOOTPRINTS
 
  The Company owns 215 towers, manages 134 towers and 82 revenue producing
rooftop sites, and is in the process of building 19 towers. Most of the
Company's existing towers are located in three major regions: western
Pennsylvania, the southwestern United States and Puerto Rico. The following
table indicates, as of September 30, 1997, the type and geographic
concentration of the Company's towers and revenue producing rooftop sites:
 
<TABLE>
<CAPTION>
                                                      NUMBER OF
            TYPE OF SITE                         COMMUNICATION SITES % OF TOTAL
            ------------                         ------------------- ----------
   <S>                                           <C>                 <C>
   Towers:
     Pennsylvania...............................         171            39.7%
     Texas......................................          72            16.7
     New Mexico.................................          34             7.9
     Mississippi................................          21             4.9
     Puerto Rico................................          14             3.2
     West Virginia..............................          14             3.2
     Arizona....................................          13             3.0
     Oklahoma...................................           3             0.7
     Nevada.....................................           2             0.5
     All Others.................................           5             1.2
                                                         ---           -----
                                                         349            81.0
   Rooftops(a)..................................          82            19.0
                                                         ---           -----
       Total....................................         431           100.0%
                                                         ===           =====
</TABLE>
- --------
(a) The Company manages an additional 1,356 rooftop sites throughout the
    United States that are available for leasing to its customers.
 
  The Company expects to significantly broaden its existing tower footprints
and expand into new strategically clustered sites by building additional
towers. To that end, the Company has developed and maintains and deploys for
its own use extensive network design and radio frequency engineering expertise
and tower construction capabilities. The Company plans to leverage its network
design expertise to build towers in areas where carriers' signals fail to
transmit in their coverage area. The areas, commonly known as "dead spots,"
are attractive tower locations for the Company. Building a tower only after
securing an anchor tenant, the Company usually has been able to add additional
carriers that have the same "dead spot." The Company also plans to leverage
such expertise and experience in building new towers by entering into build-
out or purchase contracts with various carriers, such as the Nextel Agreement.
As of September 30, 1997, the Company was building 19 towers in western
Pennsylvania, Ohio and Texas to enhance its regional presence in these areas.
As part of the Nextel Agreement, the Company plans to build up to another 250
towers along interstate highways in the midwestern and eastern United States
over the next two years. See "--Significant Contracts."
 
  In addition, the Company plans to use the towers acquired in the Crown
Merger as a model for the towers it intends to build when population density
and perceived demand are such that the Company believes the economics of such
towers are justified. Management believes the Crown towers are superior to
those of its competitors because of their capacity and quality engineering.
The multiple tenant design of the Crown towers obviates the need for expensive
and time consuming modifications to upgrade undersized towers, saving critical
capital and time for carriers facing time-to-market constraints. Using only
hot dipped galvanized structures exceeding the standards of the American
National Standards Institute, Electronics Industry Association and
Telecommunications Industry Association, the Company builds towers capable of
accommodating a large
 
                                      69
<PAGE>
 
number of wireless antennae. The towers are also designed to easily add
additional customers, and the equipment shelters are built to accommodate
another floor for new equipment and air conditioning units if capacity is
reached. The tower site is zoned for multiple carriers at the time the tower
is constructed to allow new carriers to quickly utilize the Company's site. In
addition, the towers, equipment shelters and site compounds are engineered to
protect and maintain the structural integrity of the site. Tower sites are
designed to withstand severe wind, lightning and icing conditions, have
shelters with exclusive security card access and are surrounded by 10 foot
barbed wire fences.
 
  The Company also plans to acquire towers to develop new tower footprints or
to broaden existing tower footprints. As part of the Nextel Agreement, the
Company has exercised an option to acquire 50 of Nextel's existing towers. The
Company believes that these towers will provide it with a nucleus of strategic
clusters in Philadelphia, Houston, Dallas and San Antonio. The Company plans
to acquire additional towers from carriers, such as Nextel, and other
independent tower operators as opportunities present themselves, although
there are currently no agreements with regard to any such acquisitions.
 
  The Company generally believes it has significant capacity on a number of
its towers. Many of the towers it acquired prior to the Crown Merger, however,
may require significant modifications and improvements to raise them to the
quality specifications of the Crown towers or to add additional customers. The
Company intends to pursue these upgrades where it believes it can achieve
appropriate returns to merit the necessary expenditure.
 
PRODUCTS AND SERVICES
 
  The Company is a leading provider of communication sites and wireless
network services. The Company's products and services can be broadly
categorized as either site rental or network services. Network services
provided by the Company include site selection and acquisition, antennae
installation, site development and construction and network design.
 
Site Rental
 
  The Company rents antennae space on its owned and managed towers and
rooftops to a variety of carriers operating cellular, PCS, SMR, ESMR, paging
and other networks. The Company's site rental business has its headquarters in
Pittsburgh, with sales offices in Houston, Albuquerque, Philadelphia and San
Juan. In the first nine months of 1997, after giving pro forma effect to the
Transactions, the Company's site rental business would have had revenues of
$11.3 million and EBITDA before corporate development of $7.5 million.
 
 Tower Site Rental
 
  The Company leases space to its customers on its owned and managed towers.
The Company generally receives fees for installing customers' equipment and
antennae on a tower (as provided in the Company's network services programs)
and also receives monthly rental payments from customers payable under site
leases. The majority of the Company's outstanding customer leases, and the new
leases typically entered into by the Company, have original terms of five
years (with three or four optional renewal periods of five years each) and
provide for annual price increases based on the Consumer Price Index.
 
  Monthly lease pricing varies with the number of antennae installed on each
tower. A PCS, cellular or other broadband customer that has multiple antennae
and other equipment mounted at 100 to 180 feet on the tower generally pays
approximately three times the amount of aggregate monthly rents paid by a
paging or other narrowband customer that requires a single antenna at heights
greater than 200 feet.
 
  The Company also provides a range of site maintenance services in order to
support and enhance its site rental business. The Company believes that by
offering services such as antennae, bay station and tower
 
                                      70
<PAGE>
 
maintenance and security monitoring, it is able to offer quality services to
its existing customers and attract future customers to its communication
sites. Crown was the first site management company in the United States
selected by a major wireless communications company to exclusively manage its
tower network and market the network to other carriers for co-location.
 
  The following table describes the Company's top 10 revenue producing towers:
 
<TABLE>
<CAPTION>
                                                                  SEPTEMBER 1997
                                                      NUMBER OF      MONTHLY
NAME                         LOCATION   HEIGHT (FT) TENANT LEASES    REVENUE
- ----                         --------   ----------- ------------- --------------
<S>                        <C>          <C>         <C>           <C>
Crane..................... Pennsylvania     450          100         $ 76,015
Bluebell.................. Pennsylvania     300          110           63,223
Lexington................. Kentucky         500           88           44,794
Monroeville............... Pennsylvania     500           64           39,620
Sandia Crest.............. New Mexico       140           16           37,314
El Yunque................. Puerto Rico      200           38           27,337
Cranberry................. Pennsylvania     400           50           27,136
Beaver.................... Pennsylvania     500           43           24,768
Greensburg................ Pennsylvania     375           36           24,420
Cerro de Punta............ Puerto Rico      220           39           24,263
                                                         ---         --------
  Total...................                               584         $388,890
                                                         ===         ========
</TABLE>
 
  The Company has entered into master lease agreements with Aerial
Communications, Bell Atlantic Mobile, Nextel and Sprint PCS, among others,
which provide certain terms (including economic terms) that govern new leases
entered into by such parties during the term of their master lease agreements,
lease space on towers in the Pittsburgh major trading area ("Pittsburgh MTA"),
which includes greater Pittsburgh and parts of Ohio, West Virginia and western
Pennsylvania. Each of the Aerial Communications and Sprint PCS agreements has
a 10-year master lease term through December 2006, with one 10-year and one
five-year renewal period. Rents are adjusted periodically based on the
cumulative Consumer Price Index. Nextel's master lease agreement with the
Company has a 10-year master lease term through October 2006, with two 10-year
renewal options. The Company has also entered into an independent contractor
agreement with Nextel. The Bell Atlantic Mobile agreement has a 25-year master
lease term through December 2020. The Company has also entered into a master
lease agreement with Bell Atlantic whereby the Company has the right to lease
antennae space to customers on towers controlled by Bell Atlantic Mobile. See
"--Significant Contracts."
 
  The Company has significant site rental opportunities arising out of its
agreements with Bell Atlantic Mobile and Nextel. In its lease agreement with
Bell Atlantic Mobile, the Company has exclusive leasing rights for 130
existing towers and currently has sublessees on 44 of these towers in the
greater Pittsburgh area. The lease agreement provides that the Company may
sublet space on any of these towers to another carrier subject to certain
approval rights of Bell Atlantic Mobile. To date Bell Atlantic Mobile has
never failed to approve a sublease proposed by the Company. See "--Significant
Contracts--Bell Atlantic Mobile."
 
 Rooftop Site Rental
 
  The Company is a leading rooftop site management company. Through its
subsidiary, Spectrum, the Company develops new sources of revenue for building
owners by effectively managing all aspects of rooftop telecommunications,
including two-way radio systems, microwave facilities, fiber optics, wireless
cable, paging and rooftop infrastructure services. Spectrum's staff includes
radio frequency engineers, managers, technicians and licensing personnel with
extensive experience.
 
  The Company generally enters into management agreements with building owners
and receives a percentage of the revenues generated from the tenant license
agreements. Specifically, the Company designs and contracts
 
                                      71
<PAGE>
 
these sites, actively seeks multiple wireless communications carriers,
prepares end-user license agreements, and then manages and enforces the
agreements. In addition, the Company handles billing and collections and all
calls and questions regarding the site, totally relieving the building's
management of this responsibility.
 
  Through Spectrum, the Company focuses on providing electronic compatibility
for antennae, and maximization of revenue for building owners. In the United
States, radio frequencies are assigned by the FCC but are not coordinated by
proposed site. For this reason, Spectrum has developed its own computerized
engineering program to determine the electronic compatibility of all users at
each site. This program enables Spectrum to maximize site usage. Spectrum
surveys each site and evaluates its location, height, physical and electronic
characteristics, and its engineers prepare a computer analysis to determine
the optimum location for different types of equipment and frequencies. Based
on this analysis, potential site users are identified.
 
  In addition to the technical aspects of site management, the Company
provides operational support for both wireless communications carriers looking
to build out their wireless networks, and building owners seeking to outsource
their site rental activities. The Company stores and regularly updates
relevant site data, such as the location of communications and broadcast
equipment, into a database, which can be utilized to help wireless
communications carriers plan and build out their networks.
 
Network Services
 
  Through designing, building and operating its own communication sites, the
Company has developed an in-house expertise in certain value-added services
that it offers to the wireless communications and broadcasting industries.
Because the Company views itself as a turnkey provider with "end-to-end"
design, construction and operating expertise, it offers its customers the
flexibility of choosing between the provision of a full ready-to-operate
network infrastructure or any of the component services involved therein. Such
services include site selection and acquisition, antennae installation, site
development and construction and network design.
 
 Site Selection and Acquisition
 
  The Company is engaged in site selection and site acquisition services for
its own purposes and for third parties, primarily through its subsidiary, TEA,
which has 15 years of experience serving clients in the communications, public
utility, energy and transportation industries.
 
  The site selection and acquisition process begins with the network design.
Highway corridors, population centers and topographical features are
identified within a carrier's existing or proposed network, and tests are
performed to monitor PCS, cellular, ESMR and other frequencies in order to
locate the systems then operating in that geographic area and identify any
gaps in coverage. Based on this data, the radio frequency engineering
department issues a "search ring," generally of a one-mile radius, to the site
acquisition department for verification of possible land purchase or lease
deals within the search ring. Within each search ring, Geographic Information
Systems ("GIS") specialists select the most suitable sites, based on
demographics, traffic patterns and signal characteristics. Once a site is
selected and the terms of the purchase or lease are completed, a survey is
prepared and the resulting site plan is created. The plan is then submitted to
the local zoning/planning board for approval. If the site is approved, the
Company's construction department takes over the process of constructing the
site.
 
  To capitalize on the growing concerns over tower proliferation, the Company
has developed a program called "Network Solutions" through which it will
attempt to form strategic alliances with local governments to create a single
communications network in their communities. To date the Company's efforts
have focused on western Pennsylvania, where it has formed alliances with three
municipalities. These alliances are intended to accommodate wireless
communications carriers and local public safety, emergency services and
municipal services groups as part of an effort to minimize tower
proliferation. By promoting towers designed for co-location, these alliances
will reduce the number of towers in communities while serving the needs of
wireless communications carriers and wireless customers.
 
 
                                      72
<PAGE>
 
  TEA, the Company's site acquisition subsidiary, specializes in negotiating
leases with landowners and in securing zoning approvals. In addition to its
successful record in the United States, TEA has extensive experience managing
build-outs in Europe, South America and Australia. TeleStructures, a
subsidiary of the Company, provides solutions to the NIMBY dilemma of wireless
companies by building more environmentally neutral and aesthetically
acceptable towers. TeleStructures' designs include a clock tower, bell tower
and others that will allow communications companies to build in areas that
otherwise would not permit a tower to be built. Upon completion of the
Refinancing, TeleStructures will be merged with and into TEA.
 
  In 1997, the Company provided site acquisition services to eight customers,
including Aerial Communications, Bell Atlantic Mobile, Nextel and Sprint PCS.
TEA also provided site acquisition services to GTE Mobilnet, BellSouth
Mobility, AirTouch Cellular and Nextel, among others. These customers engage
the Company and TEA for such site selection and acquisition services on either
a fixed price contract or a time and materials basis.
 
 Site Development and Construction and Antennae Installation
 
  The Company has provided site development and construction and antennae
installation services to the communications industry for over 14 years. The
Company has extensive experience in the development and construction of tower
sites and the installation of antennae, microwave dishes and electrical and
telecommunications lines. The Company's site development and construction
services include clearing sites, laying foundations and electrical and
telecommunications lines, and constructing equipment shelters and towers. The
Company has designed and built and presently maintains tower sites for a
number of its wireless communications customers and a substantial part of its
own tower network. The Company can provide cost-effective and timely
completion of construction projects in part because its site development
personnel are cross-trained in all areas of site development, construction and
antennae installation. A varied inventory of heavy construction equipment and
materials are maintained by the Company at its 45-acre equipment storage and
handling facility in Pittsburgh, which is used as a staging area for projects
in major cities in the eastern region of the United States. The Company
generally sets prices for each site development or construction service
separately. Customers are billed for these services on a fixed price or time
and materials basis and the Company may negotiate fees on individual sites or
for groups of sites.
 
  The Company installs antennae and microwave dishes for its customers on its
owned and managed towers. With more than 14 years of experience and skilled
personnel, the Company has the capability and expertise to install antennae
systems for its paging, cellular, PCS, SMR, ESMR, microwave and broadcasting
customers. As this service is performed, the Company uses its technical
expertise to ensure that there is no interference with other tenants. The
Company typically bills for its antennae installation services on a fixed
price basis.
 
  The Company's construction management capabilities reflect Crown's extensive
experience in the construction of networks and towers. For example, Crown was
instrumental in launching networks for Sprint PCS, Nextel and Aerial
Communications in the Pittsburgh MTA. In addition, Crown supplied these
carriers with all project management and engineering services which included
antennae design and interference analyses.
 
  In 1997, the Company provided site development and construction and antennae
services to approximately 21 customers, including Nextel, Sprint PCS, AT&T
Wireless, Aerial Communications and Bell Atlantic Mobile.
 
 Network Design
 
  The Company has extensive experience in network design and engineering.
While the Company maintains sophisticated network design services primarily to
support the location and construction of Company-owned multiple tenant towers,
the Company does from time to time provide network design services to carriers
and other customers on a consulting contract basis. The Company's network
design services provide customers with relevant information including
recommendations regarding location and height of towers, appropriate types of
antennae, transmission power and frequency selection and related fixed network
considerations.
 
  In designing networks and identifying optimal tower sites, the Company's
radio frequency system design engineers and GIS specialists endeavor to
optimize the coverage of a proposed tower and also conduct radio frequency
emission level testing and analysis for all types of wireless communications
carriers. These specialists have succeeded in designing for diverse network
requirements, including those servicing the challenging topography of the
greater Pittsburgh market.
 
                                      73
<PAGE>
 
  In 1997, the Company provided network design services primarily for its own
footprints and also for certain customers, including Triton Communications,
Nextel and Aerial Communications. These customers are typically charged on a
time and materials basis.
 
Broadcast-Related Services
 
  The Company also provides site rental and service to customers in the
broadcasting industry. Electronic news gathering ("ENG") systems benefit from
the towers and services offered by the Company. The ENG trucks, often in the
form of local television station news vans with telescoping antennae on their
roofs, send live news transmission back to the studio from the scene of an
important event. Typically, these vans cannot send signals back from beyond
about 25 miles. In addition, if they are shielded from the television
transmitter site, they cannot make the connection even at close range. The
Company has developed an ENG repeater system that can be used on many of its
towers in western Pennsylvania. This system allows the ENG van to send a
signal to one of the Company's local towers where the signal is retransmitted
back to the television transmitter site. The retransmission of the signal from
the Company's tower to the various television transmitter sites is done via a
microwave link. The Company charges the station for the ENG receiver system at
the top of its tower and also charges them for the microwave dish they place
on its tower. The Company's ENG customers are affiliates of the NBC, ABC, CBS
and Fox networks.
 
  The Company also has employees with considerable direct construction
experience and market knowledge in the U.S. broadcasting industry, having
worked with numerous television networks around the United States, and a
number of other local broadcasting companies. Management believes that this
experience may help the Company negotiate favorable antenna site lease rates
and construction contracts for both tower and rooftop sites, and to gain an
expertise in the complex issues surrounding electronic compatibility and RF
engineering.
 
CTI
 
  The Company has a 34.3% equity investment in CTI, which owns and operates
one of the world's most established analog transmission networks. CTI provides
transmission services in the United Kingdom for both of the BBC television
stations, five BBC radio stations (including the first digital audio broadcast
station in the United Kingdom) and two commercial radio stations through its
network of 3,460 transmitters in service, which cover 99.4% of the U.K.
population. These transmitters are located at approximately 1,300 towers, more
than half of which are CTI-owned (or leased or licensed to it by third
parties) and the balance of which are licensed to CTI under a site-sharing
agreement (the "Site-Sharing Agreement") with CTI's principal competitor, NTL.
At September 26, 1997, CTI was constructing 13 new towers on existing sites
and had 22 site acquisition projects in process for its new tower sites. At
September 1, 1997, CTI employed 468 people in the United Kingdom. For the year
ended March 31, 1997 and the six months ended September 30, 1997, CTI produced
revenues of $124.7 million ((Pounds)77.0 million) and $60.5 million
((Pounds)37.4 million), respectively, and EBITDA of $48.7 million
((Pounds)30.1 million) and $27.6 million ((Pounds)17.1 million), respectively.
See "Risk Factors--Relationship with Minority Owned Affiliate; Potential
Conflicts of Interest."
 
  CTI's core revenue generating activity is the domestic analog terrestrial
transmission of radio and television programs broadcast by the BBC. CTI's
business, which was formerly owned by the BBC, was privatized under the
Broadcasting Act 1996 and sold to CTI in February 1997. At the time the BBC's
business was acquired by CTI, CTI entered into a 10-year transmission contract
with the BBC (the "BBC Transmission Agreement") for the provision of domestic
terrestrial analog television and radio transmission services. In the fiscal
year ended March 31, 1997, approximately 70% of the total revenues of the CTI
business arose in connection with services provided to the BBC. The BBC
Transmission Agreement provides for charges of approximately (Pounds)46
million to be payable by the BBC to CTI for the year ended March 31, 1998 and
each year thereafter to the termination date, adjusted to reflect inflation.
 
  Analog terrestrial broadcast is the primary mode of transmission for
television and radio programs in the United Kingdom, and management expects it
to remain so for at least the next 15 years. Although the public
 
                                      74
<PAGE>
 
currently receives broadcast television and radio in the United Kingdom via
analog transmission, the U.K. broadcasting industry is preparing itself for
the conversion from analog to digital transmission technology. CTI is well
positioned to benefit from the conversion to digital terrestrial transmission
and has recently entered into transmission contracts for DTT with the winners
(including the BBC) of four of the six DTT licenses granted by the British
government.
 
  The BBC transmission network also provides a valuable initial footprint for
the creation of wireless communications networks. CTI generates site rental
revenue in the United Kingdom by leasing sites on its broadcast towers to
wireless communications carriers. At the time of its privatization, the BBC
Transmission Business had third party revenue from site rental of
approximately (Pounds)9.8 million per year. Currently, approximately 200
companies rent space on approximately 288 of CTI's 780 towers. These site
rental agreements have normally been for three to 12 years and are generally
subject to rent reviews every three years. CTI's largest (by revenue) site
rental customers consist mainly of wireless communications carriers such as
Telecom Securicor Cellular Radio Limited, Vodafone Limited, Vodapage Limited
and Orange Personal Communications Limited. Revenues from these non-BBC
sources are expected to become an increasing portion of CTI's total U.K.
revenue base, as the acquired BBC Transmission Business is no longer
constrained by restrictions on commercial activities previously imposed under
the BBC's ownership.
 
  In addition to the BBC Transmission Agreement, CTI has separate contracts to
provide maintenance and transmission services for two national radio stations,
Virgin Radio and Talk Radio. These contracts are for periods of eight years
commencing from, respectively, March 31, 1993 and February 4, 1995. CTI also
provides complete site management, preventive maintenance, fault repair and
system management services to the Scottish Ambulance Service. Finally, CTI
maintains a mobile radio system for the Greater Manchester Police and also
provides maintenance and repair services for transmission equipment and site
infrastructure.
 
  CTI provides broadcasting and telecommunications engineering services to
various customers in the United Kingdom and overseas. Within the United
Kingdom, CTI has worked with several telecommunications operations on design
and build projects as they roll-out their networks. CTI has had success in
bidding for broadcast consulting contracts, including, over the last two
years, consulting contracts in Thailand, Uganda, Indonesia, Anguilla, Poland
and Sri Lanka.
 
SIGNIFICANT CONTRACTS
 
  The Company has many agreements with telecommunications providers, including
leases, site management contracts and independent contractor agreements. The
Company's agreement with Nextel and its reciprocal leasing arrangements with
Bell Atlantic Mobile present unique opportunities for the Company to (i)
acquire clusters of towers in new markets, (ii) expand existing tower
footprints by constructing multiple tenant towers with long-term anchor
tenants and (iii) increase utilization of existing towers and rooftop sites.
 
Nextel Agreement
 
  On July 11, 1997, in connection with Nextel's proposed merger with PCI, the
Company and Nextel entered into the Nextel Agreement, which establishes the
framework under which the Company and Nextel will conduct joint operations for
the development of infrastructure within the Nextel markets described below.
Under the first part of this agreement, the Company has exercised an option to
purchase 50 existing towers from Nextel, out of an inventory of approximately
180 towers used in digital or analog transmission in the greater metropolitan
areas of Denver and Philadelphia and in certain areas of the states of Texas
and Florida, for a purchase price of approximately $14.4 million. Pursuant to
the Nextel Agreement, the Company has 30 days to sign a purchase agreement
following such exercise (which occurred on November 8, 1997) and a total of 60
days to close the transaction and transfer funds (which is expected to occur
on January 8, 1998).
 
  In addition to the purchase option, the Nextel Agreement provides that the
Company has the exclusive right and option to (i) develop, construct, own and
operate or (ii) purchase and operate, up to 250 new towers within selected
metropolitan areas, including Dallas and Houston, and parts of the interstate
highway corridors traversing the following states: Texas, Oklahoma, Louisiana,
Arkansas, Mississippi, Alabama, Georgia, South
 
                                      75
<PAGE>
 
Carolina, North Carolina, Tennessee, Kentucky, Virginia, Pennsylvania, New
York, Ohio, Maryland and New Jersey. This option extends from July 1997 until
a minimum of 250 potential sites have been tendered to the Company. At October
31, 1997, Nextel had tendered 97 sites to the Company, 46 of which have been
accepted by the Company. Of these 46 sites, 26 sites are in the permitting
process, 14 sites have been permitted and 6 sites are under construction.
Nextel will perform all site acquisition work, including entering into
agreements with the fee owners of sites. If the Company waives its option to
construct or purchase new towers for an identified site tendered to it by
Nextel, Nextel may construct the tower itself or contract with a third party
for the construction. If the Company exercises its option to construct and own
a tower, it will reimburse Nextel for all costs of such site acquisition work.
If Nextel constructs a tower and the Company elects to purchase the
constructed tower, the Company will reimburse Nextel for all site acquisition
and construction costs associated with such towers. Following the completion
of construction of each tower, Nextel and the Company will, pursuant to
Nextel's master lease agreement, enter into a five-year lease contract with
four five-year renewal periods, at the option of Nextel. Nextel has a one-time
right of first refusal for a five-year period to lease additional space within
one designated 20-foot section of each tower.
 
  If the Company elects to construct a new site, construction is to be
completed within a 60-day construction period that will not begin prior to
receipt of all regulatory permits and approvals (or a shorter period as
mutually agreed). In the event that the Company fails to complete any site
within the construction period, Nextel will be entitled to receive liquidated
damages for each such failure. If the Company fails to commence or complete
construction or to complete the installation of towers and related equipment
within the construction period, Nextel may exercise its option to purchase
such site at cost (after giving the Company an opportunity to cure). Nextel
may terminate the Nextel Agreement if the Company fails to complete
construction within the prescribed construction period or if Nextel exercises
its purchase option following certain construction delays by the Company for
the greater of five towers or 5% of the aggregate number of total sites
committed to within a rolling eight-month period. In addition, the Nextel
Agreement provides that it may be terminated by Nextel upon either the
insolvency or liquidation of the Company or in the event that Nextel's
proposed acquisition of PCI does not occur by December 31, 1997, and it may be
terminated by the Company upon the insolvency or liquidation of Nextel.
According to public filings, Nextel consummated its acquisition of PCI on
November 12, 1997. See "Risk Factors--Reliance on Nextel Agreement."
 
Bell Atlantic Mobile
 
  On December 29, 1995, the Company and Bell Atlantic Mobile entered into two
separate 25-year master lease agreements relating to their towers in the
Pittsburgh MTA, one establishing certain terms and conditions of Bell Atlantic
Mobile's tenancy on the Company's towers and the other establishing certain
terms and conditions of the Company's sale of tenancy to other parties on
towers controlled by Bell Atlantic Mobile. In addition to providing site
rental revenue to the Company, the master leases allow each of the Company and
Bell Atlantic Mobile to sublease space on each other's towers in return for a
percentage of the rental revenue generated thereby.
 
  Bell Atlantic Mobile's master lease of space on the Company's towers
provides that Bell Atlantic Mobile's monthly site rental payments per tower
depend on the size of the equipment installed on the tower, the size of the
equipment building and the number of antennae. Rents are adjusted periodically
based on the Consumer Price Index. The Company performs all work at Bell
Atlantic Mobile's sites for tenants, including antennae installation,
grounding and foundations. Both of these master lease agreements included
rights of first refusal relating to certain spaces on towers leased by one of
the parties for which the other party had received a bona fide offer to buy.
In connection with the Crown Merger, the parties amended these master lease
agreements to eliminate the rights of first refusal, and Bell Atlantic waived
any such rights under these agreements that otherwise would have arisen in
connection with the Crown Merger.
 
  The Company also leases space on all of Bell Atlantic Mobile's towers in the
Pittsburgh MTA (the "Bell Atlantic Agreement"). The terms and conditions of
the Company's master lease of space on towers controlled by Bell Atlantic
Mobile are substantially similar to Bell Atlantic Mobile's master lease with
the Company. In order for the Company to sublease space on a tower controlled
by Bell Atlantic Mobile to another tenant,
 
                                      76
<PAGE>
 
however, the Company must receive the written consent of Bell Atlantic Mobile,
which consent cannot be unreasonably withheld, unless such sublease is to a
cellular or PCS provider, in which case Bell Atlantic Mobile may or may not
consent to the sublease in its absolute discretion. To date, the Company has
120 sublease contracts on Bell Atlantic Mobile-controlled towers, and Bell
Atlantic Mobile has never refused to consent to a sublease proposed by the
Company.
 
CUSTOMERS
 
  In both its site rental and network services businesses, the Company works
with a number of customers in a variety of businesses including PCS, ESMR,
paging and broadcasting. The Company works with both large national carriers
such as Sprint PCS, Nextel, AT&T/Cellular One and Omnipoint, and smaller local
regional or private operators such as Aerial Communications, Crescent
Communications and BellSouth Mobility. For the nine months ended September 30,
1997, the Company's largest customers were Sprint PCS and Nextel (including
PCI), together representing 8.5% and 26.4%, respectively, of site rental and
16.1% and 14.4%, respectively, of network services revenues. For the nine
months ended September 30, 1997, no customer accounted for more than 10.0% of
the Company's revenues, other than Sprint PCS and Nextel (including PCI),
which accounted for approximately 14.1% and 17.5%, respectively, of the
Company's consolidated pro forma revenues. Nextel revenues are expected to
grow as the Company purchases Nextel towers and builds out Nextel interstate
corridor sites. The following is a list of the Company's top ten site rental
and network and other services customers, by percentage of pro forma revenues
for the nine months ended September 30, 1997.
 
               TOP 10 SITE RENTAL AND NETWORK SERVICES CUSTOMERS
 
<TABLE>
<CAPTION>
                             PRO FORMA REVENUES
                               FOR NINE MONTHS
                             ENDED SEPTEMBER 30,
SITE RENTAL                         1997         % OF TOTAL SITE RENTAL REVENUES
- -----------                  ------------------- -------------------------------
<S>                          <C>                 <C>
  PCI(a)....................     $ 2,045,102                  18.1%
  Sprint PCS................         955,025                   8.5
  Nextel(a).................         937,582                   8.3
  PageNet...................         692,499                   6.1
  Aerial Communications.....         347,600                   3.1
  Bell Atlantic Mobile......         272,740                   2.4
  Mobile Communications.....         272,223                   2.4
  AT&T/Cellular One.........         204,606                   1.8
  Crescent Communications...         148,699                   1.3
  CommSite..................         121,402                   1.1
                                 -----------                  ----
    Total...................     $ 5,997,478                  53.1%
                                 ===========                  ====
<CAPTION>
                             PRO FORMA REVENUES
                               FOR NINE MONTHS
                             ENDED SEPTEMBER 30,   % OF TOTAL NETWORK SERVICES
NETWORK SERVICES & OTHER            1997                & OTHER REVENUES
- ------------------------     ------------------- -------------------------------
<S>                          <C>                 <C>
  Sprint PCS................     $ 5,202,003                  16.1%
  Nextel....................       4,656,221                  14.4
  Omnipoint.................       3,777,570                  11.7
  GTE.......................       3,590,983                  11.1
  Aerial Communications.....       3,143,297                   9.7
  AT&T/Cellular One.........       1,716,661                   5.3
  Hawaiian Wireless.........       1,333,340                   4.1
  BellSouth Mobility .......       1,002,137                   3.1
  PageNet...................         783,387                   2.4
  Bell Atlantic Mobile......         499,049                   1.5
                                 -----------                  ----
    Total...................     $25,704,648                  79.4%
                                 ===========                  ====
</TABLE>
- --------
(a) PCI merged into a subsidiary of Nextel on November 12, 1997. See "Risk
    Factors--Reliance on Nextel Agreement."
 
                                      77
<PAGE>
 
  As of September 30, 1997, the Company had approximately 2,443 individual
leases on its 431 tower and rooftop sites. The following is a list of some of
the Company's leading site rental customers by industry segment and the
percentage of the Company's September 1997 monthly site rental revenues (on a
pro forma basis) derived from each industry segment:
 
                             CUSTOMERS BY INDUSTRY
 
<TABLE>
<CAPTION>
                                                                       SEPTEMBER
                                                                        MONTHLY   % OF TOTAL
                                                                        REVENUES   SEPTEMBER
                                                           NUMBER OF       BY     SITE RENTAL
INDUSTRY                       SELECTED CUSTOMERS        TENANT LEASES  INDUSTRY   REVENUES
- --------                       ------------------        ------------- ---------- -----------
<S>                      <C>                             <C>           <C>        <C>
SMR/ESMR................ Nextel, SMR Direct                    390     $  481,946     34.9%
Paging.................. AirTouch Cellular, American
                          Paging, PageNet                      800        343,684     24.9
PCS..................... Aerial Communications, Sprint
                          PCS, Western Wireless                120        158,675     11.5
Cellular................ AT&T Wireless, Bell Atlantic
                          Mobile                               152        122,925      8.9
Private Industrial
 Users.................. IBM, Phillips Petroleum               540         91,021      6.6
Governmental Agencies... FBI, INS, Puerto Rico Police          186         75,538      5.5
Broadcasting............ Hearst Argyle Television,
                          Trinity Broadcasting                  86         43,502      3.2
Data.................... Ardis, RAM Mobile Data                104         32,029      2.3
Other................... WinStar                                45         19,823      1.4
Utilities............... Equitable Resources, Nevada
                          Power                                 20         10,787      0.8
                                                             -----     ----------    -----
  Total.................................................     2,443     $1,379,930    100.0%
                                                             =====     ==========    =====
</TABLE>
 
SALES AND MARKETING
 
  The Company's sales and marketing personnel, located in Pittsburgh, Houston,
Albuquerque, Atlanta, Philadelphia and San Juan, Puerto Rico, target carriers
expanding their networks, entering new markets, bringing new technologies to
market and requiring maintenance or add-on business. The Company's objective
is to pre-sell capacity on the Company's towers by promoting sites prior to
actual construction. The Company utilizes numerous public and proprietary
databases to develop detailed target marketing programs directed at auction
block license awardees, existing tenants and specific market groups. The
marketing department also works to maintain the Company's visibility within
the wireless communications industry through regular public relations efforts.
These efforts include actively participating in trade shows and generating
regular press releases, newsletters and targeted mailings (including
promotional flyers). The Company's promotional activities range from
advertisements and site listings in industry publications to maintaining a
presence at national trade shows. The Company's network services capabilities
are marketed in conjunction with its tower footprints.
 
  In addition to a dedicated, full-time sales and marketing staff, a number of
senior managers spend a significant portion of their efforts on sales and
marketing activities. These managers call on existing and prospective
customers and also seek greater visibility in the industry through speaking
engagements and articles in national publications. Furthermore, many of these
managers have been recognized as industry experts, are regularly quoted in
articles and are called on to testify at local hearings and to draft local
zoning ordinances.
 
COMPETITION
 
  The Company competes with other independent tower owners, some of which also
provide site rental and network services; carriers, which own and operate
their own tower networks; service companies that provide engineering and site
acquisition services; and other potential competitors, such as utilities,
outdoor advertisers and broadcasters, some of which have already entered the
tower industry. Wireless communications carriers that
 
                                      78
<PAGE>
 
own and operate their own tower networks generally are substantially larger
and have greater financial resources than the Company. The Company believes
that tower location, capacity, price, quality of service and density within a
geographic market historically have been and will continue to be the most
significant competitive factors affecting tower rental companies. The Company
also competes for acquisition and new tower construction opportunities with
wireless communications carriers, site developers and other independent tower
operating companies and believes that competition for tower site acquisitions
will increase and that additional competitors will enter the tower market,
some of which may have greater financial resources than the Company.
 
  The following is a list of certain of the tower companies that compete with
the Company: American Tower Corporation (an affiliate of Clear Channel
Communication), American Tower Systems (currently a wholly owned subsidiary of
American Radio Systems), Lodestar Communications, Motorola, Omni America (an
affiliate of Hicks, Muse, Tate and Furst), Pinnacle Tower, SBA Communications,
TeleCom Towers (an affiliate of Cox Communications) and Unisite.
 
  The following companies are primarily competitors for the Company's site
management activities: AAT, APEX, Comsite International, JJS Leasing, Inc.,
Motorola, Signal One, Subcarrier Communications and Tower Resources
Management.
 
  The Company believes that the majority of TEA's competitors in the site
acquisition business operate within local market areas exclusively, while a
small minority of firms appear to offer their services nationally, including
SBA Communications Corporation, Whalen & Company and Gearon & Company. TEA
offers its services nationwide and the Company believes it is currently one of
the largest providers of site development services to the U.S. and
international markets. The market includes participants from a variety of
market segments offering individual, or combinations of, competing services.
The field of competitors includes site acquisition consultants, zoning
consultants, real estate firms, right-of-way consulting firms, construction
companies, tower owners/managers, radio frequency engineering consultants,
telecommunications equipment vendors (which provide turnkey site development
services through multiple subcontractors) and carriers' internal staff. The
Company believes that carriers base their decisions on site development
services on certain criteria, including a company's experience, track record,
local reputation, price and time for completion of a project. The Company
believes that TEA competes favorably in these areas.
 
PROPERTIES
 
  The Company's interests in its tower sites are comprised of a variety of fee
interests, leasehold interests created by long-term lease agreements, private
easements, and easements, licenses or rights-of-way granted by government
entities. In rural areas, a tower site typically consists of a three- to five-
acre tract which supports towers, equipment shelters and guy wires to
stabilize the structure. Less then 3,000 square feet are required for a self-
supporting tower structure of the kind typically used in metropolitan areas.
The Company's land leases generally have five- or ten-year terms and
frequently contain one or more renewal options. Some land leases provide
"trade-out" arrangements whereby the Company allows the landlord to use tower
space in lieu of paying all or part of the land rent. As of December 31, 1996,
the Company had approximately 128 land leases. Pursuant to the Senior Credit
Facility, the Company's senior lenders have liens on a substantial number of
the Company's land leases and other property interests in the United States.
 
LEGAL PROCEEDINGS
 
  The Company is occasionally involved in legal proceedings that arise in the
ordinary course of business. Most of these proceedings are appeals by
landowners of zoning and variance approvals of local zoning boards. While the
outcome of these proceedings cannot be predicted with certainty, management
does not expect any pending matters to have a material adverse effect on the
Company's financial condition or results of operations.
 
EMPLOYEES
 
  At September 1, 1997, the Company employed 370 people. The Company's future
success will depend, in part, on its ability to continue to attract, retain
and motivate highly qualified technical, marketing, engineering and management
personnel.
 
                                      79
<PAGE>
 
  The Company is not a party to any collective bargaining agreements and has
not experienced any strikes or work stoppages, and management believes that
the Company's employee relations are good.
 
REGULATORY AND ENVIRONMENTAL MATTERS
 
United States
 
  Federal Regulations. Both the FCC and FAA regulate towers used for wireless
communications transmitters and receivers. Such regulations control the siting
and marking of towers and may, depending on the characteristics of particular
towers, require registration of tower facilities. Wireless communications
devices operating on towers are separately regulated and independently
licensed based upon the particular frequency used.
 
  Pursuant to the requirements of the Communications Act of 1934, as amended,
the FCC, in conjunction with the FAA, has developed standards to consider
proposals for new or modified antennae structures. These standards mandate
that the FCC and the FAA consider the height of proposed antennae structures,
the relationship of the structure to existing natural or man-made obstructions
and the proximity of the antennae structures to runways and airports.
Proposals to construct or to modify existing antennae structures above certain
heights are reviewed by the FAA to ensure the structure will not present a
hazard to aviation. The FAA may condition its issuance of a no-hazard
determination upon compliance with specified lighting and/or marking
requirements. The FCC will not license the operation of wireless
telecommunications devices on towers unless the tower has been registered with
the FCC or a determination has been made that such registration is not
necessary. The FCC will not register a tower unless it has been cleared by the
FAA. The FCC may also enforce special lighting and painting requirements.
Owners of wireless transmissions towers may have an obligation to maintain
painting and lighting to conform to FCC standards. Tower owners may also bear
the responsibility of notifying the FAA of any tower lighting outage. The
Company generally indemnifies its customers against any failure to comply with
applicable regulatory standards. Failure to comply with the applicable
requirements may lead to civil penalties.
 
  The 1996 Telecom Act preempted certain state and local zoning authorities'
jurisdiction over the construction, modification and placement of towers. The
new law prohibits any action that would (i) discriminate between different
providers of personal wireless services or (ii) ban altogether the
construction, modification or placement of radio communications towers.
Finally, the 1996 Telecom Act requires the federal government to help
licensees for wireless communications services gain access to preferred sites
for their facilities. This may require that federal agencies and departments
work directly with licensees to make federal property available for tower
facilities.
 
  Owners and operators of antennae may be subject to, and therefore must
comply with, Environmental Laws. The FCC's decision to license a proposed
tower may be subject to environmental review pursuant to the National
Environmental Policy Act of 1969 ("NEPA"), which requires federal agencies to
evaluate the environmental impacts of their decisions under certain
circumstances. The FCC has issued regulations implementing NEPA. Such
regulations place responsibility on each applicant to investigate any
potential environmental effects of operations and to disclose any significant
effects on the environment in an environmental assessment prior to
constructing a tower. In the event the FCC determines the proposed tower would
have a significant environmental impact based on the standards the FCC has
developed, the FCC would be required to prepare an environmental impact
statement. This process could significantly delay the registration of a
particular tower.
 
  As an owner and operator of real property, the Company is subject to certain
Environmental Laws which may impose strict, joint and several liability for
the cleanup of on-site or off-site contamination and related personal or
property damages. The Company is also subject to certain Environmental Laws
that govern tower placement, including pre-construction environmental studies.
Operators of towers must also take into consideration certain RF emissions
regulations that impose a variety of procedural and operating requirements.
The potential connection between RF emissions and certain negative health
effects, including some forms of cancer, has been the subject of substantial
study by the scientific community in recent years. To date, the results
 
                                      80
<PAGE>
 
of these studies have been inconclusive. Although the Company has not been
subject to any claims relating to RF emissions, it is presently evaluating
certain of its towers in the United Kingdom to determine whether RF emission
reductions are possible. The Company believes that it is in substantial
compliance with all applicable Environmental Laws. Nevertheless, there can be
no assurance that the costs of compliance with existing or future
Environmental Laws will not have a material adverse effect on the Company's
business, results of operations, or financial condition.
 
  Local Regulations. Local regulations include city and other local
ordinances, zoning restrictions and restrictive covenants imposed by community
developers. These regulations vary greatly, but typically require tower owners
to obtain approval from local officials or community standards organizations
prior to tower construction. Local zoning authorities generally have been
hostile to construction of new transmission towers in their communities
because of the height and visibility of the towers.
 
United Kingdom
 
  Telecommunications systems and equipment used for the transmission of
signals over radio frequencies have to be licensed in the United Kingdom.
These licenses are issued on behalf of the British Government by the Secretary
of State under the Telecommunications Act 1984 and the Wireless Telegraphy Act
1949. CTI has a number of such licenses under which it runs the
telecommunications distribution and transmission systems which are necessary
for the provision of its transmission services. CTI's operations are subject
to comprehensive regulation under the laws of the United Kingdom.
 
                                      81
<PAGE>
 
                                  MANAGEMENT
 
DIRECTORS AND EXECUTIVE OFFICERS
 
  The following table sets forth information concerning the directors and
executive officers of the Company (ages as of October 1, 1997):
 
<TABLE>
<CAPTION>
              NAME                AGE         POSITIONS WITH THE COMPANY
              ----                ---         --------------------------
<S>                               <C> <C>
Ted B. Miller, Jr. ..............  46 Chief Executive Officer and Vice Chairman
                                      of the Board of Directors
David L. Ivy.....................  50 President and Director
Charles C. Green, III............  51 Executive Vice President and Chief
                                      Financial Officer
John L. Gwyn.....................  50 Executive Vice President
Robert A. Crown..................  43 Director
Carl Ferenbach...................  55 Chairman of the Board of Directors
Garth H. Greimann................  42 Director
Randall A. Hack..................  50 Director
David C. Hull, Jr. ..............  53 Director
Edward C. Hutcheson, Jr. ........  52 Director
J. Landis Martin.................  51 Director
Robert F. McKenzie...............  53 Director
Jeffrey H. Schutz................  45 Director
</TABLE>
 
  TED B. MILLER, JR. has been the Chief Executive Officer since November 1996,
Vice Chairman of the Board of Directors since August 1997 and a director of
the Company since 1995. Mr. Miller co-founded CTC in 1994. He was the
President of the Company and CTC from November 1996 to August 1997. Since
February 1997, Mr. Miller has been the Managing Director, Chief Executive
Officer and a director of CTI. Mr. Miller is a founding member of InterComp
Technologies, L.C., a company providing payroll tax services in the former
Soviet Union, and has served on its Board of Managers since 1994. In 1986, Mr.
Miller founded Interstate Realty Corporation ("Interstate"), a real estate
brokerage and consulting company, and has been its President and Chief
Executive Officer since inception. Mr. Miller is a director of VISI and a
director and/or an officer of each wholly owned subsidiary of the Company.
 
  DAVID L. IVY has been the President of the Company since August 1997, and
was elected as a director of the Company in June 1997. From October 1996 to
August 1997, he served as Executive Vice President and Chief Financial Officer
of the Company. Since 1995, he has been the President of DLI, Inc., a real
estate consulting company. From 1993 to 1995, Mr. Ivy was a senior executive
with, and later the President and Chief Operating Officer of, J.E. Robert
Companies, where he managed a joint venture with Goldman, Sachs & Co. that was
established to acquire distressed assets from financial institutions. From
1987 to 1993, Mr. Ivy served as Chairman of the Board of Directors of
Interstate. Mr. Ivy is a director of VISI and a director and/or officer of
each wholly owned subsidiary of the Company.
 
  CHARLES C. GREEN, III has been an Executive Vice President and Chief
Financial Officer of the Company since September 1997. Mr. Green was the
President and Chief Operating Officer of Torch Energy Advisors Incorporated
("Torch"), a major energy asset management and outsourcing company, from 1993
to 1995, and Vice Chairman of the Board of Directors and Chief Investment
Officer from 1995 to 1996. From 1992 to September 1997, he was an officer, and
later the Executive Vice President and Chief Financial Officer, of Bellwether
Exploration Company, an oil and gas exploration and production company and an
affiliate of Torch. From 1982 to 1992, Mr. Green was President, Chief
Operating Officer and Chief Financial Officer of Treptow Development Company,
a real estate development company. Mr. Green currently serves on the Board of
Directors of Teletouch Communications, Inc. and Bellwether Exploration
Company. He has been a Chartered Financial Analyst since 1974.
 
                                      82
<PAGE>
 
  JOHN L. GWYN has been an Executive Vice President of the Company since
August 1997. From February to August 1997, Mr. Gwyn served as Senior Vice
President of the Company and CTC. From 1994 to February 1997, Mr. Gwyn was a
Vice President and Director of Commercial Real Estate Asset Management of
Archon Group, L.P., a real estate asset management company and a wholly owned
subsidiary of Goldman, Sachs & Co. From 1989 to 1993, he was a Senior Vice
President of The Robert C. Wilson Company, a mortgage banking company. Mr.
Gwyn is a director and/or an officer of each wholly owned subsidiary of the
Company with the exception of Crown Communication.
 
  ROBERT A. CROWN founded the Crown Business in 1980 and has been the
President and Chief Operating Officer since its inception. Mr. Crown is the
Chief Executive Officer of Crown Communication and was elected as a director
of the Company in August 1997. Mr. Crown has been responsible for the initial
construction in Pittsburgh of the Cellular One system, as well as a
substantial portion of the Bell Atlantic Mobile system in Pittsburgh. He also
negotiated one of the first complete end-to-end build-outs for Nextel for the
Pittsburgh MTA. Pursuant to the Stockholders Agreement, Mr. Crown was the
nominee of the Crowns for election as a director of the Company.
 
  CARL FERENBACH was elected as the Chairman of the Board of Directors of the
Company in April 1997. Since its founding in 1986, Mr. Ferenbach has been a
Managing Director of Berkshire, a private equity investment firm that manages
four investment funds with approximately $750 million of capital. Mr.
Ferenbach is also the Chairman of the Board of Directors of CTI, and currently
serves on the Board of Directors of Wisconsin Central Transportation
Corporation, Tranz Rail Limited and U.S. Can Corporation. Pursuant to the
Stockholders Agreement, Mr. Ferenbach was the nominee of Berkshire Partners
Group (as defined) for election as a director of the Company.
 
  GARTH H. GREIMANN was elected as a director of the Company in April 1997.
Mr. Greimann has been a Managing Director of Berkshire, Third Berkshire
Associates LLC and Fourth Berkshire Associates LLC, since 1993. He was a Vice
President of Berkshire from 1989 to 1993. Mr. Greimann also serves on the
Board of Directors of Profit Recovery Group International, Inc., and Trico
Marine Services, Inc. ("Trico"). Pursuant to an oral agreement among the
Investors (as defined), Mr. Greimann was the nominee of Berkshire Partners
Group for election as a director of the Company.
 
  RANDALL A. HACK was elected as a director of the Company in February 1997.
Since January 1995, Mr. Hack has been a member of Nassau Capital L.L.C., an
investment management firm. From 1990 to 1994, he was the President and Chief
Executive Officer of Princeton University Investment Company, which manages
the endowment for Princeton University. Mr. Hack also serves on the Board of
Directors of several private companies. Pursuant to the Stockholders
Agreement, Mr. Hack was the nominee of Nassau Group for election as a director
of the Company.
 
  DAVID C. HULL, JR. was elected as a director of the Company in January 1997.
Mr. Hull has been a General Partner of Centennial Fund IV, L.P. ("Centennial
Fund IV") and Centennial Fund V, L.P. ("Centennial Fund V"), each a venture
capital fund, since 1994 and 1996, respectively. Since 1990, he has held
various positions at Centennial Holdings, Inc. ("CHI"), a venture capital
management company, and is currently an Executive Vice President. Since 1986,
he has held various positions at Criterion Investments, Inc., a venture
capital management company, and is currently an Executive Vice President. Mr.
Hull also serves on the Board of Directors of CardioGenesis Corporation and
several private companies. Pursuant to an oral agreement among the Investors,
Mr. Hull was the nominee of Centennial Group for election as a director of the
Company.
 
  EDWARD C. HUTCHESON, JR. has been a director of the Company since 1995, was
the Chief Executive Officer of the Company from its inception to October 1996
and was the Chairman of the Board of Directors of the Company from its
inception to October 1997. Mr. Hutcheson co-founded CTC in 1994. Since January
1997, Mr. Hutcheson has been associated with the corporate finance group of
Harris, Webb & Garrison, an investment banking firm based in Houston. During
1994, he was involved in private investment activities leading to the creation
of the Company. From 1990 to 1993, he was the President, Chief Operating
Officer and a director of Baroid Corporation ("Baroid"), a company engaged the
petroleum services business. Mr. Hutcheson also serves on the Board of
Directors of Trico and Titanium Metals Corporation ("Timet").
 
                                      83
<PAGE>
 
  J. LANDIS MARTIN was elected as a director of the Company in 1995. Mr.
Martin has been Chairman of Timet since 1987 and Chief Executive Officer of
Timet since January 1995. He also served as President of Timet from January
1995 to February 1996. Mr. Martin has served as Chairman of Tremont
Corporation ("Tremont") since 1990 and as Chief Executive Officer and a
director of Tremont since 1988. Mr. Martin has served as President and Chief
Executive Officer of NL Industries, Inc. ("NL"), a manufacturer of specialty
chemicals, since 1987 and as a director of NL since 1986. From 1990 until its
acquisition by Dresser Industries, Inc. ("Dresser") in 1994, Mr. Martin served
as Chairman of the Board and Chief Executive Officer of Baroid. In addition to
Tremont and NL, Mr. Martin is a director of Dresser, which is engaged in the
petroleum services, hydrocarbon processing and engineering industries, and
Apartment Investment Management Corporation, a real estate investment trust.
 
  ROBERT F. MCKENZIE was elected as a director of the Company in 1996. From
1990 to 1994, Mr. McKenzie was the Chief Operating Officer and a director of
OneComm, Inc., a mobile communications provider that he helped found in 1990.
From 1980 to 1990, he held general management positions with Northern Telecom,
Inc. and was responsible for the marketing and support of its Meridian
Telephone Systems and Distributed Communications networks to businesses
throughout the western United States. Mr. McKenzie also serves on the Board of
Directors of Centennial Communications Corporation.
 
  JEFFREY H. SCHUTZ was elected as a director of the Company in 1995. Mr.
Schutz has been a General Partner of Centennial Fund IV and Centennial Fund V,
each a venture capital investing fund, since 1994 and 1996, respectively. Mr.
Schutz also serves on the Board of Directors of Preferred Networks, Inc. and
several other private companies. Pursuant to the Stockholders Agreement, Mr.
Schutz was the nominee of Centennial Group for election as a director of the
Company.
 
  Directors are elected annually to serve until the next annual meeting of
stockholders and until their successors are elected and qualified. Officers
are elected by and serve at the discretion of the Board of Directors.
 
BOARD COMMITTEES
 
  The Company's Board of Directors has an Executive Committee, a Compensation
Committee, a Finance and Audit Committee and a Nominating and Corporate
Governance Committee. The Executive Committee, composed of Messrs. Ferenbach,
Crown, Miller, Schutz and Hack, acts in lieu of the full Board in emergencies
or in cases where immediate and necessary action is required and the full
Board cannot be assembled. The Compensation Committee, composed of Messrs.
Ferenbach, Martin, Schutz and McKenzie, establishes salaries, incentives and
other forms of compensation for executive officers and administers incentive
compensation and benefit plans provided for employees. The Finance and Audit
Committee, composed of Messrs. Greimann, Hack, Hull and Hutcheson, reviews the
Company's audit policies and oversees the engagement of the Company's
independent auditors, as well as developing financing strategies for the
Company and approving outside suppliers to implement these strategies. The
Nominating and Corporate Governance Committee, composed of Messrs. Greimann,
Hull, Hutcheson, McKenzie and Martin, is responsible for nominating new Board
members and for an annual review of Board performance.
 
DIRECTORS' COMPENSATION AND ARRANGEMENTS
 
  The three outside directors of the Company receive compensation for their
service as directors ($1,000 per meeting for attendance at meetings of the
Board of Directors and each committee thereof), and all directors are
reimbursed for expenses incidental to attendance at such meetings. In
September 1997, CCIC's Board of Directors approved a fee of $150,000 per annum
to Berkshire (half of which is to be paid by CTI) for general consulting
services and for the services of Mr. Ferenbach as Chairman of the Board. In
addition, Mr. McKenzie received approximately $10,000 in 1996 for specific
consulting assignments requested by the Chief Executive Officer. Messrs.
Ferenbach, Greimann, Hull and Schutz are indemnified by the respective
entities which they represent on CCIC's Board of Directors.
 
                                      84
<PAGE>
 
  The Company's By-laws provides for the annual election of directors at
stockholders' meetings. The Company's Amended Certificate provides that the
holders of the Preferred Stock (as defined), voting together and separately
from other classes, are entitled to elect five directors, the holders of
Series A Convertible Preferred Stock are entitled to elect two directors, and
the holders of Preferred Stock and Common Stock (as defined), voting together
as a single class, are entitled to elect two directors (with the Preferred
Stock being considered on an "as converted" basis). Pursuant to the
Stockholders Agreement, Robert A. Crown, Barbara Crown or their permitted
transferees have the right to designate one nominee for election as a
director, and the other investors and stockholders party thereto have agreed
to vote in favor of this nominee. See "Description of Capital Stock--
Stockholders Agreement."
 
EXECUTIVE COMPENSATION
 
  The following table sets forth the cash and non-cash compensation paid by or
incurred on behalf of the Company to its Chief Executive Officer and the one
other executive officer (collectively, the "named executive officers") for
each of the two years ended December 31, 1996.
 
                          SUMMARY COMPENSATION TABLE
<TABLE>
<CAPTION>
                                                          LONG TERM
                                                         COMPENSATION
                                  ANNUAL COMPENSATION       AWARDS
                                  ---------------------- ------------
                                                          NUMBER OF
                                                          SECURITIES
                                                          UNDERLYING
                                                           OPTIONS/      ALL OTHER
NAME AND PRINCIPAL POSITION  YEAR SALARY ($)   BONUS ($) SARS (#)(A)  COMPENSATION ($)
- ---------------------------  ---- ----------   --------- ------------ ----------------
<S>                          <C>  <C>          <C>       <C>          <C>
Ted B. Miller, Jr.......     1996  $152,600     $75,000        --             --
 Chief Executive Officer     1995   146,154         --      69,000            --
 and
 Vice Chairman of the
 Board of Directors
David L. Ivy............     1996    37,500(b)      --      35,000        $35,000(c)
 President and Director      1995       --          --         --             --
 
</TABLE>
- --------
(a) All awards are for options to purchase the number of shares of Class B
    Common Stock indicated.
(b) Mr. Ivy began working for CCIC on October 1, 1996, at an annual salary of
    $150,000.
(c) Mr. Ivy worked as a consultant to CCIC from May 1996 to September 1996
    before joining the Company as an employee in October 1996.
 
                    OPTIONS/SAR GRANTS IN LAST FISCAL YEAR
<TABLE>
<CAPTION>
                                                                                      POTENTIAL REALIZABLE
                                                                                            VALUE AT
                                                                                         ASSUMED ANNUAL
                                                                                      RATES OF STOCK PRICE
                                                                                        APPRECIATION FOR
                                              INDIVIDUAL GRANTS                          OPTION TERM (A)
                         ------------------------------------------------------------ ---------------------
                          NUMBER OF    % OF TOTAL
                          SECURITIES  OPTIONS/SAR S
                          UNDERLYING   GRANTED TO
                         OPTIONS/SARS EMPLOYEES IN     EXERCISE OR
NAME                     GRANTED (#)   FISCAL YEAR  BASE PRICE ($/SH) EXPIRATION DATE   5% ($)    10% ($)
- ----                     ------------ ------------- ----------------- --------------- ---------- ----------
<S>                      <C>          <C>           <C>               <C>             <C>        <C>
Ted B. Miller, Jr.......       --          --               --                --             --         --
David L. Ivy............    35,000        77.8%          $12.00          12/20/06     $  264,136 $  669,372
</TABLE>
- --------
(a) The potential realizable value assumes a per-share market price at the
    time of the grant to be approximately $12.00 with an assumed rate of
    appreciation of 5% and 10%, respectively, compounded annually for 10
    years.
 
                                      85
<PAGE>
 
  The following table details the December 31, 1996 year end estimated value
of each named executive officer's unexercised stock options. All unexercised
options are to purchase the number of shares of Class B Common Stock
indicated.
 
             AGGREGATED OPTIONS/SAR EXERCISES IN LAST FISCAL YEAR
                        AND YEAR-END OPTION/SAR VALUES
 
<TABLE>
<CAPTION>
                                                       NUMBER OF SECURITIES
                                                      UNDERLYING UNEXERCISED VALUE OF UNEXERCISED
                                                             OPTIONS/        IN-THE-MONEY OPTIONS/
                                                       SARS AT YEAR-END(#)   SARS AT YEAR-END ($)
                         SHARES ACQUIRED    VALUE        EXERCISABLE (E)/      EXERCISABLE (E)/
NAME                     ON EXERCISE (#) REALIZED ($)  UNEXERCISABLE (U)(A)  UNEXERCISABLE (U)(B)
- ----                     --------------- ------------ ---------------------- ---------------------
<S>                      <C>             <C>          <C>                    <C>
Ted B. Miller, Jr.......       --            --               69,000(E)           $2,452,260(E)
                                                                 -- (U)                  -- (U)
David L. Ivy............       --            --                8,750(E)              223,475(E)
                                                              26,250(U)              670,425(U)
</TABLE>
- --------
(a) Fifty percent of the options to purchase Class B Common Stock granted in
    1994, 1995 and 1996 become exercisable at 10% per year from the date of
    grant. The other fifty percent of the options vest upon achievement of a
    stated internal rate of return.
(b) The estimated value of exercised in-the-money stock options held at the
    end of 1996 assumes a per-share fair market value of $37.54 and per-share
    exercise prices of $2.00 and $12.00, as applicable.
 
Stock Option Plan
 
  The Company has adopted the 1995 Stock Option Plan (the "Stock Option
Plan"). The purpose of the Stock Option Plan is to advance the interests of
the Company by providing additional incentives and motivations which help the
Company to attract, retain and motivate key employees, directors and
consultants. The description set forth below summarizes the general terms of
the Stock Option Plan and the options granted pursuant to the Stock Option
Plan.
 
  Pursuant to the Stock Option Plan, the Company can grant options to purchase
up to 1,153,000 shares of Class B Common Stock. Options granted under the
Stock Option Plan are nonqualified stock options which will not qualify as
incentive stock options pursuant to Section 422 of the Code. The price at
which a share of Class B Common Stock may be purchased upon exercise of an
option granted under the Stock Option Plan will be determined by the Board of
Directors and may be less than the fair market value of the Class B Common
Stock on the date that the option is granted. The exercise price may be paid
in cash, in shares of Class B Common Stock (valued at fair market value at the
date of exercise) or by a combination of such means of payment, as may be
determined by the Board.
 
  Key employees, directors or consultants of the Company (including its
subsidiaries and affiliates) are eligible to receive options under the Stock
Option Plan. The Stock Option Plan is administered by the Board and the Board
is authorized to interpret and construe the Stock Option Plan. Subject to the
terms of the Stock Option Plan, the Board is authorized to select the
recipients of options from among those eligible, to establish the number of
shares that may be issued under each option and to take any actions
specifically contemplated or necessary or advisable for the administration of
the Stock Option Plan.
 
  No options may be granted under the Stock Option Plan after July 31, 2005,
which is ten years from the date the Stock Option Plan was originally adopted
and approved by the Board and stockholders of the Company. The Stock Option
Plan will remain in effect until all options granted under the Stock Option
Plan have been exercised or expired. The Board, in its discretion, may
terminate the Stock Option Plan at any time with respect to any shares of
Class B Common Stock for which options have not been granted. The Stock Option
Plan may be amended by the Board without the consent of the stockholders of
the Company, other than as to a material increase in benefits, an increase in
the number of shares that may be subject to options under the Stock Option
Plan or a change in the class of individuals eligible to receive options under
the Stock Option Plan. However, no change in any option previously granted
under the Stock Option Plan may be made which would impair the rights of the
holder of such option without the approval of the holder.
 
                                      86
<PAGE>
 
  Pursuant to the Stock Option Plan, options are exercisable during the period
specified in each option agreement; provided, that no option is exercisable
later than ten years from the date the option is granted. Options generally
have been exercisable over a period of ten years from the grant date and
vested in equal installments over a four or five year period of service with
the Company as an employee, director or consultant. A change in control
generally accelerates the vesting of options granted to employees and some of
the options vest upon an initial public offering or the achievement of
specific business goals or objectives. An option generally must be exercised
within 12 months of a holder ceasing to be involved with the Company as an
employee, director or consultant as a result of death and within 3 months if
the cessation is for other reasons. Shares of Class B Common Stock subject to
forfeited or terminated options again become available for option awards. The
Board may, subject to certain restrictions in the Stock Option Plan, extend or
accelerate the vesting or exercisability of an option or waive restrictions in
an option agreement.
 
  The Stock Option Plan provides that the total number of shares covered by
the Stock Option Plan, the number of shares covered by each option, and the
exercise price per share under each option will be proportionately adjusted in
the event of a recapitalization, stock split, dividend, or a similar
transaction.
 
  No grant of any option will constitute realized taxable income to the
grantee. Upon exercise of the option, the holder will recognize ordinary
income in an amount equal to the excess of the fair market value of the stock
received over the exercise price paid therefor and the tax basis in any shares
of Class B Common Stock received pursuant to the exercise of the option will
be equal to the fair market value of the shares on the exercise date if the
exercise price is paid in cash. The Company will generally have a deduction in
parity with the amount realized by the holder. The Company has the right to
deduct and withhold applicable taxes relating to taxable income realized by
the holder upon exercise of the option and may withhold cash, shares or any
combination in order to satisfy or secure its withholding tax obligation.
 
  As of October 31, 1997, options to purchase a total of 549,000 shares of
Class B Common Stock have been granted. Options for 72,625 shares of Class B
Common Stock have been exercised and options for 476,375 shares remain
outstanding. The outstanding options are for (i) 69,000 shares with an
exercise price of $2.00 per share, (ii) 18,750 shares with an exercise price
of $6.00 per share, (iii) 10,000 shares with an exercise price of $8.00 per
share, (iv) 35,000 shares with an exercise price of $12.00 per share and (v)
343,625 shares with an exercise price of $21.00 per share. The options
exercisable at $2.00 per share are fully vested and held by Ted B. Miller, Jr.
As of December 31, 1997, vested and exercisable options are expected to
include options for (i) 7,750 shares at $6.00 per share and (ii) 8,750 shares
at $12.00 per share.
   
  Options to purchase 177,000 shares of Class B Common Stock have been
committed to individuals involved with the Crown Business. Such options are
expected to be granted in the near future. It is projected that such options
will be for (i) 65,000 shares with an exercise price of $30.00 per share and
(ii) 112,000 shares with an exercise price of $37.54 per share, and that as of
December 31, 1997, such options will be vested and exercisable as to 17,500
shares at $30.00 per share. The exercise prices for these options were equal
to or in excess of the estimated fair value of the Class B Common Stock at the
dates on which the numbers of shares and the exercise prices were determined;
as such, in accordance with the "intrinsic value based method" of accounting
for stock options, the Company will not recognize compensation cost related to
the grant of these options.     
 
  The Company is currently reviewing its stock option plan and other
compensation arrangements in light of its recent acquisition of the Crown
Business. The Company expects to make some changes to the Stock Option Plan,
but there are no definitive proposals at this time. The changes to the Stock
Option Plan could be material.
 
                                      87
<PAGE>
 
                CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
1995 INVESTMENTS
 
  On January 11, 1995, Ted B. Miller, Jr. and Edward C. Hutcheson, Jr.
(collectively, the "Initial Stockholders") acquired 270,000 shares of CTC
Class A Common Stock, par value $.01 per share, for $270,000. Also, on January
11, 1995, pursuant to a Securities Purchase and Loan Agreement, dated as of
January 11, 1995, among CTC, Centennial Fund IV, Berkshire Fund III, A Limited
Partnership (via Berkshire Fund III Investment Corp.), and certain trusts and
natural persons which are now members of Berkshire Investors LLC
(collectively, the "Berkshire Fund III Group") and J. Landis Martin
(collectively, the "CTC Purchasers"), CTC issued to the CTC Purchasers (i)
270,000 shares of CTC Class B Common Stock, par value $.01 per share, for
$270,000, (ii) 730,380 shares of CTC Series A Convertible Preferred Stock, par
value $.01 per share, for $4,382,280 and (iii) $3,867,720 principal amount of
CTC Convertible Secured Subordinated Notes for $3,867,720. As of February
1997, all the CTC Convertible Secured Subordinated Notes had been converted
into 644,620 shares of Company Series A Convertible Preferred Stock. The
proceeds received on January 11, 1995 were used by the Company for the
acquisition of towers and ancillary assets from PCI and for working capital.
 
  Pursuant to a Securities Exchange Agreement (the "Securities Exchange
Agreement"), dated as of April 27, 1995, among the Company, CTC, the Initial
Stockholders and the CTC Purchasers, such parties effectively made CCIC the
holding company of CTC and converted some of the obligations of CTC into
capital stock of CCIC. Transactions pursuant to the Securities Exchange
Agreement included (i) Centennial Fund IV transferring 208,334 shares of CTC
Series A Convertible Preferred Stock to Berkshire Fund III Group in exchange
for $1,250,004 principal amount of CTC Convertible Secured Subordinated Notes,
(ii) Berkshire Fund III Group and J. Landis Martin converting all remaining
CTC Convertible Secured Subordinated Notes held by them ($742,452 principal
amount) into 123,742 shares of CTC Series A Convertible Preferred Stock, (iii)
all the outstanding shares of capital stock of CTC being exchanged for similar
stock of CCIC and (iv) the remaining CTC Convertible Secured Subordinated
Notes ($3,125,268 principal amount) becoming convertible into shares of CCIC
Series A Convertible Preferred Stock, par value $.01 per share ("Series A
Convertible Preferred Stock") (all of which notes were subsequently converted
in February 1997).
 
  As a result of the exchange of CTC capital stock for CCIC capital stock,
each Initial Stockholder received 135,000 shares of Class A Common Stock, par
value $.01 per share, of CCIC ("Class A Common Stock"), Centennial Fund IV
received 216,000 shares of Class B Common Stock and 145,789 shares of Series A
Preferred Stock, Mr. Martin received 41,666 shares of Series A Preferred Stock
and Berkshire Fund III Group received 54,000 shares of Class B Common Stock
and 666,667 shares of Series A Preferred Stock. In July 21, 1995, Robert F.
McKenzie became a party by amendment to the Securities Exchange Agreement and
received 8,333 shares of Series A Preferred Stock.
 
1996 INVESTMENTS
 
  Pursuant to a Securities Purchase Agreement, dated as of July 15, 1996,
among the Company, Berkshire Fund III Group, Centennial Fund IV, J. Landis
Martin, Edward C. Hutcheson, Jr. and Robert F. McKenzie, the Company privately
placed 864,568 shares of its Series B Convertible Preferred Stock, par value
$.01 per share ("Series B Convertible Preferred Stock"), for an aggregate
purchase price of $10,374,816. Berkshire Fund III Group paid $6,000,000 for
500,000 shares, Centennial Fund IV paid $3,724,812 for 310,401 shares, Mr.
Martin paid $500,004 for 41,667 shares, Mr. Hutcheson paid $99,996 for 8,333
shares and Mr. McKenzie paid $50,004 for 4,167 shares. The proceeds received
on July 15, 1996 were used for (i) the purchase of the towers and microwave
and SMR businesses from Motorola in Puerto Rico, (ii) an option payment
relating to the acquisition of TEA and TeleStructures and (iii) working
capital.
 
1997 INVESTMENTS
 
  Pursuant to a Securities Purchase Agreement, dated as of February 14, 1997,
among the Company, Centennial Fund V and Centennial Entrepreneurs Fund V, L.P.
(collectively, the "Centennial Fund V
 
                                      88
<PAGE>
 
Investors" and, together with Centennial Fund IV, the "Centennial Group"),
Berkshire Fund IV, Limited Partnership (via Berkshire Fund IV Investment
Corp.), and certain trusts and natural persons which are members of Berkshire
Investors LLC (collectively, the "Berkshire Fund IV Group" and, together with
Berkshire Fund III Group, the "Berkshire Partners Group"), PNC Venture Corp.,
Nassau Capital Partners II L.P. ("Nassau Capital"), NAS Partners I L.L.C.
("NAS Partners" and, together with Nassau Capital, the "Nassau Group"), Fay,
Richwhite Communications Limited ("Fay Richwhite"), J. Landis Martin and
Robert F. McKenzie, the Company privately placed 3,529,832 shares of its
Series C Convertible Preferred Stock, par value $.01 per share ("Series C
Convertible Preferred Stock"), for an aggregate purchase price of $74,126,472.
Centennial Fund V Investors paid $15,464,001 for 736,381 shares, Berkshire
Fund IV Group paid $21,809,991 for 1,038,571 shares, PNC Venture Corp. paid
$6,300,000 for 300,000 shares, Nassau Group paid an aggregate of $19,499,991
for 928,571 shares, Fay Richwhite paid $9,999,990 for 476,190 shares, Mr.
Martin paid $999,999 for 47,619 shares and Mr. McKenzie paid $52,500 for 2,500
shares. The proceeds received on February 14, 1997 were used by the Company to
fund a portion of its investment in CTI.
 
  In March 1997, Edward C. Hutcheson, Jr. exercised stock options for 69,000
shares of Class B Common Stock. The Company repurchased these shares and
61,687 shares of his Class A Common Stock for $3,422,118.
 
  In May 1997, in connection with the Company's acquisition of the stock of
TeleStructures, TEA and TeleShare, Inc. (the "TEA Companies"), the Company
issued 107,142 shares of Class B Common Stock to the shareholders of the TEA
Companies: 48,214 shares to Bruce W. Neurohr, 48,214 shares to Charles H.
Jones and 10,714 shares to Terrel W. Pugh.
   
  In June 1997, Messrs. Miller and Ivy received special bonuses, related to
their services in structuring and negotiating the CTI Investment, including
arranging the consortium partners who participated with the Company in the CTI
transaction, of $600,000 and $300,000, respectively.     
 
  In August 1997, Robert A. Crown and Barbara Crown sold the assets of Crown
Communications to, and merged CNSI and CMSI with, subsidiaries of the Company.
As consideration for these transactions, the Crowns received a cash payment of
$25.0 million, a promissory note of the Company aggregating approximately
$75.0 million, approximately $2.3 million to pay certain taxes (part of which
amount was paid in September 1997 as a dividend to stockholders of record of
CNSI on August 14, 1997), and 1,465,000 shares of Class B Common Stock. In
addition, the Company assumed approximately $26.0 million of indebtedness of
the Crown Business. The Company repaid the Seller Note in full on October 31,
1997. Robert A. Crown and Barbara Crown are both parties to the Stockholders
Agreement and are subject to its restrictions.
 
  Pursuant to a Securities Purchase Agreement, dated as of August 13, 1997,
among the Company, American Home Assurance Company ("AHA"), New York Life
Insurance Company ("New York Life"), The Northwestern Mutual Life Insurance
Company ("Northwestern Mutual"), PNC Venture Corp., J. Landis Martin and
affiliates of AHA, the Company privately placed of 292,995 shares of its
Senior Convertible Preferred Stock for an aggregate purchase price of
$29,299,500, together with warrants to purchase 117,198 shares of Class B
Common Stock at $37.54 per share (subject to adjustment, including weighted
average antidilution adjustments). AHA and its affiliates paid $15,099,500 for
150,995 shares and warrants to purchase 60,338 shares of Class B Common Stock.
New York Life and Northwestern Mutual each paid $6,000,000 for 60,000 shares
and warrants to purchase 24,000 shares of Class B Common Stock. PNC Venture
Corp. paid $2,000,000 for 20,000 shares and warrants to purchase 8,000 shares
of Class B Common Stock. Mr. Martin paid $200,000 for 2,000 and warrants to
purchase 800 shares of Class B Common Stock. The proceeds received on August
13, 1997 were used by the Company to fund a portion of the Crown Merger and
working capital.
 
  Pursuant to a Securities Purchase Agreement, dated as of October 31, 1997,
among the Company, Berkshire Partners Group, Centennial Fund V Investors,
Nassau Group, Fay Richwhite, Harvard Private Capital Holdings, Inc.
("Harvard"), Prime VIII, L.P. ("Prime") and the prior purchasers of Senior
Convertible Preferred Stock (other than affiliates of AHA), an additional
364,500 shares of Senior Convertible Preferred Stock were issued for an
aggregate purchase price of $36,450,000, together with warrants to purchase
145,800 shares of Class B Common Stock at $37.54 per share (subject to
adjustment, including weighted average antidilution adjustments).
 
                                      89
<PAGE>
 
Berkshire Partners Group paid $3,500,000 for 35,000 shares and warrants to
purchase 14,000 shares of Class B Common Stock. Centennial V Investors paid
$1,000,000 for 10,000 shares and warrants to purchase 4,000 shares of Class B
Common Stock. Nassau Group and Fay Richwhite each paid $2,500,000 for 25,000
shares and warrants to purchase 10,000 shares of Class B Common Stock. Harvard
paid $14,950,000 for 149,500 shares and warrants to purchase 59,800 shares of
Class B Common Stock. Prime paid $5,000,000 for 50,000 shares and warrants to
purchase 20,000 shares of Class B Common Stock. AHA paid $1,500,000 for 15,000
shares and warrants to purchase 6,000 shares of Class B Common Stock. New York
Life paid $300,000 for 3,000 shares and warrants to purchase 1,200 shares of
Class B Common Stock. Northwestern Mutual paid $4,000,000 for 40,000 shares
and warrants to purchase 16,000 shares of Class B Common Stock. PNC Venture
Corp. paid $1,000,000 for 10,000 shares and warrants to purchase 4,000 shares
of Class B Common Stock. J. Landis Martin paid $200,000 for 2,000 shares and
warrants to purchase 600 shares of Class B Common Stock.
 
OTHER TRANSACTIONS
 
  The Company has entered into a services agreement (the "Services Agreement")
with CTI whereby the Company provides CTI with various services relating to
accounting, finance, infrastructure development and management, information
technology and marketing, and whereby the Chief Executive Officer and the
President of the Company each provide their commercial and financial expertise
to CTI. In exchange for such services, the Company is paid an annual fee of
(Pounds)240,000 (subject to adjustment by mutual agreement after the third
contractual year) and is reimbursed for all reasonable out-of-pocket expenses
incurred by the Company in connection with the performance of such services.
Under the Services Agreement, CTI also has an option to receive site
acquisition and development training from the Company for which the Company
will receive additional fees to be separately agreed by the parties.
 
  Castle Transmission Services (Holdings) Ltd ("CTSH"), the parent company of
CTI, and its four major shareholders (each a "CTSH Shareholder"), including
the Company, entered into a Shareholders' Agreement on January 23, 1997,
governing the management and operation of CTSH and its subsidiaries (the "CTSH
Shareholders' Agreement"). The CTSH Shareholders' Agreement provides, among
other things, for (i) unanimous approval by all CTSH Shareholders (for so long
as such CTSH Shareholder owns at least 15% of the share capital of CTSH) as to
material transactions by CTSH or a subsidiary, (ii) standstill restrictions on
the transfer of shares in CTSH by any of the CTSH Shareholders prior to the
earlier of January 23, 2000 or a public offering of those shares on any stock
exchange or trading association, subject to limited exceptions, (iii) a right
for CTSH Shareholders who together own not less than 40% of the shares in
issue to require the listing of the entire share capital of CTSH on a stock
exchange or trading association, (iv) certain rights of preemption after
January 23, 2000, (v) certain demand registration rights at any time after
January 23, 2000, and (vi) "piggyback" registration rights whereby a CTSH
Shareholder may elect to participate, subject to certain conditions, in
certain proposed public offerings.
 
  Robert J. Coury, a director of Crown Communication, and Crown Communication
have entered into a 15-month management consulting agreement beginning in
October 1997, with compensation set at $20,000 for the first month and $10,000
per month thereafter. In addition, pursuant to a Memorandum of Understanding
Regarding Management and Governance of CCIC and Crown Communication, dated as
of August 15, 1997, Mr. Coury received options for 15,000 shares of Class B
Common Stock. As of December 31, 1997, 7,500 of these options have vested. In
connection with the Crown Merger, Mr. Coury acted as financial advisor to the
Crowns and received a fee for such services, paid by the Crowns.
 
  The Company leases office space in a building owned by its Vice Chairman and
Chief Executive Officer. Lease payments for such office space amounted to
$50,000 and $22,000 for the years ended December 31, 1996 and 1995,
respectively. The amount of space leased increased from 6,497 square feet at
$23.80 per square foot (or $154,836 in annual rent) to 19,563 square feet at
$16.00 per square foot (or $313,008 in annual rent) pursuant to a lease
agreement effective November 1, 1997. The lease term is for a period of five
years with an option to terminate in the third year or to renew at $18.40 per
square foot. The lease also provides the Company a right of
 
                                      90
<PAGE>
 
first refusal on the entire fifth floor of the building. Interstate Realty
Corporation, a company owned by the Company's Vice Chairman and Chief
Executive Officer, will receive a commission of $62,000 in connection with
this new lease.
 
  Crown Communication leases its equipment storage and handling facility in
Pittsburgh from Idlewood Road Property Company ("Idlewood"), a Pennsylvania
limited partnership. HFC Development Corp., a Pennsylvania corporation owned
by Mr. Crown's parents, is the general partner of Idlewood. The annual rent
for the property is $60,000.
 
                                      91
<PAGE>
 
                         DESCRIPTION OF CAPITAL STOCK
 
  The authorized capital stock of the Company consists of 208,313 shares of
Class A Common Stock, 11,302,796 shares of Class B Common Stock (the Class A
Common Stock and Class B Common Stock collectively, "Common Stock") and
6,435,228 shares of the preferred stock, $.01 par value per share ("Preferred
Stock"). As of October 31, 1997, there were 208,313 shares of Class A Common
Stock, 1,873,433 shares of Class B Common Stock and 6,435,228 shares of
Preferred Stock outstanding.
 
CLASS A COMMON STOCK AND CLASS B COMMON STOCK
 
Voting Rights
 
  Each share of Class B Common Stock is entitled to one vote and each share of
Class A Common Stock is entitled to the number of votes per share that equals
the number of shares of Class B Common Stock into which each share of Class A
Common Stock is convertible (currently set at 1.523148 shares of Class B
Common Stock for each share of Class A Common Stock and referred to as "Class
A Common Stock as converted") on all matters submitted to a vote of the
stockholders. There is no cumulative voting. The Class A Common Stock and
Class B Common Stock vote together as a single class on all matters presented
for a vote of the stockholders, except as provided under the Delaware General
Corporation Law (the "DGCL"). All the outstanding shares of Class A Common
Stock are held by the Initial Stockholders. The holders of Class A Common
Stock, voting as a separate class, are entitled to elect one director. All the
outstanding shares of Class B Common Stock are held by directors, executive
officers, other employees and affiliates of the Company or its subsidiaries.
 
Dividends
 
  Each share of Class A Common Stock and of Class B Common Stock is entitled
to receive dividends if, as and when declared by the Board out of funds
legally available therefor. Identical dividends, if any, must be paid on both
the Class B Common Stock and the Class A Common Stock as converted at any time
that dividends are paid on either, except that dividends payable on shares of
the Class B Common Stock are payable only in shares of the Class B Common
Stock and dividends payable on shares of the Class A Common Stock are payable
only in shares of the Class A Common Stock.
 
Convertibility
 
  Each share of Class A Common Stock is convertible at any time at the
holder's option into 1.523148 shares of fully paid and nonassessable shares of
Class B Common Stock. Shares of Class A Common Stock are convertible at the
Company's option into shares of Class B Common Stock at the rate described
above, simultaneously with the conversion of outstanding shares of Preferred
Stock pursuant to the mandatory conversion provisions as discussed below under
"--Preferred Stock." In the case of any reorganization or reclassification of
the capital stock that entitles holders of Class B Common Stock to receive
stock, securities or assets in exchange for Class B Common Stock, then similar
provision must be made for holders of Class A Common Stock as converted.
Shares of Class B Common Stock are not convertible.
 
Liquidation Rights
 
  In the event of the dissolution of the Company, after satisfaction of
amounts payable to creditors and distribution to the holders of outstanding
Preferred Stock, if any, of amounts to which they may be preferentially
entitled, holders of Class A Common Stock as converted and Class B Common
Stock are entitled to share ratably in the assets available for distribution
to the stockholders.
 
Other Provisions
 
  There are no preemptive rights to subscribe for any additional securities
which the Company may issue, and there are no redemption provisions or sinking
fund provisions applicable to the Class A Common Stock or
 
                                      92
<PAGE>
 
Class B Common Stock, nor is either class subject to calls or assessments by
the Company. All outstanding shares of Common Stock are legally issued, fully
paid and nonassessable.
 
PREFERRED STOCK
 
General
 
  The authorized Preferred Stock is divided into 1,383,333 shares designated
Series A Convertible Preferred Stock, 864,568 shares designated Series B
Convertible Preferred Stock, 3,529,832 shares designated Series C Convertible
Preferred Stock and 657,495 shares designated Senior Convertible Preferred
Stock. All the authorized Preferred Stock is outstanding.
 
  The Board does not have the authority to amend the Amended Certificate or to
take other corporate action without approval by the holders of at least 66.67%
of the outstanding shares of Preferred Stock (calculated on an "as converted"
share-for-share basis), voting or consenting together, if such amendment or
corporate action would adversely affect or significantly alter rights of
holders of Preferred Stock; create or authorize the creation of additional
shares of Class A Common Stock or capital stock senior to or on a parity with
any Preferred Stock or increase the authorized amount of Preferred Stock; or
permit the grant of warrants or options except Common Stock issuable on
conversion of Preferred Stock or options granted pursuant to the Plan.
Furthermore, for so long as 25% of the aggregate number of shares of Preferred
Stock originally issued remains outstanding, the Company will not without the
approval of at least 66.67% of the holders of the then outstanding Preferred
Stock as converted: (i) issue debt securities which are convertible into,
exchangeable for or otherwise entitle the holder thereof to receive equity
securities, other than securities issued in connection with borrowing by the
Company from banks or other institutional lenders; (ii) redeem, repurchase or
acquire for value any shares of Common Stock; or (iii) merge or consolidate
with another entity if at least a majority of the voting power of the Company
(or the surviving entity) would not be owned by the holders of the capital
stock of the Company before such merger or consolidation. Finally, no
amendments or modifications to or waivers of the Preferred Stock may be made
without the written consent or affirmative vote of holders of at least 66.67%
of the then outstanding Preferred Stock as converted. The issuance of
Preferred Stock, while providing flexibility in connection with possible
financings, acquisitions and other corporate transactions, could, under
certain circumstances, make it more difficult for a third party to gain
control of the Company. Further, any change to a provision involving the
maturity redemption, mandatory conversion or a significant modification
relating to the Senior Convertible Preferred Stock is subject to approval of
66.67% of the outstanding shares of the Senior Convertible Preferred Stock
(taking into account holders of only Senior Convertible Preferred Stock other
than Class B Common Stock held as a result of converting Senior Convertible
Preferred Stock or the exercise of warrants issued in conjunction with the
issuance of Senior Convertible Preferred Stock (the "Required Senior Preferred
Holders")).
 
  Voting Rights. The Preferred Stock will vote together with all classes and
series of capital stock except as specified herein or under the DGCL. Each
share of Preferred Stock entitles the holder thereof to such number of votes
per share as equals the number of Class B Common Stock into which each share
of Preferred Stock is then convertible.
 
  Dividends. Subject to the terms of the Indenture, the holders of the Senior
Convertible Preferred Stock are entitled to receive dividends at a compounded
rate of 12.5% per share per annum based upon (i) $100 per share (subject to
adjustment) and (ii) accrued unpaid cumulative dividends. Such dividends
accrued will be cumulative until paid, and if any such accrued cumulative
dividends are not declared and paid, the deficiency will first be paid in full
before any dividend or other distribution is paid or declared with respect to
the Company's capital stock (other than Senior Convertible Preferred Stock)
now or hereinafter outstanding. Further, any such dividend not paid in cash
within five days of the annual dividend date shall be paid only in the form of
Senior Convertible Preferred Stock.
 
  Each share of the Series A Convertible Preferred Stock, Series B Convertible
Preferred Stock and Series C Convertible Preferred Stock (collectively, the
"Series Convertible Preferred Stock") is entitled to receive
 
                                      93
<PAGE>
 
dividends if, as and when declared by the Board out of funds legally available
therefor and on a parity with dividends with respect to Class B Common Stock
on an as converted basis. No dividends may be declared by the Board on any
class of stock ranking junior to the Senior Convertible Preferred Stock unless
full cumulative dividends have been or contemporaneously are declared and paid
with respect to the Senior Convertible Preferred Stock. No dividends shall be
paid on Series Convertible Preferred Stock or Common Stock without the
approval of the Required Senior Preferred Holders.
 
  Convertibility. Each share of Senior Convertible Preferred Stock plus
accrued unpaid dividends may be converted at the holder's option into shares
of Class B Common Stock. The conversion ratio equals $100 per share of Senior
Convertible Preferred Stock plus accrued unpaid dividends divided by $37.54
(subject to adjustment in the case of stock dividends, stock splits,
reorganizations, reclassifications or similar events affecting the Class B
Common Stock). The $37.54 amount will be reduced to 85% of the price per share
to the public if the Company consummates an initial registered public offering
of Class B Common Stock with a price below $44.17 per share (subject to
adjustment) and all the shares of Senior Convertible Preferred Stock convert
in connection with such offering. Weighted average antidilution protection is
also applicable to the $37.54 amount if Class B Common Stock is effectively
issued below such price (as adjusted) in a nonpublic offering.
 
  Each share of Series Convertible Preferred Stock may be converted at the
holder's option into Class B Common Stock on a share-for-share basis (subject
to adjustment in the case of stock dividends, stock splits, reclassifications,
reorganizations and similar events affecting the Class B Common Stock).
 
  All the Preferred Stock is subject to mandatory conversion upon a firm
commitment underwritten public offering in which aggregate proceeds to the
Company are at least $30 million and the price per share to the public of
Class B Common Stock is at least $100 per share (as adjusted for stock splits
and similar events). The conversion ratios for all Preferred Stock are subject
to weighted average antidilution protection and to adjustment for stock
splits, stock dividends, reorganizations, reclassifications and similar
transactions.
 
  Board Size and Seats. The Company may not, without the written consent or
affirmative vote of at least 66.67% of the then outstanding shares of
Preferred Stock (on an as converted basis) consenting or voting together (as
the case may be), separately from all other classes and series of capital
stock, increase the maximum number of directors constituting the Board in
excess of 11. In addition, holders of Preferred Stock voting together,
separately from all other classes and series of capital stock, are entitled to
elect five directors, and the holders of Preferred Stock and both classes of
Common Stock, voting together as a single class, are entitled to elect five
directors (with the Preferred Stock entitled to vote on an as converted
basis). The holders of Class A Common Stock are entitled to elect one
director.
 
Senior Convertible Preferred Stock
 
  In August 1997, the Board authorized the issuance and sale of 292,995 shares
of Senior Convertible Preferred Stock, par value $.01 per share, designated as
the "Senior Convertible Preferred Stock." In October 1997, the Board
authorized the issuance and sale of an additional 364,500 shares of Senior
Convertible Preferred Stock.
 
  Rank. The Senior Convertible Preferred Stock ranks, with respect to dividend
rights and rights on liquidation, senior to the Common Stock and the Series
Convertible Preferred Stock.
 
  Liquidation Rights. In the event of the dissolution, liquidation or winding
up of the affairs of the Company (including a merger, reorganization or
consolidation involving a transfer of 50% of the voting power of the Company),
after satisfaction of amounts payable to creditors, holders of shares of
Senior Convertible Preferred Stock are entitled to receive distributions in an
amount equal to the greater of (i) $100 (subject to adjustment), plus, in the
case of each share, accrued and unpaid cumulative dividends thereon and such
additional incremental amount sufficient to produce an annualized cumulative
internal rate of return of 18%, and (ii) such amount per share that such
holders would receive if such shares were converted into shares of Class B
Common Stock
 
                                      94
<PAGE>
 
immediately prior to the dissolution, liquidation or winding up of the affairs
of the Company, in preference to any payment to holders of Common Stock,
Series Convertible Preferred Stock or any other securities ranking junior to
the Senior Convertible Preferred Stock.
 
  Other Provisions. There are no preemptive rights to subscribe for any
additional securities which the Company may issue, and there are no sinking
fund provisions applicable to the Senior Convertible Preferred Stock, nor is
the Senior Convertible Preferred Stock subject to assessments by the Company.
Fifty percent of the Senior Convertible Preferred Stock is subject to a one
time call on or before August 31, 1998 at $100 per share plus an annualized
internal rate of return of 18%. The holders of Senior Convertible Preferred
Stock will have the right to require redemption on the earlier of 91 days
after the tenth anniversary date of issuance of the Notes or May 15, 2008 at a
price equal to $100 per share plus accrued cumulative unpaid dividends.
Further, unconverted Senior Convertible Preferred Stock will mature on the
earlier of 91 days after the tenth anniversary date of issuance of the Notes
or May 15, 2008 and is redeemable at $100 per share plus accrued cumulative
unpaid dividends; provided, the price shall be increased to the amount the
holders of Senior Convertible Preferred Stock would have received if there is
a dissolution, liquidation or winding up of the Company within 12 months of
the redemption. The $100 per share redemption price for Senior Convertible
Preferred Stock is subject to adjustment for stock splits, stock dividends,
reorganizations, reclassifications and similar events.
 
Series A Convertible Preferred Stock
 
  In April 1995, the Board authorized the exchange by CTC stockholders of
their capital stock in CTC for capital stock in the Company with the same
designations, rights and preferences, including shares of Preferred Stock, par
value $.01 per share, designated as the "Series A Convertible Preferred
Stock." Of the 1,383,333 shares of Series A Convertible Preferred Stock
outstanding, 862,455 shares were issued in connection with the exchange
(including 132,075 shares issued on conversion of the Company's Convertible
Secured Subordinated Notes) and 520,878 of such shares were issued upon the
conversion of the Company's Convertible Secured Subordinated Notes in February
1997.
 
  Rank. The Series A Convertible Preferred Stock ranks, with respect to
dividend rights, senior to the Common Stock, on parity with the Series B
Convertible Preferred Stock and Series C Convertible Preferred Stock and
junior to the Senior Convertible Preferred Stock. The Series A Convertible
Preferred Stock ranks, with respect to rights on liquidation and redemption,
senior to the Common Stock and junior to the Series B Convertible Preferred
Stock, Series C Convertible Preferred Stock and Senior Convertible Preferred
Stock.
 
  Liquidation Rights. In the event of the dissolution, liquidation or winding
up of the affairs of the Company (including a merger, reorganization or
consolidation involving a transfer of 50% of the voting power of the Company),
after satisfaction of amounts payable to creditors, holders of shares of
Series A Convertible Preferred Stock are entitled to receive distributions in
an amount equal to the greater of (i) $6.00 (subject to adjustment) and (ii)
such amount per share that such holders would receive if such shares were
converted into shares of Class B Common Stock immediately prior to the
dissolution, liquidation or winding up of the affairs of the Company, in
preference to any payment to holders of Common Stock or any other securities
ranking junior to the Series A Convertible Preferred Stock.
 
  Other Provisions. There are no preemptive rights to subscribe for any
additional securities which the Company may issue, and there are no sinking
fund provisions applicable to the Series A Convertible Preferred Stock, nor is
the Series A Convertible Preferred Stock subject to calls or assessments by
the Company. The holders of Series A Convertible Preferred Stock have the
right to require the redemption on the earlier of 91 days after the tenth
anniversary date of issuance of the Notes or May 15, 2008 at $6.00 per share
(subject to adjustment) plus declared unpaid dividends.
 
Series B Convertible Preferred Stock
 
  In July 1996, the Board of Directors authorized the issuance and sale of
864,568 shares of Preferred Stock, par value $.01 per share, designated as the
"Series B Convertible Preferred Stock."
 
                                      95
<PAGE>
 
  Rank. The Series B Convertible Preferred Stock ranks, with respect to
dividend rights, senior to the Common Stock, on parity with the Series A
Convertible Preferred Stock and Series C Convertible Preferred Stock and
junior to the Senior Convertible Preferred Stock. The Series B Convertible
Preferred Stock ranks, with respect to rights on liquidation and redemption,
senior to the Common Stock and Series A Convertible Preferred Stock, on parity
with the Series C Convertible Preferred Stock and junior to the Senior
Convertible Preferred Stock.
 
  Liquidation Rights. In the event of the dissolution, liquidation or winding
up of the affairs of the Company (including a merger, reorganization or
consolidation involving a transfer of 50% of the voting power of the Company),
after satisfaction of amounts payable to creditors, holders of shares of
Series B Convertible Preferred Stock are entitled to receive distributions in
an amount equal to the greater of (i) $12.00 (subject to adjustment) and (ii)
such amount per share that such holders would receive if such shares were
converted into shares of Class B Common Stock immediately prior to the
dissolution, liquidation or winding up of the affairs of the Company, in
preference to any payment to holders of Common Stock or any other securities
ranking junior to the Series B Convertible Preferred Stock.
 
  Other Provisions. There are no preemptive rights to subscribe for any
additional securities which the Company may issue, and there are no sinking
fund provisions applicable to the Series B Convertible Preferred Stock, nor is
the Series B Convertible Preferred Stock subject to calls or assessments by
the Company. The holders of Series B Convertible Preferred Stock have the
right to require the redemption on the earlier of 91 days after the tenth
anniversary date of issuance of the Notes or May 15, 2008 at $12.00 per share
(subject to adjustment) plus declared unpaid dividends.
 
Series C Convertible Preferred Stock
 
  In February 1997, the Board of Directors authorized the issuance and sale of
3,529,832 shares of Preferred Stock, par value $.01 per share, designated as
the "Series C Convertible Preferred Stock."
 
  Rank. The Series C Convertible Preferred Stock ranks, with respect to
dividend rights, senior to the Common Stock, on parity with the Series A
Convertible Preferred Stock and Series B Convertible Preferred Stock and
junior to the Senior Convertible Preferred Stock. The Series C Convertible
Preferred Stock ranks, with respect to rights on liquidation and redemption,
senior to the Common Stock and Series A Convertible Preferred Stock, on parity
with the Series B Convertible Preferred Stock and junior to the Senior
Convertible Preferred Stock.
 
  Liquidation Rights. In the event of the dissolution, liquidation or winding
up of the affairs of the Company (including a merger, reorganization or
consolidation involving a transfer of 50% of the voting power of the Company),
after satisfaction of amounts payable to creditors, holders of shares of
Series C Convertible Preferred Stock are entitled to receive distributions in
an amount equal to the greater of (i) $21.00 (subject to adjustment) and (ii)
such amount per share that such holders would receive if such shares were
converted into shares of Class B Common Stock immediately prior to the
dissolution, liquidation or winding up of the affairs of the Company, in
preference to any payment to holders of Common Stock or any other securities
ranking junior to the Series C Convertible Preferred Stock.
 
  Other Provisions. There are no preemptive rights to subscribe for any
additional securities which the Company may issue and there are no sinking
fund provisions applicable to the Series C Convertible Preferred Stock, nor is
the Series C Convertible Preferred Stock subject to calls or assessments by
the Company. The holders of Series C Convertible Preferred Stock have the
right to require the redemption on the earlier of 91 days after the tenth
anniversary date of issuance of the Notes or May 15, 2008 at $21.00 per share
(subject to adjustment) plus declared unpaid dividends.
 
WARRANTS
 
  In connection with the offering of the Senior Convertible Preferred Stock in
August 1997 and October 1997, the Company issued warrants to purchase an
aggregate of 262,998 shares of Class B Common Stock at a price
 
                                      96
<PAGE>
 
of $37.54 per share, provided that the price per share shall be reduced to 85%
of the price per share to the public if the Company consummates an initial
registered public offering of Class B Common Stock with a price below $44.17
per share. The exercise price is subject to weighted average antidilution
protection on terms similar to the Preferred Stock conversion price. These
warrants are exercisable at any time prior to August 16, 2007, in the case of
the warrants issued in August 1997, and October 31, 2007, in the case of the
warrants issued in October 1997.
 
STOCKHOLDERS AGREEMENT
 
  Pursuant to the Amended and Restated Stockholders Agreement, dated as of
August 15, 1997, among the Company, the Initial Stockholders, Robert A. Crown
and Barbara Crown (together with the Initial Stockholders, the "Individual
Stockholders") and the other major investors (the "Investors") in the
Company's capital stock, the parties agreed to certain rights and restrictions
with respect to the shares of the Company's capital stock (the "Shares") they
hold, including the following:
 
  Transfer Restrictions. Subject to certain limited exceptions, neither of the
Crowns (so long as either of them is employed by the Company or any of its
subsidiaries or affiliates) nor the Initial Stockholders shall dispose of any
Shares except to the Company or as provided in the Stockholders Agreement.
 
  Rights of First Refusal. The Stockholders Agreement includes various rights
of first refusal in the event an Individual Stockholder or an Investor
(collectively, "Investment Parties") proposes to transfer Shares to a third
party. The specific terms of the rights of first refusal vary depending upon
whether the Shares are being transferred by the Crowns, by an Initial
Stockholder or by an Investor, but in each case the right provides that the
nontransferring parties or the Company have a purchase right before such
proposed transfer may be consummated.
 
  Come-Along Rights. The Stockholders Agreement includes "come-along" rights
in the event of certain proposed transfers of Shares by an Investment Party.
Following application of the right of first refusal procedures described
above, each party to the Stockholders Agreement has the right to include its
Shares (or pro rata portion thereof) in the proposed transfer triggering the
right of first refusal.
 
  Take-Along Rights. The Stockholders Agreement provides that if, at any time
prior to a Qualified Public Offering (defined as a firm commitment
underwriting of Common Stock in which the per share offer price is at least
$100 and the Company receives at least $30,000,000 in net proceeds),
Investment Parties holding at least 66.67% of the Shares owned by all
Investment Parties (such persons being referred to as the "Take Along Group")
determine to sell or exchange (in a business combination or otherwise) 50% or
more of the total number of Shares then issuable or outstanding, then, upon
written notice of the Take Along Group, each other Investment Party shall be
obligated to sell that percentage of its Shares that is equal to the aggregate
percentage of the Take Along Group's Shares being sold or exchanged by the
Take Along Group in the same transaction.
 
  Right to Call and Put Securities. The Stockholders Agreement provides the
Company and the Investment Parties with certain call rights on the Shares of
Ted B. Miller, Jr. in the event his employment terminates for any reason prior
to a Qualified Public Offering. In addition, Mr. Miller has certain put rights
with respect to his Shares if his employment is terminated without cause, or
by virtue of his death, disability or retirement in accordance with Company
policy.
 
  Designation of Nominees by Crowns and by Investors. So long as the Crowns or
certain of their permitted transferees among their families or their heirs
shall have in the aggregate a 5% or greater interest in the Common Stock of
the Company, Robert A. Crown, Barbara Crown and/or such transferees shall have
the right to designate one nominee for election as a director of the Company.
The Company has committed to using its best efforts to reduce the 5% target
amount to a 2.5% target amount. Of the five directors to be elected by holders
of the Company's Preferred Stock pursuant to the terms contained in the
Amended Certificate, in addition to the director to be nominated by the
Crowns, (i) Centennial Group has the right to designate two nominees for
election as a director of the Company; (ii) certain entities affiliated with
Berkshire Partners Group have the right
 
                                      97
<PAGE>
 
to designate two nominees for election as a director of the Company; and (iii)
Nassau Group has the right to designate one nominee for election as a director
of the Company. At each meeting, or written action in lieu of a meeting of
stockholders of the Company, at or by which directors nominated by the Crowns
or by the holders of Preferred Stock, voting separately, are to be elected,
each Investor and Individual Stockholder shall vote all of its Shares to elect
as directors of the Company, such nominees.
 
  The Stockholders Agreement also provides for the designation of four other
directors by the agreement of the Individual Stockholders and Investors as a
group holding 66.67% of the outstanding capital stock of the Company entitled
to vote in the election of directors (calculated on an "as converted" basis).
 
  Right of First Offer. The Stockholders Agreement provides that the Company
shall, prior to any issuance by the Company of certain of its securities
(other than debt securities with no equity feature) and subject to certain
ownership conditions, offer to certain Investors and Individual Stockholders
the right to purchase all such securities for cash at an amount equal to the
price or other consideration for which such securities are to be issued.
 
  Covenants. The Company is also subject to a number of negative covenants
under the Stockholders Agreement, including, among other things, limitations
on liens, indebtedness, investments, distributions or related party
transactions.
 
  Registration Rights. The Stockholders Agreement provides that, at any time
after the earliest of (i) six months after the first registration statement
covering a public offering of the Company's securities shall have become
effective, (ii) six months after the Company shall have become a reporting
company under the Exchange Act and (iii) July 1, 1999, the Investors and
Individual Stockholders holding at least 33% of the restricted stock then
issuable or outstanding may require the Company to register such shares under
the Securities Act on two occasions, provided that the reasonably anticipated
net proceeds to such holders would exceed $5.0 million on each occasion.
 
  The Stockholders Agreement also grants registration rights whereby the
Investors and Stockholders holding 17.5% of the shares of restricted stock
may, at any time the Company is eligible to file a registration statement on
Form S-3, request the Company on five occasions to use its best efforts to
file a registration statement covering the shares specified in such notice, as
long as the reasonably anticipated price to the public of such offering would
exceed $1.0 million on each occasion.
 
  The Stockholders Agreement also provides for unlimited piggyback
registration rights. Pursuant to the Stockholders Agreement, each time the
Company proposes to register its securities under the Securities Act for sale
to the public, whether for its own account or for the account of other
securityholders or both, it will give written notice to the Investors and
Individual Stockholders holding restricted stock to allow their participation
in the registration, unless the managing underwriter of the offering
determines that the total number of such securities to be registered will
adversely effect the marketing of the securities to be sold by the Company. In
such case, the securities proposed to be included by such requesting holders
of restricted stock will be reduced on a pro rata basis, unless any shares to
be included in such offering are for the account of any person other than the
Company or the requesting holders of restricted stock.
 
  The Company has agreed to pay the costs and expenses incurred in connection
with each demand and piggyback registration and each registration on Form S-3,
other than underwriting discounts and commissions.
 
  Term. The Stockholders Agreement will terminate immediately prior to a firm
commitment underwritten public offering pursuant to an effective registration
statement on Form S-1 (or its equivalent). However, the Stockholders Agreement
provides that so long as the Crowns or their permitted transferees have in the
aggregate a 5% or greater interest in the Company's Common Stock, the Crowns
or such transferees shall continue to have the right to designate one nominee
(or a successor to such nominee) for election as a director of the Company
despite the agreement otherwise terminating. The Company has committed to
using its best efforts to reduce the 5% target amount to a 2.5% target amount.
The Stockholders Agreement further provides that the Investors and Individual
Stockholders will vote their shares to elect the Crowns' nominee as a
director.
 
                                      98
<PAGE>
 
                          OWNERSHIP OF CAPITAL STOCK
 
  The table below sets forth, as of October 31, 1997, certain information with
respect to the beneficial ownership of Capital Stock by (i) each person who is
known by the Company to be the beneficial owner of more than 5% of any class
or series of Capital Stock of the Company and (ii) each of the directors and
executive officers of the Company and all directors and executive officers as
a group. As of that date, the Company had outstanding the following amounts:
Class A Common Stock--208,313 shares; Class B Common Stock--1,873,433 shares;
Series A Preferred Stock--1,383,333 shares; Series B Preferred Stock--864,568
shares; Series C Preferred Stock--3,529,832 shares; and Senior Convertible
Preferred Stock--657,495 shares. Each share of Class A Common Stock is
convertible into 1.523148 shares of Class B Common Stock. This table also
gives effect to shares that may be acquired pursuant to options and
convertible preferred stock, as described in the footnotes below.
 
<TABLE>
<CAPTION>
                                                                                                PERCENTAGE OF
                                                                                    FULLY       TOTAL VOTING
                                                                                   DILUTED        POWER OF
                                                    NUMBER OF     PERCENTAGE OF    CLASS B      FULLY DILUTED
                                                      SHARES          CLASS        COMMON          CLASS B
 EXECUTIVE OFFICERS AND                            BENEFICIALLY   BENEFICIALLY      STOCK          COMMON
      DIRECTORS(A)             TITLE OF CLASS        OWNED(B)         OWNED     EQUIVALENT(C)       STOCK
 ----------------------        --------------      ------------   ------------- -------------   -------------
<S>                       <C>                      <C>            <C>           <C>             <C>
Ted B. Miller, Jr. .....  Class A Common Stock        135,000(d)       64.8%        205,625          3.6%
                          Class B Common Stock(e)      81,500           4.2         194,000
David L. Ivy............  Class B Common Stock(f)      23,750           1.3          95,000          0.9
Charles C. Green, III...  Class B Common Stock(g)         --            --           50,000            *
John L. Gwyn............  Class B Common Stock(h)         500             *          45,500            *
Robert A. Crown(i)......  Class B Common Stock      1,465,000          78.1       1,465,000         13.2
Edward C. Hutcheson,
 Jr.(j).................  Class A Common Stock         73,313          35.2         111,667          1.1
                          Class B Common Stock(k)         --            --            5,000
                          Series B Preferred Stock      8,333             *           8,333
J. Landis Martin(l).....  Class B Common Stock(m)       4,875             *          19,500          1.5
                          Series A Preferred Stock     41,666           3.0          41,666
                          Series B Preferred Stock     41,667           4.8          41,667
                          Series C Preferred Stock     47,619           1.3          47,619
                          Senior Preferred Stock        4,000             *          12,400(n)
Robert F. McKenzie(o)...  Class B Common Stock(p)       4,875             *          19,500            *
                          Series A Preferred Stock      8,333             *           8,333
                          Series B Preferred Stock      4,167             *           4,167
                          Series C Preferred Stock      2,500             *           2,500
Directors and executive
 officers as a group
 (8 persons total)......  Class A Common Stock        208,313         100.0         317,292         17.1
                          Class B Common Stock(q)   1,580,500          80.0       1,893,500
                          Series A Preferred Stock     49,999           3.6          49,999
                          Series B Preferred Stock     54,167           6.3          54,167
                          Series C Preferred Stock     50,119           1.4          50,119
                          Senior Preferred Stock        4,000             *          12,400(r)
Berkshire Fund III, A
 Limited
 Partnership(s).........  Class B Common Stock         51,309           2.7          51,309         11.0
                          Series A Preferred Stock    633,444          45.8         633,444
                          Series B Preferred Stock    475,082          55.0         475,082
                          Senior Preferred Stock       17,968           2.7          55,051(t)
Berkshire Fund IV,
 Limited
 Partnership(s).........  Series C Preferred Stock    944,156          26.7         944,156          8.9
                          Senior Preferred Stock       14,627           2.2          44,815(u)
Berkshire Investors
 LLC(s).................  Class B Common Stock          2,691             *           2,691            *
                          Series A Preferred Stock     33,223           2.4          33,223
                          Series B Preferred Stock     24,918           2.9          24,918
                          Series C Preferred Stock     94,415           2.7          94,415
                          Senior Preferred Stock        2,405             *           7,368(v)
Centennial Fund IV,
 L.P.(w)................  Class B Common Stock        216,000          11.5         216,000         10.8
                          Series A Preferred Stock    666,667          48.2         666,667
                          Series B Preferred Stock    310,401          35.9         310,401
Centennial Fund V,
 L.P.(w)................  Series C Preferred Stock    714,286          20.2         714,286          6.7
                          Senior Preferred Stock        9,700           1.5          29,719(x)
Centennial Entrepreneurs
 Fund V, L.P.(w)........  Series C Preferred Stock     22,095             *          22,095            *
                          Senior Preferred Stock          300             *             919(y)
Nassau Capital Partners
 II, L.P.(z)............  Series C Preferred Stock    922,831          26.1         922,831          9.0
                          Senior Preferred Stock       24,845           3.8          76,121(aa)
NAS Partners I,
 L.L.C.(z)..............  Series C Preferred Stock      5,740             *           5,740            *
                          Senior Preferred Stock          155             *             475(bb)
Fay, Richwhite
 Communications
 Limited(cc)............  Series C Preferred Stock    476,190          13.5         476,190          5.0
                          Senior Preferred Stock       25,000           3.8          76,596(dd)
</TABLE>
 
                                                  (footnotes on following page)
 
                                      99
<PAGE>
 
(footnotes from preceding page)
 
- --------
 * Less than 1%.
(a) Except as otherwise indicated, the address of each person named in this
    table is c/o Crown Castle International Corp., 510 Bering Drive, Suite
    500, Houston, TX 77057.
(b) In determining the number and percentage of shares beneficially owned by
    each person, shares that may be acquired by such person pursuant to
    options, convertible notes or convertible preferred stock exercisable or
    convertible within 60 days of the date hereof are deemed outstanding for
    purposes of determining the total number of outstanding shares for such
    person and are not deemed outstanding for such purpose for all other
    stockholders. To the best of the Company's knowledge, except as otherwise
    indicated, beneficial ownership includes sole voting and dispositive power
    with respect to all shares.
(c) Includes the full amounts of options of Class B Common Stock that have
    been granted, whether vested and exercisable or not. Each share of Class A
    Common Stock is shown as converted into 1.523148 shares of Class B Common
    Stock. For the Senior Convertible Preferred Stock sold in July 1997, a
    conversion price of $37.54 and accrued dividends through October 31, 1997,
    is assumed, while for the Senior Convertible Preferred Stock sold in
    October 1997, a conversion price of $37.54 is assumed.
(d) Mr. Miller holds 121,870 shares of Class A Common Stock personally and
    13,130 shares of Class A Common Stock are held in trust for the benefit of
    his children.
(e) Includes 81,500 options which have vested or will vest on December 31,
    1997.
(f) Includes 13,750 options which have vested or will vest on December 31,
    1997.
(g) Represents 50,000 options granted to Mr. Green which are not yet
    exercisable.
(h) Includes 45,000 options granted to Mr. Gwyn which are not yet exercisable.
(i) Includes 739,000 shares owned by Mr. Crown, 701,000 shares owned by his
    spouse, over which she has sole voting and dispositive power, and 25,000
    shares that are jointly owned. Mr. Crown's principal business address is
    c/o Crown Communication Inc., Penn Center West, Building #3, Suite 229,
    Pittsburgh, PA 15276.
(j) Mr. Hutcheson's principal business address is 5599 San Felipe, Suite 301,
    Houston, TX 77056.
(k) Represents 5,000 options granted to Mr. Hutcheson which are not yet
    exercisable.
(l) Mr. Martin's principal business address is c/o Tremont Corporation, 1999
    Broadway, Suite 4300, Denver, CO 80202.
(m) Includes 4,875 options which have vested.
(n) Includes warrants for 1,600 shares of Class B Common Stock.
(o) Mr. McKenzie's principal business address is 60 Kearney Street, Denver, CO
    80220.
(p) Includes 1,250 options which have vested.
(q) Includes 1,974,808 options which have vested or will vest by December 31,
    1997.
(r) Includes warrants for 1,600 shares of Class B Common Stock.
(s) Berkshire Partners Group has approximately 21.4% of the total voting power
    of the Class B Stock on a fully diluted basis. Carl Ferenbach, the
    Chairman of the Board of Directors of the Company, and Garth H. Greimann,
    a director of the Company, are Managing Directors of Berkshire Fund III, A
    Limited Partnership, and Berkshire Fund IV, Limited Partnership. The
    principal business address of the Berkshire Partners Group is c/o
    Berkshire Partners LLC, One Boston Place, Suite 3300, Boston, MA 02108-
    4401.
(t) Includes warrants for 7,187 shares of Class B Common Stock.
(u) Includes warrants for 5,851 shares of Class B Common Stock.
(v) Includes warrants for 962 shares of Class B Common Stock.
(w) Centennial Group has approximately 17.7% of the total voting power of the
    Class B Common Stock on a fully diluted basis. Jeffrey Schutz and David
    Hull, directors of the Company, are each General Partners of Centennial
    Fund IV and Centennial Fund V. In addition, Messrs. Hutcheson, Martin and
    McKenzie are investors in Centennial Entrepreneurs Fund V, L.P., which is
    managed by CHI. Mr. Martin is also an investor in and a director of CHI
    and is a limited partner in Centennial Fund IV and Centennial Fund V. The
    principal business address of Centennial Group is c/o The Centennial
    Funds, 1428 Fifteenth Street, Denver, CO 80202-1318.
(x) Includes warrants for 3,880 shares of Class B Common Stock.
(y) Includes warrants for 120 shares of Class B Common Stock.
(z) Nassau Group has approximately 9.1% of the total voting power of the Class
    B Common Stock on a fully diluted basis. Randall Hack, a director of the
    Company, is a member of Nassau Capital L.L.C., an affiliate of Nassau
    Group. The principal business address of Nassau Capital Partners II, L.P.
    is 22 Chambers Street, Princeton, NJ 08542.
(aa) Includes warrants for 9,938 shares of Class B Common Stock.
(bb) Includes warrants for 62 shares of Class B Common Stock.
(cc) The principal business address of Fay Richwhite is Level 27, 151 Queen
     Street, Auckland, New Zealand.
(dd) Includes warrants for 10,000 shares of Class B Common Stock.
 
                                      100
<PAGE>
 
                   DESCRIPTION OF THE SENIOR CREDIT FACILITY
 
  Two wholly owned subsidiaries of CCIC, CTC and CTC(PR) (collectively, the
"Borrowers"), have entered into the Senior Credit Facility with a group of
banks and other financial institutions led by KeyBank National Association
("KeyBank") and PNC Bank, National Association, as arrangers and agents. The
following summary of certain provisions of the Senior Credit Facility does not
purport to be complete and is subject to, and is qualified in its entirety by
reference to, the provisions of the Senior Credit Facility.
 
  The Senior Credit Facility provides for revolving credit loans in an
aggregate principal amount not to exceed $100.0 million, for working capital
needs, acquisitions and general corporate purposes. The Senior Credit Facility
includes a $5.0 million sublimit available for the issuance of letters of
credit. As of January 5, 1998, the Borrowers had unused borrowing availability
under the Senior Credit Facility of approximately $85.3 million.
 
  The loan commitment under the Senior Credit Facility reduces by $5.0 million
commencing March 31, 2001 and by $5.0 million each calendar quarter thereafter
until December 31, 2004, when the Senior Credit Facility matures. In addition,
the Senior Credit Facility provides for mandatory reduction of the loan
commitment and mandatory prepayment with the (i) net proceeds of certain asset
sales, (ii) net proceeds of certain required capital contributions to CTC by
CCIC relating to the proceeds from the sale of equity, convertible or debt
securities, subject to certain exceptions, (iii) net proceeds of any unused
insurance proceeds and (iv) a percentage of the excess cash flow of the
Borrowers, commencing with the calendar year ending December 31, 2000.
 
  The Borrowers' obligations under the Senior Credit Facility are secured by
substantially all the assets of CCIC's subsidiaries. The Borrowers'
obligations under the Senior Credit Facility are also guaranteed by each
direct and indirect majority owned domestic subsidiary of CCIC and secured by
substantially all the assets of each direct and indirect majority owned
domestic subsidiary of CCIC. In addition, the Senior Credit Facility is
guaranteed on a limited recourse basis by CCIC, limited in recourse to the
pledged capital stock of CTC(PR) and CCIC's domestic subsidiaries. The capital
stock of CTSH will not be pledged to secure the Senior Credit Facility.
 
  The loans under the Senior Credit Facility will bear interest, at the
Borrowers' option, at either (A) a "base rate" equal to the KeyBank's prime
lending rate plus an applicable spread ranging from 0% to 1.5% (determined
based on a leverage ratio) or (B) a "LIBOR rate" plus an applicable spread
ranging from 1.0% to 3.25% (determined based on a leverage ratio). Following
the occurrence and during the continuance of an event of default under the
Senior Credit Facility, the loans will bear interest at the "base rate" plus
3.5%.
 
  The Senior Credit Facility contains a number of covenants that, among other
things, restrict the ability of the Borrowers and their respective
subsidiaries to dispose of assets, incur additional indebtedness, incur
guaranty obligations, repay subordinated indebtedness except in accordance
with the subordination provisions, pay dividends or make capital
distributions, create liens on assets, enter into leases, make investments,
make acquisitions, engage in mergers or consolidations, make capital
expenditures, engage in certain transactions with subsidiaries and affiliates
and otherwise restrict corporate activities. In addition, the Senior Credit
Facility will require compliance with certain financial covenants, including
requiring the Borrowers and their respective subsidiaries to maintain a
maximum ratio of indebtedness to operating cash flow, a minimum ratio of
operating cash flow to fixed charges, a minimum ratio of operating cash flow
to projected debt service and a minimum ratio of operating cash flow to
interest expense. CCIC does not expect that such covenants will materially
impact the ability of the Borrowers and their respective subsidiaries to
operate their respective businesses.
 
  Pursuant to the terms of the Senior Credit Facility, CTC is entitled to pay
dividends or make distributions to CCIC in order to permit CCIC to pay its
out-of-pocket costs for corporate development and overhead and to pay cash
interest on certain indebtedness of CCIC (including the Notes); provided that
the amount of such dividends or distributions does not exceed (i) $6.0 million
in any year ending on or prior to the fifth anniversary of the October
Refinancing (such period being the period prior to the date that the Notes
begin to accrue cash interest) and (ii) $33.0 million in any year thereafter.
The Senior Credit Facility also allows CTC to pay
 
                                      101
<PAGE>
 
dividends or distribute cash to CCIC to the extent required to pay taxes
allocable to the Borrowers and their respective subsidiaries. All of the
above-mentioned dividends or distributions, however, including dividends or
distributions that are intended to pay interest on the Notes, may not be made
by CTC so long as any default or event of default exists under the Senior
Credit Facility.
 
  The Senior Credit Facility contains customary events of default, including
the failure to pay principal when due or any interest or other amount that
becomes due within two days after the due date thereof, any representation or
warranty being made by the Borrowers that is incorrect in any material respect
on or as of the date made, a default in the performance of any negative
covenants or a default in the performance of certain other covenants or
agreements for a period of thirty days, default in certain other indebtedness,
certain insolvency events and certain change of control events. In addition, a
default under the Indenture will result in a default under the Senior Credit
Facility.
 
                                      102
<PAGE>
 
                           DESCRIPTION OF THE NOTES
 
GENERAL
 
  The Old Notes were issued and the New Notes will be issued pursuant to an
Indenture (the "Indenture") dated as of November 25, 1997 between the Company
and United States Trust Company of New York, as trustee (the "Trustee"), a
copy of which has been filed as an exhibit to the Registration Statement of
which this Prospectus forms a part. The terms of the New Notes will be
identical in all material respects with the terms of the Old Notes, except
that the New Notes have been registered under the Securities Act and are
issued free of any covenant regarding registration, including the payment of
additional interest upon failure to file or have declared effective an
exchange offer registration statement or to consummate the Exchange Offer by
certain dates. The New Notes and the Old Notes are deemed the same series of
Notes under the Indenture and are entitled to the benefits thereof.
Accordingly, unless specifically stated to contrary, the following description
applies equally to the Old Notes and the New Notes. The following is a summary
of certain provisions of the Indenture and the Notes, does not purport to be
complete and is subject to, and is qualified in its entirety by reference to,
all the provisions of the Indenture (including the definitions of certain
terms therein and those terms made a part thereof by the Trust Indenture Act
of 1939, as amended (the "Trust Indenture Act")) and the Notes. Capitalized
terms used in the following description and not otherwise defined therein
shall have the meanings assigned to them in the Indenture. Copies of the
Indenture and Registration Rights Agreement are available as set forth below
under "--Additional Information." The definitions of certain terms used in the
following summary are set forth below under "--Certain Definitions." For
purposes of this summary, the term "Company" refers only to Crown Castle
International Corp. and not to any of its Subsidiaries.
 
  The Notes represent general unsecured obligations of the Company and rank
pari passu in right of payment with all future unsecured senior Indebtedness
of the Company. However, the operations of the Company are conducted through
its Subsidiaries and, therefore, the Company is dependent upon the cash flow
of its Subsidiaries to meet its obligations, including its obligations under
the Notes. The Company's Subsidiaries will not be guarantors of the Notes and
the Notes will be effectively subordinated to all Indebtedness (including all
borrowings under the Senior Credit Facility) and other liabilities and
commitments (including trade payables and lease obligations) of the Company's
Subsidiaries. Any right of the Company to receive assets of any of its
Subsidiaries upon the latter's liquidation or reorganization (and the
consequent right of the Holders of the Notes to participate in those assets)
will be effectively subordinated to the claims of that Subsidiary's creditors,
except to the extent that the Company is itself recognized as a creditor of
such Subsidiary, in which case the claims of the Company would still be
subordinate to any security in the assets of such Subsidiary and any
indebtedness of such Subsidiary senior to that held by the Company. As of
January 5, 1998, the Company's Subsidiaries had $5.0 million of Indebtedness
outstanding, and had approximately $85.3 million of unused borrowing
availability under the Senior Credit Facility. The provisions of the Senior
Credit Facility contain substantial restrictions on the ability of such
Subsidiaries to dividend or distribute cash flow or assets to the Company. See
"Risk Factors--Holding Company Structure; Restrictions on Access to Cash Flow
of Subsidiaries" and "Description of the Senior Credit Facility."
 
  As of the date of the Indenture, all of the Company's Subsidiaries will be
Restricted Subsidiaries. However, under certain circumstances, the Company
will be able to designate current or future Subsidiaries as Unrestricted
Subsidiaries. Unrestricted Subsidiaries will not be subject to many of the
restrictive covenants set forth in the Indenture. CTSH, the Company's U.K.
affiliate, will not be a Subsidiary of the Company as of the date of the
Indenture and will not, therefore, be subject to the provisions of the
Indenture. See "Risk Factors--Relationship with Minority Owned Affiliate;
Potential Conflicts of Interests."
 
PRINCIPAL, MATURITY AND INTEREST
 
  The Notes are limited in aggregate principal amount at maturity to $251.0
million and will mature on November 15, 2007. The Old Notes were offered at a
substantial discount from their principal amount at maturity. See "Certain
United States Federal Income Tax Considerations--U.S. Holders--Interest and
Original Issue Discount." Until November 15, 2002, no interest (other than
Liquidated Damages, if any) will accrue, but the Accreted Value will accrete
(representing the amortization of original issue discount) between the date of
 
                                      103
<PAGE>
 
original issuance and November 15, 2002, on a semiannual bond equivalent basis
using a 360-day year comprised of twelve 30-day months such that the Accreted
Value shall be equal to the full principal amount of the Notes on November 15,
2002 (the "Full Accretion Date"). The initial Accreted Value per $1,000 in
principal amount of Notes is $597.65 (representing the original price at which
Old Notes were offered in the Offering of the Old Notes). Beginning on
November 15, 2002, interest on the Notes will accrue at the rate of 10.625%
per annum and will be payable in U.S. dollars semiannually in arrears on May
15 and November 15, commencing on May 15, 2003, to Holders of record on the
immediately preceding May 1 and November 1. Holders of record on such record
dates will become irrevocably entitled to receive accrued interest and
Liquidated Damages, if any, in respect of the interest period during which
such record date occurs as of the close of business on such record date.
Interest on the Notes will accrue from the most recent date to which interest
has been paid or, if no interest has been paid, from the date of original
issuance. Interest will be computed on the basis of a 360-day year comprised
of twelve 30-day months. Principal, premium, if any, and interest and
Liquidated Damages, if any, on the Notes will be payable at the office or
agency of the Company maintained for such purpose within the City and State of
New York or, at the option of the Company, payment of interest and Liquidated
Damages may be made by check mailed to the Holders of the Notes at their
respective addresses set forth in the register of Holders of Notes; provided
that all payments of principal, premium, interest and Liquidated Damages with
respect to Notes the Holders of which have given wire transfer instructions to
the Company will be required to be made by wire transfer of immediately
available funds to the accounts in the United States specified by the Holders
thereof. Until otherwise designated by the Company, the Company's office or
agency in New York will be the office of the Trustee maintained for such
purpose. The Notes will be issued in denominations of $1,000 and integral
multiples thereof.
 
OPTIONAL REDEMPTION
 
  Except as described below, the Notes will not be redeemable at the Company's
option prior to November 15, 2002. Thereafter, the Notes will be subject to
redemption at any time at the option of the Company, in whole or in part, upon
not less than 30 nor more than 60 days' notice, at the redemption prices
(expressed as percentages of principal amount) set forth below plus accrued
and unpaid interest and Liquidated Damages thereon, if any, to the applicable
redemption date (subject to the right of Holders of record on the relevant
record date to receive interest and Liquidated Damages due on the relevant
interest payment date), if redeemed during the twelve-month period beginning
on November 15 of the years indicated below:
 
<TABLE>
<CAPTION>
      YEAR                                                            PERCENTAGE
      ----                                                            ----------
      <S>                                                             <C>
      2002...........................................................  105.313%
      2003...........................................................  103.542
      2004...........................................................  101.771
      2005 and thereafter............................................  100.000
</TABLE>
 
  During the first 36 months after the date of original issuance of the Old
Notes, the Company may on any one or more occasions redeem up to 35% of the
aggregate principal amount at maturity of Notes originally issued at a
redemption price of 110.625% of the Accreted Value thereof on the redemption
date, plus Liquidated Damages thereon, if any, to the redemption date (subject
to the right of Holders of record on the relevant record date to receive
Liquidated Damages, if any, due on the relevant interest payment date), with
the net cash proceeds of one or more Public Equity Offerings and/or Strategic
Equity Investments; provided that at least 65% of the aggregate principal
amount at maturity of Notes originally issued remains outstanding immediately
after the occurrence of such redemption (excluding Notes held by the Company
or any of its Subsidiaries); and provided, further, that such redemption shall
occur within 60 days of the date of the closing of such Public Equity Offering
and/or Strategic Equity Investment.
 
SELECTION AND NOTICE
 
  If less than all of the Notes are to be redeemed at any time, selection of
Notes for redemption will be made by the Trustee in compliance with the
requirements of the principal national securities exchange, if any, on which
the Notes are listed, or, if the Notes are not so listed, on a pro rata basis,
by lot or by such method as the Trustee shall deem fair and appropriate;
provided that no Notes of $1,000 or less shall be redeemed in part. Notices of
 
                                      104
<PAGE>
 
redemption shall be mailed by first class mail at least 30 but not more than
60 days before the redemption date to each Holder of Notes to be redeemed at
its registered address. Notices of redemption may not be conditional. If any
Note is to be redeemed in part only, the notice of redemption that relates to
such Note shall state the portion of the principal amount thereof to be
redeemed. A new Note in principal amount equal to the unredeemed portion
thereof will be issued in the name of the Holder thereof upon cancellation of
the original Note. Notes called for redemption become due on the date fixed
for redemption. On and after the redemption date, interest ceases to accrue on
Notes or portions of them called for redemption.
 
MANDATORY REDEMPTION
 
  The Company is not required to make mandatory redemption or sinking fund
payments with respect to the Notes.
 
REPURCHASE AT THE OPTION OF HOLDERS
 
 Change of Control
 
  Upon the occurrence of a Change of Control, each Holder of Notes will have
the right to require the Company to repurchase all or any part (equal to
$1,000 or an integral multiple thereof) of such Holder's Notes pursuant to the
offer described below (the "Change of Control Offer") at an offer price in
cash equal to 101% of the aggregate principal amount thereof plus accrued and
unpaid interest and Liquidated Damages thereon, if any (subject to the right
of Holders of record on the relevant record date to receive interest and
Liquidated Damages, if any, due on the relevant interest payment date), to the
date of purchase or, in the case of repurchases of Notes prior to the Full
Accretion Date, at a purchase price equal to 101% of the Accreted Value
thereof on the date of repurchase plus Liquidated Damages thereon, if any
(subject to the right of Holders of record on the relevant record date to
receive Liquidated Damages, if any, due on the relevant interest payment
date), to such date of repurchase (the "Change of Control Payment"). Within 30
days following any Change of Control, the Company will mail a notice to each
Holder describing the transaction or transactions that constitute the Change
of Control and offering to repurchase Notes on the date specified in such
notice, which date shall be no earlier than 30 days and no later than 60 days
from the date such notice is mailed (the "Change of Control Payment Date"),
pursuant to the procedures required by the Indenture and described in such
notice.
 
  On the Change of Control Payment Date, the Company will, to the extent
lawful, (1) accept for payment all Notes or portions thereof properly tendered
pursuant to the Change of Control Offer, (2) deposit with the Paying Agent an
amount equal to the Change of Control Payment in respect of all Notes or
portions thereof so tendered and (3) deliver or cause to be delivered to the
Trustee the Notes so accepted together with an Officers' Certificate stating
the aggregate principal amount of Notes or portions thereof being purchased by
the Company. The Paying Agent will promptly mail to each Holder of Notes so
tendered the Change of Control Payment for such Notes, and the Trustee will
promptly authenticate and mail (or cause to be transferred by book entry) to
each Holder a new Note equal in principal amount to any unpurchased portion of
the Notes surrendered, if any; provided that each such new Note will be in a
principal amount of $1,000 or an integral multiple thereof.
 
  The Change of Control provisions described above will be applicable whether
or not any other provisions of the Indenture are applicable. The Company will
comply, to the extent applicable, with the requirements of Section 14(e) of
the Exchange Act and any other securities laws or regulations applicable to
any Change of Control Offer. To the extent that the provisions of any such
securities laws or securities regulations conflict with the provisions of the
covenant described above, the Company will comply with the applicable
securities laws and regulations and will not be deemed to have breached its
obligations under the covenant described above by virtue thereof.
 
  The Change of Control purchase feature is a result of negotiations between
the Company and the Initial Purchasers. Management has no present intention to
engage in a transaction involving a Change of Control, although it is possible
that the Company would decide to do so in the future. Subject to the
limitations discussed below, the Company could, in the future, enter into
certain transactions, including acquisitions, refinancings or other
recapitalizations, that would not constitute a Change of Control under the
Indenture, but that could increase the amount of Indebtedness outstanding at
such time or otherwise affect the Company's capital structure. Restrictions on
the ability of the Company to incur additional Indebtedness are contained in
the covenants
 
                                      105
<PAGE>
 
described under "--Certain Covenants--Incurrence of Indebtedness and Issuance
of Preferred Stock," "--Certain Covenants--Liens" and "--Certain Covenants--
Sale and Leaseback Transactions." Such restrictions can only be waived with
the consent of the Holders of a majority in principal amount of the Notes then
outstanding. Except for the limitations contained in such covenants, however,
the Indenture will not contain any covenants or provisions that may afford
holders of the Notes protection in the event of certain highly leveraged
transactions.
 
  The Senior Credit Facility limits the Company's access to the cash flow of
its Subsidiaries and will, therefore, restrict the Company's ability to
purchase any Notes. The Senior Credit Facility also provides that the
occurrence of certain change of control events with respect to the Company
constitute a default thereunder. In the event that a Change of Control occurs
at a time when the Company's Subsidiaries are prohibited from making
distributions to the Company to purchase Notes, the Company could cause its
Subsidiaries to seek the consent of the lenders under the Senior Credit
Facility to allow such distributions or could attempt to refinance the
borrowings that contain such prohibition. If the Company does not obtain such
a consent or repay such borrowings, the Company will remain prohibited from
purchasing Notes. In such case, the Company's failure to purchase tendered
Notes would constitute an Event of Default under the Indenture which would, in
turn, constitute a default under the Senior Credit Facility. Future
indebtedness of the Company and its Subsidiaries may contain prohibitions on
the occurrence of certain events that would constitute a Change of Control or
require such indebtedness to be repurchased upon a Change of Control.
Moreover, the exercise by the holders of their right to require the Company to
repurchase the Notes could cause a default under such indebtedness, even if
the Change of Control itself does not, due to the financial effect of such
repurchase on the Company. Finally, the Company's ability to pay cash to the
Holders of Notes following the occurrence of a Change of Control may be
limited by the Company's then existing financial resources, including its
ability to access the cash flow of its Subsidiaries. See "Risk Factors--
Repurchase of the Notes Upon a Change of Control" and "Risk Factors--Holding
Company Structure; Restrictions on Access to Cash Flow of Subsidiaries." There
can be no assurance that sufficient funds will be available when necessary to
make any required repurchases.
 
  The Company will not be required to make a Change of Control Offer upon a
Change of Control if a third party makes the Change of Control Offer in the
manner, at the times and otherwise in compliance with the requirements set
forth in the Indenture applicable to a Change of Control Offer made by the
Company and purchases all Notes validly tendered and not withdrawn under such
Change of Control Offer. The provisions under the Indenture relative to the
Company's obligation to make an offer to repurchase the Notes as a result of a
Change of Control may be waived or modified with the written consent of the
Holders of a majority in principal amount of the Notes then outstanding.
 
  The definition of Change of Control includes a phrase relating to the sale,
lease, transfer, conveyance or other disposition of "all or substantially all"
of the assets of the Company and its Restricted Subsidiaries taken as a whole.
Although there is a developing body of case law interpreting the phrase
"substantially all," there is no precise established definition of the phrase
under applicable law. Accordingly, the ability of a Holder of Notes to require
the Company to repurchase such Notes as a result of a sale, lease, transfer,
conveyance or other disposition of less than all of the assets of the Company
and its Subsidiaries taken as a whole to another Person or group may be
uncertain.
 
 Asset Sales
 
  The Indenture provides that the Company will not, and will not permit any of
its Restricted Subsidiaries to, consummate an Asset Sale unless (i) the
Company (or the Restricted Subsidiary, as the case may be) receives
consideration at the time of such Asset Sale at least equal to the fair market
value (evidenced by a resolution of the Board of Directors set forth in an
Officers' Certificate delivered to the Trustee) of the assets or Equity
Interests issued or sold or otherwise disposed of and (ii) except in the case
of a Tower Asset Exchange, at least 75% of the consideration therefor received
by the Company or such Restricted Subsidiary is in the form of cash or Cash
Equivalents; provided that the amount of (x) any liabilities (as shown on the
Company's or such Restricted Subsidiary's most recent balance sheet), of the
Company or any Restricted Subsidiary (other than contingent liabilities and
liabilities that are by their terms subordinated to the Notes or any guarantee
thereof)
 
                                      106
<PAGE>
 
that are assumed by the transferee of any such assets pursuant to a customary
novation agreement that releases the Company or such Restricted Subsidiary
from further liability and (y) any securities, notes or other obligations
received by the Company or any such Restricted Subsidiary from such transferee
that are converted by the Company or such Restricted Subsidiary into cash
within 20 days of the applicable Asset Sale (to the extent of the cash
received), shall be deemed to be cash for purposes of this provision.
 
  Within 360 days after the receipt of any Net Proceeds from an Asset Sale,
the Company or the applicable Restricted Subsidiary may apply such Net
Proceeds to: (a) reduce Indebtedness under a Credit Facility; (b) reduce other
Indebtedness of any of the Company's Restricted Subsidiaries; (c) the
acquisition of all or substantially all the assets of a Permitted Business;
(d) the acquisition of Voting Stock of a Permitted Business from a Person that
is not a Subsidiary of the Company; provided, that, after giving effect
thereto, the Company or its Restricted Subsidiary owns a majority of such
Voting Stock; or (e) the making of a capital expenditure or the acquisition of
other long-term assets that are used or useful in a Permitted Business.
Pending the final application of any such Net Proceeds, the Company may
temporarily reduce revolving credit borrowings or otherwise invest such Net
Proceeds in any manner that is not prohibited by the Indenture. Any Net
Proceeds from Asset Sales that are not applied or invested as provided in the
first sentence of this paragraph will be deemed to constitute "Excess
Proceeds." When the aggregate amount of Excess Proceeds exceeds $5.0 million,
the Company will be required to make an offer to all Holders of Notes and all
holders of other senior Indebtedness of the Company containing provisions
similar to those set forth in the Indenture with respect to offers to purchase
or redeem with the proceeds of sales of assets (an "Asset Sale Offer") to
purchase the maximum principal amount (or accreted value, as applicable) of
Notes and such other senior Indebtedness of the Company that may be purchased
out of the Excess Proceeds, at an offer price in cash in an amount equal to
100% of the principal amount (or accreted value, as applicable) thereof plus
accrued and unpaid interest and Liquidated Damages thereon, if any, to the
date of purchase (subject to the right of Holders of record on the relevant
record date to receive interest and Liquidated Damages, if any, due on the
relevant interest payment date), in accordance with the procedures set forth
in the Indenture and such other senior Indebtedness of the Company. To the
extent that any Excess Proceeds remain after consummation of an Asset Sale
Offer, the Company may use such Excess Proceeds for any purpose not otherwise
prohibited by the Indenture. If the aggregate principal amount of Notes and
such other senior Indebtedness of the Company tendered into such Asset Sale
Offer surrendered by Holders thereof exceeds the amount of Excess Proceeds,
the Trustee shall select the Notes and such other senior Indebtedness to be
purchased on a pro rata basis. Upon completion of such offer to purchase, the
amount of Excess Proceeds shall be reset at zero.
 
CERTAIN COVENANTS
 
 Restricted Payments
 
  The Indenture provides that the Company will not, and will not permit any of
its Restricted Subsidiaries to, directly or indirectly: (i) declare or pay any
dividend or make any other payment or distribution on account of the Company's
or any of its Restricted Subsidiaries' Equity Interests (including, without
limitation, any payment in connection with any merger or consolidation
involving the Company or any of its Restricted Subsidiaries) or to the direct
or indirect holders of the Company's or any of its Restricted Subsidiaries'
Equity Interests in their capacity as such (other than dividends or
distributions payable in Equity Interests (other than Disqualified Stock) of
the Company or to the Company or a Restricted Subsidiary of the Company); (ii)
purchase, redeem or otherwise acquire or retire for value (including without
limitation, in connection with any merger or consolidation involving the
Company) any Equity Interests of the Company or any direct or indirect parent
of the Company (other than any such Equity Interests owned by the Company or
any Restricted Subsidiary of the Company); (iii) make any payment on or with
respect to, or purchase, redeem, defease or otherwise acquire or retire for
value any Indebtedness that is subordinated to the Notes, except a payment of
interest or principal at Stated Maturity; or (iv) make any Restricted
Investment (all such payments and other actions set forth in clauses (i)
through (iv) above being collectively referred to as "Restricted Payments"),
unless, at the time of and after giving effect to such Restricted Payment:
 
    (a) no Default shall have occurred and be continuing or would occur as a
  consequence thereof; and
 
                                      107
<PAGE>
 
    (b) the Company would have been permitted to incur at least $1.00 of
  additional indebtedness pursuant to the Debt to Adjusted Consolidated Cash
  Flow Ratio test set forth in the first paragraph of the covenant described
  below under the caption "--Incurrence of Indebtedness and Issuance of
  Preferred Stock;" and
 
    (c) such Restricted Payment, together with the aggregate amount of all
  other Restricted Payments made by the Company and its Restricted
  Subsidiaries after the date of the Indenture (excluding Restricted Payments
  permitted by clauses (ii), (iii) and (iv) of the next succeeding
  paragraph), is less than the sum, without duplication, of (i) 50% of the
  Consolidated Net Income of the Company for the period (taken as one
  accounting period) from the beginning of the first fiscal quarter
  commencing after the date of the Indenture to the end of the Company's most
  recently ended fiscal quarter for which internal financial statements are
  available at the time of such Restricted Payment (or, if such Consolidated
  Net Income for such period is a deficit, less 100% of such deficit), plus
  (ii) 100% of the aggregate net cash proceeds received by the Company since
  the date of the Indenture as a contribution to its common equity capital or
  from the issue or sale of Equity Interests of the Company (other than
  Disqualified Stock and except to the extent such net cash proceeds are used
  to incur new Indebtedness outstanding pursuant to clause (x) of the second
  paragraph of the covenant described below under the caption "--Incurrence
  of Indebtedness and Issuance of Preferred Stock") or from the issue or sale
  of Disqualified Stock or debt securities of the Company that have been
  converted into such Equity Interests (other than Equity Interests (or
  Disqualified Stock or convertible debt securities) sold to a Subsidiary of
  the Company and other than Disqualified Stock or convertible debt
  securities that have been converted into Disqualified Stock), plus (iii) to
  the extent that any Restricted Investment that was made after the date of
  the Indenture is sold for cash or otherwise liquidated or repaid for cash,
  the lesser of (A) the cash return of capital with respect to such
  Restricted Investment (less the cost of disposition, if any) and (B) the
  initial amount of such Restricted Investment, plus (iv) to the extent that
  any Unrestricted Subsidiary of the Company is designated as a Restricted
  Subsidiary after the date of the Indenture, the lesser of (A) the fair
  market value of the Company's Investment in such Subsidiary as of the date
  of such designation, or (B) the sum of (x) the fair market value of the
  Company's Investment in such Subsidiary as of the date on which such
  Subsidiary was originally designated as an Unrestricted Subsidiary and (y)
  the amount of any Investments made in such Subsidiary subsequent to such
  designation (and treated as a Restricted Payment) by the Company or any
  Restricted Subsidiary; provided that in the event the Unrestricted
  Subsidiary designated as a Restricted Subsidiary is CTSH, the references in
  clause (A) and (B) of this clause (iv) to fair market value of the
  Company's Investment in such Subsidiary shall mean the amount by which the
  fair market value of such Investment exceeds 34.3% of the fair market value
  of CTSH as a whole, plus (v) 50% of any dividends received by the Company
  or a Restricted Subsidiary after the date of the Indenture from an
  Unrestricted Subsidiary of the Company, to the extent that such dividends
  were not otherwise included in Consolidated Net Income of the Company for
  such period.
 
  The foregoing provisions will not prohibit (i) the payment of any dividend
within 60 days after the date of declaration thereof, if at said date of
declaration such payment would have complied with the provisions of the
Indenture; (ii) the making of any Investment or the redemption, repurchase,
retirement, defeasance or other acquisition of any subordinated Indebtedness
or Equity Interests of the Company in exchange for, or out of the net cash
proceeds of the substantially concurrent sale (other than to a Subsidiary of
the Company) of, any Equity Interests of the Company (other than any
Disqualified Stock; provided that such net cash proceeds are not used to incur
new Indebtedness pursuant to clause (x) of the second paragraph of the
covenant described below under the caption "--Incurrence of Indebtedness and
Issuance of Preferred Stock"); and provided further that, in each such case,
the amount of any such net cash proceeds that are so utilized shall be
excluded from clause (c) (ii) of the preceding paragraph; (iii) the
defeasance, redemption, repurchase or other acquisition of subordinated
Indebtedness with the net cash proceeds from an incurrence of Permitted
Refinancing Indebtedness; or (iv) the designation of CTSH as an Unrestricted
Subsidiary immediately following the Roll-Up.
 
  The Board of Directors may designate any Restricted Subsidiary to be an
Unrestricted Subsidiary if such designation would not cause a Default;
provided that in no event shall the businesses operated by the Company's
Restricted Subsidiaries as of the date of the Indenture be transferred to or
held by an Unrestricted Subsidiary. For purposes of making such determination,
all outstanding Investments by the Company and its Restricted
 
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Subsidiaries (except to the extent repaid in cash) in the Subsidiary so
designated will be deemed to be Restricted Payments at the time of such
designation and will reduce the amount available for Restricted Payments under
the first paragraph of this covenant. All such outstanding Investments will be
deemed to constitute Investments in an amount equal to the fair market value
of such Investments at the time of such designation. Such designation will
only be permitted if such Restricted Payment would be permitted at such time
and if such Restricted Subsidiary otherwise meets the definition of an
Unrestricted Subsidiary. The Board of Directors may designate any Unrestricted
Subsidiary to be a Restricted Subsidiary if such designation would not cause a
Default.
 
  The amount of all Restricted Payments (other than cash) shall be the fair
market value on the date of the Restricted Payment of the asset(s) or
securities proposed to be transferred or issued by the Company or the
applicable Restricted Subsidiary, as the case may be, pursuant to the
Restricted Payment. The fair market value of any property, assets or
Investments required by this covenant to be determined shall be determined by
the Board of Directors whose resolution with respect thereto shall be
delivered to the Trustee.
 
 Incurrence of Indebtedness and Issuance of Preferred Stock
 
  The Indenture provides that the Company will not, and will not permit any of
its Restricted Subsidiaries to, directly, or indirectly, create, incur, issue,
assume, guarantee or otherwise become directly or indirectly liable,
contingently or otherwise, with respect to (collectively, "incur") any
Indebtedness (including Acquired Debt) and that the Company will not issue any
Disqualified Stock and will not permit any of its Restricted Subsidiaries to
issue any shares of preferred stock; provided, however, that the Company may
incur Indebtedness (including Acquired Debt) or issue shares of Disqualified
Stock and the Company's Restricted Subsidiaries may incur Eligible
Indebtedness if, in each case, (i) no Default shall have occurred and be
continuing or would occur as a consequence thereof and (ii) the Company's Debt
to Adjusted Consolidated Cash Flow Ratio at the time of incurrence of such
Indebtedness or the issuance of such Disqualified Stock, after giving pro
forma effect to such incurrence or issuance as of such date and to the use of
proceeds therefrom as if the same had occurred at the beginning of the most
recently ended four full fiscal quarter period of the Company for which
internal financial statements are available, would have been no greater than
6.5 to 1.
 
  The provisions of the first paragraph of this covenant will not apply to the
incurrence of any of the following items of Indebtedness (collectively,
"Permitted Debt") if no Default shall have occurred and be continuing or would
occur as a consequence thereof:
 
    (i) the incurrence by the Company or any of its Restricted Subsidiaries
  of Indebtedness (including Indebtedness under Credit Facilities) in an
  aggregate principal amount (with letters of credit being deemed to have a
  principal amount equal to the maximum potential liability of the Company
  and its Restricted Subsidiaries thereunder) at any one time outstanding not
  to exceed the greater of (x) $100.0 million less the aggregate amount of
  all Net Proceeds of Asset Sales applied to repay Indebtedness under a
  Credit Facility pursuant to the covenant described above under the caption
  "--Repurchase at the Option of Holders--Asset Sales" and (y) 70% of the
  Eligible Receivables that are outstanding as of such date of incurrence;
 
    (ii) the incurrence by the Company and its Restricted Subsidiaries of the
  Existing Indebtedness;
 
    (iii) the incurrence by the Company of Indebtedness represented by the
  Notes and the New Notes;
 
    (iv) the incurrence by the Company or any of its Restricted Subsidiaries
  of Indebtedness represented by Capital Lease Obligations, mortgage
  financings or purchase money obligations, in each case incurred for the
  purpose of financing all or any part of the purchase price or cost of
  construction or improvement of property, plant or equipment used in the
  business of the Company or such Restricted Subsidiary, in an aggregate
  principal amount, including all Permitted Refinancing Indebtedness incurred
  to refund, refinance or replace any other Indebtedness incurred pursuant to
  this clause (iv), not to exceed $5.0 million at any one time outstanding;
 
    (v) the incurrence by the Company or any of its Restricted Subsidiaries
  of Permitted Refinancing Indebtedness in exchange for, or the net proceeds
  of which are used to extend, refinance, renew, replace, defease or refund
  Indebtedness (other than intercompany Indebtedness) that was permitted by
  the Indenture to be incurred under the first paragraph hereof or clauses
  (ii) or (iii) or this clause (v) of this paragraph;
 
    (vi) the incurrence by the Company or any of its Restricted Subsidiaries
  of intercompany Indebtedness between or among the Company and any of its
  Restricted Subsidiaries; provided, however, that (i) if the
 
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<PAGE>
 
  Company is the obligor on such Indebtedness, such Indebtedness is expressly
  subordinated to the prior payment in full in cash of all Obligations with
  respect to the Notes and (ii)(A) any subsequent issuance or transfer of
  Equity Interests that results in any such Indebtedness being held by a
  Person other than the Company or a Restricted Subsidiary and (B) any sale
  or other transfer of any such Indebtedness to a Person that is not either
  the Company or a Restricted Subsidiary shall be deemed, in each case, to
  constitute an incurrence of such Indebtedness by the Company or such
  Restricted Subsidiary, as the case may be;
 
    (vii) the incurrence by the Company or any of its Restricted Subsidiaries
  of Hedging Obligations that are incurred for the purpose of fixing or
  hedging interest rate risk with respect to any floating rate Indebtedness
  that is permitted by the terms of the Indenture to be outstanding or
  currency exchange risk;
 
    (viii) the guarantee by the Company or any of its Restricted Subsidiaries
  of Indebtedness of the Company or a Restricted Subsidiary of the Company
  that was permitted to be incurred by another provision of the Indenture;
 
    (ix) the incurrence by the Company or any of its Restricted Subsidiaries
  of Acquired Debt in connection with the acquisition of assets or a new
  Subsidiary and the incurrence by the Company's Restricted Subsidiaries of
  Indebtedness as a result of the designation of an Unrestricted Subsidiary
  as a Restricted Subsidiary; provided that, in the case of any such
  incurrence of Acquired Debt, such Acquired Debt was incurred by the prior
  owner of such assets or such Restricted Subsidiary prior to such
  acquisition by the Company or one of its Restricted Subsidiaries and was
  not incurred in connection with, or in contemplation of, such acquisition
  by the Company or one of its Restricted Subsidiaries; and provided further
  that, in the case of any incurrence pursuant to this clause (viii), the
  Company would have been permitted to incur at least $1.00 of additional
  indebtedness (other than Permitted Debt) immediately after such incurrence
  pursuant to the Debt to Adjusted Consolidated Cash Flow Ratio test set
  forth in the first paragraph of this covenant, calculated as if such
  incurrence had occurred as of the actual date of incurrence and the related
  acquisition or designation (as applicable) had occurred at the beginning of
  the most recently ended four full fiscal quarter period of the Company for
  which internal financial statements are available;
 
    (x) the incurrence by the Company of Indebtedness not to exceed, at any
  one time outstanding, 2.0 times the aggregate net cash proceeds from the
  issuance and sale, other than to a Subsidiary, of Equity Interests (other
  than Disqualified Stock) of the Company since the date of the Indenture
  (less the amount of such proceeds used to make Restricted Payments as
  provided in clause (c)(ii) of the first paragraph or clause (ii) of the
  second paragraph of the covenant described above under the caption "--
  Restricted Payments"); provided that such Indebtedness does not mature
  prior to the Stated Maturity of the Notes and the Weighted Average Life to
  Maturity of such Indebtedness is longer than that of the Notes; and
 
    (xi) the incurrence by the Company or any of its Restricted Subsidiaries
  of additional Indebtedness in an aggregate principal amount (or accreted
  value, as applicable) at any time outstanding, not to exceed $5.0 million.
 
  The Indenture also provides that (i) the Company will not incur any
Indebtedness that is contractually subordinated in right of payment to any
other Indebtedness of the Company unless such Indebtedness is also
contractually subordinated in right of payment to the Notes on substantially
identical terms; provided, however, that no Indebtedness of the Company shall
be deemed to be contractually subordinated in right of payment to any other
Indebtedness of the Company solely by virtue of being unsecured and (ii) the
Company will not permit any of its Unrestricted Subsidiaries to incur any
Indebtedness other than Non-Recourse Debt.
 
  For purposes of determining compliance with this covenant, in the event that
an item of Indebtedness meets the criteria of more than one of the categories
of Permitted Debt described in clauses (i) through (xi) above or is entitled
to be incurred pursuant to the first paragraph of this covenant, the Company
shall, in its sole discretion, classify such item of Indebtedness in any
manner that complies with this covenant. Accrual of interest, accretion or
amortization of original issue discount and the payment of interest in the
form of additional Indebtedness will not be deemed to be an incurrence of
Indebtedness for purposes of this covenant.
 
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<PAGE>
 
 Liens
 
  The Indenture provides that the Company will not, and will not permit any of
its Restricted Subsidiaries to, directly or indirectly, create, incur, assume
or suffer to exist any Lien securing Indebtedness or trade payables on any
asset now owned or hereafter acquired, or any income or profits therefrom or
assign or convey any right to receive income therefrom, except Permitted
Liens.
 
 Dividend and Other Payment Restrictions Affecting Subsidiaries
 
  The Indenture provides that the Company will not, and will not permit any of
its Restricted Subsidiaries to, directly or indirectly, create or otherwise
cause or suffer to exist or become effective any encumbrance or restriction on
the ability of any Restricted Subsidiary to (i)(a) pay dividends or make any
other distributions to the Company or any of its Restricted Subsidiaries (1)
on its Capital Stock or (2) with respect to any other interest or
participation in, or measured by, its profits, or (b) pay any indebtedness
owed to the Company or any of its Restricted Subsidiaries, (ii) make loans or
advances to the Company or any of its Restricted Subsidiaries or (iii)
transfer any of its properties or assets to the Company or any of its
Restricted Subsidiaries. However, the foregoing restrictions will not apply to
encumbrances or restrictions existing under or by reason of (a) Existing
Indebtedness as in effect on the date of the Indenture or Indebtedness under
the Senior Credit Facility, and any amendments, modifications, restatements,
renewals, increases, supplements, refundings, replacements or refinancings
thereof; provided that such amendments, modifications, restatements, renewals,
increases, supplements, refundings, replacements or refinancings are no more
restrictive, taken as a whole, with respect to such dividend and other payment
restrictions than those contained in the applicable series of Existing
Indebtedness as in effect on the date of the Indenture or in the Senior Credit
Facility, (b) encumbrances and restrictions applicable to CTSH and its
Subsidiaries, as the same are in effect as of the date on which CTSH becomes a
Restricted Subsidiary, and as the same may be amended, modified, restated,
renewed, increased, supplemented, refunded, replaced or refinanced; provided
that such amendments, modifications, restatements, renewals, increases,
supplements, refundings, replacement or refinancings are no more restrictive,
taken as a whole, with respect to such dividend and other payment restrictions
than those contained in the applicable series of Indebtedness of CTSH as in
effect on the date on which CTSH becomes a Restricted Subsidiary, (c) the
Indenture and the Notes, (d) applicable law, (e) any instrument governing
Indebtedness or Capital Stock of a Person acquired by the Company or any of
its Restricted Subsidiaries as in effect at the time of such acquisition
(except to the extent such Indebtedness was incurred in connection with or in
contemplation of such acquisition), which encumbrance or restriction is not
applicable to any Person, or the properties or assets of any Person, other
than the Person, or the property or assets of the Person, so acquired,
provided that, in the case of Indebtedness, such Indebtedness was permitted by
the terms of the Indenture to be incurred, (f) by reason of customary non-
assignment provisions in leases or licenses entered into in the ordinary
course of business, (g) purchase money obligations for property acquired in
the ordinary course of business that impose restrictions of the nature
described in clause (iii) above on the property so acquired, (h) the
provisions of agreements governing Indebtedness incurred pursuant to clause
(iv) of the second paragraph of the covenant described above under the caption
"--Incurrence of Indebtedness and Issuance of Preferred Stock," (i) any
agreement for the sale of a Restricted Subsidiary that restricts that
Restricted Subsidiary pending its sale, (j) Permitted Refinancing
Indebtedness, provided that the restrictions contained in the agreements
governing such Permitted Refinancing Indebtedness are no more restrictive,
taken as a whole, than those contained in the agreements governing the
Indebtedness being refinanced, (k) Liens permitted to be incurred pursuant to
the provisions of the covenant described under the caption "--Liens" that
limit the right of the debtor to transfer the assets subject to such Liens,
(l) provisions with respect to the disposition or distribution of assets or
property in joint venture agreements and other similar agreements and (m)
restrictions on cash or other deposits or net worth imposed by customers under
contracts entered into in the ordinary course of business.
 
 Merger, Consolidation or Sale of Assets
 
  The Indenture provides that the Company may not consolidate or merge with or
into (whether or not the Company is the surviving corporation), or sell,
assign, transfer, lease, convey or otherwise dispose of all or substantially
all of its properties or assets in one or more related transactions, to
another corporation, Person or
 
                                      111
<PAGE>
 
entity unless (i) the Company is the surviving corporation or the entity or
the Person formed by or surviving any such consolidation or merger (if other
than the Company) or to which such sale, assignment, transfer, lease,
conveyance or other disposition shall have been made is a corporation
organized or existing under the laws of the United States, any state thereof
or the District of Columbia; (ii) the entity or Person formed by or surviving
any such consolidation or merger (if other than the Company) or the entity or
Person to which such sale, assignment, transfer, lease, conveyance or other
disposition shall have been made assumes all the obligations of the Company
under the Notes and the Indenture pursuant to a supplemental indenture in a
form reasonably satisfactory to the Trustee; (iii) immediately after such
transaction no Default exists; and (iv) except in the case of a merger of the
Company with or into a Wholly Owned Restricted Subsidiary of the Company and
except in the case of a merger entered into solely for the purpose of
reincorporating the Company in another jurisdiction, the Company or the entity
or Person formed by or surviving any such consolidation or merger (if other
than the Company), or to which such sale, assignment, transfer, lease,
conveyance or other disposition shall have been made will, at the time of such
transaction and after giving pro forma effect thereto as if such transaction
had occurred at the beginning of the applicable four-quarter period, be
permitted to incur at least $1.00 of additional Indebtedness pursuant to the
Debt to Adjusted Consolidated Cash Flow Ratio test set forth in the first
paragraph of the covenant described above under the caption "--Incurrence of
Indebtedness and Issuance of Preferred Stock."
 
 Transactions with Affiliates
 
  The Indenture provides that the Company will not, and will not permit any of
its Restricted Subsidiaries to, make any payment to, or sell, lease, transfer
or otherwise dispose of any of its properties or assets to, or purchase any
property or assets from, or enter into or make or amend any transaction,
contract, agreement, understanding, loan, advance or guarantee with, or for
the benefit of, any Affiliate (each of the foregoing, an "Affiliate
Transaction"), unless (i) such Affiliate Transaction is on terms that are no
less favorable to the Company or the relevant Restricted Subsidiary than those
that would have been obtained in a comparable transaction by the Company or
such Restricted Subsidiary with an unrelated Person and (ii) the Company
delivers to the Trustee (a) with respect to any Affiliate Transaction or
series of related Affiliate Transactions involving aggregate consideration in
excess of $1.0 million, a resolution of the Board of Directors set forth in an
Officers' Certificate certifying that such Affiliate Transaction complies with
clause (i) above and that such Affiliate Transaction has been approved by a
majority of the disinterested members of the Board of Directors and (b) with
respect to any Affiliate Transaction or series of related Affiliate
Transactions involving aggregate consideration in excess of $5.0 million, an
opinion as to the fairness to the Holders of such Affiliate Transaction from a
financial point of view issued by an accounting, appraisal or investment
banking firm of national standing. Notwithstanding the foregoing, the
following items shall not be deemed to be Affiliate Transactions: (i) any
employment arrangements with any executive officer of the Company or a
Restricted Subsidiary that is entered into by the Company or any of its
Restricted Subsidiaries in the ordinary course of business and consistent with
compensation arrangements of similarly situated executive officers at
comparable companies engaged in Permitted Businesses, (ii) transactions
between or among the Company and/or its Restricted Subsidiaries, (iii) payment
of directors fees in an aggregate annual amount not to exceed $25,000 per
Person, (iv) Restricted Payments that are permitted by the provisions of the
Indenture described above under the caption "--Restricted Payments," (v) the
issuance or sale of Equity Interests (other than Disqualified Stock) of the
Company, and (vi) transactions pursuant to the provisions of the Services
Agreement, the CTSH Shareholders' Agreement and the Stockholders Agreement as
the same are in effect on the date of the Indenture.
 
 Sale and Leaseback Transactions
 
  The Indenture provides that the Company will not, and will not permit any of
its Restricted Subsidiaries to, enter into any sale and leaseback transaction;
provided that the Company or any of its Restricted Subsidiaries may enter into
a sale and leaseback transaction if (i) the Company or such Restricted
Subsidiary, as applicable, could have (a) incurred Indebtedness in an amount
equal to the Attributable Debt relating to such sale and leaseback transaction
pursuant to the Debt to Adjusted Consolidated Cash Flow Ratio test set forth
in the first paragraph of the covenant described above under the caption "--
Incurrence of Indebtedness and Issuance of Preferred Stock" and (b) incurred a
Lien to secure such Indebtedness pursuant to the covenant described above
 
                                      112
<PAGE>
 
under the caption "--Liens," (ii) the gross cash proceeds of such sale and
leaseback transaction are at least equal to the fair market value (as
determined in good faith by the Board of Directors) of the property that is
the subject of such sale and leaseback transaction and (iii) the transfer of
assets in such sale and leaseback transaction is permitted by, and the Company
applies the proceeds of such transaction in compliance with, the covenant
described above under the caption "--Repurchase at the Option of Holders--
Asset Sales."
 
 Limitation on Issuances and Sales of Capital Stock of Restricted Subsidiaries
 
  The Indenture provides that the Company (i) will not, and will not permit
any Restricted Subsidiary of the Company to, transfer, convey, sell, lease or
otherwise dispose of any Equity Interests in any Restricted Subsidiary of the
Company to any Person (other than the Company or a Wholly Owned Restricted
Subsidiary of the Company) and (ii) will not permit any Restricted Subsidiary
of the Company to issue any of its Equity Interests (other than, if necessary,
shares of its Capital Stock constituting directors' qualifying shares) to any
Person other than to the Company or a Wholly Owned Restricted Subsidiary of
the Company, unless, in each such case: (a) as a result of such transfer,
conveyance, sale, lease or other disposition or issuance such Restricted
Subsidiary no longer constitutes a Subsidiary and (b) the cash Net Proceeds
from such transfer, conveyance, sale, lease or other disposition or issuance
are applied in accordance with the covenant described above under the caption
"--Repurchase at the Option of Holders--Asset Sales."
 
 Limitations on Issuances of Guarantees of Indebtedness
 
  The Indenture provides that the Company will not permit any Restricted
Subsidiary, directly or indirectly, to Guarantee or pledge any assets to
secure the payment of any other Indebtedness of the Company unless such
Subsidiary simultaneously executes and delivers a supplemental indenture to
the Indenture providing for the Guarantee of the payment of the Notes by such
Subsidiary, which Guarantee shall be senior to or pari passu with such
Subsidiary's Guarantee of or pledge to secure such other Indebtedness.
Notwithstanding the foregoing, any such Guarantee by a Subsidiary of the Notes
shall provide by its terms that it shall be automatically and unconditionally
released and discharged upon any sale, exchange or transfer, to any Person
other than a Subsidiary of the Company, of all of the Company's stock in, or
all or substantially all the assets of, such Subsidiary, which sale, exchange
or transfer is made in compliance with the applicable provisions of the
Indenture. The form of such Guarantee will be attached as an exhibit to the
Indenture.
 
 Business Activities
 
  The Indenture provides that the Company will not, and will not permit any
Subsidiary to, engage in any business other than Permitted Businesses, except
to such extent as would not be material to the Company and its Subsidiaries
taken as a whole.
 
 Reports
   
  The Indenture provides that, whether or not required by the rules and
regulations of the Securities and Exchange Commission (the "Commission"), so
long as any Notes are outstanding, the Company will furnish to the Holders of
Notes (i) all quarterly and annual financial information that would be
required to be contained in a filing with the Commission on Forms 10-Q and 10-
K if the Company were required to file such Forms, including a "Management's
Discussion and Analysis of Financial Condition and Results of Operations" that
describes the financial condition and results of operations of the Company and
its consolidated Subsidiaries (showing in reasonable detail, in the footnotes
to the financial statements and in "Management's Discussion and Analysis of
Financial Condition and Results of Operations" (in each case to the extent not
prohibited by the Commission's rules and regulations), (a) the financial
condition and results of operations of the Company and its Restricted
Subsidiaries separate from the financial condition and results of operations
of the Unrestricted Subsidiaries of the Company and (b) the Tower Cash Flow
for the most recently completed fiscal quarter and the Adjusted Consolidated
Cash Flow for the most recently completed four-quarter period) and, with
respect to the annual information only, a report thereon by the Company's
certified independent accountants and (ii) all current reports that would be
required to be filed with the Commission on Form 8-K if the Company were
required to file such reports, in each case within the time periods specified
in the Commission's rules and regulations. In addition, following the
consummation of the exchange offer contemplated by the Registration     
 
                                      113
<PAGE>
 
Rights Agreement, whether or not required by the rules and regulations of the
Commission, the Company will file a copy of all such information and reports
with the Commission for public availability within the time periods specified
in the Commission's rules and regulations (unless the Commission will not
accept such a filing) and make such information available to securities
analysts and prospective investors upon request. In addition, the Company
will, for so long as any Notes remain outstanding, furnish to the Holders and
to securities analysts and prospective investors, upon their request, the
information required to be delivered pursuant to Rule 144A(d)(4) under the
Securities Act.
 
EVENTS OF DEFAULT AND REMEDIES
 
  The Indenture provides that each of the following constitutes an Event of
Default: (i) default for 30 days in the payment when due of interest on, or
Liquidated Damages with respect to, the Notes; (ii) default in payment when
due of the principal of or premium, if any, on the Notes; (iii) failure by the
Company or any of its Subsidiaries to comply with the provisions described
under the caption "--Certain Covenants--Merger, Consolidation or Sale of
Assets" or failure by the Company to consummate a Change of Control Offer or
Asset Sale Offer in accordance with the provisions of the Indenture applicable
thereto; (iv) failure by the Company or any of its Subsidiaries for 30 days
after notice to comply with any of its other agreements in the Indenture or
the Notes; (v) default under any mortgage, indenture or instrument under which
there may be issued or by which there may be secured or evidenced any
Indebtedness for money borrowed by the Company or any of its Significant
Subsidiaries (or the payment of which is guaranteed by the Company or any of
its Significant Subsidiaries) whether such Indebtedness or guarantee now
exists, or is created after the date of the Indenture, which default (a) is
caused by a failure to pay principal of or premium, if any, or interest on
such Indebtedness prior to the expiration of the grace period provided in such
Indebtedness on the date of such default (a "Payment Default") or (b) results
in the acceleration of such Indebtedness prior to its express maturity and, in
each case, the principal amount of any such Indebtedness, together with the
principal amount of any other such Indebtedness under which there has been a
Payment Default or the maturity of which has been so accelerated, aggregates
$5.0 million or more; (vi) failure by the Company or any of its Significant
Subsidiaries to pay final judgments aggregating in excess of $5.0 million,
which judgments are not paid, discharged or stayed for a period of 60 days; or
(vii) certain events of bankruptcy or insolvency with respect to the Company
or any of its Restricted Subsidiaries.
 
  If any Event of Default occurs and is continuing, the Trustee or the Holders
of at least 25% in principal amount at maturity of the then outstanding Notes
may declare all the Notes to be due and payable immediately. Notwithstanding
the foregoing, in the case of an Event of Default arising from certain events
of bankruptcy or insolvency, with respect to the Company, all outstanding
Notes will become due and payable without further action or notice. Holders of
the Notes may not enforce the Indenture or the Notes except as provided in the
Indenture. Subject to certain limitations, Holders of a majority in principal
amount at maturity of the then outstanding Notes may direct the Trustee in its
exercise of any trust or power.
 
  The Holders of a majority in aggregate principal amount at maturity of the
Notes then outstanding by notice to the Trustee may on behalf of the Holders
of all of the Notes waive any existing Default or Event of Default and its
consequences under the Indenture except a continuing Default or Event of
Default in the payment of interest on, or the principal of, the Notes.
 
  The Indenture provides that if a Default occurs and is continuing and is
known to the Trustee, the Trustee must mail to each holder of the Notes notice
of the Default within 90 days after it occurs. Except in the case of a Default
in the payment of principal of or interest on any Note, the Trustee may
withhold notice if and so long as a committee of its trust officers determines
that withholding notice is not opposed to the interest of the holders of the
Notes. In addition, the Company is required to deliver to the Trustee, within
90 days after the end of each fiscal year, a certificate indicating whether
the signers thereof know of any Default that occurred during the previous
year. The Company is also required to deliver to the Trustee, forthwith after
the occurrence thereof, written notice of any event that would constitute a
Default, the status thereof and what action the Company is taking or proposes
to take in respect thereof.
 
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<PAGE>
 
NO PERSONAL LIABILITY OF DIRECTORS, OFFICERS, EMPLOYEES AND STOCKHOLDERS
 
  No director, officer, employee, incorporator or stockholder of the Company,
as such, shall have any liability for any obligations of the Company under the
Notes, the Indenture or for any claim based on, in respect of, or by reason
of, such obligations or their creation. Each Holder of Notes by accepting a
Note waives and releases all such liability. The waiver and release are part
of the consideration for issuance of the Notes. Such waiver may not be
effective to waive liabilities under the federal securities laws and it is the
view of the Commission that such a waiver is against public policy.
 
LEGAL DEFEASANCE AND COVENANT DEFEASANCE
 
  The Company may, at its option and at any time, elect to have all of its
obligations discharged with respect to the outstanding Notes ("Legal
Defeasance") except for (i) the rights of Holders of outstanding Notes to
receive payments in respect of the principal of, premium, if any, and interest
and Liquidated Damages on such Notes when such payments are due from the trust
referred to below, (ii) the Company's obligations with respect to the Notes
concerning issuing temporary Notes, registration of Notes, mutilated,
destroyed, lost or stolen Notes and the maintenance of an office or agency for
payment and money for security payments held in trust, (iii) the rights,
powers, trusts, duties and immunities of the Trustee, and the Company's
obligations in connection therewith and (iv) the Legal Defeasance provisions
of the Indenture. In addition, the Company may, at its option and at any time,
elect to have the obligations of the Company released with respect to certain
covenants that are described in the Indenture ("Covenant Defeasance") and
thereafter any omission to comply with such obligations shall not constitute a
Default or Event of Default with respect to the Notes. In the event Covenant
Defeasance occurs, certain events (not including non-payment and bankruptcy,
receivership, rehabilitation and insolvency events with respect to the
Company) described under "--Events of Default and Remedies" will no longer
constitute an Event of Default with respect to the Notes.
 
  In order to exercise either Legal Defeasance or Covenant Defeasance, (i) the
Company must irrevocably deposit with the Trustee, in trust, for the benefit
of the Holders of the Notes, cash in United States dollars, non-callable
Government Securities, or a combination thereof, in such amounts as will be
sufficient, in the opinion of a nationally recognized firm of independent
public accountants, to pay the principal of, premium, if any, and interest and
Liquidated Damages on the outstanding Notes on the stated maturity or on the
applicable redemption date, as the case may be, and the Company must specify
whether the Notes are being defeased to maturity or to a particular redemption
date; (ii) in the case of Legal Defeasance, the Company shall have delivered
to the Trustee an opinion of counsel in the United States reasonably
acceptable to the Trustee confirming that (A) the Company has received from,
or there has been published by, the Internal Revenue Service a ruling or (B)
since the date of the Indenture, there has been a change in the applicable
federal income tax law, in either case to the effect that, and based thereon
such opinion of counsel shall confirm that, the Holders of the outstanding
Notes will not recognize income, gain or loss for federal income tax purposes
as a result of such Legal Defeasance and will be subject to federal income tax
on the same amounts, in the same manner and at the same times as would have
been the case if such Legal Defeasance had not occurred; (iii) in the case of
Covenant Defeasance, the Company shall have delivered to the Trustee an
opinion of counsel in the United States reasonably acceptable to the Trustee
confirming that the Holders of the outstanding Notes will not recognize
income, gain or loss for federal income tax purposes as a result of such
Covenant Defeasance and will be subject to federal income tax on the same
amounts, in the same manner and at the same times as would have been the case
if such Covenant Defeasance had not occurred; (iv) no Default or Event of
Default shall have occurred and be continuing on the date of such deposit
(other than a Default or Event of Default resulting from the borrowing of
funds to be applied to such deposit) or insofar as Events of Default from
bankruptcy or insolvency events with respect to the Company are concerned, at
any time in the period ending on the 91st day after the date of deposit; (v)
such Legal Defeasance or Covenant Defeasance will not result in a breach or
violation of, or constitute a default under any material agreement or
instrument (other than the Indenture) to which the Company or any of its
Restricted Subsidiaries is a party or by which the Company or any of its
Restricted Subsidiaries is bound; (vi) the Company must have delivered to the
Trustee an opinion of counsel to the effect that after the 91st day following
the deposit, the trust funds will not be subject to the effect of any
applicable bankruptcy, insolvency, reorganization
 
                                      115
<PAGE>
 
or similar laws affecting creditors' rights generally; (vii) the Company must
deliver to the Trustee an Officers' Certificate stating that the deposit was
not made by the Company with the intent of preferring the Holders of Notes
over the other creditors of the Company with the intent of defeating,
hindering, delaying or defrauding creditors of the Company or others; and
(viii) the Company must deliver to the Trustee an Officers' Certificate and an
opinion of counsel, each stating that all conditions precedent provided for
relating to the Legal Defeasance or the Covenant Defeasance have been complied
with.
 
TRANSFER AND EXCHANGE
 
  A Holder may transfer or exchange Notes in accordance with the Indenture.
The Registrar and the Trustee may require a Holder, among other things, to
furnish appropriate endorsements and transfer documents and the
Company may require a Holder to pay any taxes and fees required by law. The
Company is not required to transfer or exchange any Note selected for
redemption. Also, the Company is not required to transfer or exchange any Note
for a period of 15 days before a selection of Notes to be redeemed.
 
  The registered Holder of a Note will be treated as the owner of it for all
purposes.
 
AMENDMENT, SUPPLEMENT AND WAIVER
 
  Except as provided in the next two succeeding paragraphs, the Indenture or
the Notes may be amended or supplemented with the consent of the Holders of at
least a majority in principal amount at maturity of the Notes then outstanding
(including, without limitation, consents obtained in connection with a
purchase of, or tender offer or exchange offer for, Notes), and any existing
default or compliance with any provision of the Indenture or the Notes may be
waived with the consent of the Holders of a majority in principal amount at
maturity of the then outstanding Notes (including consents obtained in
connection with a tender offer or exchange offer for Notes).
 
  Without the consent of each Holder affected, an amendment or waiver may not
(with respect to any Notes held by a non-consenting Holder): (i) reduce the
principal amount of Notes whose Holders must consent to an amendment,
supplement or waiver, (ii) reduce the principal of or change the fixed
maturity of any Note or alter the provisions with respect to the redemption of
the Notes (specifically excluding the provisions relating to the covenants
described above under the caption "--Repurchase at the Option of Holders"),
(iii) reduce the rate of or change the time for payment of interest on any
Note, (iv) waive a Default or Event of Default in the payment of principal of
or premium, if any, or interest on the Notes (except a rescission of
acceleration of the Notes by the Holders of at least a majority in aggregate
principal amount of the Notes and a waiver of the payment default that
resulted from such acceleration), (v) make any Note payable in money other
than that stated in the Notes, (vi) make any change in the provisions of the
Indenture relating to waivers of past Defaults or the rights of Holders of
Notes to receive payments of principal of or premium, if any, or interest on
the Notes, (vii) waive a redemption payment with respect to any Note
(specifically excluding the payment required by one of the covenants described
above under the caption "--Repurchase at the Option of Holders"), (viii)
except as provided under the caption "--Legal Defeasance and Covenant
Defeasance" or in accordance with the terms of any Subsidiary Guarantee,
release a Subsidiary Guarantor from its obligations under its Subsidiary
Guarantee or make any change in a Subsidiary Guarantee that would adversely
affect the Holders of the Notes or (ix) make any change in the foregoing
amendment and waiver provisions.
 
  Notwithstanding the foregoing, without the consent of any Holder of Notes,
the Company and the Trustee may amend or supplement the Indenture or the Notes
to cure any ambiguity, defect or inconsistency, to provide for uncertificated
Notes in addition to or in place of certificated Notes, to provide for the
assumption of the Company's obligations to Holders of Notes in the case of a
merger or consolidation, to make any change that would provide any additional
rights or benefits to the Holders of Notes or that does not adversely affect
the legal rights under the Indenture of any such Holder, or to comply with
requirements of the Commission in order to effect or maintain the
qualification of the Indenture under the Trust Indenture Act.
 
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<PAGE>
 
CONCERNING THE TRUSTEE
 
  The Indenture contains certain limitations on the rights of the Trustee,
should it become a creditor of the Company, to obtain payment of claims in
certain cases, or to realize on certain property received in respect of any
such claim as security or otherwise. The Trustee will be permitted to engage
in other transactions; however, if it acquires any conflicting interest it
must eliminate such conflict within 90 days, apply to the Commission for
permission to continue or resign.
 
  The Holders of a majority in principal amount at maturity of the then
outstanding Notes will have the right to direct the time, method and place of
conducting any proceeding for exercising any remedy available to the Trustee,
subject to certain exceptions. The Indenture provides that in case an Event of
Default shall occur (which shall not be cured), the Trustee will be required,
in the exercise of its power, to use the degree of care of a prudent man in
the conduct of his own affairs. Subject to such provisions, the Trustee will
be under no obligation to exercise any of its rights or powers under the
Indenture at the request of any Holder of Notes, unless such Holder shall have
offered to the Trustee security and indemnity satisfactory to it against any
loss, liability or expense.
 
ADDITIONAL INFORMATION
 
  Anyone who receives this Prospectus may obtain a copy of the Indenture and
Registration Rights Agreement without charge by writing to Crown Castle
International Corp., 510 Bering Drive, Suite 500, Houston, Texas 77057,
Attention: Secretary.
 
BOOK-ENTRY, DELIVERY AND FORM
 
  The New Notes will be represented by one or more Notes in registered, global
form without interest coupons (collectively, the "Global Notes"). The Global
Notes will be deposited upon issuance with the Trustee as custodian for DTC,
in New York, New York, and registered in the name of DTC or its nominee, in
each case for credit to an account of a direct or indirect participant in DTC
as described below.
 
  Except as set forth below, the Global Notes may be transferred, in whole and
not in part, only to another nominee of DTC or to a successor of DTC or its
nominee. Beneficial interests in the Global Notes may not be exchanged for
Notes in certificated form except in the limited circumstances described
below. See "--Depositary Procedures--Exchange of Book-Entry Notes for
Certificated Notes." Except in the limited circumstances described below,
owners of beneficial interests in the Global Notes will not be entitled to
receive physical delivery of Certificated Notes (as defined below). Transfers
of beneficial interests in the Global Notes will be subject to the applicable
rules and procedures of DTC and its direct or indirect participants, which may
change from time to time.
 
  Initially, the Trustee will act as Paying Agent and Registrar. The Notes may
be presented for registration of transfer and exchange at the offices of the
Registrar.
 
DEPOSITARY PROCEDURES
 
  The following description of the operations and procedures of DTC is
provided solely as a matter of convenience. These operations and procedures
are solely within the control of DTC and are subject to changes by DTC from
time to time. The Company takes no responsibility for these operations and
procedures and urges investors to contact DTC or its participants directly to
discuss these matters.
 
  DTC has advised the Company that DTC is a limited-purpose trust company
created to hold securities for its participating organizations (collectively,
the "Participants") and to facilitate the clearance and settlement of
transactions in those securities between Participants through electronic book-
entry changes in accounts of its Participants. The Participants include
securities brokers and dealers (including the Initial Purchasers), banks,
trust companies, clearing corporations and certain other organizations. Access
to DTC's system is also available to other entities such as banks, brokers,
dealers and trust companies that clear through or maintain a custodial
relationship with a Participant, either directly or indirectly (collectively,
the "Indirect Participants"). Persons who are not Participants may
beneficially own securities held by or on behalf of DTC only through the
Participants or the Indirect Participants. The ownership interests in, and
transfers of ownership interests in, each security held by or on behalf of DTC
are recorded on the records of the Participants and Indirect Participants.
 
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<PAGE>
 
  DTC has also advised the Company that, pursuant to procedures established by
it, (i) upon deposit of the Global Notes, DTC will credit the accounts of
Participants designated by the Initial Purchasers with portions of the
principal amount of the Global Notes and (ii) ownership of such interests in
the Global Notes will be shown on, and the transfer of ownership thereof will
be effected only through, records maintained by DTC (with respect to the
Participants) or by the Participants and the Indirect Participants (with
respect to other owners of beneficial interest in the Global Notes).
 
  EXCEPT AS DESCRIBED BELOW, OWNERS OF INTEREST IN THE GLOBAL NOTES WILL NOT
HAVE NOTES REGISTERED IN THEIR NAMES, WILL NOT RECEIVE PHYSICAL DELIVERY OF
NOTES IN CERTIFICATED FORM AND WILL NOT BE CONSIDERED THE REGISTERED OWNERS OR
"HOLDERS" THEREOF UNDER THE INDENTURE FOR ANY PURPOSE.
 
  Payments in respect of the principal of, and premium, if any, Liquidated
Damages, if any, and interest on a Global Note registered in the name of DTC
or its nominee will be payable to DTC in its capacity as the registered Holder
under the Indenture. Under the terms of the Indenture, the Company and the
Trustee will treat the persons in whose names the Notes, including the Global
Notes, are registered as the owners thereof for the purpose of receiving such
payments and for any and all other purposes whatsoever. Consequently, neither
the Company, the Trustee nor any agent of the Company or the Trustee has or
will have any responsibility or liability for (i) any aspect of DTC's records
or any Participant's or Indirect Participant's records relating to or payments
made on account of beneficial ownership interest in the Global Notes, or for
maintaining, supervising or reviewing any of DTC's records or any
Participant's or Indirect Participant's records relating to the beneficial
ownership interests in the Global Notes or (ii) any other matter relating to
the actions and practices of DTC or any of its Participants
or Indirect Participants. DTC has advised the Company that its current
practice, upon receipt of any payment in respect of securities such as the
Notes (including principal and interest), is to credit the accounts of the
relevant Participants with the payment on the payment date, in amounts
proportionate to their respective holdings in the principal amount of
beneficial interest in the relevant security as shown on the records of DTC
unless DTC has reason to believe it will not receive payment on such payment
date. Payments by the Participants and the Indirect Participants to the
beneficial owners of Notes will be governed by standing instructions and
customary practices and will be the responsibility of the Participants or the
Indirect Participants and will not be the responsibility of DTC, the Trustee
or the Company. Neither the Company nor the Trustee will be liable for any
delay by DTC or any of its Participants in identifying the beneficial owners
of the Notes, and the Company and the Trustee may conclusively rely on and
will be protected in relying on instructions from DTC or its nominee for all
purposes.
 
  Interests in the Global Notes are expected to be eligible to trade in DTC's
Same-Day Funds Settlement System and secondary market trading activity in such
interests will, therefore, settle in immediately available funds, subject in
all cases to the rules and procedures of DTC and its Participants. See "--Same
Day Settlement and Payment." Transfers between Participants in DTC will be
effected in accordance with DTC's procedures, and will be settled in same day
funds.
 
  DTC has advised the Company that it will take any action permitted to be
taken by a Holder of Notes only at the direction of one or more Participants
to whose account DTC has credited the interests in the Global Notes and only
in respect of such portion of the aggregate principal amount of the Notes as
to which such Participant or Participants has or have given such direction.
However, if there is an Event of Default under the Notes, DTC reserves the
right to exchange the Global Notes for legended Notes in certificated form,
and to distribute such Notes to its Participants.
 
  Although DTC has agreed to the foregoing procedures to facilitate transfers
of interests in the Global Notes among Participants in DTC, it is under no
obligation to perform or to continue to perform such procedures, and such
procedures may be discontinued at any time. Neither the Company nor the
Trustee nor any of their respective agents will have any responsibility for
the performance by DTC or its participants or indirect participants of its
obligations under the rules and procedures governing its operations.
 
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<PAGE>
 
 Exchange of Book-Entry Notes for Certificated Notes
 
  A Global Note is exchangeable for definitive New Notes in registered
certificated form ("Certificated Notes") if (i) DTC (x) notifies the Company
that it is unwilling or unable to continue as depositary for the Global Notes
and the Company thereupon fails to appoint a successor depositary or (y) has
ceased to be a clearing agency registered under the Exchange Act, (ii) the
Company, at its option, notifies the Trustee in writing that it elects to
cause the issuance of the Certificated Notes or (iii) there shall have
occurred and be continuing a Default or Event of Default with respect to the
Notes. In addition, beneficial interests in a Global Note may be exchanged for
Certificated Notes upon request but only upon prior written notice given to
the Trustee by or on behalf of DTC in accordance with the Indenture. In all
cases, Certificated Notes delivered in exchange for any Global Note or
beneficial interests therein will be registered in the names, and issued in
any approved denominations, requested by or on behalf of the depositary (in
accordance with its customary procedures).
 
 Exchange of Certificated Notes for Book-Entry Notes
 
  New Notes issued in certificated form may not be exchanged for beneficial
interests in any Global Note unless the transferor first delivers to the
Trustee a written certificate (in the form provided in the Indenture) to the
effect that such transfer will comply with the appropriate transfer
restrictions applicable to such New Notes.
 
 Same Day Settlement and Payment
 
  The Indenture will require that payments in respect of the Notes represented
by the Global Notes (including principal, premium, if any, interest and
Liquidated Damages, if any) be made by wire transfer of immediately available
funds to the accounts specified by the Holder of Global Notes. With respect to
Notes in certificated form, the Company will make all payments of principal,
premium, if any, interest and Liquidated Damages, if any, by wire transfer of
immediately available funds to the accounts specified by the Holders thereof
or, if no such account is specified, by mailing a check to each such Holder's
registered address. The Notes represented by the Global Notes are eligible to
trade in the PORTAL market and to trade in the Depositary's Same-Day Funds
Settlement System, and any permitted secondary market trading activity in such
Notes will, therefore, be required by the Depositary to be settled in
immediately available funds. The Company expects that secondary trading in any
certificated Notes will also be settled in immediately available funds.
 
REGISTRATION RIGHTS; LIQUIDATED DAMAGES
 
  Holders of the New Notes are not entitled to any registration rights with
respect to the New Notes. The Company and the Initial Purchasers entered into
the Registration Rights Agreement for the benefit of the holders of Transfer
Restricted Securities on the Closing Date. Pursuant to the Registration Rights
Agreement, the Company agreed to file with the Commission the Exchange Offer
Registration Statement on the appropriate form under the Securities Act with
respect to the New Notes. The registration statement of which this Prospectus
is a part constitutes the Exchange Offer Registration Statement. The
Registration Rights Agreement provides that if (i) the Company is not required
to file the Exchange Offer Registration Statement or permitted to consummate
the Exchange Offer because the Exchange Offer is not permitted by applicable
law or Commission policy or (ii) any Holder of Transfer Restricted Securities
notifies the Company prior to the 20th day following consummation of the
Exchange Offer that (A) it is prohibited by law or Commission policy from
participating in the Exchange Offer or (B) that it may not resell the New
Notes acquired by it in the Exchange Offer to the public without delivering a
Prospectus and the Prospectus contained in the Exchange Offer Registration
Statement is not appropriate or available for such resales or (C) that it is a
broker-dealer and owns Notes acquired directly from the Company or an
affiliate of the Company, the Company will file with the Commission a Shelf
Registration Statement to cover resales of the Notes by the Holders thereof,
subject to such Holders satisfying certain conditions relating to the
provision of information in connection with the Shelf Registration Statement.
The Company has agreed that it will use all commercially reasonable efforts to
cause any such Shelf Registration Statement to be declared effective as
promptly as possible by the Commission. For purposes of the foregoing,
"Transfer Restricted Securities" means each Old Note until (i) the date on
which such Old Note has been exchanged by a person other than a broker-dealer
for a New Note in the Exchange Offer, (ii) following the
 
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<PAGE>
 
exchange by a broker-dealer in the Exchange Offer of an Old Note for a New
Note, the date on which such New Note is sold to a purchaser who receives from
such broker-dealer on or prior to the date of such sale a copy of the
Prospectus contained in the Exchange Offer Registration Statement, (iii) the
date on which such Old Note has been effectively registered under the
Securities Act and disposed of in accordance with the Shelf Registration
Statement or (iv) the date on which such Old Note is distributed to the public
pursuant to Rule 144 under the Act.
 
  The Registration Rights Agreement provides that (i) the Company will file an
Exchange Offer Registration Statement with the Commission on or prior to 45
days after the Closing Date, (ii) the Company will use all commercially
reasonable efforts to have the Exchange Offer Registration Statement declared
effective by the Commission on or prior to 150 days after the Closing Date,
(iii) unless the Exchange Offer would not be permitted by applicable law or
Commission policy, the Company will commence the Exchange Offer and use its
best efforts to issue on or prior to 30 business days after the date on which
the Exchange Offer Registration
Statement was declared effective by the Commission, New Notes in exchange for
all Old Notes tendered prior thereto in the Exchange Offer and (iv) if
obligated to file the Shelf Registration Statement, the Company will use its
best efforts to file the Shelf Registration Statement with the Commission on
or prior to 45 days after such filing obligation arises and to cause the Shelf
Registration to be declared effective by the Commission on or prior to 90 days
after such obligation arises. If (a) the Company fails to file any of the
Registration Statements required by the Registration Rights Agreement on or
before the date specified for such filing, (b) any of such Registration
Statements is not declared effective by the Commission on or prior to the date
specified for such effectiveness (the "Effectiveness Target Date"), or (c) the
Company fails to consummate the Exchange Offer within 30 business days of the
Effectiveness Target Date with respect to the Exchange Offer Registration
Statement, or (d) the Shelf Registration Statement or the Exchange Offer
Registration Statement is declared effective but thereafter ceases to be
effective or usable in connection with resales of Transfer Restricted
Securities during the periods specified in the Registration Rights Agreement
(each such event referred to in clauses (a) through (d) above a "Registration
Default"), then the Company will pay Liquidated Damages to each Holder of
Notes, with respect to the first 90-day period immediately following the
occurrence of the first Registration Default in an amount equal to $.05 per
week per $1,000 of the Accreted Value of the Notes held by such Holder. The
amount of the Liquidated Damages will increase by an additional $.05 per week
per $1,000 of the Accreted Value of the Notes with respect to each subsequent
90-day period until all Registration Defaults have been cured, up to a maximum
amount of Liquidated Damages for all Registration Defaults of $.50 per week
per $1,000 of the Accreted Value of the Notes. All accrued Liquidated Damages
will be paid by the Company on each interest payment date to the Holders of
record on the immediately preceding record date by wire transfer of
immediately available funds, in the case of the Holder of Global Notes, and to
Holders of Certificated Securities by wire transfer to the accounts specified
by them or by mailing checks to their registered addresses if no such accounts
have been specified. Following the cure of all Registration Defaults, the
accrual of Liquidated Damages will cease.
 
CERTAIN DEFINITIONS
 
  Set forth below are certain defined terms used in the Indenture. Reference
is made to the Indenture for a full disclosure of all such terms, as well as
any other capitalized terms used herein for which no definition is provided.
 
  "Accreted Value" means, as of any date of determination the sum of (a) the
initial Accreted Value (which is $597.65 per $1,000 in principal amount at
maturity of Notes) and (b) the portion of the excess of the principal amount
at maturity of each Note over such initial Accreted Value which shall have
been amortized through such date, such amount to be so amortized on a daily
basis and compounded semiannually on each May 15 and November 15 at the rate
of 10.625% per annum from the date of original issuance of the Notes through
the date of determination computed on the basis of a 360-day year of twelve
30-day months. The Accreted Value of any Note on or after the Full Accretion
Date shall be equal to 100% of its stated principal amount.
 
  "Acquired Debt" means, with respect to any specified Person, (i)
Indebtedness of any other Person existing at the time such other Person is
merged with or into or became a Subsidiary of such specified Person,
including,
 
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<PAGE>
 
without limitation, Indebtedness incurred in connection with, or in
contemplation of, such other Person merging with or into or becoming a
Subsidiary of such specified Person, and (ii) Indebtedness secured by a Lien
encumbering any asset acquired by such specified Person.
 
  "Adjusted Consolidated Cash Flow" has the meaning given to such term in the
definition of "Debt to Adjusted Consolidated Cash Flow Ratio."
 
  "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For purposes of this definition, "control"
(including, with correlative meanings, the terms "controlling," "controlled
by" and "under common control with"), as used with respect to any Person,
shall mean the possession, directly or indirectly, of the power to direct or
cause the direction of the management or policies of such Person, whether
through the ownership of voting securities, by agreement or otherwise;
provided that beneficial ownership of 10% or more of the Voting Stock of a
Person shall be deemed to be control.
 
  "Asset Sale" means (i) the sale, lease, conveyance or other disposition of
any assets or rights (including, without limitation, by way of a sale and
leaseback) provided that the sale, lease, conveyance or other disposition of
all or substantially all of the assets of the Company and its Subsidiaries
taken as a whole will be governed by the provisions of the Indenture described
above under the caption "--Repurchase at the Option of Holders--Change of
Control" and/or the provisions described above under the caption "--Repurchase
at the Option of Holders--Merger, Consolidation or Sale of Assets" and not by
the provisions of the Asset Sale covenant, and (ii) the issue or sale by the
Company or any of its Restricted Subsidiaries of Equity Interests of any of
the Company's Subsidiaries (other than directors' qualifying shares or shares
required by applicable law to be held by a Person other than the Company or a
Restricted Subsidiary), in the case of either clause (i) or (ii), whether in a
single transaction or a series of related transactions (a) that have a fair
market value in excess of $1.0 million or (b) for net proceeds in excess of
$1.0 million. Notwithstanding the foregoing, the following items shall not be
deemed to be Asset Sales: (i) a transfer of assets by the Company to a
Restricted Subsidiary or by a Restricted Subsidiary to the Company or to
another Restricted Subsidiary, (ii) an issuance of Equity Interests by a
Subsidiary to the Company or to another Restricted Subsidiary, (iii) a
Restricted Payment that is permitted by the covenant described above under the
caption "--Certain Covenants--Restricted Payments," (iv) grants of leases or
licenses in the ordinary course of business and (v) disposals of Cash
Equivalents.
 
  "Attributable Debt" in respect of a sale and leaseback transaction means, at
the time of determination, the present value (discounted at the rate of
interest implicit in such transaction, determined in accordance with GAAP) of
the obligation of the lessee for net rental payments during the remaining term
of the lease included in such sale and leaseback transaction (including any
period for which such lease has been extended or may, at the option of the
lessor, be extended).
 
  "Berkshire Group" means Berkshire Fund III, A Limited Partnership, Berkshire
Fund IV, Limited Partnership, Berkshire Investors LLC and Berkshire Partners
LLC.
 
  "Broker-Dealer" means any broker or dealer registered under the Exchange
Act.
 
  "Capital Lease Obligation" means, at the time any determination thereof is
to be made, the amount of the liability in respect of a capital lease that
would at such time be required to be capitalized on a balance sheet in
accordance with GAAP.
 
  "Capital Stock" means (i) in the case of a corporation, corporate stock,
(ii) in the case of an association or business entity, any and all shares,
interests, participations, rights or other equivalents (however designated) of
corporate stock, (iii) in the case of a partnership or limited liability
company, partnership or membership interests (whether general or limited) and
(iv) any other interest or participation that confers on a Person the right to
receive a share of the profits and losses of, or distributions of assets of,
the issuing Person.
 
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  "Cash Equivalents" means (i) United States dollars, (ii) securities issued
or directly and fully guaranteed or insured by the United States government or
any agency or instrumentality thereof (provided that the full faith and credit
of the United States is pledged in support thereof) having maturities of not
more than six months from the date of acquisition, (iii) certificates of
deposit and eurodollar time deposits with maturities of six months or less
from the date of acquisition, bankers' acceptances with maturities not
exceeding six months and overnight bank deposits, in each case with any lender
party to the Senior Credit Facility or with any domestic commercial bank
having capital and surplus in excess of $500.0 million and a Thompson Bank
Watch Rating of "B" or better, (iv) repurchase obligations with a term of not
more than seven days for underlying securities of the types described in
clauses (ii) and (iii) above entered into with any financial institution
meeting the qualifications specified in clause (iii) above, (v) commercial
paper having the highest rating obtainable from Moody's Investors Service,
Inc. or Standard & Poor's Ratings Group and in each case maturing within six
months after the date of acquisition and (vi) money market funds at least 95%
of the assets of which constitute Cash Equivalents of the kinds described in
clauses (i)-(v) of this definition.
 
  "Centennial Group" means Centennial Fund IV, L.P., Centennial Fund V, L.P.
and Centennial Entrepreneurs Fund V, L.P.
 
  "Change of Control" means the occurrence of any of the following: (i) the
sale, lease, transfer, conveyance or other disposition (other than by way of
merger or consolidation), in one or a series of related transactions, of all
or substantially all of the assets of the Company and its Restricted
Subsidiaries, taken as a whole to any "person" (as such term is used in
Section 13(d)(3) of the Exchange Act) other than a Principal or a Related
Party of a Principal; (ii) the adoption of a plan relating to the liquidation
or dissolution of the Company; (iii) the consummation of any transaction
(including, without limitation, any merger or consolidation) the result of
which is that any "person" (as defined above), other than the Principals and
their Related Parties, becomes the "beneficial owner" (as such term is defined
in Rule 13d-3 and Rule 13d-5 under the Exchange Act, except that a person
shall be deemed to have "beneficial ownership" of all securities that such
person has the right to acquire, whether such right is currently exercisable
or is exercisable only upon the occurrence of a subsequent condition),
directly or indirectly, of more than 50% of the Voting Stock of the Company
(measured by voting power rather than number of shares); provided that
transfers of Equity Interests in the Company between or among the beneficial
owners of the Company's Equity Interests and/or Equity Interests in CTSH, in
each case as of the date of the Indenture, will not be deemed to cause a
Change of Control under this clause (iii) so long as no single Person together
with its Affiliates acquires a beneficial interest in more of the Voting Stock
of the Company than is at the time collectively beneficially owned by the
Principals and their Related Parties; (iv) the first day on which a majority
of the members of the Board of Directors of the Company are not Continuing
Directors; or (v) the Company consolidates with, or merges with or into, any
Person, or any Person consolidates with, or merges with or into, the Company,
in any such event pursuant to a transaction in which any of the outstanding
Voting Stock of the Company is converted into or exchanged for cash,
securities or other property, other than any such transaction where (x) the
Voting Stock of the Company outstanding immediately prior to such transaction
is converted into or exchanged for Voting Stock (other than Disqualified
Stock) of the surviving or transferee Person constituting a majority of the
outstanding shares of such Voting Stock of such surviving or transferee Person
(immediately after giving effect to such issuance) or (y) the Principals and
their Related Parties own a majority of such outstanding shares after such
transaction.
 
  "Consolidated Cash Flow" means, with respect to any Person for any period,
the Consolidated Net Income of such Person for such period plus (i) provision
for taxes based on income or profits of such Person and its Restricted
Subsidiaries for such period, to the extent that such provision for taxes was
included in computing such Consolidated Net Income, plus (ii) consolidated
interest expense of such Person and its Restricted Subsidiaries for such
period, whether paid or accrued and whether or not capitalized (including,
without limitation, amortization of debt issuance costs and original issue
discount, non-cash interest payments, the interest component of any deferred
payment obligations, the interest component of all payments associated with
Capital Lease Obligations, imputed interest with respect to Attributable Debt,
commissions, discounts and other fees and charges incurred in respect of
letter of credit or bankers' acceptance financings, and net payments (if
 
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any) pursuant to Hedging Obligations), to the extent that any such expense was
deducted in computing such Consolidated Net Income, plus (iii) depreciation,
amortization (including amortization of goodwill and other intangibles and
other non-cash expenses (excluding any such non-cash expense to the extent
that it represents an accrual of or reserve for cash expenses in any future
period) of such Person and its Restricted Subsidiaries for such period to the
extent that such depreciation, amortization and other non-cash expenses were
deducted in computing such Consolidated Net Income, minus (iv) non-cash items
increasing such Consolidated Net Income for such period (excluding any items
that were accrued in the ordinary course of business), in each case on a
consolidated basis and determined in accordance with GAAP.
 
  "Consolidated Indebtedness" means, with respect to any Person as of any date
of determination, the sum, without duplication, of (i) the total amount of
Indebtedness of such Person and its Restricted Subsidiaries, plus (ii) the
total amount of Indebtedness of any other Person, to the extent that such
Indebtedness has been Guaranteed by the referent Person or one or more of its
Restricted Subsidiaries, plus (iii) the aggregate liquidation value of all
Disqualified Stock of such Person and all preferred stock of Restricted
Subsidiaries of such Person, in each case, determined on a consolidated basis
in accordance with GAAP.
 
  "Consolidated Net Income" means, with respect to any Person for any period,
the aggregate of the Net Income of such Person and its Restricted Subsidiaries
for such period, on a consolidated basis, determined in accordance with GAAP;
provided that (i) the Net Income (but not loss) of any Person other than the
Company that is not a Restricted Subsidiary or that is accounted for by the
equity method of accounting shall be included only to the extent of the amount
of dividends or distributions paid in cash to the referent Person or a
Restricted Subsidiary thereof, (ii) the Net Income of any Person acquired in a
pooling of interests transaction for any period prior to the date of such
acquisition shall be excluded, (iii) the cumulative effect of a change in
accounting principles shall be excluded and (iv) the Net Income (but not loss)
of any Unrestricted Subsidiary shall be excluded whether or not distributed to
the Company or one of its Restricted Subsidiaries.
 
  "Consolidated Tangible Assets" means, with respect to the Company, the total
consolidated assets of the Company and its Restricted Subsidiaries, less the
total intangible assets of the Company and its Restricted Subsidiaries, as
shown on the most recent internal consolidated balance sheet of the Company
and such Restricted Subsidiaries calculated on a consolidated basis in
accordance with GAAP.
 
  "Continuing Directors" means, as of any date of determination, any member of
the Board of Directors of the Company who (i) was a member of such Board of
Directors on the date of the Indenture, (ii) was nominated for election or
elected to such Board of Directors with the approval of a majority of the
Continuing Directors who were members of such Board at the time of such
nomination or election or (iii) is a designee of a Principal or was nominated
by a Principal.
 
  "Credit Facilities" means one or more debt facilities (including, without
limitation, the Senior Credit Facility) or commercial paper facilities with
banks or other institutional lenders providing for revolving credit loans,
term loans, receivables financing (including through the sale of receivables
to such lenders or to special purpose entities formed to borrow from such
lenders against such receivables) or letters of credit, in each case, as
amended, restated, modified, renewed, refunded, replaced or refinanced in
whole or in part from time to time.
 
  "CTSH" means Castle Transmission Services (Holdings) Ltd and its successors.
 
  "Debt to Adjusted Consolidated Cash Flow Ratio" means, as of any date of
determination, the ratio of (a) the Consolidated Indebtedness of the Company
as of such date to (b) the sum of (1) the Consolidated Cash Flow of the
Company for the four most recent full fiscal quarters ending immediately prior
to such date for which internal financial statements are available, less the
Company's Tower Cash Flow for such four-quarter period, plus (2) the product
of four times the Company's Tower Cash Flow for the most recent quarterly
period (such sum being referred to as "Adjusted Consolidated Cash Flow"), in
each case determined on a pro forma basis after giving effect to all
acquisitions or dispositions of assets made by the Company and its
Subsidiaries from the beginning of such four-quarter period through and
including such date of determination (including any related
 
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<PAGE>
 
financing transactions) as if such acquisitions and dispositions had occurred
at the beginning of such four-quarter period. For purposes of making the
computation referred to above, (i) acquisitions that have been made by the
Company or any of its Restricted Subsidiaries, including through mergers or
consolidations and including any related financing transactions, during the
reference period or subsequent to such reference period and on or prior to the
Calculation Date shall be deemed to have occurred on the first day of the
reference period and Consolidated Cash Flow for such reference period shall be
calculated without giving effect to clause (ii) of the proviso set forth in
definition of Consolidated Net Income, and (ii) the Consolidated Cash Flow
attributable to discontinued operations, as determined in accordance with
GAAP, and operations or businesses disposed of prior to Calculation Date,
shall be excluded.
 
  "Default" means any event that is, or with the passage of time or the giving
of notice or both would be, an Event of Default.
 
  "Disqualified Stock" means any Capital Stock that, by its terms (or by the
terms of any security into which it is convertible or for which it is
exchangeable, in each case, at the option of the holder thereof), or upon the
happening of any event, matures or is mandatorily redeemable, pursuant to a
sinking fund obligation or otherwise, or redeemable at the option of the
Holder thereof, in whole or in part, on or prior to the date that is 91 days
after the date on which the Notes mature; provided, however, that any Capital
Stock that would constitute Disqualified Stock solely because the holders
thereof have the right to require the Company to repurchase such Capital Stock
upon the occurrence of a Change of Control or an Asset Sale shall not
constitute Disqualified Stock if the terms of such Capital Stock provide that
the Company may not repurchase or redeem any such Capital Stock pursuant to
such provisions unless such repurchase or redemption complies with the
covenant described above the caption "--Certain Covenants--Restricted
Payments."
 
  "Eligible Indebtedness" means any Indebtedness other than (i) Indebtedness
in the form of, or represented by, bonds or other securities or any guarantee
thereof and (ii) Indebtedness that is, or may be, quoted, listed or purchased
and sold on any stock exchange, automated trading system or over-the-counter
or other securities market (including, without prejudice to the generality of
the foregoing, the market for securities eligible for resale pursuant to Rule
144A under the Securities Act).
 
  "Eligible Receivables" means the accounts receivable (net of any reserves
and allowances for doubtful accounts in accordance with GAAP) of the Company
and its Restricted Subsidiaries that are not more than 60 days past their due
date and that were entered into in the ordinary course of business on normal
payment terms as shown on the most recent internal consolidated balance sheet
of the Company and such Restricted Subsidiaries, all calculated on a
consolidated basis in accordance with GAAP.
 
  "Equity Interests" means Capital Stock and all warrants, options or other
rights to acquire Capital Stock (but excluding any debt security that is
convertible into, or exchangeable for, Capital Stock).
 
  "Exchange Offer" means exchange and issuance by the Company of a principal
amount of New Notes (which shall be registered pursuant to the Exchange Offer
Registration Statement) equal to the outstanding principal amount of Notes
that are tendered by such Holders in connection with such exchange and
issuance.
 
  "Exchange Offer Registration Statement" means the Registration Statement
relating to the Exchange Offer, including the related Prospectus.
 
  "Existing Indebtedness" means Indebtedness of the Company and its
Subsidiaries (other than Indebtedness under the Senior Credit Facility) in
existence on the date of the Indenture, until such amounts are repaid.
 
  "Full Accretion Date" means November 15, 2002.
 
  "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and
 
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<PAGE>
 
pronouncements of the Financial Accounting Standards Board or in such other
statements by such other entity as have been approved by a significant segment
of the accounting profession, which are in effect on the date of the
Indenture.
 
  "Guarantee" means a guarantee (other than by endorsement of negotiable
instruments for collection in the ordinary course of business), direct or
indirect, in any manner (including, without limitation, by way of a pledge of
assets or through letters of credit or reimbursement agreements in respect
thereof), of all or any part of any Indebtedness.
 
  "Hedging Obligations" means, with respect to any Person, the obligations of
such Person under (i) interest rate swap agreements, interest rate cap
agreements and interest rate collar agreements and (ii) other agreements or
arrangements designed to protect such Person against fluctuations in interest
rates or currency exchange rates.
 
  "Indebtedness" means, with respect to any Person, any indebtedness of such
Person, whether or not contingent, in respect of borrowed money or evidenced
by bonds, notes, debentures or similar instruments or letters of credit (or
reimbursement agreements in respect thereof) or banker's acceptances or
representing Capital Lease Obligations or the balance deferred and unpaid of
the purchase price of any property or representing any Hedging Obligations,
except any such balance that constitutes an accrued expense or trade payable,
if and to the extent any of the foregoing indebtedness (other than letters of
credit and Hedging Obligations) would appear as a liability upon a balance
sheet of such Person prepared in accordance with GAAP, as well as all
Indebtedness of others secured by a Lien on any asset of such Person whether
or not such Indebtedness is assumed by such Person (the amount of such
Indebtedness as of any date being deemed to be the lesser of the value of such
property or assets as of such date or the principal amount of such
Indebtedness of such other Person so secured) and, to the extent not otherwise
included, the Guarantee by such Person of any Indebtedness of any other
Person. The amount of any Indebtedness outstanding as of any date shall be (i)
the accreted value thereof, in the case of any Indebtedness issued with
original issue discount, and (ii) the principal amount thereof, together with
any interest thereon that is more than 30 days past due, in the case of any
other Indebtedness.
 
  "Investments" means, with respect to any Person, all investments by such
Person in other Persons (including Affiliates) in the forms of direct or
indirect loans (including guarantees of Indebtedness or other obligations),
advances or capital contributions (excluding commission, travel and similar
advances to officers and employees made in the ordinary course of business),
purchases or other acquisitions for consideration of Indebtedness, Equity
Interests or other securities, together with all items that are or would be
classified as investments on a balance sheet prepared in accordance with GAAP.
If the Company or any Restricted Subsidiary of the Company sells or otherwise
disposes of any Equity Interests of any direct or indirect Subsidiary of the
Company or a Restricted Subsidiary of the Company issues any of its Equity
Interests such that, in each case, after giving effect to any such sale or
disposition, such Person is no longer a Restricted Subsidiary of the Company,
the Company shall be deemed to have made an Investment on the date of any such
sale or disposition equal to the fair market value of the Equity Interests of
such Subsidiary not sold or disposed of in an amount determined as provided in
the final paragraph of the covenant described above under the caption "--
Certain Covenants--Restricted Payments."
 
  "Lien" means, with respect to any asset, any mortgage, lien, pledge, charge,
security interest or encumbrance of any kind in respect of such asset, whether
or not filed, recorded or otherwise perfected under applicable law (including
any conditional sale or other title retention agreement, any lease in the
nature thereof, any option or other agreement to sell or give a security
interest in and any filing of or agreement to give any financing statement
under the Uniform Commercial Code (or equivalent statutes) of any
jurisdiction).
 
  "Nassau Group" means Nassau Capital Partners II, L.P. and NAS Partners I,
L.L.C.
 
  "New Notes" means the Company's 10 5/8% Senior Discount Notes due 2007 to be
issued pursuant to the Indenture: (i) in the Exchange Offer or (ii) as
contemplated by Section 4 of the Registration Rights Agreement.
 
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<PAGE>
 
  "Net Income" means, with respect to any Person, the net income (loss) of
such Person, determined in accordance with GAAP and before any reduction in
respect of preferred stock dividends, excluding, however, (i) any gain or
loss, together with any related provision for taxes on such gain or loss,
realized in connection with (a) any Asset Sale (including, without limitation,
dispositions pursuant to sale and leaseback transactions) or (b) the
disposition of any securities by such Person or any of its Restricted
Subsidiaries or the extinguishment of any Indebtedness of such Person or any
of its Restricted Subsidiaries and (ii) any extraordinary gain or loss,
together with any related provision for taxes on such extraordinary gain or
loss.
 
  "Net Proceeds" means the aggregate cash proceeds received by the Company or
any of its Restricted Subsidiaries in respect of any Asset Sale (including,
without limitation, any cash received upon the sale or other disposition of
any non-cash consideration received in any Asset Sale), net of (i) the direct
costs relating to such Asset Sale (including, without limitation, legal,
accounting and investment banking fees, and sales commissions) and any
relocation expenses incurred as a result thereof, (ii) taxes paid or payable
as a result thereof (after taking into account any available tax credits or
deductions and any tax sharing arrangements), (iii) amounts required to be
applied to the repayment of Indebtedness (other than Indebtedness under a
Credit Facility) secured by a Lien on the asset or assets that were the
subject of such Asset Sale, (iv) all distributions and other payments required
to be made to minority interest holders in Restricted Subsidiaries as a result
of such Asset Sale, (v) the deduction of appropriate amounts provided by the
seller as a reserve in accordance with GAAP against any liabilities associated
with the assets disposed of in such Asset Sale and retained by the Company or
any Restricted Subsidiary after such Asset Sale and (vi) without duplication,
any reserves that the Company's Board of Directors determines in good faith
should be made in respect of the sale price of such asset or assets for post
closing adjustments; provided that in the case of any reversal of any reserve
referred to in clause (v) or (vi) above, the amount so reserved shall be
deemed to be Net Proceeds from an Asset Sale as of the date of such reversal.
 
  "Non-Recourse Debt" means Indebtedness (i) as to which neither the Company
nor any of its Restricted Subsidiaries (a) provides credit support of any kind
(including any undertaking, agreement or instrument that would constitute
Indebtedness), (b) is directly or indirectly liable (as a guarantor or
otherwise), or (c) constitutes the lender and (ii) no default with respect to
which (including any rights that the holders thereof may have to take
enforcement action against an Unrestricted Subsidiary) would permit (upon
notice, lapse of time or both) any holder of any other Indebtedness of the
Company or any of its Restricted Subsidiaries to declare a default on such
other Indebtedness or cause the payment thereof to be accelerated or payable
prior to its stated maturity; and (iii) as to which the lenders have been
notified in writing that they will not have any recourse to the stock or
assets of the Company or any of its Restricted Subsidiaries (except that this
clause (iii) will not apply to any Indebtedness incurred by CTSH and its
Subsidiaries prior to the date CTSH becomes a Subsidiary).
 
  "Obligations" means any principal, interest, penalties, fees,
indemnifications, reimbursements, damages and other liabilities payable under
the documentation governing any Indebtedness.
 
  "Permitted Business" means any business conducted by the Company, its
Restricted Subsidiaries or CTSH and its Subsidiaries on the date of the
Indenture and any other business related, ancillary or complementary to any
such business.
 
  "Permitted Investments" means (a) any Investment in the Company or in a
Restricted Subsidiary of the Company; (b) any Investment in Cash Equivalents;
(c) any Investment by the Company or any Restricted Subsidiary of the Company
in a Person, if as a result of such Investment (i) such Person becomes a
Restricted Subsidiary of the Company or (ii) such Person is merged,
consolidated or amalgamated with or into, or transfers or conveys
substantially all of its assets to, or is liquidated into, the Company or a
Restricted Subsidiary of the Company; provided, that any such Investment by
the Company or any Restricted Subsidiary of the Company in CTSH or its
Subsidiaries shall not be a Permitted Investment if CTSH is thereafter
designated an Unrestricted Subsidiary pursuant to clause (iv) of the second
paragraph of the covenant described above under the caption "--Certain
Covenants--Restricted Payments;" (d) any Restricted Investment made as a
result of the receipt of non-cash consideration from an Asset Sale that was
made pursuant to and in compliance with the covenant
 
                                      126
<PAGE>
 
described above under the caption "--Repurchase at the Option of Holders--
Asset Sales;" (e) any acquisition of assets solely in exchange for the
issuance of Equity Interests (other than Disqualified Stock) of the Company;
(f) receivables created in the ordinary course of business; (g) loans or
advances to employees made in the ordinary course of business not to exceed
$1.0 million at any one time outstanding; (h) securities and other assets
received in settlement of trade debts or other claims arising in the ordinary
course of business; (i) purchases of additional Equity Interests in CTSH for
cash pursuant to the Shareholders' Agreement as the same is in effect on the
date of the Indenture for aggregate cash consideration not to exceed $20
million since the date of the Indenture; and (j) other Investments in
Permitted Businesses not to exceed 5% of the Company's Consolidated Tangible
Assets at any one time outstanding (each such Investment being measured as of
the date made and without giving effect to subsequent changes in value).
 
  "Permitted Liens" means (i) Liens securing Eligible Indebtedness of the
Company under one or more Credit Facilities that was permitted by the terms of
the Indenture to be incurred or (ii) Liens securing any Indebtedness of any of
the Company's Restricted Subsidiaries that was permitted by the terms of the
Indenture to be incurred; (iii) Liens in favor of the Company; (iv) Liens
existing on the date of the Indenture; (v) Liens for taxes, assessments or
governmental charges or claims that are not yet delinquent or that are being
contested in good faith by appropriate proceedings promptly instituted and
diligently concluded, provided that any reserve or other appropriate provision
as shall be required in conformity with GAAP shall have been made therefor;
(vi) Liens securing Indebtedness permitted to be incurred under clause (iv) of
the second paragraph of the covenant described above under the caption "--
Certain Covenants--Incurrence of Indebtedness and Issuance of Preferred
Stock;" and (vii) Liens incurred in the ordinary course of business of the
Company or any Restricted Subsidiary of the Company with respect to
obligations that do not exceed $5.0 million at any one time outstanding and
that (a) are not incurred in connection with the borrowing of money or the
obtaining of advances or credit (other than trade credit in the ordinary
course of business) and (b) do not in the aggregate materially detract from
the value of the property or materially impair the use thereof in the
operation of business by the Company or such Restricted Subsidiary.
 
  "Permitted Refinancing Indebtedness" means any Indebtedness of the Company
or any of its Restricted Subsidiaries issued in exchange for, or the net
proceeds of which are used to extend, refinance, renew, replace, defease or
refund other Indebtedness of the Company or any of its Restricted Subsidiaries
(other than intercompany Indebtedness); provided that: (i) the principal
amount (or initial accreted value, if applicable) of such Permitted
Refinancing Indebtedness does not exceed the principal amount of (or accreted
value, if applicable), plus accrued interest on, the Indebtedness so extended,
refinanced, renewed, replaced, defeased or refunded (plus the amount of
expenses and prepayment premiums incurred in connection therewith); (ii) such
Permitted Refinancing Indebtedness has a final maturity date later than the
final maturity date of, and has a Weighted Average Life to Maturity equal to
or greater than the Weighted Average Life to Maturity of, the Indebtedness
being extended, refinanced, renewed, replaced, defeased or refunded; (iii) if
the Indebtedness being extended, refinanced, renewed, replaced, defeased or
refunded is subordinated in right of payment to the Notes, such Permitted
Refinancing Indebtedness is subordinated in right of payment to, the Notes on
terms at least as favorable to the Holders of Notes as those contained in the
documentation governing the Indebtedness being extended, refinanced, renewed,
replaced, defeased or refunded; and (iv) such Indebtedness is incurred either
by the Company or by the Restricted Subsidiary who is the obligor on the
Indebtedness being extended, refinanced, renewed, replaced, defeased or
refunded.
 
  "Person" means any individual, corporation, partnership, joint venture,
association, joint-stock company, trust, unincorporated organization or
government or agency or political subdivision thereof (including any
subdivision or ongoing business of any such entity or substantially all of the
assets of any such entity, subdivision or business).
 
  "Principals" means Berkshire Group, Centennial Group, Nassau Group,
TeleDiffusion de France International S.A. and any Related Party of the
foregoing.
 
  "Prospectus" means the prospectus included in a Registration Statement at
the time such Registration Statement is declared effective, as amended or
supplemented by any prospectus supplement and by all other
 
                                      127
<PAGE>
 
amendments thereto, including post-effective amendments, and all material
incorporated by reference into such Prospectus.
 
  "Public Equity Offering" means an underwritten primary public offering of
common stock of the Company pursuant to an effective registration statement
under the Securities Act.
 
  "Related Party" with respect to any Principal means (A) any controlling
stockholder, 80% (or more) owned Subsidiary of such Principal or (B) any
trust, corporation, partnership or other entity, the beneficiaries,
stockholders, members, partners, owners or Persons beneficially holding an 80%
or more controlling interest of which consist of such Principal and/or such
other Persons referred to in the immediately preceding clause (A).
 
  "Registration Statement" means any registration statement of the Company
relating to (a) an offering of New Notes pursuant to an Exchange Offer or (b)
the registration for resale of Transfer Restricted Securities pursuant to the
Shelf Registration Statement, in each case, (i) that is filed pursuant to the
provisions of the Registration Rights Agreement and (ii) including the
Prospectus included therein, all amendments and supplements thereto (including
post-effective amendments) and all exhibits and material incorporated by
reference therein.
 
  "Restricted Investment" means an Investment other than a Permitted
Investment.
 
  "Restricted Subsidiary" of a Person means any Subsidiary of the referent
Person that is not an Unrestricted Subsidiary.
 
  "Roll-Up" means the transaction pursuant to which CTSH becomes a Subsidiary
of the Company.
 
  "Senior Credit Facility" means that certain loan agreement, dated as of
April 26, 1995, as amended by the first amendment dated as of June 26, 1996,
the second amendment dated as of January 17, 1997, the third amendment dated
as of April 3, 1997, and the fourth amendment dated as of October 31, 1997, by
and among Keybank National Association and PNC Bank, National Association, as
arrangers and agents for those financial institutions listed therein, and
Castle Tower Corporation and Castle Tower Corporation (PR), including any
related notes, guarantees, collateral documents, instruments and agreements
executed in connection therewith, and in each case as amended, modified,
renewed, refunded, replaced or refinanced from time to time.
 
  "Shareholders' Agreement" means the agreement entered into by CTSH and its
four major shareholders, including the Company, on January 23, 1997, governing
the management and operation of CTSH and its Subsidiaries.
 
  "Shelf Registration Statement" means the Shelf Registration Statement as
defined in the Registration Rights Agreement.
 
  "Significant Subsidiary" means, with respect to any Person, any Restricted
Subsidiary of such Person that would be a "significant subsidiary" of such
Person as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated
pursuant to the Act, as such Regulation is in effect on the date hereof,
except that all references to "10 percent" in Rule 1-02(w)(1), (2) and (3)
shall mean "5 percent."
 
  "Stated Maturity" means, with respect to any installment of interest or
principal on any series of Indebtedness, the date on which such payment of
interest or principal was scheduled to be paid in the original documentation
governing such Indebtedness, and shall not include any contingent obligations
to repay, redeem or repurchase any such interest or principal prior to the
date originally scheduled for the payment thereof.
 
  "Strategic Equity Investment" means a cash contribution to the common equity
capital of the Company or a purchase from the Company of common Equity
Interests (other than Disqualified Stock), in either case by or from a
Strategic Equity Investor and for aggregate cash consideration of at least
$50.0 million.
 
  "Strategic Equity Investor" means a Person engaged in a Permitted Business
whose Total Equity Market Capitalization exceeds $1.0 billion.
 
                                      128
<PAGE>
 
  "Subsidiary" means, with respect to any Person, (i) any corporation,
association or other business entity of which more than 50% of the total
voting power of shares of Capital Stock entitled (without regard to the
occurrence of any contingency) to vote in the election of directors, managers
or trustees thereof is at the time owned or controlled, directly or
indirectly, by such Person or one or more of the other Subsidiaries of that
Person (or a combination thereof) and (ii) any partnership (a) the sole
general partner or the managing general partner of which is such Person or a
Subsidiary of such Person or (b) the only general partners of which are such
Person or of one or more Subsidiaries of such Person (or any combination
thereof).
 
  "Total Equity Market Capitalization" of any Person means, as of any day of
determination, the sum of (i) the product of (A) the aggregate number of
outstanding primary shares of common stock of such Person on such day (which
shall not include any options or warrants on, or securities convertible or
exchangeable into, shares of common stock of such person) multiplied by (B)
the average closing price of such common stock listed on a national securities
exchange or the Nasdaq National Market System over the 20 consecutive business
days immediately preceding such day, plus (ii) the liquidation value of any
outstanding shares of preferred stock of such Person on such day.
 
  "Tower Asset Exchange" means any transaction in which the Company or one of
its Restricted Subsidiaries exchanges assets for Tower Assets and/or cash or
Cash Equivalents where the fair market value (evidenced by a resolution of the
Board of Directors set forth in an Officers' Certificate delivered to the
Trustee) of the Tower Assets and cash or Cash Equivalents received by the
Company and its Restricted Subsidiaries in such exchange is at least equal to
the fair market value of the assets disposed of in such exchange.
 
  "Tower Assets" means wireless transmission towers and related assets that
are located on the site of a transmission tower.
 
  "Tower Cash Flow" means, for any period, the Consolidated Cash Flow of the
Company and its Restricted Subsidiaries for such period that is directly
attributable to site rental revenue or license fees paid to lease or sublease
space on communication sites owned or leased by the Company, all determined on
a consolidated basis and in accordance with GAAP. Tower Cash Flow will not
include revenue or expenses attributable to non-site rental services provided
by the Company or any of its Restricted Subsidiaries to lessees of
communication sites or revenues derived from the sale of assets.
 
  "Transfer Restricted Securities" means each Note, until the earliest to
occur of (a) the date on which such Note is exchanged in the Exchange Offer
and entitled to be resold to the public by the Holder thereof without
complying with the prospectus delivery requirements of the Act, (b) the date
on which such Note has been disposed of in accordance with a Shelf
Registration Statement, (c) the date on which such Note is disposed of by a
Broker-Dealer pursuant to the "Plan of Distribution" contemplated by the
Exchange Offer Registration Statement (including delivery of the Prospectus
contained therein) or (d) the date on which such Note is distributable to the
public pursuant to Rule 144 under the Act.
 
  "Unrestricted Subsidiary" means (i) any Subsidiary of the Company that is
designated by the Board of Directors as an Unrestricted Subsidiary pursuant to
a Board Resolution; but only to the extent that such Subsidiary: (a) has no
Indebtedness other than Non-Recourse Debt; (b) is not party to any agreement,
contract, arrangement or understanding with the Company or any Restricted
Subsidiary of the Company unless the terms of any such agreement, contract,
arrangement or understanding are no less favorable to the Company or such
Restricted Subsidiary than those that might be obtained at the time from
Persons who are not Affiliates of the Company; (c) is a Person with respect to
which neither the Company nor any of its Restricted Subsidiaries has any
direct or indirect obligation (x) to subscribe for additional Equity Interests
or (y) to maintain or preserve such Person's financial condition or to cause
such Person to achieve any specified levels of operating results; (d) has not
guaranteed or otherwise directly or indirectly provided credit support for any
Indebtedness of the Company or any of its Restricted Subsidiaries; and (e) has
at least one director on its board of directors that is not a director or
executive officer of the Company or any of its Restricted Subsidiaries and has
at least one executive officer that is not a director or executive officer of
the Company or any of its Restricted Subsidiaries.
 
                                      129
<PAGE>
 
Any such designation by the Board of Directors shall be evidenced to the
Trustee by filing with the Trustee a certified copy of the Board Resolution
giving effect to such designation and an Officers' Certificate certifying that
such designation complied with the foregoing conditions and was permitted by
the covenant described above under the caption "--Certain Covenants--
Restricted Payments." If, at any time, any Unrestricted Subsidiary would fail
to meet the foregoing requirements as an Unrestricted Subsidiary, it shall
thereafter cease to be an Unrestricted Subsidiary for purposes of the
Indenture and any Indebtedness of such Subsidiary shall be deemed to be
incurred by a Restricted Subsidiary of the Company as of such date (and, if
such Indebtedness is not permitted to be incurred as of such date under the
covenant described above under the caption "--Certain Covenants--Incurrence of
Indebtedness and Issuance of Preferred Stock," the Company shall be in default
of such covenant). The Board of Directors of the Company may at any time
designate any Unrestricted Subsidiary to be a Restricted Subsidiary; provided
that such designation shall be deemed to be an incurrence of Indebtedness by a
Restricted Subsidiary of the Company of any outstanding Indebtedness of such
Unrestricted Subsidiary and such designation shall only be permitted if (i)
such Indebtedness is permitted under the covenant described above under the
caption "--Certain Covenants--Incurrence of Indebtedness and Issuance of
Preferred Stock," calculated on a pro forma basis as if such designation had
occurred at the beginning of the four-quarter reference period, and (ii) no
Default would occur or be in existence following such designation.
 
  "Voting Stock" of any Person as of any date means the Capital Stock of such
Person that is at the time entitled to vote in the election of the Board of
Directors of such Person.
 
  "Weighted Average Life to Maturity" means, when applied to any Indebtedness
at any date, the number of years obtained by dividing (i) the sum of the
products obtained by multiplying (a) the amount of each then remaining
installment, sinking fund, serial maturity or other required payments of
principal, including payment at final maturity, in respect thereof, by (b) the
number of years (calculated to the nearest one-twelfth) that will elapse
between such date and the making of such payment, by (ii) the then outstanding
principal amount of such Indebtedness.
 
  "Wholly Owned Restricted Subsidiary" of any Person means a Restricted
Subsidiary of such Person all of the outstanding Capital Stock or other
ownership interests of which (other than directors' qualifying shares) shall
at the time be owned by such Person or by one or more Wholly Owned Restricted
Subsidiaries of such Person and one or more Wholly Owned Restricted
Subsidiaries of such Person.
 
                                      130
<PAGE>
 
            CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS
 
  The following general discussion summarizes certain of the material U.S.
federal income tax considerations of the Exchange Offer to holders of the Old
Notes. This discussion is a summary for general information only and does not
consider all aspects of U.S. federal income tax that may be relevant to a
holder of the Old Notes in light of such holder's personal circumstances. This
discussion also does not address the U.S. federal income tax consequences to
holders subject to special treatment under the U.S. federal income tax laws,
such as dealers in securities or foreign currency, tax-exempt entities, banks,
thrifts, insurance companies, persons that hold the Notes as part of a
"straddle," a "hedge" against currency risk or a "conversion transaction,"
persons that have a "functional currency" other than the U.S. dollar, and
investors in pass-through entities. In addition, this discussion does not
describe any tax consequences arising out of the tax laws of any state, local
or foreign jurisdiction.
 
  This discussion is based upon the Code, existing and proposed regulations
thereunder, Internal Revenue Service ("IRS") rulings and pronouncements and
judicial decisions now in effect, all of which are subject to change (possibly
on a retroactive basis). The Company has not and will not seek any rulings or
opinions from the IRS or counsel with respect to the matters discussed below.
There can be no assurance that the IRS will not take positions concerning the
tax consequences of the Exchange Offer which are different from those
discussed herein.
 
  HOLDERS OF OLD NOTES SHOULD CONSULT THEIR OWN ADVISORS CONCERNING THE
APPLICATION OF U.S. FEDERAL INCOME TAX LAWS, AS WELL AS THE LAWS OF ANY STATE,
LOCAL OR FOREIGN TAXING JURISDICTION, TO THE EXCHANGE OFFER IN LIGHT OF THEIR
PARTICULAR SITUATIONS.
 
  The exchange of Old Notes for New Notes pursuant to the Exchange Offer
should not constitute a taxable exchange. As a result, (i) a holder should not
recognize taxable gain or loss as a result of exchanging Old Notes for New
Notes pursuant to the Exchange Offer; (ii) the holding period of the New Notes
should include the holding period of the Old Notes exchanged therefor and
(iii) the adjusted tax basis of the New Notes should be the same as the
adjusted tax basis of the Old Notes exchanged therefor immediately before the
exchange.
 
                                      131
<PAGE>
 
                             PLAN OF DISTRIBUTION
 
  Each broker-dealer that receives New Notes for its own account in connection
with the Exchange Offer must acknowledge that it will deliver a prospectus in
connection with any resale of such New Notes. This Prospectus, as it may be
amended or supplemented from time to time, may be used by a broker-dealer in
connection with resales of New Notes received in exchange for Old Notes if
such Old Notes were acquired as a result of market-making activities or other
trading activities. The Company has agreed that for a period of 180 days after
the Expiration Date, it will make this Prospectus, as amended or supplemented,
available to any broker-dealer that requests such documents in the Letter of
Transmittal, for use in connection with any such resale. In addition, until
       (90 days after the date of this Prospectus), all dealers effecting
transactions in the New Notes may be required to deliver a prospectus.
 
  The Company will not receive any proceeds from any sale of New Notes by
broker-dealers. New Notes received by broker-dealers for their own account in
connection with the Exchange Offer may be sold from time to time in one or
more transactions in the over-the-counter market, in negotiated transactions,
through the writing of options on the New Notes or a combination of such
methods of resale, at market prices prevailing at the time of resale, at
prices related to such prevailing market prices or negotiated prices. Any such
resale may be made directly to purchasers or to or through brokers or dealers
who may receive compensation in the form of commissions or concessions from
any such broker-dealer and/or the purchasers of any such New Notes. Any
broker-dealer that resells New Notes that were received by it for its own
account in connection with the Exchange Offer and any broker or dealer that
participates in a distribution of such New Notes may be deemed to be an
"underwriter" within the meaning of the Securities Act, and any profit on any
such resale of New Notes and any commissions or concessions received by any
such persons may be deemed to be underwriting compensation under the
Securities Act. The Letter of Transmittal states that by acknowledging that it
will deliver and by delivering a prospectus, a broker-dealer will not be
deemed to admit that it is an "underwriter" within the meaning of the
Securities Act.
 
                                 LEGAL MATTERS
 
  The validity of the New Notes offered hereby will be passed upon for the
Company by Cravath, Swaine & Moore, New York, New York.
 
                                    EXPERTS
 
  The consolidated financial statements and schedule of the Company and the
combined financial statements of Crown at December 31, 1995 and 1996, and for
each of the two years in the period ended December 31, 1996, the financial
statements of the Home Service Transmission business of the BBC at March 31,
1996 and February 27, 1997, and for the year ended March 31, 1996 and the
period from April 1, 1996 to February 27, 1997 and the consolidated financial
statements of CTI at March 31, 1997 and for the period from February 28, 1997
to March 31, 1997, and the financial statements of TEA Group Incorporated at
December 31, 1996 and for the year then ended, have been included herein in
reliance upon the report of KPMG Peat Marwick LLP, independent certified
public accountants, appearing elsewhere herein, and upon the authority of said
firm as experts in accounting and auditing.
 
  The financial statements of TEA Group Incorporated at December 31, 1995 and
for the year then ended, appearing in this Prospectus and Registration
Statement have been audited by Ernst & Young LLP, independent auditors, as set
forth in their report thereon appearing elsewhere herein and are included in
reliance upon such report given upon the authority of such firm as experts in
accounting and auditing.
 
                                      132
<PAGE>
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>   
<S>                                                                        <C>
CROWN CASTLE INTERNATIONAL CORP.
Unaudited Financial Statements:
Consolidated Balance Sheet as of September 30, 1997 (unaudited)..........   F-3
Consolidated Statement of Operations for the nine month periods ended
 September 30, 1996 and 1997 (unaudited).................................   F-4
Consolidated Statement of Cash Flows for the nine month periods ended
 September 30, 1996 and 1997 (unaudited).................................   F-5
Condensed Notes to Consolidated Financial Statements for the nine month
 period ended September 30, 1997 (unaudited).............................   F-6
Audited Financial Statements:
Report of KPMG Peat Marwick LLP, Independent Certified Public
 Accountants.............................................................  F-13
Consolidated Balance Sheet as of December 31, 1995 and 1996..............  F-14
Consolidated Statement of Operations for each of the two years in the
 period ended December 31, 1996..........................................  F-15
Consolidated Statement of Cash Flows for each of the two years in the
 period ended December 31, 1996..........................................  F-16
Consolidated Statement of Stockholders' Equity for each of the two years
 in the period ended December 31, 1996...................................  F-17
Notes to Consolidated Financial Statements for each of the two years in
 the period ended December 31, 1996......................................  F-18
CROWN COMMUNICATIONS
Unaudited Financial Statements:
Combined Balance Sheet as of June 30, 1997 (unaudited)...................  F-30
Combined Statement of Income for the six month periods ended June 30,
 1996 and 1997 (unaudited)...............................................  F-31
Combined Statement of Cash Flows for each of the six month periods ended
 June 30, 1996 and 1997 (unaudited)......................................  F-32
Condensed Notes to Combined Financial Statements for the six month period
 ended June 30, 1997.....................................................  F-33
Audited Financial Statements:
Report of KPMG Peat Marwick LLP, Independent Certified Public
 Accountants.............................................................  F-35
Combined Balance Sheet as of December 31, 1995 and 1996..................  F-36
Combined Statement of Income for each of the two years in the period
 ended December 31, 1996.................................................  F-37
Combined Statement of Owners' Equity for each of the two years in the
 period ended December 31, 1996..........................................  F-38
Combined Statement of Cash Flows for each of the two years in the period
 ended December 31, 1996.................................................  F-39
Notes to Combined Financial Statements for each of the two years in the
 period ended December 31, 1996..........................................  F-40
TEA GROUP INCORPORATED
Report of Ernst & Young LLP, Independent Auditors........................  F-46
Report of KPMG Peat Marwick LLP, Independent Certified Public
 Accountants.............................................................  F-47
Balance Sheet as of December 31, 1995 and 1996...........................  F-48
Statement of Income for each of the two years in the period ended
 December 31, 1996, and for the three month periods ended March 31, 1996
 and 1997 (unaudited)....................................................  F-49
Statement of Shareholders' Equity for each of the two years in the period
 ended December 31, 1996.................................................  F-50
Statement of Cash Flows for each of the two years in the period ended
 December 31, 1996, and for the three month periods ended March 31, 1996
 and 1997 (unaudited)....................................................  F-51
Notes to Financial Statements for each of the two years in the period
 ended December 31, 1996.................................................  F-52
CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND THE BBC HOME SERVICE
 TRANSMISSION BUSINESS
Report of KPMG, Chartered Accountants ...................................  F-55
Profit and Loss Accounts of the BBC Home Service Transmission business
 for the Years ended March 31, 1995 and 1996 and the Period from April 1,
 1996 to February 27, 1997 and the Consolidated Profit and Loss Accounts
 of Castle Transmission Services (Holdings) Ltd for the Period from
 February 28, 1997 to March 31, 1997 and unaudited for the six month
 period ended September 30, 1997.........................................  F-56
</TABLE>    
 
                                      F-1
<PAGE>
 
<TABLE>
<S>                                                                        <C>
Balance Sheets of the BBC Home Service Transmission business at March 31,
 1995 and 1996 and Consolidated Balance Sheets of Castle Transmission
 Services (Holdings) Ltd at March 31, 1997 and unaudited at September 30,
 1997....................................................................  F-57
Cash Flow Statements of the BBC Home Service Transmission business for
 the Years ended March 31, 1995 and 1996 and the Period from April 1,
 1996 to February 27, 1997 and the Consolidated Cash Flow Statements of
 Castle Transmission Services (Holdings) Ltd for the Period from February
 28, 1997 to March 31, 1997 and unaudited for the six month period ended
 September 30, 1997......................................................  F-58
Reconciliation of Movements in Corporate Funding of the BBC Home Service
 Transmission business for the Years ended March 31, 1995 and 1996 and
 the Period from April 1, 1996 to February 27, 1997 and Consolidated
 Reconciliation of Movements in Shareholders' Funds of Castle
 Transmission Services (Holdings) Ltd for the Period from February 28,
 1997 to March 31, 1997 and unaudited for the six month period ended
 September 30, 1997......................................................  F-59
Notes to the Consolidated Financial Statements...........................  F-60
</TABLE>
 
                                      F-2
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
                           CONSOLIDATED BALANCE SHEET
 
                (IN THOUSANDS OF DOLLARS, EXCEPT SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                     DECEMBER 31, SEPTEMBER 30,
                                                         1996         1997
                                                     ------------ -------------
                                                                   (UNAUDITED)
<S>                                                  <C>          <C>
                       ASSETS
Current assets:
 Cash and cash equivalents..........................   $ 7,343      $ 13,095
 Receivables:
   Trade, net of allowance for doubtful accounts of
    $32 and $167 at December 31, 1996 and September
    30, 1997, respectively..........................       840         8,088
   Other............................................     1,081           630
 Inventories........................................       --          1,098
 Prepaid expenses and other current assets..........       149           433
                                                       -------      --------
     Total current assets...........................     9,413        23,344
Property and equipment, net of accumulated
 depreciation of $1,969 and $3,563 at December 31,
 1996 and September 30, 1997, respectively..........    26,753        69,855
Investments in and advances to affiliates...........     2,101        57,889
Goodwill and other intangible assets, net of
 accumulated amortization of $47 and $1,708 at
 December 31, 1996 and September 30, 1997,
 respectively.......................................       820       153,825
Other assets, net of accumulated amortization of
 $153 and $305 at December 31, 1996 and
 September 30, 1997, respectively...................     2,139         3,482
                                                       -------      --------
                                                       $41,226      $308,395
                                                       =======      ========
   LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Current liabilities:
 Accounts payable...................................   $ 1,048      $  3,346
 Accrued interest...................................        49         1,170
 Other accrued liabilities..........................       508         2,352
 Long-term debt, current maturities.................       140        78,745
                                                       -------      --------
     Total current liabilities......................     1,745        85,613
Accrued interest....................................       729           --
Long-term debt, less current maturities.............    21,912        51,036
Site rental deposits and other liabilities..........     1,500         1,564
                                                       -------      --------
     Total liabilities..............................    25,886       138,213
                                                       -------      --------
Commitments and contingencies (Note 8)
Redeemable preferred stock, $.01 par value;
 6,071,228 shares authorized:
 Senior Convertible Preferred Stock; shares issued:
  December 31, 1996--none and September 30, 1997--
  292,995 (stated at redemption value; aggregate
  liquidation value of $0 and $29,964, respective-
  ly)...............................................       --         29,761
 Series A Convertible Preferred Stock; shares
  issued: December 31, 1996--862,455 and September
  30, 1997--1,383,333 (stated at redemption and
  aggregate liquidation value)......................     5,175         8,300
 Series B Convertible Preferred Stock; 864,568
  shares issued (stated at redemption and aggregate
  liquidation value)................................    10,375        10,375
 Series C Convertible Preferred Stock; shares
  issued: December 31, 1996--none and September 30,
  1997--3,529,832 (stated at redemption and
  aggregate liquidation value)......................       --         74,126
                                                       -------      --------
     Total redeemable preferred stock...............    15,550       122,562
                                                       -------      --------
Stockholders' equity (deficit):
 Common stock, $.01 par value; 10,256,364 shares
  authorized:
  Class A Common Stock; shares issued: December 31,
   1996--270,000 and September 30, 1997--208,313....         3             2
  Class B Common Stock; shares issued: December 31,
   1996--297,666 and September 30, 1997--
   1,862,456........................................         3            19
 Additional paid-in capital.........................       762        57,654
 Cumulative foreign currency translation adjust-
  ment..............................................       --           (546)
 Accumulated deficit................................      (978)       (9,509)
                                                       -------      --------
     Total stockholders' equity (deficit)...........      (210)       47,620
                                                       -------      --------
                                                       $41,226      $308,395
                                                       =======      ========
</TABLE>
 
           See condensed notes to consolidated financial statements.
 
                                      F-3
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
                CONSOLIDATED STATEMENT OF OPERATIONS (UNAUDITED)
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                           NINE MONTHS ENDED
                                                             SEPTEMBER 30,
                                                           ------------------
                                                             1996      1997
                                                           --------  --------
<S>                                                        <C>       <C>
Net revenues:
  Site rental............................................. $  4,001  $  6,743
  Network services and other..............................      304    12,668
                                                           --------  --------
                                                              4,305    19,411
                                                           --------  --------
Operating expenses:
  Costs of operations (exclusive of depreciation and
   amortization):
    Site rental...........................................      937     1,422
    Network services and other............................      --      7,187
  General and administrative..............................    1,211     3,841
  Corporate development...................................      716     4,654
  Depreciation and amortization...........................      868     3,295
                                                           --------  --------
                                                              3,732    20,399
                                                           --------  --------
Operating income (loss)...................................      573      (988)
Other income (expense):
  Equity in losses of unconsolidated affiliate............      --     (1,189)
  Interest and other income...............................      101       441
  Interest expense and amortization of deferred financing
   costs..................................................   (1,229)   (4,368)
                                                           --------  --------
Loss before income taxes..................................     (555)   (6,104)
Provision for income taxes................................      --        (46)
                                                           --------  --------
Net loss..................................................     (555)   (6,150)
Dividends on Senior Convertible Preferred Stock...........      --       (461)
                                                           --------  --------
Net loss after deduction of dividends on Senior
 Convertible Preferred Stock.............................. $   (555) $ (6,611)
                                                           ========  ========
</TABLE>
 
 
           See condensed notes to consolidated financial statements.
 
                                      F-4
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
                CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED)
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                            NINE MONTHS ENDED
                                                              SEPTEMBER 30,
                                                            ------------------
                                                              1996      1997
                                                            --------  --------
<S>                                                         <C>       <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net loss................................................. $   (555) $ (6,150)
  Adjustments to reconcile net loss to net cash provided by
   (used for) operating activities:
    Depreciation and amortization..........................      868     3,295
    Equity in losses of unconsolidated affiliate...........      --      1,189
    Amortization of deferred financing costs...............       40       112
    Changes in assets and liabilities, excluding the
     effects of acquisitions:
      Decrease (increase) in receivables...................     (202)    2,709
      Increase in accrued interest.........................      383       774
      Decrease in accounts payable.........................     (132)   (3,129)
      Decrease (increase) in inventories, prepaid expenses
       and other assets....................................      305      (670)
      Decrease in other liabilities........................      (58)     (191)
                                                            --------  --------
        Net cash provided by (used for) operating
         activities........................................      649    (2,061)
                                                            --------  --------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Investments in affiliates................................   (2,000)  (59,487)
  Acquisitions of businesses, net of cash acquired.........  (10,601)  (32,460)
  Capital expenditures.....................................     (595)   (5,295)
                                                            --------  --------
        Net cash used for investing activities.............  (13,196)  (97,242)
                                                            --------  --------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Proceeds from issuance of capital stock..................   10,371   103,236
  Net borrowings under revolving credit agreements.........   11,000     7,471
  Principal payments on long-term debt.....................     (130)   (2,788)
  Purchase of capital stock................................      --     (2,132)
  Incurrence of financing costs............................     (173)     (732)
                                                            --------  --------
        Net cash provided by financing activities..........   21,068   105,055
                                                            --------  --------
NET INCREASE IN CASH AND CASH EQUIVALENTS..................    8,521     5,752
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD...........      596     7,343
                                                            --------  --------
CASH AND CASH EQUIVALENTS AT END OF PERIOD................. $  9,117  $ 13,095
                                                            ========  ========
SUPPLEMENTARY SCHEDULE OF NON-CASH INVESTING AND FINANCING
 ACTIVITIES:
  Conversion of stockholder's Convertible Secured
   Subordinated Note to Series A Convertible Preferred
   Stock................................................... $    --   $  3,657
  Amounts recorded in connection with acquisitions (see
   Note 2):
    Fair value of net assets acquired, including goodwill
     and other intangible assets...........................   10,634   195,733
    Issuance of long-term debt.............................      --     78,102
    Assumption of long-term debt...........................      --     27,982
    Issuance of Class B Common Stock.......................      --     56,777
    Amounts due to seller..................................       33       412
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
  Interest paid............................................ $    806  $  3,309
  Income taxes paid........................................      --         23
</TABLE>
 
           See condensed notes to consolidated financial statements.
 
                                      F-5
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
             CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1. GENERAL
 
  The information contained in the following notes to the consolidated
financial statements is condensed from that which would appear in the annual
consolidated financial statements; accordingly, the consolidated financial
statements included herein should be reviewed in conjunction with the
consolidated financial statements for the fiscal year ended December 31, 1996,
and related notes thereto, of Crown Castle International Corp. (formerly
Castle Tower Holding Corp.) included elsewhere herein. All references to the
"Company" include Crown Castle International Corp. and its subsidiary
companies unless otherwise indicated or the context indicates otherwise.
 
  The consolidated financial statements included herein are unaudited;
however, they include all adjustments (consisting only of normal recurring
adjustments) which, in the opinion of management, are necessary to present
fairly the consolidated financial position of the Company at September 30,
1997 and the consolidated results of operations and consolidated cash flows
for the nine months ended September 30, 1996 and 1997. Accounting measurements
at interim dates inherently involve greater reliance on estimates than at year
end. The results of operations for the interim periods presented are not
necessarily indicative of the results to be expected for the entire year.
 
 Recent Accounting Pronouncements
 
  In February 1997, the Financial Accounting Standards Board (the "FASB")
issued Statement of Financial Accounting Standards No. 128, Earnings per Share
("SFAS 128"). SFAS 128 establishes new standards for computing and presenting
earnings per share ("EPS") amounts for companies with publicly held common
stock or potential common stock. The new standards require the presentation of
both basic and diluted EPS amounts for companies with complex capital
structures. Basic EPS is computed by dividing income available to common
stockholders by the weighted-average number of common shares outstanding for
the period, and excludes the effect of potentially dilutive securities (such
as options, warrants and convertible securities) which are convertible into
common stock. Dilutive EPS reflects the potential dilution from such
convertible securities. SFAS 128 is effective for periods ending after
December 15, 1997. The Company will adopt the requirements of SFAS 128 at such
time as it has publicly held common stock.
 
  In February 1997, the FASB issued Statement of Financial Accounting
Standards No. 129, Disclosure of Information about Capital Structure ("SFAS
129"). SFAS 129 establishes standards for disclosing information about a
company's outstanding debt and equity securities and eliminates exemptions
from such reporting requirements for nonpublic companies. SFAS 129 is
effective for periods ending after December 15, 1997. The Company has adopted
the requirements of SFAS 129 in its financial statements for the year ended
December 31, 1996.
 
  In June 1997, the FASB issued Statement of Financial Accounting Standards
No. 130, Reporting Comprehensive Income ("SFAS 130"). SFAS 130 establishes
standards for the reporting and display of comprehensive income in a company's
financial statements. Comprehensive income includes all changes in a company's
equity accounts (including net income or loss) except investments by, or
distributions to, the company's owners. Items which are components of
comprehensive income (other than net income or loss) include foreign currency
translation adjustments, minimum pension liability adjustments and unrealized
gains and losses on certain investments in debt and equity securities. The
components of comprehensive income must be reported in a financial statement
that is displayed with the same prominence as other financial statements. SFAS
130 is effective for fiscal years beginning after December 15, 1997. The
Company will adopt the requirements of SFAS 130 in 1998.
 
  In June 1997, the FASB issued Statement of Financial Accounting Standards
No. 131, Disclosures about Segments of an Enterprise and Related Information
("SFAS 131"). SFAS 131 establishes standards for the way
 
                                      F-6
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
       CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
that public companies report, in their annual financial statements, certain
information about their operating segments, their products and services, the
geographic areas in which they operate and their major customers. SFAS 131
also requires that certain information about operating segments be reported in
interim financial statements. SFAS 131 is effective for periods beginning
after December 15, 1997. The Company will adopt the requirements of SFAS 131
in 1998.
 
2. ACQUISITIONS
 
  On May 12, 1997, the Company acquired all of the common stock of TEA Group
Incorporated and TeleStructures, Inc. (collectively, "TEA") in a business
acquisition which was accounted for using the purchase method. Results of
operations and cash flows of TEA are included in the consolidated financial
statements for the period subsequent to the date of acquisition. TEA provides
telecommunications site acquisition, design and development services. The
purchase price of $14,211,000 consisted of $8,116,000 in cash (of which
$2,001,000 was paid in 1996 as an option payment), promissory notes payable to
the former stockholders of TEA totaling $1,872,000 (see Note 4), the
assumption of $1,973,000 in outstanding debt and 107,142 shares of the
Company's Class B Common Stock valued at $2,250,000. The Company recognized
goodwill of $9,565,000 in connection with this acquisition.
 
  On July 11, 1997, the Company entered into an asset purchase and merger
agreement with the owners of Crown Communications ("CCM"), Crown Network
Systems, Inc. ("CNS") and Crown Mobile Systems, Inc. ("CMS") (collectively,
"Crown"). On August 15, 1997, such agreement was amended and restated, and the
Company acquired (i) substantially all of the assets, net of outstanding
liabilities, of CCM and (ii) all of the outstanding common stock of CNS and
CMS. This acquisition was accounted for using the purchase method. Results of
operations and cash flows of Crown are included in the consolidated financial
statements for the period subsequent to the date of acquisition. Crown
provides network services, which includes site selection and acquisition,
antennae installation, site development and construction, network design and
site maintenance, and owns and operates telecommunications towers and related
assets. The purchase price of $183,060,000 consists of $25,882,000 in cash, a
short-term promissory note payable to the former owners of Crown for
$76,230,000 (see Note 4), the assumption of $26,009,000 in outstanding debt
and 1,465,000 shares of the Company's Class B Common Stock valued at
$54,939,000 (the estimated fair value of such common stock on that date). At
September 30, 1997, the Company had yet to issue 10,977 of such shares of
common stock to the sellers pending the resolution of certain post-closing
contingencies. Such contingencies were resolved in October 1997 and the
additional shares were issued at that time. An amount due to seller for
$412,000 (representing the value of the unissued shares) is included in other
accrued liabilities on the Company's consolidated balance sheet at September
30, 1997. The Company recognized goodwill and other intangible assets of
$145,101,000 in connection with this acquisition. The Company financed the
cash portion of the purchase price with proceeds from the issuance of
redeemable preferred stock (see Note 5), and repaid the promissory note with
proceeds from the issuance of additional redeemable preferred stock and
borrowings under an amended bank credit agreement (see Note 7).
 
  The following unaudited pro forma summary presents consolidated results of
operations for the Company as if (i) the 1996 acquisitions had been
consummated on January 1, 1996 and (ii) the TEA and Crown acquisitions had
been consummated as of January 1 for both 1996 and 1997. Appropriate
adjustments have been reflected for depreciation and amortization, interest
expense, amortization of deferred financial costs and income taxes. The pro
forma information does not necessarily reflect the actual results that would
have been achieved, nor is it necessarily indicative of future consolidated
results for the Company.
 
<TABLE>
<CAPTION>
                                                         NINE MONTHS ENDED
                                                           SEPTEMBER 30,
                                                     --------------------------
                                                         1996          1997
                                                     ------------  ------------
                                                     (IN THOUSANDS OF DOLLARS)
<S>                                                  <C>           <C>
Net revenues........................................ $     30,849  $     44,791
Net loss............................................      (11,430)      (11,271)
</TABLE>
 
                                      F-7
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
       CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
  Agreement with Nextel Communications, Inc. ("Nextel")
 
  On July 11, 1997, the Company entered into an agreement with Nextel (the
"Nextel Agreement") whereby the Company has the option to purchase up to 50 of
Nextel's existing towers which are located in Texas, Florida and the
metropolitan areas of Denver, Colorado and Philadelphia, Pennsylvania. The
Company must exercise its option to purchase such towers within 120 days from
the date of the agreement. In addition, the Nextel Agreement provides the
Company with the option to construct or purchase up to 250 new towers for
Nextel in various geographic corridors.
 
3. INVESTMENTS IN AND ADVANCES TO AFFILIATES
 
 Investment in Castle Transmission Services (Holdings) Ltd ("CTI")
 
  On February 28, 1997, the Company used a portion of the net proceeds from
the sale of the Series C Convertible Preferred Stock (see Note 5) to purchase
an ownership interest of approximately 34.26% in CTI (a company incorporated
under the laws of England and Wales). The Company led a consortium of
investors which provided the equity financing for CTI. The funds invested by
the consortium were used by CTI to purchase, through a wholly owned
subsidiary, the broadcast transmission division of the British Broadcasting
Corporation (the "BBC"). The cost of the Company's investment in CTI amounted
to approximately $57,542,000. The Company accounts for its investment in CTI
utilizing the equity method of accounting.
 
  In March 1997, as compensation for leading the investment consortium, the
Company received a fee from CTI amounting to approximately $1,165,000. This
fee was recorded as revenue by the Company when received. In addition, the
Company received approximately $1,679,000 from CTI as reimbursement for costs
incurred prior to the closing of the purchase of BBC. At December 31, 1996,
approximately $953,000 of such reimbursable costs are included in other
receivables on the Company's consolidated balance sheet.
 
  The Company receives a monthly service fee from CTI of approximately $33,000
as compensation for certain management services. This fee is included in
network services and other revenues on the Company's consolidated statement of
operations.
 
  CTI uses the British pound as the functional currency for its operations.
The Company translates its equity in the earnings and losses of CTI using the
average exchange rate for the period, and translates its investment in CTI
using the exchange rate at the end of the period. The cumulative effect of
changes in the exchange rate is recorded as a translation adjustment in
stockholders' equity.
 
  In June 1997, as compensation for the successful completion of the
investment in CTI and certain other acquisitions and investments, the Company
paid bonuses to two of its executive officers totaling $913,000. These bonuses
are included in corporate development expenses on the Company's consolidated
statement of operations.
 
  Investment in Visual Intelligence Systems, Inc. ("VISI")
 
  On June 23, 1997, the Company made an investment in VISI of $2,000,000 (of
which $100,000 was paid in 1996 as an advance). VISI intends to provide
computerized geographic information for a variety of business applications,
including the acquisition and design of telecommunications sites. The
Company's investment was made in the form of 15,000 shares of VISI's common
stock at a price of $2.00 per share, along with a Convertible Subordinated
Note for $1,970,000 (the "VISI Note"). The VISI Note is convertible (at the
option
 
                                      F-8
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
       CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
of the Company) into shares of VISI's common stock at a conversion price of
$2.00 per share, bears interest at 7.11% per year and is due on May 31, 2007.
The 15,000 shares of common stock purchased by the Company represent an
ownership interest of approximately 1.14% in VISI. The Company accounts for
its investment in VISI's common stock utilizing the cost method of accounting.
 
4. LONG-TERM DEBT
 
  Long-term debt consists of the following:
 
<TABLE>
<CAPTION>
                                                    DECEMBER 31, SEPTEMBER 30,
                                                        1996         1997
                                                    ------------ -------------
                                                    (IN THOUSANDS OF DOLLARS)
   <S>                                              <C>          <C>
   Bank Credit Agreement:
     Revolving Credit Facility.....................   $15,700      $ 19,000
     Term Note.....................................     2,300            --
   Crown Bank Credit Agreement:
     Crown Revolving Credit Facility...............        --        17,450
     Crown Term Note...............................        --        12,833
   TEA Bank Line of Credit.........................        --           394
   Promissory Note payable to former stockholders
    of Crown.......................................        --        76,230
   Promissory Notes payable to former stockholders
    of TEA.........................................        --         1,872
   Promissory Note payable to PCI..................       632           492
   Promissory Note payable for tower site..........       295           294
   Installment notes payable.......................        --         1,216
   Convertible Secured Subordinated Notes payable
    to stockholder.................................     3,125            --
                                                      -------      --------
                                                       22,052       129,781
   Less: current maturities........................      (140)      (78,745)
                                                      -------      --------
                                                      $21,912      $ 51,036
                                                      =======      ========
</TABLE>
 
  Bank Credit Agreement
 
  On April 26, 1995, Castle Tower Corporation ("CTC," a wholly owned
subsidiary of the Company) entered into a credit agreement with a bank (as
amended, the "Bank Credit Agreement"). The Bank Credit Agreement consisted of
secured revolving lines of credit (the "Reducing Commitment" and the "Working
Capital Commitment," collectively referred to as the "Revolving Credit
Facility") and a $2,300,000 term note (the "Term Note"). On January 17, 1997,
the Bank Credit Agreement was amended to: (i) increase the available
borrowings under the Reducing Commitment to $49,000,000; (ii) repay the Term
Note, along with accrued interest thereon, with borrowings under the Reducing
Commitment; and (iii) extend the termination date for the Bank Credit
Agreement to December 31, 2003. Available borrowings under the Reducing
Commitment will generally be used to construct new towers and to finance a
portion of the purchase price for towers and related assets. The portion of
such purchase price which may be borrowed is based on the current financial
performance (as defined) of: (i) the assets to be acquired; and (ii) assets
acquired in previous acquisitions. In addition, up to $5,000,000 of borrowing
availability under the Reducing Commitment may be used for letters of credit
until December 31, 1998. There were no letters of credit outstanding at
September 30, 1997. The Working Capital Commitment provides for borrowings of
up to $1,000,000 for working capital purposes.
 
  Crown Bank Credit Agreement
 
  On November 22, 1995, Crown and its owners entered into a restated credit
agreement with a bank (as amended, the "Crown Bank Credit Agreement"). The
Crown Bank Credit Agreement made available to the borrowers (i) a term note in
the original amount of $9,964,000 to refinance existing debt, and (ii) a
$5,000,000
 
                                      F-9
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
       CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
secured line of credit. On September 19, 1996, the Crown Bank Credit Agreement
was amended to provide for a $14,000,000 term note (the "Crown Term Note") and
a $15,000,000 secured revolving line of credit (the "Crown Revolving Credit
Facility"). In August 1997, the Crown Bank Credit Agreement was further
amended to increase the Crown Revolving Credit Facility to $27,000,000.
 
  The Crown Term Note is payable in twenty-seven equal quarterly installments
of $292,000 commencing on December 31, 1996, plus a final installment of the
outstanding principal balance and all accrued and unpaid interest on September
19, 2003. In addition, on June 30 of each year, the Crown Term Note shall be
reduced by an amount equal to 25% of the borrowers' excess cash flow, as
defined. The Crown Term Note bears interest, at the option of the borrowers
with restrictions, at either the Eurodollar rate plus 2.0% per annum or an
"as-offered rate' (as defined) plus 2.0% per annum. The interest rate on the
Crown Term Note is 7.72% at September 30, 1997.
 
  The Crown Revolving Credit Facility provides for quarterly interest payments
based on either the Eurodollar rate plus 2.0% per annum or the Federal Funds
rate plus 2.0% per annum (7.43% as of September 30, 1997). Borrowings under
this facility are limited by a "borrowing base' as defined. On each of three
conversion dates (September 19, 1997, 1998 and 1999), the then aggregate
outstanding principal balances under the Crown Revolving Credit Facility are
to be converted to term loans and the line of credit commitment will be
permanently reduced by such converted amount. Any such principal amount so
converted will be payable in twenty-seven equal quarterly installments,
beginning on the last day of December following such conversion date, in an
amount equal to 1/48 of the converted balance, plus a final installment of the
outstanding principal balance and all accrued and unpaid interest on September
19, 2003.
 
  The Crown Bank Credit Agreement is secured by substantially all of Crown's
assets and assignment of tower leases, requires Crown to maintain certain
financial covenants and places restrictions on Crown's ability to, among other
things, incur debt and liens, dispose of assets, undertake transactions with
affiliates and make investments.
 
  TEA Bank Line of Credit
 
  TEA Group Incorporated has a revolving line of credit with a bank for
working capital purposes (as amended, the "TEA Bank Line of Credit"). On July
30, 1997, the TEA Bank Line of Credit was amended to decrease the available
borrowings to $3,000,000 and extend the termination date to June 30, 1998.
Borrowings are secured by TEA Group Incorporated receivables, property and
equipment, intangibles and cash balances, and bear interest at a rate per
annum equal to a Eurodollar interbank offered rate (LIBOR) plus 2.7% (8.36% at
September 30, 1997). Interest is payable monthly. The TEA Bank Line of Credit
requires TEA Group Incorporated to maintain certain financial covenants and
places restrictions on its ability to, among other things, incur debt and
liens, pay dividends, undertake transactions with affiliates and make
investments.
 
  Promissory Note Payable to Former Stockholders of Crown
 
  This note was repaid upon its maturity date at October 31, 1997, and bore
interest at a rate of 11% per annum. See Note 7.
 
  Promissory Notes Payable to Former Stockholders of TEA
 
  These unsecured notes mature on December 31, 1998, bear interest at a rate
of 8% per annum and call for payments of principal and interest totaling
$560,000 on April 1, 1998. The notes call for mandatory prepayment in the
event of an underwritten public offering of the Company's common stock.
 
                                     F-10
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
       CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
  Installment notes payable
 
  The installment notes payable mature at various dates from 1997 to 2002,
bear interest at rates ranging from 4.80% to 12.62% per annum, call for
monthly payments of principal and interest and are secured by Crown's
automobiles and other equipment.
 
  Convertible Secured Subordinated Notes Payable to Stockholder (the
"Convertible Notes")
 
  On February 24, 1997, the remaining $3,125,000 principal amount of the
Convertible Notes was converted into 520,878 shares of the Company's Series A
Convertible Preferred Stock and, by mutual agreement with the holder, the
related accrued interest was forfeited. Upon conversion of the notes, the
principal amount and the forfeited interest were accounted for as an increase
to stockholders' equity.
 
5. REDEEMABLE PREFERRED STOCK
 
  In February and April of 1997, the Company issued 3,529,832 shares of its
Series C Convertible Preferred Stock (the "Series C Preferred Stock") at a
price of $21.00 per share. The net proceeds received by the Company from the
sale of the Series C Preferred Stock amounted to approximately $74,024,000. A
portion of this amount was used to purchase the ownership interest in CTI (see
Note 3).
 
  The holders of the Series C Preferred Stock are generally entitled to the
same rights and privileges as the Series B Preferred Stock and the Series A
Preferred Stock. The redemption price and liquidation preference for the
Series C Preferred Stock is $21.00 per share, plus any accrued and unpaid
dividends. With respect to redemption and liquidation preferences, the rights
of the holders of the Series C Preferred Stock are in parity with the Series B
Preferred Stock.
 
  In August 1997, the Company issued 292,995 shares of its Senior Convertible
Preferred Stock (the "Senior Preferred Stock") at a price of $100 per share.
The net proceeds received by the Company from the sale of such shares amounted
to approximately $29,266,000. Of this amount, $25,882,000 was used to pay the
cash portion of the purchase price for Crown (see Note 2).
 
  The holders of the Senior Preferred Stock are entitled to receive cumulative
dividends at the rate of 12.5% per share, compounded annually. At September
30, 1997, such accrued and unpaid dividends amounted to $461,000, or
approximately $1.58 per share. At the option of the holder, each share of
Senior Preferred Stock (plus any accrued and unpaid dividends) is convertible,
at any time, into shares of the Company's Class B Common Stock at a conversion
price of $37.54 (subject to adjustment in the event of an underwritten public
offering of the Company's common stock). At the date of issuance of the Senior
Preferred Stock, the Company believes that its conversion price represents the
estimated fair value of the Class B Common Stock on that date. The holders of
the Senior Preferred Stock are entitled to vote together with the holders of
the Company's other preferred stock on an as-converted basis.
 
  The Company has the one-time right, within one year from the date of
issuance, to redeem 50% of the outstanding shares of Senior Preferred Stock at
a price per share which represents an annualized cumulative rate of return of
18%. If not earlier converted or redeemed, the shares of Senior Preferred
Stock are subject to mandatory redemption by the Company, at a price per share
of $100 plus any accrued and unpaid dividends through that date, upon the
earlier of (i) 91 days after the tenth anniversary date of a proposed issuance
of underwritten debt securities (see Note 7); or (ii) May 15, 2008. The Senior
Preferred Stock also calls for a preference, in the event of a liquidation or
a change in voting control, equal to a price per share which represents an
annualized cumulative rate of return of 18%. With respect to dividend,
redemption and liquidation preferences, the rights of the holders of the
Senior Preferred Stock are senior to the Company's other preferred and common
stock.
 
                                     F-11
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
       CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
  The purchasers of the Senior Preferred Stock were also issued warrants to
purchase an aggregate 117,198 shares of the Company's Class B Common Stock at
an exercise price of $37.54 per share (subject to adjustment in the event of
an underwritten public offering of the Company's common stock). The warrants
are exercisable, in whole or in part, at any time until August of 2007. At the
date of issuance of the warrants, the Company believes that the exercise price
represents the estimated fair value of the Class B Common Stock on that date.
As such, the Company has not assigned any value to the warrants in its
consolidated financial statements.
 
6. STOCKHOLDERS' EQUITY (DEFICIT)
 
  In March 1997, the Company repurchased, and subsequently retired, 162,958
shares of its common stock from a member of the Company's Board of Directors
at a cost of approximately $3,422,000. Of this amount, $1,311,000 was recorded
as compensation cost and is included in corporate development expense on the
Company's consolidated statement of operations.
 
7. SUBSEQUENT EVENTS
 
  In October 1997, the Company issued an additional 364,500 shares of its
Senior Preferred Stock at a price of $100 per share (see Note 5). The net
proceeds received by the Company from the sale of such shares amounted to
$36,450,000. The purchasers of these additional shares of Senior Preferred
Stock were also issued warrants to purchase an aggregate 145,800 shares of the
Company's Class B Common Stock at an exercise price of $37.54 per share
(subject to adjustment in the event of an underwritten public offering of the
Company's common stock). The warrants are exercisable, in whole or in part, at
any time until October of 2007.
 
  In October 1997, the Company amended the terms of the Series A Preferred
Stock, the Series B Preferred Stock and the Series C Preferred Stock such that
the optional redemption rights of the holders cannot be exercised until the
earlier of (i) 91 days after the tenth anniversary date of a proposed issuance
of underwritten debt securities (as discussed below); or (ii) May 15, 2008.
 
  In October 1997, CTC's Bank Credit Agreement was amended to (i) increase the
available borrowings to $100,000,000; (ii) include the lending bank under the
Crown Bank Credit Agreement as a participating lender; and (iii) extend the
maturity date to December 31, 2004. On October 31, 1997, additional borrowings
under this amended Bank Credit Agreement, along with the proceeds from the
October issuance of Senior Preferred Stock (as discussed above), were used to
repay (i) the Promissory Note payable to the former stockholders of Crown and
(ii) the outstanding borrowings under the Crown Bank Credit Agreement (see
Notes 2 and 4). The Company intends to repay the outstanding borrowings under
the Bank Credit Agreement with the proceeds from an issuance of underwritten
debt securities. There can be no assurance, however, that such an issuance of
securities can be successfully completed.
 
8. CONTINGENCIES
 
  The Company is involved in various claims, lawsuits and proceedings arising
in the ordinary course of business. While there are uncertainties inherent in
the ultimate outcome of such matters and it is impossible to presently
determine the ultimate costs that may be incurred, management believes the
resolution of such uncertainties and the incurrence of such costs should not
have a material adverse effect on the Company's consolidated financial
position or results of operations.
 
                                     F-12
<PAGE>
 
                         INDEPENDENT AUDITORS' REPORT
 
To the Board of Directors and Stockholders of
 Crown Castle International Corp.:
 
  We have audited the accompanying consolidated balance sheets of Crown Castle
International Corp. and subsidiaries (formerly Castle Tower Holding Corp.) as
of December 31, 1995 and 1996, and the related consolidated statements of
operations, cash flows and stockholders' equity for the years then ended.
These consolidated financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
consolidated financial statements based on our audits.
 
  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.
 
  In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the financial position of Crown
Castle International Corp. and subsidiaries (formerly Castle Tower Holding
Corp.) as of December 31, 1995 and 1996, and the results of their operations
and their cash flows for the years then ended in conformity with generally
accepted accounting principles.
 
                                          KPMG Peat Marwick LLP
 
Houston, Texas
March 19, 1997
 
                                     F-13
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
                           CONSOLIDATED BALANCE SHEET
 
                (IN THOUSANDS OF DOLLARS, EXCEPT SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                               DECEMBER 31,
                                                              ----------------
                                                               1995     1996
                           ASSETS                             -------  -------
<S>                                                           <C>      <C>
Current assets:
  Cash and cash equivalents.................................. $   596  $ 7,343
  Receivables:
   Trade, net of allowance for doubtful accounts of $10 and
    $32 at December 31, 1995 and 1996, respectively..........     226      840
   Other.....................................................      --    1,081
  Prepaid land leases........................................      71       55
  Prepaid expenses and other current assets..................      40       94
                                                              -------  -------
    Total current assets.....................................     933    9,413
Property and equipment, net..................................  16,003   26,753
Investment in and advances to affiliates.....................      --    2,101
Restricted cash..............................................   1,500    1,500
Other assets, net............................................   1,439    1,459
                                                              -------  -------
                                                              $19,875  $41,226
                                                              =======  =======
<CAPTION>
       LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
<S>                                                           <C>      <C>
Current liabilities:
  Accounts payable and accrued liabilities................... $   638  $ 1,048
  Accrued interest...........................................     134       49
  Accrued taxes, other than on income........................     193      183
  Deferred rental revenues...................................      96      325
  Long-term debt, current maturities.........................     130      140
                                                              -------  -------
    Total current liabilities................................   1,191    1,745
Accrued interest.............................................     338      729
Long-term debt, less current maturities......................  11,052   21,912
Site rental deposits.........................................   1,500    1,500
                                                              -------  -------
    Total liabilities........................................  14,081   25,886
                                                              -------  -------
Commitments
Redeemable preferred stock, $.01 par value; 2,500,000 shares
 authorized:
  Series A Convertible Preferred Stock; 862,455 shares issued
   (stated at redemption and aggregate liquidation value)....   5,175    5,175
  Series B Convertible Preferred Stock; shares issued:
   December 31, 1995 -- none and December 31, 1996 -- 864,568
   (stated at redemption and aggregate liquidation value)....      --   10,375
                                                              -------  -------
    Total redeemable preferred stock.........................   5,175   15,550
                                                              -------  -------
Stockholders' equity (deficit):
  Common stock, $.01 par value; 5,270,000 shares authorized:
   Class A Common Stock; 270,000 shares issued...............       3        3
   Class B Common Stock; shares issued: December 31, 1995 --
    286,666 and December 31, 1996 -- 297,666 ................       3        3
  Additional paid-in capital.................................     634      762
  Accumulated deficit........................................     (21)    (978)
                                                              -------  -------
    Total stockholders' equity (deficit) ....................     619     (210)
                                                              -------  -------
                                                              $19,875  $41,226
                                                              =======  =======
</TABLE>
                See notes to consolidated financial statements.
 
                                      F-14
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
                      CONSOLIDATED STATEMENT OF OPERATIONS
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                                YEARS ENDED
                                                               DECEMBER 31,
                                                              ----------------
                                                               1995     1996
                                                              -------  -------
<S>                                                           <C>      <C>
Net revenues:
  Site rental................................................ $ 4,052  $ 5,615
  Network services and other.................................       6      592
                                                              -------  -------
                                                                4,058    6,207
                                                              -------  -------
Operating expenses:
  Costs of operations (exclusive of depreciation and
   amortization):
   Site rental...............................................   1,226    1,292
   Network services and other................................      --        8
  General and administrative.................................     729    1,678
  Corporate development......................................     204    1,324
  Depreciation and amortization..............................     836    1,242
                                                              -------  -------
                                                                2,995    5,544
                                                              -------  -------
Operating income.............................................   1,063      663
Other income (expense):
  Interest and other income..................................      53      193
  Interest expense and amortization of deferred financing
   costs.....................................................  (1,137)  (1,803)
                                                              -------  -------
Loss before income taxes.....................................     (21)    (947)
Provision for income taxes...................................      --      (10)
                                                              -------  -------
Net loss..................................................... $   (21) $  (957)
                                                              =======  =======
</TABLE>
 
 
                See notes to consolidated financial statements.
 
                                      F-15
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
                      CONSOLIDATED STATEMENT OF CASH FLOWS
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                                YEARS ENDED
                                                               DECEMBER 31,
                                                              ----------------
                                                               1995     1996
                                                              -------  -------
<S>                                                           <C>      <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
 Net loss.................................................... $   (21) $  (957)
 Adjustments to reconcile net loss to net cash provided by
  (used for) operating activities:
  Depreciation and amortization..............................     836    1,242
  Amortization of deferred financing costs...................      36       55
  Changes in assets and liabilities, excluding the effects of
   acquisitions:
   Increase in accounts payable and accrued liabilities......     406      323
   Increase in accrued interest..............................     472      306
   Increase in deferred rental revenues......................      39      229
   Increase in receivables...................................    (226)  (1,695)
   Increase in prepaid expenses and other assets.............     (63)     (23)
   Increase (decrease) in accrued taxes......................     193      (10)
                                                              -------  -------
    Net cash provided by (used for) operating activities.....   1,672     (530)
                                                              -------  -------
CASH FLOWS FROM INVESTING ACTIVITIES:
 Acquisitions of net assets.................................. (16,512) (10,925)
 Investment in and advances to affiliates....................      --   (2,101)
 Capital expenditures........................................    (161)    (890)
                                                              -------  -------
    Net cash used for investing activities................... (16,673) (13,916)
                                                              -------  -------
CASH FLOWS FROM FINANCING ACTIVITIES:
 Net borrowings under revolving credit agreements............   4,700   11,000
 Proceeds from issuance of capital stock.....................   5,072   10,503
 Incurrence of financing costs...............................    (343)    (180)
 Principal payments on long-term debt........................      --     (130)
 Proceeds from issuance of long-term debt....................   6,168       --
                                                              -------  -------
    Net cash provided by financing activities................  15,597   21,193
                                                              -------  -------
NET INCREASE IN CASH AND CASH EQUIVALENTS....................     596    6,747
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR...............      --      596
                                                              -------  -------
CASH AND CASH EQUIVALENTS AT END OF YEAR..................... $   596  $ 7,343
                                                              =======  =======
SUPPLEMENTARY SCHEDULE OF NON-CASH INVESTING AND FINANCING
 ACTIVITIES:
 Conversion of stockholder's Convertible Secured Subordinated
  Notes to Series A Convertible Preferred Stock.............. $   743  $    --
 Amounts recorded in connection with acquisitions (see Note
  2):
  Fair value of net assets acquired, including goodwill......  17,801   10,958
  Issuance of long-term debt.................................     762       --
  Assumption of long-term debt...............................     295       --
  Amounts due to seller......................................     232       33
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
 Interest paid............................................... $   628  $ 1,442
 Income taxes paid...........................................      --       --
</TABLE>
 
                See notes to consolidated financial statements.
 
                                      F-16
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
            CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (DEFICIT)
 
                (IN THOUSANDS OF DOLLARS, EXCEPT SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                              CLASS A            CLASS B
                            COMMON STOCK       COMMON STOCK    ADDITIONAL
                         ------------------ ------------------  PAID-IN   ACCUMULATED
                         SHARES  ($.01 PAR) SHARES  ($.01 PAR)  CAPITAL     DEFICIT   TOTAL
                         ------- ---------- ------- ---------- ---------- ----------- -----
<S>                      <C>     <C>        <C>     <C>        <C>        <C>         <C>
Balance, January 1,
 1995...................      --    $ --         --    $ --       $ --       $  --    $  --
 Issuances of capital
  stock................. 270,000       3    286,666       3        634          --      640
 Net loss...............      --      --         --      --         --         (21)     (21)
                         -------    ----    -------    ----       ----       -----    -----
Balance, December 31,
 1995................... 270,000       3    286,666       3        634         (21)     619
 Issuances of capital
  stock.................      --      --     11,000      --        128          --      128
 Net loss...............      --      --         --      --         --        (957)    (957)
                         -------    ----    -------    ----       ----       -----    -----
Balance, December 31,
 1996................... 270,000    $  3    297,666    $  3       $762       $(978)   $(210)
                         =======    ====    =======    ====       ====       =====    =====
</TABLE>
 
 
 
                See notes to consolidated financial statements.
 
                                      F-17
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1. BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
 BASIS OF PRESENTATION
 
  The consolidated financial statements include the accounts of Crown Castle
International Corp. (formerly Castle Tower Holding Corp.) and its wholly owned
subsidiaries, collectively referred to herein as the "Company." All
significant intercompany balances and transactions have been eliminated in
consolidation. Certain reclassifications have been made to the prior year's
financial statements to be consistent with the presentation in the current
year.
 
  The Company (a Delaware corporation) was organized on April 20, 1995. On
April 27, 1995, the stockholders of Castle Tower Corporation ("CTC")
contributed all of the outstanding shares of CTC's stock to the Company in
exchange for shares of the Company's stock. CTC (a Delaware corporation,
formerly Castle Communications Corporation) was organized on December 21, 1994
and began operations on January 1, 1995. The Company and CTC have treated this
exchange of securities as a reorganization of entities under common control.
As such, the transaction has been accounted for as if it were a pooling of
interests on January 1, 1995.
 
  The Company provides infrastructure services to the wireless
telecommunications and broadcasting industries through the development and
rental of its towers and the management of building rooftop antenna sites.
These telecommunications sites are located throughout the United States and in
Puerto Rico. In addition, the Company provides specialized mobile radio and
microwave services in Puerto Rico.
 
  The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities, the
disclosure of contingent assets and liabilities as of the date of the
financial statements, and the reported amounts of revenues and expenses during
the reporting period. Actual results could differ from those estimates.
 
 SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Cash Equivalents
 
  Cash equivalents consist of highly liquid investments with original
maturities of three months or less.
 
  Property and Equipment
 
  Property and equipment is stated at cost, net of accumulated depreciation.
Depreciation is computed utilizing the straight-line method at rates based
upon the estimated useful lives of the various classes of assets. Additions,
renewals and improvements are capitalized, while maintenance and repairs are
expensed. Upon the sale or retirement of an asset, the related cost and
accumulated depreciation are removed from the accounts and any gain or loss is
recognized.
 
  In March 1995, the Financial Accounting Standards Board (the "FASB") issued
Statement of Financial Accounting Standards No. 121, Accounting for the
Impairment of Long-Lived Assets and for Long-Lived Assets to Be Disposed Of
("SFAS 121"). SFAS 121 requires that long-lived assets and certain
identifiable intangibles be reviewed for impairment whenever events or changes
in circumstances indicate that the carrying amount of an asset may not be
recoverable. SFAS 121 is effective for fiscal years beginning after December
15, 1995. The adoption of SFAS 121 by the Company in 1996 did not have a
material impact on its consolidated financial statements.
 
  Other Assets
 
  Included in other assets are goodwill, deferred financing costs and a
noncompete agreement. Goodwill represents the excess of the purchase price for
an acquired business over the allocated value of the related net
 
                                     F-18
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
assets (see Note 2). Goodwill is amortized on a straight-line basis over a
twenty year life. The carrying value of goodwill and other intangible assets
will be reviewed for impairment whenever events or changes in circumstances
indicate that the carrying amount of the acquired assets may not be
recoverable. If the sum of the estimated future cash flows (undiscounted)
expected to result from the use and eventual disposition of an asset is less
than the carrying amount of the asset, an impairment loss is recognized.
Measurement of an impairment loss is based on the fair value of the asset.
 
  Deferred financing costs are amortized over the estimated term of the
related borrowing. The noncompete agreement is amortized over the term of the
agreement.
 
 Revenue Recognition
 
  Rental and service revenues are recognized as the services are performed,
generally on a monthly basis under lease or management agreements with terms
ranging from 12 months to 25 years.
 
 Corporate Development Expenses
 
  Corporate development expenses represent costs incurred in connection with
acquisitions and development of new business initiatives.
 
 Income Taxes
 
  The Company accounts for income taxes using an asset and liability approach,
which requires the recognition of deferred income tax assets and liabilities
for the expected future tax consequences of events that have been recognized
in the Company's financial statements or tax returns. Deferred income tax
assets and liabilities are determined based on the temporary differences
between the financial statement and tax bases of assets and liabilities using
enacted tax rates.
 
 Financial Instruments
 
  The carrying amounts of cash and cash equivalents and restricted cash
approximate fair value for these instruments. The estimated fair value of the
Convertible Secured Subordinated Notes is based on the most recent price at
which shares of the Company's stock were sold (see Note 6). The estimated fair
value of the other long-term debt is determined based on the current rates
offered for similar borrowings. The estimated fair values of the Company's
financial instruments, along with the carrying amounts of the related assets
(liabilities), are as follows:
 
<TABLE>
<CAPTION>
                                         DECEMBER 31, 1995   DECEMBER 31, 1996
                                         ------------------  ------------------
                                         CARRYING    FAIR    CARRYING    FAIR
                                          AMOUNT    VALUE     AMOUNT    VALUE
                                         --------  --------  --------  --------
                                              (IN THOUSANDS OF DOLLARS)
   <S>                                   <C>       <C>       <C>       <C>
   Cash and cash equivalents............ $    596  $    596  $  7,343  $  7,343
   Restricted cash......................    1,500     1,500     1,500     1,500
   Long-term debt.......................  (11,182)  (11,797)  (22,052)  (25,736)
</TABLE>
 
  In January 1997, the Company entered into an interest rate swap agreement in
order to manage interest rate risk. The net settlement amount resulting from
this agreement is recognized as an adjustment to interest expense. The Company
does not hold or issue derivative financial instruments for trading purposes.
 
 
                                     F-19
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 Stock Options
 
  In October 1995, the FASB issued Statement of Financial Accounting Standards
No. 123, Accounting for Stock-Based Compensation ("SFAS 123"). SFAS 123
establishes alternative methods of accounting and disclosure for employee
stock-based compensation arrangements. The Company has elected to continue the
use of the "intrinsic value based method" of accounting for its employee stock
option plan (see Note 9). This method does not result in the recognition of
compensation expense when employee stock options are granted if the exercise
price of the options equals or exceeds the fair market value of the stock at
the date of grant. See Note 9 for the disclosures required by SFAS 123.
 
 Recent Accounting Pronouncements
 
  In February 1997, the FASB issued Statement of Financial Accounting
Standards No. 128, Earnings per Share ("SFAS 128"). SFAS 128 establishes new
standards for computing and presenting earnings per share ("EPS") amounts for
companies with publicly held common stock or potential common stock. The new
standards require the presentation of both basic and diluted EPS amounts for
companies with complex capital structures. Basic EPS is computed by dividing
income available to common stockholders by the weighted-average number of
common shares outstanding for the period, and excludes the effect of
potentially dilutive securities (such as options, warrants and convertible
securities) which are convertible into common stock. Dilutive EPS reflects the
potential dilution from such convertible securities. SFAS 128 is effective for
periods ending after December 15, 1997. The Company will adopt the
requirements of SFAS 128 at such time as it has publicly held common stock.
 
  In February 1997, the FASB issued Statement of Financial Accounting
Standards No. 129, Disclosure of Information about Capital Structure ("SFAS
129"). SFAS 129 establishes standards for disclosing information about a
company's outstanding debt and equity securities and eliminates exemptions
from such reporting requirements for nonpublic companies. SFAS 129 is
effective for periods ending after December 15, 1997. The Company has adopted
the requirements of SFAS 129 in its financial statements for the year ended
December 31, 1996.
 
2. ACQUISITIONS
 
  During 1995 and 1996, the Company consummated a number of business
acquisitions which were accounted for using the purchase method. Results of
operations and cash flows of the acquired businesses are included in the
consolidated financial statements for the periods subsequent to the respective
dates of acquisition.
 
 Pittencrieff Communications, Inc. ("PCI")
 
  From January 9, 1995 through November 1, 1995, the Company acquired 127
telecommunications towers and related assets, net of certain outstanding
liabilities, from PCI. The total purchase price of $16,179,000 consisted of
$15,122,000 in cash, a note payable to PCI for $762,000 and the assumption of
a note payable to a third party for $295,000.
 
  The Company entered into a license agreement with PCI under which PCI leases
space on certain of the towers for its telecommunications equipment. This
license agreement commenced on January 1, 1995 and expires on December 31,
2008, at which time PCI has the option to renew the license agreement for an
additional three year term. In order to secure the payment of its monthly
license fees to the Company, PCI has deposited $1,500,000 in an escrow
account. This amount is presented as restricted cash and site rental deposits
on the Company's consolidated balance sheet.
 
                                     F-20
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
  The Company also entered into a management agreement with PCI under which
PCI managed the towers for the Company. The term of this management agreement
was for one year commencing on January 1, 1995. The Company paid a management
fee to PCI equal to 15% of the revenues generated by the towers. Such
management fees amounted to $553,000 for the year ended December 31, 1995. The
Company began managing the towers on January 1, 1996.
 
 Spectrum Engineering Company ("Spectrum")
 
  On October 30, 1995, the Company acquired substantially all of the property
and equipment of Spectrum for $1,185,000 in cash. Spectrum provides management
services for building rooftop antenna sites. The Company recognized goodwill
of $870,000 in connection with this acquisition.
 
 Motorola, Inc. ("Motorola")
 
  On June 28, 1996, the Company acquired fifteen telecommunications towers and
related assets, and assets related to specialized mobile radio and microwave
services, from Motorola in Puerto Rico. The purchase price consisted of
$9,919,000 in cash. Motorola provided certain management services related to
these assets for a period of ninety days after the closing date. Management
fees for such services amounted to $57,000 for the year ended December 31,
1996.
 
 Other Acquisitions
 
  During 1995 and 1996, the Company acquired a number of other
telecommunications towers and related equipment from various sellers. The
aggregate total purchase price for these acquisitions of $1,476,000 consisted
of $1,211,000 in cash and a $265,000 payable to a seller.
 
 Pro Forma Results of Operations (Unaudited)
 
  The following unaudited pro forma summary presents consolidated results of
operations for the Company as if (i) the Spectrum acquisition had been
consummated on January 1, 1995 and (ii) the Motorola and other acquisitions
had been consummated as of January 1 for both 1995 and 1996. Appropriate
adjustments have been reflected for depreciation and amortization, interest
expense, amortization of deferred financing costs and income taxes. The pro
forma information does not necessarily reflect the actual results that would
have been achieved, nor is it necessarily indicative of future consolidated
results for the Company.
 
<TABLE>
<CAPTION>
                                                            YEARS ENDED
                                                           DECEMBER 31,
                                                     --------------------------
                                                         1995          1996
                                                     ------------  ------------
                                                     (IN THOUSANDS OF DOLLARS)
<S>                                                  <C>           <C>
Net revenues........................................ $      6,781  $      7,361
Net loss............................................         (537)         (970)
</TABLE>
 
                                     F-21
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
3. PROPERTY AND EQUIPMENT
 
  The major classes of property and equipment are as follows:
 
<TABLE>
<CAPTION>
                                                         DECEMBER 31,
                                       ESTIMATED   --------------------------
                                      USEFUL LIVES     1995          1996
                                      ------------ ------------  ------------
                                                   (IN THOUSANDS OF DOLLARS)
   <S>                                <C>          <C>           <C>
   Land..............................              $        105  $        125
   Telecommunications towers and
    related equipment................  5-20 years        16,582        24,295
   Telecommunications equipment......    20 years            --         3,690
   Office furniture and equipment....     5 years           134           612
                                                   ------------  ------------
                                                         16,821        28,722
   Less: accumulated depreciation....                      (818)       (1,969)
                                                   ------------  ------------
                                                   $     16,003  $     26,753
                                                   ============  ============
</TABLE>
 
  Depreciation expense for the years ended December 31, 1995 and 1996 was
$818,000 and $1,151,000, respectively. Accumulated depreciation on
telecommunications towers and related equipment was $812,000 and $1,820,000 at
December 31, 1995 and 1996, respectively. At December 31, 1996, minimum
rentals receivable under existing operating leases for towers are as follows:
years ending December 31, 1997--$4,271,000; 1998--$3,688,000; 1999--
$3,273,000; 2000--$2,985,000; 2001--$2,790,000; thereafter--$609,000.
 
4. INVESTMENT IN AND ADVANCES TO AFFILIATES
 
  In July 1996, the Company made a non-refundable payment of $2,000,000 for an
option to acquire various ownership interests in TEA Group Incorporated,
TeleStructures, Inc. and TeleShare, Inc. (collectively, "TEA"). TEA provides
telecommunications site acquisition, design and development services. The
negotiations of the final purchase price and ownership percentages are
expected to be completed in May 1997.
 
  In November 1996, the Company advanced $100,000 to Visual Intelligence
Systems, Inc. ("VISI"). VISI intends to provide computerized geographic
information for a variety of business applications, including the acquisition
and design of telecommunications sites. The Company is considering a possible
investment in VISI. Such investment could be in the form of equity or debt
securities or some combination thereof.
 
5. OTHER ASSETS
 
  Other assets consist of the following:
 
<TABLE>
<CAPTION>
                                                          DECEMBER 31,
                                        ESTIMATED   --------------------------
                                       USEFUL LIVES     1995          1996
                                       ------------ ------------  ------------
                                                    (IN THOUSANDS OF DOLLARS)
   <S>                                 <C>          <C>           <C>
   Goodwill...........................   20 years   $        870  $        867
   Deferred financing costs...........  6-7 years            343           523
   Noncompete agreement...............    5 years            265           265
   Other..............................                        15             4
                                                    ------------  ------------
                                                           1,493         1,659
   Less: accumulated amortization.....                       (54)         (200)
                                                    ------------  ------------
                                                    $      1,439  $      1,459
                                                    ============  ============
</TABLE>
 
                                     F-22
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
6. LONG-TERM DEBT
 
  Long-term debt consists of the following:
 
<TABLE>
<CAPTION>
                                                 DECEMBER 31,
                                           --------------------------
                                               1995          1996
                                           ------------  ------------
                                           (IN THOUSANDS OF DOLLARS)
   <S>                                     <C>           <C>          
   Bank Credit Agreement:
     Revolving Credit Facility............ $      4,700  $     15,700
     Term Note............................        2,300         2,300
   Promissory Note payable to PCI.........          762           632
   Promissory Note payable for tower
    site..................................          295           295
   Convertible Secured Subordinated Notes
    payable to stockholder................        3,125         3,125
                                           ------------  ------------
                                                 11,182        22,052
   Less: current maturities...............         (130)         (140)
                                           ------------  ------------
                                           $     11,052  $     21,912
                                           ============  ============
</TABLE>
 
  Bank Credit Agreement
 
  On April 26, 1995, CTC entered into a credit agreement with a bank (as
amended, the "Bank Credit Agreement"). The Bank Credit Agreement consisted of
secured revolving lines of credit (the "Reducing Commitment" and the "Working
Capital Commitment," collectively referred to as the "Revolving Credit
Facility") and a $2,300,000 term note (the "Term Note"). On January 17, 1997,
the Bank Credit Agreement was amended to: (i) increase the available
borrowings under the Reducing Commitment to $49,000,000; (ii) repay the Term
Note, along with accrued interest thereon, with borrowings under the Reducing
Commitment; and (iii) extend the termination date for the Bank Credit
Agreement to December 31, 2003. Available borrowings under the Reducing
Commitment will generally be used to construct new towers and to finance a
portion of the purchase price for towers and related assets. The portion of
such purchase price which may be borrowed is based on the current financial
performance (as defined) of: (i) the assets to be acquired; and (ii) assets
acquired in previous acquisitions. In addition, up to $5,000,000 of borrowing
availability under the Reducing Commitment may be used for letters of credit
until December 31, 1998. There were no letters of credit outstanding at
December 31, 1996. The Working Capital Commitment provides for borrowings of
up to $1,000,000 for working capital purposes.
 
  On December 31, 1998, the amount of available borrowings under the Reducing
Commitment will decrease to the amount of borrowings actually outstanding on
that date. The Reducing Commitment will then continue to decrease by a stated
percentage at the end of each subsequent quarter until December 31, 2003, at
which time any remaining borrowings under the Reducing Commitment or the
Working Capital Commitment must be repaid. Under certain circumstances, CTC
may be required to make principal prepayments under the Reducing Commitment in
an amount equal to 50% of excess cash flow (as defined) or the amount of net
cash proceeds from certain asset sales.
 
  The Bank Credit Agreement is secured by substantially all of CTC's property
and equipment and the restricted cash, the Company's pledge of the capital
stock of CTC and its subsidiaries and a pledge of the Convertible Secured
Subordinated Notes by the stockholder. In addition, the Bank Credit Agreement
is guaranteed by the Company. As of January 17, 1997, borrowings under the
Bank Credit Agreement bear interest at a rate per annum, at CTC's election,
equal to the bank's prime rate plus 1.5% or a Eurodollar interbank offered
rate (LIBOR) plus 3.0% (9.5% and 8.19%, respectively, at January 17, 1997).
The interest rate margins may be reduced by up to 1.25% (non-cumulatively)
based on a financial test, determined quarterly. As of January 17,
 
                                     F-23
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
1997, the financial test permitted a reduction of 0.25% in the interest rate
margins. Interest on prime rate loans is due quarterly, while interest on
LIBOR loans is due at the end of the period (from one to three months) for
which such LIBOR rate is in effect. The Term Note called for quarterly
interest payments at 10% per annum, with additional interest to be accrued at
6% per annum (compounded annually) and paid in full at maturity. The Bank
Credit Agreement requires CTC to maintain certain financial covenants and
places restrictions on CTC's ability to, among other things, incur debt and
liens, pay dividends, make capital expenditures, undertake transactions with
affiliates and make investments.
 
  Promissory Note Payable to PCI
 
  This note matures on January 10, 2000, bears interest at a rate of 8% per
annum, calls for equal annual payments of principal and interest and is
secured by the tower sites purchased from PCI.
 
  Promissory Note Payable for Tower Site
 
  This note matures in 2004, bears interest at a rate of 10% per annum, calls
for monthly payments of principal and interest and is secured by an individual
towers purchased from PCI.
 
  Convertible Secured Subordinated Notes Payable to Stockholder (the
"Convertible Notes")
 
  These notes were scheduled to mature on January 11, 1998, accrued interest
at a rate of 8% per annum payable at maturity, and were secured by
substantially all of CTC's assets. The notes provided that the holder had the
option, at any time, to convert such notes, in whole or in part, into shares
of the Company's Series A Convertible Preferred Stock at a conversion price of
$6.00 per share. On April 27, 1995, a portion of the notes with aggregate
principal balances of $743,000 was converted into 123,742 shares of the
Company's stock and the related accrued interest was paid to the holder. On
February 24, 1997, the remaining $3,125,000 principal amount of the notes was
converted into 520,878 shares of the Company's stock and, by mutual agreement
with the holder, the related accrued interest was forfeited. Upon conversion
of the notes, the principal amount and the forfeited interest are accounted
for as an increase to redeemable preferred stock.
 
  Maturities
 
  Scheduled maturities of long-term debt outstanding as of December 31, 1996,
excluding the Convertible Notes, are as follows: years ending December 31,
1997--$140,000; 1998--$153,000; 1999--$2,985,000; 2000--$3,112,000; 2001--
$3,207,000; thereafter--$9,330,000. The scheduled maturities for the Term Note
are presented in accordance with the repayment provisions of the Reducing
Commitment borrowings, since such borrowings were used to repay the Term Note
in January 1997.
 
  Restricted Net Assets of Subsidiary
 
  CTC is precluded from paying dividends to the Company by the terms of the
Bank Credit Agreement. The restricted net assets of CTC totaled $5,766,000 at
December 31, 1996.
 
  Interest Rate Swap Agreement
 
  The interest rate swap agreement has an outstanding notional amount of
$17,925,000 at January 29, 1997 (inception) and terminates on February 24,
1999. The Company pays a fixed rate of 6.28% on the notional amount and
receives a floating rate based on LIBOR. This agreement effectively changes
the interest rate on $17,925,000 of borrowings under the Reducing Commitment
from a floating rate to a fixed rate of 6.28% plus the applicable margin. The
Company does not believe there is any significant exposure to credit risk due
to the
 
                                     F-24
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
creditworthiness of the counterparty. In the event of nonperformance by the
counterparty, the Company's loss would be limited to any unfavorable interest
rate differential.
 
7. INCOME TAXES
 
  The provision for income taxes consists of the following:
 
<TABLE>
<CAPTION>
                                                      YEARS ENDED DECEMBER 31,
                                                      ------------------------
                                                          1995          1996
                                                      ------------  ------------
                                                      (IN THOUSANDS OF DOLLARS)
   <S>                                                <C>           <C>
   Current:
     Puerto Rico..................................... $         --  $         10
                                                      ============  ============
</TABLE>
 
  A reconciliation between the provision for income taxes and the amount
computed by applying the federal statutory income tax rate to the loss before
income taxes is as follows:
 
<TABLE>
<CAPTION>
                                                    YEARS ENDED DECEMBER 31,
                                                    ------------------------
                                                       1995          1996
                                                   ------------  -------------
                                                   (IN THOUSANDS OF DOLLARS)
   <S>                                             <C>           <C>
   Benefit for income taxes at statutory rate..... $        (7)  $        (322)
   Puerto Rico taxes..............................          --              10
   Expenses for which no federal tax benefit was
    recognized....................................           5               5
   Changes in valuation allowances................           2             315
   Other..........................................          --               2
                                                   -----------   -------------
                                                   $        --   $          10
                                                   ===========   =============
</TABLE>
 
  The components of the net deferred income tax assets and liabilities are as
follows:
 
<TABLE>
<CAPTION>
                                                            DECEMBER 31
                                                     --------------------------
                                                        1995          1996
                                                     ------------ -------------
                                                     (IN THOUSANDS OF DOLLARS)
   <S>                                               <C>          <C>
   Deferred income tax liabilities:
     Property and equipment......................... $       467  $       1,307
     Intangible assets..............................          24             49
                                                     -----------  -------------
       Total deferred income tax liabilities........         491          1,356
                                                     -----------  -------------
   Deferred income tax assets:
     Net operating loss carryforwards...............         486          1,639
     Noncompete agreement...........................           3             19
     Receivables allowance..........................           4             15
     Valuation allowances...........................          (2)          (317)
                                                     -----------  -------------
       Total deferred income tax assets, net........         491          1,356
                                                     -----------  -------------
   Net deferred income tax liabilities.............. $        --  $          --
                                                     ===========  =============
</TABLE>
 
  Valuation allowances of $2,000 and $317,000 were recognized to offset net
deferred income tax assets as of December 31, 1995 and 1996, respectively.
 
  At December 31, 1996, the Company has net operating loss carryforwards of
approximately $4,800,000 which are available to offset future federal taxable
income. These loss carryforwards will expire in 2010 through 2011. The
utilization of the loss carryforwards is subject to certain limitations.
 
                                     F-25
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
8. REDEEMABLE PREFERRED STOCK
 
  The holders of the Company's Series A Convertible Preferred Stock (the
"Series A Preferred Stock") and the Series B Convertible Preferred Stock (the
"Series B Preferred Stock") (collectively, the "Preferred Stock") are
generally entitled to one vote per share on all matters presented to a vote of
the Company's stockholders. The holders of the Preferred Stock are also
entitled to receive dividends, if and when declared, at the same rate as
dividends are declared and paid with respect to the Company's common stock. At
the option of the holder, each share of Preferred Stock is convertible, at any
time, into one share of the Company's Class B Common Stock. The outstanding
shares of Preferred Stock will automatically convert into an equal number of
shares of Class B Common Stock in the event of an underwritten public offering
of the Company's common stock, subject to certain conditions.
 
  On or after December 31, 2001, the outstanding shares of Series A Preferred
Stock and Series B Preferred Stock are redeemable, at the option of the
holder, at a price per share of $6.00 and $12.00, respectively, plus any
accrued and unpaid dividends through the date of redemption. The Series A
Preferred Stock and Series B Preferred Stock also call for liquidation
preferences equal to such respective redemption prices. With respect to
redemption and liquidation preferences, the rights of the holders of the
Series B Preferred Stock are senior to the Series A Preferred Stock and the
common stock, and the rights of the holders of the Series A Preferred Stock
are senior to the common stock.
 
9. STOCKHOLDERS' EQUITY (DEFICIT)
 
  Common Stock
 
  At the option of the holder, each share of the Company's Class A Common
Stock is convertible, at any time, into 1.52315 shares of the Company's Class
B Common Stock. The holders of the Class B Common Stock are entitled to one
vote per share on all matters presented to a vote of the Company's
stockholders, and the holders of the Class A Common Stock are entitled to a
number of votes equivalent to the number of shares of Class B Common Stock
into which their shares of Class A Common Stock are convertible. The holders
of the Class A Common Stock are also entitled to receive dividends, if and
when declared, on an equivalent basis with the holders of the Class B Common
Stock. In the event of an underwritten public offering of its common stock
which results in the conversion of the Preferred Stock (see Note 8), the
Company may, at its option, require that all outstanding shares of Class A
Common Stock be converted into Class B Common Stock.
 
  Stock Options
 
  In 1995, the Company adopted the Crown Castle International Corp. 1995 Stock
Option Plan (as amended, the "1995 Stock Option Plan"). Up to 300,000 shares
of the Company's Class B Common Stock are reserved for awards granted to
certain employees, consultants and non-employee directors of the Company and
its subsidiaries or affiliates. These options generally vest over periods of
up to five years from the date of grant (as determined by the Company's Board
of Directors) and have a maximum term of ten years from the date of grant. A
summary of awards granted under the 1995 Stock Option Plan is as follows for
the years ended December 31, 1995 and 1996:
 
<TABLE>
<CAPTION>
                                      1995                     1996
                            ------------------------ ------------------------
                                        WEIGHTED-                WEIGHTED-
                            NUMBER OF    AVERAGE     NUMBER OF    AVERAGE
                             SHARES   EXERCISE PRICE  SHARES   EXERCISE PRICE
                            --------- -------------- --------- --------------
   <S>                      <C>       <C>            <C>       <C>
   Options outstanding at
    beginning of year......       --                  165,000      $2.65
   Options granted.........  165,000      $2.65        45,000      11.11
                             -------                  -------
   Options outstanding at
    end of year............  165,000       2.65       210,000       4.47
                             =======                  =======
   Options exercisable at
    end of year............       --                  144,250      $2.17
                             =======                  =======
</TABLE>
 
 
                                     F-26
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
  In November 1996, options which were granted in 1995 for the purchase of
138,000 shares were modified such that those options became fully vested. A
summary of options outstanding as of December 31, 1996 is as follows:
 
<TABLE>
<CAPTION>
                                                      WEIGHTED-
                                                       AVERAGE
                          NUMBER OF                   REMAINING                   NUMBER OF
      EXERCISE             OPTIONS                   CONTRACTUAL                   OPTIONS
       PRICE             OUTSTANDING                    LIFE                     EXERCISABLE
      --------           -----------                 -----------                 -----------
      <S>                <C>                         <C>                         <C>
      $ 2.00               138,000                    9.0 years                    138,000
        6.00                27,000                    8.9 years                      6,250
        8.00                10,000                    9.4 years                         --
       12.00                35,000                    9.8 years                         --
                           -------                                                 -------
                           210,000                    9.1 years                    144,250
                           =======                                                 =======
</TABLE>
 
  The weighted-average fair value of options granted during the years ended
December 31, 1995 and 1996 was $2.48 and $0.43, respectively. The fair value
of each option was estimated on the date of grant using the Black-Scholes
option-pricing model and the following weighted-average assumptions about the
options (the minimum value method):
 
<TABLE>
<CAPTION>
                                                       YEARS ENDED DECEMBER 31,
                                                       -------------------------
                                                           1995         1996
                                                       ------------ ------------
   <S>                                                 <C>          <C>
   Risk-free interest rate............................         5.3%         6.4%
   Expected life......................................    3.2 years    4.0 years
   Expected volatility................................           0%           0%
   Expected dividend yield............................           0%           0%
</TABLE>
 
  The exercise prices for options granted during the years ended December 31,
1995 and 1996 were equal to or in excess of the estimated fair value of the
Company's Class B Common Stock at the date of grant. As such, no compensation
cost was recognized for stock options during those years (see Note 1). If
compensation cost had been recognized for stock options based on their fair
value at the date of grant, the Company's pro forma net loss for the years
ended December 31, 1995 and 1996 would have been $33,000 and $973,000,
respectively. The pro forma effect of stock options on the Company's net loss
for those years may not be representative of the pro forma effect for future
years due to the impact of vesting and potential future awards.
 
  Shares Reserved For Issuance
 
  At December 31, 1996, the Company had the following shares reserved for
future issuance:
 
<TABLE>
   <S>                                                                 <C>
   Class B Common Stock:
     Series A Preferred Stock......................................... 1,383,333
     Series B Preferred Stock.........................................   864,568
     Class A Common Stock.............................................   411,250
     1995 Stock Option Plan...........................................   300,000
                                                                       ---------
                                                                       2,959,151
                                                                       =========
   Series A Preferred Stock:
     Convertible Notes................................................   520,878
                                                                       =========
</TABLE>
 
                                     F-27
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
10. RELATED PARTY TRANSACTIONS
 
  The Company leases office space in a building owned by its President and
Chief Executive Officer. Lease payments for such office space amounted to
$22,000 and $50,000 for the years ended December 31, 1995 and 1996,
respectively.
 
  Included in other receivables at December 31, 1996 are amounts due from
employees of the Company totaling $128,000. Substantially all of these amounts
were collected in March 1997.
 
11.  COMMITMENTS
 
  At December 31, 1996, minimum rental commitments under operating leases for
land at towers are as follows: years ending December 31, 1997--$177,000;
1998--$158,000; 1999--$150,000; 2000--$111,000; 2001--$92,000; thereafter--
$815,000. Rental expense for tower site land leases was $208,000 and $277,000
for the years ended December 31, 1995 and 1996, respectively.
 
12. CONCENTRATIONS OF CREDIT RISK
 
  Financial instruments that potentially subject the Company to concentrations
of credit risk are primarily cash and cash equivalents, trade receivables and
restricted cash. The Company mitigates its risk with respect to cash and cash
equivalents and restricted cash by maintaining such deposits at high credit
quality financial institutions and monitoring the credit ratings of those
institutions.
 
  The Company derives the largest portion of its revenues from customers in
the wireless telecommunications industry. In addition, the Company has
concentrations of operations in certain geographic areas (primarily Texas, New
Mexico, Arizona and Puerto Rico). The Company mitigates its concentrations of
credit risk with respect to trade receivables by actively monitoring the
creditworthiness of its customers. Historically, the Company has not incurred
any significant credit related losses.
 
  For the years ended December 31, 1995 and 1996, the Company's revenues from
PCI amounted to $2,566,000 and $2,634,000, respectively.
 
13. SUBSEQUENT EVENTS
 
  Redeemable Preferred Stock and Stockholders' Equity
 
  In February 1997, the Company filed an amendment to its certificate of
incorporation in order to increase the number of authorized preferred and
common shares to 5,777,733 and 7,270,000, respectively. During the same month,
the Company issued 3,310,784 shares of its Series C Convertible Preferred
stock (the "Series C Preferred Stock") at a price of $21.00 per share. The net
proceeds received by the Company from the sale of the Series C Preferred Stock
amounted to approximately $69,477,000.
 
  The holders of the Series C Preferred Stock are generally entitled to the
same rights and privileges as the Series B Preferred Stock and the Series A
Preferred Stock (see Note 8). The redemption price and liquidation preference
for the Series C Preferred Stock is $21.00 per share, plus any accrued and
unpaid dividends. With respect to redemption and liquidation preferences, the
rights of the holders of the Series C Preferred Stock are in parity with the
Series B Preferred Stock.
 
  In March 1997, the Chairman of the Company's Board of Directors converted
106,988 shares of Class A Common Stock into 162,958 shares of Class B Common
Stock. The Company then repurchased these 162,958 shares of Class B Common
Stock at a cost of approximately $3,422,000.
 
 
                                     F-28
<PAGE>
 
               CROWN CASTLE INTERNATIONAL CORP. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
  Investment in Castle Transmission Services (Holdings) Ltd ("CTI")
 
  In February 1997, the Company used a portion of the net proceeds from the
sale of the Series C Preferred Stock to purchase an ownership interest of
approximately 34.45% in CTI (a company incorporated under the laws of England
and Wales). The Company led a consortium of investors which provided the
equity financing for CTI. The funds invested by the consortium were used by
CTI to purchase, through a wholly owned subsidiary, the broadcast transmission
division of the British Broadcasting Corporation (the "BBC"). The cost of the
Company's investment in CTI amounted to approximately $57,542,000. The Company
will account for its investment in CTI utilizing the equity method of
accounting.
 
  In March 1997, as compensation for leading the investment consortium, the
Company received a fee from CTI amounting to approximately $1,165,000. This
fee was recorded as revenue by the Company when received. In addition, the
Company received approximately $1,679,000 from CTI as reimbursement for costs
incurred prior to the closing of the purchase from the BBC. At December 31,
1996, approximately $953,000 of such reimbursable costs are included in other
receivables on the Company's consolidated balance sheet.
 
14. QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
 
  Summary quarterly financial information for the years ended December 31,
1995 and 1996 is as follows:
 
<TABLE>
<CAPTION>
                                                  THREE MONTHS ENDED
                                       ------------------------------------------
                                       MARCH 31 JUNE 30  SEPTEMBER 30 DECEMBER 31
                                       -------- -------  ------------ -----------
                                               (IN THOUSANDS OF DOLLARS)
<S>                                    <C>      <C>      <C>          <C>
1995:
  Net revenues........................  $  962  $  989      $  995      $1,112
  Operating income....................     263     325         251         224
  Net income (loss)...................      22      65         (62)        (46)
1996:
  Net revenues........................  $1,221  $1,238      $1,846      $1,902
  Operating income....................     306      71         196          90
  Net loss............................     (32)   (280)       (243)       (402)
</TABLE>
 
                                     F-29
<PAGE>
 
                              CROWN COMMUNICATIONS
 
                             COMBINED BALANCE SHEET
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                          DECEMBER 31, JUNE 30,
                                                              1996       1997
                         ASSETS                           ------------ --------
<S>                                                       <C>          <C>
Current assets:
  Cash and cash equivalents..............................   $   374    $   724
  Accounts receivable, net of allowance for doubtful
   accounts of $74 at
   December 31, 1996 and June 30, 1997...................     2,147      4,137
  Inventory..............................................       614      1,119
  Accrued network services...............................       653         --
  Deferred installation costs............................       154         --
  Prepaid expenses and other current assets..............       189        231
                                                            -------    -------
    Total current assets.................................     4,131      6,211
Property and equipment, net..............................    21,362     31,047
Other assets.............................................        96        105
                                                            -------    -------
                                                            $25,589    $37,363
                                                            =======    =======
<CAPTION>
             LIABILITIES AND OWNERS' EQUITY
<S>                                                       <C>          <C>
Current liabilities:
  Accounts payable.......................................   $ 2,514    $ 5,455
  Accrued expenses.......................................       833        409
  Current installments of long-term debt.................     1,447      1,525
  Customer deposits......................................       123        211
  Deferred revenue.......................................         3          3
                                                            -------    -------
    Total current liabilities............................     4,920      7,603
Long-term debt, excluding current installments...........    15,934     22,100
Note payable--owner......................................        75         75
Deferred revenue.........................................       349         65
                                                            -------    -------
    Total liabilities....................................    21,278     29,843
Commitments and contingencies (note 4)
Owners' equity:
  Common stock...........................................         7          7
  Additional paid-in capital.............................         9          9
  Owners' equity.........................................     4,295      7,504
                                                            -------    -------
    Total owners' equity.................................     4,311      7,520
                                                            -------    -------
                                                            $25,589    $37,363
                                                            =======    =======
</TABLE>
 
            See accompanying notes to combined financial statements.
 
                                      F-30
<PAGE>
 
                              CROWN COMMUNICATIONS
 
                          COMBINED STATEMENT OF INCOME
                                  (UNAUDITED)
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                                  SIX MONTHS
                                                                ENDED JUNE 30,
                                                                ---------------
                                                                 1996    1997
                                                                ------  -------
<S>                                                             <C>     <C>
Net revenues:
  Site rental.................................................. $2,239  $ 3,815
  Network services and other...................................  5,950   12,022
                                                                ------  -------
                                                                 8,189   15,837
Operating costs and expenses:
  Site rental..................................................    600    1,150
  Network services and other ..................................  3,877    5,138
  General and administrative expenses..........................  1,163    3,163
  Depreciation and amortization................................    452      842
                                                                ------  -------
                                                                 6,092   10,293
                                                                ------  -------
    Operating income...........................................  2,097    5,544
Other income (expense):
  Interest and other income (expense)..........................     (8)     (29)
  Interest expense.............................................   (526)    (774)
                                                                ------  -------
    Net income................................................. $1,563  $ 4,741
                                                                ======  =======
</TABLE>
 
 
 
            See accompanying notes to combined financial statements.
 
                                      F-31
<PAGE>
 
                              CROWN COMMUNICATIONS
 
                        COMBINED STATEMENT OF CASH FLOWS
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                             SIX MONTHS ENDED
                                                                 JUNE 30,
                                                             -----------------
                                                              1996      1997
                                                             -------  --------
<S>                                                          <C>      <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
 Net income................................................. $ 1,563  $  4,741
 Adjustments to reconcile net income to net cash provided by
  operating activities:
  Depreciation and amortization.............................     452       842
  Changes in operating assets and liabilities:
   Accounts receivable......................................  (1,951)   (1,990)
   Inventory................................................     106      (505)
   Prepaid expenses and other current assets................     (15)      (42)
   Accrued network services.................................    (437)      653
   Deferred installation costs..............................      --       374
   Other assets.............................................     (10)       --
   Accounts payable.........................................     451     2,941
   Accrued expenses.........................................     (91)     (424)
   Customer deposits........................................      (2)       88
   Deferred revenue.........................................      52      (284)
                                                             -------  --------
    Net cash provided by operating activities...............     118     6,394
                                                             -------  --------
CASH FLOWS FROM INVESTING ACTIVITIES:
 Capital expenditures.......................................  (2,378)  (10,678)
 Increase in loans receivable...............................    (800)       --
                                                             -------  --------
    Net cash used for investing activities..................  (3,178)  (10,678)
                                                             -------  --------
CASH FLOWS FROM FINANCING ACTIVITIES:
 Proceeds from issuance of notes payable....................   3,929     6,856
 Principal payments on notes payable........................    (630)     (690)
 Distributions to owners....................................    (755)   (1,532)
                                                             -------  --------
    Net cash provided by financing activities...............   2,544     4,634
                                                             -------  --------
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS........    (516)      350
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD............     764       374
                                                             -------  --------
CASH AND CASH EQUIVALENTS AT END OF PERIOD.................. $   248  $    724
                                                             =======  ========
Supplemental disclosure of cash flow information--interest
 paid....................................................... $   526  $    774
                                                             =======  ========
</TABLE>
 
 
            See accompanying notes to combined financial statements.
 
                                      F-32
<PAGE>
 
                             CROWN COMMUNICATIONS
 
               CONDENSED NOTES TO COMBINED FINANCIAL STATEMENTS
 
                           (IN THOUSANDS OF DOLLARS)
 
(1)GENERAL
 
  The information contained in the following notes to the combined financial
statements is condensed from that which would appear in the annual combined
financial statements; accordingly, the combined financial statements included
herein should be reviewed in conjunction with the combined financial
statements for the fiscal year ended December 31, 1996, and the related notes
thereto, of Crown Communications included elsewhere herein.
 
  The accompanying combined financial statements include the accounts of Crown
Communications (CCM), a sole proprietorship, Crown Network Systems, Inc.
(CNS), a subchapter S corporation, Crown Mobile Systems, Inc. (CMS), a
subchapter S corporation, Airport Communications, Inc. (ACI), a subchapter S
corporation and E-90, Ltd. (E-90), a Pennsylvania Business Trust
(collectively, Crown Communications or the Company). These entities are all
under common ownership. All significant intercompany accounts and transactions
have been eliminated.
 
  The combined financial statements included herein are unaudited; however,
they include all adjustments (consisting only of normal recurring adjustments)
which, in the opinion of management, are necessary to present fairly the
combined financial position of the Company at June 30, 1997 and the combined
results of operations and cash flows for the six months ended June 30, 1996
and 1997. Accounting measurements at interim dates inherently involve greater
reliance on estimates than at year end. The results of operations for the
interim periods presented are not necessarily indicative of the results to be
expected for the entire year.
 
(2)PROPERTY AND EQUIPMENT
 
  The major classes of property and equipment are as follows:
 
<TABLE>
<CAPTION>
                                                                         JUNE
                                               ESTIMATED   DECEMBER 31,   30,
                                              USEFUL LIVES     1996      1997
                                              ------------ ------------ -------
      <S>                                     <C>          <C>          <C>
      Land...................................         --     $   834    $   848
      Telecommunications towers..............   20 years      20,218     29,521
      Equipment..............................   10 years       1,589      2,085
      Transportation equipment...............    5 years       1,545      1,959
      Office furniture and equipment.........    7 years         585        874
      Leasehold improvements.................    5 years          65         65
                                                             -------    -------
                                                              24,836     35,352
      Less: accumulated depreciation.........                 (3,474)    (4,305)
                                                             -------    -------
                                                             $21,362    $31,047
                                                             =======    =======
</TABLE>
 
                                     F-33
<PAGE>
 
                             CROWN COMMUNICATIONS
 
         CONDENSED NOTES TO COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
                           (IN THOUSANDS OF DOLLARS)
 
(3) LONG-TERM DEBT
 
  Long-term debt consists of the following:
 
<TABLE>
<CAPTION>
                                                                         JUNE
                                                           DECEMBER 31,   30,
                                                               1996      1997
                                                           ------------ -------
      <S>                                                  <C>          <C>
      Bank credit agreement:
        Term note.........................................   $13,708    $13,125
        Revolving credit facility.........................     2,700      9,300
      Installment notes payable...........................       973      1,200
                                                             -------    -------
                                                              17,381     23,625
        Less: current maturities..........................    (1,447)    (1,525)
                                                             -------    -------
                                                             $15,934    $22,100
                                                             =======    =======
</TABLE>
 
(4) CONTINGENCIES
 
  The Company is involved in various claims and legal actions arising in the
ordinary course of business. While there are uncertainties inherent in the
ultimate outcome of such matters and it is impossible to presently determine
the ultimate costs that may be incurred, management believes the resolution of
such uncertainties and the incurrence of such costs should not have a material
adverse effect on the Company's combined financial position or results of
operations.
 
(5) SUBSEQUENT EVENTS
 
  In July 1997, the owners of CCM, CNS and CMS entered into an asset purchase
and merger agreement with Crown Castle International Corp. ("CCIC"). In August
1997, such agreement was amended and restated, and CCIC acquired (i)
substantially all of the assets, net of outstanding liabilities, of CCM and
(ii) all of the outstanding common stock of CNS and CMS.
 
  In August 1997, the Bank Credit Agreement was amended to increase the
Revolving Credit Facility to $27,000.
 
                                     F-34
<PAGE>
 
                         INDEPENDENT AUDITORS' REPORT
 
The Owners of Crown Communications,
 Crown Network Systems, Inc.,
 Crown Mobile Systems, Inc., Airport
 Communications, Inc. and E-90, Ltd.:
 
  We have audited the accompanying combined balance sheets of Crown
Communications, Crown Network Systems, Inc., Crown Mobile Systems, Inc.,
Airport Communications, Inc. and E-90, Ltd. (collectively, Crown
Communications) as of December 31, 1995 and 1996, and the related combined
statements of income, cash flows and owners' equity for the years then ended.
These combined financial statements are the responsibility of Crown
Communications' management. Our responsibility is to express an opinion on
these combined financial statements based on our audits.
 
  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audits to
obtain reasonable assurance about whether the combined financial statements
are free of material misstatement. An audit includes examining, on a test
basis, evidence supporting the amounts and disclosures in the combined
financial statements. An audit also includes assessing the accounting
principles used and significant estimates made by management, as well as
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion.
 
  In our opinion, the combined financial statements referred to above present
fairly, in all material respects, the combined financial position of Crown
Communications as of December 31, 1995 and 1996, and the combined results of
their operations and their cash flows for the year then ended in conformity
with generally accepted accounting principles.
 
                                          KPMG Peat Marwick llp
 
Pittsburgh, Pennsylvania
July 31, 1997
 
                                     F-35
<PAGE>
 
                              CROWN COMMUNICATIONS
 
                             COMBINED BALANCE SHEET
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                            ASSETS                              ---------------
                                                                 1995    1996
                                                                ------- -------
<S>                                                             <C>     <C>
Current assets:
  Cash and cash equivalents.................................... $   764 $   374
  Accounts receivable, net of allowance for doubtful accounts
   of $0 and $74 at December 31, 1995 and 1996, respectively...     553   2,147
  Inventory....................................................     687     614
  Accrued network services.....................................      --     653
  Deferred installation costs..................................      --     154
  Prepaid expenses and other current assets....................      73     189
                                                                ------- -------
    Total current assets.......................................   2,077   4,131
Property and equipment, net....................................  13,877  21,362
Other assets...................................................      60      96
                                                                ------- -------
                                                                $16,014 $25,589
                                                                ======= =======
<CAPTION>
                LIABILITIES AND OWNERS' EQUITY
<S>                                                             <C>     <C>
Current liabilities:
  Accounts payable............................................. $ 1,319 $ 2,514
  Accrued expenses.............................................     325     833
  Current installments of long-term debt.......................   1,526   1,447
  Customer deposits............................................     126     123
  Deferred revenue.............................................      19       3
                                                                ------- -------
    Total current liabilities..................................   3,315   4,920
Long-term debt, excluding current installments.................   9,049  15,934
Note payable--owner............................................      75      75
Deferred revenue...............................................      69     349
                                                                ------- -------
    Total liabilities..........................................  12,508  21,278
Commitments and contingencies (note 7)
Owners' equity:
  Common stock.................................................       7       7
  Additional paid-in capital...................................       9       9
  Owners' equity...............................................   3,490   4,295
                                                                ------- -------
    Total owners' equity.......................................   3,506   4,311
                                                                ------- -------
                                                                $16,014 $25,589
                                                                ======= =======
</TABLE>
 
            See accompanying notes to combined financial statements.
 
                                      F-36
<PAGE>
 
                              CROWN COMMUNICATIONS
 
                          COMBINED STATEMENT OF INCOME
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                                 YEARS ENDED
                                                                DECEMBER 31,
                                                               ----------------
                                                                1995     1996
                                                               -------  -------
<S>                                                            <C>      <C>
Net revenues:
  Site rental................................................. $ 3,632  $ 5,120
  Network services and other..................................   7,384   14,260
                                                               -------  -------
                                                                11,016   19,380
Operating costs and expenses:
  Site rental.................................................     763    1,691
  Network services and other..................................   3,944    8,632
  General and administrative expenses.........................   2,625    3,150
  Depreciation and amortization...............................     568    1,168
                                                               -------  -------
                                                                 7,900   14,641
                                                               -------  -------
    Operating income..........................................   3,116    4,739
Other income (expense):
  Interest and other income (expense).........................      19      (53)
  Interest expense............................................    (785)  (1,175)
                                                               -------  -------
    Net income................................................ $ 2,350  $ 3,511
                                                               =======  =======
</TABLE>
 
 
            See accompanying notes to combined financial statements.
 
                                      F-37
<PAGE>
 
                              CROWN COMMUNICATIONS
 
                      COMBINED STATEMENT OF OWNERS' EQUITY
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                    ADDITIONAL           TOTAL
                                             COMMON  PAID-IN   OWNERS'  OWNERS'
                                             STOCK   CAPITAL   EQUITY   EQUITY
                                             ------ ---------- -------  -------
<S>                                          <C>    <C>        <C>      <C>
Balance at January 1, 1995..................  $ 7      $ 9     $ 2,013  $ 2,029
Net income..................................   --       --       2,350    2,350
Distributions to owners.....................   --       --        (873)    (873)
                                              ---      ---     -------  -------
Balance at December 31, 1995................    7        9       3,490    3,506
Capital contribution........................   --       --         103      103
Net income..................................   --       --       3,511    3,511
Distributions to owners.....................   --       --      (2,809)  (2,809)
                                              ---      ---     -------  -------
Balance at December 31, 1996................  $ 7      $ 9     $ 4,295  $ 4,311
                                              ===      ===     =======  =======
</TABLE>
 
 
 
 
            See accompanying notes to combined financial statements.
 
                                      F-38
<PAGE>
 
                              CROWN COMMUNICATIONS
 
                        COMBINED STATEMENT OF CASH FLOWS
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                               YEARS ENDED
                                                              DECEMBER 31,
                                                            ------------------
                                                              1995      1996
                                                            --------  --------
<S>                                                         <C>       <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
 Net income................................................ $  2,350  $  3,511
 Adjustments to reconcile net income to net cash provided
  by operating activities:
  Depreciation and amortization............................      568     1,168
  Gain on sale of equipment................................      (71)       --
  Changes in operating assets and liabilities:
   Accounts receivable.....................................      205    (1,594)
   Inventory...............................................     (173)       73
   Prepaid expenses and other current assets...............      (22)     (117)
   Accrued network services................................       --      (653)
   Deferred installation costs.............................      356      (154)
   Other assets............................................      (20)      (36)
   Accounts payable........................................      149     1,195
   Accrued expenses........................................      216       508
   Customer deposits.......................................       43        (2)
   Deferred revenue........................................     (627)      263
                                                            --------  --------
    Net cash provided by operating activities..............    2,974     4,162
                                                            --------  --------
CASH FLOWS FROM INVESTING ACTIVITIES:
 Capital expenditures......................................   (5,670)   (8,658)
 Proceeds from sale of equipment...........................       --         6
                                                            --------  --------
    Net cash used for investing activities.................   (5,670)   (8,652)
                                                            --------  --------
CASH FLOWS FROM FINANCING ACTIVITIES:
 Proceeds from issuance of notes payable...................   14,929    22,614
 Principal payments on notes payable.......................  (11,689)  (15,808)
 Distributions to owners...................................     (873)   (2,809)
 Capital contribution......................................       --       103
                                                            --------  --------
    Net cash provided by financing activities..............    2,367     4,100
                                                            --------  --------
NET DECREASE IN CASH AND CASH EQUIVALENTS..................     (329)     (390)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR.............    1,093       764
                                                            --------  --------
CASH AND CASH EQUIVALENTS AT END OF YEAR................... $    764  $    374
                                                            ========  ========
Supplemental disclosure of cash flow information--interest
 paid...................................................... $    764  $  1,175
                                                            ========  ========
</TABLE>
 
            See accompanying notes to combined financial statements.
 
                                      F-39
<PAGE>
 
                             CROWN COMMUNICATIONS
 
                    NOTES TO COMBINED FINANCIAL STATEMENTS
 
              (IN THOUSANDS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
 
(1)BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
 (a) Basis of Presentation
 
  The accompanying combined financial statements include the accounts of Crown
Communications (CCM), a sole proprietorship, Crown Network Systems, Inc.
(CNS), a subchapter S corporation, Crown Mobile Systems, Inc. (CMS), a
subchapter S corporation, Airport Communications, Inc. (ACI), a subchapter S
corporation and E-90, Ltd. (E-90), a Pennsylvania Business Trust
(collectively, Crown Communications or the Company). These entities are all
under common ownership. All significant intercompany accounts and transactions
have been eliminated.
 
  Crown Communications is a communication site development and management
company. The Company's core business is the development of high density
communication facilities. The majority of these facilities are located
throughout western Pennsylvania. The Company leases antenna and transmitter
space on communication towers to companies using or providing wireless
telephone, paging and specialized mobile radio services.
 
  The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities, the
disclosure of contingent assets and liabilities as of the date of the
financial statements and the reported amounts of revenues and expenses during
the reporting period. Actual results could differ from those estimates.
 
 (b) Cash and Cash Equivalents
 
  The Company considers cash in depository institutions and short-term
investments with original maturities of three months or less to be cash and
cash equivalents.
 
 (c) Inventory
 
  Inventories are stated at the lower of cost or market. Cost is determined
using the first-in, first-out method.
 
 (d) Property and Equipment
 
  Property and equipment is stated at cost, net of accumulated depreciation.
Depreciation on property and equipment is computed utilizing methods which
approximate the straight-line method over the estimated useful lives of the
assets. Additions, renewals and improvements are capitalized, while
maintenance and repairs are expensed. Upon the sale or retirement of an asset,
the related cost and accumulated depreciation are removed from the accounts
and any gain or loss is recognized.
 
  In March 1995, the Financial Accounting Standards Board (the "FASB") issued
Statement of Financial Accounting Standards No. 121, Accounting for the
Impairment of Long-Lived Assets and for Long-Lived Assets to Be Disposed Of
("SFAS 121"). SFAS 121 requires that long-lived assets and certain
identifiable intangibles be reviewed for impairment whenever events or changes
in circumstances indicate that the carrying amount of an asset may not be
recoverable. SFAS 121 is effective for fiscal years beginning after December
15, 1995. The adoption of SFAS 121 by the Company in 1996 did not have a
material impact on its combined financial statements.
 
                                     F-40
<PAGE>
 
                             CROWN COMMUNICATIONS
 
              NOTES TO COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
              (IN THOUSANDS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
 
 (e) Other Assets
 
  Other assets include deferred financing costs which are amortized over the
estimated term of the related borrowing.
 
 (f) Fair Value of Financial Instruments
 
  The carrying amounts of cash and cash equivalents approximate the fair value
for these instruments. The carrying amount of long-term debt approximates its
fair value because the interest rates approximate market. The estimated fair
values of the Company's financial instruments, along with the carrying amounts
of the related assets (liabilities), are as follows:
 
<TABLE>
<CAPTION>
                                         DECEMBER 31, 1995   DECEMBER 31, 1996
                                         ------------------  ------------------
                                         CARRYING    FAIR    CARRYING    FAIR
                                          AMOUNT    VALUE     AMOUNT    VALUE
                                         --------  --------  --------  --------
   <S>                                   <C>       <C>       <C>       <C>
   Cash and cash equivalents............ $    764  $    764  $    374  $    374
   Long-term debt.......................  (10,575)  (10,575)  (17,381)  (17,381)
</TABLE>
 
 (g) Revenue Recognition
   
  Equipment sales revenues are recognized when products are delivered to
customers.     
 
  Site rental revenue is recognized ratably over the terms of the respective
leases. Such leases have terms that are generally five years.
   
  Network services revenues are recognized under a method which approximates
the completed contract method. This method is used because typical network
services are completed in 3 months or less and financial position and results
of operations do not vary significantly from those which would result from use
of the percentage-of-completion method. The network services are considered
complete at the point in time in which the terms and conditions of the
contract and/or agreement have been substantially completed. Revenues from
completed contracts which have not been billed at the end of an accounting
period are presented as accrued network services.     
   
  Costs and revenues associated with installations not complete at the end of
an accounting period are deferred and recognized when the installation becomes
operational. Any losses on contracts are recognized at such time as they
become known.     
 
(2) PROPERTY AND EQUIPMENT
 
  The major classes of property and equipment are as follows:
 
<TABLE>
<CAPTION>
                                                                DECEMBER 31,
                                                   ESTIMATED   ----------------
                                                  USEFUL LIVES  1995     1996
                                                  ------------ -------  -------
   <S>                                            <C>          <C>      <C>
   Land..........................................         --   $   767  $   834
   Telecommunications towers.....................   20 years    13,014   20,218
   Equipment.....................................   10 years     1,266    1,589
   Transportation equipment......................    5 years       663    1,545
   Office furniture and equipment................    7 years       373      585
   Leasehold improvements........................    5 years        50       65
                                                               -------  -------
                                                                16,133   24,836
   Less: accumulated depreciation................               (2,256)  (3,474)
                                                               -------  -------
                                                               $13,877  $21,362
                                                               =======  =======
</TABLE>
 
                                     F-41
<PAGE>
 
                             CROWN COMMUNICATIONS
 
              NOTES TO COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
              (IN THOUSANDS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
 
  Accumulated depreciation on telecommunications towers was $1,577 and $2,333
at December 31, 1995 and 1996, respectively.
 
  The Company leases antenna and transmitter space on communication towers
through noncancelable operating leases. Future minimum rentals receivable
under noncancelable operating leases for towers at December 31, 1996, are as
follows:
 
<TABLE>
<CAPTION>
       YEARS ENDING
       DECEMBER 31,
       ------------
       <S>                                                               <C>
        1997............................................................ $ 5,900
        1998............................................................   5,300
        1999............................................................   4,600
        2000............................................................   3,900
        2001............................................................   2,300
        Thereafter......................................................   2,300
                                                                         -------
                                                                         $24,300
                                                                         =======
</TABLE>
 
(3) LONG-TERM DEBT
 
  Long-term debt consists of the following:
 
<TABLE>
<CAPTION>
                                                                DECEMBER 31,
                                                               ----------------
                                                                1995     1996
                                                               -------  -------
       <S>                                                     <C>      <C>
       Bank credit agreement:
         Term note............................................ $ 9,846  $13,708
         Revolving credit facility............................     450    2,700
       Installment notes payable..............................     279      973
                                                               -------  -------
                                                                10,575   17,381
         Less: current maturities.............................  (1,526)  (1,447)
                                                               -------  -------
                                                               $ 9,049  $15,934
                                                               =======  =======
</TABLE>
 
 Bank Credit Agreement
 
  On November 22, 1995, Crown Communications and the owners entered into a
restated credit agreement with a bank (the "Bank Credit Agreement"). The Bank
Credit Agreement made available to the borrowers (i) a term note in the
original amount of $9,964 to refinance existing debt, and (ii) a $5,000
secured line of credit. On September 19, 1996, the Bank Credit Agreement was
amended to provide for a $14,000 term note (the "Term Note") and a $15,000
secured revolving line of credit (the "Revolving Credit Facility").
 
  The Term Note is payable in twenty-seven equal quarterly installments of
$292 commencing on December 31, 1996, plus a final installment of the
outstanding principal balance and all accrued and unpaid interest on September
19, 2003. In addition, on June 30 of each year, the Term Note shall be reduced
by an amount equal to 25% of the borrowers' excess cash flow, as defined. The
Term Note bears interest, at the option of the borrowers with restrictions, at
either the Eurodollar rate plus 2.0% per annum or an "as-offered rate' as
defined by the Bank Credit Agreement. The interest rate on the Term Note is
7.72% at September 30, 1997.
 
                                     F-42
<PAGE>
 
                             CROWN COMMUNICATIONS
 
              NOTES TO COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
              (IN THOUSANDS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
 
  The Revolving Credit Facility provides for quarterly interest payments based
on the Fed Funds rate plus 2.0% per annum (7.22% as of December 31, 1996).
Borrowings under this facility are limited by a "borrowing base' as defined.
On each of three conversion dates (September 19, 1997, 1998 and 1999), the
then aggregate outstanding principal balances under the Revolving Credit
Facility are to be converted to term loans and the line of credit commitment
will be permanently reduced by such converted amount. Any such principal
amount so converted will be payable in twenty-seven equal quarterly
installments, beginning on the last day of December following such conversion
date, in an amount equal to 1/48 of the converted balance, plus a final
installment of the outstanding principal balance and all accrued and unpaid
interest.
 
  The Bank Credit Agreement is secured by substantially all of the Company's
assets and assignment of tower leases, requires the Company to maintain
certain financial covenants and places restrictions on the Company's ability
to, among other things, incur debt and liens, dispose of assets, undertake
transactions with affiliates and make investments.
 
 Installment Notes Payable
 
  The installment notes payable mature at various dates from 1997 to 2002,
bear interest at rates ranging from 4.80% to 12.62% per annum, call for
monthly payments of principal and interest and are secured by automobiles and
other equipment.
 
 Maturities
 
  Scheduled maturities of long-term debt outstanding as of December 31, 1996,
are as follows: years ending December 31, 1997--$1,447; 1998--$1,434; 1999--
$1,420; 2000--$1,331; 2001--$1,174; thereafter--$10,575. Amounts outstanding
under the Revolving Credit Facility are included in the "thereafter' category
because their ultimate repayment schedule once and if converted to a term note
cannot be presently determined.
 
(4) COMMON STOCK
 
  The combined financial statements reflect the common stock of various
subchapter S corporations as follows (at December 31, 1995 and 1996):
 
<TABLE>
<CAPTION>
                                                              SHARES AUTHORIZED,
                                                         PAR      ISSUED AND
                                                        VALUE    OUTSTANDING
                                                        ----- ------------------
       <S>                                              <C>   <C>
       Common stock--CNS...............................  $ 1        1,000
       Common stock--CMS...............................    1        1,000
       Common stock--ACI...............................   50          100
</TABLE>
 
(5) INCOME TAXES
 
  CCM is operated as a sole proprietorship and all income or loss is passed
through to the personal tax return of the owners. The shareholders for CNS,
CMS and ACI have elected under subchapter S of the Internal Revenue Code to
pass through all income or loss to the individual tax return of the
shareholders. E-90 is operated as a Pennsylvania Business Trust and has
elected to be taxed as a partnership. Accordingly, no provision for income
taxes has been recorded in the accompanying financial statements.
 
                                     F-43
<PAGE>
 
                             CROWN COMMUNICATIONS
 
              NOTES TO COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
              (IN THOUSANDS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
 
(6) RETIREMENT SAVINGS PLAN
 
  The Company sponsors a Retirement Savings Plan (the "Plan"), which qualifies
for treatment under section 401(k) of the Internal Revenue Code. Substantially
all full-time employees are eligible to participate by electing to contribute
1% to 15% of their gross pay to the Plan. Under the Plan, the Company matches
a portion of each employee's contribution up to certain limits. Each
employee's contribution is fully vested when contributed, and the Company's
matching contribution begins vesting after an employee has completed two years
of service and becomes fully vested after six years of service. For the years
ended December 31, 1995 and 1996, the Company's expense for the Plan was $6
and $59, respectively.
 
(7) COMMITMENTS AND CONTINGENCIES
 
  The Company leases land, office space and site space on towers and rooftops
through contracts that expire in various years through 2095. The Company has
purchase and renewal options and is committed to various escalation provisions
under certain of these leases. Rental expense under operating leases was $306
and $669 for the years ended December 31, 1995 and 1996, respectively. At
December 31, 1996, minimum rental commitments under operating leases are as
follows:
 
<TABLE>
<CAPTION>
       YEARS ENDING
       DECEMBER 31,
       ------------
       <S>                                                               <C>
        1997............................................................ $ 1,000
        1998............................................................   1,000
        1999............................................................   1,000
        2000............................................................     800
        2001............................................................     600
        Thereafter......................................................  34,100
                                                                         -------
                                                                         $38,500
                                                                         =======
</TABLE>
 
  The Company is involved in various claims and legal actions arising in the
ordinary course of business. While there are uncertainties inherent in the
ultimate outcome of such matters and it is impossible to presently determine
the ultimate costs that may be incurred, management believes the resolution of
such uncertainties and the incurrence of such costs should not have a material
adverse effect on the Company's combined financial position or results of
operations.
 
(8) CONCENTRATIONS OF CREDIT RISK
 
  Financial instruments that potentially subject the Company to concentrations
of credit risk are primarily cash and cash equivalents and accounts
receivable. The Company mitigates its risk with respect to cash and cash
equivalents by maintaining such deposits at high credit quality financial
institutions and monitoring the credit ratings of those institutions.
 
  The Company derives the largest portion of its revenues from customers in
the wireless telecommunications industry. In addition, the Company has
concentrations of operations in western Pennsylvania. The Company mitigates
its concentrations of credit risk with respect to accounts receivable by
actively monitoring the creditworthiness of its customers. Historically, the
Company has not incurred any significant credit related losses.
 
  For the year ended December 31, 1995, the Company recognized revenues from
two individual customers in the amount of $4,139 and $668. For the year ended
December 31, 1996, the Company recognized revenues from three individual
customers in the amount of $3,700, $2,600, and $1,400.
 
                                     F-44
<PAGE>
 
                             CROWN COMMUNICATIONS
 
              NOTES TO COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
              (IN THOUSANDS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
 
(9) SUBSEQUENT EVENTS
 
  In July 1997, the owners of CCM, CNS and CMS entered into an asset purchase
and merger agreement with Crown Castle International Corp. ("CCIC"). In August
1997, such agreement was amended and restated, and CCIC acquired (i)
substantially all of the assets, net of outstanding liabilities, of CCM and
(ii) all of the outstanding common stock of CNS and CMS.
 
                                     F-45
<PAGE>
 
                        REPORT OF INDEPENDENT AUDITORS
 
Board of Directors
TEA Group Incorporated
 
  We have audited the balance sheet of TEA Group Incorporated as of December
31, 1995, and the related statements of income, shareholders' equity and cash
flows for the year then ended. These financial statements are the
responsibility of the Company's management. Our responsibility is to express
an opinion on these financial statements based on our audit.
 
  We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audit provides a reasonable basis
for our opinion.
 
  In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of TEA Group Incorporated as
of December 31, 1995, and the results of its operations and its cash flows for
the year then ended in conformity with generally accepted accounting
principles.
 
                                          Ernst & Young llp
 
Atlanta, Georgia
February 28, 1996
 
                                     F-46
<PAGE>
 
                         INDEPENDENT AUDITORS' REPORT
 
The Board of Directors
TEA Group Incorporated:
 
  We have audited the accompanying balance sheet of TEA Group Incorporated as
of December 31, 1996, and the related statements of income, shareholders'
equity, and cash flows for the year then ended. These financial statements are
the responsibility of the Company's management. Our responsibility is to
express an opinion on these financial statements based on our audit.
 
  We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audit provides a reasonable basis
for our opinion.
 
  In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of TEA Group Incorporated as
of December 31, 1996, and the results of its operations and its cash flows for
the year then ended in conformity with generally accepted accounting
principles.
 

                                          KPMG Peat Marwick LLP
 
Atlanta, Georgia
August 15, 1997
 
                                     F-47
<PAGE>
 
                             TEA GROUP INCORPORATED
 
                                 BALANCE SHEET
 
                (IN THOUSANDS OF DOLLARS, EXCEPT SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                     DECEMBER 31,
                                                                     --------------
                                                                      1995    1996
                               ASSETS                                ------  ------
<S>                                                                  <C>     <C>
Current assets:
  Cash.............................................................. $    5  $   --
  Accounts receivable, net of allowance for doubtful accounts of
   $100 and $1 at December 31, 1995 and 1996, respectively (note 5):
    Billed..........................................................  4,637   3,553
    Unbilled........................................................  1,335     465
  Employee advances.................................................     --      14
  Note and accrued interest receivable--related party...............     58       6
  Prepaid expenses..................................................     24       3
                                                                     ------  ------
      Total current assets..........................................  6,059   4,041
                                                                     ------  ------
Property and equipment, at cost:
  Leasehold improvements............................................      9       9
  Office and computer equipment.....................................    757     831
  Furniture and fixtures............................................    343     345
  Computer software.................................................     --      85
                                                                     ------  ------
                                                                      1,109   1,270
  Less accumulated depreciation and amortization....................   (653)   (787)
                                                                     ------  ------
                                                                        456     483
Other assets........................................................     62      47
                                                                     ------  ------
                                                                     $6,577  $4,571
                                                                     ======  ======
<CAPTION>
                LIABILITIES AND SHAREHOLDERS' EQUITY
<S>                                                                  <C>     <C>
Current liabilities:
  Notes payable (note 2)............................................ $2,733  $  107
  Accounts payable..................................................  1,328   1,366
  Accrued compensation and related benefits.........................    557     445
  Other accrued expenses............................................     --      52
                                                                     ------  ------
      Total current liabilities.....................................  4,618   1,970
Commitments (note 3)
Shareholders equity (note 7):
  Common stock, $1 par value, 10,000 shares authorized; 550 shares
   issued and
   outstanding......................................................      1       1
  Additional paid-in capital........................................     11      11
  Retained earnings.................................................  1,947   2,589
                                                                     ------  ------
      Total shareholders equity.....................................  1,959   2,601
                                                                     ------  ------
                                                                     $6,577  $4,571
                                                                     ======  ======
</TABLE>
 
                See accompanying notes to financial statements.
 
                                      F-48
<PAGE>
 
                             TEA GROUP INCORPORATED
 
                              STATEMENT OF INCOME
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>   
<CAPTION>
                                                                THREE MONTHS
                                                YEARS ENDED         ENDED
                                               DECEMBER 31,       MARCH 31,
                                              ----------------  --------------
                                               1995     1996     1996    1997
                                              -------  -------  ------  ------
                                                                 (UNAUDITED)
<S>                                           <C>      <C>      <C>     <C>
Network services and other revenues, net
 (note 6).................................... $23,585  $18,010  $4,376  $4,873
Operating costs and expenses:
  Services and other (exclusive of
   depreciation and amortization)............  18,770   14,406   3,280   4,048
  General and administrative expenses........   4,077    2,295     529     482
  Depreciation and amortization..............     127      134      31      38
                                              -------  -------  ------  ------
                                               22,974   16,835   3,840   4,568
                                              -------  -------  ------  ------
    Operating income.........................     611    1,175     536     305
Other income (expense):
  Interest and other income..................      17        3      --      --
  Interest expense...........................    (158)    (127)    (47)     (5)
                                              -------  -------  ------  ------
    Income before income taxes...............     470    1,051     489     300
Income taxes (note 1(d)).....................      --       --      --      --
                                              -------  -------  ------  ------
    Net income............................... $   470  $ 1,051  $  489  $  300
                                              =======  =======  ======  ======
</TABLE>    
 
 
                See accompanying notes to financial statements.
 
                                      F-49
<PAGE>
 
                             TEA GROUP INCORPORATED
 
                       STATEMENT OF SHAREHOLDERS' EQUITY
 
                (IN THOUSANDS OF DOLLARS, EXCEPT SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                          COMMON STOCK  ADDITIONAL              TOTAL
                         --------------  PAID-IN   RETAINED SHAREHOLDERS'
                         SHARES AMOUNTS  CAPITAL   EARNINGS    EQUITY
                         ------ ------- ---------- -------- -------------
<S>                      <C>    <C>     <C>        <C>      <C>
Balance at January 1,
 1995...................  550     $ 1      $11      $2,359     $2,371
Net income..............   --      --       --         470        470
Shareholder
 distributions..........   --      --       --        (882)      (882)
                          ---     ---      ---      ------     ------
Balance at December 31,
 1995...................  550       1       11       1,947      1,959
Net income..............   --      --       --       1,051      1,051
Shareholder
 distributions..........   --      --       --        (409)      (409)
                          ---     ---      ---      ------     ------
Balance at December 31,
 1996...................  550     $ 1      $11      $2,589     $2,601
                          ===     ===      ===      ======     ======
</TABLE>
 
 
 
                See accompanying notes to financial statements.
 
                                      F-50
<PAGE>
 
                             TEA GROUP INCORPORATED
 
                            STATEMENT OF CASH FLOWS
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>   
<CAPTION>
                                                               THREE MONTHS
                                                YEARS ENDED        ENDED
                                               DECEMBER 31,      MARCH 31,
                                               --------------  --------------
                                                1995    1996    1996    1997
                                               ------  ------  ------  ------
                                                                (UNAUDITED)
<S>                                            <C>     <C>     <C>     <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income.................................. $  470  $1,051  $  489  $  300
  Adjustment to reconcile net income to net
   cash provided by (used for) operating
   activities:
    Depreciation and amortization.............    127     134      31      38
    Provision for doubtful accounts (note 6)..     --     355     125      --
    Gain on sale of property and equipment,
     and other assets.........................    (12)    (1)      (1)     --
    Decrease (increase) in:
      Billed accounts receivable.............. (1,714)    729    (103)   (735)
      Unbilled accounts receivable............   (336)    870   1,439     119
      Other assets............................    (25)     29     (15)    (73)
    Increase (decrease) in:
      Accounts payable........................    381      37  (1,219)   (925)
      Accrued expenses........................    142     (59)   (101)     37
                                               ------  ------  ------  ------
        Net cash provided by (used for)
         operating activities.................   (967)  3,145     645  (1,239)
                                               ------  ------  ------  ------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchases of property and equipment.........   (250)   (161)    (29)    (23)
  Proceeds from sale of property and
   equipment, and other assets................     25       1       1      --
  Increase in deposits........................     16      --      --      --
  Payments received on note receivable........     --      45       8      --
                                               ------  ------  ------  ------
        Net cash used for investing
         activities...........................   (209)   (115)    (20)    (23)
                                               ------  ------  ------  ------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Net borrowings (repayments) under revolving
   credit agreement...........................  2,057  (2,626)    276   1,262
  Shareholder distributions...................   (882)   (409)     --      --
                                               ------  ------  ------  ------
        Net cash provided by (used for)
         financing activities.................  1,175  (3,035)    276   1,262
                                               ------  ------  ------  ------
        Net increase (decrease) in cash.......     (1)     (5)    901      --
CASH AT BEGINNING OF PERIOD...................      6       5       5      --
                                               ------  ------  ------  ------
CASH AT END OF PERIOD......................... $    5  $   --  $  906  $   --
                                               ======  ======  ======  ======
Supplemental disclosure of cash flow
 information--cash paid during the period for
 interest..................................... $  149  $  138  $   47  $   --
                                               ======  ======  ======  ======
</TABLE>    
 
                See accompanying notes to financial statements.
 
                                      F-51
<PAGE>
 
                            TEA GROUP INCORPORATED
 
                         NOTES TO FINANCIAL STATEMENTS
 
                           (IN THOUSANDS OF DOLLARS)
 
(1) BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
 (a) Basis of Presentation
 
  TEA Group Incorporated (the "Company") provides services to the wireless
telecommunications and energy transmission industries. These services include
providing right-of-way, site acquisition, engineering design and drafting,
project management, and staff leasing to wireless telecommunications and
energy transmission companies in the United States and internationally.
 
  Management of the Company has made a number of estimates and assumptions
relating to the reporting of assets and liabilities and the disclosure of
contingent assets and liabilities as of the date of the financial statements
and revenues and expenses for the reporting period to prepare these financial
statements in conformity with generally accepted accounting principles. Actual
results could differ from those estimates.
   
  The financial statements for the three months ended March 31, 1996 and 1997
are unaudited; however, they include all adjustments (consisting only of
normal recurring adjustments) which, in the opinion of management, are
necessary to present fairly the results of operations and cash flows for the
three months ended March 31, 1996 and 1997. Accounting measurements at interim
dates inherently involve greater reliance on estimates than at year end. The
results of operations for the interim periods presented are not necessarily
indicative of the results to be expected for the entire year.     
 
 (b) Revenue Recognition
 
  The Company's revenues are derived primarily from service contracts with
customers which provide for billings on a time and materials, cost plus
profit, or fixed price basis. Such contracts typically have terms from six
months to two years. Revenues are recognized as services are performed with
respect to the time and materials priced contracts, and are recognized using
the percentage-of-completion method for cost plus profit and fixed price
contracts, measured by the percentage of contract costs incurred to date to
estimated total contract costs. Provisions for estimated losses on uncompleted
contracts are made in the period in which such losses are determined.
 
 (c) Property and Equipment
 
  Property and equipment are stated at cost less accumulated depreciation and
amortization. Depreciation is provided over the estimated useful lives of the
assets on a straight-line basis. Leasehold improvements are amortized over the
shorter of their estimated useful lives or the remaining lease term. Property
and equipment are depreciated over the following estimated useful lives:
 
<TABLE>
<CAPTION>
                                                                           YEARS
                                                                           -----
      <S>                                                                  <C>
      Leasehold improvements..............................................    5
      Office and computer equipment.......................................    5
      Furniture and fixtures..............................................    7
      Computer software...................................................    5
</TABLE>
 
  The Company adopted the provisions of Statement of Financial Accounting
Standards ("SFAS") 121, Accounting for the Impairment of Long-Lived Assets and
for Long-Lived Assets to Be Disposed Of, on January 1, 1996. This statement
requires that long-lived assets and certain identifiable intangibles be
reviewed for impairment whenever events or changes in circumstances indicate
that the carrying amount of an asset may not be recoverable. Recoverability of
assets to be held and used is measured by a comparison of the carrying amount
of an asset to future net cash flows expected to be generated by the asset. If
such assets are considered to be impaired, the impairment to be recognized is
measured by the amount by which the carrying amount of the assets exceed the
fair value of the assets. Assets to be disposed of are reported at the lower
of the carrying amount or fair value less costs to sell. Adoption of this
statement did not have an impact on the Company's financial statements.
 
                                     F-52
<PAGE>
 
                            TEA GROUP INCORPORATED
 
                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)
 
                           (IN THOUSANDS OF DOLLARS)
 
 (d) Income Taxes
 
  The shareholders of the Company have elected to be taxed under the
Subchapter S Corporation provisions of the Internal Revenue Code. As a result
of this election, Federal and state income taxes related to the results of
operations of the Company are passed through to, and are the responsibility
of, the Company's shareholders. Accordingly, no provision for income taxes has
been recorded in the accompanying financial statements.
 
 (e) Fair Value of Financial Instruments
 
  The carrying value of the notes payable approximates the estimated fair
value for this instrument since it bears interest at a floating market rate.
The estimated fair values of the Company's financial instruments, along with
the carrying amounts of the related assets (liabilities), are as follows:
 
<TABLE>
<CAPTION>
                                                 DECEMBER 31,      DECEMBER 31,
                                                     1995              1996
                                               -----------------  --------------
                                               CARRYING   FAIR    CARRYING FAIR
                                                AMOUNT    VALUE    AMOUNT  VALUE
                                               --------  -------  -------- -----
   <S>                                         <C>       <C>      <C>      <C>
   Cash....................................... $     5   $     5   $  --   $  --
   Notes payable..............................  (2,733)   (2,733)   (107)   (107)
</TABLE>
 
(2) NOTES PAYABLE
 
  The Company has a revolving line of credit with a bank for working capital
purposes (as amended, the "Bank Line of Credit"). The Bank Line of Credit
provides for up to $5,000 of working capital borrowings and up to $200 of
borrowings for purchases of equipment. At December 31, 1996, outstanding
working capital borrowings under the Bank Line of Credit amounted to $107.
Borrowings are secured by the Company's receivables, property and equipment,
intangibles and cash balances, and bear interest at a rate per annum equal to
(i) the bank's prime rate or (ii) a Eurodollar interbank offered rate (LIBOR)
plus 2.45% (8.25% and 7.95%, respectively, at December 31, 1996). Interest is
payable monthly. The Bank Line of Credit requires the Company to maintain
certain financial covenants and places limitations on its ability to, among
other things, incur debt and liens, undertake transactions with affiliates and
make investments.
 
  On July 30, 1997, the Bank Line of Credit was amended to decrease the
available borrowings to $3,000 and extend the maturity date to June 30, 1998.
Borrowings now bear interest at a rate per annum equal to LIBOR plus 2.7%
(8.39% at July 31, 1997). In addition, the amended Bank Line of Credit now
restricts the ability of the Company to pay dividends.
 
(3) COMMITMENTS
 
  The Company has noncancelable operating leases for office space. Future
minimum lease payments under the operating leases with remaining terms of one
year or more at December 31, 1996 are summarized as follows:
 
<TABLE>
<CAPTION>
       YEARS ENDING
       DECEMBER 31,
       ------------
       <S>                                                                  <C>
        1997............................................................... $316
        1998...............................................................  315
        1999...............................................................  289
        2000...............................................................   43
                                                                            ----
                                                                            $963
                                                                            ====
</TABLE>
 
  Rent expense under all cancelable and noncancelable operating leases for
1995 and 1996 was $459 and $608, respectively.
 
                                     F-53
<PAGE>
 
                            TEA GROUP INCORPORATED
 
                  NOTES TO FINANCIAL STATEMENTS--(CONTINUED)
 
                           (IN THOUSANDS OF DOLLARS)
 
(4)EMPLOYEE BENEFIT PLAN
 
  The Company maintains a 401(k) profit sharing and retirement plan (the
"Plan") for the benefit of all eligible employees. Employees may elect to
contribute up to 15% of their eligible compensation to the Plan. The Plan
provides for employer matching contributions at the discretion of the
Company's Board of Directors. The Company provided $66 and $29 in expense for
contributions for 1995 and 1996, respectively.
 
(5)RELATED PARTY TRANSACTIONS
 
  Accounts receivable balances at December 31, 1995 and 1996 include
approximately $398 and $94, respectively, from an affiliated company related
to expenses incurred by the Company on behalf of the affiliated company.
 
(6) CONCENTRATIONS OF CREDIT RISK
 
  Financial instruments that potentially subject the Company to concentrations
of credit risk are primarily cash and trade receivables. The Company mitigates
its risk with respect to cash by maintaining such deposits at high credit
quality financial institutions and monitoring the credit ratings of those
institutions.
 
  The Company derives the largest portion of its revenues from customers in
the wireless telecommunications and energy transmission industries. The
Company mitigates its concentrations of credit risk with respect to trade
receivables by actively monitoring the creditworthiness of its customers. In
connection with a disputed receivable with a customer, the Company wrote off
$310 during 1996.
 
  For the year ended December 31, 1995, the Company had five customers
representing 19%, 18%, 16%, 13% and 11% of net revenues, respectively. For the
year ended December 31, 1996, the Company had two customers which accounted
for 35% and 14% of net revenues, respectively, and one customer which
accounted for approximately 59% of accounts receivable at December 31, 1996.
 
(7)SUBSEQUENT EVENT
 
  In July 1996, the Company, its shareholders, and certain affiliated
companies entered into an agreement with Crown Castle International Corp.
("CCIC") which provided CCIC with an option to acquire various ownership
interests in the Company. On May 12, 1997, CCIC acquired all of the Company's
common stock.
 
                                     F-54
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
                         INDEPENDENT AUDITORS' REPORT
 
To the Shareholders and Board of Directors
of Castle Transmission Services (Holdings) Ltd:
 
  We have audited the accompanying balance sheets of the BBC Home Service
Transmission business ("Home Service") at March 31, 1995 and 1996 and the
consolidated balance sheet of Castle Transmission Services (Holdings) Ltd and
its subsidiary ("Castle Transmission") at March 31, 1997 and the profit and
loss accounts, cash flow statements and reconciliations of movements in
corporate funding for Home Service for the years ended March 31, 1995 and 1996
and the period from April 1, 1996 to February 27, 1997 and the related
consolidated profit and loss account, consolidated cash flow statement and
consolidated reconciliation of movements in shareholders' funds for Castle
Transmission for the period from February 28, 1997 to March 31, 1997. These
financial statements are the responsibility of Castle Transmission's and Home
Service's management. Our responsibility is to express an opinion on these
financial statements based on our audits.
 
  We conducted our audits in accordance with generally accepted auditing
standards in the United Kingdom, which do not differ in any material respect
from generally accepted auditing standards in the United States. Those
standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free from material
misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant
estimates made by management as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.
 
  In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Home Service at March 31,
1995 and 1996 and the consolidated financial position of Castle Transmission
at March 31, 1997 and the results of operations and cash flows of Home Service
for the years ended March 31, 1995 and 1996 and for the period from April 1,
1996 to February 27, 1997 and of Castle Transmission for the period from
February 28, 1997 to March 31, 1997 in conformity with generally accepted
accounting principles in the United Kingdom.
 
  Generally accepted accounting principles in the United Kingdom vary in
certain respects from generally accepted accounting principles in the United
States. Application of generally accepted accounting principles in the United
States would have affected results of operations for the year ended March 31,
1996 and the period from April 1, 1996 to February 27, 1997 for Home Service
and the period from February 28, 1997 to March 31, 1997 for Castle
Transmission and shareholders' equity as of March 31, 1996 for Home Service
and as of March 31, 1997 for Castle Transmission to the extent summarised in
Note 27 to these financial statements.
 
KPMG
Chartered Accountants
Registered Auditor
London, England
 
October 15, 1997
 
                                     F-55
<PAGE>
 
         CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                   THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
                     CONSOLIDATED PROFIT AND LOSS ACCOUNTS
 
<TABLE>
<CAPTION>
                                                                       CASTLE TRANSMISSION SERVICES
                                     BBC HOME SERVICE TRANSMISSION            (HOLDINGS) LTD
                                 ------------------------------------- --------------------------------
                                                            PERIOD        PERIOD             PERIOD
                                                         FROM APRIL 1,     FROM          FROM APRIL 1,
                                       YEARS ENDED           1996      FEBRUARY 28,           1997
                                        MARCH 31,             TO           1997                TO
                                 ----------------------- FEBRUARY 27,  TO MARCH 31,      SEPTEMBER 30,
                           NOTE     1995        1996         1997          1997               1997
                          ------ ----------- ----------- ------------- -------------     --------------
                                 (Pounds)000 (Pounds)000  (Pounds)000   (Pounds)000       (Pounds)000
                                                                                          (UNAUDITED)
<S>                       <C>    <C>         <C>         <C>           <C>               <C>
Turnover................       3    58,816      70,367       70,614               6,433             37,400
Changes in stocks and
 work in progress.......              (452)       (635)        (554)                340               (146)
Own work capitalised....             4,190       4,653        3,249                 170                819
Raw materials and
 consumables............            (1,048)         14       (1,155)               (446)              (985)
Other external charges..           (30,545)    (34,750)     (26,191)             (1,668)            (9,156)
Staff costs.............       4   (18,498)    (17,197)     (16,131)             (1,421)            (9,476)
Depreciation and other
 amounts written off
 tangible and intangible
 assets.................       5   (12,810)    (12,835)     (13,038)             (1,819)           (11,233)
Other operating
 charges................            (2,258)     (1,832)      (2,792)               (344)            (1,394)
                                   -------     -------      -------       -------------     --------------
                                   (61,421)    (62,582)     (56,612)             (5,188)           (31,571)
Operating
 profit/(loss)..........            (2,605)      7,785       14,002               1,245              5,829
Other interest
 receivable and similar
 income.................               --          --           --                   49                198
Interest payable and
 similar charges........       7       --          --           --                 (969)            (8,909)
                                   -------     -------      -------       -------------     --------------
Profit/(loss) on
 ordinary activities
 before and after
 taxation...............  3-6, 8    (2,605)      7,785       14,002                 325             (2,882)
Additional finance cost
 of non-equity shares...               --          --           --                 (318)            (1,908)
                                   -------     -------      -------       -------------     --------------
Retained profit/(loss)
 for the period.........            (2,605)      7,785       14,002                   7             (4,790)
                                   =======     =======      =======       =============     ==============
</TABLE>
 
  Neither BBC Home Service nor Castle Transmission have any recognised gains or
losses other than those reflected in the profit and loss accounts.
 
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                      F-56
<PAGE>
 
         CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                   THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
                          CONSOLIDATED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                 BBC HOME SERVICE     CASTLE TRANSMISSION SERVICES
                                   TRANSMISSION              (HOLDINGS) LTD
                              ----------------------- -----------------------------
                                   AT MARCH 31,
                              ----------------------- AT MARCH 31, AT SEPTEMBER 30,
                                 1995        1996         1997           1997
                         NOTE ----------- ----------- ------------ ----------------
                              (Pounds)000 (Pounds)000 (Pounds)000    (Pounds)000
                                                                     (UNAUDITED)
<S>                      <C>  <C>         <C>         <C>          <C>
FIXED ASSETS
  Intangible............   9        --          --        46,573         45,725
  Tangible..............  10    198,237     202,592      206,162        204,969
                                -------     -------     --------       --------
                                198,237     202,592      252,735        250,694
CURRENT ASSETS
  Stocks................  11      1,072       1,750          807            798
  Debtors...............  12      7,285       4,714       10,344         10,591
  Cash at bank and in
   hand.................            --          --         9,688          3,812
                                -------     -------     --------       --------
                                  8,357       6,464       20,839         15,201
Creditors: amounts
 falling due within one
 year...................  13     (4,829)     (6,627)     (14,820)       (20,671)
                                -------     -------     --------       --------
Net current
 assets/(liabilities)...          3,528        (163)       6,019         (5,470)
                                -------     -------     --------       --------
Total assets less
 current liabilities....        201,765     202,429      258,754        245,224
Creditors: amounts
 falling due after more
 than one year..........  14        --          --      (154,358)      (143,464)
Provisions for
 liabilities and
 charges................  15        --          --        (1,723)        (1,419)
                                -------     -------     --------       --------
Net assets..............        201,765     202,429      102,673        100,341
                                =======     =======     ========       ========
CAPITAL AND RESERVES
  Corporate funding.....        201,765     202,429          --             --
  Called up share
   capital..............  16        --          --       102,348        102,898
  Profit and loss
   account..............  17        --          --           325         (2,557)
                                -------     -------     --------       --------
                                201,765     202,429      102,673        100,341
                                -------     -------     --------       --------
SHAREHOLDERS'
 FUNDS/(DEFICIT)
  Equity................                                     109         (4,680)
  Non-equity............                                 102,564        105,021
                                                        --------       --------
                                                         102,673        100,341
                                                        ========       ========
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                      F-57
<PAGE>
 
         CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                   THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
                       CONSOLIDATED CASH FLOW STATEMENTS
 
<TABLE>
<CAPTION>
                                                                       CASTLE TRANSMISSION SERVICES
                                    BBC HOME SERVICE TRANSMISSION             (HOLDINGS) LTD
                               --------------------------------------- -----------------------------
                                                                       PERIOD FROM    PERIOD FROM
                                     YEARS ENDED         PERIOD FROM   FEBRUARY 28,     APRIL 1,
                                      MARCH 31,         APRIL 1, 1996      1997           1997
                               ----------------------- TO FEBRUARY 27, TO MARCH 31, TO SEPTEMBER 30,
                                  1995        1996          1997           1997           1997
                          NOTE ----------- ----------- --------------- ------------ ----------------
                               (Pounds)000 (Pounds)000   (Pounds)000   (Pounds)000    (Pounds)000
                                                                                      (UNAUDITED)
<S>                       <C>  <C>         <C>         <C>             <C>          <C>
Cash inflow from
 operating activities...   21     13,956      24,311        26,427          5,756         18,305
Returns on investment
 and servicing of
 finance................   22        --          --            --            (885)        (2,577)
Capital expenditure and
 financial investments..   22    (31,549)    (17,190)      (20,092)          (748)        (8,863)
Acquisitions and
 disposals..............   22        --          --            --        (251,141)          (330)
                                 -------     -------       -------       --------       --------
Cash inflow/(outflow)...         (17,593)      7,121         6,335       (247,018)         6,535
Financing...............   22
Net increase/(decrease)
 in corporate funding...          17,593      (7,121)       (6,335)           --             --
Issuance of shares......             --          --            --         102,348            550
Increase/(decrease) in
 debt...................             --          --            --         154,358        (12,961)
                                 -------     -------       -------       --------       --------
                                  17,593      (7,121)       (6,335)       256,706        (12,411)
                                 -------     -------       -------       --------       --------
Increase/(decrease) in
 cash...................             --          --            --           9,688         (5,876)
                                 =======     =======       =======       ========       ========
Reconciliation of net
 cash flow to movement
 in net debt............   23
Increase/(decrease) in
 cash in the period.....             --          --            --           9,688         (5,876)
Cash inflow/(outflow)
 from
 increase/(decrease) in
 debt...................             --          --            --        (154,358)        12,961
                                 -------     -------       -------       --------       --------
Movement in net debt in
 the period.............             --          --            --        (144,670)         7,085
Net debt at beginning of
 the period.............             --          --            --             --        (144,670)
                                 -------     -------       -------       --------       --------
Net debt at end of the
 period.................             --          --            --        (144,670)      (137,585)
                                 =======     =======       =======       ========       ========
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                      F-58
<PAGE>
 
         CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                   THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
             CONSOLIDATED RECONCILIATION OF MOVEMENTS IN CORPORATE
                          FUNDING/SHAREHOLDERS' FUNDS
 
<TABLE>
<CAPTION>
                                                                 CASTLE TRANSMISSION SERVICES
                              BBC HOME SERVICE TRANSMISSION             (HOLDINGS) LTD
                         --------------------------------------- -----------------------------
                                                                 PERIOD FROM
                                                   PERIOD FROM   FEBRUARY 28,   PERIOD FROM
                          YEARS ENDED MARCH 31    APRIL 1, 1996      1997      APRIL 1, 1997
                         ----------------------- TO FEBRUARY 27, TO MARCH 31, TO SEPTEMBER 30,
                            1995        1996          1997           1997           1997
                         ----------- ----------- --------------- ------------ ----------------
                         (Pounds)000 (Pounds)000   (Pounds)000   (Pounds)000    (Pounds)000
                                                                                (UNAUDITED)
<S>                      <C>         <C>         <C>             <C>          <C>
Profit/(loss) for the
 period.................    (2,605)      7,785        14,002           325         (2,882)
Net increase/(decrease)
 in corporate funding...    17,593      (7,121)       (6,335)          --             --
New share capital
 subscribed.............       --          --            --        102,348            550
                           -------     -------       -------       -------        -------
Net
 additions/(deductions)
 to corporate
 funding/shareholders'
 funds..................    14,988         664         7,667       102,673         (2,332)
Opening corporate
 funding/shareholders'
 funds..................   186,777     201,765       202,429           --         102,673
                           -------     -------       -------       -------        -------
Closing corporate
 funding/shareholders'
 funds..................   201,765     202,429       210,096       102,673        100,341
                           =======     =======       =======       =======        =======
</TABLE>
 
 
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                      F-59
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
                NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS
 
1 BASIS OF PREPARATION
 
  As used in the financial statements and related notes, the terms "Castle
Transmission" or "the Group" refers to the operations of Castle Transmission
Services (Holdings) Ltd and its subsidiary which is the successor business.
The term "Home Service" refers to the operations of the Home Service
Transmission business of the British Broadcasting Corporation ("BBC") which
was the predecessor business.
 
  These consolidated financial statements have been prepared in accordance
with generally accepted accounting principles ("GAAP") applicable in the
United Kingdom (UK) and comply with the financial reporting standards of the
Institute of Chartered Accountants in England and Wales. A summary of the
differences between UK GAAP and United States (US) GAAP as applicable to
Castle Transmission is set out in Note 27.
 
  Castle Transmission Services (Holdings) Ltd ("the Company") was incorporated
on August 27, 1996 and did not trade in the period to February 27, 1997. The
Company's subsidiary, Castle Transmission International Ltd ("CTI"), was
incorporated by the BBC on May 9, 1996 and did not trade in the period to
February 27, 1997. On February 27, 1997, the assets and liabilities of Home
Service were transferred to CTI. On February 28, 1997 CTI was acquired by the
Company. During the period between August 27, 1996 and February 27, 1997
Castle Transmission did not trade and received no income and incurred no
expenditure. Accordingly the consolidated profit and loss account for Castle
Transmission represents the trading of Castle Transmission for the period from
February 28, 1997 to March 31, 1997.
 
  The financial statements for the two years ended March 31, 1995 and 1996 and
the period from April 1, 1996 to February 27, 1997 represent the profit and
loss accounts, balance sheets, and the cash flow statements of Home Service.
They have been prepared from the separate financial records and management
accounts of Home Service.
 
  Home Service was charged a management fee by the BBC representing an
allocation of certain costs including pension, information technology,
occupancy and other administration costs which were incurred centrally by the
BBC but which were directly attributable to Home Service. Management believes
such allocation is reasonable. Such costs are based on the pension arrangement
and the cost structure of the BBC and are not necessarily representative of
such costs of Castle Transmission under separate ownership.
 
  Home Service did not incur any costs in relation to financing as necessary
funding was provided from the BBC through the corporate funding account. No
interest is charged by the BBC on such funds because there is no debt at BBC
which is attributable to Home Service.
 
  Home Service was not a separate legal entity and therefore was not directly
subject to taxation on its results. The BBC is a not-for-profit organisation
and is not subject to taxation except to the extent of activities undertaken
with the objective of making a profit, including all external activities
(principally site sharing and commercial projects). The tax charge
attributable to Home Service has been calculated as if Home Service were under
separate ownership since April 1, 1994 and as if all of its results of
operations were subject to normal taxation.
   
  Redundancy costs were incurred by the BBC which related to Home Service
staff. The redundancy costs amounted to (Pounds)3.7m in 1995, (Pounds)1.1m in
1996 and (Pounds)0.6m in the period from April 1, 1996 to February 27, 1997.
The redundancy programmes were controlled by the BBC and the costs were not
recharged to Home Service. No adjustment has been made in the Home Service
financial statements for these costs because any costs incurred would have
been reflected in the cost base of Home Service, and as described in note 25
would have been off-set by an increase in turnover from the BBC.     
 
                                     F-60
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
2 ACCOUNTING POLICIES
 
  The following accounting policies have been applied consistently in dealing
with items which are considered material in relation to the financial
statements of Home Service and the consolidated financial statements of Castle
Transmission.
 
 Basis of consolidation
 
  The consolidated financial statements include the financial statements of
the Company and its subsidiary made up to March 31, 1997 after elimination of
all significant inter-company accounts and transactions. The acquisition
method of accounting has been adopted. Under this method, the results of
subsidiaries acquired or disposed of in the period are included in the
consolidated profit and loss account from the date of acquisition or up to the
date of disposal.
 
 Goodwill
 
  Purchased goodwill on acquisitions (representing the excess of the fair
value of the consideration given over the fair value of the separable net
assets acquired) is capitalised and amortised over 20 years, the period over
which the Directors consider that the Group will derive economic benefits.
 
 Tangible fixed assets and depreciation
 
  Depreciation is provided to write off the cost or valuation less the
estimated residual value of tangible fixed assets by equal instalments over
their estimated useful economic lives as follows:
 
 Land and buildings
 
<TABLE>
<CAPTION>
                                             HOME SERVICE  CASTLE TRANSMISSION
                                            -------------- -------------------
   <S>                                      <C>            <C>
   Freehold and long leasehold buildings...       50 years         50 years
   Freehold and long leasehold
    improvements...........................       20 years         20 years
   Short leasehold land and buildings...... Unexpired term   Unexpired term
   No depreciation is provided on freehold
    land...................................
</TABLE>
 
 Plant and equipment
 
<TABLE>
<CAPTION>
                                               HOME SERVICE CASTLE TRANSMISSION
                                               ------------ -------------------
   <S>                                         <C>          <C>
   Transmitters and power plant...............    25 years         20 years
   Electric and mechanical infrastructure..... 10-20 years      10-20 years
   Other plant and machinery..................  3-10 years       3-10 years
   Computer equipment.........................     5 years          5 years
</TABLE>
 
  Strategic spares, which comprise those spares that are vital to the
operation of the transmission system, are included in the capitalised value of
the asset to which they relate and are depreciated over the life of the asset.
 
  Assets under construction are included within fixed assets. The associated
labour costs are capitalised using a predetermined labour rate, and any over
or under recoveries are recognised in the profit and loss account in the
period in which they arise.
 
                                     F-61
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
 Foreign currencies
 
  Transactions in foreign currencies are translated at the rate of exchange
ruling at the date of the transaction. Monetary assets and liabilities, to the
extent that they are denominated in foreign currency, are retranslated at the
rate of exchange ruling at the balance sheet date and gains or losses are
included in the profit and loss account.
 
 Leases
 
  Operating lease rentals are charged to the profit and loss account on a
straight line basis over the period of the lease.
 
 Pensions
 
  The majority of Castle Transmission's permanent employees are members of the
BBC Pension Scheme. The regular cost of providing benefits is charged to
operating profit over the service lives of the members of the scheme on the
basis of a constant percentage of pensionable pay. Variations from regular
cost arising from periodic actuarial valuations are allocated to operating
profit over the expected remaining service lives of the members. See note 20
for further details.
 
 Stocks
 
  Stocks held are general maintenance spares and manufacturing stocks. Stocks
are stated at the lower of weighted average cost and net realisable value.
 
 Work in progress
 
  For commercial projects, the payments on account and project costs are
recorded under creditors until a project is completed at which time the
project balances are transferred to turnover and cost of sales. Provision is
made for any losses as soon as they are foreseen.
 
 Taxation
 
  The charge for taxation is based on the profit for the period and takes into
account taxation deferred because of timing differences between the treatment
of certain items for taxation and accounting purposes. Provision is made for
deferred tax only to the extent that it is probable that an actual liability
will crystallise.
 
 Turnover
 
  Turnover represents the amounts (excluding value added tax) derived from the
provision of transmission and maintenance contracts, site sharing arrangements
and commercial projects. Revenue is recognised on the basis of contracts or as
services are provided to customers.
 
                                     F-62
<PAGE>
 
         CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                   THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
3 ANALYSIS OF TURNOVER
 
<TABLE>
<CAPTION>
                                                                      CASTLE
                                        HOME SERVICE               TRANSMISSION
                            ------------------------------------ -----------------
                                                    PERIOD FROM
                                                      APRIL 1,      PERIOD FROM
                                  YEARS ENDED         1996 TO    FEBRUARY 28, 1997
                                   MARCH 31,        FEBRUARY 27,   TO MARCH 31,
                            ----------------------- ------------ -----------------
                               1995        1996         1997           1997
                            ----------- ----------- ------------ -----------------
                            (Pounds)000 (Pounds)000 (Pounds)000     (Pounds)000
   <S>                      <C>         <C>         <C>          <C>
   BY ACTIVITY
   BBC.....................   39,920      45,704       49,903          3,982
   Other--non BBC..........   18,896      24,663       20,711          2,451
                              ------      ------       ------          -----
                              58,816      70,367       70,614          6,433
                              ======      ======       ======          =====
 
4 STAFF NUMBERS AND COSTS
 
  The average number of persons employed by the Group (including directors)
during the period, analysed by category was as follows:
 
<CAPTION>
                                                                      CASTLE
                                        HOME SERVICE               TRANSMISSION
                            ------------------------------------ -----------------
                                                    PERIOD FROM
                                  YEARS ENDED         APRIL 1,      PERIOD FROM
                                   MARCH 31,          1996 TO    FEBRUARY 28, 1997
                            ----------------------- FEBRUARY 27,   TO MARCH 31,
                               1995        1996         1997           1997
                            ----------- ----------- ------------ -----------------
   <S>                      <C>         <C>         <C>          <C>
   Operational staff.......      445         381          357            313
   Project staff...........      138         154          125            108
   Management, finance,
    personnel and other
    support services.......       61          53           70             69
                              ------      ------       ------          -----
                                 644         588          552            490
                              ======      ======       ======          =====
</TABLE>
 
  The aggregate payroll costs of these persons were as follows:
 
<TABLE>
<CAPTION>
                                                                      CASTLE
                                        HOME SERVICE               TRANSMISSION
                            ------------------------------------ -----------------
                                                    PERIOD FROM
                                  YEARS ENDED         APRIL 1,      PERIOD FROM
                                   MARCH 31,          1996 TO    FEBRUARY 28, 1997
                            ----------------------- FEBRUARY 27,   TO MARCH 31,
                               1995        1996         1997           1997
                            ----------- ----------- ------------ -----------------
                            (Pounds)000 (Pounds)000 (Pounds)000     (Pounds)000
   <S>                      <C>         <C>         <C>          <C>
   Wages and salaries......   16,739      15,517       14,579          1,189
   Social security costs...    1,188       1,159        1,061             76
   Other pension costs.....      571         521          491            156
                              ------      ------       ------          -----
                              18,498      17,197       16,131          1,421
                              ======      ======       ======          =====
</TABLE>
 
 
                                      F-63
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
5 (LOSS)/PROFIT ON ORDINARY ACTIVITIES BEFORE TAXATION
 
<TABLE>
<CAPTION>
                                                                       CASTLE
                                        HOME SERVICE                TRANSMISSION
                            ------------------------------------- -----------------
                                                     PERIOD FROM
                                  YEARS ENDED         APRIL 1,       PERIOD FROM
                                   MARCH 31,           1996 TO    FEBRUARY 28, 1997
                            -----------------------  FEBRUARY 27,    TO MARCH 31,
                               1995        1996         1996            1997
                            ----------- ----------- ------------- -----------------
                            (Pounds)000 (Pounds)000  (Pounds)000     (Pounds)000
   <S>                      <C>         <C>         <C>           <C>
   (LOSS/PROFIT) ON
    ORDINARY ACTIVITIES
    BEFORE TAXATION IS
    STATED AFTER CHARGING:
   Depreciation and other
    amounts written off
    tangible fixed assets:
   Owned...................   12,810      12,835       13,038           1,624
   Goodwill amortisation...                                --             195
   Hire of plant and ma-
    chinery--rentals pay-
    able under operating
    leases.................                               112              53
   Hire of other assets--
    under operating
    leases.................                               396              36
                              ======      ======       ======           =====
</TABLE>
 
  The information in respect of hire of plant and machinery and other assets
under operating leases is not available for the years ended March 31, 1995 and
1996.
 
6 REMUNERATION OF DIRECTORS
 
  There were no directors of Home Service.
 
  The directors of Castle Transmission received no emoluments for the period
February 28, 1997 to March 31, 1997. The amounts paid to third parties in
respect of directors' services were (Pounds)2,000.
 
 
7 INTEREST PAYABLE AND SIMILAR CHARGES
 
<TABLE>
<CAPTION>
                                                                          CASTLE
                                          HOME SERVICE                 TRANSMISSION
                            ---------------------------------------- -----------------
                                  YEARS ENDED         PERIOD FROM       PERIOD FROM
                                   MARCH 31,        APRIL 1, 1996 TO FEBRUARY 28, 1997
                            -----------------------   FEBRUARY 27,     TO MARCH 31,
                               1995        1996           1997             1997
                            ----------- ----------- ---------------- -----------------
                            (Pounds)000 (Pounds)000   (Pounds)000       (Pounds)000
   <S>                      <C>         <C>         <C>              <C>
   On loans and bank over-
    drafts.................      --          --            --               969
                                ===         ===           ===               ===
</TABLE>
 
  For details of Home Service financing, see Note 1 "Basis of preparation."
 
8 TAXATION
 
 Home Service
 
  There is no tax charge in respect of the results of Home Service for the
years ended March 31, 1995 and 1996 or for the period from April 1, 1996 to
February 27, 1997. As a separate legal entity subject to normal taxation, Home
Service would have capital allowances available as discussed below which would
result in
 
                                     F-64
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
taxable losses for all periods. Deferred tax assets have not been recognised
on such tax loss as management has concluded that it is not likely that the
deferred tax asset would be realised.
 
 Castle Transmission
 
  There is no tax charge in respect of the period from February 28, 1997 to
March 31, 1997. Based on an agreement with the Inland Revenue Service, Castle
Transmission will have capital allowances available on capital expenditure
incurred by Home Service and the BBC prior to the acquisition of approximately
(Pounds)179 million. The accelerated tax deductions associated with such
capital allowances result in a taxable loss for the period. Deferred tax
assets have not been recognised on such tax loss as management has concluded
that it is not likely that the deferred tax asset would be realised based on
the limited operating history of Castle Transmission.
 
9 INTANGIBLE ASSETS
 
<TABLE>
<CAPTION>
                                                                      GOODWILL
                                                                        1997
                                                                     -----------
                                                                     (Pounds)000
   <S>                                                               <C>
   Cost
   At February 28, 1997.............................................      --
   Arising on acquisition of Home Service...........................   46,768
                                                                       ------
   At March 31, 1997................................................   46,768
                                                                       ======
   Amortisation
   At February 28, 1997.............................................      --
   Charged in period................................................      195
                                                                       ------
   At March 31, 1997................................................      195
                                                                       ======
   Net book value
   At March 31, 1997................................................   46,573
                                                                       ======
</TABLE>
 
10 TANGIBLE FIXED ASSETS
 
 Home Service
 
<TABLE>
<CAPTION>
                           LAND AND    PLANT AND   COMPUTER   ASSETS UNDER
                           BUILDINGS   MACHINERY   EQUIPMENT  CONSTRUCTION    TOTAL
                          ----------- ----------- ----------- ------------ -----------
                          (Pounds)000 (Pounds)000 (Pounds)000 (Pounds)000  (Pounds)000
<S>                       <C>         <C>         <C>         <C>          <C>
(i) Year ended March 31,
 1995
Cost or valuation
At April 1, 1994........    26,449      146,430         12       24,200      197,091
Additions...............       --           --         771       30,778       31,549
Transfers...............       340       31,775        554      (32,669)         --
                            ------      -------      -----      -------      -------
At March 31, 1995.......    26,789      178,205      1,337       22,309      228,640
Depreciation
At April 1, 1994........     6,448       11,140          5          --        17,593
Charge for period.......       843       11,531        436          --        12,810
                            ------      -------      -----      -------      -------
At March 31, 1995.......     7,291       22,671        441          --        30,403
                            ------      -------      -----      -------      -------
Net book value
At March 31, 1995.......    19,498      155,534        896       22,309      198,237
                            ======      =======      =====      =======      =======
</TABLE>
 
                                     F-65
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
<TABLE>
<CAPTION>
                             LAND AND    PLANT AND   COMPUTER   ASSETS UNDER
                             BUILDINGS   MACHINERY   EQUIPMENT  CONSTRUCTION    TOTAL
                            ----------- ----------- ----------- ------------ -----------
                            (Pounds)000 (Pounds)000 (Pounds)000 (Pounds)000  (Pounds)000
   <S>                      <C>         <C>         <C>         <C>          <C>
   (ii) Year ended March
    31, 1996
   Cost or valuation
   At April 1, 1995........   26,789      178,205      1,337       22,309      228,640
   Additions...............      --           111         40       17,928       18,079
   Disposals...............      --           --      (1,325)         --        (1,325)
   Transfers...............      474       13,354        --       (13,828)         --
                              ------      -------     ------      -------      -------
   At March 31, 1996.......   27,263      191,670         52       26,409      245,394
                              ------      -------     ------      -------      -------
   Depreciation
   At April 1, 1995........    7,291       22,671        441          --        30,403
   Charge for period.......      819       12,008          8          --        12,835
   On disposal.............      --           --        (436)         --          (436)
                              ------      -------     ------      -------      -------
   At March 31, 1996.......    8,110       34,679         13          --        42,802
                              ------      -------     ------      -------      -------
   Net book value
   At March 31, 1996.......   19,153      156,991         39       26,409      202,592
                              ======      =======     ======      =======      =======
</TABLE>
 
 
<TABLE>
<CAPTION>
                             LAND AND    PLANT AND   COMPUTER   ASSETS UNDER
                             BUILDINGS   MACHINERY   EQUIPMENT  CONSTRUCTION    TOTAL
                            ----------- ----------- ----------- ------------ -----------
                            (Pounds)000 (Pounds)000 (Pounds)000 (Pounds)000  (Pounds)000
   <S>                      <C>         <C>         <C>         <C>          <C>
   (iii) Period ended
    February 27, 1997
   Cost or valuation
   At April 1, 1996........   27,263      191,670        52        26,409      245,394
   Additions...............      --            24       179        14,283       14,486
   Disposals...............      --        (1,816)      --         (1,718)      (3,534)
   Transfers...............    2,585       23,972       252       (26,809)         --
   Transfer between
    business units.........   10,824       (2,061)       (4)          612        9,371
                              ------      -------       ---       -------      -------
   At February 27, 1997....   40,672      211,789       479        12,777      265,717
                              ------      -------       ---       -------      -------
   Depreciation
   At April 1, 1996........    8,110       34,679        13           --        42,802
   Charge for period.......      807       12,158        73           --        13,038
   On disposal.............      --        (1,816)      --            --        (1,816)
   Transfers...............       46         (108)       62           --           --
   Transfers between
    business units.........    2,185         (137)       (1)          --         2,047
                              ------      -------       ---       -------      -------
   At February 27, 1997....   11,148       44,776       147           --        56,071
                              ------      -------       ---       -------      -------
   Net book value
   At February 27, 1997....   29,524      167,013       332        12,777      209,646
                              ======      =======       ===       =======      =======
</TABLE>
 
  The transfers between business units reflect transactions made between the
predecessor business and other business units of the BBC, in preparation for
the sale of Home Service. These include the transfer of the head office at
Warwick into the books of Home Service prior to the sale.
 
                                     F-66
<PAGE>
 
         CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                   THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
Castle Transmission
 
<TABLE>
<CAPTION>
                             LAND AND    PLANT AND   COMPUTER   ASSETS UNDER
                             BUILDINGS   MACHINERY   EQUIPMENT  CONSTRUCTION    TOTAL
                            ----------- ----------- ----------- ------------ -----------
                            (Pounds)000 (Pounds)000 (Pounds)000 (Pounds)000  (Pounds)000
   <S>                      <C>         <C>         <C>         <C>          <C>
   Period ended March 31,
    1997
   Cost
   On acquisition..........   30,373      163,556       332        12,777      207,038
   Additions...............      --            56       --            692          748
   Transfers...............       17           59       --            (76)         --
                              ------      -------       ---        ------      -------
   At March 31, 1997.......   30,390      163,671       332        13,393      207,786
                              ------      -------       ---        ------      -------
   Depreciation
   On acquisition..........      --           --        --            --           --
   Charge for period.......       86        1,529         9           --         1,624
                              ------      -------       ---        ------      -------
   At March 31, 1997.......       86        1,529         9           --         1,624
                              ------      -------       ---        ------      -------
   Net book value
   At March 31, 1997.......   30,304      162,142       323        13,393      206,162
                              ======      =======       ===        ======      =======
</TABLE>
 
  The net book value of land and buildings comprises:
 
<TABLE>
<CAPTION>
                                                                       CASTLE
                                                 HOME SERVICE       TRANSMISSION
                                            ----------------------- ------------
                                                        AT MARCH 31,
                                            ------------------------------------
                                               1995        1996         1997
                                            ----------- ----------- ------------
                                            (Pounds)000 (Pounds)000 (Pounds)000
   <S>                                      <C>         <C>         <C>
   Freehold................................   16,470      16,268       21,558
   Long leasehold..........................    1,597       1,540        7,468
   Short leasehold.........................    1,431       1,345        1,278
                                              ------      ------       ------
                                              19,498      19,153       30,304
                                              ======      ======       ======
</TABLE>
 
11 STOCKS
 
<TABLE>
<CAPTION>
                                                                      CASTLE
                                                HOME SERVICE       TRANSMISSION
                                           ----------------------- ------------
                                                       AT MARCH 31,
                                           ------------------------------------
                                              1995        1996         1997
                                           ----------- ----------- ------------
                                           (Pounds)000 (Pounds)000 (Pounds)000
   <S>                                     <C>         <C>         <C>
   Spares and manufacturing stocks........    1,072       1,750        807
                                              =====       =====        ===
</TABLE>
 
12 DEBTORS
 
<TABLE>
<CAPTION>
                                                                       CASTLE
                                                 HOME SERVICE       TRANSMISSION
                                            ----------------------- ------------
                                                        AT MARCH 31,
                                            ------------------------------------
                                               1995        1996         1997
                                            ----------- ----------- ------------
                                            (Pounds)000 (Pounds)000 (Pounds)000
   <S>                                      <C>         <C>         <C>
   Trade debtors...........................    5,743       3,780        7,503
   Other debtors...........................       81         212        2,259
   Prepayments and accrued income..........    1,461         722          582
                                               -----       -----       ------
                                               7,285       4,714       10,344
                                               =====       =====       ======
</TABLE>
 
 
                                      F-67
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
13 CREDITORS: AMOUNTS FALLING DUE WITHIN ONE YEAR
 
<TABLE>
<CAPTION>
                                                                       CASTLE
                                                 HOME SERVICE       TRANSMISSION
                                            ----------------------- ------------
                                                        AT MARCH 31,
                                            ------------------------------------
                                               1995        1996         1997
                                            ----------- ----------- ------------
                                            (Pounds)000 (Pounds)000 (Pounds)000
   <S>                                      <C>         <C>         <C>
   Payments on account.....................      383         426          347
   Trade creditors.........................    2,411         872        4,123
   Other creditors.........................      --          --         1,519
   Accruals and deferred income............    2,035       5,329        8,831
                                               -----       -----       ------
                                               4,829       6,627       14,820
                                               =====       =====       ======
</TABLE>
 
  Payments on account relate to commercial projects and are shown net in the
financial statements. The gross billings amount to (Pounds)4,332,000 in 1995,
(Pounds)3,222,000 in 1996 and (Pounds)3,836,000 in 1997. The related gross
costs amounted to (Pounds)3,949,000 in 1995, (Pounds)2,796,000 in 1996 and
(Pounds)3,489,000 in 1997.
 
14 CREDITORS: AMOUNTS FALLING DUE AFTER MORE THAN ONE YEAR
 
<TABLE>
<CAPTION>
                                                                       CASTLE
                                                                    TRANSMISSION
                                                                    ------------
                                                                    AT MARCH 31,
                                                                        1997
                                                                    ------------
                                                                    (Pounds)000
   <S>                                                              <C>
   Bank loans and overdrafts.......................................   154,358
                                                                      =======
   Debts can be analysed as falling due:
   in one year or less, or on demand...............................       --
   between one and two years.......................................     7,244
   between two and five years......................................    29,160
   in five years or more...........................................   117,954
                                                                      -------
                                                                      154,358
                                                                      =======
</TABLE>
 
  Included within bank loans and overdrafts is an amount of (Pounds)3,142,000
representing finance costs deferred to future accounting periods in accordance
with FRS4.
 
  On February 28, 1997 the Group entered into term and revolving loan
facilities with a syndicate of banks. There are three facilities. Facility A
and Facility B are (Pounds)122,500,00 and (Pounds)35,000,000 term loan
facilities. Facility A is repayable in instalments, the last of which is due
in June 2004, and Facility B is repayable in two instalments in December 2004
and June 2005. These facilities were made available to finance the amount owed
to the BBC on the acquisition of the Home Service transmission business and
were drawn down in full on February 28, 1997.
 
  The third facility, Facility C, is a (Pounds)5,000,000 revolving loan
facility maturing in June 2005 under which advances are to be made to the
Group to finance its working capital requirements and for general corporate
purposes. This facility was undrawn at March 31, 1997.
 
  Borrowings under the facilities are secured by fixed and floating charges
over substantially all of the assets and undertakings of the Group and bear
interest at 2.25 per cent. above LIBOR for Facility B and between 0.875 per
cent. and 1.75 per cent. above LIBOR (depending on the annualised debt
coverage and the outstanding percentage of the facilities) for Facilities A
and C.
 
  Details of changes subsequent to the year end are included in note 26.
 
                                     F-68
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
15 PROVISION FOR LIABILITIES AND CHARGES
 
  Home Service did not make any provisions for liabilities and charges. On the
acquisition by Castle Transmission, a provision was established for costs
associated with the split of the BBC transmission business between Home
Service and World Service comprising redundancy costs and costs relating to
the relocation and reorganisation of shared sites. No payments or additional
provisions were made in the one month period and the balance on acquisition
and at March 31, 1997 was (Pounds)1,723,000.
 
16 SHARE CAPITAL
 
<TABLE>
<CAPTION>
                                                       NUMBER     AT MARCH 31,
                                                     OF SHARES        1997
                                                   -------------- ------------
                                                           (Pounds)000
   <S>                                             <C>            <C>
   Authorised
   Equity: Ordinary Shares of 1 pence each........     11,477,290       115
   Non-equity: Redeemable Preference Shares of 1
    pence each.................................... 11,465,812,710   114,658
                                                   --------------   -------
                                                   11,477,290,000   114,773
                                                   ==============   =======
   Allotted, called up and fully paid
   Equity: Ordinary Shares of 1 pence each........     10,234,790       102
   Non-equity: Redeemable Preference Shares of 1
    pence each.................................... 10,224,555,210   102,246
                                                   --------------   -------
                                                   10,234,790,000   102,348
                                                   ==============   =======
</TABLE>
 
  On incorporation the Company had an authorised share capital of 100 Ordinary
Shares of (Pounds)1 each of which 1 share was allotted, called up and fully
paid.
 
  On January 23, 1997, the 100 issued and unissued Ordinary Shares of
(Pounds)1 each were subdivided into ordinary shares of 1 pence each and the
authorised share capital of the Company was increased to (Pounds)114,772,900
by the creation of 11,467,290 additional Ordinary Shares of 1 pence each and
by the creation of 11,465,812,710 Redeemable Preference Shares of 1 pence
each.
 
  On February 28, 1997 the Company issued for cash a further 10,234,690
Ordinary Shares of 1 pence each at par and 10,224,555,210 Redeemable
Preference Shares of 1 pence each at par.
 
  The Redeemable Preference Shares are redeemable on December 31, 2050. The
Company may also redeem any number of Redeemable Preference Shares at any time
by giving at least two business days' notice in writing to the holders. In
addition, the Company shall redeem in full all the Redeemable Preference
Shares on or before the earlier or any listing or sale of 85.5 per cent. or
more of the issued share capital. No premium is payable on redemption.
 
  The holders of the Redeemable Preference Shares are entitled to receive a
dividend in respect of periods from January 1, 2004 at a rate of 5 per cent.
per annum. Dividends shall accrue on a daily basis and shall, unless the
Company is prohibited from paying dividends by the Companies Act 1985 or is
not permitted by any financing agreement to which it is a party to pay such
dividend, become a debt due from and payable to the holders of the Redeemable
Preference Shares on January 1 each year January 1, 2005.
 
  In accordance with FRS4: Capital Instruments, a finance cost has been
calculated to result in a constant rate of return over the period and carrying
amount for these Redeemable Preference Shares and has been included in the
profit and loss account as an appropriation.
 
 
                                     F-69
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
  On a winding up of the Company, the holders of the Redeemable Preference
Shares would be entitled, in priority to any payment to the holders of the
Ordinary Shares, to receive an amount equal to the nominal amount paid up on
each Redeemable Preference Share together with all arrears and accruals of the
preferential dividend payable thereon, whether or not such dividend has become
due and payable.
 
  The holders of the Redeemable Preference Shares have no right to vote at any
general meeting of the Company.
 
  At March 31, 1997 two of the shareholders held share warrants which entitled
them to a maximum of 772,500 Ordinary Shares and 771,727,500 Redeemable
Preference Shares issued at par. These are subject to adjustment in accordance
with the conditions set out in the warrant instrument which relate to any
reorganisation of the Company's share capital. The rights under the share
warrants can be exercised by giving 7 days' notice to the Company. The rights
lapse on the earliest of the following dates: the date of a listing of any
part of the share capital on the Official List of the London Stock Exchange or
any other stock exchange; the date of any sale of 85 per cent. or more of the
issued share capital of the Company; the date on which the Company goes into
liquidation; and February 28, 2007.
 
17 RESERVES
 
<TABLE>
<CAPTION>
                                                                     CASTLE
                                                                  TRANSMISSION
                                                                 ---------------
                                                                 PROFIT AND LOSS
                                                                     ACCOUNT
                                                                 ---------------
                                                                   (Pounds)000
   <S>                                                           <C>
   At February 28, 1997.........................................       --
   Retained profit for the period...............................         7
   Additional finance cost of non-equity shares.................       318
                                                                       ---
   At March 31, 1997............................................       325
                                                                       ===
</TABLE>
 
18 ACQUISITION
 
  On February 28, 1997 the Company acquired the entire share capital of CTI.
CTI had itself acquired the assets and liabilities of Home Service on February
27, 1997, with the intention of CTI's ensuing disposal to the Company.
 
  As the two transactions were enacted for the purpose of the sale and
purchase of Home Service, a provisional fair value exercise was performed by
CTI on the acquisition of the trade and net assets of Home Service on 27
February 1997, giving rise to acquisition goodwill of (Pounds)39.6 million. As
a result, no further fair value adjustments were required on the acquisition
of CTI by the Company.
 
  The fair value exercise was only provisional as the elapsed time has not
been sufficient to form a final judgement on the fair value adjustments.
 
  The consideration paid for the acquisition of the shares of CTI by the
Company amounted to (Pounds)45 million plus fees of (Pounds)7.2 million, which
gave rise to additional goodwill of (Pounds)7.2 million.
 
                                     F-70
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
  In addition, the BBC was paid (Pounds)199 million by CTI as a repayment of
the loan made by the BBC on the transfer of the assets and liabilities of Home
Service. The total consideration paid by the Group amounted to (Pounds)244
million (excluding fees), which resulted in total goodwill in the Consolidated
Financial Statements of (Pounds)46.8 million. This goodwill has been
capitalised and will be written off over 20 years, the period over which the
Directors consider that the Group will derive economic benefits.
 
19 COMMITMENTS
 
  (a) Capital commitments at the end of the financial period for which no
provision has been made, were as follows:
 
<TABLE>
<CAPTION>
                                                                       CASTLE
                                                 HOME SERVICE       TRANSMISSION
                                            ----------------------- ------------
                                                        AT MARCH 31,
                                            ------------------------------------
                                               1995        1996         1997
                                            ----------- ----------- ------------
                                            (Pounds)000 (Pounds)000 (Pounds)000
   <S>                                      <C>         <C>         <C>
   Contracted..............................   14,405       4,192       4,785
   Authorised but not contracted...........   10,219       7,969       6,490
                                              ======       =====       =====
</TABLE>
 
  (b) Annual commitments under non-cancellable operating leases were as
follows:
 
<TABLE>
<CAPTION>
                                                                 CASTLE
                                                              TRANSMISSION
                                                         -----------------------
                                                              AT 31 MARCH,
                                                                  1997
                                                         -----------------------
                                                          LAND AND
                                                          BUILDINGS     OTHER
                                                         ----------- -----------
                                                         (Pounds)000 (Pounds)000
   <S>                                                   <C>         <C>
   Operating leases which expire:
   Within one year......................................     112         266
   In the second to fifth years inclusive...............     143         628
   Over five years......................................     437         --
                                                             ---         ---
                                                             692         894
                                                             ===         ===
</TABLE>
 
20 PENSION SCHEME
 
 Home Service
 
  Home Service participated in a multi-employer pension scheme operated by the
BBC. The scheme is a defined benefit scheme whereby retirement benefits are
based on the employees' final remuneration and length of service and is funded
through a separate trustee administered scheme. Contributions to the scheme
are based on pension costs for all members of the scheme across the BBC and
are made in accordance with the recommendations of independent actuaries who
value the scheme at regular intervals, usually triennially. Pension scheme
assets are not apportioned between different parts of the BBC.
 
  The pension rate charged to Home Service was 4.5% for the two years ended
March 31, 1995 and 1996 and for the period from April 1, 1996 to February 27,
1997. This charge took into account the surplus shown by the last actuarial
valuation of the BBC scheme. Amounts charged were as follows: (Pounds)571,000
in 1995; (Pounds)521,000 in 1996 and (Pounds)491,000 in the period from April
1, 1996 to February 27, 1997.
 
 
                                     F-71
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 Castle Transmission
 
  The pension charge is not comparable between Home Service and Castle
Transmission due to the former having a reduced charge as a result of the
surplus in the BBC Pension scheme.
 
  Under the terms of the sale agreement Castle Transmission was temporarily
participating in the BBC Pension Scheme until July 31, 1997. From August 1,
1997 the Company was committed under the sale agreement to establish its own
pension scheme.
 
  In respect of past service benefits, members were able to choose between
transferring past service benefits to the Group scheme or leaving them in the
BBC Pension scheme. To the extent that past service benefits were transferred,
the BBC Pension scheme made a full transfer payment to the Group scheme
calculated in accordance with the actuarial basis as set out in the sale
agreement.
 
  The pension charge for the period from February 28, 1997 to March 31, 1997
included in the accounts represents contributions payable to the BBC Pension
Scheme and amounted to (Pounds)156,000. Contributions are calculated at the
employers' contribution rate of 17.7 per cent of pensionable salary. The
contribution rate has been determined by a qualified actuary and is specified
in the sale agreement.
 
  There were no outstanding or prepaid contributions at either the beginning
or end of the financial period.
 
  At August 1, 1997 Castle Transmission established its own pension scheme.
This is a defined benefit scheme and assets were transferred from the BBC
Pension Scheme to the extent that members chose to transfer past benefits.
From August 1, the Castle Transmission Pension Scheme will be liable in
respect of future pension benefits.
 
21 RECONCILIATION OF OPERATING PROFIT TO OPERATING CASH FLOWS
 
<TABLE>
<CAPTION>
                                                                           CASTLE
                                         HOME SERVICE                   TRANSMISSION
                            --------------------------------------- ---------------------
                                  YEARS ENDED         PERIOD FROM      PERIOD FROM
                                   MARCH 31,         APRIL 1, 1996  FEBRUARY 28, 1997
                            ----------------------- TO FEBRUARY 27,   TO MARCH 31,
                               1995        1996          1997             1997
                            ----------- ----------- --------------- -----------------
                            (Pounds)000 (Pounds)000   (Pounds)000      (Pounds)000
   <S>                      <C>         <C>         <C>             <C>               
   Operating profit........   (2,605)      7,785        14,002            1,245
   Depreciation and
    amortisation charge....   12,810      12,835        13,038            1,819
   Decrease/(Increase) in
    stocks.................      745        (678)          294               (2)
   Decrease/(Increase) in
    debtors................    1,617       2,571          (258)          (5,372)
   (Decrease)/Increase in
    creditors..............    1,389       1,798          (649)           8,066
                              ------      ------        ------           ------
   Cash inflow from
    operating activities...   13,956      24,311        26,427            5,756
                              ======      ======        ======           ======
</TABLE>
 
 
                                     F-72
<PAGE>
 
         CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                   THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
22 ANALYSIS OF CASH FLOWS FOR HEADINGS NOTED IN THE CASH FLOW STATEMENT
 
<TABLE>
<CAPTION>
                                        HOME SERVICE                 CASTLE TRANSMISSION
                          ----------------------------------------- ----------------------
                                YEARS ENDED       PERIOD FROM APRIL    PERIOD FROM
                                 MARCH 31,            1, 1996 TO     FEBRUARY 28, 1997
                          -----------------------    FEBRUARY 27,      TO MARCH 31,
                             1995        1996           1997               1997
                          ----------- ----------- ----------------- ------------------
                          (Pounds)000 (Pounds)000    (Pounds)000       (Pounds)000
<S>                       <C>         <C>         <C>               <C>                
RETURNS ON INVESTMENT
 AND SERVICING OF
 FINANCE
Interest received.......        --          --             --                  49
Interest paid...........        --          --             --                (934)
                            -------     -------        -------           --------
Net cash outflow for
 returns on investment
 and servicing of
 finance................        --          --             --                (885)
                            =======     =======        =======           ========
CAPITAL EXPENDITURE AND
 FINANCIAL INVESTMENTS
Purchase of tangible
 fixed assets...........    (31,549)    (18,079)       (21,810)              (748)
Proceeds on disposal of
 tangible fixed assets..        --          889          1,718                --
                            -------     -------        -------           --------
Net cash outflow for
 capital expenditure and
 financial investments..    (31,549)    (17,190)       (20,092)              (748)
                            =======     =======        =======           ========
ACQUISITIONS AND
 DISPOSALS
Purchase of subsidiary
 undertaking (see note
 24)....................        --          --             --             (52,141)
Amount paid to BBC on
 acquisition............        --          --             --            (199,000)
                            -------     -------        -------           --------
Net cash outflow for
 acquisition and
 disposals..............        --          --             --            (251,141)
                            =======     =======        =======           ========
FINANCING
Issue of shares.........        --          --             --             102,348
Increase/(decrease) in
 corporate funding......     17,593      (7,121)        (6,335)               --
Debt due beyond a year:
new secured loan
 repayable in
 instalments up to
 2004...................        --          --             --             120,056
new secured loan
 repayable in
 instalments up to
 2005...................        --          --             --              34,302
                            -------     -------        -------           --------
Net cash inflow from
 financing..............     17,593      (7,121)        (6,335)           256,706
                            =======     =======        =======           ========
 
</TABLE>
23 ANALYSIS OF NET DEBT DUE AFTER ONE YEAR
 
 
<TABLE>
<CAPTION>
                                        AT FEBRUARY 27,             AT MARCH 31,
                                             1996        CASHFLOW       1997
                                        --------------- ----------- ------------
                                          (Pounds)000   (Pounds)000 (Pounds)000
   <S>                                  <C>             <C>         <C>
   Cash at bank and in hand............       --            9,688        9,688
   Debt due after 1 year...............       --         (154,358)    (154,358)
                                              ---        --------     --------
                                              --         (144,670)    (144,670)
                                              ===        ========     ========
</TABLE>
 
                                      F-73
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
24 PURCHASE OF SUBSIDIARY UNDERTAKING
 
<TABLE>
<CAPTION>
                                                                        1997
                                                                     -----------
                                                                     (Pounds)000
   <S>                                                               <C>
   Net assets acquired:
     Tangible fixed assets..........................................   207,038
     Stocks.........................................................       119
     Debtors........................................................     4,972
     Creditors--trade...............................................    (6,033)
           --owed to BBC on acquisition.............................  (199,000)
     Provisions.....................................................    (1,723)
                                                                      --------
     Adjusted net assets acquired...................................     5,373
     Goodwill.......................................................    46,768
                                                                      --------
     Cost of acquisition including related fees.....................    52,141
                                                                      ========
   Satisfied by:
     Cash...........................................................    52,141
                                                                      ========
</TABLE>
 
  The total consideration paid by Castle Transmission included the assumption
and subsequent repayment of (Pounds)199 million paid to the BBC, see note 18.
 
  Under the terms of the sale agreement any claims in respect of contingent
liabilities for the years ended March 31, 1995 and March 31, 1996 and the
period between April 1, 1996 and February 27, 1997 rest with the BBC.
 
25 RELATED PARTY DISCLOSURES
 
 Home Service
 
  Throughout the two year period ended March, 31 1996 and the period from
April 1, 1996 to February 27, 1997, Home Service entered into a number of
transactions with other parts of the BBC. Substantially all of these
transactions are exempt from the disclosure provisions of FRS 8 "Related Party
Disclosures" as they have been undertaken between different parts of the BBC,
and are eliminated in the consolidated accounts of the BBC. However, brief
details of the nature of these transactions are set out below.
 
  The majority of Home Service's income arises from trading with other parts
of the BBC. Prices are set at BBC group level on the basis of cost budgets
prepared by Home Service. The aggregate value of such sales in each of the
years covered by the combined financial statements is given in Note 3.
 
  Administrative costs include expenses re-charged to Home Service by the BBC.
These re-charges related to costs incurred centrally in respect of pension,
information technology, occupancy and other administration costs. These
charges amounted to (Pounds)5.6 million in 1995, (Pounds)5.8 million in 1996
and (Pounds)1.2 million in the period between April 1, 1996 and February 27,
1997. The reduced charge for the period to February 27, 1997 is a result of
more functions being carried out by employees of Home Service in preparation
for the change to a stand alone entity.
 
  In addition, re-charges were also made for distribution costs relating to
telecommunication links between the BBC and the transmitting stations and
these were then internally re-charged to other parts of the BBC. The charges
amounted to (Pounds)6 million in 1995, (Pounds)5.6 million in 1996 and
(Pounds)6.4 million in the period between April 1, 1996 and February 27, 1997.
 
 
                                     F-74
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 Castle Transmission
 
  The Shareholders of Castle Transmission are:
 
  Crown Castle International Corp. ("CCIC"), Candover Investments plc and
funds managed by it ("Candover"), TeleDiffusion de France International S.A
("TDF") and Berkshire Partners LLC and funds managed by it ("Berkshire"). They
are considered to be related parties as they are the consortium who own 100%
of the shares of the company.
 
  Castle Transmission paid fees to shareholders in respect of expenses
incurred during the acquisition and success fees. Castle Transmission also has
management agreements with CCIC (for commercial and financial advice and
training and consultancy) and TDF (for technical advice and consulting), these
agreements run for five years from February 28, 1997. Fees are payable on the
basis of an annual fee for agreed services provided to Castle Transmission,
together with fees on a commercial arm's length basis for any additional
services provided. In addition Castle Transmission has agreed to reimburse
shareholders' expenses in relation to attendance at board meetings. The
amounts paid and accrued during the period were as follows:
 
<TABLE>
<CAPTION>
                                                              TOTAL AMOUNTS
                                                               PAYABLE AT
                            AMOUNTS     AMOUNTS     AMOUNTS     MARCH 31,
   RELATED PARTY           EXPENSED   CAPITALISED    PAID          1997
   -------------          ----------- ----------- ----------- ------------- 
                          (Pounds)000 (Pounds)000 (Pounds)000  (Pounds)000
   <S>                    <C>         <C>         <C>         <C>           
   CCIC..................      20        1,763       1,763          20
   Candover..............       1          244         244           1
   TDF...................     --           129         --          129
   Berkshire.............       1          315         316         --
                              ---        -----       -----         ---
                               22        2,451       2,323         150
                              ===        =====       =====         ===
</TABLE>
 
 Ongoing BBC relationship
 
  At the time of the acquisition of Home Service, Castle Transmission entered
into a ten year transmission contract with the BBC for the provision of
domestic terrestrial analogue television and radio transmission services
expiring on March 31, 2007. Thereafter, the contract continues until
terminated by twelve months notice by either party on March 31 in any contract
year from and including March 31, 2007. It may also be terminated early if
certain conditions are met.
 
  The contract provides for charges of approximately (Pounds)46 million to be
payable by the BBC to Castle Transmission for the year to March 31, 1998.
Castle Transmission's charges for subsequent years of the contract are largely
determined by a formula which escalates the majority of the charges by a
factor which is 1% below the rate of increase in the Retail Price Index over
the previous calendar year. Those elements of the charges which are subject to
the escalation formula for the contract year commencing April 1, 1998 amount
to approximately (Pounds)46 million.
 
26 POST BALANCE SHEET EVENTS
 
  On April 9, 1997 the Group established a subsidiary Castle Transmission
(Finance) plc ("CTF") whose purpose was to act as the finance company for the
Group. On May 22, 1997 CTF issued and Castle Transmission guaranteed
(Pounds)125 million 9% bonds due 2007 (the "Guaranteed Bonds"). The purpose of
the Guaranteed Bonds was to convert (Pounds)121.5 million of CTI's
(Pounds)157.5 million bank loans to fixed debt. Concurrent with the issuance
of the Guaranteed Bonds, all of the existing bank loans were replaced by a
(Pounds)64 million revolving loan facility
 
                                     F-75
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THF BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
available until 2002 (the "New Facility"). The company has repaid a further
(Pounds)12.5 million from cash available reducing the New Facility to
(Pounds)24 million.
 
  As a result of the issuance of the Guaranteed Bonds and the New Facility,
deferred financing costs of (Pounds)1.9 million were charged to the profit and
loss account in May 1997.
 
27 SUMMARY OF DIFFERENCES BETWEEN UNITED KINGDOM AND UNITED STATES GENERALLY
ACCEPTED ACCOUNTING PRINCIPLES
 
  These consolidated financial statements have been prepared in accordance
with UK GAAP, which differ in certain respects from US GAAP. The differences
that affect Home Service and Castle Transmission are set out below:
 
  (A) TANGIBLE FIXED ASSETS
 
  During 1993 Home Service revalued upwards its investments in certain
identifiable tangible fixed assets. Such upward revaluation is not permissible
under US GAAP. Rather, depreciated historical cost must be used in financial
statements prepared in accordance with US GAAP.
 
  In the period between April 1, 1996 and February 27, 1997 there were a
number of transfers of fixed assets to and from other parts of the BBC as
explained in note 10. For US GAAP purposes these transfers have been accounted
for under the as-if-pooling-of-interests method for transactions between
entities under common control.
 
  (B) DEFERRED TAXATION
 
  Under UK GAAP, deferred taxes are accounted for to the extent that it is
considered probable that a liability or asset will crystallise in the
foreseeable future. Under US GAAP, deferred taxes are accounted for on all
timing differences and a valuation allowance is established in respect of
those deferred tax assets where it is more likely than not that some portion
will remain unrealised. Deferred tax also arises in relation to the tax effect
of other US GAAP adjustments.
 
  (C) CAPITALISED INTEREST
 
  Under US GAAP, interest incurred during the construction periods of tangible
fixed assets is capitalised and depreciated over the life of the assets.
 
  (D) REDEEMABLE PREFERENCE SHARES
 
  Under UK GAAP, preference shares with mandatory redemption features or
redeemable at the option of the security holder are classified as a component
of total shareholders' funds. US GAAP requires such redeemable preference
shares to be classified outside of shareholders' funds.
 
  (E) CASH FLOW STATEMENT
 
  Under US GAAP various items would be reclassified within the consolidated
cash flow statement. In particular, interest received, interest paid and
taxation would be part of net cash flows from operating activities, and
dividends paid would be included within net cash flow from financing. In
addition, under US GAAP, acquisitions and disposals would be included as
investing activities.
 
                                     F-76
<PAGE>
 
        CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                  THE BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
  Movements in those current investments which are included under the heading
of cash under US GAAP form part of the movements entitled "Management of
liquid resources" in the consolidated cash flow statements.
 
  Summary combined statements of cash flows for Castle Transmission prepared
in accordance with US GAAP are set out below:
 
<TABLE>
<CAPTION>
                                    HOME SERVICE              CASTLE TRANSMISSION
                             --------------------------- -----------------------------
                                                         PERIOD FROM
                                YEAR       PERIOD FROM   FEBRUARY 28,   PERIOD FROM
                                ENDED     APRIL 1, 1996      1997      APRIL 1, 1997
                              MARCH 31,  TO FEBRUARY 27, TO MARCH 31, TO SEPTEMBER 30,
                                1996          1997           1997           1997
                             ----------- --------------- ------------ ----------------
                             (Pounds)000   (Pounds)000   (Pounds)000    (Pounds)000
                                                                        (UNAUDITED)
   <S>                       <C>         <C>             <C>          <C>
   Net cash provided by
    operating activities...     24,311        28,146         4,871         15,728
   Net cash used by
    investing activities...    (17,190)      (21,811)      (52,889)        (9,193)
   Net cash (used)/provided
    by financing
    activities.............     (7,121)       (6,335)       57,706        (12,411)
                               -------       -------       -------        -------
   Net increase/(decrease)
    in cash and cash
    equivalents............        --            --          9,688         (5,876)
   Cash and cash
    equivalents at
    beginning of period....        --            --            --           9,688
                               -------       -------       -------        -------
   Cash and cash
    equivalents at end of
    period.................        --            --          9,688          3,812
                               =======       =======       =======        =======
</TABLE>
 
  The following is a summary of the approximate effect on Home Service's and
Castle Transmission's net profit and corporate funding/shareholders' funds of
the application of US GAAP.
 
<TABLE>
<CAPTION>
                                    HOME SERVICE                CASTLE TRANSMISSION
                             --------------------------- ----------------------------------
                                YEAR       PERIOD FROM      PERIOD FROM      PERIOD FROM
                                ENDED     APRIL 1, 1996  FEBRUARY 28, 1997  APRIL 1, 1997
                              MARCH 31,  TO FEBRUARY 27,   TO MARCH 31,    TO SEPTEMBER 30,
                                1996          1997             1997              1997
                             ----------- --------------- ----------------- ----------------
                             (Pounds)000   (Pounds)000      (Pounds)000      (Pounds)000
                                                                             (UNAUDITED)
   <S>                       <C>         <C>             <C>               <C>
   Net profit/(loss) as
    reported in the profit
    and loss accounts......     7,785        14,002             325             (2,882)
   US GAAP adjustments:
     Depreciation
      adjustment on
      tangible fixed
      assets...............     3,707         3,993             --                 --
     Capitalised interest..       --            --               78                320
                               ------        ------            ----             ------
   Net income/(loss) under
    US GAAP................    11,492        17,995             403             (2,562)
   Additional finance cost
    of non-equity shares...       --            --             (318)            (1,908)
                               ------        ------            ----             ------
   Net income/(loss) under
    US GAAP attributable to
    ordinary shareholders..    11,492        17,995              85             (4,470)
                               ======        ======            ====             ======
</TABLE>
 
                                     F-77
<PAGE>
 
         CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD AND SUBSIDIARY AND
                   THF BBC HOME SERVICE TRANSMISSION BUSINESS
 
          NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
<TABLE>
<CAPTION>
                                      HOME SERVICE     CASTLE TRANSMISSION
                                      ------------ ----------------------------
                                            AT MARCH 31,       AT SEPTEMBER 30,
                                      ------------------------ ----------------
                                          1996        1997           1997
                                      ------------ ----------- ----------------
                                      (Pounds)000  (Pounds)000   (Pounds)000
                                                                 (UNAUDITED)
   <S>                                <C>          <C>         <C>
   Corporate funding/shareholders'
    funds as reported in the balance
    sheets...........................   202,429      102,673        100,341
   US GAAP adjustments:
     Depreciation adjustment on
      tangible fixed assets..........   (35,945)         --             --
     Capitalised interest............       --            78            398
     Redeemable preference shares
      (including additional finance
      cost of non-equity shares).....       --      (102,564)      (105,021)
                                        -------     --------       --------
   Corporate funding/shareholders'
    funds/(deficit) under US GAAP....   166,484          187         (4,282)
                                        =======     ========       ========
</TABLE>
 
                                      F-78
<PAGE>
 
                                    PART II
 
                  INFORMATION NOT REQUIRED IN THE PROSPECTUS
 
ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
  Section 145 of the General Corporation Law of the State of Delaware ("DGCL")
provides that a corporation has the power to indemnify any director or
officer, or former director or officer, who was or is a party or is threatened
to be made a party to any threatened, pending or completed action, suit or
proceeding, whether civil, criminal, administrative or investigative (other
than an action by or in the right of the corporation) against the expenses
(including attorney's fees), judgments, fines or amounts paid in settlement
actually and reasonably incurred by them in connection with the defense of any
action by reason of being or having been directors or officers, if such person
shall have acted in good faith and in a manner reasonably believed to be in or
not opposed to the best interests of the corporation, and, with respect to any
criminal action or proceeding, provided that such person had no reasonable
cause to believe his conduct was unlawful, except that, if such action shall
be in the right of the corporation, no such indemnification shall be provided
as to any claim, issue or matter as to which such person shall have been
judged to have been liable to the corporation unless and to the extent that
the Court of Chancery of the State of Delaware (the "Court of Chancery"), or
any court in such suit or action was brought, shall determine upon application
that, in view of all of the circumstances of the case, such person is fairly
and reasonably entitled to indemnify for such expenses as such court shall
deem proper.
   
  Accordingly, the Certificate of Incorporation and the amendments thereto
dated July 2, 1996, February 19, 1997, June 16, 1997, and October 31, 1997 of
the Company (filed herewith as Exhibits 3.1 through 3.5) provide that the
Company shall, to the maximum extent permitted from time to time under the
DGCL indemnify and upon request shall advance expenses to any person who is or
was a party or is threatened to be made a party to any threatened, pending or
completed action, suit, proceeding or claim, whether civil, criminal,
administrative or investigative, by reason or the fact that he is or was or
has agreed to be a director, officer of the Company or while a director or
officer is or was serving at the request of the Company as a director,
officer, partner, trustee, employee or agent of any corporation, partnership,
joint venture, trust or other enterprise, including service with respect to
employee benefits plans, against any and all expenses (including attorney's
fees and expenses), judgments, fines, penalties and amounts paid in settlement
or incurred in connection with the investigation, preparation to defend or
defense of such action, suit, proceeding or claim; provided, however, that the
foregoing shall not require the Company to indemnify or advance expenses to
any person in connection with any action, suit, proceeding, claim or
counterclaim initiated by or on behalf of such person. Such indemnification
shall not be exclusive of other indemnification rights arising under any by-
law, agreement, vote of directors or stockholders or otherwise and shall inure
to the benefit of the heirs and legal representatives of such person.     
 
  Furthermore, a director of the Company shall not be liable to the Company or
its stockholders for monetary damages for breach of fiduciary duty as a
director, except to the extent that such exemption from liability or
limitation thereof is not permitted under the DGCL as currently in effect or
as the same may hereafter be amended.
 
  The Company's Bylaws provide that the Company shall indemnify any person who
was or is party or is threatened to be made a party to any threatened, pending
or completed action, suit or proceeding, whether civil, criminal,
administrative or investigative (other than an action by or in the right of
the Company) by reason of the fact that he is or was a director, officer,
employee or agent of the Company, or is or was serving at the request of the
Company as a director, officer, employee or agent of another corporation,
partnership, joint venture, trust or other enterprise, against expenses
(including attorney's fees), judgments, fines and amounts paid in settlement
actually and reasonably incurred by him in connection with such action, suit
or proceeding if he acted in good faith and in a manner he reasonably believed
to be in or not opposed to the best interests of the Company, and, with
respect to any criminal action or proceeding, had no reasonable cause to
believe his conduct was unlawful.
 
                                     II-1
<PAGE>
 
  The Company's Bylaws further provide that the Company shall similarly
indemnify any person who was or is a party or is threatened to be made a party
to any threatened, pending or completed action or suit by or in the right of
the corporation except that no indemnification shall be made in respect of any
claim, issue or matter as to which such person shall have been adjudged to be
liable to the Company unless and only to the extent that the Court of Chancery
or the court in which such action or suit was brought shall determine upon
application that, despite the adjudication of liability but in view of all the
circumstances of the case, such person is fairly and reasonably entitled to
indemnify for such expenses which the Court of Chancery or such other court
shall deem proper.
 
ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
  (a) Exhibits
 
<TABLE>   
<CAPTION>
 EXHIBIT
   NO.                           DESCRIPTION OF EXHIBIT
 -------                         ----------------------
 <C>     <S>
   *2.1  --Asset Purchase and Merger Agreement among Crown Network Systems,
          Inc., Crown Mobile Systems, Inc., Robert A. Crown, Barbara Crown and
          Castle Acquisition Corp. I, Castle Acquisition Corp. II, Castle Tower
          Holding Corp. dated July 11, 1997.
   *2.2  --First Amended and Restated Asset Purchase and Merger Agreement among
          Crown Network Systems, Inc., Crown Mobile Systems, Inc., Robert A.
          Crown, Barbara Crown and Castle Acquisition Corp. I, Castle
          Acquisition Corp. II, Castle Tower Holding Corp. dated July 11, 1997,
          as amended and restated on August 14, 1997.
   *2.3  --Stock Purchase Agreement by and between Castle Tower Holding Corp.,
          Bruce W. Neurohr, Charles H. Jones, Ronald J. Minnich, Ferdinand G.
          Neurohr and Terrel W. Pugh dated May 12, 1997 ("TEA Stock Purchase
          Agreement").
   *3.1  --Certificate of Incorporation of Castle Tower Holding Corp. dated
          April 26, 1995.
   *3.2  --Certificate of Amendment of Certificate of Incorporation of Castle
          Tower Holding Corp. dated July 2, 1996.
   *3.3  --Certificate of Amendment of Certificate of Incorporation of Castle
          Tower Holding Corp. dated February 19, 1997.
   *3.4  --Certificate of Amendment of Certificate of Incorporation of Castle
          Tower Holding Corp. dated June 16, 1997.
   *3.5  --Certificate of Amendment of Certificate of Incorporation of Castle
          Tower Holding Corp. dated October 31, 1997.
   *3.6  --Amended and Restated Bylaws of Castle Tower Holding Corp. dated
          February 24, 1997.
   *4.1  --Indenture between Crown Castle International Corp. and United States
          Trust Company of New York, as trustee (including exhibits).
   *4.2  --Amended and Restated Stockholders Agreement among Castle Tower
          Holding Corp., Edward C. Hutcheson, Jr., Ted B. Miller, Jr., Robert
          A. Crown and Barbara Crown and the persons listed on Schedule I
          thereto dated August 15, 1997.
    4.3  --Article Fourth of Certificate of Incorporation of Castle Tower
          Holding Corp. (included in Exhibits 3.1 through 3.5).
   *4.4  --Trust Deed related to (Pounds)125,000,000 9 per cent. Guaranteed
          Bonds due 2007 among Castle Transmission (Finance) PLC, as Issuer,
          Castle Transmission International Ltd and Castle Transmission
          Services (Holdings) Ltd., as Guarantors, and The Law Debenture Trust
          Corporation p.l.c., as Trustee, dated May 21, 1997.
   *4.5  --First Supplemental Trust Deed related to (Pounds)125,000,000 9 per
          cent. Guaranteed Bonds due 2007 among Castle Transmission (Finance)
          PLC, as Issuer, Castle Transmission International Ltd and Castle
          Transmission Services (Holdings) Ltd, as Guarantors, and The Law
          Debenture Trust Corporation p.l.c., as Trustee, dated October 17,
          1997.
   *5.   --Opinion of Cravath, Swaine & Moore.
  *10.1  --Registration Rights Agreement by and among Crown Castle
          International Corp. and Lehman Brothers Inc. and Credit Suisse First
          Boston Corporation dated as of November 25, 1997.
  *10.2  --Loan Agreement by and among Castle Tower Corporation, KeyBank
          National Association (formerly known as "Society National Bank") and
          certain lenders dated April 26, 1995 ("KeyBank Loan Agreement").
</TABLE>    
 
 
                                     II-2
<PAGE>
 
<TABLE>   
<CAPTION>
 EXHIBIT
   NO.                           DESCRIPTION OF EXHIBIT
 -------                         ----------------------
 <C>     <S>
  *10.3  --First Amendment to KeyBank Loan Agreement dated June 26, 1996.
  *10.4  --Second Amendment to KeyBank Loan Agreement dated January 17, 1997.
  *10.5  --Third Amendment to KeyBank Loan Agreement dated April 3, 1997.
  *10.6  --Fourth Amendment to KeyBank Loan Agreement dated October 31, 1997.
  *10.7  --Fifth Amendment to KeyBank Loan Agreement dated November 24, 1997.
  *10.8  --Amended and Restated Limited Holdco Guaranty by Crown Castle
          International Corp., in favor of KeyBank National Association, as
          Agent, dated November 25, 1997.
  *10.9  --Memorandum of Understanding regarding Management and Governance of
          Castle Tower Holding Corp. and Crown Communications, Inc. dated
          August 15, 1997.
 +*10.10 --Site Commitment Agreement between Nextel Communications, Inc. and
          Castle Tower Corporation dated July 11, 1997.
 +*10.11 --Independent Contractor Agreement by and between Crown Network
          Systems, Inc. and Sprint Spectrum L.P. dated July 8, 1996, including
          addendum dated November 12, 1997.
 +*10.12 --Independent Contractor Agreement between Crown Network Systems, Inc.
          and Powerfone, Inc. d/b/a Nextel Communications dated September 30,
          1996.
 +*10.13 --Independent Contractor Agreement by and between APT Pittsburgh
          Limited Partnership and Crown Network Systems, Inc. dated December 3,
          1996.
 +*10.14 --Master Lease Agreement between Sprint Spectrum, L.P. and Robert
          Crown d/b/a/ Crown Communications dated June 11, 1996 ("Sprint Master
          Lease Agreement").
   10.15 --First Amendment to Sprint Master Lease Agreement, dated July 5, 1996
          (included in Exhibit 10.14).
   10.16 --Second Amendment to Sprint Master Lease Agreement, dated January 27,
          1997 (included in Exhibit 10.14).
 +*10.17 --Master Lease Agreement between Powerfone, Inc. d/b/a/ Nextel
          Communications and Robert A. Crown d/b/a Crown Communications dated
          October 3, 1996.
 +*10.18 --Master Lease Agreement between APT Pittsburgh Limited Partnership
          and Robert Crown d/b/a Crown Communications dated December 3, 1996.
 +*10.19 --Master Tower Lease Agreement between Cellco Partnership d/b/a/ Bell
          Atlantic NYNEX Mobile, Pittsburgh SMSA, L.P. and Pennsylvania RSN No.
          6 (II) and Robert A. Crown d/b/a/ Crown Communications dated December
          29,1995, as amended by a letter agreement dated as of October 28,
          1997.
 +*10.20 --Master Tower Lease Agreement between Cellco Partnership d/b/a/ Bell
          Atlantic NYNEX Mobile, Pittsburgh SMSA, L.P. and Pennsylvania RSN No.
          6 (II) and Robert A. Crown d/b/a/ Crown Communications dated December
          29,1995, as amended by a letter agreement dated as of October 28,
          1997.
  *10.21 --Castle Tower Holding Corp. 1995 Stock Option Plan (Third
          Restatement).
  *10.22 --Services Agreement between Castle Transmission International Ltd
          (formerly known as Castle Transmission Services Ltd) and Castle Tower
          Holding Corp. dated February 28, 1997.
  *10.23 --Shareholders' Agreement among Berkshire Fund IV Investment Corp.,
          Berkshire Investors LLC, Berkshire Partners LLC, Candover Investments
          PLC, Candover (Trustees) Limited, Candover Partners Limited (as
          general partner for 4 limited partnerships), Castle Tower Holding
          Corp., TeleDiffusion de France International S.A., and Diohold
          Limited (now known as Castle Transmission Services (Holdings) Ltd)
          dated January 23, 1997.
  *10.24 --First Amendment to Amended and Restated Stockholders Agreement by
          and among Crown Castle International Corp., Edward C. Hutcheson, Jr.,
          Ted B. Miller, Jr., Robert A. Crown and Barbara Crown and the persons
          listed as Investors dated January 28, 1998.
</TABLE>    
 
 
                                      II-3
<PAGE>
 
<TABLE>   
<CAPTION>
 EXHIBIT
   NO.                           DESCRIPTION OF EXHIBIT
 -------                         ----------------------
 <C>     <S>
  *12.1  --Computation of Ratio of Earnings to Fixed Charges for Crown Castle
          International Corp.
  *12.2  --Computation of Ratio of Earnings to Fixed Charges for Crown
          Communications.
  *21.   --Subsidiaries of Crown Castle International Corp.
 **23.1  --Consent of KPMG Peat Marwick LLP.
 **23.2  --Consent of Ernst & Young LLP.
   23.3  --Consent of Cravath, Swaine & Moore (included in Exhibit 5).
 **24.   --Powers of Attorney.
  *25.   --Statement of Eligibility and Qualification under the Trust Indenture
          Act of 1939 of United States Trust Company of New York, as trustee,
          on Form T-1.
  *27.1  --Financial Data Schedule for the period ended December 31, 1996.
  *27.2  --Financial Data Schedule for the period ended September 30, 1997.
  *99.1  --Form of Letter of Transmittal.
  *99.2  --Form of Notice of Guaranteed Delivery.
  *99.3  --Form of Letter to Brokers, Dealers, Commercial Banks, Trust
          Companies and Other Nominees.
  *99.4  --Form of Letter to Clients.
  *99.5  --Form of Tax Guidelines.
</TABLE>    
- --------
   
 */Filed herewith.     
   
**/Previously filed.     
   
 + /Indicates that portions of the exhibit have been omitted pursuant to a
   request for confidential treatment and such portions have been filed with
   the Commission separately.     
All other exhibits listed above to be filed by amendment.
 
  (b) Financial Statement Schedules
 
  Schedule I -- Condensed Financial Information of Registrant
 
  All other schedules are omitted because they are not applicable or because
the required information is contained in the financial statements or notes
thereto included in this Registration Statement.
 
ITEM 22. UNDERTAKINGS
 
  The undersigned Registrant hereby undertakes that insofar as indemnification
for liabilities arising under the Securities Act of 1933 may be permitted to
directors, officers and controlling persons of the Registrant pursuant to the
foregoing provisions described under Item 20 above, or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in
Securities Act of 1933 and is, therefore, unenforceable. In the event that a
claim for indemnification against such liabilities (other than the payment by
the Registrant of expenses incurred or paid by a director, officer or
controlling person of the Registrant in the successful defense of any action,
suit or proceeding) is asserted against the Registrant by such director,
officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the
matter has been settled by controlling precedent, submit to a court of
appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Securities Act of 1933 and will be
governed by the final adjudication of such issue.
 
  The undersigned Registrant hereby undertakes to respond to requests for
information that is incorporated by reference into the Prospectus pursuant to
Item 4, 10(b), 11, or 13 of Form S-4, within one business day of receipt of
such request, and to send the incorporated documents by first class mail or
other equally prompt means. This undertaking also includes documents filed
subsequent to the effective date of the Registration Statement through the
date of responding to the request.
 
                                     II-4
<PAGE>
 
  The undersigned Registrant hereby undertakes to supply by means of a post-
effective amendment all information concerning a transaction, and the company
being acquired involved therein, that was not the subject of and included in
the Registration Statement when it became effective.
 
  The undersigned Registrant hereby undertakes as follows: that prior to any
public reoffering of the securities registered hereunder through use of a
prospectus which is a part of this Registration Statement, by any person or
party who is deemed to be an underwriter within the meaning of Rule 145(c),
the undersigned undertakes that such reoffering prospectus will contain the
information called for by the applicable registration form with respect to
reofferings by persons who may be deemed underwriters, in addition to the
information called for by the other Items of the application form.
 
  The undersigned Registrant hereby undertakes that every prospectus: (i) that
is filed pursuant to the immediately preceding paragraph or (ii) that purports
to meet the requirements of Section 10(a)(3) of the Securities Act of 1933 and
is used in connection with an offering of securities subject to Rule 415, will
be filed as a part of an amendment to the registration statement and will not
be used until such amendment is effective, and that, for purposes of
determining any liability under the Securities Act of 1933, each such post-
effective amendment shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering
thereof.
 
                                     II-5
<PAGE>
 
                                   SIGNATURES
   
  Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Houston, State of Texas,
on this 11th day of March, 1998.     
 
                                         Crown Castle International Corp.,
 
                                                /s/ Charles C. Green, III
                                         By ___________________________________
                                           CHARLES C. GREEN, III
                                           EXECUTIVE VICE PRESIDENT AND
                                         CHIEF FINANCIAL OFFICER
                                                   
  Pursuant to the requirements of the Securities Act of 1933, this Registration
Statement has been signed by the following persons in the capacities indicated
on this 11th day of March, 1998.     
 
 
                NAME                         TITLE
 
                                      Chief Executive
               *                      Officer and Vice
- ------------------------------------  Chairman of the
         TED B. MILLER, JR.           Board (Principal
                                      Executive Officer)
 
                                      President and
               *                       Director
- ------------------------------------
            DAVID L. IVY
 
     /s/ Charles C. Green, III        Executive Vice
- ------------------------------------  President and Chief
       CHARLES C. GREEN, III          Financial Officer
                                      (Principal
                                      Financial and
                                      Accounting Officer)
 
                                      Chairman of the
               *                       Board
- ------------------------------------
           CARL FERENBACH
 
                                      Director
               *     
- ------------------------------------
          ROBERT A. CROWN
 
                                      Director
               *     
- ------------------------------------
         GARTH H. GREIMANN
 
 
                                      II-6
<PAGE>
 
                                        Director
               *     
 
- -------------------------------------
                                        Director
               *     
           RANDALL A. HACK
- -------------------------------------
         DAVID C. HULL, JR.
 
                                        Director
               *     
- -------------------------------------
      EDWARD C. HUTCHESON, JR.
 
                                        Director
               *     
- -------------------------------------
          J. LANDIS MARTIN
 
                                        Director
               *     
- -------------------------------------
         ROBERT F. MCKENZIE
 
                                        Director
               *     
- -------------------------------------
          JEFFREY H. SCHUTZ
       
    /s/ Charles C. Green, III     
   
*By: ___________________________     
         
      CHARLES C. GREEN, III     
           
        ATTORNEY-IN-FACT     
 
                                      II-7
<PAGE>
 
                        CROWN CASTLE INTERNATIONAL CORP.
 
           SCHEDULE I--CONDENSED FINANCIAL INFORMATION OF REGISTRANT
 
                         BALANCE SHEET (UNCONSOLIDATED)
 
                (IN THOUSANDS OF DOLLARS, EXCEPT SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                DECEMBER 31,
                                                               ---------------
                                                                1995    1996
                            ASSETS                             ------  -------
<S>                                                            <C>     <C>
Current assets:
  Cash and cash equivalents................................... $  --   $ 6,093
  Receivables.................................................    --     1,073
  Advances to subsidiaries, net...............................    100      388
                                                               ------  -------
    Total current assets......................................    100    7,554
Investment in subsidiaries....................................  5,694    5,766
Investment in and advances to affiliates......................    --     2,101
Deferred income taxes.........................................    --        49
                                                               ------  -------
                                                               $5,794  $15,470
                                                               ======  =======
<CAPTION>
        LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
<S>                                                            <C>     <C>
Current liabilities:
  Accounts payable and accrued liabilities.................... $  --   $   130
                                                               ------  -------
    Total current liabilities.................................    --       130
Redeemable preferred stock, $.01 par value; 2,500,000 shares
 authorized:
  Series A Convertible Preferred Stock; 862,455 shares issued
   (stated at redemption and aggregate liquidation value).....  5,175    5,175
  Series B Convertible Preferred Stock; shares issued:
   December 31, 1995 -- none and December 31, 1996 -- 864,568
   (stated at redemption and aggregate liquidation value).....     --   10,375
                                                               ------  -------
    Total redeemable preferred stock..........................  5,175   15,550
                                                               ------  -------
Stockholders' equity (deficit):
  Common stock, $.01 par value; 5,270,000 shares authorized:
   Class A Common Stock; 270,000 shares issued................      3        3
   Class B Common Stock; shares issued: December 31, 1995 --
    286,666 and December 31, 1996 -- 297,666 .................      3        3
  Additional paid-in capital..................................    634      762
  Accumulated deficit.........................................    (21)    (978)
                                                               ------  -------
    Total stockholders' equity (deficit) .....................    619     (210)
                                                               ------  -------
                                                               $5,794  $15,470
                                                               ======  =======
</TABLE>
     See notes to consolidated financial statements and accompanying notes.
 
                                      S-1
<PAGE>
 
                        CROWN CASTLE INTERNATIONAL CORP.
     SCHEDULE I--CONDENSED FINANCIAL INFORMATION OF REGISTRANT (CONTINUED)
 
                    STATEMENT OF OPERATIONS (UNCONSOLIDATED)
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                                YEARS ENDED
                                                               DECEMBER 31,
                                                               --------------
                                                               1995    1996
                                                               ------ -------
<S>                                                            <C>    <C>
Interest and other income..................................... $  --   $  171
Corporate development expenses................................    --   (1,249)
                                                               -----  -------
Loss before income taxes and equity in earnings (losses) of
 subsidiaries.................................................    --   (1,078)
Credit for income taxes.......................................    --       49
Equity in earnings (losses) of subsidiaries...................   (21)      72
                                                               -----  -------
Net loss...................................................... $ (21) $  (957)
                                                               =====  =======
</TABLE>
 
 
     See notes to consolidated financial statements and accompanying notes.
 
                                      S-2
<PAGE>
 
                        CROWN CASTLE INTERNATIONAL CORP.
     SCHEDULE I--CONDENSED FINANCIAL INFORMATION OF REGISTRANT (CONTINUED)
 
                    STATEMENT OF CASH FLOWS (UNCONSOLIDATED)
 
                           (IN THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                                 YEARS ENDED
                                                                DECEMBER 31,
                                                                --------------
                                                                 1995    1996
                                                                ------  ------
<S>                                                             <C>     <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
 Net loss...................................................... $  (21) $ (957)
 Adjustments to reconcile net loss to net cash provided by
  (used for) operating activities:
  Equity in losses (earnings) of subsidiaries..................     21     (72)
  Increase in accounts payable and accrued liabilities.........    --      130
  Increase in receivables......................................    --   (1,073)
  Increase in deferred income taxes............................    --      (49)
                                                                ------  ------
    Net cash provided by (used for) operating activities.......    --   (2,021)
                                                                ------  ------
CASH FLOWS FROM INVESTING ACTIVITIES:
 Investment in and advances to affiliates......................     --  (2,101)
 Net advances to subsidiaries..................................   (100)   (288)
 Investment in subsidiaries.................................... (4,972)    --
                                                                ------  ------
    Net cash used for investing activities..................... (5,072) (2,389)
                                                                ------  ------
CASH FLOWS FROM FINANCING ACTIVITIES:
 Proceeds from issuance of capital stock.......................  5,072  10,503
                                                                ------  ------
    Net cash provided by financing activities..................  5,072  10,503
                                                                ------  ------
NET INCREASE IN CASH AND CASH EQUIVALENTS......................    --    6,093
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR.................    --      --
                                                                ------  ------
CASH AND CASH EQUIVALENTS AT END OF YEAR....................... $  --   $6,093
                                                                ======  ======
SUPPLEMENTARY SCHEDULE OF NON-CASH INVESTING AND FINANCING
 ACTIVITIES:
 Conversion of subsidiary's Convertible Secured Subordinated
  Notes to Series A Convertible Preferred Stock................ $  743  $  --
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
 Interest paid................................................. $  --   $  --
 Income taxes paid.............................................    --      --
</TABLE>
 
     See notes to consolidated financial statements and accompanying notes.
 
                                      S-3
<PAGE>
 
                       CROWN CASTLE INTERNATIONAL CORP.
 
     SCHEDULE I--CONDENSED FINANCIAL INFORMATION OF REGISTRANT (CONTINUED)
 
                NOTES TO FINANCIAL STATEMENTS (UNCONSOLIDATED)
 
1. INVESTMENT IN SUBSIDIARIES
 
  The Company's investment in subsidiaries is presented in the accompanying
unconsolidated financial statements using the equity method of accounting. CTC
is precluded from paying dividends to the Company by the terms of the Bank
Credit Agreement. The restricted net assets of CTC totaled $5,766,000 at
December 31, 1996.
 
2. INCOME TAXES
 
  Income taxes reported in the accompanying unconsolidated financial
statements are determined by computing income tax assets and liabilities on a
consolidated basis, for the Company and members of its consolidated federal
income tax return group, and then reducing such consolidated amounts for the
amounts recorded by the Company's subsidiaries on a separate tax return basis.
 
                                      S-4

<PAGE>
 

                                                            Exhibit 2.1 
===============================================================================




                       ASSET PURCHASE AND MERGER AGREEMENT

                                      among

                          CROWN NETWORK SYSTEMS, INC.,

                           CROWN MOBILE SYSTEMS, INC.,

                                ROBERT A. CROWN,

                                  BARBARA CROWN

                                       and

                           CASTLE ACQUISITION CORP. I,

                          CASTLE ACQUISITION CORP. II,

                           CASTLE TOWER HOLDING CORP.



                                  July 11, 1997


===============================================================================
<PAGE>
 
                                TABLE OF CONTENTS
<TABLE>
<CAPTION>

                                                                                               Page
                                                                                               ----
<S>                                                                                            <C> 
ARTICLE 1.  Purchase and Sale of Assets; Assumption of Liabilities................................2
   1.1. Crown Communications Assets...............................................................2
   1.2. Excluded Assets...........................................................................4
   1.3. Assumption of Certain Liabilities; Excluded Liabilities...................................4
   1.4. Advance Payment; Payment of Purchase Price................................................5
   1.5. Certain Definitions.......................................................................6

ARTICLE 2.  The Merger Transactions...............................................................6
   2.1. The Mergers Generally.....................................................................6
   2.2. Conversion of Shares......................................................................7
   2.3. Surrender and Payment.....................................................................8

ARTICLE 3.  Due Diligence Investigation...........................................................9
   3.1. Due Diligence Investigation Generally.....................................................9
   3.2. Interim Financial Statements.............................................................10

ARTICLE 4.  Closing; Deliveries of the Parties at Closing........................................10
   4.1. The Closing..............................................................................10
   4.2. Deliveries at the Closing by the Crown Parties...........................................10
   4.3. Deliveries at the Closing by Buyer.......................................................11
   4.4. Pre-Closing Deliveries...................................................................12
   4.5. Time is of the Essence...................................................................12

ARTICLE 5.  Representations and Warranties of the Crown Parties..................................13
   5.1. Corporate Status; Authority..............................................................13
   5.2. Corporate Action.........................................................................13
   5.3. Authority; Execution.....................................................................13
   5.4. No Conflicts.............................................................................14
   5.5. Capitalization of Network................................................................14
   5.6. Capitalization of Mobile.................................................................15
   5.7. Equity Interests.........................................................................15
   5.8. Title to the Crown Stock.................................................................15
   5.9. Financial Statements.....................................................................16
   5.10. No Undisclosed Liabilities..............................................................16
   5.11. Absence of Certain Changes or Events....................................................17
   5.12. Licenses................................................................................18
   5.13. Sufficiency of Assets...................................................................18
   5.14. Assets Other than Real Property Interests...............................................19
   5.15. Title to Real Property..................................................................19
   5.16. Intellectual Property...................................................................20
   5.17. Employees...............................................................................21
   5.18. Litigation..............................................................................22
</TABLE>


                                      -i-
<PAGE>
 
<TABLE>
<CAPTION>

                                                                                               Page
                                                                                               ----
<S>                                                                                            <C> 
   5.19. Brokers.................................................................................23
   5.20. Contracts...............................................................................23
   5.21. Compliance with Laws....................................................................24
   5.22. Environmental Matters...................................................................25
   5.23. Taxes...................................................................................26
   5.24. Insurance...............................................................................28
   5.25. Accounts Receivable.....................................................................28
   5.26. Securities Act..........................................................................28
   5.27. Transactions with Affiliates............................................................29
   5.28. Disclosure..............................................................................29

ARTICLE 6.  Representations and Warranties of Buyer..............................................29
   6.1. Corporate Status; Authority..............................................................29
   6.2. Corporate Action.........................................................................30
   6.3. No Conflicts.............................................................................30
   6.4. Capitalization of Buyer and its Subsidiaries and CTSH and its Subsidiaries...............31
   6.5. Equity Interests.........................................................................32
   6.6. Financial Statements.....................................................................32
   6.7. No Undisclosed Liabilities...............................................................33
   6.8. Absence of Certain Changes or Events.....................................................33
   6.9. Licenses.................................................................................34
   6.10. Assets Other than Real Property Interests...............................................34
   6.11. Title to Real Property..................................................................35
   6.12. Intellectual Property...................................................................36
   6.13. Employees...............................................................................37
   6.14. Litigation..............................................................................38
   6.15. Brokers.................................................................................38
   6.16. Contracts...............................................................................39
   6.17. Compliance with Laws....................................................................40
   6.18. Environmental Matters...................................................................41
   6.19. Taxes...................................................................................42
   6.20. Insurance...............................................................................42
   6.21. Disclosure..............................................................................43

ARTICLE 7.  Covenants of Sellers.................................................................43
   7.1. Operation of the Business................................................................43
   7.2. Consents.................................................................................46
   7.3. Notice of Proceedings....................................................................46
   7.4. No Solicitation..........................................................................46
   7.5. Cooperation..............................................................................47

ARTICLE 8.  Covenants of Buyer...................................................................47
   8.1. Operation of the Business................................................................47
   8.2. Notice of Proceedings....................................................................49
   8.3. Corporate Name and Symbol................................................................49
</TABLE>


                                     -ii-
<PAGE>
 
<TABLE>
<CAPTION>

                                                                                               Page
                                                                                               ----
<S>                                                                                            <C> 
   8.4. Liquidity Provision......................................................................49

ARTICLE 9.  Mutual Covenants of the Parties......................................................49
   9.1. Executive Compensation...................................................................49
   9.2. Hart-Scott-Rodino........................................................................50
   9.3. Access to Facilities, Files and Records..................................................50
   9.4. Advice of Changes........................................................................50
   9.5. Consummation of Agreement................................................................50
   9.6. No Solicitation of Employees.............................................................51
   9.7. Standstill...............................................................................51

ARTICLE 10.  Conditions to the Obligations of the Crown Parties..................................52
   10.1. No Buyer Material Adverse Effect; Representations and Warranties and Covenants..........52
   10.2. Proceedings.............................................................................52
   10.3. Hart-Scott-Rodino.......................................................................52
   10.4. Deliveries..............................................................................53
   10.5. Liquidity Provision.....................................................................53

ARTICLE 11.  Conditions to the Obligations of Buyer, CAC I and CAC II............................53
   11.1. No Crown Material Adverse Effect; Representations, Warranties and Covenants.............53
   11.2. Proceedings.............................................................................53
   11.3. Hart-Scott-Rodino.......................................................................54
   11.4. Deliveries..............................................................................54
   11.5. Robert A. Crown.........................................................................54

ARTICLE 12.  Survival of Representations and Warranties..........................................54
   12.1. Survival................................................................................54
   12.2. Indemnification.........................................................................54

ARTICLE 13  Tax-Related Matters..................................................................58
   13.1. Closing of Tax Year.....................................................................58
   13.2  Filing of Tax Returns...................................................................58
   13.3. Tax Audits, Etc.........................................................................59
   13.4. Tax Indemnification.....................................................................60
   13.5. Transfer Taxes, Etc.....................................................................60
   13.6. Tax Certificate.........................................................................61
   13.7. Tax Agreements..........................................................................61
   13.8. Access to Books and Records.............................................................61
   13.9. Allocation of Crown Value...............................................................61
   13.10. Survival...............................................................................62

ARTICLE 14  Miscellaneous........................................................................62
   14.1. Termination of Agreement................................................................62
   14.2  Liabilities Upon Termination............................................................62
   14.3. Expenses................................................................................63
</TABLE>


                                     -iii-
<PAGE>
 
<TABLE>
<CAPTION>

                                                                                               Page
                                                                                               ----
<S>                                                                                            <C> 
   14.4. Bulk Sales Laws.........................................................................63
   14.5. Assignments.............................................................................63
   14.6. Further Assurances......................................................................63
   14.7. Public Announcement.....................................................................64
   14.8. Notices.................................................................................64
   14.9. Captions................................................................................65
   14.10. Governing Law..........................................................................65
   14.11. Waiver of Provisions...................................................................65
   14.12. Counterparts...........................................................................65
   14.13. Entire Agreement.......................................................................65
   14.14. Confidentiality........................................................................66
   14.15. Submission to Jurisdiction; Waivers....................................................66
   14.16. Brokers or Finders.....................................................................66
   14.17. Specific Performance...................................................................66
   14.18. Definitions; Construction..............................................................67
   14.19. No Third Party Beneficiaries...........................................................67
</TABLE>


                                    EXHIBITS
                                    --------

Exhibit A                  Excluded Personal Property
Exhibit B                  Note
Exhibit C                  Buyer EBITDA
Exhibit D                  Acquired Business EBITDA
Exhibit E                  Shareholder Agreement


                                    SCHEDULES
                                    ---------

Schedule 5.4               No Conflicts - Crown
Schedule 5.7               Equity Interests - Crown
Schedule 5.9               Financial Statements - Crown
Schedule 5.11              Absence of Certain Changes - Crown
Schedule 5.12              Licenses - Crown
Schedule 5.14              Liens - Crown
Schedule 5.15              Real Property - Crown
Schedule 5.16              Intellectual Property - Crown
Schedule 5.17              Employee Matters - Crown
Schedule 5.18              Litigation - Crown
Schedule 5.20              Contracts - Crown
Schedule 5.21              Compliance With Laws - Crown
Schedule 5.22              Environmental Matters - Crown
Schedule 5.23(b)           Tax Returns - Crown
Schedule 5.23(c)           Taxing Jurisdictions - Crown
Schedule 5.24              Insurance - Crown


                                     -iv-
<PAGE>
 
Schedule 5.27              Transactions with Affiliates - Crown
Schedule 6.3               No Conflicts - Buyer
Schedule 6.4(a)            Capitalization of Buyer's Subsidiaries
Schedule 6.4(b)            Capitalization of CTSH's Subsidiaries
Schedule 6.5               Equity Interests - Buyer
Schedule 6.6(a)            Financial Statements - Buyer
Schedule 6.6(b)            Financial Statements - CTSH
Schedule 6.7               No Undisclosed Liabilities - Buyer
Schedule 6.9               Licenses - Buyer
Schedule 6.10              Liens - Buyer
Schedule 6.11              Real Property - Buyer
Schedule 6.12              Intellectual Property - Buyer
Schedule 6.13              Employee Matters - Buyer
Schedule 6.14              Litigation - Buyer
Schedule 6.16              Contracts - Buyer
Schedule 6.17              Compliance With Laws - Buyer
Schedule 6.18              Environmental Matters - Buyer
Schedule 6.20              Insurance - Buyer
Schedule 9.1               Key Employees
Schedule 13.9              Allocation of Crown Value



                                      -v-
<PAGE>
 
                              Table of Definitions
<TABLE>
<CAPTION>
Term                                                                Section
- ----                                                                -------
<S>                                                                <C> 
Acquired Business                                                       1.5
Acquisition Financing                                                   7.6
Advance Payment                                                    recitals
Affiliate                                                          14.18(a)
Assumed Contracts                                                    1.1(d)
Assumed Liabilities                                                  1.3(a)
Bank Credit Agreement                                                   6.3
BBC Agreement                                                           6.3
Benefit Plan                                                        5.17(c)
Buyer                                                              preamble
Buyer Audited Statements                                                6.6
Buyer Benefit Plan                                                  6.13(c)
Buyer's Damages                                                     12.2(a)
Buyer Environmental Audits                                          6.18(a)
Buyer Financial Statements                                              6.6
Buyer Interim Financial Statements                                   3.3(b)
Buyer Leased Property                                                  6.11
Buyer Material Adverse Effect                                           6.1
Buyer Owned Property                                                   6.11
Buyer Permitted Liens                                               6.19(a)
Buyer Properties                                                       6.11
Buyer Property                                                         6.11
Buyer Scheduled Contract                                               6.16
Buyer Transaction Documents                                          4.3(h)
CAC I                                                              preamble
CAC II                                                             preamble
Cash and Investments                                                 1.1(1)
Cash Purchase Price                                                  1.4(a)
Castle A Common Stock                                                   6.4
Castle B Common Stock                                                2.2(a)
Closing                                                              4.1(a)
Closing Date                                                         4.1(a)
Code                                                               recitals
Communications Act                                                     5.12
Contracts                                                            1.1(d)
Crown Audited Statements                                                5.9
Crown Benefit Plan                                                  5.17(c)
Crown Communications Assets                                             1.1
</TABLE>



                                     -vi-
<PAGE>
 
<TABLE>
<CAPTION>
Term                                                                Section
- ----                                                                ------- 
<S>                                                                <C> 
Crown Communications Business                                      recitals
Crown Environmental Audits                                          5.22(a)
Crown Financial Statements                                           5.9(b)
Crown Interim Financial Statements                                   3.3(a)
Crown Leased Property                                                  5.15
Crown Material Adverse Effect                                           5.1
Crown Owned Property                                                   5.15
Crown Parties                                                      preamble
Crown Permitted Liens                                               5.14(a)
Crown Permitted Real Estate Liens                                      5.15
Crown Properties                                                       5.15
Crown Property                                                         5.15
Crown Stock                                                          2.2(a)
Crown Symbol                                                         1.1(e)
Crown Territory                                                      9.7(a)
Crown Transaction Documents                                          4.2(g)
Crown Unaudited Statements                                              5.9
Crowns                                                             preamble
CTSH                                                               recitals
CTSH Audited Statements                                              6.6(a)
CTSH Financial Statements                                            6.6(b)
CTSH Interim Financial Statements                                    3.3(b)
December 31 Crown Balance Sheets                                    5.14(a)
December 31 Buyer Balance Sheet                                     6.10(a)
Due Diligence Completion Date                                           3.1
EBITDA                                                                  3.4
Effective Time                                                       2.1(b)
Environmental Laws                                                  5.22(c)
Environmental Permits                                               5.22(b)
ERISA                                                               5.17(c)
Excluded Assets                                                         1.2
Excluded Liabilities                                                 1.3(b)
FAA                                                                    5.12
Final S Tax Period(s)                                                  13.1
GAAP                                                                    5.9
Governmental Entity                                                  1.1(a)
Hart-Scott-Rodino Act                                                   5.4
Hazardous Material                                                  5.22(c)
Indemnified Party                                                   12.2(e)
Intellectual Property                                                1.1(e)
IRS                                                                 5.17(i)
Licenses                                                             1.1(a)
Liens                                                                   1.1
</TABLE>



                                     -vii-
<PAGE>
 
<TABLE>
<CAPTION>
Term                                                                Section
- ----                                                                -------
<S>                                                                <C> 
Loss                                                                12.2(c)
Merger Consideration                                                 2.2(c)
Mergers                                                            recitals
Mobile                                                             preamble
Mobile Common Stock                                                  2.2(a)
Mobile Merger                                                      recitals
Mobile Merger Consideration                                          2.2(c)
Mobile Share                                                            5.6
Mobile Surviving Corporation                                         2.1(a)
Network                                                            preamble
Network Common Stock                                                 2.2(a)
Network Merger                                                     recitals
Network Merger Consideration                                         2.2(c)
Network Shares                                                          5.5
Network Surviving Corporation                                        2.1(a)
New Business                                                            9.7
Note                                                                 1.4(a)
PBCL                                                                 2.1(a)
PCBs                                                                5.22(b)
Person                                                             14.18(a)
Pre-Closing Tax Return                                              13.2(a)
Preferred Stock                                                         6.4
Property Taxes                                                      13.4(a)
Purchase Price                                                       1.4(a)
Real Property                                                        1.1(c)
Receivables                                                          1.1(g)
Related Person                                                      5.20(i)
Release                                                             5.22(c)
Representative                                                     14.18(a)
Restricted Activities                                                9.7(a)
Returns                                                             5.23(a)
Securities Act                                                         5.26
Sellers                                                            preamble
Sellers' Damages                                                    12.2(b)
Seller Scheduled Contract                                              5.20
Shareholder Agreement                                                4.2(f)
Straddle Period                                                     13.4(a)
Subsidiary                                                         14.18(a)
Tax Amount                                                           1.4(a)
Tax Controversy                                                        13.3
Tax Indemnification Period                                          13.4(a)
Taxes                                                               5.23(a)
Third Party Claim                                                   12.2(d)
</TABLE>


                                    -viii-
<PAGE>
 
<TABLE>
<CAPTION>
Term                                                                Section
- ----                                                                -------
<S>                                                                 <C> 
</TABLE> 






                                      -ix-
<PAGE>
 
                                    ASSET PURCHASE AND MERGER AGREEMENT dated as
                           of July 11, 1997, among Crown Network Systems, Inc.,
                           a Pennsylvania corporation ("Network"), Crown Mobile
                                                        -------
                           Systems, Inc., a Pennsylvania corporation ("Mobile"),
                                                                       ------
                           Robert A. Crown, individually and as a shareholder of
                           Network and Mobile, Barbara Crown, individually and
                           as a shareholder of Network and Mobile (Robert A.
                           Crown and Barbara Crown, referred to together as
                           "Sellers" or the "Crowns" and, the Crowns,
                            -------          ------
                           individually and d/b/a Crown Communications, together
                           with Network and Mobile, referred to as the "Crown
                                                                        -----
                           Parties"), Castle Acquisition Corp. I, a Pennsylvania
                           -------
                           corporation ("CAC I"), Castle Acquisition Corp. II, a
                                         -----
                           Pennsylvania corporation ("CAC II"), and Castle Tower
                                                      ------
                           Holding Corp., a Delaware corporation ("Buyer").
                                                                   -----

                                    RECITALS:

         1. Sellers own and operate a communications site acquisition,
ownership, design, development, construction, management and servicing business
that operates under the name of Crown Communications (the "Crown Communications
                                                           --------------------
Business"), including certain real estate, leases, licenses, management
- --------
agreements, towers, contracts and other assets described in more detail below.
Sellers also own and operate Network and Mobile.

         2. Sellers desire to sell, assign and transfer to Buyer, and Buyer
desires to purchase from Sellers, all the assets and properties used or held for
use in connection with the Crown Communications Business, all as described in
more detail below, all on the terms and subject to the conditions described
herein. In connection therewith, Buyer will assume certain liabilities and
obligations of the Crown Communications Business as further described herein.

         3. Simultaneously with the sale of assets described above, the parties
intend to effect a merger of CAC I with and into Network, with Network being the
surviving corporation (the "Network Merger"), and a merger of CAC II with and
                            --------------
into Mobile, with Mobile being the surviving corporation (the "Mobile Merger")
                                                               -------------
and, together with the Network Merger, the "Mergers").
                                            -------

         4. It is the intention of the parties that for United States Federal
income tax purposes each of the Mergers shall qualify as a "reorganization"
within the meaning of Section 368(a) of the Internal Revenue Code of 1986 (the
"Code") and that the purchase of the Crown Communications Business will be a
 ----
taxable transaction.

         5. It is the further intention of the parties, promptly following the
execution and delivery of this Agreement and the receipt by Sellers of an
advance payment by Buyer in the amount of $10,000,000 (the "Advance Payment"),
                                                            ---------------
by wire transfer of immediately available Pittsburgh funds to an account
specified by Sellers, that Sellers, on the one part, and Buyer, on the other
part, each shall commence a confirmatory due diligence investigation, including
a review of the businesses, assets, operations, properties, condition (financial
and otherwise), contingent liabilities, prospects (including projected EBITDA
(as defined herein)) and material agreements of the Buyer and its Subsidiaries
and Castle Transmission Services (Holdings) Ltd. ("CTSH") and its 
                                                   ----
<PAGE>
 
Subsidiaries by Sellers and of the Crown Communications Business, Network and
Mobile by Buyer. The closing of the transactions contemplated hereby shall be
subject to the satisfactory completion of such investigation as more fully set
forth in Article 3, and the disposition of the Advance Payment shall be as more
fully set forth in Sections 1.4 and 14.2.

         6.    Buyer has advised Sellers that it intends to complete a
reorganization of equity interests in CTSH such that, upon completion thereof,
Buyer or its successor will hold at least a majority of the outstanding equity
interests of CTSH; provided, however, that in no event shall the completion by
                   --------  -------
Buyer of such a reorganization be deemed to constitute a condition to Sellers'
obligation to close the transaction contemplated hereby.

         NOW, THEREFORE, in consideration of the foregoing and of other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, and intending to be legally bound, the parties agree as follows:


                                   ARTICLE 1.

             Purchase and Sale of Assets; Assumption of Liabilities
             ------------------------------------------------------


         1.1.  Crown Communications Assets. Subject to and in reliance upon the
               ---------------------------
representations, warranties and agreements herein set forth, and subject to the
terms and conditions herein contained, Sellers shall grant, convey, sell,
assign, transfer and deliver to Buyer on the Closing Date (as defined herein),
and Buyer shall purchase on the Closing Date, free and clear of all liabilities
and obligations, as well as all covenants, restrictions, mortgages, liens,
security interests, claims, pledges, easements, assignments, subleases,
covenants, rights-of-way, options, rights of refusal, charges, leases, licenses,
defects in title, encumbrances and any other restriction of any kind or nature
(collectively, "Liens") except only those liabilities, obligations and Liens
                -----
which are to be assumed by Buyer pursuant to Section 1.3 hereof and except Crown
Permitted Liens (as defined herein) and Crown Permitted Real Estate Liens (as
defined herein), all properties, assets, privileges, rights, interests and
claims, real and personal, tangible and intangible, of every type and
description, wherever located, including the Crown Communications Business as a
going concern and goodwill, that are owned by Sellers and used or held for use
in connection with the Crown Communications Business, except for those assets
which are expressly excluded pursuant to Section 1.2 hereof (the "Crown
                                                                  -----
Communications Assets"). Without limiting the foregoing, the Crown
- ---------------------
Communications Assets shall include the following:

               (a) Licenses and Authorizations. All licenses, permits, 
                   ---------------------------
franchises, certificates of compliance, consents, approvals and authorizations
by any Federal, state or local government or any subdivision thereof or any
court, administrative agency or commission or other governmental agency or
authority (a "Governmental Entity") (all the foregoing, including any renewals,
              -------------------
extensions or modifications thereof and additions thereto and any pending
applications therefor, being referred to herein as "Licenses") that are held by
                                                    --------
Sellers and used or held for use in connection with the Crown Communications
Business, including those Licenses listed on Schedule 5.12, together with any
Licenses acquired as permitted by the terms of this Agreement between the date
of this Agreement and the Closing Date.

                                      -2-
<PAGE>
 
               (b) Tangible Personal Property. All physical assets, equipment, 
                   --------------------------
vehicles, furniture, fixtures, office materials and supplies, spare parts, and
other tangible personal property of every kind and description owned, leased or
licensed by Sellers as of the date of this Agreement and used or held for use in
connection with the Crown Communications Business, including those items
described generally on Schedule 5.14, and any additions, improvements,
replacements and alterations thereto made as permitted by the terms of this
Agreement between the date of this Agreement and the Closing Date, in each case
other than any tangible personal property consumed in the ordinary course of
business and operations of the Crown Communications Business from the date
hereof to the Closing Date.

               (c) Real Property. All land and leaseholds, and other estates in 
                   -------------
real property and appurtenances thereto, and all easements, privileges,
rights-of-way, riparian and other water rights, lands underlying any adjacent
streets or roads, appurtenances, licenses, permits and other rights pertaining
to or accruing to the benefit of such real property and leasehold interests and
estates in real property, buildings, towers, transmitters, antennae and
warehouses, and fixtures and improvements thereon ("Real Property") owned,
                                                    -------------
leased or licensed by Sellers as of the date hereof and used or held for use in
connection with the Crown Communications Business, including those described
generally on Schedule 5.15, and any additions, improvements, replacements and
alterations thereto made as permitted by the terms of this Agreement between the
date of this Agreement and the Closing Date.

               (d) Contracts. All contracts, leases, licenses (other than 
                   ---------
Licenses), indentures, agreements, commitments and all other legally binding
arrangements, whether oral or written, express or implied ("Contracts") entered
                                                            ---------
into in connection with the Crown Communications Business, including those
listed on Schedule 5.20, together with all Contracts entered into as permitted
by the terms of this Agreement between the date of this Agreement and the
Closing Date (collectively, the "Assumed Contracts").
                                 -----------------

               (e) Trademarks, etc. All trademarks (registered or unregistered),
                   ---------------
service marks, franchises, patents, trade names, jingles, slogans, and
logotypes, copyrights and other intangible rights, including any applications
therefor and other material intellectual property and proprietary rights,
whether or not subject to statutory registration or protection (the
"Intellectual Property"), in each case owned, leased or licensed by Sellers and
 ---------------------
used or held for use as of the date of this Agreement in connection with the
Crown Communications Business, including the current Crown corporate symbol (the
"Crown Symbol") and other Intellectual Property described generally on Schedule
 ------------
5.16, and any Intellectual Property acquired by Sellers in connection with the
Crown Communications Business as permitted by the terms of this Agreement
between the date hereof and the Closing Date.

               (f) Files and Records. All files, records, books of account,
                   -----------------
general, financial, accounting and personnel records, invoices, computer
programs, tapes, electronic data processing software, customer and supplier
lists, correspondence and other records of Sellers used or held for use by or
otherwise relating to the Crown Communications Business.

               (g) Prepaid Expenses and Receivables; Other Current Assets. All 
                   ------------------------------------------------------
prepaid expenses (other than prepaid Taxes (as defined in Section 5.23)) and
notes and accounts 

                                      -3-
<PAGE>
 
receivable ("Receivables") and any other current assets arising in connection
             -----------
with the Crown Communications Business and existing on the Closing Date.

               (h) Security Deposits. All security deposits held by third 
                   -----------------
parties for the benefit of the Crown Communications Business on the Closing
Date.

               (i) Claims. All rights, claims, credits or causes of action 
                   ------
against third parties relating to or arising out of the Crown Communications
Business, except any and all claims of Sellers for refunds of Taxes paid or
attributable to a taxable period (or portion thereof) ending on or prior to the
Closing.

               (j) Goodwill. All Sellers' goodwill in, and the going concern 
                   --------
value of, the Crown Communications Business.

               (k) Cash and Investments. All cash on hand or in bank accounts 
                   --------------------
and other cash items, cash equivalents and short-term investments (collectively,
"Cash and Investments") held in connection with the Crown Communications
Business on the Closing Date.

               (l) Insurance. All policies and contracts of insurance, other 
                   ---------
than directors' and officers' liability insurance, relating to the Crown
Communications Business, together with all proceeds received by Sellers from any
such policy or contract after the Closing.

         1.2.  Excluded Assets. The following shall be excluded from the Crown
               ---------------
Communications Assets and retained by Sellers (the "Excluded Assets"):

               (a) Claims for Taxes. Any and all claims of Sellers for refunds
                   ----------------
of Taxes paid or attributable to a taxable period (or portion thereof) ending on
or prior to the Closing;

               (b) Certain Personal Property. All items of personal property
                   -------------------------
listed on Exhibit A.

         1.3.  Assumption of Certain Liabilities; Excluded Liabilities.
               -------------------------------------------------------

               (a) Upon the terms and subject to the conditions of this
Agreement, effective as of the Closing Date, Buyer shall assume and agree to
pay, perform and discharge when due, and indemnify Sellers and hold each of them
harmless from the following liabilities and obligations of the Crown
Communications Business (the "Assumed Liabilities"):
                              -------------------

                   (i)   outstanding indebtedness of the Crown Communications
         Business, including approximately $20.5 million in the aggregate
         outstanding as of May 31, 1997 and additional indebtedness incurred
         thereafter in the ordinary course of business; provided, however, that
                                                        --------  -------
         the aggregate amount of outstanding indebtedness assumed will not
         exceed (A) $25 million, plus (B) the aggregate amount of any additional
         indebtedness incurred with the written consent of Buyer pursuant to
         Section 7.1.

                   (ii)  trade payables and other accounts payable reflected on
         the balance sheet as of June 30, 1997 of Crown Communications included
         as part of the Crown 

                                      -4-
<PAGE>
 
         Interim Financial Statements (as defined herein) and those arising
         thereafter in the ordinary course of business consistent with past
         practice;

                    (iii) all liabilities and obligations of Sellers arising
          under or relating to the Assumed Contracts; and

                    (iv)  all other liabilities and obligations of Sellers
          arising in the ordinary course of business consistent with past
          practice, up to $2 million in the aggregate.

               (b)  Buyer shall in no event assume, nor shall it be liable for,
any obligations or liabilities of Sellers of any nature whatsoever (whether
express or implied, fixed or contingent, known or unknown) other than the
Assumed Liabilities (all obligations and liabilities of Sellers other than the
Assumed Liabilities are referred to herein collectively as the "Excluded
Liabilities"). Without limiting the foregoing, Buyer shall not be deemed to
assume any liabilities relating to or arising out of any Excluded Assets or any
liabilities for any Taxes, other than liability for transfer taxes to the extent
assumed by Buyer pursuant to Section 14.3.

          1.4. Advance Payment; Payment of Purchase Price.
               ------------------------------------------

               (a) The total consideration for the Crown Communications Assets
shall consist of (i) the sum of (A) $100,000,000 plus (B) an amount equal to the
amount necessary to permit Sellers to pay all income taxes relating to the
business and operations of Crown Communications, Network and Mobile through the
Closing Date (the "Tax Amount") in cash (the "Purchase Price") and (ii) the
                                              --------------
assumption by Buyer of the Assumed Liabilities. The Advance Payment shall be
applied at Closing against the Purchase Price, subject to the provisions of
Article 3 and Sections 14.1 and 14.2.

               (b) On the Closing Date, Buyer shall pay, or cause to be paid, to
Sellers for the Crown Communications Assets (i) by wire transfer of $15,000,000
($25,000,000 less the Advance Payment) in immediately available Pittsburgh funds
to an account specified by Sellers in writing at least two business days prior
to the Closing and (ii) by delivery to Sellers of a negotiable promissory note
of Buyer in substantially the form of Exhibit B in the principal amount equal to
the sum of (A) $75,000,000 plus (B) the Tax Amount (the "Note"), which Note
                                                         ----
shall be due on October 31, 1997 (subject to earlier maturity 30 days following
demand, which demand may be made any time after September 15, 1997, as specified
in the Note) and shall bear interest at the rate of 11 percent per annum,
payable monthly commencing on the date that is one month following the Closing
Date. Buyer's obligations under the Note will be secured by a first priority
pledge of all of the outstanding capital stock of the Network Surviving
Corporation and the Mobile Surviving Corporation (each as defined herein) and of
Castle Acquisition Corp. III, a Delaware corporation ("CAC III") and a wholly
                                                       -------
owned subsidiary of Buyer, which will, as of the Closing Date, hold all of the
Crown Communications Assets. Buyer and Sellers agree to allocate the Purchase
Price, together with the value of the Assumed Liabilities, as provided in
Section 13.9. Sellers shall deliver to Buyer as soon as practicable after the
execution of this Agreement, an estimate of the Tax Amount, and shall certify
the Tax Amount to Buyer at least one business day prior to the Closing Date,
which certificate shall include a reasonably detailed calculation of the Tax
Amount.

                                      -5-
<PAGE>
 
         1.5.     Certain Definitions. For the avoidance of doubt, the Crown
                  -------------------
Communications Business shall not include the capital stock, business, assets or
liabilities of Network or Mobile. For all purposes of this Agreement, the Crown
Communications Assets, the Assumed Liabilities and the capital stock, business,
assets and liabilities of Network and Mobile are referred to herein as the
"Acquired Business."
 -----------------


                                   ARTICLE 2.

                             The Merger Transactions
                             -----------------------


         2.1.     The Mergers Generally.
                  ---------------------

                  (a) Upon the terms and subject to the conditions set forth
herein, at the Effective Time (as defined below) (i) CAC I shall be merged with
and into Network in accordance with the Pennsylvania Business Corporation Law
(the "PBCL") and the separate corporate existence of CAC I shall thereupon cease
      ----
and (ii) CAC II shall be merged with and into Mobile in accordance with the PBCL
and the separate corporate existence of CAC II shall thereupon cease. Network
and Mobile shall be the surviving corporations in the Mergers (the "Network
                                                                    -------
Surviving Corporation" and the "Mobile Surviving Corporation," respectively) and
- ---------------------           ----------------------------
shall continue to be governed by the laws of the Commonwealth of Pennsylvania.
The Mergers shall have the effects set forth in Section 1929 of the PBCL.

                  (b) Simultaneously with the Closing, Network and Mobile will
file articles of merger with the Department of State of the Commonwealth of
Pennsylvania and make all other filings or recordings required by the PBCL in
connection with the Mergers. Each of the Mergers shall become effective at such
time as the relevant articles of merger are duly filed with the Department of
State of the Commonwealth of Pennsylvania or at such later time as is agreed by
the parties and specified in the articles of merger (the "Effective Time").
                                                          --------------

                  (c) The articles of incorporation and by-laws of the Network
Surviving Corporation and the Mobile Surviving Corporation shall contain
provisions substantially identical to those of the articles of incorporation and
by-laws of CAC I and CAC II, respectively.

         2.2.     Conversion of Shares.
                  --------------------

                  (a) At the Effective Time:

                      (i)   each share of common stock, no par value, of Network
         (the "Network Common Stock") held by Network as treasury stock
               --------------------
         immediately prior to the Effective Time shall, by virtue of the Network
         Merger and without any action on the part of the holder thereof, be
         canceled, and no Castle Common Stock (as defined herein) or other
         consideration shall be delivered in exchange therefor;

                      (ii)  each share of common stock, par value $1.00 per
         share, of Mobile (the "Mobile Common Stock" and, together with the
                                -------------------
         Network Common Stock, the "Crown Stock") held by Mobile as treasury
                                    -----------
         stock immediately prior to the Effective Time 

                                      -6-
<PAGE>
 
         shall, by virtue of the Mobile Merger and without any action on the
         part of the holder thereof, be canceled, and no Castle Common Stock or
         other consideration shall be delivered in exchange therefor;

                      (iii)  each share of common stock, par value $0.01 per
         share, of CAC I outstanding immediately prior to the Effective Time
         shall, by virtue of the Network Merger and without any action on the
         part of CAC I or the holder thereof, be converted into and become one
         share of common stock of the Network Surviving Corporation and shall
         constitute the only outstanding shares of capital stock of the Network
         Surviving Corporation;

                      (iv)   each share of common stock, par value $0.01 per
         share, of CAC II outstanding immediately prior to the Effective Time
         shall, by virtue of the Mobile Merger and without any action on the
         part of CAC II or the holder thereof, be converted into and become one
         share of common stock of the Mobile Surviving Corporation and shall
         constitute the only outstanding shares of capital stock of the Mobile
         Surviving Corporation;

                      (v)    each share of Network Common Stock outstanding
         immediately prior to the Effective Time shall, by virtue of the Network
         Merger and without any action on the part of the holder thereof, except
         as otherwise provided in Section 2.2(a)(i), be converted into the right
         to receive the number of fully paid and nonassessable shares of Class B
         Common Stock, par value $0.01 per share, of Buyer (the "Castle B Common
                                                                 ---------------
         Stock") equal to the Network Merger Consideration (as defined herein);
         ----- 
         and

                      (vi)   each share of Mobile Common Stock outstanding
         immediately prior to the Effective Time shall, by virtue of the Mobile
         Merger and without any action on the part of the holder thereof, except
         as otherwise provided in Section 2.2(a)(ii), be converted into the
         right to receive the number of fully paid and nonassessable shares of
         Castle B Common Stock equal to the Mobile Merger Consideration (as
         defined herein).

                  (b) From and after the Effective Time, all shares of Crown
Stock converted in accordance with Section 2.2(a)(v) or (vi) shall no longer be
outstanding and shall, by virtue of the Mergers and without any action on the
part of the holder thereof, automatically be canceled and retired and shall
cease to exist, and each holder of a certificate representing any such shares
shall cease to have any rights with respect thereto, except the right to receive
the applicable Merger Consideration (as defined herein) and any dividends
payable pursuant to Section 2.3(d). From and after the Effective Time, all
certificates representing the common stock of CAC I or CAC II shall be deemed
for all purposes to represent the number of shares of common stock of the
Network Surviving Corporation or the Mobile Surviving Corporation, as the case
may be, into which they were converted in accordance with Section 2.1(a)(iii) or
(iv).

                  (c) The "Network Merger Consideration" shall be [ ] shares of
                           ----------------------------
Castle B Common Stock per share of Network Common Stock, and the "Mobile Merger
                                                                  -------------
Consideration" shall be [ ] shares of Castle B Common Stock per share of Mobile
- -------------
Common Stock (the Mobile Merger Consideration, together with the Network Merger
Consideration, the "Merger 
                    ------

                                      -7-
<PAGE>
 
Consideration") [the combined number of shares comprising the Merger
- -------------
Consideration to be not less than 1,322,000 shares of Castle B Common Stock
(based on an assumed number of fully diluted shares equal to 7,084,000) and to
be determined and apportioned by Buyer and Sellers on or prior to the Due
Diligence Completion Date based on the actual number of fully diluted shares and
the relative values of Network and Mobile] which the parties agree represents an
aggregate value of $55,000,000.

         2.3.     Surrender and Payment.
                  ---------------------

                  (a) At the Closing, Buyer shall cause the issuance of the
Merger Consideration to the Sellers upon proper delivery of the outstanding
Crown Stock. Buyer and Sellers contemplate that the exchange of Merger
Consideration for certificates of Crown Stock will occur at the Closing.

                  (b) Upon surrender to the Buyer of a certificate or
certificates representing shares of the Network Common Stock or the Mobile
Common Stock, the Crowns will be entitled to receive the Merger Consideration
payable in respect of such shares and any dividends payable pursuant to Section
2.3(d). Until so surrendered, each such certificate shall, after the Effective
Time, represent for all purposes only the right to receive the Network Merger
Consideration or the Mobile Merger Consideration, as applicable, and any
dividends payable pursuant to Section 2.3(d).

                  (c) After the Effective Time, there shall be no further
registration of transfers of shares of Crown Stock. If, after the Effective
Time, certificates representing such shares are presented to Network Surviving
Corporation or Mobile Surviving Corporation, they shall be canceled and
exchanged for the consideration provided for, and in accordance with the
procedures set forth, in this Article 2.

                  (d) No dividends or other distributions with respect to Castle
B Common Stock issued in the Mergers shall be paid to the holders of any
unsurrendered certificates representing shares of Crown Stock until such
certificates are surrendered as provided in this Section 2.3. Subject to the
effect of applicable laws, following the surrender of such certificates, there
shall be paid, without interest, to the record holder of the Castle B Common
Stock issued in exchange therefor at the time of such surrender, the amount of
dividends or distributions with a record date after the Effective Date payable
with respect to such whole shares of Castle B Common Stock prior to or on the
date of such surrender and not previously paid, less the amount of any
withholding taxes which may be required thereon.


                                   ARTICLE 3.

                           Due Diligence Investigation
                           ---------------------------


         3.1.     Due Diligence Investigation Generally. From the date of this
                  -------------------------------------
Agreement through and including August 1, 1997 (the "Due Diligence Completion
                                                     ------------------------
Date"), Sellers, on the one part, and the Buyer, on the other part, each shall
- ----
have the opportunity to conduct a due diligence investigation of the business,
assets, operations, properties, condition (financial and otherwise), contingent
liabilities, prospects and material agreements of Buyer and its Subsidiaries and
CTSH 

                                      -8-
<PAGE>
 
and its Subsidiaries (in the case of Sellers) and of the Crown Communications
Business, Network and Mobile (in the case of Buyer) for the limited purposes of:
(a) in the case of Sellers, (i) confirming the accuracy, in all material
respects, of the Buyer's representations and warranties provided in Article 6,
and (ii) confirming the 1998 projections of earnings before interest, taxes,
depreciation and amortization ("EBITDA") of Buyer and its Subsidiaries and CTSH
                                ------
and its Subsidiaries set forth in Exhibit C, within the parameters described
below; and (b) in the case of Buyer, (i) confirming the accuracy, in all
material respects, of the Crown Parties' representations and warranties provided
in Article 5, (ii) confirming the 1998 projections of EBITDA for the Acquired
Business set forth on Exhibit D, within the parameters described below, and
confirming that the amount of indebtedness for borrowed money that is needed to
generate such projected EBITDA does not exceed $25 million, (iii) determining,
in good faith, that Buyer is reasonably satisfied in all material respects with
the terms of all Contracts, Licenses and title to assets and properties of the
Acquired Business, taken as a whole, including without limitation the
assignability or risks associated with being unable to obtain consents to
assignment of any of the Contracts, Licenses or other properties or assets of
the Crown Communications Business, Mobile or Network (including any of the
Contracts, Licenses or other properties or assets identified in the Sellers'
disclosure schedules as containing restrictions on, or resulting in other
adverse consequences upon, the transfer or assignment of such Contracts,
Licenses or other properties or assets), and (iv) determining, in good faith,
that Buyer is reasonably satisfied in all material respects with all
environmental conditions affecting or relating to the Acquired Business and the
business and operations thereof and the status of compliance by the Acquired
Business with all Environmental Laws (as defined herein). For purposes of
clauses (a)(ii) and (b)(ii) of this Section 3.1, such projected 1998 EBITDA will
be deemed to have been confirmed if the Sellers or Buyer, as the case may be,
determine(s), based upon such due diligence, that the projected 1998 EBITDA
numbers of the other party are at least equal to ninety percent (90%) of the
amount of EBITDA projected for such other party set forth on Exhibit C or D,
respectively. In furtherance of the foregoing, each party shall comply at all
times during the period from the date of this Agreement through and including
the Closing Date with its respective obligations under Section 9.3.

         3.2.     Interim Financial Statements.
                  ----------------------------

                  (a) Sellers shall deliver to Buyer on or prior to July 18,
1997 the unaudited balance sheets of each of Crown Communications, Network and
Mobile as of June 30, 1997, and the unaudited statements of income and cash flow
of each of Crown Communications, Network and Mobile for the six months then
ended, together with the notes to such interim financial statements
(collectively, the "Crown Interim Financial Statements").
                    ----------------------------------

                  (b) Buyer shall deliver to Sellers on or prior to July 18,
1997 (i) the unaudited balance sheet of Buyer and its consolidated Subsidiaries
as of June 30, 1997, and the statements of income and cash flow of Buyer and its
subsidiaries for the six months then ended together with the notes to such
interim financial statements (collectively, the "Buyer Interim Financial
                                                 -----------------------
Statements"), and (ii) the unaudited balance sheet of CTSH and its consolidated
- ----------
Subsidiaries as of June 30, 1997, and the unaudited profit and loss account and
cash flow statement of CTSH and its Subsidiaries for the three months then ended
together with the notes to such interim financial statements (collectively, the
"CTSH Interim Financial Statements").
 ---------------------------------

                                      -9-
<PAGE>
 
                                   ARTICLE 4.

                  Closing; Deliveries of the Parties at Closing
                  ---------------------------------------------


         4.1.     The Closing.
                  -----------

                  (a) The consummation of the transactions provided for in this
Agreement, which shall be deemed to occur at the Effective Time (the "Closing"),
                                                                      -------
and shall take place at the offices of Kirkpatrick & Lockhart LLP, 1500 Oliver
Building, Pittsburgh, PA 15222 at 10:00 A.M. on August 7, 1997 or, if the
conditions to Closing set forth in Articles 10 and 11 shall not have been
satisfied by such date, as soon as practicable after such conditions have been
satisfied. The date on which the Closing shall occur is referred to herein as
the "Closing Date."
     ------------

         4.2.     Deliveries at the Closing by the Crown Parties. At the
                  ----------------------------------------------
Closing, Sellers shall deliver to Buyer, CAC I and CAC II:

                  (a) bills of sale, endorsements, assignments, certificates of
title and other good and sufficient instruments of sale, transfer and assignment
in form and substance reasonably satisfactory to Buyer and its counsel
sufficient to sell, transfer and assign to Buyer all right, title and interest
of Seller in and good and valid title to the Crown Communications Assets (other
than Real Property owned by Sellers covered by (b) below), subject to Crown
Permitted Liens;

                  (b) one or more special warranty deeds with covenant against
grantor's acts (or an equivalent form of deed suitable for recordation in the
relevant jurisdictions), in form and substance reasonably satisfactory to Buyer
and its counsel, but subject to all Crown Permitted Real Estate Liens, with
respect to all Real Property owned by Sellers and included within the Crown
Communications Assets; (c) certified copies of resolutions, duly adopted by the
Boards of Directors and shareholders of Network and Mobile, which shall be in
full force and effect at the time of the Closing, authorizing the execution,
delivery and performance by Sellers of this Agreement and the consummation of
the transactions contemplated hereby and any other authorization required for
the sole proprietorship to transfer the Crown Communications Assets;

                  (d) a certificate from each of the Crown Parties signed by
such party or an executive officer of such party, as applicable, to the effect
set forth in clauses (a) and (b) of Section 11.1;

                  (e) an opinion dated as of the Closing Date of Kirkpatrick &
Lockhart LLP, counsel to Seller, with respect to such matters as Buyer may
reasonably request in form and substance reasonably satisfactory to Buyer;

                  (f) executed counterparts to the Shareholder Agreement
executed by each of the Sellers, substantially in the form set forth as Exhibit
E (the "Shareholder Agreement"); and
        ---------------------

                                      -10-
<PAGE>
 
           (g) such other documents or instruments as Buyer or its counsel may
reasonably request (i) to demonstrate satisfaction of the conditions to Closing
set forth in Article 11 and compliance by the Crown Parties with the agreements
set forth in this Agreement and (ii) for purposes of the issuance of Buyer's
owner's title insurance policy with respect to all Real Property to be acquired
without deletion of the standard exceptions to title (such instruments referred
to in clause (a) above, deeds referred to in clause (b) above, the Shareholder
Agreement referred to in clause (f) above and this Agreement, collectively, the
"Crown Transaction Documents").
- -----------------------------

     4.3.  Deliveries at the Closing by Buyer. At the Closing, Buyer shall
           ----------------------------------
deliver to the Crown Parties:

           (a) the Purchase Price for the Crown Communications Assets,
consisting of the Cash Consideration (less the amount of the Advance Payment)
and the Note, in accordance with Section 1.4 hereof;

           (b) executed counterparts of a pledge agreement securing Buyer's
obligations under the Note, together with the certificates representing all the
capital stock in CAC III, the Network Surviving Corporation and the Mobile
Surviving Corporation and stock powers for each executed in blank necessary to
perfect Sellers' security interests referred to in Section 1.4(b), in each case
in form and substance reasonably satisfactory to Sellers and their counsel;

           (c) an instrument or instruments of assumption of the Assumed
Liabilities of the Sellers' responsibilities therefor, in each case in form and
substance reasonably satisfactory to Sellers and their counsel;

           (d) certified copies of resolutions, duly adopted by the Boards of
Directors of Buyer, CAC I and CAC II which shall be in full force and effect at
the time of the Closing, authorizing the execution, delivery and performance by
Buyer, CAC I and CAC II of this Agreement and the consummation of the
transactions contemplated hereby;

           (e) upon proper delivery of the Crown Stock, the Merger Consideration
in connection with the Mergers;

           (f) a certificate from each of Buyer, CAC I and CAC II signed by an
executive officer of such party to the effect set forth in clauses (a) and (b)
of Section 10.1;

           (g) (i) an opinion of Cravath, Swaine & Moore, counsel to Buyer, (ii)
an opinion of Brown, Parker & Leahy, counsel to Buyer, and (iii) an opinion of
Buchanan Ingersoll Professional Corporation, counsel to Buyer, in each case
dated as of the Closing Date with respect to such matters as Sellers may
reasonably request in form and substance reasonably satisfactory to Sellers;

           (h) executed counterparts to the Shareholder Agreement, executed by
all parties thereto other than the Sellers;

           (i) articles of merger to effect the Mergers as contemplated by
Section 2.1;

                                      -11-
<PAGE>
 
           (j) a letter agreement from Lehman Brothers and Buyer in favor of
Sellers confirming the continuing status of Buyer's committed financing and
stating that Buyer and Lehman Brothers each will provide written notice to
Sellers not less than ten (10) days prior to the scheduled termination of such
financing commitment, or prior to any termination effected by such party, such
letter to be in form and substance reasonably satisfactory to Sellers and their
counsel; and

           (k) such other documents or instruments as the Crown Parties or their
counsel may reasonably request to demonstrate satisfaction of the conditions to
Closing as set forth in Article 10 and compliance by Buyer with the agreements
set forth in this Agreement (the Note referred to in clause (a) above, the
instruments referred to in clauses (b) and (c) above, the Shareholder Agreement
referred to in clause (h) above, and this Agreement, collectively, the "Buyer
                                                                       ------
Transaction Documents").
- ----------------------

     4.4.  Pre-Closing Deliveries. Not later than three business days following
           ----------------------
the Due Diligence Completion Date, Sellers shall have furnished to Buyer draft
forms of all of the Crown Transaction Documents and all other documents to be
delivered by Sellers in accordance with Section 4.2, and Buyer shall have
furnished to Sellers draft forms of all of the Buyer Transaction Documents and
all other documents to be delivered by Buyer in accordance with Section 4.3, in
each case with a view to approving and completing all such documents and
instruments not later than three business days prior to the scheduled Closing
Date.

     4.5.  Time is of the Essence. With regard to all dates and time periods set
           ----------------------
forth or referred to in this Agreement, time is of the essence.


                                   ARTICLE 5.

               Representations and Warranties of the Crown Parties
               ---------------------------------------------------
 
     Each of the Crown Parties represents and warrants to Buyer, jointly and
severally, as follows:

     5.1.  Corporate Status; Authority. Each of Network and Mobile is a
           ---------------------------
corporation duly organized, validly existing and in good standing under the laws
of the Commonwealth of Pennsylvania. Each of Network and Mobile is duly
qualified and in good standing to do business as a foreign corporation and the
Crown Communications Business is duly qualified and in good standing to do
business in each jurisdiction in which the conduct or nature of its business or
the ownership, leasing or holding of its properties makes such qualification
necessary, except such jurisdictions where the failure to be so qualified or in
good standing, individually or in the aggregate, would not reasonably be
expected to have a material adverse effect (i) on the condition (financial or
otherwise), business, liabilities, properties, assets, prospects or results of
operations of the Acquired Business, taken as a whole, or (ii) on the ability of
the Crown Parties to perform their obligations under or to consummate the
transactions contemplated by this Agreement (a "Crown Material Adverse Effect").
                                                -----------------------------
Each of Network and Mobile has all requisite corporate 

                                      -12-
<PAGE>
 
power, and the Crown Communications Business has all requisite power, to carry
on its business and operations as it is now being conducted and to own and
operate such business, to enter into this Agreement, to perform its obligations
hereunder and to complete the transactions contemplated hereby.

     5.2.  Corporate Action. All corporate and shareholder actions and
           ----------------
proceedings necessary to be taken by or on the part of each of Network and
Mobile in connection with the transactions contemplated by the Crown Transaction
Documents have been duly and validly taken, and this Agreement has been duly and
validly authorized, executed and delivered by each of Network and Mobile and
constitutes, and each of the other Crown Transaction Documents, as applicable,
will be duly and validly authorized, executed and delivered by each of Network
and Mobile and will constitute, the legal, valid and binding obligation of each
of Network and Mobile, enforceable against each of Network and Mobile in
accordance with and subject to its terms, except as may be limited by bankruptcy
or other laws affecting creditors' rights and by equitable principles.

     5.3.  Authority; Execution. Each of the Sellers has all requisite power and
           --------------------
authority to execute and deliver the Crown Transaction Documents and to
consummate the transactions contemplated thereby. All acts and other proceedings
required to be taken by the Sellers to authorize the execution, delivery and
performance of the Crown Transaction Documents and the consummation of the
transactions contemplated thereby have been duly and properly taken. This
Agreement has been duly executed and delivered by each Seller and constitutes,
and each of the other Crown Transaction Documents, as applicable, will be duly
executed and delivered by each Seller and will constitute, a legal, valid and
binding obligation of such Seller, enforceable against such Seller in accordance
with and subject to its terms, except as may be limited by bankruptcy or other
laws affecting creditors' rights and by equitable principles.

     5.4.  No Conflicts. Except as set forth on Schedule 5.4, neither the
           ------------
execution, delivery and performance by the Crown Parties, as applicable, of the
Crown Transaction Documents nor the consummation by the Crown Parties of the
transactions contemplated thereby is an event that, by itself or with the giving
of notice or the passage of time or both, will (i) conflict with the articles of
incorporation or by-laws, as amended, of either Network or Mobile, (ii)
constitute a violation of, or conflict with or result in any breach of or any
default under, or constitute grounds for termination or acceleration of, any
License, mortgage, indenture, lease, contract, agreement or instrument to which
any of the Crown parties or the Acquired Business is a party or by which any of
them is bound, except for such violations, conflicts, breaches, terminations and
accelerations as individually or in the aggregate would not have or be
reasonably expected to have a Crown Material Adverse Effect or result in the
creation of any Lien (other than a Permitted Lien (as defined herein)) upon any
of the assets of the Acquired Business or (iii) violate (A) any judgment, decree
or order or (B) any statute, rule or regulation, in each such case, applicable
to any of the Crown Parties or the Acquired Business. The execution, delivery
and performance by the Crown Parties of this Agreement, and the consummation by
the Crown Parties of the transactions contemplated hereby, require no action by
or in respect of, or filing with, any Governmental Entity other than (a) the
filing of articles of merger with the Department of State of the Commonwealth of
Pennsylvania and of appropriate documentation with the relevant authorities of
other states in which Network or Mobile or the Crown Communications Business is
qualified to 

                                      -13-
<PAGE>
 
do business; (b) compliance with any applicable requirements of the Hart-Scott-
Rodino Antitrust Improvements Act of 1976, as amended (the "Hart-Scott-Rodino
                                                            -----------------
Act"); (c) the approvals of the FCC contemplated by this Agreement; (d) actions
- ---
or filings which, if not taken or made, would not, individually or in the
aggregate, reasonably be expected to have a Crown Material Adverse Effect; and
(e) filings and notices not required to be made or given until after the
Effective Time.

     5.5.  Capitalization of Network. The authorized capital stock of Network
           -------------------------
consists of 100,000 shares of Common Stock, no par, of which two shares are duly
authorized and validly issued and outstanding, fully paid and nonassessable (the
"Network Shares"). Robert A. Crown is the record and beneficial owner of one
 --------------
Network Share and Barbara Crown is the record and beneficial owner of one
Network Share.. Except for the Network Shares, there are no shares of capital
stock or other equity securities of Network outstanding. The Network Shares have
not been issued in violation of, and the Network Shares are not subject to, any
purchase option, call, right of first refusal, preemptive, subscription or
similar rights under any provision of applicable law, the Network articles of
incorporation or by-laws, as amended, any Contract to which Network or Sellers
are subject, bound or a party or otherwise. There are no outstanding warrants,
options, rights, "phantom" stock rights, agreements, convertible or exchangeable
securities or other commitments (other than this Agreement) (a) pursuant to
which any of the Sellers or Network is or may become obligated to issue, sell,
purchase, return or redeem any shares of capital stock or other securities of
Network or (b) that give any Person the right to receive any benefits or rights
similar to any rights enjoyed by or accruing to the Crowns as holders of the
Network Shares. There are no equity securities of Network reserved for issuance
for any purpose. There are no outstanding bonds, debentures, notes or other
securities having the right to vote on any matters on which stockholders of
Network may vote.

     5.6.  Capitalization of Mobile. The authorized capital stock of Mobile
           ------------------------
consists of 1,000 shares of Common Stock, par value $1.00 per share, of which
one share is duly authorized and validly issued and outstanding, fully paid and
nonassessable (the "Mobile Share"). Robert A. Crown is the record and beneficial
                    ------------
owner of 1 Mobile Share. Except for the Mobile Share, there are no shares of
capital stock or other equity securities of Mobile outstanding. The Mobile Share
has not been issued in violation of, and the Mobile Share is not subject to, any
purchase option, call, right of first refusal, preemptive, subscription or
similar rights under any provision of applicable law, the Mobile articles of
incorporation or by-laws, as amended, any Contract to which Mobile or Sellers
are subject, bound or a party or otherwise. There are no outstanding warrants,
options, rights, "phantom" stock rights, agreements, convertible or exchangeable
securities or other commitments (other than this Agreement) (a) pursuant to
which any of the Sellers or Mobile is or may become obligated to issue, sell,
purchase, return or redeem any shares of capital stock or other securities of
Mobile or (b) that give any Person the right to receive any benefits or rights
similar to any rights enjoyed by or accruing to Robert A. Crown as holder of the
Mobile Share. There are no equity securities of Mobile reserved for issuance for
any purpose. There are no outstanding bonds, debentures, notes or other
securities having the right to vote on any matters on which stockholders of
Mobile may vote.

     5.7.  Equity Interests. Except as set forth on Schedule 5.7, neither
           ----------------
Network nor Mobile owns, nor do the Crown Communications Assets include,
directly or indirectly, any capital stock of or other equity interests in any
corporation, partnership, limited liability company, limited 

                                      -14-
<PAGE>
 
liability partnership or other Person and neither Network, Mobile nor Crown
Communications is a member of or participant in any partnership, joint venture,
limited liability company, limited liability partnership or similar Person.
Other than the Crown Stock, Sellers do not own capital stock of or other equity
interests in any corporation, partnership, limited liability company, limited
liability partnership or other Person that is related to or involved in the
conduct or operation of the Crown Communications Business or the business of
Network or Mobile or any similar or related business or operations.

     5.8.  Title to the Crown Stock. The Crowns have good and valid title to the
           ------------------------
Network Shares and the Mobile Share, free and clear of any Liens. Assuming Buyer
has the requisite power and authority to be the lawful owner of the Crown Stock,
upon delivery to Buyer at the Closing of certificates representing the Crown
Stock, duly endorsed by Sellers for transfer to Buyer, and upon Sellers' receipt
of the Merger Consideration with respect to such shares, good and valid title to
the Crown Stock will pass to Buyer, free and clear of any Liens, other than
those arising from acts of Buyer or its Affiliates (including, without
limitation, the pledge of capital stock in favor of Sellers referred to in
Section 1.4(b)). Other than this Agreement, the Crown Stock is not subject to
any voting trust agreement or other contract, agreement, arrangement, commitment
or understanding restricting or otherwise relating to the voting, dividend
rights or disposition of the Crown Stock.

     5.9.  Financial Statements. Schedule 5.9 sets forth true, correct and
           --------------------
complete copies of (a) the balance sheets of each of Crown Communications,
Network and Mobile as at December 31, 1995 and 1996, and the statements of
income and cash flows of each of Crown Communications, Network and Mobile for
each of the years then ended together with the notes to such financial
statements and, in the case of Crown Communications, the reports thereon of
Peter M. Habib & Associates, independent certified public accountants (with
respect to Crown Communications, the "Crown Audited Statements" and, with
                                      ------------------------
respect to Network and Mobile, the "Crown Unaudited Statements"); and (b) the
                                    --------------------------
balance sheets of each of Crown Communications, Network and Mobile as at May 31,
1997 and the statements of income and cash flows of each of Crown
Communications, Network and Mobile for the five months then ended (together with
the Crown Audited Statements, the Crown Unaudited Statements and the Crown
Interim Financial Statements, the "Crown Financial Statements"). The Crown
                                   --------------------------
Financial Statements have been, or in the case of the Crown Interim Financial
Statements, will be, prepared from the books and records of the Crown Parties
and present fairly (subject, in the case of the Crown Interim Financial
Statements, to normal recurring year-end adjustments) the financial position of
the Crown Communications Business, Network or Mobile, as applicable, as at
December 31, 1995 and 1996, May 31, 1997 and June 30, 1997 and the statements of
income and cash flows of the Crown Communications Business, Network or Mobile,
as applicable, for the periods then ended in conformity with generally accepted
accounting principles ("GAAP") applied on a basis consistent with past practice,
except in each case as described in the notes thereto or as otherwise disclosed
in Schedule 5.9.

     5.10. No Undisclosed Liabilities.
           --------------------------
          (a) There have been no material liabilities or obligations (whether
pursuant to Contracts or otherwise) of any kind whatsoever (whether accrued,
contingent, absolute,

                                      -15-
<PAGE>
 
determined, determinable or otherwise) incurred by the Crown Communications
Business, Network or Mobile since December 31, 1996, other than:

               (i)   liabilities or obligations disclosed or provided for in the
     Crown Interim Balance Sheets or in the notes thereto;

               (ii)  liabilities or obligations incurred or that have arisen in
     the ordinary course of business consistent with past practice which,
     individually and in the aggregate, have not had and would not reasonably be
     expected to have a Crown Material Adverse Effect; or

               (iii) liabilities or obligations under this Agreement or incurred
     in connection with the transactions contemplated hereby.

           (b) On the Closing Date, neither Network nor Mobile will have any
material liabilities or obligations (whether pursuant to Contracts or otherwise)
of any kind whatsoever (whether accrued, contingent, absolute, determined,
determinable or otherwise) other than:

               (i)   trade payables and other accounts payable reflected on the
     balance sheets as of June 30, 1997 of Network and Mobile respectively, and
     those arising thereafter in the ordinary course of business consistent with
     past practice; and

               (ii)  liabilities or obligations under the Sellers Scheduled
     Contracts (as defined herein).

     5.11. Absence of Certain Changes or Events. Since December 31, 1996, the
           ------------------------------------
Crown Parties have made reasonable efforts consistent with past practice to
preserve the Crown Communications Business, Network and Mobile's relationships
with customers, suppliers, lenders, creditors, employees, licensors, licensees,
distributors and others with whom the Crown Communications Business, Network or
Mobile or any of the Crown Parties has a business or financial relationship, and
no such Person or group of persons having a material business or financial
relationship with the Crown Communications Business, Network or Mobile or any of
the Crown Parties has informed any of the Crown Parties that such Person intends
to change or discontinue such relationship, except for such changes or
discontinuances as individually or in the aggregate would not have or be
reasonably expected to have a Crown Material Adverse Effect. Except as set forth
on Schedule 5.11, the Crown Communications Business and the businesses of
Network and Mobile have been conducted in the ordinary course consistent with
past practice (including with respect to the collection of receivables, payment
of payables and other liabilities, advertising activities, sales practices
(including promotions, discounts and concessions), capital expenditures and
inventory levels, and contributions to or accruals to or in respect of Benefit
Plans (as defined herein)) and there has not occurred with respect to the Crown
Communications Business, Network or Mobile:

           (a) any event, occurrence or development which, individually or in
the aggregate, has had or would reasonably be expected to have a Crown Material
Adverse Effect;

                                      -16-
<PAGE>
 
           (b) any damage, destruction or loss not covered by insurance that
would reasonably be expected to have a Crown Material Adverse Effect; provided
                                                                      --------
that any such damage, destruction or loss between the date hereof and the
Closing Date shall be subject to Section 7.1 and upon the Crown Parties' giving
notice to Buyer of the Crown Parties' election to repair such damage,
destruction or loss pursuant to Section 7.1, and such damage, destruction or
loss being repaired to Buyer's satisfaction, such damage, destruction or loss
shall be deemed not to be a failure of the condition set forth in Section 10.1;
provided further that the Crown Parties shall be under no obligation to elect to
- ----------------
repair such damage, destruction or loss; or

           (c) any action taken by any of the Crown Parties which, if taken
after the date hereof, would constitute a breach of the covenant set forth in
Section 7.1.

     5.12. Licenses. None of the Crown Parties owns, holds or uses any Licenses
           --------
which are material to the ownership or operation of the Acquired Business as
currently operated other than the Licenses listed on Schedule 5.12, true and
complete copies of which have been or will be made available to Buyer. Schedule
5.12 identifies the legal holders of all Licenses material to the ownership or
operation of the Acquired Business and whether they are part of the Crown
Communications Business or held by Network or Mobile. Such Licenses are valid
and are in full force and effect and, except as limited by the provisions of the
Communications Act of 1934, as amended (the "Communications Act"), and the FCC's
                                             ------------------
rules, regulations and policies and as otherwise specified on the face of such
Licenses, none of such Licenses is subject to any restriction or condition which
would limit in any material respect the operation of the Acquired Business as it
is presently being conducted. The Crown Parties are familiar with and have
operated the Acquired Business (and any auxiliary assets operated in connection
with the operation of the Acquired Business) at all times in material compliance
with generally accepted industry practices and in compliance in all material
respects with the Licenses, the Communications Act and the existing rules,
regulations and policies of the FCC and the rules and regulations and policies
of the Federal Aviation Administration ("FAA"). Except as shown on Schedule
5.12, no application, action or proceeding is pending for the renewal or
modification of any of the Licenses and there is not now before any Governmental
entity any investigation or complaint against any of the Crown Parties relating
to the Acquired Business the unfavorable resolution of which would impair the
qualifications of any of the Crown Parties to hold any of the Licenses. Except
as shown on Schedule 5.12, no event or events have occurred which, individually
or in the aggregate, and with or without the giving of notice or the lapse of
time or both, would constitute grounds for, or which could result in, the
revocation or termination of any License or the imposition of any restriction or
limitation by any Governmental Entity on the operation of the Acquired Business
or the Crown Communications Business. No Licenses other than those shown on
Schedule 5.12 are necessary or required to operate the Acquired Business as it
is presently being conducted.

     5.13. Sufficiency of Assets. Except for the Excluded Assets, the Acquired
           ---------------------
Business constitutes, and on the Closing Date will constitute, all of the assets
or property used or held for use primarily in the Crown Communications Business
to conduct the Crown Communications Business as the same is now being conducted.
On the Closing Date, the Network Surviving Corporation will have all of the
assets or property used or held for use primarily in the business and operations
of Network to conduct such business and operations as the same is now being

                                      -17-
<PAGE>
 
conducted, and the Mobile Surviving Corporation will have all of the assets or
property used or held for use primarily in the business and operations of Mobile
to conduct such business and operations as the same is now being conducted. On
the Closing Date, the Acquired Business will have access to liquidity and will
have working capital reasonably sufficient to enable it to conduct its business
and operations, including those of Network and Mobile, as the same is now being
conducted and as proposed to be conducted after the Closing as contemplated by
the parties.

     5.14. Assets Other than Real Property Interests. 
           -----------------------------------------
 
           (a) The Crown Parties have good and valid title to all assets
reflected on the December 31, 1996 balance sheets of the Crown Communications
Business, Network and Mobile included in the Crown Financial Statements (the
"December 31 Crown Balance Sheets") or thereafter acquired, except those sold or
 --------------------------------
otherwise disposed of in the ordinary course of business consistent with past
practice and not in violation of this Agreement, in each case free and clear of
all Liens of any kind except (i) such as are set forth on Schedule 5.14, (ii)
mechanics', carriers', workmen's, repairmen's or other like Liens arising or
incurred in the ordinary course of business consistent with past practice, (iii)
Liens which secure debt that is reflected as a liability on the balance sheets
as of June 30, 1997 included in the Crown Interim Financial Statements and other
debt incurred under existing credit facilities and vehicle financings of the
Acquired Business and (iv) other imperfections of title or encumbrances, if any,
which do not, individually or in the aggregate, materially impair the continued
use and operation of the assets to which they relate in the Acquired Business,
as presently conducted (Liens, encumbrances and imperfections of title described
in clauses (i), (ii), (iii) and (iv) above are hereinafter referred to
collectively as "Crown Permitted Liens"). Schedule 5.14 sets forth a list of all
                 ---------------------
material personal property owned by Sellers and used or held for use in
connection with the Crown Communications Business.

           (b) All the material tangible assets used, held for use or necessary
in the Acquired Business (i) have been and are being maintained in accordance
with the customary industry practice, (ii) are free from material defects and
(iii) are in all material respects in good working condition, reasonable wear
and tear and depreciation excepted. All leased personal property used or held
for use in the Acquired Business is in all material respects in the condition
required of such property by the terms of the lease applicable thereto during
the term of the lease and upon the expiration thereof.

     This Section 5.14 does not relate to Real Property or interests in Real
Property, such items being the subject of Section 5.15.

     5.15. Title to Real Property. Schedule 5.15 sets forth a complete list of
           ----------------------
all Real Property and interests in Real Property used or held for use in the
Acquired Business owned in fee by the Crown Parties (individually, a "Crown
                                                                      -----
Owned Property") and identifies any material reciprocal easement or operating
- --------------
agreements (other than such operating agreements not relating to Real Property
identified on other disclosure schedules of the Crown Parties attached hereto)
relating thereto. Schedule 5.15 sets forth a complete list of all Real Property
and interests in Real Property used or held for use in the Acquired Business
leased by the Crown Parties (individually, a "Crown Leased Property") and
                                              ---------------------
identifies any material leases and reciprocal easement or operating agreements
(other than such operating agreements not relating to Real Property 

                                      -18-
<PAGE>
 
identified on other disclosure schedules of the Crown Parties attached hereto)
relating thereto. The Crown Parties have (i) good and insurable fee title to all
Crown Owned Property and (ii) assuming good and adequate title in each lessor of
a leasehold estate, good and valid title to the leasehold estates in all Crown
Leased Property (a Crown Owned Property or Crown Leased Property being sometimes
referred to herein, individually, as a "Crown Property" and, collectively, as
                                        --------------  
"Crown Properties"), in each case free and clear of all Liens and other similar
 ----------------
restrictions of any nature whatsoever, except (A) such as are set forth on
Schedule 5.15, (B) leases, subleases and similar agreements set forth on
Schedule 5.20, (C) Crown Permitted Liens, (D) easements, covenants, rights-of-
way and other similar restrictions of record, (E) any conditions that may be
shown by a current, accurate survey or readily determined by a physical
inspection of any Crown Property made prior to Closing and (F) (I) zoning,
building and other similar restrictions, (II) Liens and other similar
restrictions that have been placed by any developer, landlord or other third
party on property over which the Crown Parties have easement rights or on any
Leased Property and subordination or similar agreements relating thereto, and
(III) unrecorded easements, covenants, rights-of-way and other similar
restrictions, none of which items set forth in clauses (I), (II) and (III),
individually or in the aggregate, materially impair the continued use and
operation of the property to which they relate in the Crown Communications
Business, as presently conducted. Except as disclosed on Schedule 5.18, to the
knowledge of the Crown Parties, the current use by the Crown Parties of the
plants, offices and other facilities located on Crown Property does not violate
any local zoning or similar land use or government regulations in any material
respect (Liens, encumbrances and imperfections of title described in clause (A),
(B), (C), (D), (E) and (F) are hereinafter referred to as "Crown Permitted Real
                                                           --------------------
Estate Liens"). No condemnation of any material portion of the Crown Properties
- ------------
has occurred; and the Crown Parties have not received any notice related to any
future or proposed condemnation of any material portion of the Crown Properties.

     5.16. Intellectual Property.
           ---------------------     
           (a) Schedule 5.16 sets forth a true and complete list of all material
Intellectual Property owned, used, filed by or licensed to the Crown Parties in
connection with the Acquired Business. With respect to registered trademarks,
Schedule 5.16 sets forth a list of all jurisdictions in which such trademarks
are registered or applied for and all registrations and application numbers.
Except as set forth on Schedule 5.16, the Crown Parties own, and the Crown
Parties have the right to use, execute, reproduce, display, perform, modify,
enhance, distribute, prepare derivative works of and sublicenses, without
payment to any other person, all Intellectual Property listed in Schedule 5.16
and, to the knowledge of the Crown Parties, the consummation of the transactions
contemplated hereby will not conflict with, alter or impair any such rights. The
Crown Parties have all rights to Intellectual Property which are necessary in
connection with the Acquired Business as it is presently being conducted.

           (b) The Crown Parties have not granted any licenses or contractual
rights of any kind relating to Intellectual Property listed on Schedule 5.16 or
the marketing or distribution thereof. None of the Crown Parties is bound by or
a party to any Contracts of any kind relating to the Intellectual Property of
any other Person, except as set forth on Schedule 5.16 and except for agreements
relating to computer software licensed to the Crown Parties in the ordinary
course of business consistent with past practice. Subject to the rights of third
parties set forth on 

                                      -19-
<PAGE>
 
Schedule 5.16, all Intellectual Property listed in Schedule 5.16 is free and
clear of the claims of others and of all Liens whatsoever. The conduct of the
Acquired Business as it is presently being conducted and as it is proposed to be
conducted after the Closing as contemplated by the parties does not and will not
violate, conflict with or infringe the Intellectual Property of any other
Person. Except as set forth on Schedule 5.16, (i) no claims are pending or, to
the knowledge of the Crown Parties, threatened against the Crown Parties by any
Person with respect to the ownership, validity, enforceability, effectiveness or
use of any Intellectual Property and (ii) the Crown Parties have not received
any communications alleging that the Crown Parties have violated any rights
relating to Intellectual Property of any Person.

     5.17. Employees.
           ---------
           (a) Except as described in Schedule 5.17, the Crown Parties have no
contracts of employment with any employee and none of the Crown Parties is a
party to or subject to any collective bargaining agreements with respect to the
Crown Communications Business, Network or Mobile. Schedule 5.17 contains a true
and complete list of all officers and key employees and a reasonably complete
list of all other employees, with their job titles and compensation, of the
Crown Communications Business, Network and Mobile as of July 1, 1997.

           (b) No employee of the Crown parties shall (i) be entitled to receive
any termination, severance or deferred compensation payment as a result of the
transactions contemplated by this Agreement or (ii) be entitled to any such
payment in the event that any such employee ceases to be employed in the Crown
Communications Business, by Network or Mobile, upon the Closing.

           (c) Schedule 5.17 lists each "employee benefit plan" (within the
meaning of Section 3(3) of the Employee Retirement Income Security Act of 1974,
as amended ("ERISA"), and each other employment, pension, welfare, savings,
             -----
deferred compensation, severance, termination, holiday, vacation, sick leave,
performance, incentive, bonus, insurance, stock option, stock purchase or other
equity-based plan, program, arrangement or understanding (a "Benefit Plan") with
respect to which the Crown Parties contribute or have any liability in respect
of any present or former employee of the Crown Communications Business, Network
or Mobile (each a "Crown Benefit Plan"). The Crown Parties have made available
                   ------------------
to Buyer true and complete copies of any Crown Benefit Plan and related trust
agreements as in effect on the date hereof and the most recent Form 5500
required to be filed with respect to such Crown Benefit Plan. No event has
occurred since the filing of the most recent Form 5500 that will materially
increase the cost of any Crown Benefit Plan. No Crown Benefit Plan is a
"multiemployer plan" (within the meaning of Section 3(37) of ERISA) and with
respect to the operations of the Acquired Business, the Crown Parties are not
required to contribute to, nor have the Crown Parties maintained or contributed
to or had an obligation to maintain or contribute to, any such plan within the
five full plan years of any such plan immediately prior to the date hereof.

           (d) Each of the Crown Benefit Plans is in compliance in all material
respects with all applicable requirements of ERISA, the Code and other
applicable law. Each of the Crown Benefit Plans has been administered in all
material respects in accordance with its terms. No Crown Benefit Plan which is a
"defined benefit plan" (within the meaning of Section 3(35) of 

                                      -20-
<PAGE>
 
ERISA) has a material amount of unfunded benefit liabilities (within the meaning
of Section 4001(a)(18) of ERISA). No "reportable event" (as defined in Section
4043 of ERISA), "prohibited transaction" (within the meaning of Section 406 of
ERISA or Section 4975 of the Code) or breach of fiduciary responsibility has
occurred with respect to any Crown Benefit Plan which could subject Crown
Communications, Network or Mobile to a material penalty, tax or other liability
under ERISA, the Code or applicable law; there is no pending or, to the
knowledge of the Crown Parties, threatened claim or litigation by any party with
respect to the Crown Benefit Plans, other than routine claims for benefits. None
of the Crown Parties nor any entity required to be treated as a single employer
under Section 414 of the Code or Section 4001 of ERISA has a material actual or
contingent liability under Title IV of ERISA and no condition exists that could
reasonably be expected to give rise to any such liability.

           (e) No Crown Benefit Plan (i) has an "accumulated funding deficiency"
within the meaning of Section 412(a) of the Code as of its most recent plan year
or (ii) has applied for or received a waiver of the minimum funding standards
imposed by Section 412 of the Code; and the Crown Parties have not incurred any
material liability to a Crown Benefit Plan (other than for contributions not yet
due) or to the Pension Benefit Guaranty Corporation (other than for premiums not
yet due).

           (f) No employee of the Crown Parties will be entitled to any
additional benefits or any acceleration of the time of payment or vesting of any
benefits under any Crown Benefit Plan (other than under written employment
contracts listed on Schedule 5.17) as a result of the transactions contemplated
hereby. The deduction of any amount payable under any Crown Benefit Plan shall
not be subject to disallowance under Section 280G of the Code.

           (g) Each Crown Benefit Plan may be amended or terminated after the
Closing without material liability to Buyer, the Network Surviving Corporation
or the Mobile Surviving Corporation. The consummation of the transactions
contemplated by this Agreement shall not give rise to any material liability
with respect to any Crown Benefit Plan. Each Crown Benefit Plan intended to be a
qualified plan under Section 401(a) of the Code has been the subject of a
determination letter from the Internal Revenue Service (the "IRS") to the effect
that such Crown Benefit Plan is qualified and exempt from Federal income taxes
under Sections 401(a) and 501(a), respectively, of the Code, and no event has
occurred that could adversely affect such qualified or exempt status.

     5.18. Litigation. Schedule 5.18 sets forth a list of all pending lawsuits
           ----------
or claims with respect to which any of the Crown Parties has been contacted in
writing by counsel for the plaintiff or claimant against or affecting the
Acquired Business or arising out of the Acquired Business, including litigation
and claims relating to electromagnetic fields, and which (i) relate to or
involve more than $50,000, (ii) seek any material injunctive relief or (iii) may
give rise to any legal restraint on or prohibition against the transactions
contemplated by this Agreement. Except as set forth on Schedule 5.18, to the
knowledge of the Crown Parties, none of the lawsuits or claims listed in
Schedule 5.18 as to which there is at least a reasonable possibility of adverse
determination would have, if so determined, individually or in the aggregate, a
Crown Material Adverse Effect. Except as set forth on Schedule 5.18, to the
knowledge of the Crown Parties, there are no unasserted or threatened claims of
the type that would be required to be disclosed in

                                      -21-
<PAGE>
 
Schedule 5.18. To the knowledge of the Crown Parties, except as set forth on
Schedule 5.18, none of the Crown Parties is a party or subject to or in default
under any material judgment, order, injunction or decree of any Governmental
Entity or arbitration tribunal applicable to it or the Acquired Business. Except
as set forth on Schedule 5.18, there is no lawsuit or claim by any of the Crown
Parties pending, or which any of the Crown Parties intend to initiate, against
any other Person. Except as set forth on Schedule 5.18, to the knowledge of the
Crown Parties, there is no pending or threatened investigation of or affecting
the Acquired Business or the Crown Communications Business by any Governmental
Entity.

     5.19. Brokers. Other than Robert Coury, whose fees will be paid by Sellers,
           -------
there is no investment banker, broker or finder or other Person who will have
any valid claim against any of the Crown Parties for a commission or brokerage
fee in connection with this Agreement or the transactions contemplated hereby as
a result of any agreement of, or action taken by, any of the Crown Parties.

     5.20. Contracts. Except for Contracts listed on Schedule 5.20, none of the
           ---------
Crown Parties is a party to or bound by any Contract relating to or affecting
the Crown Communications Business, Network or Mobile which is a:

           (a) Contract with its agents, suppliers, customers, advertisers,
consultants, advisors, sales representatives, distributors, sales agents or
dealers other than Contracts which by their terms are cancelable by any of the
Crown Parties with notice of not more than 30 days and without cancellation
penalties or severance payments, in the case of any such Contract, in excess of
$50,000;

           (b) covenant not to compete (other than pursuant to any radius
restriction contained in any lease, reciprocal easement agreement or
development, construction, operating or similar agreement) or confidentiality
agreement;

           (c) Contract with any Governmental Entity;

           (d) agreement, Contract or other instrument under which any of the
Crown Parties has borrowed any money from, or issued any note, bond, debenture
or other evidence of indebtedness to, any Person or any other note, bond,
debenture or other evidence of indebtedness issued to any Person;

           (e) Contract (including any so-called take-or-pay, cash deficiency or
keepwell agreement) under which (A) any Person (including any of the Crown
Parties) has directly or indirectly guaranteed indebtedness, liabilities or
obligations of any of the Crown Parties or (B) or any of the Crown Parties has
directly or indirectly guaranteed indebtedness, liabilities or obligations of
any Person, and other than endorsements for the purpose of collection in the
ordinary course of business consistent with past practice and including
agreements having the effect of a guarantee, whether or not required to be
reflected on the Crown Communications Business' Financial Statements in
accordance with GAAP;

                                      -22-
<PAGE>
 
           (f) pledge, security agreement, deed of trust, financial statement or
other document granting a Lien on any of the assets of the Acquired Business
(other than Crown Permitted Liens or Crown Permitted Real Property Liens);

           (g) Contract under which any of the Crown Parties has, directly or
indirectly, made any advance, loan, extension of credit or capital contribution
to, or other investment in, any Person (other than Network or Mobile) in excess
of $50,000;

           (h) Contract under which any of the Crown Parties is lessee of, or
holds or operates, any machinery, equipment, vehicle or other tangible personal
property owned by a third party and used in the Acquired Business or the Crown
Communications Business and which entails payments in any 12-month period, in
the case of any such Contract, in excess of $50,000;

           (i) Contract or other arrangement with (A) any other Crown Party or
any Affiliate of the Crown Parties or (B) any current or former officer,
director or employee, shareholder or with any relative, beneficiary, spouse or
Affiliate of any such Person (a "Related Person") of the Crown Communications
                                 --------------
Business, Network or Mobile or any of their respective affiliates;

           (j) Contract for the sale of any assets of the Acquired Business
(including any capital stock or rights to acquire capital stock of Network or
Mobile) or the grant of any preferential rights to purchase any portion of the
Acquired Business or requiring the consent of any party to the transfer thereof
or otherwise limiting the Crown Parties' ability to sell any assets of the
Acquired Business (including any capital stock or rights to acquire capital
stock of Network or Mobile);

           (k) Contract not made in the ordinary course of business consistent
with past practice, including any joint venture or partnership arrangement or
any agreement relating to any merger or acquisition involving any of the Crown
Parties; or

           (l) Contract whether or not made in the ordinary course of business,
which is material to the Acquired Business or the termination of which would
reasonably be expected to have a Crown Material Adverse Effect.

The Crown Parties are not, and to the knowledge of the Crown Parties, no other
party is (with or without the lapse of time or the giving of notice or both) in
default in any material respect under any Contract, License or instrument
required to be set forth in the Crown Parties disclosure schedules (each, a
"Seller Scheduled Contract"). The Crown Parties have made available to Buyer or
 -------------------------
its Representatives true and complete copies of all Seller Scheduled Contracts.
Each Seller Scheduled Contract is in full force and effect and constitutes a
legal, valid and binding obligation of Sellers, Network or Mobile, as the case
may be, and, to the knowledge of the Crown Parties, the other parties thereto,
enforceable in accordance with its terms. The Crown Parties have not received
any written notice of the intention of any party to terminate any Seller
Scheduled Contract.

                                      -23-
<PAGE>
 
     5.21. Compliance with Laws. Except as set forth on Schedule 5.21, the
           --------------------
operations of the Crown Communications Business, Network and Mobile are not now
being conducted and, to the knowledge of the Crown Parties, have not been
conducted in violation of any applicable law, ordinance, statute, rule or
regulation of any Governmental Entity except for violations which do not and
will not, individually or in the aggregate, have or reasonably be expected to
have a Crown Material Adverse Effect. None of the Crown Parties has received any
notice from any Governmental Entity that the operations of the Crown
Communications Business, Network and Mobile are being conducted in violation of
any applicable law, ordinance, statute, rule or regulation of any Governmental
Entity, or of any investigation or review pending or threatened by any
Governmental Entity investigating or reviewing any alleged violation, which
violation individually or in the aggregate with all other violations would have
or would reasonably be expected to have a Crown Material Adverse Effect. Except
as set forth on Schedule 5.21, all the Real Property included in the assets of
the Acquired Business is in compliance with applicable laws, including zoning,
land use and building code laws, ordinances and regulations necessary to conduct
the operations of the Acquired Business and the Crown Communications Business as
presently conducted, and the transactions contemplated by this Agreement could
not reasonably be expected to result in the revocation of any permit or
variance, except to the extent that any such non-compliance or violation or
revocation, individually or in the aggregate, would not have or would not
reasonably be expected to have a Crown Material Adverse Effect.

     5.22. Environmental Matters.
           ---------------------

           (a) Except as set forth on Schedule 5.22, the Crown Parties are in
compliance with all Environmental Laws (as defined herein), except for instances
of non-compliance that, individually or in the aggregate, do not or will not
have or would not reasonably be expected to result in a Crown Material Adverse
Effect. No Lien has attached to any Crown Property or facility of the Crown
Communication Business, Network or Mobile pursuant to any Environmental Laws.
Except as set forth on Schedule 5.22, there have been no Releases of Hazardous
Material, as both terms are defined herein, by any of the Crown Parties or, to
the knowledge of the Crown Parties, by any other Person, in, on, under or
affecting any Crown Property or facility of the Crown Communications Business,
Network or Mobile, and the Crown Parties have not disposed of any Hazardous
Material in a manner that in either case, individually or in the aggregate,
could reasonably be expected to result in a Crown Material Adverse Effect.
Except as set forth on Schedule 5.22, prior to the period of ownership or
operation by any of the Crown Parties of any Crown Property or facility of the
Crown Communications Business, Network or Mobile, to the knowledge of the Crown
Parties, no Hazardous Material was generated, treated, stored, disposed of,
used, handled or manufactured at, or transported, shipped or disposed of from,
such currently or previously owned properties and, except as set forth on
Schedule 5.22, to the knowledge of the Crown Parties, there were no Releases of
Hazardous Material in, on, under or affecting any such property. Except as set
forth on Schedule 5.22, there are no sites, locations or operations for which
any of the Crown Parties have received notice that it is or may be responsible
for any remedial or response action, as defined in any Environmental Law,
relating to any Release of Hazardous Material. Schedule 5.22 sets forth a list
of any and all environmental audits of any Crown Property or facility of the
Crown Communications Business, Network or Mobile conducted by the Crown Parties
during their ownership of the Crown Communications Business, Network or Mobile,
or obtained by, or performed on behalf of, any of 

                                      -24-
<PAGE>
 
the Crown Parties in connection with its acquisition of the Crown Communications
Business, Network or Mobile, and any environmental audits in the Crown Parties'
possession of any Crown Property or facility adjacent to the Crown
Communications Business, Network or Mobile which relate to any facts, conditions
or circumstances that have resulted, or may result, in a Release of Hazardous
Material at or under any Crown Property or facility of the Crown Communications
Business, Network or Mobile (collectively, the "Crown Environmental Audits").
                                                --------------------------
Sellers have made copies of all Crown Environmental Audits available to Buyer.

           (b) The Crown Parties have obtained, and are in compliance in all
material respects with, all permits, licenses, authorizations, registrations and
other governmental consents required by applicable Environmental Laws
("Environmental Permits"). Except as disclosed on Schedule 5.22, the Crown
  ---------------------
Parties have not received notice of any civil, criminal or administrative claims
or proceedings, pending or threatened, that are based on or related to any
Environmental Laws or the failure to comply with any terms and conditions of any
Environmental Permits which claims or proceedings of which failure to comply,
individually or in the aggregate, would have or reasonably be expected to result
in a Crown Material Adverse Effect. To the knowledge of the Crown Parties,
except as described in Schedule 5.22, (i) there are no polychlorinated biphenyls
("PCBs") in any container or equipment on, about, under or within any Crown
  ----
Property or facility of the Crown Communications Business, Network or Mobile,
(ii) there is no asbestos at, on, about, under or within any Crown Property or
facility of the Crown Communications Business, Network or Mobile, and (iii)
there are no underground storage tanks, whether in service or closed in place,
under any Crown Property or facility of the Crown Communications Business,
Network or Mobile.

           (c) The term "Environmental Laws" means laws relating to the
                         ------------------
contamination, pollution or preservation of the environment or to human health.
The term "Release" has the meaning set forth in the Comprehensive Environmental
          -------
Response, Compensation, and Liability Act, as amended by the Superfund
Amendments and Reauthorization Act, 42 U.S.C. (S) 9601(22). The term "Hazardous
                                                                      ---------
Material" means (1) hazardous materials, pollutants, contaminants, constituents,
- --------
medical or infectious wastes, hazardous wastes and hazardous substances as those
terms are defined in any Environmental Law, (2) petroleum, including crude oil
and any by-products or fractions thereof, (3) natural gas, synthetic gas and any
mixtures thereof, (4) asbestos and/or asbestos-containing material, (5) radon
and (6) PCBs or materials or fluids containing PCBs.

     5.23. Taxes.
           -----

           (a) For purposes of this Agreement "Taxes" shall mean all Federal,
                                               -----
state, local and foreign taxes or similar charges, including all income,
franchise, real property, withholding, employment, sales, excise and transfer
taxes and any interest and penalties thereon. The Crown Parties have timely
filed or caused to be timely filed, or will timely file or cause to be timely
filed on or prior to the Closing Date, all Tax returns and Tax reports which are
required to be filed (including proper filing extensions) on or prior to the
Closing date by Network or Mobile or the Crown Communications Business (the
"Returns"). All the Returns were or will be, as the case may be, complete and
 -------
correct in all material respects at the time of filing. All Taxes due and
payable with respect to taxable periods covered by the Returns, or with respect
to which 

                                      -25-
<PAGE>
 
Network, Mobile or the Crown Communications Business is or might be otherwise be
liable (including Taxes which Network, Mobile or the Crown Communications
Business may have been required to withhold from amounts owing to any
stockholder, employee, creditor or third party), have been, or prior to the
Closing Date will be, timely paid. None of the Crown Communication Business,
Network or Mobile is delinquent in the payment of any Tax, or has any Tax
deficiencies proposed, assessed, or to the knowledge of the Crown Parties,
threatened against it. No Liens for Taxes exist with respect to any assets of
the Crown Communications Business, Network or Mobile.

           (b) Schedule 5.23(b) sets forth the tax years through which the
Returns have been examined and closed or are returns with respect to which the
applicable period for assessment under applicable law, after giving effect to
extensions or waivers, has expired. Any deficiencies resulting from any Federal,
state, local or foreign audits or examinations of Network, Mobile or the Crown
Communications Business have been paid in full. There are no present audits,
disputes or proceedings as to any Taxes of Network, Mobile or the Crown
Communications Business. No material issued were raised in writing during any
audit, dispute or proceeding of Network, Mobile or the Crown Communications
Business that might apply to any taxable period subsequent to the taxable period
covered by such audit, dispute or proceeding. No power of attorney with respect
to Taxes of Network, Mobile or the Crown Communications Business has been filed
with any taxing jurisdiction or authority. None of the Crown Communication
Business, Network or Mobile has executed any waiver of the statute of
limitations on the assessment or collection of any Tax.

           (c) Each of Network and Mobile, and all of its current or former
shareholders, have consented to a valid election for its first taxable year or
period, which election has not been revoked or terminated or otherwise become
ineffective for any subsequent taxable year or period, under Section 1362(a) of
the Code, to be taxed as an "S Corporation" under Sections 1361 through 1379 of
the Code. Each of Network and Mobile, and all of its current or former
shareholders, have consented to a valid election, which election has not been
revoked or terminated or otherwise become ineffective, to be taxed in a
comparable fashion under comparable state, local or foreign Tax law, for each of
the taxable periods by each of the taxing jurisdictions set forth on Schedule
5.23(c). Network, Mobile and the Crown Communications Business do not file, and
are not required to file, state or local Tax returns in any states or localities
other than those listed on Schedule 5.23(c). None of the assets of Network or
Mobile are of a type described in Section 1374(d)(8) of the Code.

           (d) None of the Crown Communication Business, Network or Mobile is a
party to or bound by any agreement (including any tax sharing agreement),
election or extension of the statute of limitations with respect to taxes. None
of the Crown Communications Business, Network or Mobile is or has ever been a
member of an affiliated, consolidated, combined or unitary group of which any
corporation other than Network or Mobile also is or was a member.

           (e) Neither Network nor Mobile is a party to, and none of the assets
of Network, Mobile or the Crown Communications Business is subject to, any lease
made pursuant to Section 168(f)(8) of the Internal Revenue Code of 1954. No
assets of Network, Mobile or the 

                                      -26-
<PAGE>
 
Crown Communications Business is "tax exempt use property" within the meaning of
Section 168(h) of the Code.

           (f) Neither Network nor Mobile has taken any action that would
require it to include in income any adjustment under Section 481(a) of the Code
by reason of a change in accounting method initiated by Network or Mobile, and
the Internal Revenue Service has not proposed for any open Tax year any such
adjustment or change in accounting method. Neither Network nor Mobile will be
required to include in a taxable period (or portion thereof) beginning on or
after the Closing Date taxable income attributable to income that economically
accrued in a prior taxable period (or portion thereof), including as a result of
the installment method of accounting, the completed contract method of
accounting or the cash method of accounting.

     5.24. Insurance. The Crown Parties maintain policies of fire and casualty,
           ---------
liability and other forms of insurance with respect to the Crown Communications
Business, Network and Mobile in such amounts, with such deductibles and against
such risks and losses as are customary in the business in which they are
engaged. The insurance policies currently owned and maintained by the Crown
Parties are listed in Schedule 5.24.

     All such policies are in full force and effect, all premiums due and
payable thereon have been paid (other than retroactive or retrospective premium
adjustments that are not yet, but may be, required to be paid with respect to
any period ending prior to the Closing Date), and no notice of cancellation or
termination has been received with respect to any such policy which has not been
replaced on substantially similar terms prior to the date of such cancellation.
The activities and operations of the Crown Communications Business, Network and
Mobile have been conducted in a manner so as to conform in all material respects
to all applicable provisions of such insurance policies.

     5.25. Accounts Receivable. All the accounts receivable included in the
           -------------------
Acquired Business (i) do and on the Closing Date will represent actual
indebtedness incurred by the applicable account debtors, (ii) have and on the
Closing Date will have arisen in the ordinary course of business consistent with
past practice and (iii) are and on the Closing Date will be subject to no prior
assignment, claim, Lien, dispute or unapplied credit of any nature whatsoever
other than Crown Permitted Liens.

     5.26. Securities Act. The shares of Castle B Common Stock acquired by the
           --------------
Crowns in the Mergers and the Note are being acquired by the Crowns for
investment only and not with a view to any public distribution thereof, and the
Crowns shall not offer to sell or otherwise dispose of the shares so acquired by
them in violation of the registration requirements of the Securities Act of 1933
(the "Securities Act"). Each Seller is an "accredited investor" within the
      --------------
meaning of Rule 501 under the Securities Act and has sufficient knowledge and
experience in business and investment matters so as to be able to evaluate the
risks and merits of an investment in Buyer and, after the Closing, he or she is
each financially able to bear the risks of such investment, including the risk
of a complete loss of its investment in Buyer.

     5.27. Transactions with Affiliates. Except as set forth in Schedule 5.27,
           ----------------------------
none of the Seller Scheduled Contracts between the Crown Communications
Business, Network or Mobile, 

                                      -27-
<PAGE>
 
on the one hand, and Sellers or any Affiliates or Related Persons of the Crown
Parties, on the other hand, will continue in effect subsequent to the Closing.
Except as set forth in Schedule 5.27, after the Closing neither Sellers nor any
Affiliate or Related Person of the Crown Parties will have any interest in any
property (real or personal, tangible or intangible) or Contract used in or
pertaining to the acquired Business. Neither Sellers nor any Affiliate or
Related Person of the Crown Parties has any direct or indirect ownership
interest in any Person in which the Crown Communications Business, Network or
Mobile has any direct or indirect ownership interest or with which the Crown
Communications Business, Network or Mobile competes or has a business
relationship. Except as set forth in Schedule 5.27, none of Sellers or any
Affiliates or Related Persons of the Crown Parties provide any material services
to the Crown Communications Business, Network or Mobile.

     5.28. Disclosure. No statement of Sellers contained in this Article 5, in
           ----------
Exhibit D, in any of the disclosure schedules referred to in Article 5 or in any
certificates delivered by any of the Crown Parties pursuant to Section 1.1(k),
Section 4.2(d) and Section 7.1(c) intentionally contains any untrue statement of
a material fact or intentionally omits to state a material fact necessary to
make the statements contained herein or therein, in light of the circumstances
in which they are made, not misleading.

                                   ARTICLE 6.

                     Representations and Warranties of Buyer
                     ---------------------------------------

     6.1.  Corporate Status; Authority. Each of Buyer and its Subsidiaries and
           ---------------------------
CTSH and its Subsidiaries is a corporation, partnership or other entity duly
organized, validly existing and in good standing under the laws of the
jurisdiction of its incorporation or organization. Each of Buyer and its
Subsidiaries and CTSH and its Subsidiaries is duly qualified and in good
standing to do business as a foreign corporation in each jurisdiction in which
the conduct or nature of its business or the ownership, leasing or holding of
its properties makes such qualification necessary, except such jurisdictions
where the failure to be so qualified or in good standing, individually or in the
aggregate, would not reasonably be expected to have a material adverse effect
(i) on the condition (financial or otherwise), business, liabilities,
properties, assets, prospects or results of operations of Buyer and its
Subsidiaries and CTSH and its Subsidiaries, taken as a whole, or (ii) on the
ability the buyer or its Subsidiaries to perform their obligations under or to
consummate the transactions contemplated by this Agreement (a "Buyer Material
                                                               --------------
Adverse Effect"). Each of Buyer and its Subsidiaries and CTSH and its
- --------------
Subsidiaries has all requisite corporate power to carry on its business as it is
now being conducted, to own and operate such business and each of Buyer, CAC I
and CAC II has all requisite corporate power to enter into this Agreement, to
perform its obligations hereunder and to complete the transactions contemplated
hereby.

     6.2.  Corporate Action. All corporate and shareholder actions and
           ----------------
proceedings necessary to be taken by or on the part of Buyer, CAC I and CAC II,
as applicable, in connection with the transactions contemplated by the Buyer
Transaction Documents 
have been duly and validly taken, and this Agreement has
been duly and validly authorized, executed and delivered by Buyer, CAC I and CAC
II and constitutes, and each of the other Buyer Transaction Documents 

                                      -28-
<PAGE>
 
will be duly and validly authorized, executed and delivered by Buyer and will
constitute, the legal, valid and binding obligations of Buyer, CAC I and CAC II,
as applicable, enforceable against Buyer, CAC I and CAC II, as applicable, in
accordance with and subject to its terms, except as may be limited by bankruptcy
or other laws affecting creditors' rights and by equitable principles.

     6.3.  No Conflicts. Except as set forth on Schedule 6.3, neither the
           ------------
execution, delivery and performance by Buyer, CAC I or CAC II, as applicable, of
the Buyer Transaction Documents, nor the consummation by Buyer, CAC I and CAC II
of the transactions contemplated thereby is an event that, by itself or with the
giving of notice or the passage of time or both, will (i) conflict with the
certificate of incorporation or by-laws, as amended, of Buyer or the articles of
incorporation or by-laws of CAC I or CAC II, (ii) constitute a violation of, or
conflict with or result in any breach of or any default under, or constitute
grounds for termination or acceleration of, any mortgage, indenture, lease,
contract, agreement (including, without limitation, the agreement between the
British Broadcasting Corporation, CTSH and/or its Affiliates (the "BBC
                                                                   ---
Agreement") and the credit agreement between the Buyer and KeyBank National
- ---------
Association dated as of April 26, 1995 (as amended, the "Bank Credit
                                                         -----------
Agreement")) or instrument to which Buyer, any of its Subsidiaries, CAC I, CAC
- ---------
II, CTSH or any of its Subsidiaries is a party or by which it is bound, except
for such violations, conflicts, breaches, terminations and accelerations as
individually or in the aggregate would not have or be reasonably expected to
have a Buyer Material Adverse Effect or result in the creation of any material
Lien upon any of Buyer's assets such that it is reasonably likely that Buyer,
CAC I and CAC II will be unable to proceed with the transactions contemplated in
this Agreement or (iii) violate (A) any judgment, decree or order or (B) any
statute, rule or regulation, in each such case, applicable to Buyer, CAC I or
CAC II. The execution, delivery and performance by Buyer, CAC I and CAC II of
this Agreement, and by Buyer of the Shareholder Agreement, and the consummation
by Buyer, any of its Subsidiaries, CAC I, CAC II, CTSH or any of its
Subsidiaries of the transactions contemplated hereby or thereby, require no
action by or in respect of, or filing with, any Governmental Entity other than
(a) the filing of articles of merger with the Department of State of the
Commonwealth of Pennsylvania and of appropriate documentation with the relevant
authorities of other states in which CAC I or CAC II is qualified to do
business; (b) compliance with any applicable requirements of the Hart-Scott-
Rodino Act; (c) the approvals of the FCC contemplated by this Agreement; (d)
actions or filings which, if not taken or made, would not, individually or in
the aggregate, reasonably be expected to have a Buyer Material Adverse Effect;
and (e) filings and notices not required to be made or given until after the
Effective Time.

     6.4.  Capitalization of Buyer and its Subsidiaries and CTSH and its
           -------------------------------------------------------------
Subsidiaries.
- ------------

           (a) The authorized capital stock of Buyer consists of 270,000 shares
of Class A Common Stock, par value $0.01 per share ("Castle A Common Stock"), of
                                                     ---------------------
which 208,313 are duly authorized and validly issued and outstanding, fully paid
and nonassessable; 7,000,000 shares of Castle B Common Stock, par value $0.01
per share, of which 297,666 are duly authorized and validly issued and
outstanding, fully paid and nonassessable; and 5,777,733 shares of Preferred
Stock, par value $0.01 per share ("Preferred Stock"), of which 5,777,733 are
                                   ---------------
duly authorized and validly issued and outstanding, fully paid and
nonassessable. A total of 584,000 shares of Castle B Common Stock are reserved
for issuance under Buyer's 1995 Stock Option Plan and a total of 6,095,014
shares of Castle B Common Stock are reserved for the conversion of Castle A

                                      -29-
<PAGE>
 
Common Stock and Preferred Stock of Buyer. Except as set forth in this Section
6.4(a) and except for transactions contemplated by this Agreement there are
outstanding no shares of capital stock or other equity securities of Buyer.
Schedule 6.4(a) sets forth for each Subsidiary of Buyer the amount of its
authorized capital stock, the amount of its outstanding capital stock and the
record and beneficial owners of its outstanding capital stock. All the
outstanding shares of capital stock of each Subsidiary have been duly authorized
and validly issued and are fully paid and nonassessable. Except as set forth on
Schedule 6.4(a), there are no shares of capital stock or other equity securities
of any Subsidiary of Buyer outstanding. Neither the shares of capital stock of
Buyer nor those of any of its Subsidiaries have been issued in violation of, and
except as set forth on Schedule 6.4, none of such shares are subject to, any
purchase option, call, right of first refusal, preemptive, subscription or
similar rights under any provision of applicable law, the certificate of
incorporation, as amended, or by-laws of Buyer or the comparable governing
instruments of any of its Subsidiaries, any Contract to which Buyer or any of
its Subsidiaries is subject, bound or a party or otherwise. Except as indicated
above or as set forth on Schedule 6.4(a), there are no outstanding warrants,
options, rights, "phantom" stock rights, agreements, convertible or exchangeable
securities or other commitments (other than this Agreement and Buyer's financing
commitments dated as of June 27, 1997 from Lehman Brothers Inc., copies of which
have been made available to Sellers) (i) pursuant to which Buyer or any of its
Subsidiaries is or may become obligated to issue, sell, purchase, return or
redeem any shares of capital stock or other securities of Buyer or any of its
Subsidiaries or (ii) that give any Person the right to receive any benefits or
rights similar to any rights enjoyed by or accruing to holders of shares of
capital stock of Buyer or any of its Subsidiaries. Except as set forth above or
on Schedule 6.4(a), there are no equity securities of Buyer or any of its
Subsidiaries reserved for issuance for any purpose. Except as set forth on
Schedule 6.4(a), Buyer has good and valid title, directly or through one or more
wholly owned Subsidiaries, to all the outstanding shares of capital stock of
each such Subsidiary, free and clear of any Liens and restrictions of any kind.
There are no outstanding bonds, debentures, notes or other securities having the
right to vote on any matters on which stockholders of Buyer or any of its
Subsidiaries may vote.

     (b) The authorized share capital of CTSH consists of 11,477,290 ordinary
shares, par value 1p per share ("CTSH Stock"), all of which are duly authorized
                                 ----------
and validly issued and outstanding, fully paid and nonassessable and held of
record by the Persons named in Schedule 6.4(b) in the respective amount shown
therein. Except as set forth in this Section 6.4(b) and except for transactions
contemplated by this Agreement there are outstanding no shares of capital stock
or other equity securities of CTSH. Schedule 6.4(b) sets forth for each
Subsidiary of CTSH the amount of its authorized share capital, the amount of its
outstanding capital stock and the record and beneficial owners of its
outstanding shares. All the outstanding shares of capital stock of each
Subsidiary of CTSH have been duly authorized and validly issued and are fully
paid and nonassessable. Except as set forth on Schedule 6.4(b), there are no
shares of capital stock or other equity securities of any Subsidiary of CTSH
outstanding. Neither the shares of capital stock of CTSH nor those of any of its
Subsidiaries have been issued in violation of, and except as set forth on
Schedule 6.4(b), none of such shares are subject to, any purchase option, call,
right of first refusal, preemptive, subscription or similar rights under any
provision of applicable law or any charter documents of CTSH or the comparable
governing instruments of any of its Subsidiaries, any Contract to which CTSH or
any of its Subsidiaries is subject, bound or a party 

                                      -30-
<PAGE>
 
or otherwise. Except as indicated above or as set forth in Schedule 6.4(b),
there are no warrants, options, rights, "phantom" stock rights, agreements,
convertible or exchangeable securities or other commitments (other than this
Agreement) outstanding as of the date hereof or as to which CTSH will be or is
likely to become bound or obligated in connection with the financing by Buyer of
the transactions contemplated hereby (i) pursuant to which CTSH or any of its
Subsidiaries is or may become obligated to issue, sell, purchase, return or
redeem any shares of capital stock or other securities of CTSH or any of its
Subsidiaries or (ii) that give any Person the right to receive any benefits or
rights similar to any rights enjoyed by or accruing to holders of share capital
of CTSH or any of its Subsidiaries. Except as set forth above or on Schedule
6.4(b), there are no equity securities of CTSH or any of its Subsidiaries
reserved for issuance for any purpose. Except as set forth on Schedule 6.4(b),
CTSH has good and valid title, directly or through one or more wholly owned
Subsidiaries, to all the outstanding shares of capital stock of each of its
Subsidiaries, free and clear of any Liens and restrictions of any kind. There
are no outstanding bonds, debentures, notes or other securities having the right
to vote on any matters on which stockholders of CTSH or any of its Subsidiaries
may vote.

     6.5.  Equity Interests. Except as set forth on Schedule 6.5 hereto, Buyer
           ----------------
does not directly or indirectly own any capital stock of or other equity
interests in any corporation, partnership or other Person and neither Buyer nor
any of its Subsidiaries is a member of or participant in any partnership, joint
venture, limited liability company, limited liability partnership or similar
Person.

     6.6.  Financial Statements.
           --------------------

           (a) Schedule 6.6(a) sets forth true, correct and complete copies of
(i) the balance sheet of Buyer and its consolidated Subsidiaries as at December
31, 1995, and December 31, 1996, and the statements of income and cash flows of
Buyer and its consolidated Subsidiaries for each of the years then ended,
together with the notes thereto and report thereon of KPMG Peat Marwick LLP,
independent public accountants (the "Buyer Audited Statements"); and (ii) the
                                     ------------------------
balance sheet of Buyer and its consolidated Subsidiaries as at May 31, 1997 and
the statements of income and cash flows of Buyer and its consolidated
Subsidiaries for the five months then ended (together with the Buyer Audited
Statements and the Buyer Interim Financial Statements, the "Buyer Financial
                                                            ---------------
Statements"). The Buyer Financial Statements have been, or in the case of the
- ----------
Buyer Interim Financial Statements, will be, prepared from the books and records
of Buyer and present fairly (subject, in the case of the Buyer Interim Financial
Statements, to normal recurring year-end adjustments) the financial position of
Buyer and its consolidated Subsidiaries as at December 31, 1995 and 1996, May
31, 1997 and June 30, 1997 and the statements of income and cash flows of Buyer
and its consolidated Subsidiaries for the periods then ended in conformity with
GAAP applied on a basis consistent with past practices (except in each case as
described in the notes thereto or as otherwise disclosed in Schedule 6.6(a)).

           (b) Schedule 6.6(b) sets forth true, correct and complete copies of
(i) the balance sheet of CTSH and its consolidated Subsidiaries as at March 31,
1997, and the consolidated profit and loss account and consolidated cash flow
statement for the seven-month period ended March 31, 1997, together with the
notes and report thereon of KPMG, Chartered Accountants (the "CTSH Audited
                                                              ------------
Statements"); and (ii) the CTSH Interim Financial Statements 
- ----------

                                      -31-
<PAGE>
 
(collectively, together with the CTSH Audited Statements, the "CTSH Financial
                                                               --------------
Statements"). The CTSH Financial Statements have been prepared from the books
- ----------
and records of CTSH and give a true and fair view of the state of affairs of
CTSH and its consolidated Subsidiaries as at March 31, 1997 and of their
consolidated profit for the period then ended and have been properly prepared in
accordance with the U.K. Companies Act 1985 (as if those requirements were to
apply) applied on a basis consistent with past practices (except in each case as
described in the notes thereto or as otherwise disclosed in Schedule 6.6(b).

     6.7.  No Undisclosed Liabilities. Except as set forth on Schedule 6.7,
           --------------------------             
there have been no material liabilities or obligations (whether pursuant to
Contracts or otherwise) of any kind whatsoever (whether accrued, contingent,
absolute, determined, determinable or otherwise) incurred by Buyer or any of its
Subsidiaries since December 31, 1996, or incurred by CTSH or any of its
Subsidiaries since March 31, 1997, other than:

           (a) liabilities or obligations disclosed or provided for in the
balance sheet of Buyer and its Subsidiaries as of June 30, 1997 included in the
Buyer Interim Financial Statements or the balance sheet of CTSH and its
consolidated Subsidiaries as of June 30, 1997 included in the CTSH Interim
Financial Statements or in the notes to the Buyer Interim Financial Statements
or the CTSH Interim Financial Statements.

           (b) liabilities or obligations incurred or that have arisen in the
ordinary course of business consistent with past practice which, individually
and in the aggregate have not had and would not reasonably be expected to have a
Buyer Material Adverse Effect; or

           (c) liabilities or obligations under this Agreement or incurred in
connection with the transactions contemplated hereby.

     6.8.  Absence of Certain Changes or Events. Since December 31, 1996, the
           ------------------------------------
business of Buyer and its Subsidiaries has been conducted in the ordinary course
consistent with past practice (including with respect to the collection of
receivables, payment of payables and other liabilities, advertising activities,
sales practices (including promotions, discounts and concessions), capital
expenditures and inventory levels, and contributions to or accruals to or in
respect of Benefit Plans). There has not occurred with respect to the business
of Buyer and its Subsidiaries since December 31, 1996 or with respect to the
business of CTSH and its Subsidiaries since March 31, 1997:

           (a) any event, occurrence or development which, individually or in
the aggregate, has had or would reasonably be expected to have a Buyer Material
Adverse Effect.

           (b) any action taken by the Buyer or any of its Subsidiaries which,
if taken after the date hereof, would constitute a breach of the covenant set
forth in Section 8.1.

     6.9.  Licenses. None of Buyer or any of its Subsidiaries owns, holds or
           --------
uses any Licenses which are material to the ownership or operation of their
respective businesses other than the Licenses listed on Schedule 6.9, true and
complete copies of which have been made available to Sellers. Schedule 6.9
identifies the legal holders of all Licenses relating to the

                                      -32-
<PAGE>
 
business of Buyer or any of its Subsidiaries. Such Licenses are valid and are in
full force and effect and, except as limited by the provisions of the
Communications Act, and the FCC's rules, regulations and policies and as
otherwise specified on the face of such Licenses, none of such Licenses is
subject to any restriction or condition which would limit in any material
respect the operation of any business of Buyer or any of its Subsidiaries as it
is presently being conducted. Buyer and its Subsidiaries are familiar with and
have operated their respective businesses (and any auxiliary assets operated in
connection with the operation of such businesses) at all times in material
compliance with generally accepted industry practices and in compliance in all
material respects with the Licenses, the Communications Act and the existing
rules, regulations and policies of the FCC and the rules and regulations and
policies of the FAA. Except as shown on Schedule 6.9, no application, action or
proceeding is pending for the renewal or modification of any of the Licenses and
there is not now before any Governmental Entity any investigation or complaint
against Buyer or any of its Subsidiaries the unfavorable resolution of which
would impair the qualifications of any of Buyer or any of its Subsidiaries to
hold any of the Licenses. Except as shown on Schedule 6.9, no event or events
have occurred which, individually or in the aggregate, and with or without the
giving of notice or the lapse of time or both, would constitute grounds for, or
which could result in, the revocation or termination of any License or the
imposition of any restriction or limitation by any Governmental Entity on the
operation of the businesses of Buyer or any of its Subsidiaries. No Licenses
other than those shown on Schedule 6.9 are necessary or required to operate any
business of Buyer or its Subsidiaries as it is presently being conducted.

         6.10.    Assets Other than Real Property Interests.
                  -----------------------------------------

                  (a)   Buyer and its Subsidiaries have good and valid title to
all assets reflected on the December 31, 1996 balance sheet of Buyer and its
consolidated Subsidiaries included in the Buyer Financial Statements (the
"December 31 Buyer Balance Sheet") or thereafter acquired, except those sold or
 -------------------------------
otherwise disposed of in the ordinary course of business consistent with past
practice and not in violation of this Agreement, in each case free and clear of
all Liens of any kind except (i) such as are set forth on Schedule 6.10, (ii)
mechanics', carriers', workmen's, repairmen's or other like Liens arising or
incurred in the ordinary course of business consistent with past practice, (iii)
Liens which secure debt that is reflected as a liability on the balance sheets
as of June 30, 1997 included in the Buyer Interim Financial Statements and other
debt incurred under existing credit facilities of Buyer or its Subsidiaries and
(iv) other imperfections of title or encumbrances, if any, which do not,
individually or in the aggregate, materially impair the continued use and
operation of the assets to which they relate, as presently conducted (Liens,
encumbrances and imperfections of title described in clauses (i), (ii), (iii)
and (iv) above are hereinafter referred to collectively as "Buyer Permitted
                                                            ---------------
Liens"). Schedule 6.10 sets forth a list of all material personal property owned
- -----
by Buyer and its Subsidiaries and used or held for use in connection with their
respective businesses.

                  (b)   All the material tangible assets used, held for use or
necessary in the operation of the businesses of Buyer and its Subsidiaries (i)
have been and are being maintained in accordance with the customary industry
practice, (ii) are free from material defects and (iii) are in all material
respects in good working condition, reasonable wear and tear and depreciation
excepted. All leased personal property used, or held for use or necessary in the
operation of the 

                                      -33-
<PAGE>
 
businesses of Buyer and its Subsidiaries is in all material respects in the
condition required of such property by the terms of the lease applicable thereto
during the term of the lease and upon the expiration thereof. 

         This Section 6.10 does not relate to Real Property or interests in Real
Property, such items being the subject of Section 6.11.

         6.11.    Title to Real Property.  Schedule 6.11 sets forth a complete
                  ----------------------
list of all Real Property and interests in Real Property used or held for use in
the operation of the businesses of Buyer and its Subsidiaries and owned in fee
by Buyer or any of its Subsidiaries (individually, a "Buyer Owned Property") and
                                                      --------------------
identifies any material reciprocal easement or operating agreements (other than
such operating agreements not relating to Real Property identified on other
disclosure schedules of Buyer attached hereto) relating thereto. Schedule 6.11
sets forth a complete list of all Real Property and interests in Real Property
used, or held for use in the operation of the businesses of Buyer and its
Subsidiaries leased by Buyer or any of its Subsidiaries (individually, a "Buyer
                                                                          -----
Leased Property") and identifies any material leases and reciprocal easement or
- ---------------
operating agreements (other than such operating agreements not relating to Real
Property identified on other disclosure schedules of Buyer attached hereto)
relating thereto. Buyer and its Subsidiaries have (i) good and insurable fee
title to all Buyer Owned Property and (ii) assuming good and adequate title in
each lessor of a leasehold estate, good and valid title to the leasehold estates
in all Buyer Leased Property (a Buyer Owned Property or Buyer Leased Property
being sometimes referred to herein, individually, as a "Buyer Property" and,
                                                        --------------
collectively, as "Buyer Properties"), in each case free and clear of all Liens
                  ----------------
and other similar restrictions of any nature whatsoever, except (A) such as are
set forth on Schedule 6.11, (B) leases, subleases and similar agreements set
forth on Schedule 6.16, (C) Buyer Permitted Liens, (D) easements, covenants,
rights-of-way and other similar restrictions of record, (E) any conditions that
may be shown by a current, accurate survey or readily determined by a physical
inspection of any Buyer Property made prior to Closing and (F) (I) zoning,
building and other similar restrictions, (II) Liens and other similar
restrictions that have been placed by any developer, landlord or other third
party on property over which the Buyer Parties have easement rights or on any
Buyer Leased Property and subordination or similar agreements relating thereto,
and (III) unrecorded easements, covenants, rights-of-way and other similar
restrictions, none of which items set forth in clauses (I), (II) and (III),
individually or in the aggregate, materially impair the continued use and
operation of the property to which they relate, as presently conducted. Except
as set forth on Schedule 6.17, to the knowledge of Buyer, the current use by
Buyer and its Subsidiaries of the plants, offices and other facilities located
on Buyer Property does not violate any local zoning or similar land use or
government regulations in any material respect. No condemnation of any material
portion of the Buyer Properties has occurred; and Buyer and its Subsidiaries
have not received any notice related to any future or proposed condemnation of
any material portion of the Buyer Properties.

         6.12.    Intellectual Property.
                  ---------------------

                  (a)   Schedule 6.12 sets forth a true and complete list of all
material Intellectual Property owned, used, filed by or licensed to Buyer or any
of its Subsidiaries. With respect to registered trademarks, Schedule 6.12 sets
forth a list of all jurisdictions in which such trademarks are registered or
applied for and all registrations and application numbers. Except as set forth
on 

                                      -34-
<PAGE>
 
Schedule 6.12, the Buyer and its Subsidiaries own, and Buyer and its
Subsidiaries have the right to use, execute, reproduce, display, perform,
modify, enhance, distribute, prepare derivative works of and sublicenses,
without payment to any other Person, all Intellectual Property listed in
Schedule 6.12 and, to the knowledge of Buyer or its Subsidiaries, the
consummation of the transactions contemplated hereby will not conflict with,
alter or impair any such rights. Buyer and its Subsidiaries have all rights to
Intellectual Property as are necessary in connection with their respective
businesses as they are presently being conducted.

                  (b)   Buyer and its Subsidiaries have not granted any licenses
or contractual rights of any kind relating to Intellectual Property listed on
Schedule 6.12 or the marketing or distribution thereof. Buyer and its
Subsidiaries are not bound by or a party to any Contracts of any kind relating
to the Intellectual Property of any other Person, except as set forth on
Schedule 6.12 and except for agreements relating to computer software licensed
to Buyer and its Subsidiaries in the ordinary course of business consistent with
past practice. Subject to the rights of third parties set forth on Schedule
6.12, all Intellectual Property listed in Schedule 6.12 is free and clear of the
claims of others and of all Liens whatsoever. The conduct of the businesses of
Buyer and its Subsidiaries as they are presently being conducted and as they are
proposed to be conducted after the Closing as contemplated by the parties does
not and will not violate, conflict with or infringe the Intellectual Property of
any other Person. Except as set forth on Schedule 6.12, (i) no claims are
pending or, to the knowledge of Buyer or any of its Subsidiaries, threatened
against Buyer or any of its Subsidiaries by any Person with respect to the
ownership, validity, enforceability, effectiveness or use of any Intellectual
Property and (ii) Buyer and its Subsidiaries have not received any
communications alleging that Buyer or any of its Subsidiaries has violated any
rights relating to Intellectual Property of any Person.

         6.13.    Employees.
                  ---------

                  (a)   Except as described on Schedule 6.13, Buyer and its
Subsidiaries have no contracts of employment with any employee and are not a
party to or subject to any collective bargaining agreements. Schedule 6.13
contains a true and complete list of all officers and key employees of Buyer and
each of its Subsidiaries as of July 1, 1997.

                  (b)   No employee of Buyer or any of its Subsidiaries shall be
entitled to receive any termination, severance or deferred compensation payment
as a result of the transactions contemplated by this Agreement.

                  (c)   Schedule 6.13 lists each Benefit Plan with respect to
which Buyer and its Subsidiaries contribute or have any liability (each a "Buyer
                                                                           -----
Benefit Plan"). Buyer has made available to the Crown Parties true and complete
- ------------
copies of any Buyer Benefit Plan and related trust agreements as in effect on
the date hereof and the most recent Form 5500 required to be filed with respect
to such Buyer Benefit Plan. No event has occurred since the filing of the most
recent Form 5500 that will materially increase the cost of any Buyer Benefit
Plan. No Buyer Benefit Plan is a "multiemployer plan" (within the meaning of
Section 3(37) of ERISA), and with respect to the operations of their businesses,
Buyer and its Subsidiaries are not required to contribute to, nor have Buyer and
its Subsidiaries maintained or contributed to or had an 

                                      -35-
<PAGE>
 
obligation to maintain or contribute to, any such plan within the five full plan
years of any such plan immediately prior to the date hereof.

                  (d)   Each of the Buyer Benefit Plans is in compliance in all
material respects with all applicable requirements of ERISA, the Code and other
applicable law. Each of the Buyer Benefit Plans has been administered in all
material respects in accordance with its terms. No Buyer Benefit Plan which is a
"defined benefit plan" (within the meaning of Section 3(35) of ERISA) has a
material amount of unfunded benefit liabilities (within the meaning of Section
4001(a)(18) of ERISA). No "reportable event" (as defined in Section 4043 of
ERISA), "prohibited transaction" (within the meaning of Section 406 of ERISA or
Section 4975 of the Code) or breach of fiduciary responsibility has occurred
with respect to any Buyer Benefit Plan which could subject the Crown Parties or
Buyer to a material penalty, tax or other liability under ERISA, the Code or
applicable law; there is no pending or, to the knowledge of Buyer, threatened
claim or litigation by any party with respect to the Buyer Benefit Plans, other
than routine claims for benefits. None of Buyer or its Subsidiaries nor any
entity required to be treated as a single employer under Section 414 of the Code
or Section 4001 of ERISA has a material, actual or contingent liability under
Title IV of ERISA and no condition exists that could reasonably be expected to
give rise to any such liability.

                  (e)   No Buyer Benefit Plan (i) has an "accumulated funding
deficiency" within the meaning of Section 412(a) of the Code as of its most
recent plan year of (ii) has applied for or received a waiver of the minimum
funding standards imposed by Section 412 of the Code; and Buyer and its
Subsidiaries have not incurred any material liability to a Buyer Benefit Plan
(other than for contributions not yet due) or to the Pension Benefit Guaranty
Corporation (other than for premiums not yet due).

                  (f)   No employee of Buyer or any of its Subsidiaries will be
entitled to any additional benefits or any acceleration of the time of payment
or vesting of any benefits under any Buyer Benefit Plan (other than under
written employment contracts listed on Schedule 6.13) as a result of the
transactions contemplated hereby. The deduction of any amount payable under any
Buyer Benefit Plan shall not be subject to disallowance under Section 280G of
the Code.

                  (g)   Each Buyer Benefit Plan may be amended or terminated
after the Effective Time without material liability to Buyer, Network or Mobile.

                  (h)   The consummation of the transactions contemplated by
this Agreement shall not give rise to any material liability with respect to any
Buyer Benefit Plan.

                  (i)   Each Buyer Benefit Plan intended to be a qualified plan
under Section 401(a) of the Code has been the subject of a determination letter
from the IRS to the effect that such Buyer Benefit Plan is qualified and exempt
from Federal income taxes under Sections 401(a) and 501(a), respectively, of the
Code, and no event has occurred that could adversely affect such qualified or
exempt status.

         6.14.    Litigation.   Schedule 6.14 sets forth a list of all pending
                  ----------
lawsuits or claims with respect to which Buyer or any of its Subsidiaries has
been contacted in writing by counsel for the 

                                      -36-
<PAGE>
 
plaintiff or claimant against or affecting Buyer or any Subsidiary or any of
their respective properties, assets, operations or businesses, and which (i)
relate to or involve more than $50,000, (ii) seek any material injunctive relief
or (iii) may give rise to any legal restraint on or prohibition against the
transactions contemplated by this Agreement. Except as set forth on Schedule
6.14, to the knowledge of Buyer or its Subsidiaries, none of the lawsuits or
claims listed in Schedule 6.14 as to which there is at least a reasonable
possibility of adverse determination would have, if so determined, individually
or in the aggregate, a Buyer Material Adverse Effect. Except as set forth on
Schedule 6.14, to the knowledge of Buyer and its Subsidiaries, there are no
unasserted or threatened claims of the type that would be required to be
disclosed in Schedule 6.14. To the knowledge of Buyer and its Subsidiaries,
except as set forth on Schedule 6.14, none of Buyer and its Subsidiaries is a
party or subject to or in default under any material judgment, order, injunction
or decree of any Governmental Entity or arbitration tribunal applicable to it or
its respective properties, assets, operations or businesses. Except as set forth
on Schedule 6.14, there is no lawsuit or claim by Buyer or any of its
Subsidiaries pending, or which Buyer or any of its Subsidiaries intend to
initiate, against any other Person. Except as set forth on Schedule 6.14, to the
knowledge of Buyer and its Subsidiaries, there is no pending or threatened
investigation of or affecting Buyer or any of its Subsidiaries by any
Governmental Entity.

         6.15.    Brokers.  There is no investment banker, broker or finder
                  -------
or other Person who will have any valid claim against Buyer, CAC I or CAC II for
a commission or brokerage in connection with this Agreement or the transactions
contemplated hereby as a result of any agreement of, or action taken by, Buyer,
other than Lehman Brothers whose fees will be paid by Buyer.

         6.16.    Contracts.  Except for Contracts listed on Schedule 6.16,
                  ---------
neither the Buyer nor any of its Subsidiaries is a party to or bound by any
Contract relating to or affecting the assets of Buyer and its Subsidiaries which
is a:

                  (a)   Contract with its agents, suppliers, customers,
advertisers, consultants, advisors, sales representatives, distributors, sales
agents or dealers other than Contracts which by their terms are cancelable by
Buyer or any of its Subsidiaries with notice of not more than 30 days and
without cancellation penalties or severance payments, in the case of any such
Contract, in excess of $50,000;

                  (b)   covenant not to compete (other than pursuant to any
radius restrictions contained in any lease, reciprocal easement agreement or
development, construction, operating or similar agreement) or confidentiality
agreement;

                  (c)   Contract with any Governmental Entity;

                  (d)   agreement, Contract or other instrument under which
Buyer or any of its Subsidiaries has borrowed any money from, or issued any
note, bond, debenture or other evidence of indebtedness to, any Person or any
other note, bond, debenture or other evidence of indebtedness issued to any
Person;

                                      -37-
<PAGE>
 
                  (e)   Contract (including any so-called take-or-pay, cash
deficiency or keepwell agreement) under which (A) any Person (including Buyer or
any of its Subsidiaries) has directly or indirectly guaranteed indebtedness,
liabilities or obligations of Buyer or any of its Subsidiaries or (B) or Buyer
or any of its Subsidiaries has directly or indirectly guaranteed indebtedness,
liabilities or obligations of any Person, and other than endorsements for the
purpose of collection in the ordinary course of business consistent with past
practice and including agreements having the effect of a guarantee, whether or
not required to be reflected on the Buyer Financial Statements in accordance
with GAAP;

                  (f)   pledge, security agreement, deed of Trust, financial
statement or other document granting a Lien on any of the assets of Buyer or any
of its Subsidiaries (other than Buyer Permitted Liens);

                  (g)   Contract under which Buyer or any of its Subsidiaries
has, directly or indirectly, made any advance, loan, extension of credit or
capital contribution to, or other investment in, any Person in excess of
$50,000;

                  (h)   Contract under which Buyer or any of its Subsidiaries is
lessee of, or holds or operates, any machinery, equipment, vehicle or other
tangible personal property owned by a third party and used in the business of
Buyer or any of its Subsidiaries and which entails payments in any 12-month
period, in the case of any such Contract, in excess of $50,000;

                  (i)   Contract or other arrangement with (A) any affiliate of
Buyer or any of its Subsidiaries or (B) any current or former officer, director
or employee, shareholder or with any Related Person of Buyer or any of its
Subsidiaries or any of their respective affiliates;

                  (j)   Contract for the sale of any of the assets of Buyer and
its Subsidiaries (including any capital stock or rights to acquire capital stock
of Buyer and its Subsidiaries) or the grant of any preferential rights to
purchase any of the assets of Buyer and its Subsidiaries or requiring the
consent of any party to the transfer thereof or otherwise limiting the ability
of Buyer and its Subsidiaries to sell the assets of Buyer and its Subsidiaries
(including any capital stock or rights to acquire capital stock of Buyer and its
Subsidiaries);

                  (k)   Contract not made in the ordinary course of business
consistent with past practice, including any joint venture or partnership
arrangement or any agreement relating to any merger or acquisition involving the
Buyer or any of its Subsidiaries; or

                  (l)   Contract whether or not made in the ordinary course of
business, which is material to Buyer and its Subsidiaries, taken as a whole, or
the termination of which could reasonably be expected to have a Buyer Material
Adverse Effect.

Buyer and its Subsidiaries are not, and to the best of the knowledge of Buyer
and its Subsidiaries, no other party is (with or without the lapse of time or
the giving of notice or both) in default in any material respect under any
Contract, License or instrument required to be set forth in Buyer's disclosure
schedules (each, a "Buyer Scheduled Contract"). Buyer and its Subsidiaries have
                    ------------------------    
made available to the Crown Parties or their Representatives true and complete
copies of all Buyer 

                                      -38-
<PAGE>
 
Scheduled Contracts. Each Buyer Scheduled Contract is in full force and effect
as of the date hereof and constitutes a legal, valid and binding obligation of
Buyer and its Subsidiaries and, to the best of the knowledge of Buyer and its
Subsidiaries, the other parties thereto, enforceable in accordance with its
terms. Neither Buyer nor any of its Subsidiaries has received any written notice
of the intention of any party to terminate any Buyer Scheduled Contract.

         6.17.    Compliance with Laws.  Except as set forth on Schedule 6.17,
                  --------------------
the operations of Buyer and its Subsidiaries are not now being conducted and, to
the knowledge of Buyer or any of its Subsidiaries, have not been conducted in
violation of any applicable law, ordinance, statute, rule or regulation of any
Governmental Entity except for violations, which do not and will not,
individually or in the aggregate, have or be reasonably expected to have a Buyer
Material Adverse Effect. Buyer and its Subsidiaries have not received any notice
from any Governmental Entity that the operations of Buyer and its Subsidiaries
are being conducted in violation of any applicable law, ordinance, statute, rule
or regulation of any Governmental Entity, or of any investigation or review
pending or threatened by any Governmental Entity investigating or reviewing any
alleged violation, which violation individually or in the aggregate with all
other violations would have or would reasonably be expected to have a Buyer
Material Adverse Effect. Except as set forth on Schedule 6.17 to this Agreement,
all the Real Property of Buyer and its Subsidiaries is in compliance with
applicable laws, including zoning, land use and building code laws, ordinances
and regulations necessary to conduct the operations of Buyer and its
Subsidiaries as presently conducted, and the transactions contemplated by this
Agreement could not reasonably be expected to result in the revocation of any
permit or variance, except to the extent that any such non-compliance, violation
or revocation, individually or in the aggregate, would not have or would not
reasonably be expected to have a Buyer Material Adverse Effect.

         6.18.    Environmental Matters.
                  ---------------------

                  (a)   Except as set forth on Schedule 6.18, Buyer and its
Subsidiaries are in compliance with all Environmental Laws, except for instances
of non-compliance, that, individually or in the aggregate, do not or will not
have or would not reasonably be expected to have a Buyer Material Adverse Effect
on the financial condition, business, operations or assets of Buyer and its
Subsidiaries. No Lien has attached to any Buyer Property or facility of Buyer
and its Subsidiaries pursuant to any Environmental Laws. Except as set forth on
Schedule 6.18, there have been no Releases of Hazardous Material by Buyer or any
of its Subsidiaries or, to the knowledge of Buyer or any of its Subsidiaries, by
any other Person in, on, under or affecting any Buyer Property or facility of
Buyer and its Subsidiaries, and Buyer and its Subsidiaries have not disposed of
any Hazardous Material in a manner that, in either case, individually or in the
aggregate, could reasonably be anticipated to result in a Buyer Material Adverse
Effect. Except as set forth on Schedule 6.18, prior to the period of ownership
or operation by Buyer and its Subsidiaries of any Buyer Property or facility, to
the knowledge of Buyer, no Hazardous Material was generated, treated, stored,
disposed of, used, handled or manufactured at, or transported, shipped or
disposed of from, such current or previously owned properties and, except as set
forth on Schedule 6.18, to the knowledge of Buyer, there were no Releases of
Hazardous Material in, on, under or affecting any such property. Except as set
forth on Schedule 6.18, there are no sites, locations or operations for which
Buyer and its Subsidiaries have received notice that they are or may be
responsible for any remedial or response action, as defined in any Environmental
Law,

                                      -39-
<PAGE>
 
relating to any Release of Hazardous Material. Schedule 6.18 sets forth a
list of any and all environmental audits of any Buyer Property or facility of
Buyer and its subsidiaries conducted by Buyer or by any of its Subsidiaries
during Buyer's or a Subsidiary's ownership of such Buyer Property or facility,
or obtained by, or performed on behalf of, Buyer and its Subsidiaries in
connection with its acquisition of any Buyer Property or facility, and any
audits in the possession of Buyer and its Subsidiaries of any Buyer Property or
facility adjacent to their facilities which relate to any facts, conditions or
circumstances that have resulted, or may result, in a Release of Hazardous
Material at or under such Buyer Property or facility (collectively, the "Buyer
                                                                         -----
Environmental Audits"). Buyer has made copies of all Buyer Environmental Audits
- --------------------
available to Sellers.

                  (b)   Buyer and its Subsidiaries have obtained, and are in
material compliance in all material respects with all Environmental Permits.
Except as disclosed on Schedule 6.18, Buyer and its Subsidiaries have not
received notice of any civil, criminal or administrative claims or proceedings,
pending or threatened, that are based on or related to any Environmental Laws or
the failure to comply with any terms and conditions of any Environmental Permits
which claims or proceedings of which failure to comply, individually or in the
aggregate, would have or reasonably be expected to result in a Buyer Material
Adverse Effect. To the knowledge of Buyer, except as described in Schedule 6.18,
(i) there are no PCBs in any container or equipment on, about, under or within
any Buyer Real Property or facility of Buyer and its Subsidiaries, (ii) there is
no asbestos at, on, about, under or within any Real Property or facility of
Buyer and its Subsidiaries and (iii) there are no underground storage tanks,
whether in service or closed in place, under any Buyer Property or facility of
Buyer or its Subsidiaries.

         6.19.    Taxes.
                  -----

                  (a)   Buyer and its Subsidiaries have timely filed or caused
to be timely filed, or will timely file or cause to be timely filed on or prior
to the Closing Date, all Tax returns and Tax reports which are required to be
filed (including proper filing extensions) on or prior to the Closing Date by
them. All such returns were or will be, as the case may be, complete and correct
in all material respects at the time of filing. All Taxes due and payable with
respect to taxable periods covered by such returns, or with respect to which any
of Buyer or its Subsidiaries is or might be otherwise liable (including Taxes
which Buyer and its Subsidiaries may have been required to withhold from amounts
owing to any stockholder, employee, creditor or third party), have been, or
prior to the Closing Date will be, timely paid. Except as disclosed in schedule
6.7, none of Buyer or any of its Subsidiaries is delinquent in the payment of
any Tax, or has any Tax deficiencies proposed, assessed, or to the knowledge of
Buyer, threatened against it. No Liens for Taxes exist with respect to any
assets of Buyer or its Subsidiaries.

                  (b)   Any deficiencies resulting from any tax audits or
examinations of Buyer or any of its Subsidiaries have been paid in full. There
are no present audits, disputes or proceedings as to any Taxes of Buyer or any
of its Subsidiaries. No material issues were raised in writing during any audit,
dispute or proceeding of Buyer or any of its Subsidiaries that might apply to
any taxable period subsequent to the taxable period covered by such audit,
dispute or proceeding.

                                      -40-
<PAGE>
 
                  (c)   None of Buyer or its Subsidiaries is a party to or bound
by any agreement (including any tax sharing agreement), election or extension of
the statute of limitations with respect to taxes. None of the Buyer or its
Subsidiaries is or has ever been a member of an affiliated, consolidated,
combined or unitary group of which any corporation other than Buyer or any of
its Subsidiaries also is or was a member.

                  (d)   Neither Buyer nor any of its Subsidiaries has taken any
action that would require it to include in income any adjustment under Section
481(a) of the Code by reason of a change in accounting method initiated by Buyer
or any of its Subsidiaries, and the Internal Revenue Service has not proposed
for any open Tax year any such adjustment or change in accounting method.
Neither Buyer nor any of its Subsidiaries will be required to include in a
taxable period (or portion thereof) beginning on or after the Closing Date
taxable income attributable to income that economically accrued in a prior
taxable period (or portion thereof), including as a result of the installment
method of accounting, the completed contract method of accounting or the cash
method of accounting.

         6.20.    Insurance.  Buyer and its Subsidiaries maintain policies
                  ---------
of fire and casualty, liability and other forms of insurance in such amounts,
with such deductibles and against such risks and losses as are customary in the
businesses in which they are engaged. The insurance policies owned and
maintained by Buyer and its Subsidiaries are listed in Schedule 6.20. All such
policies are in full force and effect, all premiums due and payable thereon have
been paid (other than retroactive or retrospective premium adjustments that are
not yet, but may be, required to be paid with respect to any period ending prior
to the Closing Date), and no notice of cancellation or termination has been
received with respect to any such policy which has not been replaced on
substantially similar terms prior to the date of such cancellation. The
activities and operations of Buyer and its Subsidiaries have been conducted in a
manner so as to conform in all material respects to all applicable provisions of
such insurance policies.


         6.21.    Disclosure.  No statement of Buyer contained in this 
                  ----------
Article 6, in Exhibit C, in any of the disclosure schedules referred to in
Article 6 or in any Certificates delivered pursuant to Section 4.3(f)
intentionally contains any untrue statement of a material fact or intentionally
omits to state a material fact necessary to make the statements contained herein
or therein, in light of the circumstances in which they are made not misleading.


                                   ARTICLE 7.

                              Covenants of Sellers
                              -------------------- 


         Each of the Crown Parties, on a joint and several basis that from the
date hereof until the completion of the Closing (or, in the case of Section 7.4,
until the third anniversary of the Closing Date), covenants and agrees as
follows:

         7.1.     Operation of the Business.   From the date hereof until the 
                  -------------------------         

Closing, except as expressly provided otherwise in this Agreement, the Crown
Parties shall conduct, or cause to be conducted, the Crown Communications
Business and the businesses of Network and Mobile in

                                      -41-
<PAGE>
 
the ordinary course consistent with past practice (including with respect to the
collection of receivables, payment of payables and other liabilities,
advertising activities, sales practices (including promotions, discounts and
concessions), capital expenditures and inventory levels, and contributions to or
accruals to or in respect of Benefit Plans). Furthermore, without limiting the
generality of the foregoing, until the Closing, the Crown Parties will (i) use
reasonable commercial efforts to (A) preserve intact their business
organizations and the business organization of the Crown Communications
Business, (B) keep available to Buyer and the Surviving Corporations the
services of the present officers and key employees of the Crown Communications
Business, Network and Mobile, (C) continue in full force and effect without
modification all existing policies or binders of insurance currently maintained
in respect of the Crown Communications Business, Network and Mobile, (D)
preserve their current material relationships with customers, suppliers,
creditors, employees, licensors, licensees, distributors and others with whom
any of the Crown Parties has a material business or financial relationship, (E)
safeguard the inventory of the Crown Communications Business, Network and Mobile
from theft or misappropriation, (F) maintain the books and records of the Crown
Communications Business, Network and Mobile in substantially the same manner as
presently maintained and (G) continue the construction and development of all in
progress construction and development sites, and (ii) not engage in any
practice, take any action, fail to take any action or enter into any transaction
that would or would reasonably be expected to result in any of the conditions
set forth in Article 11 not being satisfied on the Closing Date. In the event of
damage, destruction or loss affecting any assets of the Crown Communications
Business, Network or Mobile between the date hereof and the Closing Date, the
Crown Parties may (but shall not be obligated to) prior to the Closing Date
elect to repair (or undertake to repair) such damage, destruction or loss at the
expense of Sellers.

         In furtherance and not in limitation of the foregoing, each of the
Crown Parties covenants and agrees that, prior to the Closing, without the prior
written consent of Buyer, none of the Crown Parties will:

                  (a)   make any material change in the business policies or
practice of the Crown Communications Business (including any advertising,
marketing, pricing, purchasing, personnel or sales policy or practice) except in
the ordinary course of business consistent with past practice;

                  (b)   engage in any forward selling or acceleration of
customer orders or contracts, any deferral in paying payables, any deferral in
making capital expenditures or any delay in any construction or other capital
projects, any grant of any discount to customers other than in the ordinary
course of business consistent with past practice or any other changes intended
to increase the current income and cash collection of the Crown Communications
Business prior to the Closing Date by accelerating revenue that would otherwise
be collected after the Closing Date or deferring payment that would otherwise be
expected to be made prior to the Closing Date;

                  (c)   in the case of Network or Mobile, declare, set aside or
pay any dividend or other distribution with respect to any shares of capital
stock of Network or Mobile, or repurchase, redeem or otherwise acquire any
amount of outstanding shares of capital stock or other equity securities of, or
other ownership interests in, Network or Mobile;

                                      -42-
<PAGE>
 
                  (d)   issue, sell, transfer, pledge, or otherwise dispose of
or encumber any shares of, or securities convertible into or exchangeable for,
or options, warrants, calls, commitments or acquisition rights of any kind with
respect to any shares of, capital stock of any class or series of Network or
Mobile;

                  (e)   in the case of Network or Mobile, amend any term of any
outstanding security of Network or Mobile;

                  (f)   (x) incur or assume any indebtedness for borrowed money
other than under existing credit facilities in the ordinary course of business
consistent with past practice (but in any event not more than an aggregate
amount of additional indebtedness, to be agreed upon by Buyer and Sellers on or
prior to the Due Diligence Completion Date, in excess of the aggregate amounts
reflected on the Crown Interim Financial Statements), or (y) guarantee, endorse
or otherwise incur or assume (whether directly, contingently or otherwise)
liability for the obligations of any other Person, other than in the ordinary
course of business consistent with past practice;

                  (g)   create or assume any Lien on any material asset of the
Crown Communications Business, Network or Mobile other than Crown Permitted
Liens, Crown Permitted Real Estate Liens, and Liens incurred under existing
credit facilities or in the ordinary course of business consistent with past
practice;

                  (h)   make any loan, advance (other than to employees for
business expenses, consistent with past practice) or capital contribution to or
investment in any Person;

                  (i)   (x) enter into any Contract relating to any acquisition
or disposition of, or the lease, mortgage or pledge of, any assets or business
of any Person, except in the ordinary course of business consistent with past
practice or as required to comply with Section 7.1(o) hereof, or (y) agree to
any modification, amendment, assignment, termination or relinquishment of any
Contract, License or other right (including any insurance policy naming it as a
beneficiary or a loss payable payee) that would have or reasonably be expected
to have a Crown Material Adverse Effect, other than in the ordinary course of
business consistent with past practice and those contemplated by this Agreement;

                  (j)   change any method of accounting or accounting principles
or practice relating to the Crown Communications Business, Network or Mobile,
except for any such change required by reason of a change in GAAP;

                  (k)   make or change any Tax election, change any annual Tax
accounting period, adopt or change any method of Tax accounting, file any
amended return, enter into any closing agreement, settle any Tax claim or
assessment, surrender any right to claim a Tax refund, fail to make any Tax
payments or consent to extend or waive the limitations period applicable to any
Tax claim or assessment;

                  (l)   (w) grant any severance or termination pay to any
director, officer or employee of the Crown Communications Business, Network or
Mobile, (x) enter into any employment, deferred compensation or other similar
agreement (or any amendment to any such

                                      -43-
<PAGE>
 
existing agreement) with any director, officer or other employee of the Crown
Communications Business, Network or Mobile, (y) increase benefits payable under
any existing severance or termination pay policies or employment agreements, or
(z) increase compensation, bonuses or other benefits payable to directors,
officers or employees of the Crown Communications Business, Network or Mobile
except, with respect to clauses (w) or (z) pursuant to Crown Benefit Plans in
existence on the date hereof;

           (m)   adopt any changes to the articles of incorporation or by-laws
of Network or Mobile;

           (n)   adopt any plan or agreement of complete or partial liquidation,
dissolution, merger, consolidation, restructuring, recapitalization or other
material reorganization of the Crown Communications Business, Network or Mobile;

           (o)   fail to make any material capital expenditures necessary to
maintain the existing business of the Crown Communications Business, Network and
Mobile;

           (p)   enter into any Contract or transaction with any Affiliate or
Related Person of any of the Crown Parties;

           (q)   enter into or amend any Benefit Plan other than as required by
law; or

           (r)   agree in writing or otherwise to take any of the actions
specified in this Section 7.1.

     7.2.  Consents.  Without limiting the provisions of Section 9.3 hereof, the
           --------
Crown Parties shall use commercially reasonable efforts to obtain or cause to be
obtained prior to the Closing Date any necessary consents from any Person to the
assignment (directly or indirectly) to Buyer of any Contract, License or other
instrument and right of the Crown Parties included in the Acquired Business that
requires the consent of any third party by reason of the transactions provided
for in this Agreement, and Buyer will reasonably cooperate with the Crown
Parties in this regard, but neither the Crown Parties nor Buyer will be
obligated to make any special payment or grant any special concession to any
party. For the avoidance of doubt, the procurement of any such necessary
consents shall not be deemed to be a condition to Buyer's obligation to close
the transaction contemplated hereby.

     7.3.  Notice of Proceedings.  The Crown Parties will promptly notify Buyer
           ---------------------
telephonically and in writing upon the Crown Parties' (i) becoming aware of any
order or decree or any complaint praying for an order or decree restraining or
enjoining the consummation of this Agreement or the transactions contemplated
hereunder or (ii) receiving any notice from any Governmental Entity of its
intention (x) to institute an investigation into, or institute a suit or
proceeding to restrain or enjoin, the consummation of this Agreement or such
transactions or (y) to nullify or render ineffective this Agreement or such
transactions if consummated.

     7.4.  No Solicitation.  From the date of this Agreement through the Closing
           ---------------     
Date or the earlier termination of this Agreement in accordance with its terms,
none of the Crown Parties shall, nor shall any of the Crown Parties authorize or
permit any Representative of any of the

                                      -44-
<PAGE>
 
Crown Parties to, directly or indirectly solicit, initiate, encourage or
participate in any discussions or negotiations with, or furnish any information
or assistance to, or afford access to the properties, books and records or
employees of the Crown Communications Business, Network or Mobile to, any Person
or group (other than Buyer or its Representatives) concerning any merger, sale
of securities, sale of substantial assets or similar transaction involving any
of the Crown Parties. Without limiting the foregoing, it is understood that any
violation of the restrictions set forth in the preceding sentence by Sellers,
the Crown Communications Business, Network or Mobile, or any Representative of
Sellers, Network or Mobile, whether or not such Person is purporting to act on
behalf of any of Seller, the Crown Communications Business, Network or Mobile,
shall be deemed to be a breach of this Section 7.4 by Sellers.

     7.5.  Cooperation.  The Crown Parties acknowledge that Buyer intends to
           -----------
finance or refinance the acquisition of the Acquired Business by arranging for a
loan or loans from certain banks and by issuing securities in the high yield
debt market (collectively, the "Acquisition Financing"). In connection with the
                                ---------------------
Acquisition Financing, the Crown Parties shall cooperate with Buyer and aid
Buyer in consummating the Acquisition Financing, including by (a) using
commercially reasonable efforts to assist Buyer and its accountants in
obtaining, no later than July 28, 1997, audited and unaudited combined
historical financial statements for the Acquired Business meeting the
requirements of Regulation S-X for a Form S-1 registration statement with the
audited financial statements being audited by KPMG Peat Marwick LLP; (b)
executing and delivering to KPMG Peat Marwick LLP a customary letter of
representations to enable KPMG Peat Marwick LLP to deliver its audit opinion
with respect to the audited combined financial statements referred to in clause
(a) above; (c) assisting Buyer in the preparation of a customary offering
memorandum in connection with the issuance by Buyer of securities in the high
yield debt market; (d) providing access to Buyer's Representatives at reasonable
times to information and officers and other key employees of the Crown
Communications Business, Network or Mobile for due diligence purposes in
connection with the Acquisition Financing; and (e) providing access to Buyer's
Representatives at reasonable times to prior audits, working papers and other
information related to the financial statements of the Crown Communications
Business, Network and Mobile. For the avoidance of doubt, in no event shall
Buyer's obtaining or completing the audited financial statements or financing
referred to above be deemed to constitute a condition to Buyer's obligation to
close the transactions contemplated hereby. Any information obtained by Buyer
and its Representatives pursuant to this Section 7.5 relating to the operation
of the Acquired Business or the Crown Communications Business shall be held
confidential pursuant to the Confidentiality Agreement referred to in Section
14.14 hereof; provided, however, that Buyer and its Representatives may disclose
              --------  -------
such information as is reasonably necessary to complete the Acquisition
Financing (including as is reasonably necessary to meet their disclosure
obligations in connection with the Acquisition Financing).


                                  ARTICLE 8.

                              Covenants of Buyer
                              ------------------

     Buyer covenants and agrees that from the date hereof until the completion
of the Closing:

                                      -45-
<PAGE>
 
     8.1.  Operation of the Business. From the date hereof until the Closing,
           -------------------------
except as expressly provided otherwise in this Agreement, Buyer and its
Subsidiaries shall conduct, or cause to be conducted, their business in the
ordinary course consistent with past practice (including with respect to the
collection of receivables, payment of payables and other liabilities,
advertising activities, sales practices (including promotions, discounts and
concessions), capital expenditures and inventory levels, and contributions to or
accruals to or in respect of Benefit Plans). Furthermore, without limiting the
generality of the foregoing, Buyer and its Subsidiaries will (i) use reasonable
commercial efforts to (A) preserve intact their business organizations, (B) keep
available the services of their present officers and key employees, (C) continue
in full force and effect without modification all existing policies or binders
of insurance currently maintained in respect of their business, (D) preserve
their current material relationships with customers, suppliers, lenders,
creditors, employees, licensors, licensees, distributors and others with whom
Buyer or any of its Subsidiaries or CTSH or any of its Subsidiaries has a
material business or financial relationship, including without limitation the
BBC Agreement, (E) safeguard the inventory of Buyer and its Subsidiaries from
theft or misappropriation and (F) maintain the books and records of Buyer and
its Subsidiaries in substantially the same manner as presently maintained and
(ii) not engage in any practice, take any action, fail to take any action or
enter into any transaction that would or would reasonably be expected to result
in any of the conditions set forth in Article 10 not being satisfied on the
Closing Date.

     In furtherance and not in limitation of the foregoing, Buyer covenants and
agrees that, prior to the Closing, without the prior written consent of the
Crown Parties, none of Buyer or its Subsidiaries will:

           (a)   issue, sell, transfer, pledge or otherwise dispose of or
encumber any shares of, or securities convertible into or exchangeable for, or
options, warrants, calls, commitments or acquisition rights of any kind with
respect to any shares of, capital stock of any class or series of Buyer or its
Subsidiaries, other than issuances pursuant to the exercise of stock-based
awards or options, including under the plans described in Section 6.13,
outstanding on the date hereof and the issuance of convertible preferred stock
to investors in Buyer as contemplated in connection with transactions
contemplated hereby;

           (b)   declare, set aside or pay any dividend or other distribution
with respect to any shares of capital stock of Buyer or any of its Subsidiaries
or repurchase, redeem or otherwise acquire any amount of outstanding shares of
capital stock or other equity securities of, or other ownership interests in,
Buyer or any of its Subsidiaries, other than intercompany distributions and
advances between wholly owned Subsidiaries;

           (c)   enter into any Contract relating to any acquisition or
disposition, or the lease, mortgage or pledge of, of any assets or business of
any Person that would be reasonably likely to have a Buyer Material Adverse
Effect, other than in the ordinary course of business consistent with past
practice and those contemplated by this Agreement, or amend, modify, terminate
or violate any term of the BBC Agreement;

           (d)   change any method of accounting or accounting principles or
practice, except for any such change required by reason of a change in GAAP;

                                      -46-
<PAGE>
 
           (e)   adopt any changes to the certificate of incorporation or by-
laws of Buyer and similar governing instruments of its Subsidiaries;

           (f)   adopt any plan or agreement of complete or partial liquidation,
dissolution, merger, consolidation, restructuring, recapitalization or other
material reorganization of Buyer or any of its Subsidiaries; or

           (g)   agree in writing or otherwise to take any of the actions
specified in this Section 8.1.

     8.2.  Notice of Proceedings.  Buyer will promptly notify the Crown Parties
           ---------------------
telephonically and in writing upon Buyer (i) becoming aware of any order or
decree or any complaint praying for an order or decree restraining or enjoining
the consummation of this Agreement or the transactions contemplated hereunder or
(ii) receiving any notice from any Governmental Entity of its intention (x) to
institute an investigation into, or institute a suit or proceeding to restrain
or enjoin, the consummation of this Agreement or such transactions or (y) to
nullify or render ineffective this Agreement or such transactions if
consummated.

     8.3.  Corporate Name and Symbol.  On the Closing Date, Buyer will take all
           -------------------------
necessary action such that CAC III shall adopt the name "Crown Communication
Inc." or another name including "Crown" that is satisfactory to Sellers.
Commencing as of the Closing, Buyer and its Subsidiaries shall adopt and use the
current Crown Symbol, to the extent reasonably possible and permitted under
applicable law.

     8.4.  Liquidity Provision.  Buyer shall take appropriate steps to obtain
           -------------------
and maintain for one year following the Closing Date, not less than $30 million
in life insurance on the life of Robert A. Crown naming Barbara Crown as
beneficiary in order to provide liquid funds to pay taxes related to the capital
stock of Buyer owned by the Crowns resulting from the death of Robert A. Crown
or both the Sellers; provided, however, that the annual premium for any such
                     --------  -------
life insurance shall not exceed $45,000.

                                  ARTICLE 9.

                        Mutual Covenants of the Parties
                        -------------------------------

     Buyer and the Crown Parties covenant and agree from the date hereof until
the completion of the Closing:

     9.1.  Executive Compensation.  As soon as practicable after the Closing,
           ----------------------
Buyer shall adopt, for the benefit of Robert A. Crown and other key employees
named on Schedule 9.1, a mutually acceptable modern and meaningful compensation
package containing appropriate base salary, short-term incentives, long-term
incentives, pensions, group term life and medical insurance and other forms of
compensation comparable to those offered by other companies of comparable size
in the same or similar businesses. Prior to the Closing, Buyer shall provide to
Robert A. Crown a detailed summary of such proposed compensation package. In his
capacity as Chief Executive Officer, Robert A. Crown shall make the
recommendations to the compensation

                                      -47-
<PAGE>
 
committee or Board of Directors of Buyer, as applicable, regarding compensation
packages for the benefit of employees of Crown Communications Inc.

     9.2.  Hart-Scott-Rodino.  As soon as possible (but in no event later than
           -----------------
five business days) after the date hereof, the parties shall prepare and file
all documents with the Federal Trade Commission and the United States Department
of Justice as are required to comply with the Hart-Scott-Rodino Act, and shall
request early termination of the waiting period under the Hart-Scott-Rodino Act.
The parties will furnish promptly all materials thereafter requested by any
Governmental Entity having jurisdiction over such filings. The parties shall
keep each other fully informed of the status of the Hart-Scott-Rodino Act filing
and any other filings made to a Governmental Entity in connection with the
transactions contemplated in this Agreement.

     9.3.  Access to Facilities, Files and Records.  At the reasonable request
           ---------------------------------------
of any party hereto and upon reasonable advance notice, the other parties will
give or cause to be given to the authorized Representatives of such requesting
party (i) full access to all facilities, management personnel, property,
accounts, books, deeds, title papers, insurance policies, licenses, agreements,
contracts, commitments, logs, records and files of every character, equipment,
machinery, fixtures, furniture, vehicles and notes and accounts payable and
receivable and (ii) all such other information as such party may reasonably
request; provided, however, that parties shall not be required to permit such
access or provide such information to the extent it unreasonably interferes with
the operation of the party's business or such information is subject to a
binding confidentiality agreement with a third party.

     9.4.  Advice of Changes.  Each party will give written notice to the other
           -----------------
parties promptly upon its learning of (i) the occurrence of any event that would
or would be reasonably expected to cause or constitute a material breach had
such event occurred or been known to such party prior to the date hereof, of any
of such party's representations or warranties contained in this Agreement or in
any disclosure schedule to this Agreement, or of a Crown Material Adverse Effect
or a Buyer Material Adverse Effect, as the case may be, or (ii) any attempted
unionization of employees of such party.

     9.5.  Consummation of Agreement.  Subject to the provisions of Section 14.1
           -------------------------
of this Agreement, each of the parties hereto will use all reasonable efforts to
fulfill and perform all conditions and obligations required on its part to be
fulfilled and performed under this Agreement, and to cause the transactions
contemplated by this Agreement to be carried out.

     9.6.  No Solicitation of Employees.
           ----------------------------

           (a)   For a period of two years after the date of this Agreement or
until the earlier consummation of the Mergers, neither Buyer nor any of its
Subsidiaries will, nor will Buyer cause CTSH or any of its Subsidiaries to,
directly or indirectly, solicit or hire any employee of the Crown Communications
Business, Network or Mobile.

                                      -48-
<PAGE>
 
           (b)   For a period of two years after the date of this Agreement or
until the earlier consummation of the Mergers, none of the Crown Parties will,
directly or indirectly, solicit or hire any employee of the Buyer, CTSH or any
of their respective Subsidiaries.

     9.7.  Standstill.
           ----------

           (a)   Buyer acknowledges that Sellers have provided certain highly
sensitive and proprietary information to Buyer relating to, inter alia,
marketing plans, business strategies and methods of operations of the Crown
Parties, which, if used by Buyer in violation of the Confidentiality Agreement,
would be unfair and cause irreparable damage to the Crown Parties, for which
Crown's legal remedies would be inadequate. Accordingly, for a period of one
year from the date of this Agreement, neither Buyer nor any of its Subsidiaries
will, directly or indirectly, engage in, or provide any financial assistance to,
or make any investment in any business engaging in any wireless communications
site acquisition, ownership, design, development, construction, management and
servicing, including broadcast and telecommunications tower and rooftop
facilities ("Restricted Activities") conducted in any service area (or any
portion thereof) in Pennsylvania, West Virginia, Ohio or Kentucky served by the
Crown Parties as of the date hereof (the "Crown Territory"); provided, however,
that the prohibitions against Restricted Activities by Buyer set forth in this
Section 9.7(a) shall not apply to any Restricted Activities directly related to
or arising from existing contractual arrangements and certain contractual
negotiations between Buyer and NEXTEL with respect to Restricted Activities
within the Commonwealth of Kentucky, such contractual arrangements and
negotiations having been entered into prior to the date of this Agreement.

           (b)   Sellers acknowledge that Buyer has provided certain highly
sensitive and proprietary information to Seller relating to, inter alia,
marketing plans, business strategies and methods of operations of the Buyer and
its Subsidiaries, which, if used by Buyer in violation of the Confidentiality
Agreement, would be unfair and cause irreparable damage to the Buyer, for which
Buyer's legal remedies would be inadequate. Accordingly, for a period of one
year from the date of this Agreement, none of the Crown Parties will, directly
or indirectly, engage in, or provide any financial assistance to, or make any
investment in any business engaging in the any Restricted Activities conducted
in any service area (or any portion thereof) in Arizona, Colorado, Mississippi,
Nevada, New Mexico, North Dakota, Oklahoma, Puerto Rico or Texas served by the
Buyer or its Subsidiaries as of the date hereof.

     Notwithstanding the foregoing, Buyer or any of its Subsidiaries may (i)
acquire stock or assets of a business ("New Business") that is engaged in
Restricted Activities in the Crown Territory, provided that the Restricted
Activities conducted by such New Business in the Crown Territory account for
less than 10% of the annual gross revenues of the New Business and less than 10%
of the total asset value of such New Business, and provided further, that in
each such case the Buyer or its Subsidiaries, or such New Business shall, within
one (1) month of such acquisition, offer to sell to Sellers the portion of such
New Business conducted in the Crown Territory upon the same price and other
terms paid by Buyer for such portion of the New Business. In the event that
Buyer is unable to allocate the consideration paid for the New 

                                      -49-
<PAGE>
 
Business to that portion thereof conducted in the Crown Territory, then Buyer
and Sellers shall use commercially reasonable efforts to agree upon an
acceptable price therefor.

                                  ARTICLE 10.

              Conditions to the Obligations of the Crown Parties
              --------------------------------------------------

     The obligations of the Crown Parties to consummate the transactions
contemplated by this Agreement are subject to the satisfaction (or waiver by the
Crown Parties) of the following conditions:

     10.1. No Buyer Material Adverse Effect; Representations and Warranties
           ----------------------------------------------------------------
and Covenants.
- -------------

           (a)   No event or events shall have occurred since the date of this
Agreement which, individually or in the aggregate, has had or is reasonably
likely to result in a Buyer Material Adverse Effect.

           (b)   Each of Buyer, CAC I and CAC II shall have performed in all
material respects all of its obligations and complied in all material respects
with all of its covenants hereunder required to be performed or complied with by
it at or prior to the Closing and the representations and warranties of each of
Buyer, CAC I and CAC II contained in this Agreement qualified as to materiality
shall be true and correct, and those not so qualified shall be true and correct
in all material respects, as of the Closing Date, as if made at and as of such
date, except for those representations and warranties that address matters only
as of a particular date (in which case such representations and warranties
qualified as to materiality shall be true and correct, and those not so
qualified shall be true and correct in all material respects, on and as of such
date).

     10.2. Proceedings.  Neither the Crown Parties nor Buyer, CAC I or CAC II
           -----------
shall (a) be subject to any restraining order or injunction restraining or
prohibiting the consummation of the transactions contemplated hereby and (b)
have received written notice from any Governmental Entity of its intention to
institute any action or proceeding seeking to restrain, enjoin or nullify this
Agreement or the transactions contemplated hereby.

     10.3. Hart-Scott-Rodino.  The applicable waiting period imposed by the 
           -----------------
Hart-Scott-Rodino Act shall have expired or been terminated.

     10.4. Deliveries.  Buyer shall have complied with each and every one of its
           ----------
obligations set forth in Section 4.3.

     10.5. Liquidity Provision.  Buyer shall have obtained life insurance for
           -------------------
Robert A. Crown as provided in Section 8.4.

                                      -50-
<PAGE>
 
                                  ARTICLE 11.

           Conditions to the Obligations of Buyer, CAC I and CAC II
           --------------------------------------------------------

     The obligations of Buyer, CAC I and CAC II to consummate the transactions
contemplated by this Agreement are subject to the satisfaction (or waiver by
such parties) of the following conditions:

     11.1. No Crown Material Adverse Effect; Representations, Warranties and
           -----------------------------------------------------------------
Covenants.
- ---------

           (a)   No event or events shall have occurred since the date of this
Agreement which, individually or in the aggregate, has had or is reasonably
likely to result in a Crown Material Adverse Effect.

           (b)   Each of the Crown Parties shall have performed in all material
respects all of its obligations and complied in all material respects with all
of its covenants hereunder required to be performed or complied with by it at or
prior to the Closing and the representations and warranties of each of the Crown
Parties contained in this Agreement qualified as to materiality shall be true
and correct, and those not so qualified shall be true and correct in all
material respects, as of the Closing Date, as if made at and as of such date,
except for those representations and warranties that address matters only as of
a particular date (in which case such representations and warranties qualified
as to materiality shall be true and correct, and those not so qualified shall be
true and correct in all material respects, on and as of such date).

     11.2. Proceedings.  Neither the Crown Parties nor Buyer, CAC I or CAC II
           -----------
shall (a) be subject to any restraining order or injunction restraining or
prohibiting the consummation of the transactions contemplated hereby and (b)
have received written notice from any Governmental Entity of its intention to
institute any action or proceeding seeking to restrain, enjoin or nullify this
Agreement or the transactions contemplated hereby.

     11.3. Hart-Scott-Rodino.  The applicable waiting period imposed by the 
           -----------------
Hart-Scott-Rodino Act relating to the transactions contemplated by this
Agreement shall have expired or been terminated. The applicable waiting period
imposed by the Hart-Scott-Rodino Act relating to the investment by certain of
the Investors (as defined in the Shareholder Agreement) in Buyer in shares of
convertible preferred stock in connection with the transactions contemplated by
this Agreement shall have been expired or been terminated.

     11.4. Deliveries.  Each of the Crown Parties shall have complied with each
           ----------
and every one of its obligations set forth in Section 4.2.

     11.5. Robert A. Crown.  Robert A. Crown shall be alive and shall have the
           ---------------
mental and physical capacity to operate the Acquired Business as such business
is operated by him as of the date of this Agreement.

                                      -51-
<PAGE>
 
                                  ARTICLE 12.

                  Survival of Representations and Warranties
                  ------------------------------------------

     12.1. Survival.  All representations and warranties contained in this
           --------
Agreement or in any Schedule, Exhibit, certificate, agreement, document or
statement delivered pursuant hereto shall terminate on and as of the Closing.

     12.2. Indemnification.  From and after the Closing, the parties shall
           ---------------
indemnify each other as set forth below.

           (a)   Indemnification by Sellers. Sellers jointly and severally shall
                 --------------------------
indemnify Buyer, the Crown Communications Business, CAC I, CAC II, Network and
Mobile and each of their respective Affiliates and each of their respective
Representatives against and hold them harmless from any loss, liability, claim,
damage or expense (including reasonable legal fees and expenses) (collectively,
the "Buyer's Damages") suffered or incurred by any such indemnified party (other
     ---------------
than any relating to Taxes, for which indemnification provisions are set forth
in Section 13.4) arising from, relating to or otherwise in respect of (i) any
breach of any pre-closing covenant of Sellers contained in this Agreement, (ii)
all Excluded Liabilities and (iii) all obligations and liabilities of Network
and Mobile of any kind whatsoever, whether accrued, contingent, absolute,
determined, determinable or otherwise, other than any such liabilities or
obligations disclosed in Section 5.10 (b); provided, however, that Sellers shall
                                           --------  -------
not have any liability under clause (i) above unless the Buyer's Damages shall
have resulted from an intentional breach or fraud on the part of any of the
Crown Parties.

           Each of Buyer, CAC I, CAC II, Network and Mobile acknowledges and
agrees that, should the Closing occur, its sole and exclusive remedy with
respect to any and all claims relating to this Agreement and the transactions
contemplated hereby (other than matters related to the Shareholder Agreement and
other than post-Closing covenants) and the Crown Communications Business (other
than claims of, or causes of action arising from, fraud) shall be pursuant to
the indemnification provisions set forth in this Article 12. In furtherance of
the foregoing, each of Buyer, CAC I, CAC II, Network and Mobile hereby waives,
from and after the Closing, any and all rights, claims and causes of action
(other than claims of, or causes of action arising from, fraud) it may have
against Sellers and their respective Affiliates arising under or based upon any
federal, state, local or foreign statute, law, ordinance, rule or regulation or
otherwise (except pursuant to the indemnification provisions set forth in this
Article 12).

           (b)   Indemnification by Buyer. Buyer shall, and shall cause its
Subsidiaries to, indemnify Sellers and their respective Affiliates and each of
their respective Representatives against and hold them harmless from any loss,
liability, claim, damage or expense (including reasonable legal fees and
expenses) (collectively, "Sellers' Damages") incurred by any such indemnified
                          ----------------
party, arising from, relating to or otherwise in respect of (i) any breach of
any pre-closing covenant of Buyer contained in this Agreement and (ii) all
Assumed Liabilities; provided that Buyer shall not have any liability under
clause (i) above unless the Sellers' Damages shall have resulted from an
intentional breach or fraud on the part of Buyer.

                                      -52-
<PAGE>
 
           Each of the Sellers acknowledges and agrees that, should the Closing
occur, his or her sole and exclusive remedy with respect to any and all claims
relating to this Agreement and the transactions contemplated hereby (other than
the matters related to the Shareholder Agreement and other than post-closing
covenants, or claims of, or causes of action arising from, fraud) shall be
pursuant to the indemnification provisions set forth in this Article 12. In
furtherance of the foregoing, each of the Sellers hereby waives from and after
the Closing, any and all rights, claims and causes of action (other than claims
of, or causes of action arising from, fraud) he or she may have against Buyer
and its Affiliates arising under or based upon any federal, state, local or
foreign statute, law, ordinance, rule or regulation or otherwise (except
pursuant to the indemnification provisions set forth in this Article 12).

           (c)   Losses Net of Insurance, etc.  The amount of any loss,
                 ----------------------------
liability, claim, damage, expense or Tax for which indemnification is provided
under this Article 12 or Article 13 shall be net of any amounts recovered by the
indemnified party under insurance policies with respect to such loss, liability,
claim, damage, expense or Tax (collectively, a "Loss") and shall be (i)
increased to take account of any net Tax cost incurred by the indemnified party
arising from the receipt or accrual of indemnity payments hereunder (grossed up
for such increase) and (ii) reduced to take account of any net Tax benefit
realized by the indemnified party arising from the deductibility of any such
Loss. In computing the amount of any such Tax cost or Tax benefit, the
indemnified party shall be deemed to recognize all other items of income, gain,
loss, deduction or credit before recognizing any item arising from the receipt
or accrual of any indemnity payment hereunder or the deductibility of any
indemnified Loss. Any indemnification payment hereunder shall initially be made
without regard to this paragraph and shall be increased or reduced to reflect
any such net Tax cost (including gross-up) or net Tax benefit only after the
indemnified party has actually realized such cost or benefit. For purposes of
this Agreement, an indemnified party shall be deemed to have "actually realized"
a net Tax cost or a net Tax benefit to the extent that, and at such time as, the
amount of Taxes payable by such indemnified party is increased above or reduced
below, as the case may be, the amount of Taxes that such indemnified party would
be required to pay but for the receipt or accrual of the indemnity payment or
the deductibility of such Loss, as the case may be. The amount of any increase
or reduction hereunder shall be adjusted to reflect any final determination
(which shall include the execution of Form 870-AD or successor form) with
respect to the indemnified party's liability for Taxes and payments between
Sellers and Buyer to reflect such adjustment shall be made if necessary. Any
indemnity payment under this Agreement shall be treated as an adjustment to the
Purchase Price for Tax purposes, unless a final determination (which shall
include the execution of a Form 870-AD or successor form) with respect to the
indemnified party or any of its affiliates causes any such payment not to be
treated as an adjustment to the Purchase Price for federal income Tax purposes.

           (d)   Termination of Indemnification.  The obligations to indemnify
                 ------------------------------
and hold harmless a party hereto pursuant to Sections 12.2(a) and 12.2(b) shall
not terminate.

           (e)   Procedures Relating to Indemnification under Article 12.  In
                 -------------------------------------------------------
order for a party (the "indemnified party") to be entitled to any
indemnification provided for under this Agreement (other than under Article 13)
in respect of, arising out of or involving a claim or demand made by any Person
against the indemnified party (a "Third Party Claim"), such indemnified party
                                  -----------------
must notify the indemnifying party in writing, and in reasonable detail, of the

                                      -53-
<PAGE>
 
Third Party Claim within 10 business days after receipt by such indemnified
party of written notice of the Third Party Claim; provided, however, that
                                                  --------  -------
failure to give such notification shall not affect the indemnification provided
hereunder except to the extent the indemnifying party shall have been actually
prejudiced as a result of such failure (except that the indemnifying party shall
not be liable for any expenses incurred during the period in which the
indemnified party failed to give such notice). Thereafter, the indemnified party
shall deliver to the indemnifying party, within five business days after the
indemnified party's receipt thereof, copies of all notices and documents
(including court papers) received by the indemnified party relating to the Third
Party Claim.

           If a Third Party Claim is made against an indemnified party, the
indemnifying party shall be entitled to participate in the defense thereof and,
if it so chooses and acknowledges its obligation to indemnify the indemnified
party therefor, to assume the defense thereof with counsel selected by the
indemnifying party; provided that such counsel is not reasonably objected to by
                    --------
the indemnified party. Should the indemnifying party so elect to assume the
defense of a Third Party Claim, the indemnifying party shall not be liable to
the indemnified party for legal expenses subsequently incurred by the
indemnified party in connection with the defense thereof. If the indemnifying
party assumes such defense, the indemnified party shall have the right to
participate in the defense thereof and to employ counsel (not reasonably
objected to by the indemnifying party), at its own expense, separate from the
counsel employed by the indemnifying party, it being understood that the
indemnifying party shall control such defense. The indemnifying party shall be
liable for the fees and expenses of counsel employed by the indemnified party
for any period during which the indemnifying party has failed to assume the
defense thereof (other than during the period prior to the time the indemnified
party shall have given notice of the Third Party Claim as provided above).

           If the indemnifying party so elects to assume the defense of any
Third Party Claim, all of the indemnified parties shall cooperate with the
indemnifying party in the defense or prosecution thereof. Such cooperation shall
include the retention and (upon the indemnifying party's request) the provision
to the indemnifying party of records and information which are reasonably
relevant to such Third Party Claim, and making employees available on a mutually
convenient basis to provide additional information and explanation of any
material provided hereunder. Whether or not the indemnifying party shall have
assumed the defense of a Third Party Claim, the indemnified party shall not
admit any liability with respect to, or settle, compromise or discharge, such
Third Party Claim without the indemnified party's prior written consent (which
consent shall not be unreasonably withheld). If the indemnifying party shall
have assumed the defense of a Third Party Claim, the indemnified party shall
agree to any settlement, compromise or discharge of Third Party Claim which the
indemnifying party may recommend and which by its terms obligates the
indemnifying party to pay the full amount of the liability in connection with
such Third Party Claim, which releases the indemnifying party completely in
connection with such Third Party Claim and which would not otherwise adversely
affect the indemnified party.

           Notwithstanding the foregoing, the indemnifying party shall not be
entitled to assume the defense of any Third Party Claim (and shall be liable for
the reasonable fees and expenses of counsel incurred by the indemnified party in
defending such Third Party Claim) if the Third Party Claim seeks an order,
injunction or other equitable relief or relief for other than 

                                      -54-
<PAGE>
 
money damages against the indemnified party which the indemnified party
reasonably determines, after conferring with its outside counsel, cannot be
separated from any related claim for money damages. If such equitable relief or
other relief portion of the Third Party Claim can be so separated from that for
money damages, the indemnifying party shall be entitled to assume the defense of
the portion relating to money damages. The indemnification required by Section
12.2(a) or 12.2(b) other than Third Party Claims shall be governed by Section
12.2(e). All Tax Controversies as defined in Section 13.3 shall be governed by
Section 13.3.

           (f)   Other Claims. In the event any indemnified party should have a
                 ------------
claim against any indemnifying party under Section 12.2(a) or 12.2(b) that does
not involve a Third Party Claim being asserted against or sought to be collected
from such indemnified party, the indemnified party shall deliver notice of such
claim with reasonable promptness to the indemnifying party. The failure by any
indemnified party so to notify the indemnifying party shall not relieve the
indemnifying party from any liability which it may have to such indemnified
party under Section 12.2(a) or 12.2(b), except to the extent that the
indemnifying party demonstrates that it has been materially prejudiced by such
failure. If the indemnifying party does not notify the indemnified party within
10 business days following its receipt of such notice that the indemnifying
party disputes its liability to the indemnified party under Section 12.2(a) or
12.2(b), such claim specified by the indemnified party in such notice shall be
conclusively deemed a liability of the indemnifying party under Section 12.2(a)
or 12.2(b) and the indemnifying party shall pay the amount of such liability to
the indemnified party on demand or, in the case of any notice in which the
amount of the claim (or any portion thereof) is estimated, on such later date
when the amount of such claim (or such portion thereof) becomes finally
determined. If the indemnifying party has timely disputed its liability with
respect to such claim, as provided above, the indemnifying party and the
indemnified party shall proceed in good faith to negotiate a resolution of such
dispute, and, if not resolved through negotiations, such dispute shall be
resolved by litigation in an appropriate court of competent jurisdiction.

           (g)   Mitigation.  Buyer and Sellers shall cooperate with each other
                 ----------
with respect to resolving any claim or liability with respect to which one party
is obligated to indemnify the other party hereunder, including by making
commercially reasonable efforts to mitigate or resolve any such claim or
liability; provided that such party shall not be required to make such efforts
           --------
if they would be detrimental in any material respect to such party. In the event
that Buyer or Sellers shall fail to make such commercially reasonably efforts to
mitigate or resolve any claim or liability, then (unless the proviso to the
foregoing covenant shall be applicable) notwithstanding anything else to the
contrary contained herein, the other party shall not be required to indemnify
any Person for any loss, liability, claim, damage or expense that could
reasonably be expected to have been avoided if Buyer or Sellers, as the case may
be, had made such efforts.

                                  ARTICLE 13

                              Tax-Related Matters
                              -------------------

     13.1. Closing of Tax Year. The Crown Parties and Buyer hereby acknowledge
           -------------------
that, effective as of the Closing Date, each of Network and Mobile will cease to
be an S corporation 

                                      -55-
<PAGE>
 
under the Code. As a result, each of Network's and Mobile's taxable years as an
S corporation will terminate as of the Closing Date, and such corporations will
be required to file Federal income tax returns and various state income and
franchise tax returns for the period beginning January 1, 1997 and ending on the
earlier to occur of December 31, 1997 and the date prior to the Closing Date,
and, if the Closing does not occur prior to December 31, 1997, the period
commencing January 1, 1998 and ending on the date prior to the Closing Date (the
"Final S Tax Period(s)"). Each of the Crown Parties and Buyer hereby agree that
 ---------------------
Network and Mobile each shall be treated as an S corporation for Federal income
tax purposes, and by all states and localities listed on Schedule 5.23(c), for
the Final S Tax Period(s).

     13.2  Filing of Tax Returns.
           ---------------------

           (a)   The Crown Parties shall, at their sole expense, cause Habib &
Associates to prepare all Tax returns required to be filed by Network and/or
Mobile or with respect to the Crown Communications Business for any taxable
period which ends prior to the Closing Date or on the Closing Date, including
the Federal income tax return(s) for the Final S Tax Period(s), and the various
state income tax and franchise returns for the same period(s) (each, a "Pre-
                                                                        ----
Closing Tax Return"); provided, however, that (i) such returns shall be prepared
- ------------------    --------  -------
on a basis consistent with the intention of the parties that each of the Mergers
will qualify as a "reorganization" within the meaning of Section 368(a) of the
Code (to the extent such position is consistent with applicable law) and that
the purchase of the Crown Communications Business will be a taxable transaction,
(ii) such returns shall be prepared on a basis consistent with past practice and
in a manner that does not distort taxable income (e.g., by deferring income to a
                                                  ----
period after the Closing or accelerating deductions to a period prior to the
Closing) and (iii) such returns shall be submitted to Buyer no less than two
weeks prior to the due date for filing and shall not be filed without the prior
written consent of Buyer. The parties shall use reasonable commercial efforts to
promptly resolve any disagreements as to the Pre-Closing Tax return(s). Any
remaining disagreements will be referred to a "Big 6" accounting firm, mutually
agreed upon by Buyer and Sellers, for resolution, provided that the scope of
                                                  --------
review by such accounting firm shall be limited to the disputed items.

           (b)   All returns with respect to Taxes for a Tax Indemnification
Period (as defined in Section 13.4), other than Pre-Closing Tax Returns, shall
be prepared by Buyer in a manner consistent with that set forth in Section
13.2(a).

           (c)   The Crowns shall pay to Buyer, Network or Mobile, as Buyer may
direct, all amounts due with respect to Pre-Closing Tax Returns or any other
return for the Tax Indemnification Period no later than two days prior to the
due date for payment with respect thereto.

           (d)   Any tax refunds of Taxes of Network, Mobile or the Crown
Communications Business attributable to the Tax Indemnification Period shall be
for the account of the Crowns. Any other tax refunds shall be for the account of
Buyer.

     13.3. Tax Audits, Etc.  The Crowns and Buyer shall promptly notify each
           ---------------
other in writing within 10 days from receipt by any of them (or Network or
Mobile, in the case of Buyer) 

                                      -56-
<PAGE>
 
of notice of any pending or threatened Tax audit, determination or assessment of
Network, Mobile or the Crown Communications Business for any Tax Indemnification
Period (a "Tax Controversy"); provided, however, that the failure of one party
           ---------------    --------  -------
to so notify the other party of any Tax Controversy shall not affect such other
party's obligations hereunder except to the extent such other party is actually
prejudiced by such failure. Except as otherwise provided in this Section 13.3,
the Crowns shall have the right to control, at their own expense, all phases of
any Tax Controversy relating to a Pre-Closing Tax Return. In connection with any
such Tax Controversy, the Crowns shall have the right to employ third-party
advisors, including accountants and attorneys, all at their own expense;
provided, however, that no such third-party advisors shall be retained without
- --------  -------
the prior consent of Buyer. The Crowns shall regularly consult with Buyer in
connection with any such Tax Controversy and shall provide reports (including
copies of any and all correspondence received by the Crowns from taxing
authorities) to Buyer no less frequently than monthly to apprise it of the
status thereof. Buyer shall have the right to participate, at its own expense,
in any and all proceedings with respect to any such Tax Controversy.
Notwithstanding the foregoing, the Crowns shall have no right, without the prior
written consent of Buyer, to (A) enter into any settlement agreement, closing
agreement or other agreement in compromise with any taxing authority in
connection with a Tax Controversy, (B) file a petition in any court in
connection with a Tax Controversy (whether in the form of a claim for refund, a
challenge of an asserted deficiency or otherwise) or appeal or file to appeal
any decision of any court in connection with a Tax Controversy or (C) permit the
expiration of any period of time during which administrative or judicial relief
may be sought with respect to a Tax Controversy. Buyer shall have the right to
control, at its own expense, all phases of any Tax Controversy other than a Tax
Controversy relating to a Pre-Closing Tax Return. The Crowns shall have the same
right to participate in any such Tax Controversy as Buyer would have in a Tax
Controversy relating to a Pre-Closing Tax Return.

     13.4. Tax Indemnification.  The Crowns jointly and severally shall
           -------------------
indemnify and hold harmless Buyer, CAC I, CAC II, Network and Mobile and their
respective affiliates from (i) all liability for Taxes of Network, Mobile or the
Crown Communications Business for all taxable period ending on or before the
Closing Date and the portion of any taxable period ending on the Closing Date
where the taxable period includes (but does not end on) the Closing Date (the
"Tax Indemnification Period"), (ii) (A) all liability (as a result of Treasury
 --------------------------
Regulation (S) 1.1502-6(a) or otherwise) for Taxes of any person other than
Network or Mobile which is or has ever been affiliated with Network or Mobile or
with whom Network or Mobile has ever joined (or has ever been required to join)
in filing any consolidated, combined, unitary or aggregate return, or with
respect to which Network, Mobile or the Crown Communications Business is a
transferee or a successor, (iii) any loss, liability, claim, damage or expense
attributable to any breach of any warranty or representation contained in
Section 5.23 (relating to Taxes), or any breach by the Crown Parties of any
covenant contained in this Article 13 (relating to Taxes), (iv) all liability
for Taxes arising (directly or indirectly) as a result of or otherwise
attributable to the sale of the Crown Communications Business, the Mergers or
otherwise in connection with this Agreement or the transactions contemplated
hereby, other than any transfer taxes to the extent assumed by Buyer pursuant to
Section 13.5, and (v) all liability for reasonable legal, accounting, appraisal,
consulting or similar fees and expenses attributable to any item in clauses (i)
through (iv) above.

                                      -57-
<PAGE>
 
     In the case of any taxable period that includes (but does not end on) the
Closing Date (a "Straddle Period"):
                 ---------------

           (i)   real, personal and intangible property Taxes ("Property Taxes")
                                                                --------------
of Network, Mobile or the Crown Communications Business for the Straddle Period
shall be equal to the amount of such property Taxes for the entire Straddle
Period multiplied by a fraction, the numerator of which is the number of days
during the Straddle Period that are in the Pre-Closing Tax Period and the
denominator of which is the number of days in the entire Straddle Period; and

           (ii)  the Taxes of Network, Mobile or the Crown Communications
Business (other than property Taxes) for the Pre-Closing Tax Period shall be
computed as if such taxable period ended as of the close of business on the
Closing Date.

     13.5. Transfer Taxes, Etc.  All transfer, documentary, sales, use,
           -------------------
registration and other such Taxes (including all applicable real estate transfer
or gains Taxes and stock transfer and sales Taxes) and the related fees
(including any penalties, interests and additions to Tax) incurred in connection
with the sale of the Crown Communications Business, the Mergers or otherwise in
connection with this Agreement or the transactions contemplated hereby shall be
paid by Buyer, and the Crowns and Buyer shall cooperate in timely preparing and
filing all Returns as may be required to comply with the provisions of such Tax
laws. The Crowns shall cooperate with Buyer to minimize, to the extent permitted
by law, the amount of any sales taxes, transfer taxes or similar taxes and fees
imposed with respect to the transactions contemplated by this Agreement,
including by utilizing any applicable sales tax exemptions for occasional sales.

     13.6. Tax Certificate.  The Crowns shall deliver to Buyer at the Closing a
           ---------------
duly executed and acknowledged certificate, in form and substance acceptable to
Buyer and in compliance with the Code and Treasury Regulations, certifying such
facts as to establish that the sale of the Crown Communications Business, the
Mergers and any other transactions contemplated hereby are each exempt from
withholding under Section 1445 of the Code.

     13.7. Tax Agreements.  The Crown Parties shall cause the provisions of any
           --------------
agreement, arrangement or practice with respect to Taxes (including any Tax
sharing agreements) between the Crowns and their affiliates other than Network
and Mobile, on the one hand, and Network, Mobile and the Crown Communications
Business on the other hand, to be terminated on or before the Closing Date.
After the Closing Date, no Person shall have any rights or obligations under any
such agreement, arrangement or practice with respect to Taxes.

     13.8. Access to Books and Records.  After the Closing Date, each party
           ---------------------------
shall, upon the request of the other party, in connection with the preparation
by either party of Tax returns or Tax contests and for such other purposes as
either party shall reasonably request: (i) provide to the officers and other
authorized Representatives of the requesting party full access, during normal
business hours upon reasonable advance notice, to any and all premises,
properties, files, books, records, documents and other information of Network,
Mobile or the Crown Communications Business, (ii) cause its officers to (and in
the case of Crowns, the Crowns will) furnish to the requesting party and its
authorized Representatives any and all relevant financial, technical and
operating data and other information pertaining to Network, Mobile or the Crown

                                      -58-
<PAGE>
 
Communications Business, (iii) make available to the requesting party and its
authorized Representatives personnel to consult with such Persons and (iv) make
available for inspection and copying by the requesting party at such party's
expense true and complete copies of any documents relating to the foregoing. Any
information obtained by either party pursuant to this Section 13.8 relating to
the operation of Network, Mobile or the Crown Communications Business after (in
the case of the Crowns) or prior to (in the case of Buyer) the Closing shall be
held confidential by the requesting party to the same extent as the requesting
party is required to keep information confidential pursuant to the
Confidentiality Agreement referred to in Section 14.14 hereof. In exercising
their rights under the foregoing provisions of this Section 13.8, the requesting
party and its Representatives shall not interfere with the other party's normal
operations.

    13.9.  Allocation of Crown Value.  The value of the Crown Communications
           -------------------------
Business and the Assumed Liabilities and the Network and Mobile Common Stock
shall be mutually agreed to by Buyer and the Crowns. Buyer shall provide a draft
schedule of such allocations to the Crowns no later than the earlier of 30 days
from the date hereof and 10 days prior to the Closing Date, and the Crowns and
Buyer shall agree to such allocations at or prior to the Closing Date. The
parties agree that, except as otherwise provided in section 13.5, the sole
consideration allocable to the Mergers is the Castle B Common Stock. Such
allocations shall be set forth on Schedule 13.9 to this Agreement, and all
allocations contained in such Schedule shall be used by the parties in preparing
all relevant Tax returns, information reports and other Tax documents and forms
(unless a contrary allocation is required pursuant to a final determination of a
relevant Governmental Entity).

    13.10. Survival.  Notwithstanding any other provision in this Agreement,
           --------
this Article 13 shall survive the Closing Date and remain in force until the
expiration of the relevant statutes of limitation (including all periods of
extension, whether automatic or permissive).


                                   ARTICLE 14

                                 Miscellaneous
                                 -------------

    14.1.  Termination of Agreement.  This Agreement may be terminated at any
           ------------------------
time on or prior to the Closing Date (a) by the mutual consent of Sellers and
Buyer; (b) by Sellers or Buyer if the Closing has not taken place by October 31,
1997, and the party seeking to terminate this Agreement has not contributed in
any material way to the failure of the transaction to close by such date; or (c)
by Sellers, if the Buyer has not terminated the Agreement pursuant to clause (x)
of this Section 14.1, below, and Buyer fails or refuses to close the transaction
on the scheduled Closing Date notwithstanding the prior satisfaction or waiver
of all of Buyer's conditions to Closing in Article 11. In addition, this
Agreement may be terminated at any time on or prior to the Due Diligence
Completion Date (x) by Buyer, if Buyer provides a written certification to
Sellers to the effect that Buyer, in good faith, has not confirmed or determined
that it is satisfied in all material respects with respect to the matters
referred to in clause (b) of Section 3.1 and specifying, in reasonable detail,
the reasons supporting such certification; and (y) by Sellers, if Sellers
provide a written certification to Buyer to the effect that Sellers, in good
faith, have not 

                                      -59-
<PAGE>
 
confirmed the matters referred to in clause (a) of Section 3.1 and specifying,
in reasonable detail, the reasons supporting such certification. Any such
certification shall be delivered to the other party on or prior to the Due
Diligence Completion Date.

     14.2  Liabilities Upon Termination.  Except for the obligations contained
           ----------------------------
in Sections 14.3, 14.7, 14.14 and 14.16 hereof, which shall survive any
termination of this Agreement, and except as provided in the next sentence of
this Section 14.2, upon the termination of this Agreement pursuant to Section
14.1 hereof, this Agreement shall forthwith become null and void, and no party
hereto or any of its officers, directors, employees, agents, consultants or
stockholders, shall have any rights, liabilities or obligations hereunder or
with respect hereto. If this Agreement is terminated (a) by Buyer pursuant to
clause (x) of Section 14.1 or by Buyer or Sellers pursuant to clause (a) or (b)
of Section 14.1, then Sellers shall forthwith return to Buyer the Advance
Payment (and any interest or earnings thereon); (b) by Sellers pursuant to
clause (c) of Section 14.1, then Sellers shall retain the Advance Payment (and
any interest or earnings thereon) as liquidated damages; or (c) by Sellers
pursuant to clause (y) of Section 14.1, then Sellers shall retain one-half of
the Advance Payment (together with one-half of any interest or earnings thereon)
as liquidated damages, and shall forthwith return to Buyer the remaining one-
half of the Advance Payment (together with one-half of any interest or earnings
thereon).

     14.3. Expenses.  Each party hereto shall bear all its expenses incurred in
           --------
connection with the transactions contemplated in this Agreement, including
accounting, legal and financial advisory fees incurred in connection herewith;
provided, however, that (i) Buyer shall pay in the first instance any Hart-
- --------  -------
Scott-Rodino filing fees required to be paid in connection with the Hart-Scott-
Rodino applications of both Buyer and Sellers referred to in Section 9.2 hereof,
and at Closing the Crown Parties shall reimburse Buyer for 50% of all such Hart-
Scott-Rodino filing fees promptly upon presentation by Buyer of appropriate
supporting documentation with respect thereto, (ii) the Buyer shall pay any
sales or transfer taxes arising from the transfer of the Acquired Business to
Buyer as provided in Section 13.5, and (iii) Buyer shall pay the cost of any
reasonable and customary title insurance which Buyer elects to obtain with
respect to any interest in Real Property included in the Acquired Business.

     14.4. Bulk Sales Laws.  Buyer hereby waives compliance with the provisions
           ---------------
of any applicable bulk sales law, and Buyer agrees to indemnify and hold Sellers
harmless from all claims made by creditors with respect to non-compliance with
any bulk sales law.

     14.5. Assignments.  No party hereto may assign any of its rights or
           -----------
delegate any of its duties hereunder without the prior written consent of the
other parties, and any such attempted assignment or delegation without such
consent shall be void, except that Buyer may assign any or all of its rights
(but not its obligations) hereunder to CAC III.

     14.6. Further Assurances.  From time to time prior to, at and after the
           ------------------
Closing Date, each party hereto will execute all such instruments and take all
such actions as any other party, being advised by counsel, shall reasonably
request in connection with carrying out and effectuating the intent and. purpose
hereof and all transactions and things contemplated by this Agreement, including
the execution and delivery of any and all confirmatory and other instruments 

                                      -60-
<PAGE>
 
in addition to those to be delivered on the Closing Date, any and all actions
which may reasonably be necessary or desirable to complete the transactions
contemplated hereby.

     14.7. Public Announcement.  Prior to the Closing Date, no party shall,
           -------------------
without the approval of the others, make any press release or other public
announcement concerning the transactions contemplated by this Agreement, except
as and to the extent that such party shall be so obligated by law, in which case
such party shall give advance notice to the other parties and the parties shall
use all reasonable efforts to cause a mutually agreeable release or announcement
to be issued.

     14.8. Notices.  Notices and other communications provided for herein shall
           -------
be in writing (which shall include notice by facsimile transmission) and shall
be delivered or mailed (or if by facsimile communications equipment of the
sending party hereto, delivered by such equipment), addressed as follows:

                 If to any of the Crown Parties:

                       Mr. And Mrs. Robert A. Crown
                       c/o Crown Communications
                       Penn Center West III
                       Suite 229
                       Pittsburgh, PA  15276
                       Facsimile No.:  412-788-0908

                 with a copy to:

                       Kirkpatrick & Lockhart LLP
                       1500 Oliver Building
                       Pittsburgh, Pennsylvania 15222-2312
                       Facsimile No.:  (412) 355-6501

                       Attention:  Charles J. Queenan, Jr., Esq.

                 If to Buyer, CAC I or CAC II:

                       Castle Tower Holding Corp.
                       510 Bering Drive, Suite 310
                       Houston, Texas  77057
                       Facsimile No.:  (713) 974-1926

                       Attention:  David L. Ivy

                                      -61-
<PAGE>
 
                 with a copy to:

                       Cravath, Swaine & Moore
                       Worldwide Plaza
                       825 Eighth Avenue
                       New York, NY  10019
                       Facsimile No.:  (212) 474-1000

                       Attention:  Susan Webster, Esq.

or to such other address as a party may from time to time designate in writing
in accordance with this Section 14.8. All notices and other communications given
to any party hereto in accordance with the provisions of this Agreement shall be
deemed to have been given on the date of receipt.

    14.9.  Captions.  The captions of Articles and Sections of this Agreement
           --------
are for convenience only and shall not control or affect the meaning or
construction of any of the provisions of this Agreement.

    14.10. Governing Law.  This Agreement shall be governed by, construed, and
           -------------
enforced in accordance with the laws of the Commonwealth of Pennsylvania without
regard to conflict of laws principles.

    14.11. Waiver of Provisions.  The terms, covenants, representations,
           --------------------
warranties and conditions of this Agreement may be amended, modified of waived
only by a written instrument executed by the party sought to be bound thereby.
The failure of any party at any time or times to require performance of any
provision of this Agreement shall in no manner affect the right of such party at
a later date to enforce the same. No waiver by any party of any condition or the
breach of any provision, term, covenant, representation or warranty contained in
this Agreement, whether by conduct or otherwise, in any one or more instances
shall be deemed to be or construed as a further or continuing waiver of any such
condition or of the breach of any other provision, term, covenant,
representation or warranty of this Agreement.

    14.12. Counterparts.  This Agreement may be executed in several
           ------------
counterparts, and all counterparts so executed shall constitute one agreement,
binding on the parties hereto, notwithstanding that the parties are not
signatory to the same counterpart.

    14.13. Entire Agreement.  This Agreement and the Confidentiality Agreement
           ----------------
referenced in Section 14.14, including the Schedules, Exhibits and Annexes
hereto, constitute the entire Agreement between the parties and supersede and
cancel any and all prior agreements between them relating to the subject matter
hereof.

    14.14. Confidentiality.  All information provided to Buyer or its
           ---------------
Representatives by or on behalf of Sellers or their affiliates before or after
the date of this Agreement concerning the business, assets, liabilities and
operations of Sellers, the Acquired Business or the Crown Communications
Business shall be governed by the Confidentiality Agreement dated as of June 27,
1997, heretofore executed by Buyer and the Crown Parties. All information
provided to the 

                                      -62-
<PAGE>
 
Crown Parties or their respective Representatives by or on behalf of Buyer or
its affiliates before or after the date of this Agreement concerning the
business, assets, liabilities and operations of Buyer and its Subsidiaries and
affiliates shall be governed by the Confidentiality Agreement dated as of June
27, 1997, heretofore executed by the Crown Parties and Buyer.

    14.15. Submission to Jurisdiction; Waivers.  Each of Buyer, CAC I, CAC II
           -----------------------------------
and the Crown Parties hereby irrevocably and unconditionally:

           (a)   submits for itself and its property in any legal action or
proceeding relating to this Agreement, or for recognition of the enforcement of
any judgment in respect thereof, to the exclusive general jurisdiction of the
courts of the Commonwealth of Pennsylvania, the courts of the United States of
America located in the Commonwealth of Pennsylvania and appellate courts from
any of the foregoing;

           (b)   consents that any such action or proceeding may be brought in
such courts, and waives any objection that it may now or hereafter have to the
venue of any such action or proceeding in any such court or that such action or
proceeding was brought in an inconvenient court and agrees not to plead or claim
the same; and

           (c)   agrees that service of process in any such action or proceeding
may be effected by mailing a copy thereof by registered or certified mail (or
any substantially similar form of mail), postage prepaid, to such party at its
address as provided in Section 14.8 hereof.

    14.16. Brokers or Finders.  Each party agrees to indemnify and hold the
           ------------------
other harmless from and against any and all claims, liabilities, or obligations
with respect to any other fees, commissions or expenses asserted by any Person
on the basis of any act or statement alleged to have been made by the other
party or its Affiliates.

    14.17. Specific Performance.  The parties hereto agree that irreparable
           --------------------
damage would occur in the event any provision of this Agreement was not
performed in accordance with the terms hereof and that the parties shall be
entitled to an injunction or injunctions to prevent breaches of this Agreement
and to enforce specifically the term and provisions of this Agreement in any
courts of the Commonwealth of Pennsylvania or any courts of the United States of
America located in the Commonwealth of Pennsylvania, in addition to any other
remedy to which they are entitled at law or in equity.

    14.18. Definitions; Construction.
           -------------------------

           (a)   As used herein, the following terms shall have the following
meanings:

           "Affiliate" means, with respect to any specified Person, any other
            ---------
Person directly or indirectly controlling or controlled by or under the direct
or indirect common control with such specified Person. Without limiting the
generality of the foregoing, for purposes of this Agreement, CTSH and its
Subsidiaries shall each be deemed to be an Affiliate of Buyer.

                                      -63-
<PAGE>
 
           "Person" means an individual, a corporation, a limited liability
            ------
company, a partnership, a joint venture, a business association, a trust or any
other entity or organization, including a Governmental Entity.

           "Representative" when used with respect to any Person means any
            --------------
directors, officers, employees, stockholders, agents or representatives
(including attorneys, accountants, consultants, banks and financial advisors) of
such Person.

           "Subsidiary" when used with respect to any Person means any other
            ----------
Person, whether incorporated or unincorporated, of which at least a majority of
the securities or other interests having by their terms ordinary voting power to
elect at least a majority of the board of directors or others performing similar
functions with respect to such corporation or other organization is directly or
indirectly owned or controlled by such Person or by any one or more of its
Subsidiaries.

           (b)   The definitions in this Agreement shall apply equally to both
the singular and plural forms of the terms defined. Whenever the context may
require, any pronoun shall include the corresponding masculine, feminine and
neuter forms. The words "include," "includes" and "including" shall be deemed to
be followed by the phrase "without limitation." All references herein to
Articles, Sections, Exhibits and Schedules shall be deemed references to
Articles and Sections of, and exhibits and Schedules to, this Agreement unless
the context shall otherwise require.

    14.19. No Third Party Beneficiaries.  This Agreement is not intended to
           ----------------------------
confer upon any Person other than the parties hereto and their respective
successors and assigns any rights or remedies hereunder.

                                      -64-
<PAGE>
 
     IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed by their duly authorized officers, all as of the day and year first
above written.

                                  ROBERT A. CROWN,
                              
                                  /s/ ROBERT A. CROWN
                                  --------------------------------------------
                                  Individually and as a shareholder of Network 
                                  and Mobile
                              
                                  /s/ ROBERT A. CROWN
                                  --------------------------------------------
                                  Robert A. Crown, d/b/a Crown Communications
                              
                              
                                  BARBARA CROWN,
                              
                                  /s/ BARBARA CROWN
                                  --------------------------------------------
                                  Individually and as a shareholder of Network 
                                  and Mobile
                              
                                  /s/ BARBARA CROWN
                                  --------------------------------------------
                                  Barbara Crown, d/b/a Crown Communications
                              
                              
                                  CROWN NETWORK SYSTEMS, INC.,
                              
                              
                                  By: /s/ ROBERT A. CROWN
                                     -----------------------------------------
                                  Name:    Robert A. Crown
                                  Title:   Chief Executive Officer and 
                                           President


                                  CROWN MOBILE SYSTEMS, INC.,
                                
                                
                                  By: /s/ ROBERT A. CROWN
                                     -----------------------------------------
                                  Name:    Robert A. Crown
                                  Title:   Chief Executive Officer and
                                           President
                                
                                

                                      -65-
<PAGE>
 
                                  CASTLE TOWER HOLDING CORP.,
                                
                                
                                  By: /s/ DAVID L. IVY
                                     -----------------------------------------
                                  Name:    David L. Ivy
                                  Title:   Chief Executive Officer and
                                           President
                                
                                
                                  CASTLE ACQUISITION CORP. I
                                
                                
                                  By: /s/ DAVID L. IVY
                                     -----------------------------------------
                                  Name:    David L. Ivy
                                  Title:   EVP - CFO
                                
                                
                                  CASTLE ACQUISITION CORP. II
                                
                                
                                  By: /s/ DAVID L. IVY
                                     -----------------------------------------
                                  Name:    David L. Ivy
                                  Title:   EVP - CFO

                                      -66-

<PAGE>
 
                                                                     Exhibit 2.2
===============================================================================

                           FIRST AMENDED AND RESTATED

                      ASSET PURCHASE AND MERGER AGREEMENT

                                     among

                          CROWN NETWORK SYSTEMS, INC.,

                          CROWN MOBILE SYSTEMS, INC.,

                                ROBERT A. CROWN,

                                 BARBARA CROWN

                                      and

                          CASTLE ACQUISITION CORP. I,

                          CASTLE ACQUISITION CORP. II,

                           CASTLE TOWER HOLDING CORP.


                                 July 11, 1997,

                   as amended and restated on August 14, 1997


===============================================================================
<PAGE>
 
<TABLE> 
<CAPTION> 
                               TABLE OF CONTENTS

                                                                            Page
<S>                                                                         <C> 
ARTICLE 1.  Purchase and Sale of Assets; Assumption of Liabilities...........  2
 1.1. Crown Communications Assets............................................  2
 1.2. Excluded Assets........................................................  5
 1.3. Assumption of Certain Liabilities; Excluded Liabilities................  6
 1.4. Advance Payment; Payment of Purchase Price.............................  7
 1.5. Certain Definitions....................................................  8
 1.6. Transfer of Section 1.6 Assets.........................................  8
 1.7. Certain FCC Licenses................................................... 10

ARTICLE 2.  The Merger Transactions.......................................... 11
 2.1. The Mergers Generally.................................................. 11
 2.2. Conversion of Shares................................................... 12
 2.3. Surrender and Payment.................................................. 13

ARTICLE 3.  Due Diligence Investigation...................................... 14
 3.1. Due Diligence Investigation Generally.................................. 14
 3.2. Interim Financial Statements........................................... 14

ARTICLE 4.  Closing; Deliveries of the Parties at Closing.................... 15
 4.1. The Closing............................................................ 15
 4.2. Deliveries at the Closing by the Crown Parties......................... 15
 4.3. Deliveries at the Closing by Buyer..................................... 16
 4.4. Time is of the Essence................................................. 18

ARTICLE 5.  Representations and Warranties of the Crown Parties.............. 18
 5.1. Corporate Status; Authority............................................ 18
 5.2. Corporate Action....................................................... 18
 5.3. Authority; Execution................................................... 19
 5.4. No Conflicts........................................................... 19
 5.5. Capitalization of Network.............................................. 20
 5.6. Capitalization of Mobile............................................... 20
 5.7. Equity Interests....................................................... 20
 5.8. Title to the Crown Stock............................................... 21
 5.9. Financial Statements................................................... 21
 5.10. No Undisclosed Liabilities............................................ 22
 5.11. Absence of Certain Changes or Events.................................. 22
 5.12. Licenses.............................................................. 23
 5.13. Sufficiency of Assets................................................. 24
 5.14. Assets Other than Real Property Interests............................. 24
 5.15. Title to Real Property................................................ 25
 5.16. Intellectual Property................................................. 25
</TABLE> 

                                      -i-
<PAGE>
 
<TABLE> 
<S>                                                                          <C>
 5.17. Employees............................................................. 26
 5.18. Litigation............................................................ 28
 5.19. Brokers............................................................... 28
 5.20. Contracts............................................................. 28
 5.21. Compliance with Laws.................................................. 30
 5.22. Environmental Matters................................................. 30
 5.23. Taxes................................................................. 32
 5.24. Insurance............................................................. 33
 5.25. Accounts Receivable................................................... 34
 5.26. Securities Act........................................................ 34
 5.27. Transactions with Affiliates.......................................... 34
 5.28. Disclosure............................................................ 34

ARTICLE 6.  Representations and Warranties of Buyer.......................... 35
 6.1. Corporate Status; Authority............................................ 35
 6.2. Corporate Action....................................................... 35
 6.3. No Conflicts........................................................... 35
 6.4. Capitalization of Buyer and its Subsidiaries and CTSH and its
      Subsidiaries........................................................... 36
 6.5. Equity Interests....................................................... 38
 6.6. Financial Statements................................................... 38
 6.7. No Undisclosed Liabilities............................................. 39
 6.8. Absence of Certain Changes or Events................................... 39
 6.9. Licenses............................................................... 39
 6.10. Assets Other than Real Property Interests............................. 40
 6.11. Title to Real Property................................................ 41
 6.12. Intellectual Property................................................. 41
 6.13. Employees............................................................. 42
 6.14. Litigation............................................................ 43
 6.15. Brokers............................................................... 44
 6.16. Contracts............................................................. 44
 6.17. Compliance with Laws.................................................. 46
 6.18. Environmental Matters................................................. 46
 6.19. Taxes................................................................. 47
 6.20. Insurance............................................................. 48
 6.21. Disclosure............................................................ 48

ARTICLE 7.  Covenants of Sellers............................................. 48
 7.1. Operation of the Business.............................................. 49
 7.2. Consents............................................................... 51
 7.3. Notice of Proceedings.................................................. 52
 7.4. No Solicitation........................................................ 52
 7.5. Cooperation............................................................ 52

ARTICLE 8.  Covenants of Buyer............................................... 53
 8.1. Operation of the Business.............................................. 53
 8.2. Notice of Proceedings.................................................. 54
</TABLE> 
                           
                                     -ii-
<PAGE>
 
<TABLE> 

<S>                                                                          <C>
 8.3. Corporate Name and Symbol.............................................. 54
 8.4. Liquidity Provision.................................................... 55

ARTICLE 9.  Mutual Covenants of the Parties.................................. 55
 9.1. Executive Compensation................................................. 55
 9.2. Hart-Scott-Rodino...................................................... 55
 9.3. Access to Facilities, Files and Records................................ 56
 9.4. Advice of Changes...................................................... 56
 9.5. Consummation of Agreement.............................................. 56
 9.6. No Solicitation of Employees........................................... 56
 9.7. Standstill............................................................. 56

ARTICLE 10.  Conditions to the Obligations of the Crown Parties.............. 58
 10.1. No Buyer Material Adverse Effect; Representations and Warranties and
       Covenants............................................................. 58
 10.2. Proceedings........................................................... 58
 10.3. Hart-Scott-Rodino..................................................... 58
 10.4. Deliveries............................................................ 58

ARTICLE 11.  Conditions to the Obligations of Buyer, CAC I and CAC II........ 59
 11.1. No Crown Material Adverse Effect; Representations, Warranties and
       Covenants............................................................. 59
 11.2. Proceedings........................................................... 59
 11.3. Hart-Scott-Rodino..................................................... 59
 11.4. Deliveries............................................................ 59
 11.5. Robert A. Crown....................................................... 60
 11.6. Uminski Employment Agreement.......................................... 60
 11.7. FCC Authorization..................................................... 60

ARTICLE 12.  Survival of Representations and Warranties...................... 60
 12.1. Survival.............................................................. 60
 12.2. Indemnification....................................................... 60

ARTICLE 13  Tax-Related Matters.............................................. 64
 13.1. Closing of Tax Year................................................... 64
 13.2. Filing of Tax Returns................................................. 64
 13.3. Tax Audits, Etc....................................................... 65
 13.4. Tax Indemnification................................................... 66
 13.5. Transfer Taxes, Etc................................................... 67
 13.6. Tax Certificate....................................................... 67
 13.7. Tax Agreements........................................................ 67
 13.8. Access to Books and Records........................................... 67
 13.9. Allocation of Crown Value............................................. 68
 13.10. Survival............................................................. 68

ARTICLE 14  Miscellaneous.................................................... 68
 14.1. Termination of Agreement.............................................. 68
 14.2. Liabilities Upon Termination.......................................... 69
</TABLE>                                                                      

                                     -iii-
<PAGE>
 
<TABLE> 

<S>                                                                           <C> 
 14.3. Expenses.............................................................. 69
 14.4. Bulk Sales Laws....................................................... 69
 14.5. Assignments........................................................... 69
 14.6. Further Assurances.................................................... 70
 14.7. Public Announcement................................................... 70
 14.8. Notices............................................................... 70
 14.9. Captions.............................................................. 71
 14.10. Governing Law........................................................ 71
 14.11. Waiver of Provisions................................................. 71
 14.12. Counterparts......................................................... 72
 14.13. Entire Agreement..................................................... 72
 14.14. Confidentiality...................................................... 72
 14.15. Submission to Jurisdiction; Waivers.................................. 72
 14.16. Brokers or Finders................................................... 73
 14.17. Specific Performance................................................. 73
 14.18. Definitions; Construction............................................ 73
 14.19. No Third Party Beneficiaries......................................... 74
</TABLE> 


                                    EXHIBITS
                                    --------

Exhibit A        Excluded Personal Property
Exhibit B        Note
Exhibit C        Buyer EBITDA
Exhibit D        Acquired Business EBITDA
Exhibit E        Shareholder Agreement
Exhibit F        FCC Letter Agreement
Exhibit G        Crown Name Agreement
Exhibit H        Tower Agreement

                                   SCHEDULES
                                   ---------

Schedule 1.1(c)  Excluded Real Property
Schedule 1.1(d)  Excluded Contracts
Schedule 1.6     Schedule 1.6 Towers
Schedule 1.7     Excluded License
Schedule 5.4     No Conflicts - Crown
Schedule 5.7     Equity Interests - Crown
Schedule 5.9     Financial Statements - Crown
Schedule 5.11    Absence of Certain Changes - Crown
Schedule 5.12    Licenses - Crown
Schedule 5.14    Personal Property and Liens - Crown
Schedule 5.15    Real Property - Crown
Schedule 5.16    Intellectual Property - Crown
Schedule 5.17    Employee Matters - Crown


                                     -iv-
<PAGE>
 
Schedule 5.18    Litigation - Crown
Schedule 5.20    Contracts - Crown
Schedule 5.21    Compliance With Laws - Crown
Schedule 5.22    Environmental Matters - Crown
Schedule 5.23(b) Tax Returns - Crown
Schedule 5.23(c) Taxing Jurisdictions - Crown
Schedule 5.24    Insurance - Crown
Schedule 5.27    Transactions with Affiliates - Crown
Schedule 6.3     No Conflicts - Buyer
Schedule 6.4(a)  Capitalization of Buyer's Subsidiaries
Schedule 6.4(b)  Capitalization of CTSH's Subsidiaries
Schedule 6.5     Equity Interests - Buyer
Schedule 6.6(a)  Financial Statements - Buyer
Schedule 6.6(b)  Financial Statements - CTSH
Schedule 6.7     No Undisclosed Liabilities - Buyer
Schedule 6.9     Licenses - Buyer
Schedule 6.10    Liens - Buyer
Schedule 6.11    Real Property - Buyer
Schedule 6.12    Intellectual Property - Buyer
Schedule 6.13    Employee Matters - Buyer
Schedule 6.14    Litigation - Buyer
Schedule 6.16    Contracts - Buyer
Schedule 6.17    Compliance With Laws - Buyer
Schedule 6.18    Environmental Matters - Buyer
Schedule 6.20    Insurance - Buyer
Schedule 9.1     Key Employees
Schedule 13.9    Allocation of Crown Value

                                      -v-
<PAGE>
 
<TABLE> 
<CAPTION> 
                              Table of Definitions
                                        

Term                                                                     Section
- ----                                                                     -------
<S>                                                                      <C>
Acquired Business                                                            1.5
Acquisition Financing                                                        7.5
Advance Payment                                                         recitals
Affiliate                                                               14.18(a)
Amended and Restated Credit Agreement                                     4.2(j)
Assumed Contracts                                                         1.1(d)
Assumed Liabilities                                                       1.3(a)
BANM                                                                      1.6(b)
BANM Notice                                                               1.6(b)
Bank Credit Agreement                                                        6.3
BBC Agreement                                                                6.3
Bell Atlantic Agreement                                                   1.6(b)
Bell Atlantic Property                                                    1.6(b)
BellSouth                                                                 1.6(c)
BellSouth Agreement                                                       1.6(c)
BellSouth Property                                                        1.6(c)
Benefit Plan                                                             5.17(c)
Buyer                                                                   preamble
Buyer Audited Statements                                                  6.6(a)
Buyer Benefit Plan                                                       6.13(c)
Buyer's Damages                                                          12.2(a)
Buyer Environmental Audits                                               6.18(a)
Buyer Financial Statements                                                6.6(a)
Buyer Interim Financial Statements                                        3.2(b)
Buyer Leased Property                                                       6.11
Buyer Material Adverse Effect                                                6.1
Buyer Owned Property                                                        6.11
Buyer Permitted Liens                                                    6.19(a)
Buyer Properties                                                         6.10(a)
Buyer Property                                                              6.11
Buyer Scheduled Contract                                                    6.16
Buyer Transaction Documents                                               4.3(k)
CAC I                                                                   preamble
CAC II                                                                  preamble
CAC III                                                                   1.4(b)
Cash and Investments                                                      1.1(k)
Castle A Common Stock                                                        6.4
Castle B Common Stock                                                     1.4(b)
</TABLE> 

                                     -vi-
<PAGE>
 
<TABLE> 
<CAPTION> 

Term                                                                     Section
- ----                                                                     -------
<S>                                                                      <C>
Closing                                                                   4.1(a)
Closing Date                                                              4.1(a)
Code                                                                    recitals
Communications Act                                                          5.12
Compensating Incremental Amount                                           1.6(g)
Contracts                                                                 1.1(d)
Crown Audited Statements                                                  5.9(a)
Crown Benefit Plan                                                       5.17(c)
Crown Communications Assets                                                  1.1
Crown Communications Business                                           recitals
Crown Environmental Audits                                               5.22(a)
Crown Financial Statements                                                5.9(b)
Crown Interim Financial Statements                                        3.2(a)
Crown Leased Property                                                       5.15
Crown Material Adverse Effect                                                5.1
Crown Name Agreement                                                      4.2(i)
Crown Owned Property                                                        5.15
Crown Parties                                                           preamble
Crown Permitted Liens                                                    5.14(a)
Crown Permitted Real Estate Liens                                           5.15
Crown Properties                                                            5.15
Crown Property                                                              5.15
Crown Stock                                                           2.2(a)(ii)
Crown Symbol                                                              1.1(e)
Crown Territory                                                           9.7(a)
Crown Transaction Documents                                               4.2(g)
Crown Unaudited Statements                                                5.9(a)
Crowns                                                                  preamble
CTSH                                                                    recitals
CTSH Audited Statements                                                   6.6(b)
CTSH Financial Statements                                                 6.6(b)
CTSH Interim Financial Statements                                         3.2(b)
CTSH Stock                                                                6.4(b)
December 31 Crown Balance Sheets                                         5.14(a)
December 31 Buyer Balance Sheet                                          6.10(a)
Due Diligence Completion Date                                                3.1
Easement Agreement                                                        4.2(k)
EBITDA                                                                       3.1
Effective Time                                                            2.1(b)
Environmental Laws                                                       5.22(c)
Environmental Permits                                                    5.22(b)
ERISA                                                                    5.17(c)
Excluded Assets                                                              1.2
</TABLE> 


                                     -vii-
<PAGE>
 
<TABLE> 
<CAPTION> 

Term                                                                     Section
- ----                                                                     -------
<S>                                                                      <C>
Excluded Contracts                                                        1.1(d)
Excluded License                                                             1.7
Excluded Liabilities                                                  1.3(b)(ii)
Excluded Real Property                                                    1.1(c)
FAA                                                                         5.12
FCC Letter Agreement                                                      4.2(h)
Final S Tax Period(s)                                                       13.1
GAAP                                                                      5.9(b)
Governmental Entity                                                       1.1(a)
Hart-Scott-Rodino Act                                                        5.4
Hazardous Material                                                       5.22(c)
Incremental Amount                                                        1.6(e)
Indemnified Party                                                        12.2(e)
Intellectual Property                                                     1.1(e)
IRS                                                                      5.17(g)
Licenses                                                                  1.1(a)
Liens                                                                        1.1
Loss                                                                     12.2(c)
Merger Consideration                                                      2.2(c)
Mergers                                                                 recitals
Mobile                                                                  preamble
Mobile Common Stock                                                   2.2(a)(ii)
Mobile Merger                                                           recitals
Mobile Merger Consideration                                               2.2(c)
Mobile Share                                                                 5.6
Mobile Surviving Corporation                                              2.1(a)
Network                                                                 preamble
Network Common Stock                                                   2.2(a)(i)
Network Merger                                                          recitals
Network Merger Consideration                                              2.2(c)
Network Shares                                                               5.5
Network Surviving Corporation                                             2.1(a)
New Business                                                                 9.7
Note                                                                      1.4(b)
PBCL                                                                      2.1(a)
PCBs                                                                     5.22(b)
Person                                                                  14.18(a)
Pledge Agreement                                                          9.7(c)
Pre-Closing Tax Return                                                   13.2(a)
Preferred Stock                                                              6.4
Property Taxes                                                           13.4(i)
Purchase Price                                                            1.4(a)
Real Property                                                             1.1(c)
</TABLE> 

                                    -viii-
<PAGE>
 
<TABLE> 
<CAPTION> 

Term                                                                     Section
- ----                                                                     -------
<S>                                                                      <C>
Receivables                                                               1.1(g)
Related Person                                                           5.20(i)
Release                                                                  5.22(c)
Representative                                                          14.18(a)
Restricted Activities                                                     9.7(a)
Returns                                                                  5.23(a)
Schedule 1.6 Towers                                                       1.6(a)
Section 1.6 Asset                                                         1.6(d)
Section 1.6 Assets                                                        1.6(d)
Securities Act                                                              5.26
Sellers                                                                 preamble
Sellers' Damages                                                         12.2(b)
Seller Scheduled Contract                                                   5.20
Shareholder Agreement                                                     4.2(f)
Straddle Period                                                             13.4
Subsidiary                                                              14.18(a)
Tax Amount                                                                1.4(a)
Tax Controversy                                                             13.3
Tax Indemnification Period                                                  13.4
Taxes                                                                    5.23(a)
Third Party Claim                                                        12.2(e)
</TABLE> 

                                     -ix-
<PAGE>
 
                         FIRST AMENDED AND RESTATED ASSET PURCHASE AND MERGER
               AGREEMENT dated as of July 11, 1997, as amended and restated on
               August 14, 1997, among Crown Network Systems, Inc., a
               Pennsylvania corporation ("Network"), Crown Mobile Systems, Inc.,
                                          -------                               
               a Pennsylvania corporation ("Mobile"), Robert A. Crown,
                                            ------                    
               individually and as a shareholder of Network and Mobile, Barbara
               Crown, individually and as a shareholder of Network and Mobile
               (Robert A. Crown and Barbara Crown, referred to together as
               "Sellers" or the "Crowns" and, the Crowns, individually and d/b/a
               --------          ------                                         
               Crown Communications, together with Network and Mobile, referred
               to as the "Crown Parties"), Castle Acquisition Corp. I, a
                          -------------                                 
               Pennsylvania corporation ("CAC I"), Castle Acquisition Corp. II,
                                          -----                                
               a Pennsylvania corporation ("CAC II"), and Castle Tower Holding
                                            ------                            
               Corp., a Delaware corporation ("Buyer").
                                               -----   


                                   RECITALS:
                                   -------- 

     1.   Sellers own and operate a communications site acquisition, ownership,
design, development, construction, management and servicing business that
operates under the name of Crown Communications (the "Crown Communications
                                                      --------------------
Business"), including certain real estate, leases, licenses, management
- --------                                                               
agreements, towers, contracts and other assets described in more detail below.
Sellers also own and operate Network and Mobile.

     2.   Sellers desire to sell, assign and transfer to Buyer, and Buyer
desires to purchase from Sellers, all the assets and properties used or held for
use in connection with the Crown Communications Business, all as described in
more detail below, all on the terms and subject to the conditions described
herein. In connection therewith, Buyer will assume certain liabilities and
obligations of the Crown Communications Business as further described herein.

     3.   Simultaneously with the sale of assets described above, the parties
intend to effect a merger of CAC I with and into Network, with Network being the
surviving corporation (the "Network Merger"), and a merger of CAC II with and
                            --------------
into Mobile, with Mobile being the surviving corporation (the "Mobile Merger")
                                                               -------------
and, together with the Network Merger, the "Mergers").
                                            -------
     4.   It is the intention of the parties that for United States Federal
income tax purposes each of the Mergers shall qualify as a "reorganization"
within the meaning of Section 368(a) of the Internal Revenue Code of 1986 (the
"Code") and that the purchase of the Crown Communications Business will be a
 ----
taxable transaction.

     5.   It is the further intention of the parties, promptly following the
execution and delivery of this Agreement and the receipt by Sellers of an
advance payment by Buyer in the amount of $10,000,000 (the "Advance Payment"),
                                                            ---------------
by wire transfer of immediately available Pittsburgh funds to an account
specified by Sellers, that Sellers, on the one part, and Buyer, on the other
part, each shall commence a confirmatory due diligence investigation, including
a review of the businesses, assets, operations, properties, condition (financial
and otherwise), contingent liabilities, prospects (including projected EBITDA
(as defined herein)) and material agreements of 
<PAGE>
 
the Buyer and its Subsidiaries and Castle Transmission Services (Holdings) Ltd.
("CTSH") and its Subsidiaries by Sellers and of the Crown Communications
  ----
Business, Network and Mobile by Buyer. The closing of the transactions
contemplated hereby shall be subject to the satisfactory completion of such
investigation as more fully set forth in Article 3, and the disposition of the
Advance Payment shall be as more fully set forth in Sections 1.4 and 14.2.

     6.   Buyer has advised Sellers that it intends to complete a reorganization
of equity interests in CTSH such that, upon completion thereof, Buyer or its
successor will hold at least a majority of the outstanding equity interests of
CTSH; provided, however, that in no event shall the completion by Buyer of such
      --------  -------
a reorganization be deemed to constitute a condition to Sellers' obligation to
close the transaction contemplated hereby.


     NOW, THEREFORE, in consideration of the foregoing and of other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, and intending to be legally bound, the parties agree as follows:


                                   ARTICLE 1.


             Purchase and Sale of Assets; Assumption of Liabilities
             ------------------------------------------------------


     1.1.  Crown Communications Assets. Subject to and in reliance upon the
           ---------------------------
representations, warranties and agreements herein set forth, and subject to the
terms and conditions herein contained, on the Closing Date (as defined herein)
(or (x) in the case of the purchase by Buyer of any Section 1.6 Assets, on the
date specified in Section 1.6 or (y) in the case of the FCC Licenses listed on
Schedule 1.7, on the date specified in Section 1.7), Sellers shall grant,
convey, sell, assign, transfer and deliver to Buyer, and Buyer shall purchase,
free and clear of all liabilities and obligations, as well as all covenants,
restrictions, mortgages, liens, security interests, claims, pledges, easements,
assignments, subleases, covenants, rights-of-way, options, rights of refusal,
charges, leases, licenses, defects in title, encumbrances and any other
restriction of any kind or nature (collectively, "Liens") except only those
                                                  -----
liabilities, obligations and Liens which are to be assumed by Buyer pursuant to
Section 1.3 hereof and except Crown Permitted Liens (as defined herein) and
Crown Permitted Real Estate Liens (as defined herein), all properties, assets,
privileges, rights, interests and claims, real and personal, tangible and
intangible, of every type and description, wherever located, including the Crown
Communications Business as a going concern and goodwill, that are owned by
Sellers and used or held for use in connection with the Crown Communications
Business (the "Crown Communications Assets"), except for those assets which are
               ---------------------------
expressly excluded pursuant to Section 1.2 hereof, and except for any Section
1.6 Assets with respect to which BANM or BellSouth (each as defined herein)
shall have exercised its right of first refusal. Without limiting the foregoing,
the Crown Communications Assets shall include the following:

           (a)  Licenses and Authorizations. All licenses, permits, franchises,
                ---------------------------
certificates of compliance, consents, approvals and authorizations by any
Federal, state or local government or any subdivision thereof or any court,
administrative agency or commission or other governmental agency or authority (a
"Governmental Entity") (and including the FCC Licenses
 -------------------

                                      -2-
<PAGE>
 
listed on Schedule 1.7, if such FCC Licenses are transferred to Buyer in
accordance with Section 1.7) (all the foregoing, including any renewals,
extensions or modifications thereof and additions thereto and any pending
applications therefor, being referred to herein as "Licenses") that are held by
                                                    --------
Sellers and used or held for use in connection with the Crown Communications
Business, including those Licenses listed on Schedule 5.12, together with any
Licenses acquired as permitted by the terms of this Agreement between July 11,
1997 and the Closing Date.

     (b)   Tangible Personal Property. All physical assets, equipment, vehicles,
           --------------------------
furniture, fixtures, office materials and supplies, spare parts, and other
tangible personal property of every kind and description owned, leased or
licensed by Sellers as of July 11, 1997 and used or held for use in connection
with the Crown Communications Business, including those items described
generally on Schedule 5.14 (and including any Section 1.6 Assets, if and to the
extent transferred to Buyer in accordance with Section 1.6), and any additions,
improvements, replacements and alterations thereto made as permitted by the
terms of this Agreement between July 11, 1997 and the Closing Date, in each case
other than any tangible personal property consumed in the ordinary course of
business and operations of the Crown Communications Business from July 11, 1997
to the Closing Date.

     (c)   Real Property.  All land and leaseholds, and other estates in real
           -------------
property and appurtenances thereto, and all easements, privileges, rights-of-
way, riparian and other water rights, lands underlying any adjacent streets or
roads, appurtenances, licenses, permits and other rights pertaining to or
accruing to the benefit of such real property and leasehold interests and
estates in real property, buildings, towers, transmitters, antennae and
warehouses, and fixtures and improvements thereon (and including any Section 1.6
Assets, if and to the extent transferred to Buyer in accordance with Section
1.6) ("Real Property") owned, leased or licensed by Sellers as of July 11, 1997
       -------------                                                           
and used or held for use in connection with the Crown Communications Business,
including those described generally on Schedule 5.15, and any additions,
improvements, replacements and alterations thereto made as permitted by the
terms of this Agreement between July 11, 1997 and the Closing Date, but
excluding the Real Property listed on Schedule 1.1(c) (the "Excluded Real
                                                            -------------
Property").
- --------

     (d)   Contracts.  All contracts, leases, licenses (other than Licenses),
           ---------                                                         
indentures, agreements, commitments and all other legally binding arrangements,
whether oral or written, express or implied (and including any Section 1.6
Assets, if and to the extent transferred to Buyer in accordance with Section
1.6) ("Contracts") entered into in connection with the Crown Communications
       ---------                                                           
Business, including those listed on Schedule 5.20, together with all Contracts
entered into as permitted by the terms of this Agreement between July 11, 1997
and the Closing Date (collectively, the "Assumed Contracts"), but excluding the
                                         -----------------                     
Contracts listed on Schedule 1.1(d) (the "Excluded Contracts").
                                          ------------------   

     (e)   Trademarks, etc. All trademarks (registered or unregistered), service
           ---------------
marks, franchises, patents, trade names, jingles, slogans, and logotypes,
copyrights and other intangible rights, including any applications therefor and
other material intellectual property and proprietary rights, whether or not
subject to statutory registration or protection (the "Intellectual Property"),
                                                      ---------------------
in each case owned, leased or licensed by Sellers and used or held for use as of
July 11, 1997 in connection with the Crown Communications Business, including
the current 

                                      -3-
<PAGE>
 
Crown corporate symbol (the "Crown Symbol") and other Intellectual Property
                             ------------
described generally on Schedule 5.16, and any Intellectual Property acquired by
Sellers in connection with the Crown Communications Business as permitted by the
terms of this Agreement between July 11, 1997 and the Closing Date.

     (f)   Files and Records.  All files, records, books of account, general,
           -----------------                                                 
financial, accounting and personnel records, invoices, computer programs, tapes,
electronic data processing software, customer and supplier lists, correspondence
and other records of Sellers used or held for use by or otherwise relating to
the Crown Communications Business.

     (g)   Prepaid Expenses and Receivables; Other Current Assets.  All prepaid
           ------------------------------------------------------              
expenses (other than prepaid Taxes (as defined in Section 5.23)) and notes and
accounts receivable ("Receivables") and any other current assets arising in
                      -----------                                          
connection with the Crown Communications Business and existing on the Closing
Date.

     (h)   Security Deposits.  All security deposits held by third parties for
           -----------------                                                  
the benefit of the Crown Communications Business on the Closing Date.

     (i)   Claims. All rights, claims, credits or causes of action against third
           ------
parties relating to or arising out of the Crown Communications Business, except
any and all claims of Sellers for refunds of Taxes paid or attributable to a
taxable period (or portion thereof) ending on or prior to the Closing, and
except for any claims relating to or arising out of the matters described in
clause (i) of Section 1.3(b).

     (j)   Goodwill.  All Sellers' goodwill in, and the going concern value of,
           --------                                                            
the Crown Communications Business.

     (k)   Cash and Investments.  All cash on hand or in bank accounts and other
           --------------------                                                 
cash items, cash equivalents and short-term investments (collectively, "Cash and
                                                                        --------
Investments") held in connection with the Crown Communications Business on the
- -----------                                                                   
Closing Date.

     (l)   Insurance.  All insurance policies and insurance contracts listed on
           ---------                                                           
Schedule 5.24 with respect to coverage provided from and after the Closing Date,
together with any claim, chose in action or other right Sellers may have to
insurance coverage under past and present insurance policies and insurance
contracts (including the insurance policies and insurance contracts listed on
Schedule 5.24) insuring the Crown Communications Business with respect to any
and all Crown Communications Assets and Assumed Liabilities, in each case
together with any proceeds received by Sellers from any such policy or contract
after Closing with respect to any Crown Communications Assets or any Assumed
Liabilities to the full extent that such assignment and conveyance is
permissible under the law and under such insurance policies and insurance
contracts.

     Notwithstanding the foregoing:  (i) Sellers shall retain the rights to
make claims under, and to receive insurance proceeds from, the insurance
policies and insurance contracts and any proceeds thereof insuring the Crown
Communications Business, including those listed on Schedule 5.24, to the extent
that such insurance policies and contracts provide coverage for any 

                                      -4-
<PAGE>
 
Excluded Asset (as herein defined) and Excluded Liability (as herein defined),
including but not limited to the matters described in clause (i) of Section
1.3(b), together with any proceeds received by Buyer from any such policy or
contract after Closing to the extent such proceeds are with respect to any
Excluded Assets or Excluded Liabilities; (ii) in the event that Sellers seek to
recover for loss to an Excluded Asset or for an Excluded Liability under
insurance policies or insurance contracts covering the Crown Communications
Business, Sellers shall be responsible for satisfying any and all deductibles or
self-insurance obligations applicable to such claim for coverage of a loss to an
Excluded Asset or for coverage of an Excluded Liability; (iii) in the event that
Buyer seeks to recover a loss to a Crown Communications Asset or for an Assumed
Liability under any insurance policies or contracts covering the Crown
Communications Business, Buyer shall be responsible for satisfying any and all
deductibles or any self-insurance obligations applicable to such claim for
coverage of a loss to a Crown Communication Asset or for an Assumed Liability;
and (iv) in the event that Sellers and Buyer both make claims for coverage under
the same insurance policy and insufficient policy limits are available to
satisfy both claims, the earlier-presented claim shall take priority and shall
be satisfied before the later-presented claim, which shall be satisfied only to
the extent available policy limits remain for such later-presented claim.
Sellers hereby represent and warrant to Buyer that, except for the matters
referred to in Section 1.3(b)(i) and except for workers compensation, automobile
insurance and inland marine claims in the ordinary course of business, there are
no outstanding claims under any past or present insurance policy or insurance
contract insuring the Crown Communications Business and, to the knowledge of
Sellers, there are not any existing facts or circumstances that could reasonably
be expected to form the basis of or give rise to any claim under any such
insurance policy or insurance contract.


     1.2.  Excluded Assets. The following shall be excluded from the Crown
           ---------------
Communications Assets and retained by Sellers (the "Excluded Assets"):
                                                    ---------------
           (a) Certain Claims. Any and all claims of Sellers for refunds of
               --------------
Taxes paid or attributable to a taxable period (or portion thereof) ending on or
prior to the Closing, and any and all claims relating to or arising out of the
matters described in clause (i) of Section 1.3(b);

           (b) Certain Personal Property. All items of personal property listed
               -------------------------
on Exhibit A;

           (c) Section 1.6 Assets. Any Section 1.6 Assets with respect to which
               ------------------
BANM or BellSouth, as the case may be, shall have exercised its right of first
refusal;

           (d) Excluded Real Property.  All Excluded Real Property; and
               ----------------------                                  

           (e) Excluded Contracts.  All Excluded Contracts.
               ------------------                          


     1.3.  Assumption of Certain Liabilities; Excluded Liabilities.
           ------------------------------------------------------- 

           (a) Upon the terms and subject to the conditions of this Agreement,
effective as of the Closing Date (and, with respect to any Assumed Contracts or
other liabilities and obligations relating to or arising out of the Section 1.6
Assets, on the date the relevant Section 1.6

                                      -5-
<PAGE>
 
Assets are transferred to Buyer pursuant to Section 1.6), Buyer shall assume and
agree to pay, perform and discharge when due, and indemnify Sellers and hold
each of them harmless from the following liabilities and obligations of the
Crown Communications Business (the "Assumed Liabilities"):
                                    -------------------   

               (i)   outstanding indebtedness of the Crown Communications
     Business, including approximately $20.5 million in the aggregate
     outstanding as of May 31, 1997 and additional indebtedness incurred
     thereafter in the ordinary course of business; provided, however, that the
                                                    --------  -------
     aggregate amount of outstanding indebtedness assumed will not exceed (A)
     $25 million, plus (B) the aggregate amount of any additional indebtedness
     incurred with the written consent of Buyer pursuant to Section 7.1.

               (ii)  trade payables and other accounts payable reflected on the
     balance sheet as of June 30, 1997 of Crown Communications included as part
     of the Crown Interim Financial Statements (as defined herein) and those
     arising thereafter in the ordinary course of business consistent with past
     practice (including trade payables and other accounts payable relating to
     or arising out of the Section 1.6 Assets, if and to the extent the relevant
     Section 1.6 Assets are transferred to Buyer in accordance with Section
     1.6);

               (iii) all liabilities and obligations of Sellers arising under or
     relating to the Assumed Contracts (including Assumed Contracts relating to
     the Section 1.6 Assets, if and to the extent the relevant Section 1.6
     Assets are transferred to Buyer in accordance with Section 1.6); and

               (iv)  all other liabilities and obligations of Sellers arising in
     the ordinary course of business consistent with past practice, up to $2
     million in the aggregate (including other liabilities and obligations
     relating to or arising out of the Section 1.6 Assets, if and to the extent
     the relevant Section 1.6 Assets are transferred to Buyer in accordance with
     Section 1.6).

           (b) Buyer shall in no event assume, nor shall it be liable for:

               (i)   all liabilities and obligations of the Sellers arising
     under, relating to or based on (x) three lawsuits filed in the United
     States District Court for the Western District of Pennsylvania which have
     been consolidated at Civil Action No. 95-639 and which are captioned: (A)
     Kimberly Minto, Guardian and next-of-kin of Terry R. Frye, an incapacitated
     ---------------------------------------------------------------------------
     person, plaintiff v. Bell Atlantic Mobile Systems, Inc., UNR-ROHN, a
     --------------------------------------------------------------------
     division of UNR Industries, Inc. v. Crown Corporation, Crown Communications
     ---------------------------------------------------------------------------
     and Crown Network Systems, Inc., at No. C.A. 95-639; (B) William J. Bowser,
     ---------------------------------------------------------------------------
     Plaintiff, v. Bell Atlantic Mobile Systems, Inc., UNR-ROHN, a division of
     -------------------------------------------------------------------------
     UNR Industries, Inc., Defendants v. Crown Corporation, Crown Communications
     ---------------------------------------------------------------------------
     and Crown Network Systems, Inc., Third-Party Defendants, at No. C.A. 95-942
     ---------------------------------------------------------------------------
     and (C) Toby K. Jurecko V. Bell Atlantic Mobile Systems, Inc., UNR-ROHN, a
     --------------------------------------------------------------------------
     division of  UNR Indust., Inc., Defendants v. Crown, Crown Communications,
     --------------------------------------------------------------------------
     Third Party Defendant, at No. C.A. 97-260, or (y) the facts and
     -----------------------------------------                      
     circumstances or events relating to such lawsuits; and

                                      -6-
<PAGE>
 
           (ii)  any other obligations or liabilities of Sellers of any nature
     whatsoever (whether express or implied, fixed or contingent, known or
     unknown) other than the Assumed Liabilities (all obligations and
     liabilities of Sellers under clauses (i) and (ii) of this paragraph are
     referred to herein collectively as the "Excluded Liabilities").  Without
                                             --------------------            
     limiting the foregoing, Buyer shall not be deemed to assume any liabilities
     relating to or arising out of any Excluded Assets or any liabilities for
     any Taxes, other than liability for transfer taxes to the extent assumed by
     Buyer pursuant to Section 14.3.


     1.4. Advance Payment; Payment of Purchase Price.
          ------------------------------------------ 

          (a)  The total consideration for the Crown Communications Assets
(including the Section 1.6 Assets) shall consist of (i) the sum of (A)
$100,000,000 plus (B) $1,229,828 (the "Tax Amount") in cash, (ii) 25,000 fully
paid and nonassessable shares of Class B Common Stock, par value $0.01 per
share, of Buyer (the "Castle B Common Stock"), and (iii) the assumption by Buyer
                      ---------------------
of the Assumed Liabilities (clauses (i), (ii) and (iii), collectively, the
"Purchase Price"). The Advance Payment shall be applied at Closing against the
 --------------
cash portion of the Purchase Price, subject to the provisions of Article 3 and
Sections 14.1 and 14.2.

          (b)  On the Closing Date, Buyer shall pay, or cause to be paid, to
Sellers for the Crown Communications Assets other than the Section 1.6 Assets
(i) by wire transfer of $15,000,000 ($25,000,000 less the Advance Payment) in
immediately available Pittsburgh funds to an account specified by Sellers in
writing at least two business days prior to the Closing, (ii) by delivery to
Sellers of a negotiable promissory note of Buyer in substantially the form of
Exhibit B (the "Note") and (iii) by delivery to Sellers of 12,667 shares of
                ----
Castle B Common Stock. The initial principal amount payable under the Note shall
be equal to $2,582,970, which amount shall be subject to increase in accordance
with Section 1.6. The Note shall be due on October 31, 1997 (subject to earlier
maturity 30 days following demand, which demand may be made any time after
September 15, 1997, as specified in the Note) and shall bear interest at the
rate of 11 percent per annum, payable monthly commencing on the date that is one
month following the Closing Date. Buyer's obligations under the Note will be
secured by a first priority pledge of all of the outstanding capital stock of
the Network Surviving Corporation and the Mobile Surviving Corporation (each as
defined herein) and of a newly formed, wholly owned subsidiary of Buyer to be
named "Crown Communication, Inc." ("CAC III"), which will, as of the Closing
                                    -------
Date, hold all of the Crown Communications Assets (other than the Section 1.6
Assets), and will assume all of the Assumed Liabilities (other than any Assumed
Contracts or other liabilities and obligations relating to or arising out of the
Section 1.6 Assets). Buyer and Sellers agree to allocate the Purchase Price,
together with the value of the Assumed Liabilities, as provided in Section 13.9.
Sellers shall deliver to Buyer as soon as practicable after the execution of
this Agreement, an estimate of the Tax Amount, and shall certify the Tax Amount
to Buyer on the Closing Date, which certificate shall include a reasonably
detailed calculation of the Tax Amount.


     1.5. Certain Definitions. For the avoidance of doubt, the Crown
          -------------------
Communications Business shall not include the capital stock, business, assets or
liabilities of Network or Mobile. For all purposes of this Agreement, the Crown
Communications Assets, the Assumed Liabilities and the capital stock, business,
assets and liabilities of Network and Mobile are referred to herein as the
"Acquired Business."
 -----------------

                                      -7-
<PAGE>
 
     1.6. Transfer of Section 1.6 Assets.
          ------------------------------ 

          (a)  Sellers have advised Buyer that certain assets and properties
relating to the towers listed on Schedule 1.6 (individually, a "Schedule 1.6
                                                                ------------
Tower" and, collectively, the "Schedule 1.6 Towers") are currently subject to
- -----                          -------------------
rights of first refusal in favor of BANM and BellSouth (each as defined herein).
Such assets and properties shall initially be retained by Sellers, subject to
the provisions of this Section 1.6.

          (b)  On or as promptly as practicable (and in any event within two
business days) after the earlier to occur of (i) the date that is 45 days after
the date on which Sellers shall have given notice (the "BANM Notice") under
                                                        -----------
Section 17 of the Bell Atlantic Agreement (as defined below) of the receipt by
Sellers of a definitive offer to acquire the Bell Atlantic Property (as defined
below) and (ii) the date on which Cellco Partnership, d/b/a Bell Atlantic/NYNEX
Mobile, Pittsburgh SMSA, L.P. and Pennsylvania RSA 6(II), L.P. (individually and
collectively, "BANM") notifies Sellers that it has elected not to exercise its
               ----
right of first refusal in accordance with Section 17 of the Master Tower Lease
Agreement dated as of December 29, 1995, among Robert A. Crown, d/b/a Crown
Communications and BANM (the "Bell Atlantic Agreement") with respect to any
                              -----------------------
"Property" (such term, as defined in the Bell Atlantic Agreement, being referred
to herein collectively as the "Bell Atlantic Property"), Sellers shall grant,
                               ----------------------
convey, sell, assign, transfer and deliver to Buyer, and Buyer shall purchase,
free and clear of all Liens except Crown Permitted Liens and Crown Permitted
Real Estate Liens, (A) in the case of clause (i), all of the Bell Atlantic
Property that has not been transferred to Buyer prior to such date, other than
any of the Bell Atlantic Property with respect to which BANM shall have
exercised such right of first refusal and, in the case of clause (ii), all Bell
Atlantic Property with respect to which Sellers shall have been so notified, and
(B) the Bell Atlantic Agreement and all other Contracts listed on Schedule 1.6
relating to the Bell Atlantic Property. Sellers shall promptly notify Buyer of
any notice received by Sellers that BANM has elected to exercise its right of
first refusal (or that BANM has elected not to exercise such right of first
refusal) with respect to any of the Bell Atlantic Property. Sellers shall
furnish the BANM Notice to BANM as promptly as practicable and, in any event
within ten days, after the Closing Date, and shall also keep Buyer informed on a
timely basis of all discussions with BANM regarding such right of first refusal.

          (c)  On or as promptly as practicable (and in any event within two
business days) after the earlier to occur of (i) August 29, 1997 and (ii) the
date on which BellSouth Mobility, Inc. ("BellSouth") notifies Sellers that it
                                         ---------
has elected not to exercise its right of first refusal in accordance with
Section 19 of the Option to Purchase Real Property and Perpetual Easements and
Right of First Refusal dated as of September 22, 1992 between BellSouth and
Robert A. Crown, d/b/a Crown Communications, and Barbara Crown (collectively,
the "BellSouth Agreement") with respect to the tower or any other portion of the
     -------------------
real property described in the BellSouth Agreement (collectively, the "BellSouth
                                                                       ---------
Property"), Sellers shall grant, convey, sell, assign, transfer and deliver to
- --------
Buyer, and Buyer shall purchase, free and clear of all Liens except Crown
Permitted Liens and Crown Permitted Real Estate Liens, (A) in the case of clause
(i) all of the BellSouth Property that has not been transferred to Buyer prior
to such date, other than any of the BellSouth Property with respect to which
BellSouth has exercised such right of first refusal and, in the case of clause
(ii), all of the BellSouth Property with respect to which Sellers have been so
notified, and (B) the BellSouth Agreement and all other Contracts listed on

                                      -8-
<PAGE>
 
Schedule 1.6 relating to the BellSouth Property. Sellers shall promptly notify
Buyer of any notice received by Sellers that BellSouth has elected to exercise
such right of first refusal (or that BellSouth has elected not to exercise such
right of first refusal) with respect to any of the BellSouth Property. Sellers
shall keep Buyer informed on a timely basis of all discussions with BellSouth
regarding such right of first refusal.

          (d)  The Bell Atlantic Property, the BellSouth Property, the Bell
Atlantic Agreement, the BellSouth Agreement, and the other Contracts listed on
Schedule 1.6 are referred to herein individually as a "Section 1.6 Asset" and
                                                       -----------------
collectively as the "Section 1.6 Assets". Until the earlier to occur of (i) such
                     ------------------
time as any Section 1.6 Assets are transferred to Buyer in accordance with this
Section 1.6 and (ii) if BANM or BellSouth, as the case may be, elects to
exercise its right of first refusal with respect to any such Section 1.6 Assets,
the date on which such Section 1.6 Assets are transferred to BANM or BellSouth,
as applicable, Sellers shall operate, or cause to be operated, the Section 1.6
Assets in the ordinary course of business consistent with the past practice and,
without limiting the foregoing, Sellers shall use reasonable commercial efforts
to (i) preserve their relationships with BANM, BellSouth and the other
contracting parties to the Contracts listed on Schedule 1.6 and their current
material relationships with others whom the Sellers have a material business or
financial relationship relating to the Section 1.6 Assets and (ii) maintain the
books and records relating to the Section 1.6 Assets in substantially the same
manner as presently maintained, provided further, and not in limitation of the
                                -------- -------
foregoing, Sellers agree not to (A) create or assume any Lien on any of the
Section 1.6 Assets other than Crown Permitted Liens, Crown Permitted Real Estate
Liens and Liens incurred in the ordinary course of business consistent with past
practice, (B) agree to any modification, amendment, waiver, assignment,
termination or relinquishment of any Contract, License or other right relating
to the Section 1.6 Assets, (C) fail to make any material capital expenditures
necessary to maintain the Section 1.6 Assets, (D) make or change any Tax
election, change any annual Tax accounting period, adopt or change any method of
Tax accounting, file any amended return, enter into any closing agreement,
settle any Tax claim or assessment, surrender any right to claim a Tax refund,
fail to make any Tax payments or consent to extend or waive the limitations
period applicable to any Tax claim or assessment, in each case with respect to
any Section 1.6 Asset or (E) agree in writing or otherwise to take any of the
actions prohibited by this Section 1.6(d).

          (e)  Upon transfer of any Section 1.6 Asset to Buyer in accordance
with this Section 1.6, (i) Sellers shall pay to Buyer an amount in cash equal to
the net cash flow (as defined below) of Sellers attributable to ownership and
operation of such Section 1.6 Assets from the Closing Date to the date of such
transfer; (ii) the principal amount of the Note shall be increased in accordance
with its terms by an amount equal to the sum of the principal amounts designated
on Schedule 1.6 as the cash purchase price attributable to such Section 1.6
Assets (the amount of any such increase with respect to such transfer, an
"Incremental Amount"); and (iii) Buyer shall issue and deliver to Sellers that
 ------------------
number of shares of Castle B Common Stock designated on Schedule 1.6 with
respect to the applicable Section 1.6 Assets. For purposes of this Section
1.6(e), "net cash flow" of Sellers attributable to ownership and operation of
any Section 1.6 Asset during the period from the Closing Date to the date of
transfer of such Section 1.6 Asset to Buyer shall mean all cash and other
proceeds received by Sellers in respect of such Section 1.6 Asset during such
period less any out-of-pocket expenses paid by Sellers in compliance with any of
their 

                                      -9-
<PAGE>
 
obligations under any Contract or other binding obligation applicable to such
Section 1.6 Asset during such period; provided that net cash flow shall not
                                      --------
include any Taxes attributable to the Section 1.6 Assets during such period
which the parties agree shall be the responsibility of Sellers.

          (f)  At such time as any Section 1.6 Asset is transferred to Buyer in
accordance with this Section 1.6, such Section 1.6 Asset shall, for all purposes
hereunder, be included among the Crown Communications Assets.

          (g)  If (i) BANM exercises its right of first refusal with respect to
any Bell Atlantic Property or (ii) BellSouth exercises its right of first
refusal with respect to any BellSouth Property, Sellers shall be entitled to
complete the sale of the relevant Section 1.6 Asset to BANM or BellSouth, as the
case may be, and retain all proceeds of such sale, and Buyer shall not receive
any of such proceeds. Not less than two business days prior to the date of
transfer of any Section 1.6 Asset to BANM or BellSouth upon the exercise by BANM
or BellSouth, as applicable, of its right of first refusal, Sellers shall notify
Buyer in writing of all amounts received or to be received from BANM or
BellSouth, as applicable, upon exercise of its right of first refusal with
respect to such Section 1.6 Asset. If the aggregate of such amounts is less than
the aggregate value designated on Schedule 1.6 with respect to such Section 1.6
Asset and if Buyer shall have consented to the sale of such Section 1.6 Assets
to BANM or BellSouth, as applicable, for such lesser amounts, then effective on
and as of the date of transfer of Section 1.6 Asset to BANM or BellSouth, as
applicable, the principal amount of the Note shall be increased by the amount of
such deficiency (the amount of any such increase with respect to such
deficiency, a "Compensating Incremental Amount"). Unless Sellers transfer the
               -------------------------------
Section 1.6 Assets to Buyer in accordance with this Section 1.6, Sellers shall
be entitled to retain all net cash flow attributable to the ownership and
operation of the Section 1.6 Assets, and Buyer shall not receive any of such
profits.

          (h)  So long as the Note is outstanding, any Section 1.6 Assets
purchased by Buyer pursuant to this Section 1.6 shall be held by CAC III, unless
otherwise agreed in writing by Sellers.

     1.7. Certain FCC Licenses. The parties acknowledge that Crown
          --------------------
Communications will not have received a "special temporary authorization" from
the FCC to assign and transfer the FCC Licenses listed on Schedule 1.7 to CAC
III on the Closing Date as contemplated by this Agreement. Accordingly, the
parties agree that such FCC Licenses shall be retained by Sellers until such
time as such FCC approval (which approval need not be final FCC approval) to
assign and transfer such FCC Licenses to CAC III shall have been obtained.
Promptly upon receipt (and in any event within two business days) of such FCC
approval to assign and transfer either of such FCC Licenses to CAC III, Sellers
shall assign such FCC License to CAC III, free and clear of all Liens except
Crown Permitted Liens. Until receipt of such FCC approval and assignment and
transfer of such FCC Licenses to CAC III: (i) Sellers shall make the facilities
of the stations authorized by such FCC Licenses available to CAC III on a fully
paid, exclusive basis; (ii) Sellers agree not to (a) knowingly take any action
that conflicts with or violates the terms and conditions of such FCC Licenses,
(b) create or assume any Lien on such FCC Licenses other than Crown Permitted
Liens, (c) agree to any modification, amendment, waiver, assignment, termination
or relinquishment of such FCC Licenses or any right relating thereto, or (d)
agree in writing or 

                                      -10-
<PAGE>
 
otherwise to take any of the actions prohibited by this clause (ii); and (iii)
Sellers shall cooperate with Buyer, and use commercially reasonable efforts, to
cause such FCC approval to be obtained and shall not knowingly take any action
that could result in any such FCC approval being denied.


                                  ARTICLE 2.


                            The Merger Transactions
                            -----------------------


     2.1.  The Mergers Generally.
           --------------------- 

           (a) Upon the terms and subject to the conditions set forth herein, at
the Effective Time (as defined below) (i) CAC I shall be merged with and into
Network in accordance with the Pennsylvania Business Corporation Law (the
"PBCL") and the separate corporate existence of CAC I shall thereupon cease and
 ----
(ii) CAC II shall be merged with and into Mobile in accordance with the PBCL and
the separate corporate existence of CAC II shall thereupon cease. Network and
Mobile shall be the surviving corporations in the Mergers (the "Network
                                                                -------
Surviving Corporation" and the "Mobile Surviving Corporation," respectively) 
- ---------------------           ----------------------------
and shall continue to be governed by the laws of the Commonwealth of
Pennsylvania. The Mergers shall have the effects set forth in Section 1929 of
the PBCL.

           (b) Simultaneously with the Closing, Network and Mobile will file
articles of merger with the Department of State of the Commonwealth of
Pennsylvania and make all other filings or recordings required by the PBCL in
connection with the Mergers. Each of the Mergers shall become effective at such
time as the relevant articles of merger are duly filed with the Department of
State of the Commonwealth of Pennsylvania or at such later time as is agreed by
the parties and specified in the articles of merger (the "Effective Time").
                                                          --------------

           (c) The articles of incorporation and by-laws of the Network
Surviving Corporation and the Mobile Surviving Corporation shall contain
provisions substantially identical to those of the articles of incorporation and
by-laws of CAC I and CAC II, respectively.

     2.2.  Conversion of Shares.
           -------------------- 

           (a) At the Effective Time:

               (i)    each share of common stock, no par value, of Network (the
     "Network Common Stock") held by Network as treasury stock immediately prior
     ---------------------                                                      
     to the Effective Time shall, by virtue of the Network Merger and without
     any action on the part of the holder thereof, be canceled, and no Castle
     Common Stock (as defined herein) or other consideration shall be delivered
     in exchange therefor;

               (ii)   each share of common stock, par value $1.00 per share, of
     Mobile (the "Mobile Common Stock" and, together with the Network Common
                  -------------------
     Stock, the "Crown Stock") held by Mobile as treasury stock immediately
                 -----------
     prior to the Effective Time shall, by virtue of the Mobile Merger and
     without any action on the part of the holder 

                                      -11-
<PAGE>
 
     thereof, be canceled, and no Castle Common Stock or other consideration
     shall be delivered in exchange therefor;

               (iii)  each share of common stock, par value $0.01 per share, of
     CAC I outstanding immediately prior to the Effective Time shall, by virtue
     of the Network Merger and without any action on the part of CAC I or the
     holder thereof, be converted into and become one share of common stock of
     the Network Surviving Corporation and shall constitute the only outstanding
     shares of capital stock of the Network Surviving Corporation;

               (iv)   each share of common stock, par value $0.01 per share, of
     CAC II outstanding immediately prior to the Effective Time shall, by virtue
     of the Mobile Merger and without any action on the part of CAC II or the
     holder thereof, be converted into and become one share of common stock of
     the Mobile Surviving Corporation and shall constitute the only outstanding
     shares of capital stock of the Mobile Surviving Corporation;

               (v)    each share of Network Common Stock outstanding immediately
     prior to the Effective Time shall, by virtue of the Network Merger and
     without any action on the part of the holder thereof, except as otherwise
     provided in Section 2.2(a)(i), be converted into the right to receive the
     number of fully paid and nonassessable shares of Castle B Common Stock
     equal to the Network Merger Consideration (as defined herein); and

               (vi)   each share of Mobile Common Stock outstanding immediately
     prior to the Effective Time shall, by virtue of the Mobile Merger and
     without any action on the part of the holder thereof, except as otherwise
     provided in Section 2.2(a)(ii), be converted into the right to receive the
     number of fully paid and nonassessable shares of Castle B Common Stock
     equal to the Mobile Merger Consideration (as defined herein).

        (b)    From and after the Effective Time, all shares of Crown Stock
converted in accordance with Section 2.2(a)(v) or (vi) shall no longer be
outstanding and shall, by virtue of the Mergers and without any action on the
part of the holder thereof, automatically be canceled and retired and shall
cease to exist, and each holder of a certificate representing any such shares
shall cease to have any rights with respect thereto, except the right to receive
the applicable Merger Consideration (as defined herein) and any dividends
payable pursuant to Section 2.3(d). From and after the Effective Time, all
certificates representing the common stock of CAC I or CAC II shall be deemed
for all purposes to represent the number of shares of common stock of the
Network Surviving Corporation or the Mobile Surviving Corporation, as the case
may be, into which they were converted in accordance with Section 2.1(a)(iii) or
(iv).

        (c)    The "Network Merger Consideration" shall be 701,000 shares of
                    ----------------------------
Castle B Common Stock per outstanding share of Network Common Stock, and the
"Mobile Merger Consideration" shall be 38,000 shares of Castle B Common Stock
 ---------------------------
per outstanding share of Mobile Common Stock (the Mobile Merger Consideration,
together with the Network Merger 

                                      -12-
<PAGE>
 
Consideration, the "Merger Consideration") which the parties agree represents an
                    --------------------
aggregate value of $54,000,000.


     2.3.  Surrender and Payment.
           --------------------- 

           (a)  At the Closing, Buyer shall cause the issuance of the Merger
Consideration to the Sellers upon proper delivery of the outstanding Crown
Stock. Buyer and Sellers contemplate that the exchange of Merger Consideration
for certificates of Crown Stock will occur at the Closing.

           (b)  Upon surrender to the Buyer of a certificate or certificates
representing shares of the Network Common Stock or the Mobile Common Stock, the
Crowns will be entitled to receive the Merger Consideration payable in respect
of such shares and any dividends payable pursuant to Section 2.3(d). Until so
surrendered, each such certificate shall, after the Effective Time, represent
for all purposes only the right to receive the Network Merger Consideration or
the Mobile Merger Consideration, as applicable, and any dividends payable
pursuant to Section 2.3(d).

           (c) After the Effective Time, there shall be no further registration
of transfers of shares of Crown Stock. If, after the Effective Time,
certificates representing such shares are presented to Network Surviving
Corporation or Mobile Surviving Corporation, they shall be canceled and
exchanged for the consideration provided for, and in accordance with the
procedures set forth, in this Article 2.

           (d) No dividends or other distributions with respect to Castle B
Common Stock issued in the Mergers shall be paid to the holders of any
unsurrendered certificates representing shares of Crown Stock until such
certificates are surrendered as provided in this Section 2.3. Subject to the
effect of applicable laws, following the surrender of such certificates, there
shall be paid, without interest, to the record holder of the Castle B Common
Stock issued in exchange therefor at the time of such surrender, the amount of
dividends or distributions with a record date after the Effective Date payable
with respect to such whole shares of Castle B Common Stock prior to or on the
date of such surrender and not previously paid, less the amount of any
withholding taxes which may be required thereon.


                                  ARTICLE 3.

                          Due Diligence Investigation
                          ---------------------------


     3.1.  Due Diligence Investigation Generally. From July 11, 1997 through and
           -------------------------------------
including August 4, 1997 (the "Due Diligence Completion Date"), Sellers, on the
                               -----------------------------
one part, and the Buyer, on the other part, each shall have the opportunity to
conduct a due diligence investigation of the business, assets, operations,
properties, condition (financial and otherwise), contingent liabilities,
prospects and material agreements of Buyer and its Subsidiaries and CTSH and its
Subsidiaries (in the case of Sellers) and of the Crown Communications Business,
Network and Mobile (in the case of Buyer) for the limited purposes of: (a) in
the case of Sellers, (i) confirming the accuracy, in all material respects, of
the Buyer's representations and warranties provided in Article 6, and (ii)
confirming the 1998 projections of earnings before interest, taxes, depreciation
and amortization 

                                      -13-
<PAGE>
 
("EBITDA") of Buyer and its Subsidiaries and CTSH and its Subsidiaries set forth
  ------
in Exhibit C, within the parameters described below; and (b) in the case of
Buyer, (i) confirming the accuracy, in all material respects, of the Crown
Parties' representations and warranties provided in Article 5, (ii) confirming
the 1998 projections of EBITDA for the Acquired Business set forth on Exhibit D,
within the parameters described below, and confirming that the amount of
indebtedness for borrowed money that is needed to generate such projected EBITDA
does not exceed $25 million, (iii) determining, in good faith, that Buyer is
reasonably satisfied in all material respects with the terms of all Contracts,
Licenses and title to assets and properties of the Acquired Business, taken as a
whole, including without limitation the assignability or risks associated with
being unable to obtain consents to assignment of any of the Contracts, Licenses
or other properties or assets of the Crown Communications Business, Mobile or
Network (including any of the Contracts, Licenses or other properties or assets
identified in the Sellers' disclosure schedules as containing restrictions on,
or resulting in other adverse consequences upon, the transfer or assignment of
such Contracts, Licenses or other properties or assets), and (iv) determining,
in good faith, that Buyer is reasonably satisfied in all material respects with
all environmental conditions affecting or relating to the Acquired Business and
the business and operations thereof and the status of compliance by the Acquired
Business with all Environmental Laws (as defined herein). For purposes of
clauses (a)(ii) and (b)(ii) of this Section 3.1, such projected 1998 EBITDA will
be deemed to have been confirmed if the Sellers or Buyer, as the case may be,
determine(s), based upon such due diligence, that the projected 1998 EBITDA
numbers of the other party are at least equal to ninety percent (90%) of the
amount of EBITDA projected for such other party set forth on Exhibit C or D,
respectively. In furtherance of the foregoing, each party shall comply at all
times during the period from July 11, 1997 through and including the Closing
Date with its respective obligations under Section 9.3.


     3.2.  Interim Financial Statements.
           ---------------------------- 

           (a) Sellers shall deliver to Buyer on or prior to July 18, 1997 the
unaudited balance sheets of each of Crown Communications, Network and Mobile as
of June 30, 1997, and the unaudited statements of income and cash flow of each
of Crown Communications, Network and Mobile for the six months then ended,
together with the notes to such interim financial statements (collectively, the
"Crown Interim Financial Statements").
 ----------------------------------   

           (b) Buyer shall deliver to Sellers on or prior to July 18, 1997 (i)
the unaudited balance sheet of Buyer and its consolidated Subsidiaries as of
June 30, 1997, and the statements of income and cash flow of Buyer and its
subsidiaries for the six months then ended together with the notes to such
interim financial statements (collectively, the "Buyer Interim Financial
                                                 -----------------------
Statements"), and (ii) the unaudited balance sheet of CTSH and its consolidated
- ----------
Subsidiaries as of June 30, 1997, and the unaudited profit and loss account and
cash flow statement of CTSH and its Subsidiaries for the three months then ended
together with the notes to such interim financial statements (collectively, the
"CTSH Interim Financial Statements").
 ---------------------------------   

                                      -14-
<PAGE>
 
                                   ARTICLE 4.


                 Closing; Deliveries of the Parties at Closing
                 ---------------------------------------------


     4.1.  The Closing.
           ----------- 

           (a)   The consummation of the transactions provided for in this
Agreement, which shall be deemed to occur at the Effective Time (the "Closing"),
                                                                      -------
and shall take place at the offices of Kirkpatrick & Lockhart LLP, 1500 Oliver
Building, Pittsburgh, PA 15222 at 10:00 A.M. on August 15, 1997 or, if the
conditions to Closing set forth in Articles 10 and 11 shall not have been
satisfied by such date, as soon as practicable after such conditions have been
satisfied. The date on which the Closing shall occur is referred to herein as
the "Closing Date."
     ------------

     4.2.  Deliveries at the Closing by the Crown Parties.  At the Closing, 
           ---------------------------------------------- 
Sellers shall deliver to Buyer, CAC I, CAC II and CAC III:

           (a)   bills of sale, endorsements, assignments, certificates of title
and other good and sufficient instruments of sale, transfer and assignment in
form and substance reasonably satisfactory to Buyer and its counsel sufficient
to sell, transfer and assign to Buyer (or, if so instructed by Buyer, to CAC
III) all right, title and interest of Seller in and good and valid title to the
Crown Communications Assets (other than Real Property owned by Sellers covered
by (b) below), subject to Crown Permitted Liens;

           (b)   one or more special warranty deeds with covenant against
grantor's acts (or an equivalent form of deed suitable for recordation in the
relevant jurisdictions), in form and substance reasonably satisfactory to Buyer
and its counsel, but subject to all Crown Permitted Real Estate Liens,
sufficient to sell, transfer and assign to Buyer (or if so instructed by Buyer,
to CAC III) all Real Property owned by Sellers and included within the Crown
Communications Assets;

           (c)   certified copies of resolutions, duly adopted by the Boards of
Directors and shareholders of Network and Mobile, which shall be in full force
and effect at the time of the Closing, authorizing the execution, delivery and
performance by Sellers of this Agreement and the consummation of the
transactions contemplated hereby and any other authorization required for the
sole proprietorship to transfer the Crown Communications Assets;

           (d)   a certificate from each of the Crown Parties signed by such
party or an executive officer of such party, as applicable, to the effect set
forth in clauses (a) and (b) of Section 11.1;

           (e)   an opinion dated as of the Closing Date of Kirkpatrick &
Lockhart LLP, counsel to Seller, with respect to such matters as Buyer may
reasonably request in form and substance reasonably satisfactory to Buyer;

                                      -15-
<PAGE>
 
           (f)   executed counterparts to the Amended and Restated Stockholders
Agreement executed by each of the Sellers, substantially in the form set forth
as Exhibit E (the "Shareholder Agreement");
                   ---------------------   

           (g)   such other documents or instruments as Buyer or its counsel may
reasonably request (i) to demonstrate satisfaction of the conditions to Closing
set forth in Article 11 and compliance by the Crown Parties with the agreements
set forth in this Agreement and (ii) for purposes of the issuance of Buyer's
owner's title insurance policy with respect to all Real Property to be acquired
without deletion of the standard exceptions to title (such instruments referred
to in clause (a) above, deeds referred to in clause (b) above, the Shareholder
Agreement referred to in clause (f) above and this Agreement, collectively, the
"Crown Transaction Documents");
 ---------------------------   

           (h)   executed counterparts to the FCC Letter Agreement executed by
each of the Sellers, substantially in the form set forth as Exhibit F (the "FCC
Letter Agreement");

           (i)   executed counterparts to the Crown Name Agreement executed by
each of the Crowns, substantially in the form set forth as Exhibit G (the "Crown
Name Agreement");

           (j)   an Amended and Restated Credit Agreement between CAC III, as
the Borrower, and PNC Bank, National Association, as the Bank (the "Amended and
Restated Credit Agreement"), and the additional loan documentation referred to
therein, in form and substance reasonably satisfactory to Buyer and its counsel;
and

           (k)   executed counterparts to the Tower Agreement, executed by each
of the Crowns, substantially in the form of Exhibit H (the "Tower Agreement").


     4.3.  Deliveries at the Closing by Buyer.  At the Closing, Buyer, CAC I,
           ---------------------------------- 
CAC II or CAC III shall deliver to the Crown Parties:

           (a)   the Purchase Price for the Crown Communications Assets,
consisting of the Cash Consideration (less the amount of the Advance Payment)
and the Note, in accordance with Section 1.4 hereof;

           (b)   executed counterparts of a pledge agreement securing Buyer's
obligations under the Note, together with the certificates representing all the
capital stock in CAC III, the Network Surviving Corporation and the Mobile
Surviving Corporation and stock powers for each executed in blank necessary to
perfect Sellers' security interests referred to in Section 1.4(b), in each case
in form and substance reasonably satisfactory to Sellers and their counsel;

           (c)   an instrument or instruments of assumption of the Assumed
Liabilities of the Sellers' responsibilities therefor, in each case in form and
substance reasonably satisfactory to Sellers and their counsel;

           (d)   certified copies of resolutions, duly adopted by the Boards of
Directors of Buyer, CAC I and CAC II which shall be in full force and effect at
the time of the Closing, 

                                      -16-
<PAGE>
 
authorizing the execution, delivery and performance by Buyer, CAC I and CAC II
of this Agreement and the consummation of the transactions contemplated hereby;

           (e)   upon proper delivery of the Crown Stock, the Merger
Consideration in connection with the Mergers;

           (f)   a certificate from each of Buyer, CAC I and CAC II signed by an
executive officer of such party to the effect set forth in clauses (a) and (b)
of Section 10.1;

           (g)   (i) an opinion of Cravath, Swaine & Moore, counsel to Buyer,
(ii) an opinion of Brown, Parker & Leahy, counsel to Buyer, and (iii) an opinion
of Buchanan Ingersoll Professional Corporation, counsel to Buyer, in each case
dated as of the Closing Date with respect to such matters as Sellers may
reasonably request in form and substance reasonably satisfactory to Sellers;

           (h)   executed counterparts to the Shareholder Agreement, executed by
all parties thereto other than the Sellers;

           (i)   articles of merger to effect the Mergers as contemplated by
Section 2.1;

           (j)   a letter agreement from Lehman Brothers and Buyer in favor of
Sellers confirming the continuing status of Buyer's committed financing and
stating that Buyer and Lehman Brothers each will provide written notice to
Sellers not less than ten (10) days prior to the scheduled termination of such
financing commitment, or prior to any termination effected by such party, such
letter to be in form and substance reasonably satisfactory to Sellers and their
counsel;

           (k)   such other documents or instruments as the Crown Parties or
their counsel may reasonably request to demonstrate satisfaction of the
conditions to Closing as set forth in Article 10 and compliance by Buyer with
the agreements set forth in this Agreement (the Note referred to in clause (a)
above, the instruments referred to in clauses (b) and (c) above, the Shareholder
Agreement referred to in clause (h) above, and this Agreement, collectively, the
"Buyer Transaction Documents");
 ---------------------------

           (l)   executed counterparts to the FCC Letter Agreement executed by
all parties thereto other than the Sellers;

           (m)   executed counterparts to the Crown Name Agreement executed by
Buyer; 
     
           (n)   executed counterparts of the Amended and Restated Credit
Agreement and additional loan documentation referred to therein, executed by 
CAC III; and

           (o)   executed counterparts of the Tower Agreement, executed by 
CAC III.

                                      -17-
<PAGE>
 
     4.4.  Time is of the Essence.  With regard to all dates and time periods
           ---------------------- 
set forth or referred to in this Agreement, time is of the essence.


                                   ARTICLE 5


              Representations and Warranties of the Crown Parties
              ---------------------------------------------------


     Each of the Crown Parties represents and warrants to Buyer, jointly and
severally, as follows:


     5.1.  Corporate Status; Authority.  Each of Network and Mobile is a
           --------------------------- 
corporation duly organized, validly existing and in good standing under the laws
of the Commonwealth of Pennsylvania. Each of Network and Mobile is duly
qualified and in good standing to do business as a foreign corporation and the
Crown Communications Business is duly qualified and in good standing to do
business in each jurisdiction in which the conduct or nature of its business or
the ownership, leasing or holding of its properties makes such qualification
necessary, except such jurisdictions where the failure to be so qualified or in
good standing, individually or in the aggregate, would not reasonably be
expected to have a material adverse effect (i) on the condition (financial or
otherwise), business, liabilities, properties, assets, prospects or results of
operations of the Acquired Business, taken as a whole, or (ii) on the ability of
the Crown Parties to perform their obligations under or to consummate the
transactions contemplated by this Agreement (a "Crown Material Adverse Effect").
                                                -----------------------------
Each of Network and Mobile has all requisite corporate power, and the Crown
Communications Business has all requisite power, to carry on its business and
operations as it is now being conducted and to own and operate such business, to
enter into this Agreement, to perform its obligations hereunder and to complete
the transactions contemplated hereby.

     5.2.  Corporate Action.  All corporate and shareholder actions and
           ---------------- 
proceedings necessary to be taken by or on the part of each of Network and
Mobile in connection with the transactions contemplated by the Crown Transaction
Documents have been duly and validly taken, and this Agreement has been duly and
validly authorized, executed and delivered by each of Network and Mobile and
constitutes, and each of the other Crown Transaction Documents, as applicable,
will be duly and validly authorized, executed and delivered by each of Network
and Mobile and will constitute, the legal, valid and binding obligation of each
of Network and Mobile, enforceable against each of Network and Mobile in
accordance with and subject to its terms, except as may be limited by bankruptcy
or other laws affecting creditors' rights and by equitable principles.

     5.3   Authority; Execution.  Each of the Sellers has all requisite power
           -------------------- 
and authority to execute and deliver the Crown Transaction Documents and to
consummate the transactions contemplated thereby. All acts and other proceedings
required to be taken by the Sellers to authorize the execution, delivery and
performance of the Crown Transaction Documents and the consummation of the
transactions contemplated thereby have been duly and properly taken. This
Agreement has been duly executed and delivered by each seller and constitutes, 
and each of the other Crown Transaction Documents, as applicable, will be duly 
executed and delivered by each

                                      -18-
<PAGE>
 
Seller and will constitute, a legal, valid and binding obligation of such
Seller, enforceable against such Seller in accordance with and subject to its
terms, except as may be limited by bankruptcy or other laws affecting creditors'
rights and by equitable principles.

     5.4   No Conflicts.  Except as set forth on Schedule 5.4, neither the
           ------------ 
execution, delivery and performance by the Crown Parties, as applicable, of the
Crown Transaction Documents nor the consummation by the Crown Parties of the
transactions contemplated thereby is an event that, by itself or with the giving
of notice or the passage of time or both, will (i) conflict with the articles of
incorporation or by-laws, as amended, of either Network or Mobile, (ii)
constitute a violation of, or conflict with or result in any breach of or any
default under, or constitute grounds for termination or acceleration of, any
License, mortgage, indenture, lease, contract, agreement or instrument to which
any of the Crown parties or the Acquired Business is a party or by which any of
them is bound, except for such violations, conflicts, breaches, terminations and
accelerations as individually or in the aggregate would not have or be
reasonably expected to have a Crown Material Adverse Effect or result in the
creation of any Lien (other than a Permitted Lien (as defined herein)) upon any
of the assets of the Acquired Business or (iii) violate (A) any judgment, decree
or order or (B) any statute, rule or regulation, in each such case, applicable
to any of the Crown Parties or the Acquired Business. The execution, delivery
and performance by the Crown Parties of this Agreement, and the consummation by
the Crown Parties of the transactions contemplated hereby, require no action by
or in respect of, or filing with, any Governmental Entity other than (a) the
filing of articles of merger with the Department of State of the Commonwealth of
Pennsylvania and of appropriate documentation with the relevant authorities of
other states in which Network or Mobile or the Crown Communications Business is
qualified to do business; (b) compliance with any applicable requirements of the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the "Hart-
                                                                       ----
Scott-Rodino Act"); (c) the approvals of the FCC contemplated by this Agreement;
- ----------------                                                                
(d) actions or filings which, if not taken or made, would not, individually or
in the aggregate, reasonably be expected to have a Crown Material Adverse
Effect; and (e) filings and notices not required to be made or given until after
the Effective Time.

     5.5   Capitalization of Network.  The authorized capital stock of Network
           ------------------------- 
consists of 100,000 shares of Common Stock, no par, of which two shares are duly
authorized and validly issued and outstanding, fully paid and nonassessable (the
"Network Shares"). Robert A. Crown is the record and beneficial owner of one
 --------------
Network Share and Barbara Crown is the record and beneficial owner of one
Network Share. Except for the Network Shares, there are no shares of capital
stock or other equity securities of Network outstanding. The Network Shares have
not been issued in violation of, and the Network Shares are not subject to, any
purchase option, call, right of first refusal, preemptive, subscription or
similar rights under any provision of applicable law, the Network articles of
incorporation or by-laws, as amended, any Contract to which Network or Sellers
are subject, bound or a party or otherwise. There are no outstanding warrants,
options, rights, "phantom" stock rights, agreements, convertible or exchangeable
securities or other commitments (other than this Agreement) (a) pursuant to
which any of the Sellers or Network is or may become obligated to issue, sell,
purchase, return or redeem any shares of capital stock or other securities of
Network or (b) that give any Person the right to receive any benefits or rights
similar to any rights enjoyed by or accruing to the Crowns as holders of the
Network Shares. There are no equity securities of Network reserved for issuance
for any 

                                      -19-
<PAGE>
 
purpose. There are no outstanding bonds, debentures, notes or other securities
having the right to vote on any matters on which stockholders of Network may
vote.

     5.6.  Capitalization of Mobile.  The authorized capital stock of Mobile
           ------------------------ 
consists of 1,000 shares of Common Stock, par value $1.00 per share, of which
one share is duly authorized and validly issued and outstanding, fully paid and
nonassessable (the "Mobile Share").  Robert A. Crown is the record and 
                    ------------
beneficial owner of 1 Mobile Share. Except for the Mobile Share, there are no
shares of capital stock or other equity securities of Mobile outstanding. The
Mobile Share has not been issued in violation of, and the Mobile Share is not
subject to, any purchase option, call, right of first refusal, preemptive,
subscription or similar rights under any provision of applicable law, the Mobile
articles of incorporation or by-laws, as amended, any Contract to which Mobile
or Sellers are subject, bound or a party or otherwise. There are no outstanding
warrants, options, rights, "phantom" stock rights, agreements, convertible or
exchangeable securities or other commitments (other than this Agreement) (a)
pursuant to which any of the Sellers or Mobile is or may become obligated to
issue, sell, purchase, return or redeem any shares of capital stock or other
securities of Mobile or (b) that give any Person the right to receive any
benefits or rights similar to any rights enjoyed by or accruing to Robert A.
Crown as holder of the Mobile Share. There are no equity securities of Mobile
reserved for issuance for any purpose. There are no outstanding bonds,
debentures, notes or other securities having the right to vote on any matters on
which stockholders of Mobile may vote.

     5.7.  Equity Interests.  Except as set forth on Schedule 5.7, neither
           ---------------- 
Network nor Mobile owns, nor do the Crown Communications Assets include,
directly or indirectly, any capital stock of or other equity interests in any
corporation, partnership, limited liability company, limited liability
partnership or other Person and neither Network, Mobile nor Crown Communications
is a member of or participant in any partnership, joint venture, limited
liability company, limited liability partnership or similar Person. Other than
the Crown Stock, Sellers do not own capital stock of or other equity interests
in any corporation, partnership, limited liability company, limited liability
partnership or other Person that is related to or involved in the conduct or
operation of the Crown Communications Business or the business of Network or
Mobile or any similar or related business or operations.

     5.8.  Title to the Crown Stock.  The Crowns have good and valid title to
           ------------------------ 
the Network Shares and the Mobile Share, free and clear of any Liens. Assuming
Buyer has the requisite power and authority to be the lawful owner of the Crown
Stock, upon delivery to Buyer at the Closing of certificates representing the
Crown Stock, duly endorsed by Sellers for transfer to Buyer, and upon Sellers'
receipt of the Merger Consideration with respect to such shares, good and valid
title to the Crown Stock will pass to Buyer, free and clear of any Liens, other
than those arising from acts of Buyer or its Affiliates (including, without
limitation, the pledge of capital stock in favor of Sellers referred to in
Section 1.4(b)). Other than this Agreement, the Crown Stock is not subject to
any voting trust agreement or other contract, agreement, arrangement, commitment
or understanding restricting or otherwise relating to the voting, dividend
rights or disposition of the Crown Stock.

     5.9   Financial Statements.  Schedule 5.9 sets forth true, correct and
           -------------------- 
complete copies of (a) the balance sheets of each of Crown Communications,
Network and Mobile as at December 

                                      -20-
<PAGE>
 
31, 1995 and 1996, and the statements of income and cash flows of each of Crown
Communications, Network and Mobile for each of the years then ended together
with the notes to such financial statements and, in the case of Crown
Communications, the reports thereon of Peter M. Habib & Associates, independent
certified public accountants (with respect to Crown Communications, the "Crown
                                                                         -----
Audited Statements" and, with respect to Network and Mobile, the "Crown
- ------------------                                                -----
Unaudited Statements"); and (b) the balance sheets of each of Crown
- --------------------                                               
Communications, Network and Mobile as at May 31, 1997 and the statements of
income and cash flows of each of Crown Communications, Network and Mobile for
the five months then ended (together with the Crown Audited Statements, the
Crown Unaudited Statements and the Crown Interim Financial Statements, the
                                                                          
"Crown Financial Statements").  The Crown Financial Statements have been, or in
- ---------------------------                                                    
the case of the Crown Interim Financial Statements, will be, prepared from the
books and records of the Crown Parties and present fairly (subject, in the case
of the Crown Interim Financial Statements, to normal recurring year-end
adjustments) the financial position of the Crown Communications Business,
Network or Mobile, as applicable, as at December 31, 1995 and 1996, May 31, 1997
and June 30, 1997 and the statements of income and cash flows of the Crown
Communications Business, Network or Mobile, as applicable, for the periods then
ended in conformity with generally accepted accounting principles ("GAAP")
                                                                    ----  
applied on a basis consistent with past practice, except in each case as
described in the notes thereto or as otherwise disclosed in Schedule 5.9.

     5.10  No Undisclosed Liabilities.
           -------------------------- 

           (a)   There have been no material liabilities or obligations (whether
pursuant to Contracts or otherwise) of any kind whatsoever (whether accrued,
contingent, absolute, determined, determinable or otherwise) incurred by the
Crown Communications Business, Network or Mobile since December 31, 1996, other
than:

                 (i)   liabilities or obligations disclosed or provided for in
     the Crown Interim Balance Sheets or in the notes thereto;

                 (ii)  liabilities or obligations incurred or that have arisen
     in the ordinary course of business consistent with past practice which,
     individually and in the aggregate, have not had and would not reasonably be
     expected to have a Crown Material Adverse Effect; or

                 (iii) liabilities or obligations under this Agreement or
     incurred in connection with the transactions contemplated hereby.

           (b)   On the Closing Date, neither Network nor Mobile will have any
material liabilities or obligations (whether pursuant to Contracts or otherwise)
of any kind whatsoever (whether accrued, contingent, absolute, determined,
determinable or otherwise) other than:

                 (i)   trade payables and other accounts payable reflected on
     the balance sheets as of June 30, 1997 of Network and Mobile respectively,
     and those arising thereafter in the ordinary course of business consistent
     with past practice; and

                                      -21-
<PAGE>
 
                 (ii)  liabilities or obligations under the Sellers Scheduled
     Contracts (as defined herein).

     5.11  Absence of Certain Changes or Events.  Since December 31, 1996, the
           ------------------------------------ 
Crown Parties have made reasonable efforts consistent with past practice to
preserve the Crown Communications Business, Network and Mobile's relationships
with customers, suppliers, lenders, creditors, employees, licensors, licensees,
distributors and others with whom the Crown Communications Business, Network or
Mobile or any of the Crown Parties has a business or financial relationship, and
no such Person or group of persons having a material business or financial
relationship with the Crown Communications Business, Network or Mobile or any of
the Crown Parties has informed any of the Crown Parties that such Person intends
to change or discontinue such relationship, except for such changes or
discontinuances as individually or in the aggregate would not have or be
reasonably expected to have a Crown Material Adverse Effect. Except as set forth
on Schedule 5.11, the Crown Communications Business and the businesses of
Network and Mobile have been conducted in the ordinary course consistent with
past practice (including with respect to the collection of receivables, payment
of payables and other liabilities, advertising activities, sales practices
(including promotions, discounts and concessions), capital expenditures and
inventory levels, and contributions to or accruals to or in respect of Benefit
Plans (as defined herein)) and there has not occurred with respect to the Crown
Communications Business, Network or Mobile:

           (a)   any event, occurrence or development which, individually or in
the aggregate, has had or would reasonably be expected to have a Crown Material
Adverse Effect;

           (b)   any damage, destruction or loss not covered by insurance that
would reasonably be expected to have a Crown Material Adverse Effect; provided
                                                                      --------
that any such damage, destruction or loss between July 11, 1997 and the Closing
Date shall be subject to Section 7.1 and upon the Crown Parties' giving notice
to Buyer of the Crown Parties' election to repair such damage, destruction or
loss pursuant to Section 7.1, and such damage, destruction or loss being
repaired to Buyer's satisfaction, such damage, destruction or loss shall be
deemed not to be a failure of the condition set forth in Section 10.1; provided
                                                                       --------
further that the Crown Parties shall be under no obligation to elect to repair
- -------
such damage, destruction or loss; or

           (c)   any action taken by any of the Crown Parties which, if taken
after July 11, 1997, would constitute a breach of the covenant set forth in
Section 7.1.

     5.12. Licenses.  None of the Crown Parties owns, holds or uses any Licenses
           -------- 
which are material to the ownership or operation of the Acquired Business as
currently operated other than the Licenses listed on Schedule 5.12, true and
complete copies of which have been or will be made available to Buyer. Schedule
5.12 identifies the legal holders of all Licenses material to the ownership or
operation of the Acquired Business and whether they are part of the Crown
Communications Business or held by Network or Mobile. Such Licenses are valid
and are in full force and effect and, except as limited by the provisions of the
Communications Act of 1934, as amended (the "Communications Act"), and the FCC's
                                             ------------------                 
rules, regulations and policies and as otherwise specified on the face of such
Licenses, none of such Licenses is subject to any restriction or condition which
would limit in any material respect the operation of the Acquired 

                                      -22-
<PAGE>
 
Business as it is presently being conducted. The Crown Parties are familiar with
and have operated the Acquired Business (and any auxiliary assets operated in
connection with the operation of the Acquired Business) at all times in material
compliance with generally accepted industry practices and in compliance in all
material respects with the Licenses, the Communications Act and the existing
rules, regulations and policies of the FCC and the rules and regulations and
policies of the Federal Aviation Administration ("FAA"). Except as shown on
                                                  ---
Schedule 5.12, no application, action or proceeding is pending for the renewal
or modification of any of the Licenses and there is not now before any
Governmental entity any investigation or complaint against any of the Crown
Parties relating to the Acquired Business the unfavorable resolution of which
would impair the qualifications of any of the Crown Parties to hold any of the
Licenses. Except as shown on Schedule 5.12, no event or events have occurred
which, individually or in the aggregate, and with or without the giving of
notice or the lapse of time or both, would constitute grounds for, or which
could result in, the revocation or termination of any License or the imposition
of any restriction or limitation by any Governmental Entity on the operation of
the Acquired Business or the Crown Communications Business. No Licenses other
than those shown on Schedule 5.12 are necessary or required to operate the
Acquired Business as it is presently being conducted.

     5.13. Sufficiency of Assets.  Except for the Excluded Assets, the Acquired
           --------------------- 
Business constitutes, and on the Closing Date will constitute, all of the assets
or property used or held for use primarily in the Crown Communications Business
to conduct the Crown Communications Business as the same is now being conducted.
On the Closing Date, the Network Surviving Corporation will have all of the
assets or property used or held for use primarily in the business and operations
of Network to conduct such business and operations as the same is now being
conducted, and the Mobile Surviving Corporation will have all of the assets or
property used or held for use primarily in the business and operations of Mobile
to conduct such business and operations as the same is now being conducted. On
the Closing Date, the Acquired Business will have access to liquidity and will
have working capital reasonably sufficient to enable it to conduct its business
and operations, including those of Network and Mobile, as the same is now being
conducted and as proposed to be conducted after the Closing as contemplated by
the parties.


     5.14. Assets Other than Real Property Interests.
           ----------------------------------------- 

           (a)   The Crown Parties have good and valid title to all assets
reflected on the December 31, 1996 balance sheets of the Crown Communications
Business, Network and Mobile included in the Crown Financial Statements (the
"December 31 Crown Balance Sheets") or thereafter acquired, except those sold or
 --------------------------------
otherwise disposed of in the ordinary course of business consistent with past
practice and not in violation of this Agreement, in each case free and clear of
all Liens of any kind except (i) such as are set forth on Schedule 5.14, (ii)
mechanics', carriers', workmen's, repairmen's or other like Liens arising or
incurred in the ordinary course of business consistent with past practice, (iii)
Liens which secure debt that is reflected as a liability on the balance sheets
as of June 30, 1997 included in the Crown Interim Financial Statements and other
debt incurred under existing credit facilities and vehicle financings of the
Acquired Business and (iv) other imperfections of title or encumbrances, if any,
which do not, individually or in the aggregate, materially impair the continued
use and operation of the assets to which they relate in the Acquired Business,
as presently conducted (Liens, encumbrances and imperfections of title 

                                      -23-
<PAGE>
 
described in clauses (i), (ii), (iii) and (iv) above are hereinafter referred to
collectively as "Crown Permitted Liens"). Schedule 5.14 sets forth a list of all
                 ---------------------
material personal property owned by Sellers and used or held for use in
connection with the Crown Communications Business.

           (b)   All the material tangible assets used, held for use or
necessary in the Acquired Business (i) have been and are being maintained in
accordance with the customary industry practice, (ii) are free from material
defects and (iii) are in all material respects in good working condition,
reasonable wear and tear and depreciation excepted. All leased personal property
used or held for use in the Acquired Business is in all material respects in the
condition required of such property by the terms of the lease applicable thereto
during the term of the lease and upon the expiration thereof.

     This Section 5.14 does not relate to Real Property or interests in Real
Property, such items being the subject of Section 5.15.

     5.15. Title to Real Property.  Schedule 5.15 sets forth a complete list of
           ---------------------- 
all Real Property and interests in Real Property used or held for use in the
Acquired Business owned in fee by the Crown Parties (individually, a "Crown
                                                                      -----
Owned Property") and identifies any material reciprocal easement or operating
- --------------
agreements (other than such operating agreements not relating to Real Property
identified on other disclosure schedules of the Crown Parties attached hereto)
relating thereto. Schedule 5.15 sets forth a complete list of all Real Property
and interests in Real Property used or held for use in the Acquired Business
leased by the Crown Parties (individually, a "Crown Leased Property") and
                                              ---------------------
identifies any material leases and reciprocal easement or operating agreements
(other than such operating agreements not relating to Real Property identified
on other disclosure schedules of the Crown Parties attached hereto) relating
thereto. The Crown Parties have (i) good and insurable fee title to all Crown
Owned Property and (ii) assuming good and adequate title in each lessor of a
leasehold estate, good and valid title to the leasehold estates in all Crown
Leased Property (a Crown Owned Property or Crown Leased Property being sometimes
referred to herein, individually, as a "Crown Property" and, collectively, as
                                        --------------                       
"Crown Properties"), in each case free and clear of all Liens and other similar
 ----------------                                                              
restrictions of any nature whatsoever, except (A) such as are set forth on
Schedule 5.15, (B) leases, subleases and similar agreements set forth on
Schedule 5.20, (C) Crown Permitted Liens, (D) easements, covenants, rights-of-
way and other similar restrictions of record, (E) any conditions that may be
shown by a current, accurate survey or readily determined by a physical
inspection of any Crown Property made prior to Closing and (F) (I) zoning,
building and other similar restrictions, (II) Liens and other similar
restrictions that have been placed by any developer, landlord or other third
party on property over which the Crown Parties have easement rights or on any
Leased Property and subordination or similar agreements relating thereto, and
(III) unrecorded easements, covenants, rights-of-way and other similar
restrictions, none of which items set forth in clauses (I), (II) and (III),
individually or in the aggregate, materially impair the continued use and
operation of the property to which they relate in the Crown Communications
Business, as presently conducted.  Except as disclosed on Schedule 5.18, to the
knowledge of the Crown Parties, the current use by the Crown Parties of the
plants, offices and other facilities located on Crown Property does not violate
any local zoning or similar land use or government regulations in any material
respect (Liens, encumbrances and imperfections of title described in clause (A),
(B), (C), (D), (E) and (F) are hereinafter referred to as "Crown Permitted Real
                                                           --------------------
Estate 
- ------

                                      -24-
<PAGE>
 
Liens").  No condemnation of any material portion of the Crown Properties
- -----
has occurred; and the Crown Parties have not received any notice related to any
future or proposed condemnation of any material portion of the Crown Properties.

     5.16  Intellectual Property.
           --------------------- 

           (a)   Schedule 5.16 sets forth a true and complete list of all
material Intellectual Property owned, used, filed by or licensed to the Crown
Parties in connection with the Acquired Business. With respect to registered
trademarks, Schedule 5.16 sets forth a list of all jurisdictions in which such
trademarks are registered or applied for and all registrations and application
numbers. Except as set forth on Schedule 5.16, the Crown Parties own, and the
Crown Parties have the right to use, execute, reproduce, display, perform,
modify, enhance, distribute, prepare derivative works of and sublicenses,
without payment to any other person, all Intellectual Property listed in
Schedule 5.16 and, to the knowledge of the Crown Parties, the consummation of
the transactions contemplated hereby will not conflict with, alter or impair any
such rights. The Crown Parties have all rights to Intellectual Property which
are necessary in connection with the Acquired Business as it is presently being
conducted.

           (b)   The Crown Parties have not granted any licenses or contractual
rights of any kind relating to Intellectual Property listed on Schedule 5.16 or
the marketing or distribution thereof. None of the Crown Parties is bound by or
a party to any Contracts of any kind relating to the Intellectual Property of
any other Person, except as set forth on Schedule 5.16 and except for agreements
relating to computer software licensed to the Crown Parties in the ordinary
course of business consistent with past practice. Subject to the rights of third
parties set forth on Schedule 5.16, all Intellectual Property listed in Schedule
5.16 is free and clear of the claims of others and of all Liens whatsoever. The
conduct of the Acquired Business as it is presently being conducted and as it is
proposed to be conducted after the Closing as contemplated by the parties does
not and will not violate, conflict with or infringe the Intellectual Property of
any other Person. Except as set forth on Schedule 5.16, (i) no claims are
pending or, to the knowledge of the Crown Parties, threatened against the Crown
Parties by any Person with respect to the ownership, validity, enforceability,
effectiveness or use of any Intellectual Property and (ii) the Crown Parties
have not received any communications alleging that the Crown Parties have
violated any rights relating to Intellectual Property of any Person.


     5.17. Employees.
           --------- 

           (a)   Except as described in Schedule 5.17, the Crown Parties have no
contracts of employment with any employee and none of the Crown Parties is a
party to or subject to any collective bargaining agreements with respect to the
Crown Communications Business, Network or Mobile.  Schedule 5.17 contains a true
and complete list of all officers and key employees and a reasonably complete
list of all other employees, with their job titles and compensation, of the
Crown Communications Business, Network and Mobile as of July 1, 1997.

           (b)   No employee of the Crown parties shall (i) be entitled to
receive any termination, severance or deferred compensation payment as a result
of the transactions contemplated by this Agreement or (ii) be entitled to any
such payment in the event that any such 

                                      -25-
<PAGE>
 
employee ceases to be employed in the Crown Communications Business, by Network
or Mobile, upon the Closing.

           (c)   Schedule 5.17 lists each "employee benefit plan" (within the
meaning of Section 3(3) of the Employee Retirement Income Security Act of 1974,
as amended ("ERISA"), and each other employment, pension, welfare, savings,
             -----
deferred compensation, severance, termination, holiday, vacation, sick leave,
performance, incentive, bonus, insurance, stock option, stock purchase or other
equity-based plan, program, arrangement or understanding (a "Benefit Plan") with
respect to which the Crown Parties contribute or have any liability in respect
of any present or former employee of the Crown Communications Business, Network
or Mobile (each a "Crown Benefit Plan").  The Crown Parties have made available
                   ------------------                                          
to Buyer true and complete copies of any Crown Benefit Plan and related trust
agreements as in effect on July 11, 1997 and the most recent Form 5500 required
to be filed with respect to such Crown Benefit Plan.  No event has occurred
since the filing of the most recent Form 5500 that will materially increase the
cost of any Crown Benefit Plan.  No Crown Benefit Plan is a "multiemployer plan"
(within the meaning of Section 3(37) of ERISA) and with respect to the
operations of the Acquired Business, the Crown Parties are not required to
contribute to, nor have the Crown Parties maintained or contributed to or had an
obligation to maintain or contribute to, any such plan within the five full plan
years of any such plan immediately prior to July 11, 1997.

           (d)   Each of the Crown Benefit Plans is in compliance in all
material respects with all applicable requirements of ERISA, the Code and other
applicable law. Each of the Crown Benefit Plans has been administered in all
material respects in accordance with its terms. No Crown Benefit Plan which is a
"defined benefit plan" (within the meaning of Section 3(35) of ERISA) has a
material amount of unfunded benefit liabilities (within the meaning of Section
4001(a)(18) of ERISA). No "reportable event" (as defined in Section 4043 of
ERISA), "prohibited transaction" (within the meaning of Section 406 of ERISA or
Section 4975 of the Code) or breach of fiduciary responsibility has occurred
with respect to any Crown Benefit Plan which could subject Crown Communications,
Network or Mobile to a material penalty, tax or other liability under ERISA, the
Code or applicable law; there is no pending or, to the knowledge of the Crown
Parties, threatened claim or litigation by any party with respect to the Crown
Benefit Plans, other than routine claims for benefits. None of the Crown Parties
nor any entity required to be treated as a single employer under Section 414 of
the Code or Section 4001 of ERISA has a material actual or contingent liability
under Title IV of ERISA and no condition exists that could reasonably be
expected to give rise to any such liability.

           (e)   No Crown Benefit Plan (i) has an "accumulated funding
deficiency" within the meaning of Section 412(a) of the Code as of its most
recent plan year or (ii) has applied for or received a waiver of the minimum
funding standards imposed by Section 412 of the Code; and the Crown Parties have
not incurred any material liability to a Crown Benefit Plan (other than for
contributions not yet due) or to the Pension Benefit Guaranty Corporation (other
than for premiums not yet due).

           (f)   No employee of the Crown Parties will be entitled to any
additional benefits or any acceleration of the time of payment or vesting of any
benefits under any Crown Benefit Plan (other than under written employment
contracts listed on Schedule 5.17) as a result 

                                      -26-
<PAGE>
 
of the transactions contemplated hereby. The deduction of any amount payable
under any Crown Benefit Plan shall not be subject to disallowance under Section
280G of the Code.

           (g)   Each Crown Benefit Plan may be amended or terminated after the
Closing without material liability to Buyer, the Network Surviving Corporation
or the Mobile Surviving Corporation. The consummation of the transactions
contemplated by this Agreement shall not give rise to any material liability
with respect to any Crown Benefit Plan. Each Crown Benefit Plan intended to be a
qualified plan under Section 401(a) of the Code has been the subject of a
determination letter from the Internal Revenue Service (the "IRS") to the effect
                                                             ---
that such Crown Benefit Plan is qualified and exempt from Federal income taxes
under Sections 401(a) and 501(a), respectively, of the Code, and no event has
occurred that could adversely affect such qualified or exempt status.

     5.18  Litigation.  Schedule 5.18 sets forth a list of all pending lawsuits
           ---------- 
or claims with respect to which any of the Crown Parties has been contacted in
writing by counsel for the plaintiff or claimant against or affecting the
Acquired Business or arising out of the Acquired Business, including litigation
and claims relating to electromagnetic fields, and which (i) relate to or
involve more than $50,000, (ii) seek any material injunctive relief or (iii) may
give rise to any legal restraint on or prohibition against the transactions
contemplated by this Agreement. Except as set forth on Schedule 5.18, to the
knowledge of the Crown Parties, none of the lawsuits or claims listed in
Schedule 5.18 as to which there is at least a reasonable possibility of adverse
determination would have, if so determined, individually or in the aggregate, a
Crown Material Adverse Effect. Except as set forth on Schedule 5.18, to the
knowledge of the Crown Parties, there are no unasserted or threatened claims of
the type that would be required to be disclosed in Schedule 5.18. To the
knowledge of the Crown Parties, except as set forth on Schedule 5.18, none of
the Crown Parties is a party or subject to or in default under any material
judgment, order, injunction or decree of any Governmental Entity or arbitration
tribunal applicable to it or the Acquired Business. Except as set forth on
Schedule 5.18, there is no lawsuit or claim by any of the Crown Parties pending,
or which any of the Crown Parties intend to initiate, against any other Person.
Except as set forth on Schedule 5.18, to the knowledge of the Crown Parties,
there is no pending or threatened investigation of or affecting the Acquired
Business or the Crown Communications Business by any Governmental Entity.

     5.19. Brokers.  Other than Robert Coury, whose fees will be paid by
           ------- 
Sellers, there is no investment banker, broker or finder or other Person who
will have any valid claim against any of the Crown Parties for a commission or
brokerage fee in connection with this Agreement or the transactions contemplated
hereby as a result of any agreement of, or action taken by, any of the Crown
Parties.

     5.20. Contracts.  Except for Contracts listed on Schedule 5.20, none of the
           --------- 
Crown Parties is a party to or bound by any Contract relating to or affecting
the Crown Communications Business, Network or Mobile which is a:

           (a)   Contract with its agents, suppliers, customers, advertisers,
consultants, advisors, sales representatives, distributors, sales agents or
dealers other than Contracts which by their terms are cancelable by any of the
Crown Parties with notice of not more than 30 days and 

                                      -27-
<PAGE>
 
without cancellation penalties or severance payments, in the case of any such
Contract, in excess of $50,000;

           (b)   covenant not to compete (other than pursuant to any radius
restriction contained in any lease, reciprocal easement agreement or
development, construction, operating or similar agreement) or confidentiality
agreement;

           (c)   Contract with any Governmental Entity;

           (d)   agreement, Contract or other instrument under which any of the
Crown Parties has borrowed any money from, or issued any note, bond, debenture
or other evidence of indebtedness to, any Person or any other note, bond,
debenture or other evidence of indebtedness issued to any Person;

           (e)   Contract (including any so-called take-or-pay, cash deficiency
or keepwell agreement) under which (A) any Person (including any of the Crown
Parties) has directly or indirectly guaranteed indebtedness, liabilities or
obligations of any of the Crown Parties or (B) or any of the Crown Parties has
directly or indirectly guaranteed indebtedness, liabilities or obligations of
any Person, and other than endorsements for the purpose of collection in the
ordinary course of business consistent with past practice and including
agreements having the effect of a guarantee, whether or not required to be
reflected on the Crown Communications Business' Financial Statements in
accordance with GAAP;

           (f)   pledge, security agreement, deed of trust, financial statement
or other document granting a Lien on any of the assets of the Acquired Business
(other than Crown Permitted Liens or Crown Permitted Real Property Liens);

           (g)   Contract under which any of the Crown Parties has, directly or
indirectly, made any advance, loan, extension of credit or capital contribution
to, or other investment in, any Person (other than Network or Mobile) in excess
of $50,000;

           (h)   Contract under which any of the Crown Parties is lessee of, or
holds or operates, any machinery, equipment, vehicle or other tangible personal
property owned by a third party and used in the Acquired Business or the Crown
Communications Business and which entails payments in any 12-month period, in
the case of any such Contract, in excess of $50,000;

           (i)   Contract or other arrangement with (A) any other Crown Party or
any Affiliate of the Crown Parties or (B) any current or former officer,
director or employee, shareholder or with any relative, beneficiary, spouse or
Affiliate of any such Person (a "Related Person") of the Crown Communications
                                 --------------
Business, Network or Mobile or any of their respective affiliates;

           (j)   Contract for the sale of any assets of the Acquired Business
(including any capital stock or rights to acquire capital stock of Network or
Mobile) or the grant of any preferential rights to purchase any portion of the
Acquired Business or requiring the consent of any party to the transfer thereof
or otherwise limiting the Crown Parties' ability to sell any assets 

                                      -28-
<PAGE>
 
of the Acquired Business (including any capital stock or rights to acquire
capital stock of Network or Mobile);

           (k)   Contract not made in the ordinary course of business consistent
with past practice, including any joint venture or partnership arrangement or
any agreement relating to any merger or acquisition involving any of the Crown
Parties; or

           (l)   Contract whether or not made in the ordinary course of
business, which is material to the Acquired Business or the termination of which
would reasonably be expected to have a Crown Material Adverse Effect.

The Crown Parties are not, and to the knowledge of the Crown Parties, no other
party is (with or without the lapse of time or the giving of notice or both) in
default in any material respect under any Contract, License or instrument
required to be set forth in the Crown Parties disclosure schedules (each, a
"Seller Scheduled Contract").  The Crown Parties have made available to Buyer or
 -------------------------
its Representatives true and complete copies of all Seller Scheduled Contracts.
Each Seller Scheduled Contract is in full force and effect and constitutes a
legal, valid and binding obligation of Sellers, Network or Mobile, as the case
may be, and, to the knowledge of the Crown Parties, the other parties thereto,
enforceable in accordance with its terms.  The Crown Parties have not received
any written notice of the intention of any party to terminate any Seller
Scheduled Contract.

     5.21. Compliance with Laws.  Except as set forth on Schedule 5.21, the
           -------------------- 
operations of the Crown Communications Business, Network and Mobile are not now
being conducted and, to the knowledge of the Crown Parties, have not been
conducted in violation of any applicable law, ordinance, statute, rule or
regulation of any Governmental Entity except for violations which do not and
will not, individually or in the aggregate, have or reasonably be expected to
have a Crown Material Adverse Effect. None of the Crown Parties has received any
notice from any Governmental Entity that the operations of the Crown
Communications Business, Network and Mobile are being conducted in violation of
any applicable law, ordinance, statute, rule or regulation of any Governmental
Entity, or of any investigation or review pending or threatened by any
Governmental Entity investigating or reviewing any alleged violation, which
violation individually or in the aggregate with all other violations would have
or would reasonably be expected to have a Crown Material Adverse Effect. Except
as set forth on Schedule 5.21, all the Real Property included in the assets of
the Acquired Business is in compliance with applicable laws, including zoning,
land use and building code laws, ordinances and regulations necessary to conduct
the operations of the Acquired Business and the Crown Communications Business as
presently conducted, and the transactions contemplated by this Agreement could
not reasonably be expected to result in the revocation of any permit or
variance, except to the extent that any such non-compliance or violation or
revocation, individually or in the aggregate, would not have or would not
reasonably be expected to have a Crown Material Adverse Effect.

     5.22. Environmental Matters.
           --------------------- 

           (a)   Except as set forth on Schedule 5.22, the Crown Parties are in
compliance with all Environmental Laws (as defined herein), except for instances
of non-compliance that, 

                                      -29-
<PAGE>
 
individually or in the aggregate, do not or will not have or would not
reasonably be expected to result in a Crown Material Adverse Effect. No Lien has
attached to any Crown Property or facility of the Crown Communications Business,
Network or Mobile pursuant to any Environmental Laws. Except as set forth on
Schedule 5.22, there have been no Releases of Hazardous Material, as both terms
are defined herein, by any of the Crown Parties or, to the knowledge of the
Crown Parties, by any other Person, in, on, under or affecting any Crown
Property or facility of the Crown Communications Business, Network or Mobile,
and the Crown Parties have not disposed of any Hazardous Material in a manner
that in either case, individually or in the aggregate, could reasonably be
expected to result in a Crown Material Adverse Effect. Except as set forth on
Schedule 5.22, prior to the period of ownership or operation by any of the Crown
Parties of any Crown Property or facility of the Crown Communications Business,
Network or Mobile, to the knowledge of the Crown Parties, no Hazardous Material
was generated, treated, stored, disposed of, used, handled or manufactured at,
or transported, shipped or disposed of from, such currently or previously owned
properties and, except as set forth on Schedule 5.22, to the knowledge of the
Crown Parties, there were no Releases of Hazardous Material in, on, under or
affecting any such property. Except as set forth on Schedule 5.22, there are no
sites, locations or operations for which any of the Crown Parties have received
notice that it is or may be responsible for any remedial or response action, as
defined in any Environmental Law, relating to any Release of Hazardous Material.
Schedule 5.22 sets forth a list of any and all environmental audits of any Crown
Property or facility of the Crown Communications Business, Network or Mobile
conducted by the Crown Parties during their ownership of the Crown
Communications Business, Network or Mobile, or obtained by, or performed on
behalf of, any of the Crown Parties in connection with its acquisition of the
Crown Communications Business, Network or Mobile, and any environmental audits
in the Crown Parties' possession of any Crown Property or facility adjacent to
the Crown Communications Business, Network or Mobile which relate to any facts,
conditions or circumstances that have resulted, or may result, in a Release of
Hazardous Material at or under any Crown Property or facility of the Crown
Communications Business, Network or Mobile (collectively, the "Crown
                                                               -----
Environmental Audits"). Sellers have made copies of all Crown Environmental 
- --------------------
Audits available to Buyer.

           (b)   The Crown Parties have obtained, and are in compliance in all
material respects with, all permits, licenses, authorizations, registrations and
other governmental consents required by applicable Environmental Laws
("Environmental Permits").  Except as disclosed on Schedule 5.22, the Crown 
  ---------------------
Parties have not received notice of any civil, criminal or administrative claims
or proceedings, pending or threatened, that are based on or related to any
Environmental Laws or the failure to comply with any terms and conditions of any
Environmental Permits which claims or proceedings of which failure to comply,
individually or in the aggregate, would have or reasonably be expected to result
in a Crown Material Adverse Effect. To the knowledge of the Crown Parties,
except as described in Schedule 5.22, (i) there are no polychlorinated biphenyls
("PCBs") in any container or equipment on, about, under or within any Crown
  ----         
Property or facility of the Crown Communications Business, Network or Mobile,
(ii) there is no asbestos at, on, about, under or within any Crown Property or
facility of the Crown Communications Business, Network or Mobile, and (iii)
there are no underground storage tanks, whether in service or closed in place,
under any Crown Property or facility of the Crown Communications Business,
Network or Mobile.

                                      -30-
<PAGE>
 
           (c)   The term "Environmental Laws" means laws relating to the
                           ------------------
contamination, pollution or preservation of the environment or to human health.
The term "Release" has the meaning set forth in the Comprehensive Environmental
          -------                                                              
Response, Compensation, and Liability Act, as amended by the Superfund
Amendments and Reauthorization Act, 42 U.S.C. (S) 9601(22).  The term "Hazardous
                                                                       ---------
Material" means (1) hazardous materials, pollutants, contaminants, constituents,
- --------                                                                        
medical or infectious wastes, hazardous wastes and hazardous substances as those
terms are defined in any Environmental Law, (2) petroleum, including crude oil
and any by-products or fractions thereof, (3) natural gas, synthetic gas and any
mixtures thereof, (4) asbestos and/or asbestos-containing material, (5) radon
and (6) PCBs or materials or fluids containing PCBs.

     5.23. Taxes.
           ----- 

           (a)   For purposes of this Agreement "Taxes" shall mean all Federal, 
                                                 -----
state, local and foreign taxes or similar charges, including all income,
franchise, real property, withholding, employment, sales, excise and transfer
taxes and any interest and penalties thereon. The Crown Parties have timely
filed or caused to be timely filed, or will timely file or cause to be timely
filed on or prior to the Closing Date, all Tax returns and Tax reports which are
required to be filed (including proper filing extensions) on or prior to the
Closing date by Network or Mobile or the Crown Communications Business (the
"Returns"). All the Returns were or will be, as the case may be, complete and
 -------            
correct in all material respects at the time of filing. All Taxes due and
payable with respect to taxable periods covered by the Returns, or with respect
to which Network, Mobile or the Crown Communications Business is or might be
otherwise be liable (including Taxes which Network, Mobile or the Crown
Communications Business may have been required to withhold from amounts owing to
any stockholder, employee, creditor or third party), have been, or prior to the
Closing Date will be, timely paid. None of the Crown Communications Business,
Network or Mobile is delinquent in the payment of any Tax, or has any Tax
deficiencies proposed, assessed, or to the knowledge of the Crown Parties,
threatened against it. No Liens for Taxes exist with respect to any assets of
the Crown Communications Business, Network or Mobile.

           (b)   Schedule 5.23(b) sets forth the tax years through which the
Returns have been examined and closed or are returns with respect to which the
applicable period for assessment under applicable law, after giving effect to
extensions or waivers, has expired. Any deficiencies resulting from any Federal,
state, local or foreign audits or examinations of Network, Mobile or the Crown
Communications Business have been paid in full. There are no present audits,
disputes or proceedings as to any Taxes of Network, Mobile or the Crown
Communications Business. No material issued were raised in writing during any
audit, dispute or proceeding of Network, Mobile or the Crown Communications
Business that might apply to any taxable period subsequent to the taxable period
covered by such audit, dispute or proceeding. No power of attorney with respect
to Taxes of Network, Mobile or the Crown Communications Business has been filed
with any taxing jurisdiction or authority. None of the Crown Communications
Business, Network or Mobile has executed any waiver of the statute of
limitations on the assessment or collection of any Tax.

                                      -31-
<PAGE>
 
           (c)   Each of Network and Mobile, and all of its current or former
shareholders, have consented to a valid election for its first taxable year or
period, which election has not been revoked or terminated or otherwise become
ineffective for any subsequent taxable year or period, under Section 1362(a) of
the Code, to be taxed as an "S Corporation" under Sections 1361 through 1379 of
the Code.  Each of Network and Mobile, and all of its current or former
shareholders, have consented to a valid election, which election has not been
revoked or terminated or otherwise become ineffective, to be taxed in a
comparable fashion under comparable state, local or foreign Tax law, for each of
the taxable periods by each of the taxing jurisdictions set forth on Schedule
5.23(c).  Network, Mobile and the Crown Communications Business do not file, and
are not required to file, state or local Tax returns in any states or localities
other than those listed on Schedule 5.23(c).  None of the assets of Network or
Mobile are of a type described in Section 1374(d)(8) of the Code.

           (d)   None of the Crown Communications Business, Network or Mobile is
a party to or bound by any agreement (including any tax sharing agreement),
election or extension of the statute of limitations with respect to taxes. None
of the Crown Communications Business, Network or Mobile is or has ever been a
member of an affiliated, consolidated, combined or unitary group of which any
corporation other than Network or Mobile also is or was a member.

           (e)   Neither Network nor Mobile is a party to, and none of the
assets of Network, Mobile or the Crown Communications Business is subject to,
any lease made pursuant to Section 168(f)(8) of the Internal Revenue Code of
1954. No assets of Network, Mobile or the Crown Communications Business is "tax
exempt use property" within the meaning of Section 168(h) of the Code.

           (f)   Neither Network nor Mobile has taken any action that would
require it to include in income any adjustment under Section 481(a) of the Code
by reason of a change in accounting method initiated by Network or Mobile, and
the Internal Revenue Service has not proposed for any open Tax year any such
adjustment or change in accounting method. Neither Network nor Mobile will be
required to include in a taxable period (or portion thereof) beginning on or
after the Closing Date taxable income attributable to income that economically
accrued in a prior taxable period (or portion thereof), including as a result of
the installment method of accounting, the completed contract method of
accounting or the cash method of accounting.

     5.24. Insurance.  The Crown Parties maintain policies of fire and casualty,
           --------- 
liability and other forms of insurance with respect to the Crown Communications
Business, Network and Mobile in such amounts, with such deductibles and against
such risks and losses as are customary in the business in which they are
engaged. The insurance policies currently in effect and owned and maintained by
the Crown Parties are listed in Schedule 5.24.

     All such policies are in full force and effect, all premiums due and
payable thereon have been paid (other than retroactive or retrospective premium
adjustments that are not yet, but may be, required to be paid with respect to
any period ending prior to the Closing Date), and no notice of cancellation or
termination has been received with respect to any such policy which has not been
replaced on substantially similar terms prior to the date of such cancellation.
The activities and operations of the Crown Communications Business, Network and
Mobile have been 

                                      -32-
<PAGE>
 
conducted in a manner so as to conform in all material respects to all
applicable provisions of such insurance policies.

     5.25. Accounts Receivable.  All the accounts receivable included in the
           ------------------- 
Acquired Business (i) do and on the Closing Date will represent actual
indebtedness incurred by the applicable account debtors, (ii) have and on the
Closing Date will have arisen in the ordinary course of business consistent with
past practice and (iii) are and on the Closing Date will be subject to no prior
assignment, claim, Lien, dispute or unapplied credit of any nature whatsoever
other than Crown Permitted Liens.

     5.26. Securities Act.  The shares of Castle B Common Stock acquired by the
           -------------- 
Crowns in the Mergers and the Note are being acquired by the Crowns for
investment only and not with a view to any public distribution thereof, and the
Crowns shall not offer to sell or otherwise dispose of the shares so acquired by
them in violation of the registration requirements of the Securities Act of 1933
(the "Securities Act"). Each Seller is an "accredited investor" within the
      --------------
meaning of Rule 501 under the Securities Act and has sufficient knowledge and
experience in business and investment matters so as to be able to evaluate the
risks and merits of an investment in Buyer and, after the Closing, he or she is
each financially able to bear the risks of such investment, including the risk
of a complete loss of its investment in Buyer.

     5.27. Transactions with Affiliates.  Except as set forth in Schedule 5.27,
           ---------------------------- 
none of the Seller Scheduled Contracts between the Crown Communications
Business, Network or Mobile, on the one hand, and Sellers or any Affiliates or
Related Persons of the Crown Parties, on the other hand, will continue in effect
subsequent to the Closing. Except as set forth in Schedule 5.27, after the
Closing neither Sellers nor any Affiliate or Related Person of the Crown Parties
will have any interest in any property (real or personal, tangible or
intangible) or Contract used in or pertaining to the acquired Business. Neither
Sellers nor any Affiliate or Related Person of the Crown Parties has any direct
or indirect ownership interest in any Person in which the Crown Communications
Business, Network or Mobile has any direct or indirect ownership interest or
with which the Crown Communications Business, Network or Mobile competes or has
a business relationship. Except as set forth in Schedule 5.27, none of Sellers
or any Affiliates or Related Persons of the Crown Parties provide any material
services to the Crown Communications Business, Network or Mobile.

     5.28. Disclosure.  No statement of Sellers contained in this Article 5, in
           ---------- 
Exhibit D, in any of the disclosure schedules referred to in Article 5 or in any
certificates delivered by any of the Crown Parties pursuant to Section 1.1(k),
Section 4.2(d) and Section 7.1(c) intentionally contains any untrue statement of
a material fact or intentionally omits to state a material fact necessary to
make the statements contained herein or therein, in light of the circumstances
in which they are made, not misleading.

                                      -33-
<PAGE>
 
                                  ARTICLE 6.


                    Representations and Warranties of Buyer
                    ---------------------------------------


     6.1.  Corporate Status; Authority.  Each of Buyer and its Subsidiaries and
           ---------------------------
CTSH and its Subsidiaries is a corporation, partnership or other entity duly
organized, validly existing and in good standing under the laws of the
jurisdiction of its incorporation or organization. Each of Buyer and its
Subsidiaries and CTSH and its Subsidiaries is duly qualified and in good
standing to do business as a foreign corporation in each jurisdiction in which
the conduct or nature of its business or the ownership, leasing or holding of
its properties makes such qualification necessary, except such jurisdictions
where the failure to be so qualified or in good standing, individually or in the
aggregate, would not reasonably be expected to have a material adverse effect
(i) on the condition (financial or otherwise), business, liabilities,
properties, assets, prospects or results of operations of Buyer and its
Subsidiaries and CTSH and its Subsidiaries, taken as a whole, or (ii) on the
ability the buyer or its Subsidiaries to perform their obligations under or to
consummate the transactions contemplated by this Agreement (a "Buyer Material
                                                               --------------
Adverse Effect"). Each of Buyer and its Subsidiaries and CTSH and its
- --------------
Subsidiaries has all requisite corporate power to carry on its business as it is
now being conducted, to own and operate such business and each of Buyer, CAC I
and CAC II has all requisite corporate power to enter into this Agreement, to
perform its obligations hereunder and to complete the transactions contemplated
hereby.

     6.2.  Corporate Action.  All corporate and shareholder actions and
           ----------------
proceedings necessary to be taken by or on the part of Buyer, CAC I and CAC II,
as applicable, in connection with the transactions contemplated by the Buyer
Transaction Documents have been duly and validly taken, and this Agreement has
been duly and validly authorized, executed and delivered by Buyer, CAC I and CAC
II and constitutes, and each of the other Buyer Transaction Documents will be
duly and validly authorized, executed and delivered by Buyer and will
constitute, the legal, valid and binding obligations of Buyer, CAC I and CAC II,
as applicable, enforceable against Buyer, CAC I and CAC II, as applicable, in
accordance with and subject to its terms, except as may be limited by bankruptcy
or other laws affecting creditors' rights and by equitable principles.

     6.3.  No Conflicts.  Except as set forth on Schedule 6.3, neither the
           ------------
execution, delivery and performance by Buyer, CAC I or CAC II, as applicable, of
the Buyer Transaction Documents, nor the consummation by Buyer, CAC I and CAC II
of the transactions contemplated thereby is an event that, by itself or with the
giving of notice or the passage of time or both, will (i) conflict with the
certificate of incorporation or by-laws, as amended, of Buyer or the articles of
incorporation or by-laws of CAC I or CAC II, (ii) constitute a violation of, or
conflict with or result in any breach of or any default under, or constitute
grounds for termination or acceleration of, any mortgage, indenture, lease,
contract, agreement (including, without limitation, the agreement between the
British Broadcasting Corporation, CTSH and/or its Affiliates (the "BBC
                                                                   ---
Agreement") and the credit agreement between the Buyer and KeyBank National
- ---------
Association dated as of April 26, 1995 (as amended, the "Bank Credit
                                                         -----------
Agreement")) or instrument to which Buyer, any of its Subsidiaries, CAC I, CAC
- ---------
II, CTSH or any of its Subsidiaries is a party or by which it is bound, except
for such violations, conflicts, breaches, terminations and accelerations as
individually or in the aggregate would not have or be reasonably expected to
have a Buyer 

                                      -34-
<PAGE>
 
Material Adverse Effect or result in the creation of any material Lien upon any
of Buyer's assets such that it is reasonably likely that Buyer, CAC I and CAC II
will be unable to proceed with the transactions contemplated in this Agreement
or (iii) violate (A) any judgment, decree or order or (B) any statute, rule or
regulation, in each such case, applicable to Buyer, CAC I or CAC II. The
execution, delivery and performance by Buyer, CAC I and CAC II of this
Agreement, and by Buyer of the Shareholder Agreement, and the consummation by
Buyer, any of its Subsidiaries, CAC I, CAC II, CTSH or any of its Subsidiaries
of the transactions contemplated hereby or thereby, require no action by or in
respect of, or filing with, any Governmental Entity other than (a) the filing of
articles of merger with the Department of State of the Commonwealth of
Pennsylvania and of appropriate documentation with the relevant authorities of
other states in which CAC I or CAC II is qualified to do business; (b)
compliance with any applicable requirements of the Hart-Scott-Rodino Act; (c)
the approvals of the FCC contemplated by this Agreement; (d) actions or filings
which, if not taken or made, would not, individually or in the aggregate,
reasonably be expected to have a Buyer Material Adverse Effect; and (e) filings
and notices not required to be made or given until after the Effective Time.


     6.4.  Capitalization of Buyer and its Subsidiaries and CTSH and its
           -------------------------------------------------------------
Subsidiaries.
- ------------
           (a)   The authorized capital stock of Buyer consists of 208,313
shares of Class A Common Stock, par value $0.01 per share ("Castle A Common
                                                            ---------------
Stock"), of which 208,313 are duly authorized and validly issued and
- -----
outstanding, fully paid and nonassessable; 10,048,051 shares of Castle B Common
Stock, par value $0.01 per share, of which 408,433 are duly authorized and
validly issued and outstanding, fully paid and nonassessable; and 6,071,228
shares of Preferred Stock, par value $0.01 per share ("Preferred Stock"), of
                                                       ---------------
which 5,777,733 are duly authorized and validly issued and outstanding, fully
paid and nonassessable. A total of 1,080,375 shares of Castle B Common Stock are
reserved for issuance under Buyer's 1995 Stock Option Plan, as amended, and a
total of 6,095,025 shares of Castle B Common Stock are reserved for the
conversion of Castle A Common Stock and Preferred Stock of Buyer. Except as set
forth in this Section 6.4(a) and except for transactions contemplated by this
Agreement there are outstanding no shares of capital stock or other equity
securities of Buyer. Schedule 6.4(a) sets forth for each Subsidiary of Buyer the
amount of its authorized capital stock, the amount of its outstanding capital
stock and the record and beneficial owners of its outstanding capital stock. All
the outstanding shares of capital stock of each Subsidiary have been duly
authorized and validly issued and are fully paid and nonassessable. Except as
set forth on Schedule 6.4(a), there are no shares of capital stock or other
equity securities of any Subsidiary of Buyer outstanding. Neither the shares of
capital stock of Buyer nor those of any of its Subsidiaries have been issued in
violation of, and except as set forth on Schedule 6.4, none of such shares are
subject to, any purchase option, call, right of first refusal, preemptive,
subscription or similar rights under any provision of applicable law, the
certificate of incorporation, as amended, or by-laws of Buyer or the comparable
governing instruments of any of its Subsidiaries, any Contract to which Buyer or
any of its Subsidiaries is subject, bound or a party or otherwise. Except as
indicated above or as set forth on Schedule 6.4(a), there are no outstanding
warrants, options, rights, "phantom" stock rights, agreements, convertible or
exchangeable securities or other commitments (other than this Agreement and
Buyer's financing commitments dated as of June 27, 1997 from Lehman Brothers
Inc., copies of which have been made available to Sellers) (i) pursuant to which
Buyer or any of its Subsidiaries is or may become obligated to issue, sell,
purchase, return or redeem any shares of 

                                      -35-
<PAGE>
 
capital stock or other securities of Buyer or any of its Subsidiaries or (ii)
that give any Person the right to receive any benefits or rights similar to any
rights enjoyed by or accruing to holders of shares of capital stock of Buyer or
any of its Subsidiaries. Except as set forth above or on Schedule 6.4(a), there
are no equity securities of Buyer or any of its Subsidiaries reserved for
issuance for any purpose. Except as set forth on Schedule 6.4(a), Buyer has good
and valid title, directly or through one or more wholly owned Subsidiaries, to
all the outstanding shares of capital stock of each such Subsidiary, free and
clear of any Liens and restrictions of any kind. There are no outstanding bonds,
debentures, notes or other securities having the right to vote on any matters on
which stockholders of Buyer or any of its Subsidiaries may vote.

           (b)   The authorized share capital of CTSH consists of 11,477,290
ordinary shares, par value 1p per share ("CTSH Stock"), all of which are duly
                                          ----------
authorized and validly issued and outstanding, fully paid and nonassessable and
held of record by the Persons named in Schedule 6.4(b) in the respective amount
shown therein. Except as set forth in this Section 6.4(b) and except for
transactions contemplated by this Agreement there are outstanding no shares of
capital stock or other equity securities of CTSH. Schedule 6.4(b) sets forth for
each Subsidiary of CTSH the amount of its authorized share capital, the amount
of its outstanding capital stock and the record and beneficial owners of its
outstanding shares.  All the outstanding shares of capital stock of each
Subsidiary of CTSH have been duly authorized and validly issued and are fully
paid and nonassessable.  Except as set forth on Schedule 6.4(b), there are no
shares of capital stock or other equity securities of any Subsidiary of CTSH
outstanding.  Neither the shares of capital stock of CTSH nor those of any of
its Subsidiaries have been issued in violation of, and except as set forth on
Schedule 6.4(b), none of such shares are subject to, any purchase option, call,
right of first refusal, preemptive, subscription or similar rights under any
provision of applicable law or any charter documents of CTSH or the comparable
governing instruments of any of its Subsidiaries, any Contract to which CTSH or
any of its Subsidiaries is subject, bound or a party or otherwise.  Except as
indicated above or as set forth in Schedule 6.4(b), there are no warrants,
options, rights, "phantom" stock rights, agreements, convertible or exchangeable
securities or other commitments (other than this Agreement) outstanding as of
July 11, 1997 or as to which CTSH will be or is likely to become bound or
obligated in connection with the financing by Buyer of the transactions
contemplated hereby (i) pursuant to which CTSH or any of its Subsidiaries is or
may become obligated to issue, sell, purchase, return or redeem any shares of
capital stock or other securities of CTSH or any of its Subsidiaries or (ii)
that give any Person the right to receive any benefits or rights similar to any
rights enjoyed by or accruing to holders of share capital of CTSH or any of its
Subsidiaries.  Except as set forth above or on Schedule 6.4(b), there are no
equity securities of CTSH or any of its Subsidiaries reserved for issuance for
any purpose.  Except as set forth on Schedule 6.4(b), CTSH has good and valid
title, directly or through one or more wholly owned Subsidiaries, to all the
outstanding shares of capital stock of each of its Subsidiaries, free and clear
of any Liens and restrictions of any kind.  There are no outstanding bonds,
debentures, notes or other securities having the right to vote on any matters on
which stockholders of CTSH or any of its Subsidiaries may vote.

     6.5.  Equity Interests.  Except as set forth on Schedule 6.5 hereto, Buyer
           ----------------
does not directly or indirectly own any capital stock of or other equity
interests in any corporation, partnership or other Person and neither Buyer nor
any of its Subsidiaries is a member of or 

                                      -36-
<PAGE>
 
participant in any partnership, joint venture, limited liability company,
limited liability partnership or similar Person.

     6.6.  Financial Statements.
           --------------------

           (a)   Schedule 6.6(a) sets forth true, correct and complete copies of
(i) the balance sheet of Buyer and its consolidated Subsidiaries as at December
31, 1995, and December 31, 1996, and the statements of income and cash flows of
Buyer and its consolidated Subsidiaries for each of the years then ended,
together with the notes thereto and report thereon of KPMG Peat Marwick LLP,
independent public accountants (the "Buyer Audited Statements"); and (ii) the
                                     ------------------------                 
balance sheet of Buyer and its consolidated Subsidiaries as at May 31, 1997 and
the statements of income and cash flows of Buyer and its consolidated
Subsidiaries for the five months then ended (together with the Buyer Audited
Statements and the Buyer Interim Financial Statements, the "Buyer Financial
                                                            ---------------
Statements").  The Buyer Financial Statements have been, or in the case of the
- ----------                                                                    
Buyer Interim Financial Statements, will be, prepared from the books and records
of Buyer and present fairly (subject, in the case of the Buyer Interim Financial
Statements, to normal recurring year-end adjustments) the financial position of
Buyer and its consolidated Subsidiaries as at December 31, 1995 and 1996, May
31, 1997 and June 30, 1997 and the statements of income and cash flows of Buyer
and its consolidated Subsidiaries for the periods then ended in conformity with
GAAP applied on a basis consistent with past practices (except in each case as
described in the notes thereto or as otherwise disclosed in Schedule 6.6(a)).

           (b)   Schedule 6.6(b) sets forth true, correct and complete copies of
(i) the balance sheet of CTSH and its consolidated Subsidiaries as at March 31,
1997, and the consolidated profit and loss account and consolidated cash flow
statement for the seven-month period ended March 31, 1997, together with the
notes and report thereon of KPMG, Chartered Accountants (the "CTSH Audited
                                                              ------------
Statements"); and (ii) the CTSH Interim Financial Statements (collectively,
- ----------                                                                 
together with the CTSH Audited Statements, the "CTSH Financial Statements").
                                                -------------------------    
The CTSH Financial Statements have been prepared from the books and records of
CTSH and give a true and fair view of the state of affairs of CTSH and its
consolidated Subsidiaries as at March 31, 1997 and of their consolidated profit
for the period then ended and have been properly prepared in accordance with the
U.K. Companies Act 1985 (as if those requirements were to apply) applied on a
basis consistent with past practices (except in each case as described in the
notes thereto or as otherwise disclosed in Schedule 6.6(b).

     6.7.  No Undisclosed Liabilities.  Except as set forth on Schedule 6.7,
           --------------------------
there have been no material liabilities or obligations (whether pursuant to
Contracts or otherwise) of any kind whatsoever (whether accrued, contingent,
absolute, determined, determinable or otherwise) incurred by Buyer or any of its
Subsidiaries since December 31, 1996, or incurred by CTSH or any of its
Subsidiaries since March 31, 1997, other than:

           (a)   liabilities or obligations disclosed or provided for in the
balance sheet of Buyer and its Subsidiaries as of June 30, 1997 included in the
Buyer Interim Financial Statements or the balance sheet of CTSH and its
consolidated Subsidiaries as of June 30, 1997 included in the CTSH Interim
Financial Statements or in the notes to the Buyer Interim Financial Statements
or the CTSH Interim Financial Statements.

                                      -37-
<PAGE>
 
           (b)   liabilities or obligations incurred or that have arisen in the
ordinary course of business consistent with past practice which, individually
and in the aggregate have not had and would not reasonably be expected to have a
Buyer Material Adverse Effect; or

           (c)   liabilities or obligations under this Agreement or incurred in
connection with the transactions contemplated hereby.

     6.8.  Absence of Certain Changes or Events.  Since December 31, 1996, the
           ------------------------------------
business of Buyer and its Subsidiaries has been conducted in the ordinary course
consistent with past practice (including with respect to the collection of
receivables, payment of payables and other liabilities, advertising activities,
sales practices (including promotions, discounts and concessions), capital
expenditures and inventory levels, and contributions to or accruals to or in
respect of Benefit Plans). There has not occurred with respect to the business
of Buyer and its Subsidiaries since December 31, 1996 or with respect to the
business of CTSH and its Subsidiaries since March 31, 1997:

           (a)   any event, occurrence or development which, individually or in
the aggregate, has had or would reasonably be expected to have a Buyer Material
Adverse Effect.

           (b)   any action taken by the Buyer or any of its Subsidiaries which,
if taken after July 11, 1997, would constitute a breach of the covenant set
forth in Section 8.1.

      6.9. Licenses.  None of Buyer or any of its Subsidiaries owns, holds or
           --------
uses any Licenses which are material to the ownership or operation of their
respective businesses other than the Licenses listed on Schedule 6.9, true and
complete copies of which have been made available to Sellers. Schedule 6.9
identifies the legal holders of all Licenses relating to the business of Buyer
or any of its Subsidiaries. Such Licenses are valid and are in full force and
effect and, except as limited by the provisions of the Communications Act, and
the FCC's rules, regulations and policies and as otherwise specified on the face
of such Licenses, none of such Licenses is subject to any restriction or
condition which would limit in any material respect the operation of any
business of Buyer or any of its Subsidiaries as it is presently being conducted.
Buyer and its Subsidiaries are familiar with and have operated their respective
businesses (and any auxiliary assets operated in connection with the operation
of such businesses) at all times in material compliance with generally accepted
industry practices and in compliance in all material respects with the Licenses,
the Communications Act and the existing rules, regulations and policies of the
FCC and the rules and regulations and policies of the FAA. Except as shown on
Schedule 6.9, no application, action or proceeding is pending for the renewal or
modification of any of the Licenses and there is not now before any Governmental
Entity any investigation or complaint against Buyer or any of its Subsidiaries
the unfavorable resolution of which would impair the qualifications of any of
Buyer or any of its Subsidiaries to hold any of the Licenses. Except as shown on
Schedule 6.9, no event or events have occurred which, individually or in the
aggregate, and with or without the giving of notice or the lapse of time or
both, would constitute grounds for, or which could result in, the revocation or
termination of any License or the imposition of any restriction or limitation by
any Governmental Entity on the operation of the businesses of Buyer or any of
its Subsidiaries.  No Licenses other than those shown on Schedule 

                                      -38-
<PAGE>
 
6.9 are necessary or required to operate any business of Buyer or its
Subsidiaries as it is presently being conducted.

     6.10. Assets Other than Real Property Interests.
           ----------------------------------------- 

           (a)   Buyer and its Subsidiaries have good and valid title to all
assets reflected on the December 31, 1996 balance sheet of Buyer and its
consolidated Subsidiaries included in the Buyer Financial Statements (the
"December 31 Buyer Balance Sheet") or thereafter acquired, except those sold or
 -------------------------------
otherwise disposed of in the ordinary course of business consistent with past
practice and not in violation of this Agreement, in each case free and clear of
all Liens of any kind except (i) such as are set forth on Schedule 6.10, (ii)
mechanics', carriers', workmen's, repairmen's or other like Liens arising or
incurred in the ordinary course of business consistent with past practice, (iii)
Liens which secure debt that is reflected as a liability on the balance sheets
as of June 30, 1997 included in the Buyer Interim Financial Statements and other
debt incurred under existing credit facilities of Buyer or its Subsidiaries and
(iv) other imperfections of title or encumbrances, if any, which do not,
individually or in the aggregate, materially impair the continued use and
operation of the assets to which they relate, as presently conducted (Liens,
encumbrances and imperfections of title described in clauses (i), (ii), (iii)
and (iv) above are hereinafter referred to collectively as "Buyer Permitted
                                                            ---------------
Liens"). Schedule 6.10 sets forth a list of all material personal property owned
- -----
by Buyer and its Subsidiaries and used or held for use in connection with their
respective businesses.

           (b)   All the material tangible assets used, held for use or
necessary in the operation of the businesses of Buyer and its Subsidiaries (i)
have been and are being maintained in accordance with the customary industry
practice, (ii) are free from material defects and (iii) are in all material
respects in good working condition, reasonable wear and tear and depreciation
excepted. All leased personal property used, or held for use or necessary in the
operation of the businesses of Buyer and its Subsidiaries is in all material
respects in the condition required of such property by the terms of the lease
applicable thereto during the term of the lease and upon the expiration thereof.

     This Section 6.10 does not relate to Real Property or interests in Real
Property, such items being the subject of Section 6.11.

     6.11. Title to Real Property.  Schedule 6.11 sets forth a complete list of
           ----------------------
all Real Property and interests in Real Property used or held for use in the
operation of the businesses of Buyer and its Subsidiaries and owned in fee by
Buyer or any of its Subsidiaries (individually, a "Buyer Owned Property") and
                                                   --------------------
identifies any material reciprocal easement or operating agreements (other than
such operating agreements not relating to Real Property identified on other
disclosure schedules of Buyer attached hereto) relating thereto. Schedule 6.11
sets forth a complete list of all Real Property and interests in Real Property
used, or held for use in the operation of the businesses of Buyer and its
Subsidiaries leased by Buyer or any of its Subsidiaries (individually, a "Buyer
                                                                          -----
Leased Property") and identifies any material leases and reciprocal easement or
- ---------------
operating agreements (other than such operating agreements not relating to Real
Property identified on other disclosure schedules of Buyer attached hereto)
relating thereto. Buyer and its Subsidiaries have (i) good and insurable fee
title to all Buyer Owned Property and (ii) assuming good and 

                                      -39-
<PAGE>
 
adequate title in each lessor of a leasehold estate, good and valid title to the
leasehold estates in all Buyer Leased Property (a Buyer Owned Property or Buyer
Leased Property being sometimes referred to herein, individually, as a "Buyer
                                                                        -----
Property" and, collectively, as "Buyer Properties"), in each case free and clear
- --------                         ----------------
of all Liens and other similar restrictions of any nature whatsoever, except (A)
such as are set forth on Schedule 6.11, (B) leases, subleases and similar
agreements set forth on Schedule 6.16, (C) Buyer Permitted Liens, (D) easements,
covenants, rights-of-way and other similar restrictions of record, (E) any
conditions that may be shown by a current, accurate survey or readily determined
by a physical inspection of any Buyer Property made prior to Closing and (F) (I)
zoning, building and other similar restrictions, (II) Liens and other similar
restrictions that have been placed by any developer, landlord or other third
party on property over which the Buyer Parties have easement rights or on any
Buyer Leased Property and subordination or similar agreements relating thereto,
and (III) unrecorded easements, covenants, rights-of-way and other similar
restrictions, none of which items set forth in clauses (I), (II) and (III),
individually or in the aggregate, materially impair the continued use and
operation of the property to which they relate, as presently conducted. Except
as set forth on Schedule 6.17, to the knowledge of Buyer, the current use by
Buyer and its Subsidiaries of the plants, offices and other facilities located
on Buyer Property does not violate any local zoning or similar land use or
government regulations in any material respect. No condemnation of any material
portion of the Buyer Properties has occurred; and Buyer and its Subsidiaries
have not received any notice related to any future or proposed condemnation of
any material portion of the Buyer Properties.

     6.12. Intellectual Property.
           --------------------- 

           (a)   Schedule 6.12 sets forth a true and complete list of all
material Intellectual Property owned, used, filed by or licensed to Buyer or any
of its Subsidiaries. With respect to registered trademarks, Schedule 6.12 sets
forth a list of all jurisdictions in which such trademarks are registered or
applied for and all registrations and application numbers. Except as set forth
on Schedule 6.12, the Buyer and its Subsidiaries own, and Buyer and its
Subsidiaries have the right to use, execute, reproduce, display, perform,
modify, enhance, distribute, prepare derivative works of and sublicenses,
without payment to any other Person, all Intellectual Property listed in
Schedule 6.12 and, to the knowledge of Buyer or its Subsidiaries, the
consummation of the transactions contemplated hereby will not conflict with,
alter or impair any such rights. Buyer and its Subsidiaries have all rights to
Intellectual Property as are necessary in connection with their respective
businesses as they are presently being conducted.

           (b)   Buyer and its Subsidiaries have not granted any licenses or
contractual rights of any kind relating to Intellectual Property listed on
Schedule 6.12 or the marketing or distribution thereof. Buyer and its
Subsidiaries are not bound by or a party to any Contracts of any kind relating
to the Intellectual Property of any other Person, except as set forth on
Schedule 6.12 and except for agreements relating to computer software licensed
to Buyer and its Subsidiaries in the ordinary course of business consistent with
past practice. Subject to the rights of third parties set forth on Schedule
6.12, all Intellectual Property listed in Schedule 6.12 is free and clear of the
claims of others and of all Liens whatsoever. The conduct of the businesses of
Buyer and its Subsidiaries as they are presently being conducted and as they are
proposed to be conducted after the Closing as contemplated by the parties does
not and will not violate, conflict with or infringe the Intellectual Property of
any other Person. Except as set forth on 

                                      -40-
<PAGE>
 
Schedule 6.12, (i) no claims are pending or, to the knowledge of Buyer or any of
its Subsidiaries, threatened against Buyer or any of its Subsidiaries by any
Person with respect to the ownership, validity, enforceability, effectiveness or
use of any Intellectual Property and (ii) Buyer and its Subsidiaries have not
received any communications alleging that Buyer or any of its Subsidiaries has
violated any rights relating to Intellectual Property of any Person.

     6.13. Employees.
           --------- 

           (a)   Except as described on Schedule 6.13, Buyer and its
Subsidiaries have no contracts of employment with any employee and are not a
party to or subject to any collective bargaining agreements. Schedule 6.13
contains a true and complete list of all officers and key employees of Buyer and
each of its Subsidiaries as of July 1, 1997.

           (b)   No employee of Buyer or any of its Subsidiaries shall be
entitled to receive any termination, severance or deferred compensation payment
as a result of the transactions contemplated by this Agreement.

           (c)   Schedule 6.13 lists each Benefit Plan with respect to which
Buyer and its Subsidiaries contribute or have any liability (each a "Buyer
                                                                     -----
Benefit Plan"). Buyer has made available to the Crown Parties true and complete
- ------------
copies of any Buyer Benefit Plan and related trust agreements as in effect on
July 11, 1997 and the most recent Form 5500 required to be filed with respect to
such Buyer Benefit Plan. No event has occurred since the filing of the most
recent Form 5500 that will materially increase the cost of any Buyer Benefit
Plan. No Buyer Benefit Plan is a "multiemployer plan" (within the meaning of
Section 3(37) of ERISA), and with respect to the operations of their businesses,
Buyer and its Subsidiaries are not required to contribute to, nor have Buyer and
its Subsidiaries maintained or contributed to or had an obligation to maintain
or contribute to, any such plan within the five full plan years of any such plan
immediately prior to July 11, 1997.

           (d)   Each of the Buyer Benefit Plans is in compliance in all
material respects with all applicable requirements of ERISA, the Code and other
applicable law. Each of the Buyer Benefit Plans has been administered in all
material respects in accordance with its terms. No Buyer Benefit Plan which is a
"defined benefit plan" (within the meaning of Section 3(35) of ERISA) has a
material amount of unfunded benefit liabilities (within the meaning of Section
4001(a)(18) of ERISA). No "reportable event" (as defined in Section 4043 of
ERISA), "prohibited transaction" (within the meaning of Section 406 of ERISA or
Section 4975 of the Code) or breach of fiduciary responsibility has occurred
with respect to any Buyer Benefit Plan which could subject the Crown Parties or
Buyer to a material penalty, tax or other liability under ERISA, the Code or
applicable law; there is no pending or, to the knowledge of Buyer, threatened
claim or litigation by any party with respect to the Buyer Benefit Plans, other
than routine claims for benefits. None of Buyer or its Subsidiaries nor any
entity required to be treated as a single employer under Section 414 of the Code
or Section 4001 of ERISA has a material, actual or contingent liability under
Title IV of ERISA and no condition exists that could reasonably be expected to
give rise to any such liability.

                                      -41-
<PAGE>
 
           (e)   No Buyer Benefit Plan (i) has an "accumulated funding
deficiency" within the meaning of Section 412(a) of the Code as of its most
recent plan year of (ii) has applied for or received a waiver of the minimum
funding standards imposed by Section 412 of the Code; and Buyer and its
Subsidiaries have not incurred any material liability to a Buyer Benefit Plan
(other than for contributions not yet due) or to the Pension Benefit Guaranty
Corporation (other than for premiums not yet due).

           (f)   No employee of Buyer or any of its Subsidiaries will be
entitled to any additional benefits or any acceleration of the time of payment
or vesting of any benefits under any Buyer Benefit Plan (other than under
written employment contracts listed on Schedule 6.13) as a result of the
transactions contemplated hereby. The deduction of any amount payable under any
Buyer Benefit Plan shall not be subject to disallowance under Section 280G of
the Code.

           (g)   Each Buyer Benefit Plan may be amended or terminated after the
Effective Time without material liability to Buyer, Network or Mobile.

           (h)   The consummation of the transactions contemplated by this
Agreement shall not give rise to any material liability with respect to any
Buyer Benefit Plan.

           (i)   Each Buyer Benefit Plan intended to be a qualified plan under
Section 401(a) of the Code has been the subject of a determination letter from
the IRS to the effect that such Buyer Benefit Plan is qualified and exempt from
Federal income taxes under Sections 401(a) and 501(a), respectively, of the
Code, and no event has occurred that could adversely affect such qualified or
exempt status.

     6.14. Litigation.  Schedule 6.14 sets forth a list of all pending lawsuits
           ----------
or claims with respect to which Buyer or any of its Subsidiaries has been
contacted in writing by counsel for the plaintiff or claimant against or
affecting Buyer or any Subsidiary or any of their respective properties, assets,
operations or businesses, and which (i) relate to or involve more than $50,000,
(ii) seek any material injunctive relief or (iii) may give rise to any legal
restraint on or prohibition against the transactions contemplated by this
Agreement. Except as set forth on Schedule 6.14, to the knowledge of Buyer or
its Subsidiaries, none of the lawsuits or claims listed in Schedule 6.14 as to
which there is at least a reasonable possibility of adverse determination would
have, if so determined, individually or in the aggregate, a Buyer Material
Adverse Effect. Except as set forth on Schedule 6.14, to the knowledge of Buyer
and its Subsidiaries, there are no unasserted or threatened claims of the type
that would be required to be disclosed in Schedule 6.14. To the knowledge of
Buyer and its Subsidiaries, except as set forth on Schedule 6.14, none of Buyer
and its Subsidiaries is a party or subject to or in default under any material
judgment, order, injunction or decree of any Governmental Entity or arbitration
tribunal applicable to it or its respective properties, assets, operations or
businesses. Except as set forth on Schedule 6.14, there is no lawsuit or claim
by Buyer or any of its Subsidiaries pending, or which Buyer or any of its
Subsidiaries intend to initiate, against any other Person. Except as set forth
on Schedule 6.14, to the knowledge of Buyer and its Subsidiaries, there is no
pending or threatened investigation of or affecting Buyer or any of its
Subsidiaries by any Governmental Entity.

                                      -42-
<PAGE>
 
     6.15. Brokers.  There is no investment banker, broker or finder or other
           -------
Person who will have any valid claim against Buyer, CAC I or CAC II for a
commission or brokerage in connection with this Agreement or the transactions
contemplated hereby as a result of any agreement of, or action taken by, Buyer,
other than Lehman Brothers whose fees will be paid by Buyer.

     6.16. Contracts.  Except for Contracts listed on Schedule 6.16, neither the
           ---------
Buyer nor any of its Subsidiaries is a party to or bound by any Contract
relating to or affecting the assets of Buyer and its Subsidiaries which is a:

           (a)   Contract with its agents, suppliers, customers, advertisers,
consultants, advisors, sales representatives, distributors, sales agents or
dealers other than Contracts which by their terms are cancelable by Buyer or any
of its Subsidiaries with notice of not more than 30 days and without
cancellation penalties or severance payments, in the case of any such Contract,
in excess of $50,000;

           (b)   covenant not to compete (other than pursuant to any radius
restrictions contained in any lease, reciprocal easement agreement or
development, construction, operating or similar agreement) or confidentiality
agreement;

           (c)   Contract with any Governmental Entity;

           (d)   agreement, Contract or other instrument under which Buyer or
any of its Subsidiaries has borrowed any money from, or issued any note, bond,
debenture or other evidence of indebtedness to, any Person or any other note,
bond, debenture or other evidence of indebtedness issued to any Person;

           (e)   Contract (including any so-called take-or-pay, cash deficiency
or keepwell agreement) under which (A) any Person (including Buyer or any of its
Subsidiaries) has directly or indirectly guaranteed indebtedness, liabilities or
obligations of Buyer or any of its Subsidiaries or (B) or Buyer or any of its
Subsidiaries has directly or indirectly guaranteed indebtedness, liabilities or
obligations of any Person, and other than endorsements for the purpose of
collection in the ordinary course of business consistent with past practice and
including agreements having the effect of a guarantee, whether or not required
to be reflected on the Buyer Financial Statements in accordance with GAAP;

           (f)   pledge, security agreement, deed of Trust, financial statement
or other document granting a Lien on any of the assets of Buyer or any of its
Subsidiaries (other than Buyer Permitted Liens);

           (g)   Contract under which Buyer or any of its Subsidiaries has,
directly or indirectly, made any advance, loan, extension of credit or capital
contribution to, or other investment in, any Person in excess of $50,000;

           (h)   Contract under which Buyer or any of its Subsidiaries is lessee
of, or holds or operates, any machinery, equipment, vehicle or other tangible
personal property owned by a 

                                      -43-
<PAGE>
 
third party and used in the business of Buyer or any of its Subsidiaries and
which entails payments in any 12-month period, in the case of any such Contract,
in excess of $50,000;

           (i)   Contract or other arrangement with (A) any affiliate of Buyer
or any of its Subsidiaries or (B) any current or former officer, director or
employee, shareholder or with any Related Person of Buyer or any of its
Subsidiaries or any of their respective affiliates;

           (j)   Contract for the sale of any of the assets of Buyer and its
Subsidiaries (including any capital stock or rights to acquire capital stock of
Buyer and its Subsidiaries) or the grant of any preferential rights to purchase
any of the assets of Buyer and its Subsidiaries or requiring the consent of any
party to the transfer thereof or otherwise limiting the ability of Buyer and its
Subsidiaries to sell the assets of Buyer and its Subsidiaries (including any
capital stock or rights to acquire capital stock of Buyer and its Subsidiaries);

           (k)   Contract not made in the ordinary course of business consistent
with past practice, including any joint venture or partnership arrangement or
any agreement relating to any merger or acquisition involving the Buyer or any
of its Subsidiaries; or

           (l)   Contract whether or not made in the ordinary course of
business, which is material to Buyer and its Subsidiaries, taken as a whole, or
the termination of which could reasonably be expected to have a Buyer Material
Adverse Effect.

Buyer and its Subsidiaries are not, and to the best of the knowledge of Buyer
and its Subsidiaries, no other party is (with or without the lapse of time or
the giving of notice or both) in default in any material respect under any
Contract, License or instrument required to be set forth in Buyer's disclosure
schedules (each, a "Buyer Scheduled Contract").  Buyer and its Subsidiaries have
                    ------------------------                                    
made available to the Crown Parties or their Representatives true and complete
copies of all Buyer Scheduled Contracts.  Each Buyer Scheduled Contract is in
full force and effect as of July 11, 1997 and constitutes a legal, valid and
binding obligation of Buyer and its Subsidiaries and, to the best of the
knowledge of Buyer and its Subsidiaries, the other parties thereto, enforceable
in accordance with its terms.  Neither Buyer nor any of its Subsidiaries has
received any written notice of the intention of any party to terminate any Buyer
Scheduled Contract.

     6.17. Compliance with Laws.  Except as set forth on Schedule 6.17, the
           --------------------
operations of Buyer and its Subsidiaries are not now being conducted and, to the
knowledge of Buyer or any of its Subsidiaries, have not been conducted in
violation of any applicable law, ordinance, statute, rule or regulation of any
Governmental Entity except for violations, which do not and will not,
individually or in the aggregate, have or be reasonably expected to have a Buyer
Material Adverse Effect. Buyer and its Subsidiaries have not received any notice
from any Governmental Entity that the operations of Buyer and its Subsidiaries
are being conducted in violation of any applicable law, ordinance, statute, rule
or regulation of any Governmental Entity, or of any investigation or review
pending or threatened by any Governmental Entity investigating or reviewing any
alleged violation, which violation individually or in the aggregate with all
other violations would have or would reasonably be expected to have a Buyer
Material Adverse Effect. Except as set forth on Schedule 6.17 to this Agreement,
all the Real Property of Buyer and its Subsidiaries is in compliance with
applicable laws, including zoning, land use and building code laws, ordinances

                                      -44-
<PAGE>
 
and regulations necessary to conduct the operations of Buyer and its
Subsidiaries as presently conducted, and the transactions contemplated by this
Agreement could not reasonably be expected to result in the revocation of any
permit or variance, except to the extent that any such non-compliance, violation
or revocation, individually or in the aggregate, would not have or would not
reasonably be expected to have a Buyer Material Adverse Effect.

     6.18. Environmental Matters.
           --------------------- 

           (a)   Except as set forth on Schedule 6.18, Buyer and its
Subsidiaries are in compliance with all Environmental Laws, except for instances
of non-compliance, that, individually or in the aggregate, do not or will not
have or would not reasonably be expected to have a Buyer Material Adverse Effect
on the financial condition, business, operations or assets of Buyer and its
Subsidiaries. No Lien has attached to any Buyer Property or facility of Buyer
and its Subsidiaries pursuant to any Environmental Laws. Except as set forth on
Schedule 6.18, there have been no Releases of Hazardous Material by Buyer or any
of its Subsidiaries or, to the knowledge of Buyer or any of its Subsidiaries, by
any other Person in, on, under or affecting any Buyer Property or facility of
Buyer and its Subsidiaries, and Buyer and its Subsidiaries have not disposed of
any Hazardous Material in a manner that, in either case, individually or in the
aggregate, could reasonably be anticipated to result in a Buyer Material Adverse
Effect. Except as set forth on Schedule 6.18, prior to the period of ownership
or operation by Buyer and its Subsidiaries of any Buyer Property or facility, to
the knowledge of Buyer, no Hazardous Material was generated, treated, stored,
disposed of, used, handled or manufactured at, or transported, shipped or
disposed of from, such current or previously owned properties and, except as set
forth on Schedule 6.18, to the knowledge of Buyer, there were no Releases of
Hazardous Material in, on, under or affecting any such property. Except as set
forth on Schedule 6.18, there are no sites, locations or operations for which
Buyer and its Subsidiaries have received notice that they are or may be
responsible for any remedial or response action, as defined in any Environmental
Law, relating to any Release of Hazardous Material. Schedule 6.18 sets forth a
list of any and all environmental audits of any Buyer Property or facility of
Buyer and its subsidiaries conducted by Buyer or by any of its Subsidiaries
during Buyer's or a Subsidiary's ownership of such Buyer Property or facility,
or obtained by, or performed on behalf of, Buyer and its Subsidiaries in
connection with its acquisition of any Buyer Property or facility, and any
audits in the possession of Buyer and its Subsidiaries of any Buyer Property or
facility adjacent to their facilities which relate to any facts, conditions or
circumstances that have resulted, or may result, in a Release of Hazardous
Material at or under such Buyer Property or facility (collectively, the "Buyer
                                                                         -----
Environmental Audits").  Buyer has made copies of all Buyer Environmental Audits
- --------------------                                                            
available to Sellers.

           (b)   Buyer and its Subsidiaries have obtained, and are in material
compliance in all material respects with all Environmental Permits. Except as
disclosed on Schedule 6.18, Buyer and its Subsidiaries have not received notice
of any civil, criminal or administrative claims or proceedings, pending or
threatened, that are based on or related to any Environmental Laws or the
failure to comply with any terms and conditions of any Environmental Permits
which claims or proceedings of which failure to comply, individually or in the
aggregate, would have or reasonably be expected to result in a Buyer Material
Adverse Effect. To the knowledge of Buyer, except as described in Schedule 6.18,
(i) there are no PCBs in any container or equipment on, about, under 

                                      -45-
<PAGE>
 
or within any Buyer Real Property or facility of Buyer and its Subsidiaries,
(ii) there is no asbestos at, on, about, under or within any Real Property or
facility of Buyer and its Subsidiaries and (iii) there are no underground
storage tanks, whether in service or closed in place, under any Buyer Property
or facility of Buyer or its Subsidiaries.

     6.19. Taxes.
           ----- 

           (a)   Buyer and its Subsidiaries have timely filed or caused to be
timely filed, or will timely file or cause to be timely filed on or prior to the
Closing Date, all Tax returns and Tax reports which are required to be filed
(including proper filing extensions) on or prior to the Closing Date by them.
All such returns were or will be, as the case may be, complete and correct in
all material respects at the time of filing. All Taxes due and payable with
respect to taxable periods covered by such returns, or with respect to which any
of Buyer or its Subsidiaries is or might be otherwise liable (including Taxes
which Buyer and its Subsidiaries may have been required to withhold from amounts
owing to any stockholder, employee, creditor or third party), have been, or
prior to the Closing Date will be, timely paid. Except as disclosed in schedule
6.7, none of Buyer or any of its Subsidiaries is delinquent in the payment of
any Tax, or has any Tax deficiencies proposed, assessed, or to the knowledge of
Buyer, threatened against it. No Liens for Taxes exist with respect to any
assets of Buyer or its Subsidiaries.

           (b)   Any deficiencies resulting from any tax audits or examinations
of Buyer or any of its Subsidiaries have been paid in full. There are no present
audits, disputes or proceedings as to any Taxes of Buyer or any of its
Subsidiaries. No material issues were raised in writing during any audit,
dispute or proceeding of Buyer or any of its Subsidiaries that might apply to
any taxable period subsequent to the taxable period covered by such audit,
dispute or proceeding.

           (c)   None of Buyer or its Subsidiaries is a party to or bound by any
agreement (including any tax sharing agreement), election or extension of the
statute of limitations with respect to taxes. None of the Buyer or its
Subsidiaries is or has ever been a member of an affiliated, consolidated,
combined or unitary group of which any corporation other than Buyer or any of
its Subsidiaries also is or was a member.

           (d)   Neither Buyer nor any of its Subsidiaries has taken any action
that would require it to include in income any adjustment under Section 481(a)
of the Code by reason of a change in accounting method initiated by Buyer or any
of its Subsidiaries, and the Internal Revenue Service has not proposed for any
open Tax year any such adjustment or change in accounting method. Neither Buyer
nor any of its Subsidiaries will be required to include in a taxable period (or
portion thereof) beginning on or after the Closing Date taxable income
attributable to income that economically accrued in a prior taxable period (or
portion thereof), including as a result of the installment method of accounting,
the completed contract method of accounting or the cash method of accounting.

     6.20. Insurance.  Buyer and its Subsidiaries maintain policies of fire and
           ---------
casualty, liability and other forms of insurance in such amounts, with such
deductibles and against such risks and losses as are customary in the businesses
in which they are engaged. The insurance policies currently in effect and owned
and maintained by Buyer and its Subsidiaries are listed in Schedule 

                                      -46-
<PAGE>
 
6.20. All such policies are in full force and effect, all premiums due and
payable thereon have been paid (other than retroactive or retrospective premium
adjustments that are not yet, but may be, required to be paid with respect to
any period ending prior to the Closing Date), and no notice of cancellation or
termination has been received with respect to any such policy which has not been
replaced on substantially similar terms prior to the date of such cancellation.
The activities and operations of Buyer and its Subsidiaries have been conducted
in a manner so as to conform in all material respects to all applicable
provisions of such insurance policies.

     6.21. Disclosure.  No statement of Buyer contained in this Article 6, in
           ----------
Exhibit C, in any of the disclosure schedules referred to in Article 6 or in any
Certificates delivered pursuant to Section 4.3(f) intentionally contains any
untrue statement of a material fact or intentionally omits to state a material
fact necessary to make the statements contained herein or therein, in light of
the circumstances in which they are made not misleading.

                                  ARTICLE 7.

                             Covenants of Sellers
                             --------------------

     Each of the Crown Parties, on a joint and several basis, from July 11, 1997
until the completion of the Closing, covenants and agrees as follows:

     7.1.  Operation of the Business.  From July 11, 1997 until the Closing,
           -------------------------
except as expressly provided otherwise in this Agreement, the Crown Parties
shall conduct, or cause to be conducted, the Crown Communications Business and
the businesses of Network and Mobile in the ordinary course consistent with past
practice (including with respect to the collection of receivables, payment of
payables and other liabilities, advertising activities, sales practices
(including promotions, discounts and concessions), capital expenditures and
inventory levels, and contributions to or accruals to or in respect of Benefit
Plans). Furthermore, without limiting the generality of the foregoing, until the
Closing, the Crown Parties will (i) use reasonable commercial efforts to (A)
preserve intact their business organizations and the business organization of
the Crown Communications Business, (B) keep available to Buyer and the Surviving
Corporations the services of the present officers and key employees of the Crown
Communications Business, Network and Mobile, (C) continue in full force and
effect without modification all existing policies or binders of insurance
currently maintained in respect of the Crown Communications Business, Network
and Mobile, (D) preserve their current material relationships with customers,
suppliers, creditors, employees, licensors, licensees, distributors and others
with whom any of the Crown Parties has a material business or financial
relationship, (E) safeguard the inventory of the Crown Communications Business,
Network and Mobile from theft or misappropriation, (F) maintain the books and
records of the Crown Communications Business, Network and Mobile in
substantially the same manner as presently maintained and (G) continue the
construction and development of all in progress construction and development
sites, and (ii) not engage in any practice, take any action, fail to take any
action or enter into any transaction that would or would reasonably be expected
to result in any of the conditions set forth in Article 11 not being satisfied
on the Closing Date. In the event of damage, destruction or loss affecting any
assets of the Crown Communications Business, Network or Mobile between July 

                                      -47-
<PAGE>
 
11, 1997 and the Closing Date, the Crown Parties may (but shall not be obligated
to) prior to the Closing Date elect to repair (or undertake to repair) such
damage, destruction or loss at the expense of Sellers.

     In furtherance and not in limitation of the foregoing, each of the Crown
Parties covenants and agrees that, prior to the Closing, without the prior
written consent of Buyer, none of the Crown Parties will:

           (a)   make any material change in the business policies or practice
of the Crown Communications Business (including any advertising, marketing,
pricing, purchasing, personnel or sales policy or practice) except in the
ordinary course of business consistent with past practice;

           (b)   engage in any forward selling or acceleration of customer
orders or contracts, any deferral in paying payables, any deferral in making
capital expenditures or any delay in any construction or other capital projects,
any grant of any discount to customers other than in the ordinary course of
business consistent with past practice or any other changes intended to increase
the current income and cash collection of the Crown Communications Business
prior to the Closing Date by accelerating revenue that would otherwise be
collected after the Closing Date or deferring payment that would otherwise be
expected to be made prior to the Closing Date;

           (c)   in the case of Network or Mobile, declare, set aside or pay any
dividend or other distribution with respect to any shares of capital stock of
Network or Mobile, or repurchase, redeem or otherwise acquire any amount of
outstanding shares of capital stock or other equity securities of, or other
ownership interests in, Network or Mobile, other than declaration of a dividend
with respect to the outstanding shares of Network Common Stock in the amount of
$525,687.50 per share (or an aggregate amount of $1,051,375), which dividend
will be payable on October 31, 1997, to holders of record of Network Common
Stock as of August 14, 1997;

           (d)   issue, sell, transfer, pledge, or otherwise dispose of or
encumber any shares of, or securities convertible into or exchangeable for, or
options, warrants, calls, commitments or acquisition rights of any kind with
respect to any shares of, capital stock of any class or series of Network or
Mobile;

           (e)   in the case of Network or Mobile, amend any term of any
outstanding security of Network or Mobile;

           (f)   (x) incur or assume any indebtedness for borrowed money other
than under existing credit facilities in the ordinary course of business
consistent with past practice (but in any event not more than an aggregate
amount of additional indebtedness, to be agreed upon by Buyer and Sellers, in
excess of the aggregate amounts reflected on the Crown Interim Financial
Statements), or (y) guarantee, endorse or otherwise incur or assume (whether
directly, contingently or otherwise) liability for the obligations of any other
Person, other than in the ordinary course of business consistent with past
practice;

           (g)   create or assume any Lien on any material asset of the Crown
Communications Business, Network or Mobile other than Crown Permitted Liens,
Crown 

                                      -48-
<PAGE>
 
Permitted Real Estate Liens, and Liens incurred under existing credit facilities
or in the ordinary course of business consistent with past practice;

           (h)   make any loan, advance (other than to employees for business
expenses, consistent with past practice) or capital contribution to or
investment in any Person;

           (i)   (x) enter into any Contract relating to any acquisition or
disposition of, or the lease, mortgage or pledge of, any assets or business of
any Person, except in the ordinary course of business consistent with past
practice or as required to comply with Section 7.1(o) hereof, or (y) agree to
any modification, amendment, assignment, termination or relinquishment of any
Contract, License or other right (including any insurance policy naming it as a
beneficiary or a loss payable payee) that would have or reasonably be expected
to have a Crown Material Adverse Effect, other than in the ordinary course of
business consistent with past practice and those contemplated by this Agreement;

           (j)   change any method of accounting or accounting principles or
practice relating to the Crown Communications Business, Network or Mobile,
except for any such change required by reason of a change in GAAP;

           (k)   make or change any Tax election, change any annual Tax
accounting period, adopt or change any method of Tax accounting, file any
amended return, enter into any closing agreement, settle any Tax claim or
assessment, surrender any right to claim a Tax refund, fail to make any Tax
payments or consent to extend or waive the limitations period applicable to any
Tax claim or assessment;

           (l)   (w) grant any severance or termination pay to any director,
officer or employee of the Crown Communications Business, Network or Mobile, (x)
enter into any employment, deferred compensation or other similar agreement (or
any amendment to any such existing agreement) with any director, officer or
other employee of the Crown Communications Business, Network or Mobile, (y)
increase benefits payable under any existing severance or termination pay
policies or employment agreements, or (z) increase compensation, bonuses or
other benefits payable to directors, officers or employees of the Crown
Communications Business, Network or Mobile except, with respect to clauses (w)
or (z) pursuant to Crown Benefit Plans in existence on July 11, 1997;

           (m)   adopt any changes to the articles of incorporation or by-laws
of Network or Mobile;

           (n)   adopt any plan or agreement of complete or partial liquidation,
dissolution, merger, consolidation, restructuring, recapitalization or other
material reorganization of the Crown Communications Business, Network or Mobile;

           (o)   fail to make any material capital expenditures necessary to
maintain the existing business of the Crown Communications Business, Network and
Mobile;

           (p)   enter into any Contract or transaction with any Affiliate or
Related Person of any of the Crown Parties;

                                      -49-
<PAGE>
 
           (q)   enter into or amend any Benefit Plan other than as required by
law; or

           (r)   agree in writing or otherwise to take any of the actions
specified in this Section 7.1.

     7.2.  Consents.  Without limiting the provisions of Section 9.3 hereof, the
           --------
Crown Parties shall use commercially reasonable efforts to obtain or cause to be
obtained prior to the Closing Date any necessary consents from any Person to the
assignment (directly or indirectly) to Buyer of any Contract, License or other
instrument and right of the Crown Parties included in the Acquired Business that
requires the consent of any third party by reason of the transactions provided
for in this Agreement, and Buyer will reasonably cooperate with the Crown
Parties in this regard, but neither the Crown Parties nor Buyer will be
obligated to make any special payment or grant any special concession to any
party. For the avoidance of doubt, the procurement of any such necessary
consents shall not be deemed to be a condition to Buyer's obligation to close
the transaction contemplated hereby.

     7.3.  Notice of Proceedings.  The Crown Parties will promptly notify Buyer
           ---------------------
telephonically and in writing upon the Crown Parties' (i) becoming aware of any
order or decree or any complaint praying for an order or decree restraining or
enjoining the consummation of this Agreement or the transactions contemplated
hereunder or (ii) receiving any notice from any Governmental Entity of its
intention (x) to institute an investigation into, or institute a suit or
proceeding to restrain or enjoin, the consummation of this Agreement or such
transactions or (y) to nullify or render ineffective this Agreement or such
transactions if consummated.

     7.4.  No Solicitation.  From July 11, 1997 through the Closing Date or the
           ---------------
earlier termination of this Agreement in accordance with its terms, none of the
Crown Parties shall, nor shall any of the Crown Parties authorize or permit any
Representative of any of the Crown Parties to, directly or indirectly solicit,
initiate, encourage or participate in any discussions or negotiations with, or
furnish any information or assistance to, or afford access to the properties,
books and records or employees of the Crown Communications Business, Network or
Mobile to, any Person or group (other than Buyer or its Representatives)
concerning any merger, sale of securities, sale of substantial assets or similar
transaction involving any of the Crown Parties. Without limiting the foregoing,
it is understood that any violation of the restrictions set forth in the
preceding sentence by Sellers, the Crown Communications Business, Network or
Mobile, or any Representative of Sellers, Network or Mobile, whether or not such
Person is purporting to act on behalf of any of Seller, the Crown Communications
Business, Network or Mobile, shall be deemed to be a breach of this Section 7.4
by Sellers.

     7.5.  Cooperation.  The Crown Parties acknowledge that Buyer intends to
           -----------
finance or refinance the acquisition of the Acquired Business by arranging for a
loan or loans from certain banks and by issuing securities in the high yield
debt market (collectively, the "Acquisition Financing"). In connection with the
                                ---------------------
Acquisition Financing, the Crown Parties shall cooperate with Buyer and aid
Buyer in consummating the Acquisition Financing, including by (a) using
commercially reasonable efforts to assist Buyer and its accountants in
obtaining, no later than July 28, 1997, audited and unaudited combined
historical financial statements for the Acquired Business meeting the
requirements of Regulation S-X for a Form S-1 registration statement with 

                                      -50-
<PAGE>
 
the audited financial statements being audited by KPMG Peat Marwick LLP; (b)
executing and delivering to KPMG Peat Marwick LLP a customary letter of
representations to enable KPMG Peat Marwick LLP to deliver its audit opinion
with respect to the audited combined financial statements referred to in clause
(a) above; (c) assisting Buyer in the preparation of a customary offering
memorandum in connection with the issuance by Buyer of securities in the high
yield debt market; (d) providing access to Buyer's Representatives at reasonable
times to information and officers and other key employees of the Crown
Communications Business, Network or Mobile for due diligence purposes in
connection with the Acquisition Financing; and (e) providing access to Buyer's
Representatives at reasonable times to prior audits, working papers and other
information related to the financial statements of the Crown Communications
Business, Network and Mobile. For the avoidance of doubt, in no event shall
Buyer's obtaining or completing the audited financial statements or financing
referred to above be deemed to constitute a condition to Buyer's obligation to
close the transactions contemplated hereby. Any information obtained by Buyer
and its Representatives pursuant to this Section 7.5 relating to the operation
of the Acquired Business or the Crown Communications Business shall be held
confidential pursuant to the Confidentiality Agreement referred to in Section
14.14 hereof; provided, however, that Buyer and its Representatives may disclose
              --------  -------
such information as is reasonably necessary to complete the Acquisition
Financing (including as is reasonably necessary to meet their disclosure
obligations in connection with the Acquisition Financing).

                                  ARTICLE 8.

                              Covenants of Buyer
                              ------------------

     Buyer covenants and agrees that from July 11, 1997 until the completion of
the Closing:

     8.1.  Operation of the Business.  From July 11, 1997 until the Closing,
           -------------------------
except as expressly provided otherwise in this Agreement, Buyer and its
Subsidiaries shall conduct, or cause to be conducted, their business in the
ordinary course consistent with past practice (including with respect to the
collection of receivables, payment of payables and other liabilities,
advertising activities, sales practices (including promotions, discounts and
concessions), capital expenditures and inventory levels, and contributions to or
accruals to or in respect of Benefit Plans). Furthermore, without limiting the
generality of the foregoing, Buyer and its Subsidiaries will (i) use reasonable
commercial efforts to (A) preserve intact their business organizations, (B) keep
available the services of their present officers and key employees, (C) continue
in full force and effect without modification all existing policies or binders
of insurance currently maintained in respect of their business, (D) preserve
their current material relationships with customers, suppliers, lenders,
creditors, employees, licensors, licensees, distributors and others with whom
Buyer or any of its Subsidiaries or CTSH or any of its Subsidiaries has a
material business or financial relationship, including without limitation the
BBC Agreement, (E) safeguard the inventory of Buyer and its Subsidiaries from
theft or misappropriation and (F) maintain the books and records of Buyer and
its Subsidiaries in substantially the same manner as presently maintained and
(ii) not engage in any practice, take any action, fail to take any action or
enter into any transaction that would or would reasonably be expected to result
in any of the conditions set forth in Article 10 not being satisfied on the
Closing Date.

                                      -51-
<PAGE>
 
     In furtherance and not in limitation of the foregoing, Buyer covenants and
agrees that, prior to the Closing, without the prior written consent of the
Crown Parties, none of Buyer or its Subsidiaries will:

          (a) issue, sell, transfer, pledge or otherwise dispose of or 
encumber any shares of, or securities convertible into or exchangeable for, or
options, warrants, calls, commitments or acquisition rights of any kind with
respect to any shares of, capital stock of any class or series of Buyer or its
Subsidiaries, other than issuances pursuant to the exercise of stock-based
awards or options, including under the plans described in Section 6.13,
outstanding on July 11, 1997 and the issuance of convertible preferred stock to
investors in Buyer as contemplated in connection with transactions contemplated
hereby;

          (b) declare, set aside or pay any dividend or other distribution with
respect to any shares of capital stock of Buyer or any of its Subsidiaries or
repurchase, redeem or otherwise acquire any amount of outstanding shares of
capital stock or other equity securities of, or other ownership interests in,
Buyer or any of its Subsidiaries, other than intercompany distributions and
advances between wholly owned Subsidiaries;

          (c) enter into any Contract relating to any acquisition or 
disposition, or the lease, mortgage or pledge of, of any assets or business of
any Person that would be reasonably likely to have a Buyer Material Adverse
Effect, other than in the ordinary course of business consistent with past
practice and those contemplated by this Agreement, or amend, modify, terminate
or violate any term of the BBC Agreement;

          (d) change any method of accounting or accounting principles or 
practice, except for any such change required by reason of a change in GAAP;

          (e) adopt any changes to the certificate of incorporation or by-laws
of Buyer and similar governing instruments of its Subsidiaries;

          (f) adopt any plan or agreement of complete or partial liquidation,
dissolution, merger, consolidation, restructuring, recapitalization or other
material reorganization of Buyer or any of its Subsidiaries; or

          (g) agree in writing or otherwise to take any of the actions 
specified in this Section 8.1.


      8.2  Notice of Proceedings. Buyer will promptly notify the Crown Parties
           --------------------- 
telephonically and in writing upon Buyer (i) becoming aware of any order or
decree or any complaint praying for an order or decree restraining or enjoining
the consummation of this Agreement or the transactions contemplated hereunder or
(ii) receiving any notice from any Governmental Entity of its intention (x) to
institute an investigation into, or institute a suit or proceeding to restrain
or enjoin, the consummation of this Agreement or such transactions or (y) to
nullify or render ineffective this Agreement or such transactions if
consummated.


      8.3  Corporate Name and Symbol. On the Closing Date, Buyer will take all 
           -------------------------
necessary action such that CAC III shall adopt the name "Crown Communication
Inc.", "Crown


                                     -52-
<PAGE>
 
Communications Inc." or another name including "Crown" that is satisfactory to
Sellers and, after the Closing, CAC III shall not change its name without the
prior written consent of Sellers. Commencing as of the Closing, CAC III, the
Network Surviving Corporation, the Mobile Surviving Corporation and any other
domestic Subsidiaries of any such entity and any successor to any such entity or
such Subsidiary shall adopt and use the current Crown Symbol, to the extent
reasonably possible and permitted under applicable law.

      8.4  Liquidity Provision.  Upon receipt of a completed application, and 
           -------------------
compliance by Mr. Crown with any requirements under such application (including
a customary physical examination), Buyer shall take appropriate steps to obtain
and maintain for one year following the Closing Date, not less than $30 million
in life insurance on the life of Robert A. Crown naming Barbara Crown as
beneficiary in order to provide liquid funds to pay taxes related to the capital
stock of Buyer owned by the Crowns resulting from the death of Robert A. Crown
or both the Sellers; provided, however, that the annual premium for any such
                     --------  -------
life insurance shall not exceed $45,000.



                                  ARTICLE 9.


                        Mutual Covenants of the Parties
                        -------------------------------


     Buyer and the Crown Parties covenant and agree from July 11, 1997 until the
completion of the Closing:

      9.1  Executive Compensation. As soon as practicable after the Closing, 
           ----------------------
Buyer shall adopt, for the benefit of Robert A. Crown and other key employees
named on Schedule 9.1, a mutually acceptable modern and meaningful compensation
package containing appropriate base salary, short-term incentives, long-term
incentives, pensions, group term life and medical insurance and other forms of
compensation comparable to those offered by other companies of comparable size
in the same or similar businesses. Prior to the Closing, Buyer shall provide to
Robert A. Crown a detailed summary of such proposed compensation package. In his
capacity as Chief Executive Officer, Robert A. Crown shall make the
recommendations to the compensation committee or Board of Directors of Buyer, as
applicable, regarding compensation packages for the benefit of employees of
Crown Communications Inc.


      9.2  Hart-Scott-Rodino. As soon as possible (but in no event later than 
           -----------------
five business days) after July 11, 1997, the parties shall prepare and file all
documents with the Federal Trade Commission and the United States Department of
Justice as are required to comply with the Hart-Scott-Rodino Act, and shall
request early termination of the waiting period under the Hart-Scott-Rodino Act.
The parties will furnish promptly all materials thereafter requested by any
Governmental Entity having jurisdiction over such filings. The parties shall
keep each other fully informed of the status of the Hart-Scott-Rodino Act filing
and any other filings made to a Governmental Entity in connection with the
transactions contemplated in this Agreement.


      9.3  Access to Facilities, Files and Records. At the reasonable request 
           ---------------------------------------
of any party hereto and upon reasonable advance notice, the other parties will
give or cause to be given to the 


                                     -53-
<PAGE>
 
authorized Representatives of such requesting party (i) full access to all 
facilities, management personnel, property, accounts, books, deeds, title 
papers, insurance policies, licenses, agreements, contracts, commitments, logs,
records and files of every character, equipment, machinery, fixtures, 
furniture, vehicles and notes and accounts payable and receivable and (ii) all
such other information as such party may reasonably request; provided, however,
                                                             --------  -------
that parties shall not be required to permit such access or provide such
information to the extent it unreasonably interferes with the operation of the
party's business or such information is subject to a binding confidentiality
agreement with a third party.

      9.4  Advice of Changes. Each party will give written notice to the other
           -----------------
parties promptly upon its learning of (i) the occurrence of any event that would
or would be reasonably expected to cause or constitute a material breach had
such event occurred or been known to such party prior to July 11, 1997, of any
of such party's representations or warranties contained in this Agreement or in
any disclosure schedule to this Agreement, or of a Crown Material Adverse Effect
or a Buyer Material Adverse Effect, as the case may be, or (ii) any attempted
unionization of employees of such party.


      9.5  Consummation of Agreement. Subject to the provisions of Section 14.1
           -------------------------
of this Agreement, each of the parties hereto will use all reasonable efforts to
fulfill and perform all conditions and obligations required on its part to be
fulfilled and performed under this Agreement, and to cause the transactions
contemplated by this Agreement to be carried out.


      9.6  No Solicitation of Employees.
           ---------------------------- 

           (a) For a period of two years after July 11, 1997 or until the 
earlier consummation of the Mergers, neither Buyer nor any of its Subsidiaries
will, nor will Buyer cause CTSH or any of its Subsidiaries to, directly or
indirectly, solicit or hire any employee of the Crown Communications Business,
Network or Mobile.

           (b) For a period of two years after July 11, 1997 or until the 
earlier consummation of the Mergers, none of the Crown Parties will, directly or
indirectly, solicit or hire any employee of the Buyer, CTSH or any of their
respective Subsidiaries.


      9.7  Standstill.
           ---------- 

          (a) Buyer acknowledges that Sellers have provided certain highly 
sensitive and proprietary information to Buyer relating to, inter alia,
marketing plans, business strategies and methods of operations of the Crown
Parties, which, if used by Buyer in violation of the Confidentiality Agreement,
would be unfair and cause irreparable damage to the Crown Parties, for which
Crown's legal remedies would be inadequate. Accordingly, for a period of one
year from July 11, 1997, or until the earlier consummation of the Mergers,
neither Buyer nor any of its Subsidiaries will, directly or indirectly, engage
in, or provide any financial assistance to, or make any investment in any
business engaging in any wireless communications site acquisition, ownership,
design, development, construction, management and servicing, including broadcast
and telecommunications tower and rooftop facilities ("Restricted Activities")
                                                      ---------------------
conducted in any service area (or any portion thereof) in Pennsylvania, West
Virginia, Ohio or Kentucky served by 

                                     -54-
<PAGE>
 
the Crown Parties as of July 11, 1997 (the "Crown Territory"); provided, 
                                            ---------------             
however, that the prohibitions against Restricted Activities by Buyer set forth
in this Section 9.7(a) shall not apply to any Restricted Activities directly
related to or arising from existing contractual arrangements and certain
contractual negotiations between Buyer and NEXTEL with respect to Restricted
Activities within the Commonwealth of Kentucky, such contractual arrangements
and negotiations having been entered into prior to July 11, 1997.

          (b) Sellers acknowledge that Buyer has provided certain highly 
sensitive and proprietary information to Seller relating to, inter alia,
marketing plans, business strategies and methods of operations of the Buyer and
its Subsidiaries, which, if used by Buyer in violation of the Confidentiality
Agreement, would be unfair and cause irreparable damage to the Buyer, for which
Buyer's legal remedies would be inadequate. Accordingly, for a period of one
year from July 11, 1997 or until the earlier consummation of the Mergers, none
of the Crown Parties will, directly or indirectly, engage in, or provide any
financial assistance to, or make any investment in any business engaging in the
any Restricted Activities conducted in any service area (or any portion thereof)
in Arizona, Colorado, Mississippi, Nevada, New Mexico, North Dakota, Oklahoma,
Puerto Rico or Texas served by the Buyer or its Subsidiaries as of July 11,
1997.


      Notwithstanding the foregoing, Buyer or any of its Subsidiaries may (i) 
acquire stock or assets of a business ("New Business") that is engaged in
                                        ------------
Restricted Activities in the Crown Territory, provided that the Restricted
Activities conducted by such New Business in the Crown Territory account for
less than 10% of the annual gross revenues of the New Business and less than 10%
of the total asset value of such New Business, and provided further, that in
each such case the Buyer or its Subsidiaries, or such New Business shall, within
one (1) month of such acquisition, offer to sell to Sellers the portion of such
New Business conducted in the Crown Territory upon the same price and other
terms paid by Buyer for such portion of the New Business. In the event that
Buyer is unable to allocate the consideration paid for the New Business to that
portion thereof conducted in the Crown Territory, then Buyer and Sellers shall
use commercially reasonable efforts to agree upon an acceptable price therefor.

          (c) Notwithstanding the consummation of the Mergers, the provisions of
Sections 9.7(a) and (b) shall be reinstated and become effective as to all the
parties if the Sellers exercise their rights under Section 11 of the Pledge
Agreement by and among Robert A. Crown, Barbara Crown and Castle Tower Holding
Corp. dated August 14, 1997 (the "Pledge Agreement") to take control of all
                                  ----------------                         
Collateral (as that term is defined in the Pledge Agreement) and the proceeds
thereof.


                                  ARTICLE 10.


              Conditions to the Obligations of the Crown Parties
              --------------------------------------------------


     The obligations of the Crown Parties to consummate the transactions
contemplated by this Agreement are subject to the satisfaction (or waiver by the
Crown Parties) of the following conditions:



                                     -55-
<PAGE>
 
      10.1  No Buyer Material Adverse Effect; Representations and Warranties and
            --------------------------------------------------------------------
Covenants.
- --------- 

            (a) No event or events shall have occurred since July 11, 1997 
which, individually or in the aggregate, has had or is reasonably likely to
result in a Buyer Material Adverse Effect.

            (b) Each of Buyer, CAC I and CAC II shall have performed in all 
material respects all of its obligations and complied in all material respects
with all of its covenants hereunder required to be performed or complied with by
it at or prior to the Closing and the representations and warranties of each of
Buyer, CAC I and CAC II contained in this Agreement qualified as to materiality
shall be true and correct, and those not so qualified shall be true and correct
in all material respects, as of the Closing Date, as if made at and as of such
date, except for those representations and warranties that address matters only
as of a particular date (in which case such representations and warranties
qualified as to materiality shall be true and correct, and those not so
qualified shall be true and correct in all material respects, on and as of such
date).

      10.2  Proceedings. Neither the Crown Parties nor Buyer, CAC I or CAC II 
            -----------
shall (a) be subject to any restraining order or injunction restraining or
prohibiting the consummation of the transactions contemplated hereby and (b)
have received written notice from any Governmental Entity of its intention to
institute any action or proceeding seeking to restrain, enjoin or nullify this
Agreement or the transactions contemplated hereby.


      10.3  Hart-Scott-Rodino. The applicable waiting period imposed by the 
            -----------------
Hart-Scott-Rodino Act shall have expired or been terminated.


      10.4  Deliveries. Buyer shall have complied with each and every one of 
            ----------
its obligations set forth in Section 4.3.


                                  ARTICLE 11.


            Conditions to the Obligations of Buyer, CAC I and CAC II
            --------------------------------------------------------


     The obligations of Buyer, CAC I and CAC II to consummate the transactions
contemplated by this Agreement are subject to the satisfaction (or waiver by
such parties) of the following conditions:


      11.1  No Crown Material Adverse Effect; Representations, Warranties and
            -----------------------------------------------------------------
Covenants.
- --------- 

          (a) No event or events shall have occurred since July 11, 1997 which,
individually or in the aggregate, has had or is reasonably likely to result in a
Crown Material Adverse Effect.

          (b) Each of the Crown Parties shall have performed in all material
respects all of its obligations and complied in all material respects with all
of its covenants hereunder required 


                                     -56-
<PAGE>
 
to be performed or complied with by it at or prior to the Closing and the
representations and warranties of each of the Crown Parties contained in this
Agreement qualified as to materiality shall be true and correct, and those not
so qualified shall be true and correct in all material respects, as of the
Closing Date, as if made at and as of such date, except for those
representations and warranties that address matters only as of a particular date
(in which case such representations and warranties qualified as to materiality
shall be true and correct, and those not so qualified shall be true and correct
in all material respects, on and as of such date).

      11.2  Proceedings. Neither the Crown Parties nor Buyer, CAC I or CAC II 
            -----------
shall (a) be subject to any restraining order or injunction restraining or
prohibiting the consummation of the transactions contemplated hereby and (b)
have received written notice from any Governmental Entity of its intention to
institute any action or proceeding seeking to restrain, enjoin or nullify this
Agreement or the transactions contemplated hereby.


      11.3  Hart-Scott-Rodino. The applicable waiting period imposed by the 
            -----------------
Hart-Scott-Rodino Act relating to the transactions contemplated by this
Agreement shall have expired or been terminated. The applicable waiting period
imposed by the Hart-Scott-Rodino Act relating to the investment by certain of
the Investors (as defined in the Shareholder Agreement) in Buyer in shares of
convertible preferred stock in connection with the transactions contemplated by
this Agreement shall have been expired or been terminated.


      11.4  Deliveries. Each of the Crown Parties shall have complied with each
            ----------
and every one of its obligations set forth in Section 4.2.


      11.5  Robert A. Crown. Robert A. Crown shall be alive and shall have the 
            ---------------
mental and physical capacity to operate the Acquired Business as such business
is operated by him as of July 11, 1997.


      11.6  Uminski Employment Agreement. The parties and Mark A. Uminski shall
            ----------------------------
have agreed to arrangements reasonably satisfactory to Buyer relating to the
employment agreement dated as of November 1, 1996, between Network and Mark A.
Uminski.

      11.7  FCC Authorization. The Crown Parties shall have received a "special
temporary authorization" from the FCC to transfer the FCC Licenses set forth on
Schedule 5.12 (other than those listed on Schedule 1.7).


                                  ARTICLE 12.


                  Survival of Representations and Warranties
                  ------------------------------------------


      12.1  Survival. All representations and warranties contained in this 
            --------
Agreement or in any Schedule, Exhibit, certificate, agreement, document or
statement delivered pursuant hereto shall terminate on and as of the Closing.


                                     -57-
<PAGE>
 
      12.2  Indemnification. From and after the Closing, the parties shall 
            ---------------
indemnify each other as set forth below.

            (a) Indemnification by Sellers.  Sellers jointly and severally shall
                --------------------------                                      
indemnify Buyer, the Crown Communications Business, CAC I, CAC II, Network and
Mobile and each of their respective Affiliates and each of their respective
Representatives against and hold them harmless from any loss, liability, claim,
damage or expense (including reasonable legal fees and expenses) (collectively,
the "Buyer's Damages") suffered or incurred by any such indemnified party (other
     ---------------                                                            
than any relating to Taxes, for which indemnification provisions are set forth
in Section 13.4) arising from, relating to or otherwise in respect of (i) any
breach of any pre-closing covenant of Sellers contained in this Agreement, (ii)
all Excluded Liabilities other than liabilities and obligations arising under or
related to Excluded Leases and Excluded Contracts, and (iii) all obligations and
liabilities of Network and Mobile of any kind whatsoever, whether accrued,
contingent, absolute, determined, determinable or otherwise, other than any such
liabilities or obligations disclosed in Section 5.10 (b); provided, however,
                                                          --------  ------- 
that Sellers shall not have any liability under clause (i) above unless the
Buyer's Damages shall have resulted from an intentional breach or fraud on the
part of any of the Crown Parties.


            Each of Buyer, CAC I, CAC II, Network and Mobile acknowledges and 
agrees that, should the Closing occur, its sole and exclusive remedy with
respect to any and all claims relating to this Agreement and the transactions
contemplated hereby (other than matters related to the Shareholder Agreement and
other than post-Closing covenants) and the Crown Communications Business (other
than claims of, or causes of action arising from, fraud) shall be pursuant to
the indemnification provisions set forth in this Article 12. In furtherance of
the foregoing, each of Buyer, CAC I, CAC II, Network and Mobile hereby waives,
from and after the Closing, any and all rights, claims and causes of action
(other than claims of, or causes of action arising from, fraud) it may have
against Sellers and their respective Affiliates arising under or based upon any
federal, state, local or foreign statute, law, ordinance, rule or regulation or
otherwise (except pursuant to the indemnification provisions set forth in this
Article 12).

            (b) Indemnification by Buyer.  Buyer shall, and shall cause its
                ------------------------                                   
Subsidiaries to, indemnify Sellers and their respective Affiliates and each of
their respective Representatives against and hold them harmless from any loss,
liability, claim, damage or expense (including reasonable legal fees and
expenses) (collectively, "Sellers' Damages") incurred by any such indemnified
                          ----------------                                   
party, arising from, relating to or otherwise in respect of (i) any breach of
any pre-closing covenant of Buyer contained in this Agreement and (ii) all
Assumed Liabilities; provided that Buyer shall not have any liability under
clause (i) above unless the Sellers' Damages shall have resulted from an
intentional breach or fraud on the part of Buyer.


            Each of the Sellers acknowledges and agrees that, should the 
Closing occur, his or her sole and exclusive remedy with respect to any and all
claims relating to this Agreement and the transactions contemplated hereby
(other than the matters related to the Shareholder Agreement and other than 
post-closing covenants, or claims of, or causes of action arising from, fraud)
shall be pursuant to the indemnification provisions set forth in this Article
12. In furtherance of the foregoing, each of the Sellers hereby waives from and
after the Closing, any and all rights, claims and causes of action (other than
claims of, or causes of action arising from,



                                     -58-
<PAGE>
 
fraud) he or she may have against Buyer and its Affiliates arising under or
based upon any federal, state, local or foreign statute, law, ordinance, rule or
regulation or otherwise (except pursuant to the indemnification provisions set
forth in this Article 12).

            (c) Losses Net of Insurance, etc.  The amount of any loss, 
                -----------------------
liability, claim, damage, expense or Tax for which indemnification is provided
under this Article 12 or Article 13 shall be net of any amounts recovered by the
indemnified party under insurance policies with respect to such loss, liability,
claim, damage, expense or Tax (collectively, a "Loss") and shall be (i)
increased to take account of any net Tax cost incurred by the indemnified party
arising from the receipt or accrual of indemnity payments hereunder (grossed up
for such increase) and (ii) reduced to take account of any net Tax benefit
realized by the indemnified party arising from the deductibility of any such
Loss. In computing the amount of any such Tax cost or Tax benefit, the
indemnified party shall be deemed to recognize all other items of income, gain,
loss, deduction or credit before recognizing any item arising from the receipt
or accrual of any indemnity payment hereunder or the deductibility of any
indemnified Loss. Any indemnification payment hereunder shall initially be made
without regard to this paragraph and shall be increased or reduced to reflect
any such net Tax cost (including gross-up) or net Tax benefit only after the
indemnified party has actually realized such cost or benefit. For purposes of
this Agreement, an indemnified party shall be deemed to have "actually realized"
a net Tax cost or a net Tax benefit to the extent that, and at such time as, the
amount of Taxes payable by such indemnified party is increased above or reduced
below, as the case may be, the amount of Taxes that such indemnified party would
be required to pay but for the receipt or accrual of the indemnity payment or
the deductibility of such Loss, as the case may be. The amount of any increase
or reduction hereunder shall be adjusted to reflect any final determination
(which shall include the execution of Form 870-AD or successor form) with
respect to the indemnified party's liability for Taxes and payments between
Sellers and Buyer to reflect such adjustment shall be made if necessary. Any
indemnity payment under this Agreement shall be treated as an adjustment to the
Purchase Price for Tax purposes, unless a final determination (which shall
include the execution of a Form 870-AD or successor form) with respect to the
indemnified party or any of its affiliates causes any such payment not to be
treated as an adjustment to the Purchase Price for federal income Tax purposes.

            (d) Termination of Indemnification.  The obligations to indemnify 
                ------------------------------
and hold harmless a party hereto pursuant to Sections 12.2(a) and 12.2(b) shall
not terminate.

            (e) Procedures Relating to Indemnification under Article 12.  In 
                -------------------------------------------------------
order for a party (the "indemnified party") to be entitled to any
indemnification provided for under this Agreement (other than under Article 13)
in respect of, arising out of or involving a claim or demand made by any Person
against the indemnified party (a "Third Party Claim"), such indemnified party
                                  -----------------
must notify the indemnifying party in writing, and in reasonable detail, of the
Third Party Claim within 10 business days after receipt by such indemnified
party of written notice of the Third Party Claim; provided, however, that
                                                  --------  -------
failure to give such notification shall not affect the indemnification provided
hereunder except to the extent the indemnifying party shall have been actually
prejudiced as a result of such failure (except that the indemnifying party shall
not be liable for any expenses incurred during the period in which the
indemnified party failed to give such notice). Thereafter, the indemnified party
shall deliver to the indemnifying party, within five 


                                     -59-
        
<PAGE>
 
business days after the indemnified party's receipt thereof, copies of all
notices and documents (including court papers) received by the indemnified party
relating to the Third Party Claim.


     If a Third Party Claim is made against an indemnified party, the
indemnifying party shall be entitled to participate in the defense thereof and,
if it so chooses and acknowledges its obligation to indemnify the indemnified
party therefor, to assume the defense thereof with counsel selected by the
indemnifying party; provided that such counsel is not reasonably objected to by
                    --------                                                   
the indemnified party.  Should the indemnifying party so elect to assume the
defense of a Third Party Claim, the indemnifying party shall not be liable to
the indemnified party for legal expenses subsequently incurred by the
indemnified party in connection with the defense thereof.  If the indemnifying
party assumes such defense, the indemnified party shall have the right to
participate in the defense thereof and to employ counsel (not reasonably
objected to by the indemnifying party), at its own expense, separate from the
counsel employed by the indemnifying party, it being understood that the
indemnifying party shall control such defense.  The indemnifying party shall be
liable for the fees and expenses of counsel employed by the indemnified party
for any period during which the indemnifying party has failed to assume the
defense thereof (other than during the period prior to the time the indemnified
party shall have given notice of the Third Party Claim as provided above).


    If the indemnifying party so elects to assume the defense of any Third Party
Claim, all of the indemnified parties shall cooperate with the indemnifying
party in the defense or prosecution thereof.  Such cooperation shall include the
retention and (upon the indemnifying party's request) the provision to the
indemnifying party of records and information which are reasonably relevant to
such Third Party Claim, and making employees available on a mutually convenient
basis to provide additional information and explanation of any material provided
hereunder.  Whether or not the indemnifying party shall have assumed the defense
of a Third Party Claim, the indemnified party shall not admit any liability with
respect to, or settle, compromise or discharge, such Third Party Claim without
the indemnified party's prior written consent (which consent shall not be
unreasonably withheld).  If the indemnifying party shall have assumed the
defense of a Third Party Claim, the indemnified party shall agree to any
settlement, compromise or discharge of Third Party Claim which the indemnifying
party may recommend and which by its terms obligates the indemnifying party to
pay the full amount of the liability in connection with such Third Party Claim,
which releases the indemnifying party completely in connection with such Third
Party Claim and which would not otherwise adversely affect the indemnified
party.


    Notwithstanding the foregoing, the indemnifying party shall not be entitled
to assume the defense of any Third Party Claim (and shall be liable for the
reasonable fees and expenses of counsel incurred by the indemnified party in
defending such Third Party Claim) if the Third Party Claim seeks an order,
injunction or other equitable relief or relief for other than money damages
against the indemnified party which the indemnified party reasonably determines,
after conferring with its outside counsel, cannot be separated from any related
claim for money damages.  If such equitable relief or other relief portion of
the Third Party Claim can be so separated from that for money damages, the
indemnifying party shall be entitled to assume the defense of the portion
relating to money damages.  The indemnification required by 

                                     -60-
<PAGE>
 
Section 12.2(a) or 12.2(b) other than Third Party Claims shall be governed by
Section 12.2(e). All Tax Controversies as defined in Section 13.3 shall be
governed by Section 13.3.

            (f) Other Claims.  In the event any indemnified party should have 
                ------------ 
a claim against any indemnifying party under Section 12.2(a) or 12.2(b) that
does not involve a Third Party Claim being asserted against or sought to be
collected from such indemnified party, the indemnified party shall deliver
notice of such claim with reasonable promptness to the indemnifying party. The
failure by any indemnified party so to notify the indemnifying party shall not
relieve the indemnifying party from any liability which it may have to such
indemnified party under Section 12.2(a) or 12.2(b), except to the extent that
the indemnifying party demonstrates that it has been materially prejudiced by
such failure. If the indemnifying party does not notify the indemnified party
within 10 business days following its receipt of such notice that the
indemnifying party disputes its liability to the indemnified party under Section
12.2(a) or 12.2(b), such claim specified by the indemnified party in such notice
shall be conclusively deemed a liability of the indemnifying party under Section
12.2(a) or 12.2(b) and the indemnifying party shall pay the amount of such
liability to the indemnified party on demand or, in the case of any notice in
which the amount of the claim (or any portion thereof) is estimated, on such
later date when the amount of such claim (or such portion thereof) becomes
finally determined. If the indemnifying party has timely disputed its liability
with respect to such claim, as provided above, the indemnifying party and the
indemnified party shall proceed in good faith to negotiate a resolution of such
dispute, and, if not resolved through negotiations, such dispute shall be
resolved by litigation in an appropriate court of competent jurisdiction.

            (g) Mitigation.  Buyer and Sellers shall cooperate with each other 
                ----------
with respect to resolving any claim or liability with respect to which one party
is obligated to indemnify the other party hereunder, including by making
commercially reasonable efforts to mitigate or resolve any such claim or
liability; provided that such party shall not be required to make such efforts
           --------                                                           
if they would be detrimental in any material respect to such party.  In the
event that Buyer or Sellers shall fail to make such commercially reasonably
efforts to mitigate or resolve any claim or liability, then (unless the proviso
to the foregoing covenant shall be applicable) notwithstanding anything else to
the contrary contained herein, the other party shall not be required to
indemnify any Person for any loss, liability, claim, damage or expense that
could reasonably be expected to have been avoided if Buyer or Sellers, as the
case may be, had made such efforts.


                                  ARTICLE 13


                              Tax-Related Matters
                              -------------------


     13.1.  Closing of Tax Year. The Crown Parties and Buyer hereby 
            -------------------
acknowledge that, effective as of the Closing Date, each of Network and Mobile
will cease to be an S corporation under the Code. As a result, each of Network's
and Mobile's taxable years as an S corporation will terminate as of the Closing
Date, and such corporations will be required to file Federal income tax returns
and various state income and franchise tax returns for the period beginning
January 1, 1997 and ending on the earlier to occur of December 31, 1997 and the
date prior to the Closing Date, and, if the Closing does not occur prior to
December 31, 1997, the period 


                                     -61-
<PAGE>
 
commencing January 1, 1998 and ending on the date prior to the Closing Date (the
"Final S Tax Period(s)"). Each of the Crown Parties and Buyer hereby agree that
Network and Mobile each shall be treated as an S corporation for Federal income
tax purposes, and by all states and localities listed on Schedule 5.23(c), for
the Final S Tax Period(s).


     13.2  Filing of Tax Returns.
           --------------------- 

           (a) The Crown Parties shall, at their sole expense, cause Habib &
Associates to prepare all Tax returns required to be filed by Network and/or
Mobile or with respect to the Crown Communications Business for any taxable
period which ends prior to the Closing Date or on the Closing Date and any Tax
return with respect to the Crown Communications Business with respect to a
Section 1.6 Asset for any taxable period which ends prior to the date such
Section 1.6 Asset is transferred to the Buyer, including the Federal income tax
return(s) for the Final S Tax Period(s), and the various state income tax and
franchise returns for the same period(s) (each, a "Pre-Closing Tax Return");
                                                   ----------------------   
provided, however, that (i) such returns shall be prepared on a basis consistent
- --------  -------                                                               
with the intention of the parties that each of the Mergers will qualify as a
"reorganization" within the meaning of Section 368(a) of the Code (to the extent
such position is consistent with applicable law) and that the purchase of the
Crown Communications Business will be a taxable transaction, (ii) such returns
shall be prepared on a basis consistent with past practice and in a manner that
does not distort taxable income (e.g., by deferring income to a period after the
                                 ----                                           
Closing or accelerating deductions to a period prior to the Closing) and (iii)
such returns shall be submitted to Buyer no less than two weeks prior to the due
date for filing and shall not be filed without the prior written consent of
Buyer.  The parties shall use reasonable commercial efforts to promptly resolve
any disagreements as to the Pre-Closing Tax return(s).  Any remaining
disagreements will be referred to a "Big 6" accounting firm, mutually agreed
upon by Buyer and Sellers, for resolution, provided that the scope of review by
                                           --------                            
such accounting firm shall be limited to the disputed items.

           (b) All returns with respect to Taxes for a Tax Indemnification 
Period (as defined in Section 13.4), other than Pre-Closing Tax Returns, shall
be prepared by Buyer in a manner consistent with that set forth in Section
13.2(a).

           (c) The Crowns shall pay to Buyer, Network or Mobile, as Buyer may 
direct, all amounts due with respect to Pre-Closing Tax Returns or any other
return for the Tax Indemnification Period no later than two days prior to the
due date for payment with respect thereto.

           (d) Any tax refunds of Taxes of Network, Mobile or the Crown
Communications Business attributable to the Tax Indemnification Period shall be
for the account of the Crowns.  Any other tax refunds shall be for the account
of Buyer.


     13.3.  Tax Audits, Etc. The Crowns and Buyer shall promptly notify each 
            ---------------
other in writing within 10 days from receipt by any of them (or Network or
Mobile, in the case of Buyer) of notice of any pending or threatened Tax audit,
determination or assessment of Network, Mobile or the Crown Communications
Business for any Tax Indemnification Period (a "Tax Controversy"); provided,
                                                ---------------    --------
however, that the failure of one party to so notify the other party of any 
- -------
<PAGE>
 
Tax Controversy shall not affect such other party's obligations hereunder except
to the extent such other party is actually prejudiced by such failure. Except as
otherwise provided in this Section 13.3, the Crowns shall have the right to
control, at their own expense, all phases of any Tax Controversy relating to a
Pre-Closing Tax Return. In connection with any such Tax Controversy, the Crowns
shall have the right to employ third-party advisors, including accountants and
attorneys, all at their own expense; provided, however, that no such third-party
                                     --------  ------- 
advisors shall be retained without the prior consent of Buyer. The Crowns shall
regularly consult with Buyer in connection with any such Tax Controversy and
shall provide reports (including copies of any and all correspondence received
by the Crowns from taxing authorities) to Buyer no less frequently than monthly
to apprise it of the status thereof. Buyer shall have the right to participate,
at its own expense, in any and all proceedings with respect to any such Tax
Controversy. Notwithstanding the foregoing, the Crowns shall have no right,
without the prior written consent of Buyer, to (A) enter into any settlement
agreement, closing agreement or other agreement in compromise with any taxing
authority in connection with a Tax Controversy, (B) file a petition in any court
in connection with a Tax Controversy (whether in the form of a claim for refund,
a challenge of an asserted deficiency or otherwise) or appeal or file to appeal
any decision of any court in connection with a Tax Controversy or (C) permit the
expiration of any period of time during which administrative or judicial relief
may be sought with respect to a Tax Controversy. Buyer shall have the right to
control, at its own expense, all phases of any Tax Controversy other than a Tax
Controversy relating to a Pre-Closing Tax Return. The Crowns shall have the same
right to participate in any such Tax Controversy as Buyer would have in a Tax
Controversy relating to a Pre-Closing Tax Return.

     13.4.  Tax Indemnification. The Crowns jointly and severally shall 
            -------------------
indemnify and hold harmless Buyer, CAC I, CAC II, Network and Mobile and their
respective affiliates from (i) (A) all liability for Taxes of Network, Mobile or
the Crown Communications Business for all taxable periods ending on or before
the Closing Date and the portion of any taxable period as of the Closing Date
where the taxable period includes (but does not end on) the Closing Date; (B)
all liability for Taxes of the Crown Communications Business incurred with
respect to a Section 1.6 Asset, for all taxable periods ending on or before the
date such Section 1.6 Asset is transferred, and the portion of any taxable
period which includes (but does not end on) such date; and (C) all liability for
Taxes of the Crown Communications Business arising out of the ownership,
operation or transfer of any Section 1.6 Asset that is transferred to BANM or
BellSouth (clauses (A), (B) and (C), collectively, the "Tax Indemnification
                                                        -------------------
Period"), (ii) (A) all liability (as a result of Treasury Regulation (S) 1.1502-
- ------
6(a) or otherwise) for Taxes of any person other than Network or Mobile which is
or has ever been affiliated with Network or Mobile or with whom Network or
Mobile has ever joined (or has ever been required to join) in filing any
consolidated, combined, unitary or aggregate return, or with respect to which
Network, Mobile or the Crown Communications Business is a transferee or a
successor, (iii) any loss, liability, claim, damage or expense attributable to
any breach of any warranty or representation contained in Section 5.23 (relating
to Taxes), or any breach by the Crown Parties of any covenant contained in this
Article 13 (relating to Taxes), (iv) all liability for Taxes arising (directly
or indirectly) as a result of or otherwise attributable to the sale of the Crown
Communications Business, the Mergers or otherwise in connection with this
Agreement or the transactions contemplated hereby, other than any transfer taxes
to the extent assumed by Buyer pursuant to Section 13.5, and (v) all liability
for 

                                     -63-
<PAGE>
 
reasonable legal, accounting, appraisal, consulting or similar fees and
expenses attributable to any item in clauses (i) through (iv) above.


     In the case of any taxable period that includes (but does not end on) the
Closing Date (or, with respect to a Section 1.6 Asset, the date such Section 1.6
Asset is transferred to the Buyer) (a "Straddle Period"):
                                       ---------------   


          (i) real, personal and intangible property Taxes ("Property Taxes") of
                                                             --------------     
Network, Mobile or the Crown Communications Business for the Straddle Period
shall be equal to the amount of such property Taxes for the entire Straddle
Period multiplied by a fraction, the numerator of which is the number of days
during the Straddle Period that are in the Pre-Closing Tax Period and the
denominator of which is the number of days in the entire Straddle Period; and


          (ii) the Taxes of Network, Mobile or the Crown Communications Business
(other than property Taxes) for the Pre-Closing Tax Period shall be computed as
if such taxable period ended as of the close of business on the Closing Date.


     13.5.  Transfer Taxes, Etc. All transfer, documentary, sales, use, 
            -------------------
registration and other such Taxes (including all applicable real estate transfer
or gains Taxes and stock transfer and sales Taxes) and the related fees
(including any penalties, interests and additions to Tax) incurred in connection
with the sale of the Crown Communications Business, the Mergers or otherwise in
connection with this Agreement or the transactions contemplated hereby shall be
paid by Buyer, and the Crowns and Buyer shall cooperate in timely preparing and
filing all Returns as may be required to comply with the provisions of such Tax
laws. The Crowns shall cooperate with Buyer to minimize, to the extent permitted
by law, the amount of any sales taxes, transfer taxes or similar taxes and fees
imposed with respect to the transactions contemplated by this Agreement,
including by utilizing any applicable sales tax exemptions for occasional sales.

     13.6.  Tax Certificate. The Crowns shall deliver to Buyer at the Closing 
            ---------------
and upon the transfer of each Section 1.6 Asset to the Buyer a duly executed and
acknowledged certificate, in form and substance acceptable to Buyer and in
compliance with the Code and Treasury Regulations, certifying such facts as to
establish that the sale of the Crown Communications Business, the Mergers and
any other transactions contemplated hereby are each exempt from withholding
under Section 1445 of the Code.


     13.7.  Tax Agreements. The Crown Parties shall cause the provisions of 
            --------------
any agreement, arrangement or practice with respect to Taxes (including any Tax
sharing agreements) between the Crowns and their affiliates other than Network
and Mobile, on the one hand, and Network, Mobile and the Crown Communications
Business on the other hand, to be terminated on or before the Closing Date.
After the Closing Date, no Person shall have any rights or obligations under any
such agreement, arrangement or practice with respect to Taxes.

     13.8.  Access to Books and Records. After the Closing Date, each party 
            --------------------------- 
shall, upon the request of the other party, in connection with the preparation
by either party of Tax returns or Tax contests and for such other purposes as
either party shall reasonably request: (i) provide to the officers and other
authorized Representatives of the requesting party full access, during 


                                     -64-
<PAGE>
 
normal business hours upon reasonable advance notice, to any and all premises,
properties, files, books, records, documents and other information of Network,
Mobile or the Crown Communications Business, (ii) cause its officers to (and in
the case of Crowns, the Crowns will) furnish to the requesting party and its
authorized Representatives any and all relevant financial, technical and
operating data and other information pertaining to Network, Mobile or the Crown
Communications Business, (iii) make available to the requesting party and its
authorized Representatives personnel to consult with such Persons and (iv) make
available for inspection and copying by the requesting party at such party's
expense true and complete copies of any documents relating to the foregoing. Any
information obtained by either party pursuant to this Section 13.8 relating to
the operation of Network, Mobile or the Crown Communications Business after (in
the case of the Crowns) or prior to (in the case of Buyer) the Closing shall be
held confidential by the requesting party to the same extent as the requesting
party is required to keep information confidential pursuant to the
Confidentiality Agreement referred to in Section 14.14 hereof. In exercising
their rights under the foregoing provisions of this Section 13.8, the requesting
party and its Representatives shall not interfere with the other party's normal
operations.


     13.9.  Allocation of Crown Value. The value of the Crown Communications 
            -------------------------
Business and the Assumed Liabilities and the Network and Mobile Common Stock
shall be mutually agreed to by Buyer and the Crowns at or prior to the Closing
Date. The parties agree that, except as otherwise provided in Section 13.5, the
sole consideration allocable to the Mergers is 1,440,000 shares of Castle B
Common Stock. Such agreed allocations shall be set forth on Schedule 13.9 to
this Agreement, and all allocations contained in such Schedule shall be used by
the parties in preparing all relevant Tax returns, information reports and other
Tax documents and forms (unless a contrary allocation is required pursuant to a
final determination of a relevant Governmental Entity).

     13.10.  Survival. Notwithstanding any other provision in this Agreement, 
             --------
this Article 13 shall survive the Closing Date and remain in force until the
expiration of the relevant statutes of limitation (including all periods of
extension, whether automatic or permissive).



                                  ARTICLE 14


                                 Miscellaneous
                                 -------------


     14.1.  Termination of Agreement. This Agreement may be terminated at any 
            ------------------------ 
time on or prior to the Closing Date (a) by the mutual consent of Sellers and
Buyer; (b) by Sellers or Buyer if the Closing has not taken place by October 31,
1997, and the party seeking to terminate this Agreement has not contributed in
any material way to the failure of the transaction to close by such date; or (c)
by Sellers, if the Buyer has not terminated the Agreement pursuant to clause (x)
of this Section 14.1, below, and Buyer fails or refuses to close the transaction
on the scheduled Closing Date notwithstanding the prior satisfaction or waiver
of all of Buyer's conditions to Closing in Article 11. In addition, this
Agreement may be terminated at any time on or prior to the Due Diligence
Completion Date (x) by Buyer, if Buyer provides a written certification to
Sellers to the effect that Buyer, in good faith, has not confirmed or determined
that it is satisfied 

                                     -65-
<PAGE>
 
in all material respects with respect to the matters referred to in clause (b)
of Section 3.1 and specifying, in reasonable detail, the reasons supporting such
certification; and (y) by Sellers, if Sellers provide a written certification to
Buyer to the effect that Sellers, in good faith, have not confirmed the matters
referred to in clause (a) of Section 3.1 and specifying, in reasonable detail,
the reasons supporting such certification. Any such certification shall be
delivered to the other party on or prior to the Due Diligence Completion Date.


     14.2.  Liabilities Upon Termination. Except for the obligations contained 
            ----------------------------
in Sections 14.3, 14.7, 14.14 and 14.16 hereof, which shall survive any
termination of this Agreement, and except as provided in the next sentence of
this Section 14.2, upon the termination of this Agreement pursuant to Section
14.1 hereof, this Agreement shall forthwith become null and void, and no party
hereto or any of its officers, directors, employees, agents, consultants or
stockholders, shall have any rights, liabilities or obligations hereunder or
with respect hereto. If this Agreement is terminated (a) by Buyer pursuant to
clause (x) of Section 14.1 or by Buyer or Sellers pursuant to clause (a) or (b)
of Section 14.1, then Sellers shall forthwith return to Buyer the Advance
Payment (and any interest or earnings thereon); (b) by Sellers pursuant to
clause (c) of Section 14.1, then Sellers shall retain the Advance Payment (and
any interest or earnings thereon) as liquidated damages; or (c) by Sellers
pursuant to clause (y) of Section 14.1, then Sellers shall retain one-half of
the Advance Payment (together with one-half of any interest or earnings thereon)
as liquidated damages, and shall forthwith return to Buyer the remaining one-
half of the Advance Payment (together with one-half of any interest or earnings
thereon).


     14.3.  Expenses. Each party hereto shall bear all its expenses incurred 
            --------
in connection with the transactions contemplated in this Agreement, including
accounting, legal and financial advisory fees incurred in connection herewith;
provided, however, that (i) Buyer shall pay in the first instance any 
- --------  -------
Hart-Scott-Rodino filing fees required to be paid in connection with the Hart-
Scott-Rodino applications of both Buyer and Sellers referred to in Section 9.2
hereof, and at Closing the Crown Parties shall reimburse Buyer for 50% of all
such Hart-Scott-Rodino filing fees promptly upon presentation by Buyer of
appropriate supporting documentation with respect thereto, (ii) the Buyer shall
pay any sales or transfer taxes arising from the transfer of the Acquired
Business to Buyer as provided in Section 13.5, and (iii) Buyer shall pay the
cost of any reasonable and customary title insurance which Buyer elects to
obtain with respect to any interest in Real Property included in the Acquired
Business.

     14.4.  Bulk Sales Laws. Buyer hereby waives compliance with the provisions
            ---------------
of any applicable bulk sales law, and Buyer agrees to indemnify and hold Sellers
harmless from all claims made by creditors with respect to non-compliance with
any bulk sales law.


     14.5.  Assignments. No party hereto may assign any of its rights or 
            -----------
delegate any of its duties hereunder without the prior written consent of the
other parties, and any such attempted assignment or delegation without such
consent shall be void, except that Buyer may assign any or all of its rights
(but not its obligations) hereunder to CAC III.

     14.6.  Further Assurances. From time to time prior to, at and after the 
            ------------------ 
Closing Date, each party hereto will execute all such instruments and take all
such actions as any other party, being advised by counsel, shall reasonably
request in connection with carrying out and 


                                     -66-
<PAGE>
 
effectuating the intent and purpose hereof and all transactions and things
contemplated by this Agreement, including the execution and delivery of any and
all confirmatory and other instruments in addition to those to be delivered on
the Closing Date, any and all actions which may reasonably be necessary or
desirable to complete the transactions contemplated hereby.


     14.7.  Public Announcement. Prior to the Closing Date, no party shall, 
            -------------------
without the approval of the others, make any press release or other public
announcement concerning the transactions contemplated by this Agreement, except
as and to the extent that such party shall be so obligated by law, in which case
such party shall give advance notice to the other parties and the parties shall
use all reasonable efforts to cause a mutually agreeable release or announcement
to be issued.


     14.8.  Notices. Notices and other communications provided for herein shall
            -------
be in writing (which shall include notice by facsimile transmission) and shall
be delivered or mailed (or if by facsimile communications equipment of the
sending party hereto, delivered by such equipment), addressed as follows:


                   If to any of the Crown Parties:

                           Mr. and Mrs. Robert A. Crown
                           c/o Crown Communications
                           Penn Center West III
                           Suite 229
                           Pittsburgh, PA  15276
                           Facsimile No.:  412-788-0908



                   with a copy to:

                           Kirkpatrick & Lockhart LLP
                           1500 Oliver Building
                           Pittsburgh, Pennsylvania 15222-2312
                           Facsimile No.: (412) 355-6501


                           Attention:  Charles J. Queenan, Jr., Esq.


                   If to Buyer, CAC I or CAC II:


                           Castle Tower Holding Corp.
                           510 Bering Drive, Suite 310
                           Houston, Texas 77057
                           Facsimile No.: (713) 974-1926


                           Attention:  David L. Ivy


                                     -67-
<PAGE>
 
                   with a copy to:
   
                           Cravath, Swaine & Moore
                           Worldwide Plaza
                           825 Eighth Avenue
                           New York, NY  10019
                           Facsimile No.: (212) 474-1000


                           Attention:  Susan Webster, Esq.

or to such other address as a party may from time to time designate in writing
in accordance with this Section 14.8.  All notices and other communications
given to any party hereto in accordance with the provisions of this Agreement
shall be deemed to have been given on the date of receipt.


     14.9.  Captions. The captions of Articles and Sections of this Agreement 
            --------
are for convenience only and shall not control or affect the meaning or
construction of any of the provisions of this Agreement.


     14.10.  Governing Law. This Agreement shall be governed by, construed, and
             -------------
enforced in accordance with the laws of the Commonwealth of Pennsylvania without
regard to conflict of laws principles.


     14.11.  Waiver of Provisions. The terms, covenants, representations, 
             -------------------- 
warranties and conditions of this Agreement may be amended, modified of waived
only by a written instrument executed by the party sought to be bound thereby.
The failure of any party at any time or times to require performance of any
provision of this Agreement shall in no manner affect the right of such party at
a later date to enforce the same. No waiver by any party of any condition or the
breach of any provision, term, covenant, representation or warranty contained in
this Agreement, whether by conduct or otherwise, in any one or more instances
shall be deemed to be or construed as a further or continuing waiver of any such
condition or of the breach of any other provision, term, covenant,
representation or warranty of this Agreement.

     14.12.  Counterparts. This Agreement may be executed in several 
             ------------ 
counterparts, and all counterparts so executed shall constitute one agreement,
binding on the parties hereto, notwithstanding that the parties are not
signatory to the same counterpart.


     14.13.  Entire Agreement. This Agreement and the Confidentiality Agreement
             ----------------
referenced in Section 14.14, including the Schedules, Exhibits and Annexes
hereto, constitute the entire Agreement between the parties and supersede and
cancel any and all prior agreements between them relating to the subject matter
hereof.


     14.14.  Confidentiality. All information provided to Buyer or its 
             ---------------
Representatives by or on behalf of Sellers or their affiliates before or after
July 11, 1997 concerning the business, assets, liabilities and operations of
Sellers, the Acquired Business or the Crown Communications Business shall be
governed by the Confidentiality Agreement dated as of June 27, 1997, heretofore
executed by Buyer and the Crown Parties. All information provided to the Crown


                                     -68-
<PAGE>
 
Parties or their respective Representatives by or on behalf of Buyer or its
affiliates before or after July 11, 1997 concerning the business, assets,
liabilities and operations of Buyer and its Subsidiaries and affiliates shall be
governed by the Confidentiality Agreement dated as of June 27, 1997, heretofore
executed by the Crown Parties and Buyer.


     14.15.  Submission to Jurisdiction; Waivers. Each of Buyer, CAC I, CAC II 
             -----------------------------------
and the Crown Parties hereby irrevocably and unconditionally:

             (a) submits for itself and its property in any legal action or 
proceeding relating to this Agreement, or for recognition of the enforcement of
any judgment in respect thereof, to the exclusive general jurisdiction of the
courts of the Commonwealth of Pennsylvania, the courts of the United States of
America located in the Commonwealth of Pennsylvania and appellate courts from
any of the foregoing;

             (b) consents that any such action or proceeding may be brought in
such courts, and waives any objection that it may now or hereafter have to the
venue of any such action or proceeding in any such court or that such action or
proceeding was brought in an inconvenient court and agrees not to plead or claim
the same; and

             (c) agrees that service of process in any such action or 
proceeding may be effected by mailing a copy thereof by registered or certified
mail (or any substantially similar form of mail), postage prepaid, to such party
at its address as provided in Section 14.8 hereof.


     14.16.  Brokers or Finders. Each party agrees to indemnify and hold the 
             ------------------ 
other harmless from and against any and all claims, liabilities, or obligations
with respect to any other fees, commissions or expenses asserted by any Person
on the basis of any act or statement alleged to have been made by the other
party or its Affiliates.


     14.17.  Specific Performance. The parties hereto agree that irreparable 
             --------------------
damage would occur in the event any provision of this Agreement was not
performed in accordance with the terms hereof and that the parties shall be
entitled to an injunction or injunctions to prevent breaches of this Agreement
and to enforce specifically the term and provisions of this Agreement in any
courts of the Commonwealth of Pennsylvania or any courts of the United States of
America located in the Commonwealth of Pennsylvania, in addition to any other
remedy to which they are entitled at law or in equity.


     14.18.  Definitions; Construction. 
             -------------------------

             (a) As used herein, the following terms shall have the following 
meanings:


             "Affiliate" means, with respect to any specified Person, any 
              --------- 
other Person directly or indirectly controlling or controlled by or under the
direct or indirect common control with such specified Person. Without limiting
the generality of the foregoing, for purposes of this Agreement, CTSH and its
Subsidiaries shall each be deemed to be an Affiliate of Buyer.


                                     -69-
<PAGE>
 
     "Person" means an individual, a corporation, a limited liability company, a
      ------                                                                    
partnership, a joint venture, a business association, a trust or any other
entity or organization, including a Governmental Entity.


     "Representative" when used with respect to any Person means any directors,
      --------------                                                           
officers, employees, stockholders, agents or representatives (including
attorneys, accountants, consultants, banks and financial advisors) of such
Person.


     "Subsidiary" when used with respect to any Person means any other Person,
      ----------                                                              
whether incorporated or unincorporated, of which at least a majority of the
securities or other interests having by their terms ordinary voting power to
elect at least a majority of the board of directors or others performing similar
functions with respect to such corporation or other organization is directly or
indirectly owned or controlled by such Person or by any one or more of its
Subsidiaries.

     (b) The definitions in this Agreement shall apply equally to both the
singular and plural forms of the terms defined.  Whenever the context may
require, any pronoun shall include the corresponding masculine, feminine and
neuter forms.  The words "include," "includes" and "including" shall be deemed
to be followed by the phrase "without limitation."  All references herein to
Articles, Sections, Exhibits and Schedules shall be deemed references to
Articles and Sections of, and exhibits and Schedules to, this Agreement unless
the context shall otherwise require.


     14.19.  No Third Party Beneficiaries. This Agreement is not intended to 
             ----------------------------
confer upon any Person other than the parties hereto and their respective
successors and assigns any rights or remedies hereunder.

                                     -70-
<PAGE>
 
     IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed by their duly authorized officers, all as of the day and year first
above written.


                                         ROBERT A. CROWN,


                                         /s/ ROBERT A. CROWN
                                         ------------------------------------
                                         Individually and as a shareholder of 
                                         Network and Mobile



                                         /s/ ROBERT A. CROWN
                                         ------------------------------------  
                                         Robert A. Crown, d/b/a Crown 
                                         Communications



                                         BARBARA CROWN,

                                         /s/ BARBARA CROWN
                                         ------------------------------------
                                         Individually and as a shareholder of 
                                         Network and Mobile


 
                                         Barbara Crown, d/b/a Crown 
                                         Communications


                                         CROWN NETWORK SYSTEMS, INC.,


                                         By: /s/ ROBERT A. CROWN
                                            ----------------------------------
                                            Name:  Robert A. Crown
                                            Title: Chief Executive Officer and
                                                   President



                                         CROWN MOBILE SYSTEMS, INC.,


                                         By: /s/ ROBERT A. CROWN
                                            ---------------------------------
                                            Name:  Robert A. Crown
                                            Title: Chief Executive Officer and
                                                   President



                                     -71-
<PAGE>
 
                                         CASTLE TOWER HOLDING CORP.,


                                         By: /s/ DAVID L. IVY
                                            ---------------------------------
                                            Name:  David L. Ivy
                                            Title:  President



                                         CASTLE ACQUISITION CORP. I



                                         By: /s/ DAVID L. IVY
                                            ---------------------------------
                                            Name:  David L. Ivy
                                            Title:  Vice President


                                         CASTLE ACQUISITION CORP. II


                                         By: /s/ DAVID L. IVY
                                            --------------------------------- 
                                            Name:  David L. Ivy
                                            Title:  Vice President







                                     -72-

<PAGE>
 
                                                                     Exhibit 2.3

                           STOCK PURCHASE AGREEMENT
                           ------------------------


          THIS STOCK PURCHASE AGREEMENT ("Agreement") is entered into effective
                                          ---------                            
as of May 12, 1997, by and between Castle Tower Holding Corp., a Delaware
corporation ("Buyer"), Bruce W. Neurohr ("B. Neurohr"), Charles H. Jones
              -----                       ----------                    
("Jones"), Ronald J. Minnich ("Minnich"), Ferdinand G. Neurohr ("F. Neurohr")
  -----                        -------                           ----------  
and Terrel W. Pugh ("Pugh").
                     ----   

                                    RECITALS
                                    --------

          WHEREAS, Buyer desires to acquire and B. Neurohr, Jones, Minnich, F.
Neurohr and Pugh (collectively "Shareholders") desire to sell all of their stock
                                ------------                                    
in TEA Group Incorporated, a Georgia corporation ("TEA"), TeleStructures, Inc.,
                                                   ---                         
a Georgia corporation ("TeleStructures") and TeleShare, Inc., a Georgia
                        --------------                                 
corporation ("TeleShare"); and
              ---------       

          WHEREAS, Buyer and Shareholders have agreed upon the terms of the
purchase and sale of the stock of TEA, TeleStructures and TeleShare
(collectively "Target Corporations") and desire to evidence such arrangement in
               -------------------                                             
writing;

          NOW, THEREFORE, Buyer and Shareholders, for good and valuable
consideration including the covenants, agreements, representations and
warranties contained herein, agree as follows:

                                   ARTICLE I
                                   ---------

                                 STOCK INTEREST
                                 --------------

          1.1  TEA Stock.  On the terms and subject to the conditions set forth
               ---------                                                       
in this Agreement, Shareholders (other than Pugh) agree to sell and convey to
Buyer and Buyer agrees to purchase and accept from  Shareholders at the Closing
good and indefeasible title to 100% of the issued and outstanding common stock
of TEA ("TEA Stock") free and clear of any liens, security interest, claims,
         ---------                                                          
charges, restrictions or other encumbrances or adverse rights of any nature
("Encumbrances").
  ------------   

          1.2  TeleStructures Stock.  On the terms and subject to the conditions
               --------------------                                             
set forth in this Agreement, Shareholders (other than F. Neurohr and Minnich)
agree to effectively sell and convey to Buyer and Buyer agrees to effectively
purchase and accept from Shareholders at the Closing good and indefeasible title
to 100% of the issued and outstanding common stock of TeleStructures
("TeleStructures Stock") free and clear of any Encumbrances.
  --------------------                                      

          1.3  TeleShare Stock. On the terms and subject to the conditions set
               ---------------                                                
forth in this Agreement, B. Neurohr and Jones agree to sell and convey to Buyer
and Buyer agrees to purchase and accept from B. Neurohr and Jones at the Closing
good and indefeasible title to 100% of the issued and outstanding common stock
of TeleShare ("TeleShare Stock") free and clear of any Encumbrances.
               ---------------                                      
<PAGE>
 
          1.4  Further Assurances.  On the terms and subject to the conditions
               ------------------                                             
set forth in this Agreement, the parties will execute and deliver or cause to be
executed and delivered such instruments as may be reasonably requested by any
party in order to (i) transfer to Buyer good and indefeasible title in the TEA
Stock, TeleStructures Stock and TeleShare Stock free and clear of any
Encumbrances, and (ii) otherwise in order to carry out the purpose and intent of
this Agreement.

                                   ARTICLE II
                                   ----------

                                 PURCHASE PRICE
                                 --------------

          2.1  Purchase Price.  Buyer shall pay to the aggregate Shareholders in
               --------------                                                   
exchange and as consideration for (i) the TEA Stock the sum of $9,871,000.00
("TEA Purchase Price"), (ii) the TeleStructures Stock the sum of $2,500,000.00
- --------------------                                                          
("TeleStructures Purchase Price") and (iii) the TeleShare Stock the sum of
  -----------------------------                                           
$1,000.00 ("TeleShare Purchase Price"), in accordance with Section 2.2.
            ------------------------                                   

          2.2  Payment of Purchase Price.
               ------------------------- 

               (a) Buyer shall at the Closing (as defined in Section 7.1) pay
     $5,999,000.00 of the TEA Purchase Price to Shareholders (other than Pugh)
     by bank wire transfer of funds to the account or accounts and in the
     amounts designated by Shareholders in Exhibit 2.2(a)(1).  The $2,000,000
                                           -----------------                 
     option payment pursuant to the Partnership and Stock Purchase Agreement
     dated July 31, 1996, by and between Castle Tower TTT Corporation, TEA,
     TeleStructures, B. Neurohr, Jones and F. Neurohr ("1996 Agreement") shall
                                                        --------------        
     be applied against the TEA Purchase Price.  The sum of $1,872,000.00 of the
     TEA Purchase Price shall be deferred and paid on or before the earlier of
     December 31, 1998 or the initial public offering of Buyer; provided,
     payment or payments in the aggregate amount of $560,000.00 are made on the
     deferred obligation on or before April 1, 1998.  The deferred obligation
     shall bear interest at the rate of eight percent (8%) per annum (subject to
     maximum usury limitations) and be evidenced by promissory notes ("Notes")
                                                                       -----  
     delivered at the Closing in the form attached as Exhibit 2.2(a)(2).
                                                      ----------------- 

               (b) Buyer shall at the Closing pay the TeleStructures Purchase
     Price via a reverse triangular merger ("Merger") of a subsidiary of Buyer,
                                             ------                            
     Castle Tower TTT Corporation, a Delaware corporation ("Castle TTT"), into
                                                            ----------        
     TeleStructures (TeleStructures being the surviving corporation) and the
     shareholders of TeleStructures receiving 107,142 shares of Class B stock,
     $0.01 par value per share, of Buyer and $250,018.00 in cash in exchange for
     the TeleStructures Stock.  The Merger shall be pursuant to the Agreement
     and Plan of Merger ("Merger Plan") attached as Exhibit 2.2(b).
                          -----------               -------------- 

               (c) Buyer shall at the Closing pay $1,000.00 of the TeleShare
     Purchase Price to B. Neurohr and Jones by bank wire transfer of funds to
     the account or accounts and in the amounts designated by Shareholders in
     Exhibit 2.2(c).
     -------------- 

                                       2
<PAGE>
 
                                  ARTICLE III
                                  -----------

                 REPRESENTATIONS AND WARRANTIES OF SHAREHOLDERS
                 ----------------------------------------------

          Each of the Shareholders, jointly and severally, represents and
warrants to and for the benefit of Buyer as follows:

          3.1  Organization, Qualification and Capitalization.
               ---------------------------------------------- 

               (a) TEA is a corporation organized, validly existing and in good
     standing under the laws of the State of Georgia, and it has all corporate
     power to own its properties and to carry on its business.  Except as
     specifically disclosed and described in Exhibit 3.1(a), TEA is qualified to
                                             --------------                     
     do business, and has or had, as applicable, all appropriate or necessary
     licenses in each jurisdiction or place in which the nature of its business
     (past or present) or the character of its properties (past or present)
     requires such registration or licenses, except where the failure to so
     register, qualify or maintain would not have a material adverse effect on
     TEA.  Attached hereto as Exhibit 3.1(a) is a listing of each jurisdiction
                              --------------                                  
     in which TEA is qualified to do business.

               (b) TeleStructures is a corporation organized, validly existing
     and in good standing under the laws of the State of Georgia, and it has all
     corporate power to own its properties and to carry on its business. Except
     as specifically disclosed and described in Exhibit 3.1(b), TeleStructures
                                                --------------                
     is qualified to do business, and has or had, as applicable, all appropriate
     or necessary licenses in each jurisdiction or place in which the nature of
     its business (past or present) or the character of its properties (past or
     present) requires such registration or licenses, except where the failure
     to so register, qualify or maintain would not have a material adverse
     effect on TeleStructures.  Attached hereto as Exhibit 3.1(b) is a listing
                                                   --------------             
     of each jurisdiction in which TeleStructures is qualified to do business.

               (c) TeleShare is a corporation organized, validly existing and in
     good standing under the laws of the State of Georgia, and it has all
     corporate power to own its properties and to carry on its business.  Except
     as specifically disclosed and described in Exhibit 3.1(c), TeleShare is
                                                --------------              
     qualified to do business, and has or had, as applicable, all appropriate or
     necessary licenses in each jurisdiction or place in which the nature of its
     business (past or present) or the character of its properties (past or
     present) requires such registration or licenses, except where the failure
     to so register,  qualify or maintain would not have a material adverse
     effect on TeleShare.  Attached hereto as Exhibit 3.1(c) is a listing of
                                              --------------                
     each jurisdiction in which TeleShare is qualified to do business.

          3.2  Capitalization.
               -------------- 

               (a) The authorized capital stock of TEA consists of 10,000 shares
     of common stock, $1.00 par value, of which (a) 550 shares are issued and
     outstanding

                                       3
<PAGE>
 
     and (b)  no shares are issued and held in TEA's treasury.  All of the
     issued and outstanding shares of TEA common stock are validly issued, fully
     paid and nonassessable and were not issued in violation of the preemptive
     rights of any person.  Except as set forth in Exhibit 3.2(a), each of the
                                                   --------------             
     Shareholders of TEA own, beneficially and of record, good title to all of
     such outstanding shares of TEA common stock as set forth in Exhibit 3.2(a).
                                                                 -------------- 
     There are no existing options, subscriptions, warrants, convertible
     securities, or other rights of any nature ("Options") issued, granted or
                                                 -------                     
     binding upon TEA to issue or purchase or otherwise acquire any security of
     or equity interest in TEA except as set forth on Exhibit 3.2(a).
                                                      -------------- 

               (b) The authorized capital stock of TeleStructures consists of
     10,000 shares of common stock, $1.00 par value, of which (a) 1,000 shares
     are issued and outstanding and (b)  no shares are issued and held in
     TeleStructures' treasury.  All of the issued and outstanding shares of
     TeleStructures common stock are validly issued, fully paid and
     nonassessable and were not issued in violation of the preemptive rights of
     any person.  Each of the Shareholders of TeleStructures own, beneficially
     and of record, good title to all of such outstanding shares of
     TeleStructures common stock as set forth in Exhibit 3.2(b). Except as set
                                                 --------------               
     forth in Exhibit 3.2(b) there are no existing Options issued, granted or
              -------------                                                  
     binding upon TeleStructures to issue or purchase or otherwise acquire any
     security of or equity interest in TeleStructures.

               (c) The authorized capital stock of TeleShare consists of 10,000
     shares of common stock, $1.00 par value, of which (a) 1,000 shares are
     issued and outstanding and (b)  no shares are issued and held in
     TeleShare's treasury.  All of the issued and outstanding shares of
     TeleShare common stock are validly issued, fully paid and nonassessable and
     were not issued in violation of the preemptive rights of any person.  Each
     of the Shareholders of TeleShare own, beneficially and of record, good
     title to all of such outstanding shares of TeleShare common stock as set
     forth in Exhibit 3.2(c). There are no existing Options issued, granted or
              --------------                                                  
     binding upon TeleShare to issue or purchase or otherwise acquire any
     security of or equity interest in TeleShare except as set fort in the
     TeleShare Shareholders Agreement.

          3.3  Financial Information.
               --------------------- 

               (a)  TEA has furnished to Buyer in Exhibit 3.3(a) copies of the
                                                  --------------              
     audited balance sheet of TEA as of December 31, 1996 and the related
     audited statements of income, retained earnings and cash flows of TEA for
     the year ended December 31, 1996 and (ii) the unaudited balance sheet of
     TEA as of March 31, 1997 and the related unaudited statement of income of
     TEA for the period ending March 31, 1997 ("TEA Financial Statements").  The
                                                ------------------------        
     TEA Financial Statements, including the notes thereto, have been prepared
     in accordance with general accepted account principles ("GAAP") on a
                                                              ----       
     consistent basis throughout the periods involved, and fairly present the
     statement of assets and liabilities and statements of income, retained
     earnings and cash flows of TEA as of the dates and for the periods
     indicated; provided, the unaudited TEA Financial Statements do not contain
     notes, general year end adjustments or statements of retained earnings or
     cash flow.  Except as set forth

                                       4
<PAGE>
 
     in Exhibit 3.3(a) since March 31, 1997, TEA has not incurred any material
        --------------                                                        
     obligation or liability (contingent or otherwise) which is not in the
     ordinary course of business or which is inconsistent with past business
     practices of TEA, nor has there occurred any loss or material injury to
     TEA's assets or business as the result of any fire, accident, act of God or
     public enemy, or other casualty, or any other adverse material change in
     TEA's assets or business or in the condition (financial or otherwise) of
     TEA's business.  Further, TEA is and since January 1, 1992 has been a
     corporation subject to Federal income taxation pursuant to Subchapter S of
     the Code.

          (b) TeleStructures has furnished to Buyer in Exhibit 3.3(b) attached
                                                       --------------         
     copies of (i) the unaudited Balance Sheet of TeleStructures as of December
     31, 1996 and the related unaudited statement of income of TeleStructures
     for the year ended December 31, 1996 and (ii) the unaudited balance sheet
     of TeleStructures as of March 31, 1997 and the related unaudited statement
     of income of TeleStructures for the period ending March 31, 1997
     ("TeleStructures Financial Statements"). The TeleStructures Financial
     -------------------------------------                                
     Statements, including the notes thereto, have been prepared in accordance
     with GAAP on a consistent basis throughout the periods involved, and fairly
     present the statement of assets and liabilities and statement of income of
     TeleStructures as of the dates and for the periods indicated; provided, the
     unaudited TeleStructures Financial Statements do not contain notes, general
     year end adjustments or statements of retained earnings or cash flow.
     Except as set forth in Exhibit 3.3(b) since March 31, 1997, TeleStructures
                            --------------                                     
     Financial Statements, TeleStructures has not incurred any material
     obligation or liability (contingent or otherwise) which is not in the
     ordinary course of business or which is inconsistent with past business
     practices of TeleStructures, nor has there occurred any loss or material
     injury to TeleStructures's assets or business as the result of any fire,
     accident, act of God or public enemy, or other casualty, or any other
     adverse material change in TeleStructures's assets or business or in the
     condition (financial or otherwise) of TeleStructures's business.  Further,
     TeleStructures is and always has been a corporation subject to Federal
     income taxation pursuant to Subchapter S of the Code.
 
          (c) TeleShare has furnished to Buyer in Exhibit 3.3(c) attached copies
                                                  --------------                
     of (i) the unaudited balance sheet of TeleShare as of December 31, 1996 and
     the related unaudited financial statements of income of TeleShare for the
     period ending December 31, 1996 and (ii) the unaudited balance sheet of
     TeleShare as of March 31, 1997 and the related unaudited statement of
     income of TeleShare for the period ending March 31, 1997 ("TeleShare
                                                                ---------
     Financial Statements").  The TeleShare Financial Statements have been
     --------------------                                                 
     prepared in accordance with GAAP on a consistent basis throughout the
     periods involved, and fairly present the statements of assets and
     liabilities and statement of income of TeleShare as of the dates and for
     the periods indicated; provided, the unaudited TeleShare Financial
     Statements do not contain notes, general year end adjustments or statements
     of retained earnings or cash flow.  Except as set forth in Exhibit 3.3(c)
                                                                --------------
     since March 31, 1997, TeleShare has not incurred any material obligation or
     liability (contingent or otherwise) which is not in the ordinary course of
     business or which is inconsistent with past business practices of
     TeleShare, nor has there occurred any loss or material injury to
     TeleShare's assets or business as the result

                                       5
<PAGE>
 
     of any fire, accident, act of God or public enemy, or other casualty, or
     any other adverse material change in TeleShare's asset or business or in
     the condition (financial or otherwise) of TeleShare's business.  Further,
     TeleShare is and always has been a corporation subject to Federal income
     taxation pursuant to Subchapter C of the Code.

          3.4  Absence of Specified Changes.  Except as specifically disclosed
               ----------------------------                                   
and described in Exhibit 3.4, since July 31, 1996, as to each of the Target
                 -----------                                               
Corporations there has not been any:

               (a) Transaction by a Target Corporation except in the ordinary
     course of the applicable business as conducted on that date;

               (b) Capital expenditure by a Target Corporation exceeding
     $10,000.00;

               (c) Material adverse change in the financial condition,
     liabilities, assets or business of a Target Corporation;

               (d) Destruction, damage to or loss of any assets of a Target
     Corporation (whether or not covered by insurance) that, individually or in
     the aggregate, materially and adversely affects the financial condition,
     business or assets of a Target Corporation;

               (e) Labor trouble or unrest or other event or condition of any
     character that materially and adversely affects the financial condition,
     business or assets of a Target Corporation;

               (f) Change in accounting methods or practices by a Target
     Corporation;

               (g) Revaluation (excluding normal GAAP depreciation and
     amortization and ordinary course adjustments in receivables and bad debt
     expense) by a Target Corporation of any of its assets;

               (h) Increase in the salary or other compensation payable or to
     become payable by a Target Corporation to any of its employees, or the
     declaration, payment or commitment or obligation of any kind for the
     payment by a Target Corporation of a bonus or other additional salary or
     compensation to any such persons;

               (i) Sale, transfer or lease of any asset of a Target Corporation
     except in the ordinary course of business;

               (j) Amendment or termination of any contract, agreement or
     license to which a Target Corporation is a party, except in the ordinary
     course of business;

                                       6
<PAGE>
 
               (k) Loan by a Target Corporation to any person, or guaranty by a
     Target Corporation of any loan or other obligation;

               (l) Borrowing, or incurring of debt for borrowed money, in excess
     of $ 10,000.00 by a Target Corporation;

               (m) Encumbrance of any asset of a Target Corporation;

               (n) Waiver or release of any right or claim of a Target
     Corporation, except in the ordinary course of business;

               (o) Dividend , distribution or bonus payment by a Target
     Corporation;

               (p) Other known or contemplated events or conditions of any
     character that, individually or in the aggregate, have or are likely to
     have a material adverse effect (past, present or future) on the financial
     condition, liabilities, business or assets of a Target Corporation; or

               (q) Agreement or act by a Target Corporation to do or incur any
     of the foregoing.

          3.5  Absence of Undisclosed Liabilities.  Each of the Target
               ----------------------------------                     
Corporations do not have any debt, liability or obligation of any nature,
whether accrued, absolute, contingent or otherwise, and whether due or to become
due, that is not fully and clearly reflected or reserved against in the TEA
Financial Statements, TeleStructures Financial Statements or TeleShare Financial
Statements, as applicable, or otherwise specifically disclosed and described in
Exhibit 3.5. Further, each business conducted by a Target Corporation has,
- -----------                                                               
except as described in Exhibit 3.5 been operated in compliance with all
                       -----------                                     
applicable laws, rules and regulations including without limitation, any
environmental laws other than those which do not in the aggregate or
individually materially affect such business.

          3.6  Real Property.
               ------------- 

               (a) A description of (i) all real property owned, directly or
     indirectly, by a Target Corporation (as indicated) and (ii) each lease of
     real property under which a Target Corporation (as indicated) is a lessee,
     lessor, sublessee or sublessor is attached as Exhibit 3.6.
                                                   ----------- 

               (b) Except as specifically disclosed and described in Exhibit
                                                                     -------
     3.6, as to such real property or leaseholds:

                    (i) The applicable Target Corporation is not in default with
          respect to any material term or condition of any such lease, mortgage
          or other obligations relating to such real property or leaseholds, nor
          has any event occurred that through the passage of time or the giving
          of notice, or both,

                                       7
<PAGE>
 
          would constitute a default thereunder by the applicable Target
          Corporation or would cause the acceleration of any obligation of the
          applicable Target Corporation or the creation of an Encumbrance upon
          any asset of the applicable Target Corporation.

                    (ii)  All of the real property and leasehold fixtures and
          other improvements are in good operating condition and have been
          maintained on a basis consistent with good and prudent business
          practices;

                    (iii) The applicable Target Corporation is not in violation
          of any foreign, federal, state or local laws, regulations, rules,
          ordinances or code (including laws and rules promulgated by quasi-
          governmental agencies) ("Applicable Laws") the violation of which
                                   ---------------                         
          would have a material adverse effect on such Target Corporation; and

                    (iv)  To Shareholders' knowledge and belief there is not
          constructed, deposited, stored, disposed, placed or located on any of
          the real property or leaseholds described in Exhibit 3.6 (i) asbestos
                                                       -----------             
          in any form that has become friable; (ii) urea formaldehyde foam
          insulation; (iii) transformers or other equipment that contain
          dielectric fluid containing levels of polychlorinated biphenyls in
          excess of 50 parts per million; and (iv) there are no hazardous wastes
          or substances requiring remediation under Applicable Laws. Further,
          Shareholders do not suspect there are any hazardous wastes or
          substances on such real property or leaseholds.

          3.7  Inventories.  Each of the Target Corporations have no inventory
               -----------                                                    
type assets and does not need any such assets in its business.

          3.8  Other Tangible Personal Property.  A description and the location
               --------------------------------                                 
of each item of tangible personal property owned or leased (as indicated) by
each of the Target Corporations (as indicated) with a value in excess of $1,000
is specifically described on Exhibit 3.8. A description and the location of each
                             -----------                                        
item of tangible personal property leased by each of the Target Corporations (as
indicated) with a value in excess of $1,000 is described of Exhibit 3.8.
                                                            ----------- 

          3.9  Intangible Personal Property.  Any and all interests in any
               ----------------------------                               
patent, patent application, invention disclosure, trade secret, trademark,
trademark registration, trade name, copyright, copyright registration or
application for any of the foregoing owned or held by each of the Target
Corporations are described in Exhibit 3.9.  To Shareholders' knowledge and
                              -----------                                 
belief, the conduct of the business held by each of the Target Corporations does
not conflict with or infringe upon any patents, trademarks, trade secrets,
copyrights, trade names or proprietary rights of any other person.  Shareholders
are not aware of any conduct of any third person that conflicts with or
infringes upon any patents, trademarks, trade secrets, copyrights, trade names
or proprietary rights of a Target Corporations.

                                       8
<PAGE>
 
          3.10  Title to Assets.  Each of the Target Corporations has good and
                ---------------                                               
marketable title to all of its assets, whether tangible or intangible, real,
personal or mixed, and such assets constitute all of the assets and interests in
assets that are reasonably necessary or used in the conduct of such
corporation's business as currently being conducted.  Except as specifically
contemplated by this Agreement or disclosed and described in Exhibit 3.10, all
                                                             ------------     
of the assets of each of the Target Corporations are free and clear of
Encumbrances.  Each of the Target Corporations  is in possession of all real and
personal property leased to it by other persons.

          3.11  Relationships with Suppliers and Customers.  Except as
                ------------------------------------------            
specifically disclosed and described in Exhibit 3.11, no supplier or customer of
                                        ------------                            
a Target Corporation has indicated any intention to terminate or reduce its
business with such corporation, and Shareholders are not aware that any such
suppliers or customers are contemplating the termination or a reduction of their
business with a Target Corporation.

          3.12  Labor Relations.  Except as specifically disclosed and described
                ---------------                                                 
in Exhibit 3.12:
   ------------ 

                (a) There is no unfair labor practice complaint against any of
     the Target Corporations pending before the National Labor Relations Board
     or any state or local agency, no pending labor strike or other material
     labor trouble affecting any of the Target Corporations, material labor
     grievance pending against any of the Target Corporations and no pending
     representation question respecting the employees of any of the Target
     Corporations.  None of the Target Corporations has ever experienced any
     labor dispute, strike or work stoppage since January 1, 1991.

                (b) No proceedings or claims are pending or, to the knowledge of
     the Shareholders, threatened against any of the Target Corporations with
     respect to any violation or alleged violation of Applicable Laws
     prohibiting discrimination on any basis including, without limitation, on
     the basis of race, color, religion, sex, national origin or age.

                (c) No proceedings or claims are pending or, to the knowledge
     and belief of the Shareholders, threatened against any of the Target
     Corporations with respect to any violation or alleged violation of any
     Applicable Laws relating to the employment of labor since January 1, 1991,
     including, without limitation, those related to wages, hours or collective
     bargaining. Each of the Target Corporations have complied in all material
     respects with all Applicable Laws relating to employment of labor. Each of
     the Target Corporations have made all payments and withholdings of taxes
     and other sums as required by appropriate governmental authorities and has
     withheld and paid to the appropriate governmental authorities, or is
     holding for payment not yet due to such authorities, all amounts required
     to be withheld from personnel (including former personnel) of any of the
     Target Corporations, and is not liable for any arrears of wages, taxes,
     penalties or other sums for failure to comply with any Applicable Laws
     relating to the foregoing.

                                       9
<PAGE>
 
          3.13  Employment and Compensation Arrangements.
                ---------------------------------------- 

                (a) There are no collective bargaining agreements or other labor
     agreements to which any of the Target Corporations is or was a party or by
     which it is bound.  Exhibit 3.13(a) hereto sets forth a true and complete
                         ---------------                                      
     list and description of (i) each employment, profit sharing, deferred
     compensation, bonus, pension, retainer, consulting, retirement, welfare or
     incentive plan or contract to which any of the Target Corporations is a
     party, or by which it is bound and (ii) each plan and agreement under which
     "fringe benefits" (including, but not limited to, vacation plans or
     programs, sick leave plans or programs and related benefits) are afforded
     to the personnel (including former personnel) of any of the Target
     Corporations.  Each of the Target Corporations is not in default with
     respect to any term or condition thereof, nor has any event occurred which,
     with the passage of time or the giving of notice or both, would constitute
     a default by any of the Target Corporations thereunder or would cause the
     acceleration of any obligation of any of the Target Corporations.  Exhibit
                                                                        -------
     3.13(a) also sets forth the names of all salaried employees of the Target
     -------                                                                  
     Corporations and the rate at which each such employee is compensated.
     Except as specifically shown on Exhibit 3.13(a), to the knowledge and
                                     ---------------                      
     belief of the Shareholders no employee has any claim against any of the
     Target Corporations (or any basis therefor) for any loss, cost, expense,
     damages, indemnification or liability of any kind except for accrued base
     salaries, vacation pay and reimbursement of normal business expenses.

                (b) With respect to plans of any of the Target Corporations
     described in Section 3.13(a) ("Covered Plans"), all of the following
                                    -------------                        
     statements are true and complete.

                    (i)    Each of the Target Corporations and TEA Shareholders
          have not engaged in a transaction in connection with any Covered Plan
          with respect to which any of the Target Corporations could be subject
          to either a civil penalty assessed pursuant to the Employee Retirement
          Income Security Act of 1974, as amended ("ERISA"), or the Code
                                                    -----               
          including ERISA (S)502(i) and Code (S) 4975.

                    (ii)   Except as otherwise disclosed in Exhibit 3.13(b), the
                                                            ---------------     
          Covered Plans comply in all material respects with and have been
          operated in accordance with the requirements of ERISA and Code
          including the reporting and disclosure rules and, where applicable,
          the continuation health coverage rules.  None of the Target
          Corporations shall incur any penalty, charge or other loss as a result
          of any exception set forth in Exhibit 3.13(b).
                                        --------------- 

                    (iii)  Full payment has been made through Closing Date of
          all amounts which have been required to be paid pursuant to the
          Covered Plans.

                    (iv)   None of the Target Corporations has or is involved
          with a pension plan including a multi-employer pension plan.

                                       10
<PAGE>
 
                    (v)    There are no material adverse claims, pending or
          overtly threatened, involving any Covered Plan, nor to Shareholders'
          knowledge and belief, is there any reasonable basis to anticipate any
          such claim.

               (c)  All obligations of any of the Target Corporations relating
     to its personnel (including former personnel), whether arising by operation
     of law or by contract for payments by any of the Target Corporations to
     trusts or other funds or to any governmental agency with respect to workers
     compensation, unemployment compensation, social security or any other
     benefits for its personnel with respect to employment of such persons have
     been timely paid. All obligations of each of the Target Corporations with
     respect to its personnel, whether arising by operation of law or by
     contract for salaries, vacation and holiday pay, sick pay, bonuses, other
     forms of compensation or other benefits payable to such personnel in
     respect of the services rendered have been timely paid.

          3.14 Insurance.  All of the insurance policies under which any of the
               ---------                                                       
Target Corporations or any of its assets or its personnel are insured are
disclosed and described in Exhibit 3.14.  All such policies are in full force
                           ------------                                      
and effect.  To Shareholders' knowledge and belief, each of the Target
Corporations maintain insurance in such amounts and of such character as
Shareholders reasonably believe to be adequate for the business conducted by the
Target Corporations.

          3.15 Contracts.
               --------- 

               (a) With respect to each of the leases, contracts, agreements,
     arrangements, obligations or commitments ("Contracts") to which any of the
                                                ---------                      
     Target Corporations is a party, or by which any of the Target Corporations
     or its properties are bound, and which materially affect any of the Target
     Corporations, its assets or business, except as specifically disclosed and
     described in Exhibit 3.15(a):
                  --------------- 

                   (i)   Each Contract is in full force and effect, is a valid
          and binding agreement of the applicable Target Corporation and, to the
          knowledge and belief of Shareholders, of the other parties thereto;

                   (ii)  Each of the Target Corporations has fulfilled all
          material obligations required of it pursuant to each applicable
          Contract except as to such obligations which have not been required to
          be fulfilled;

                   (iii) There is no default or event that with notice or lapse
          of time, or both, would constitute a default by any Target Corporation
          under any of the Contracts or, to the knowledge and belief of
          Shareholders by any other party to any of the Contracts; and

                   (iv)  Except as specifically disclosed and described in
          Exhibit 3.15(a),  none of the Target Corporations has received notice
          ---------------                                                      
          that any party to any of the Contracts intends to cancel or terminate
          any of the Contracts.  None

                                       11
<PAGE>
 
          of the Target Corporations is a party to, nor is any Target
          Corporation property subject to or bound by, any Contract that is
          materially adverse to the business, properties or financial condition
          of the Target Corporations assuming the terms and conditions of the
          Contract are satisfied by all parties thereto.

               (b) Except as specifically disclosed and described in Exhibit
                                                                     -------
     3.15(b), none of the Target Corporations is a party to, nor is its property
     -------                                                                    
     bound by, any Contract not entered into in the ordinary course of business
     or any Contract requiring the performance by the Target Corporations of any
     obligation for a period of time extending beyond one year from date hereof
     or calling for aggregate consideration of more than $10,000.00.

               (c) A schedule and description of all material Contracts to which
     any of the Target Corporations is a party, or by which any of the Target
     Corporations or its properties are bound is attached as Exhibit 3.15(c).
                                                             --------------- 

          3.16 Licenses.  Each of the Target Corporations has all material
               --------                                                   
licenses, franchises, permits and authorizations ("Licenses") that are necessary
                                                   --------                     
for the lawful conduct of the business of the Target Corporation, and the
material Licenses are listed on Exhibit 3.16.  Except as specifically disclosed
                                ------------                                   
and described in Exhibit 3.16, each of the Target Corporations is not in
                 ------------                                           
violation of any Applicable Laws relating to the Licenses.

          3.17 Litigation.  There is no suit, action, arbitration or legal,
               ----------                                                  
administrative or other proceeding or governmental investigation pending or, to
the knowledge and belief of Shareholders threatened or contemplated, against or
affecting a Target Corporation or any of their assets, businesses or financial
condition.  Each of the Target Corporations is not in default with respect to
any order, writ, injunction or decree of any federal, state, local or foreign
court, department, agency or instrumentality.  Each of the Target Corporations
is not currently engaged in any legal action to recover moneys due or damages
sustained by the Target Corporation, or arising out of a Target Corporation's
business.

          3.18 Agreement Not In Breach of Other Instruments.  Except as
               --------------------------------------------            
specifically disclosed and described in the Exhibit 3.18, the execution and
                                            ------------                   
delivery of this Agreement and the consummation of the transactions contemplated
herein will not result in or constitute any of the following:  (a) a default or
an event that, with the giving of notice or lapse of time, or both, would be a
default, breach or violation of the Articles of Incorporation, Bylaws or other
constituent documents of a Target Corporation or any Contract to which a Target
Corporation is a party or by which a Target Corporation or its property is
bound; (b) an event that would permit any party to terminate any Contract or to
accelerate the maturity of any indebtedness or other obligation of a Target
Corporation; or (c) the creation or imposition of any Encumbrance on any of the
properties of a Target Corporation except as specifically contemplated by this
Agreement.

          3.19 Authorization of Agreement.  Shareholders, as applicable, have
               --------------------------                                    
all the requisite right, legal capacity and authority to enter into this
Agreement, to perform its obligations hereunder and to consummate the
transactions contemplated herein.  This

                                       12
<PAGE>
 
Agreement and all other agreements, documents and instruments to be executed and
delivered in connection herewith have been effectively authorized by all
necessary action (including TeleStructures' approval and authorization to
consummate the Merger), which authorizations remain in full force and effect and
have been duly executed and delivered by Shareholders, as applicable, and no
other proceedings on the part of a Shareholder are required to authorize this
Agreement or the transactions contemplated herein (including the Merger).  This
Agreement constitutes the legal, valid and binding obligation of Shareholders,
enforceable against Shareholders in accordance with its terms, except as
enforcement may be limited by bankruptcy, insolvency, reorganization, moratorium
or similar laws or equitable principles relating to or limiting creditor's
rights generally.

          3.20 Consents and Approvals.  To Shareholders' knowledge and belief,
               ----------------------                                         
no authorization, consent or approval of any public body, authority or any third
person is necessary for Shareholders, as applicable, to transfer TEA Stock,
TeleStructures Stock or TeleShare Stock as contemplated by this Agreement and to
consummate the other transactions and transfers contemplated in this Agreement
except (including consummation of the Merger) as specifically disclosed in
Exhibit 3.20 or which have been obtained.
- ------------                             

          3.21 Brokers.  None of the Shareholders or Target Corporations have
               -------                                                       
retained any broker or finder or agreed to become obligated to pay any fee or
commission to any broker or finder for or on account of the transactions
contemplated by this Agreement except the commission or compensation due to The
Robinson-Humphrey Company, Inc. as described in Exhibit 3.21.  Shareholders
                                                ------------               
shall pay any commission or compensation due to The Robinson-Humphrey Company,
Inc. Shareholders agree to indemnify and hold and save harmless Buyer from any
claim or demand for commissions or other compensation by any broker, finder or
similar agent claiming to have been employed by or on behalf of any Shareholder
or Target Corporation.

          3.22 Prior Representation and Covenants.  The warranties and
               ----------------------------------                     
representations of Sellers and TEA Shareholders pursuant to the 1996 Agreement
were true and complete when made and except as disclosed in Exhibit 3.22 or as
                                                            ------------      
specifically permitted or contemplated by the 1996 Agreement or this Agreement,
Sellers and TEA Shareholders have performed or complied with all covenants and
agreements required to be performed by them in the 1996 Agreement.  For purposes
of this Section 3.22, "Sellers" and "TEA Shareholders" have the meaning
contained in the 1996 Agreement.

          3.23 Code Section 338 (h)(10) Election.  The Shareholders and TEA
               ---------------------------------                           
(assuming Castle also timely executes the Code Section 338(h)(10) election) can
make a valid Code Section 338(h)(10) election for TEA including execution of  a
valid IRS Form 8023-A with a Code Section 338(h)(10) election relating to TEA.
The Shareholders will be "S corporation shareholders" pursuant to Treasury
Regulation Section 1.338(h)(10)-1 as to TEA upon the filing of a Code Section
338(h)(10) election for TEA.  Except as indicated in Exhibit 3.23, TEA has no
                                                     ------------            
built-in gains which could be subject to federal taxation pursuant to Code
Section 1374 at the corporate level or income/gains which could be subject to
state taxation at the corporate level as a result of the deemed asset sale and
liquidation with a Code Section 338(h) (10) election (or similar election at the
state level).

                                       13
<PAGE>
 
          3.24  Full Disclosure.  The information provided by Shareholders to
                ---------------                                              
Buyer in this Agreement including the documents delivered pursuant hereto or
pursuant to the covenants and agreements contained in the 1996 Agreement, do not
contain any untrue statement of a material fact or omit to state a material fact
required to be stated herein or therein, or necessary to make the statements and
facts contained herein or therein, in light of the circumstances in which they
are made, not false or misleading.  Copies of all documents heretofore delivered
or made available to Buyer pursuant hereto were complete and accurate copies of
such documents.  Except with respect to (i) matters relating to cellular and
antenna and tower technology, (ii) matters relating to public and governmental
attitudes and policies with respect to cellular service and antennas and towers
and (iii) other matters that are outside the control of Shareholders, there is
no fact known to Shareholders that materially and adversely effects the
business, prospects, conditions, affairs, or operations of the Target
Corporations or any of their properties or assets that has not been fully
described in this Agreement or the Exhibits hereto.

 
                                   ARTICLE IV
                                   ----------

                         REPRESENTATIONS AND WARRANTIES
                         ------------------------------
                                    OF BUYER
                                    --------

          Buyer represents and warrants to and for the benefit of Shareholders
as follows:

          4.1   Organization, Qualification and Capitalization.
                ---------------------------------------------- 

               (a) Buyer is a corporation duly organized, validly existing and
     in good standing under the laws of the State of Delaware, and has all
     corporate power to own its properties and to carry on its business as now
     owned and operated by Buyer.  Except as specifically disclosed and
     described in Exhibit 4.1(a), Buyer is qualified to do business, and has all
                  --------------                                                
     appropriate or necessary licenses in each jurisdiction or place in which
     the nature of its business or the character of its properties require such
     registration, except where the failure to so register or qualify would not
     have a material adverse effect on Buyer.  Attached hereto as Exhibit 4.1(a)
                                                                  --------------
     is a listing of each jurisdiction in which the Buyer is qualified to do
     business.

               (b) Castle TTT is a corporation duly organized, validly existing
     and in good standing under the laws of the State of Delaware, and has all
     corporate power to own its properties and to carry on its business as now
     owned and operated by Castle TTT.  Except as specifically disclosed and
     described in Exhibit  4.1(b), Castle TTT is qualified to do business, and
                  ---------------                                             
     has all appropriate or necessary licenses in each jurisdiction or place in
     which the nature of its business or the character of its properties require
     such registration, except where the failure to so register or qualify would
     not have a material adverse effect on Castle TTT.  Attached hereto as
     Exhibit 4.1(b) is a listing of each jurisdiction in which Castle TTT is
     --------------                                                         
     qualified to do business.

                                       14
<PAGE>
 
          4.2  Authorization of Agreement.  Buyer has all the requisite right,
               --------------------------                                     
legal capacity and authority, corporate or otherwise, to enter into this
Agreement and perform its obligations hereunder and to consummate the
transactions contemplated herein.  This Agreement and all other agreements,
documents and instruments to be executed and delivered in connection herewith
have been effectively authorized by all necessary action (including Castle TTT's
approval and authorization to consummate the Merger), corporate or otherwise,
which authorizations remain in full force and effect and no other corporate
proceedings are required to authorize this Agreement or the transactions
contemplated herein (including the Merger).  This Agreement constitutes the
legal, valid and binding obligation of Buyer and is enforceable against Buyer in
accordance with its terms except as enforcement may be limited by bankruptcy,
insolvency, reorganization, moratorium or similar laws or equitable principles
relating to or limiting creditor's rights generally.

          4.3  Consents and Approvals.  To Buyer's knowledge and belief, no
               ----------------------                                      
authorization, consent, or approval of any public body, authority or any third
person is necessary for Buyer to acquire the TEA Stock, TeleStructures Stock or
TeleShare Stock as contemplated by this Agreement and to consummate the
transactions contemplated in this Agreement (including the Merger) except as
specifically disclosed and described on Exhibits attached hereto.

          4.4  Agreement Not In Breach of Other Instruments.  Except as
               --------------------------------------------            
specifically disclosed and described in Exhibit 4.4, the execution and delivery
                                       ------------                            
of this Agreement and the consummation of the transactions contemplated herein
will not result in or constitute any of the following: (a) a default or an event
that, with the giving of notice or lapse of time or both, would be a default,
breach or violation of the Articles of Incorporation or Bylaws of Buyer or any
Contract to which Buyer is a party or by which Buyer or the property of Buyer is
bound; (b) an event that would permit any party to terminate any Contract or to
accelerate the maturity of any indebtedness or other obligation of Buyer; or (c)
the creation or imposition of any Encumbrance on any of the properties of Buyer.

          4.5  Brokers.  Neither Buyer nor Castle TTT has retained any broker or
               -------                                                          
finder or agreed to become obligated to pay any fee or commission to any broker
or finder for or on account of the transactions contemplated by this Agreement.
Buyer agrees to indemnify and hold and save harmless Seller from any claim or
demand for commissions or other compensation by any broker, finder or similar
agent claiming to have been employed by or on behalf of Buyer or Castle TTT.

          4.6  Buyer Stock.  The stock of Buyer when issued to B. Neurohr, Jones
               -----------                                                      
and Pugh pursuant to the Merger will be legally and validly issued, fully paid
and nonassessable, and not in violation of the preemptive rights of any person.

          4.7  Buyer Sale or Merger.  Buyer is not currently discussing or
               --------------------                                       
negotiating the sale or merger of its business [including the business of Castle
Tower Corporation, a Delaware corporation ("CTC")] with any publicly traded
                                            ---                            
corporation.

                                       15
<PAGE>
 
                                   ARTICLE V
                                   ---------

                                   COVENANTS
                                   ---------

          5.1  Shareholders' Covenants.  Shareholders covenant and agree to do
               -----------------------                                        
the following:

               (a)  Shareholders will cooperate fully with Buyer as to
     arrangements for the transfer of the TEA Stock, TeleStructures Stock and
     TeleShare Stock to Buyer at the Closing as contemplated by this Agreement
     including consummation of the Merger.

               (b)  Shareholders will, upon request of Buyer, from time to time
     execute and deliver such further documents and instruments, and will do or
     use its best efforts to cause to be done such further acts as Buyer may
     reasonably request to more completely consummate and make effective the
     transactions contemplated hereby.

               (c)  Shareholders will promptly notify Buyer in writing if a
     Shareholder becomes aware of any material fact or condition that makes
     untrue, or shows to have been untrue, any material representation or
     warranty made by a Shareholder in this Agreement, and shall promptly notify
     Buyer of any material breach by a  Shareholder of any covenant or agreement
     in this Agreement.

          5.2  Buyer's Covenants.   Buyer covenants and agrees with
               -----------------                                   
Shareholders as follows:

               (a)  Buyer will fully cooperate with Shareholders to arrange the
     transfer of the TEA Stock, TeleStructures Stock and TeleShare Stock to the
     Buyer at the Closing as contemplated by this Agreement including
     consummation of the Merger.

               (b)  Buyer will, upon request of a Shareholder, from time to time
     execute and deliver such further documents and instruments, and will do or
     use its best efforts to cause to be done such further acts as a Shareholder
     may reasonably request to more completely consummate and make effective the
     transactions contemplated hereby.

               (c)  Buyer will promptly notify Shareholders in writing if Buyer
     becomes aware of any material fact or condition that makes untrue, or shows
     to have been untrue, any material representation or warranty made by Buyer
     in this Agreement, and shall promptly notify Shareholders of any material
     breach by Buyer of any covenant or agreement in this Agreement.

                                       16
<PAGE>
 
                                  ARTICLE VI
                                  ----------

                     CERTAIN UNDERSTANDINGS AND AGREEMENTS
                     -------------------------------------

          6.1  Security Representations.
               ------------------------ 

               (a)  Each of B. Neurohr, Jones and Pugh represents and warrants
     as to any stock or security of Buyer, he will or may acquire that (i) he is
     aware that stock and securities of Buyer issued to him will not be
     registered under the Securities Act of 1933, as amended ("Securities Act")
                                                               --------------  
     or the securities laws of any state, in reliance upon certain exemptions
     from registration, (ii) he will be acquiring such stock or securities
     solely for his account and not for the account of an other person, (iii) he
     will not be investing with the present intent of reselling, transferring or
     subdividing all or any portion of such stock or securities to any other
     person, (iv) he has adequate means of providing for current financial need
     and possible contingencies exclusive of any such investment, (v) such
     investment will be immaterial in relation to his net worth and anticipated
     earnings and (vi) he is an "accredited investor" pursuant to Regulation D
     promulgated by the Securities Exchange Commission pursuant to the
     Securities Act ("Regulation D").
                      ------------   

               (b)  Buyer represents and warrants   as to any stock or security
     of TEA, TeleStructures or TeleShare, it will or may acquire that (i) it is
     aware that stock and securities of such entities issued to it will not be
     registered under the Securities Act or the securities laws of any state, in
     reliance upon certain exemptions from registration, (ii) it will be
     acquiring such stock or securities solely for its account and not for the
     account of an other person, (iii) it will not be investing with the present
     intent of reselling, transferring or subdividing all or any portion of such
     stock or securities to any other person, (iv) it has adequate means of
     providing for current financial needs and possible contingencies exclusive
     of any such investment, (v) such investment will be immaterial in relation
     to its net worth and anticipated earnings  and (vi) it is an "accredited
     investor" pursuant to Regulation D.

          6.2  Buyer's Stockholder Agreement.  All Buyer's Class B Stock issued
               -----------------------------                                   
pursuant to the Merger is subject to the terms and conditions of the Stockholder
Agreement attached as Exhibit 6.2 ("Buyer's Stockholder Agreement").
                      --------------------------------------------- 

          6.3  Buyer and CTC Directors.  B. Neurohr and Jones will generally
               -----------------------                                      
have the right to be present at the board of directors meetings of Buyer and CTC
or their successors; provided, it is understood that the board of directors of
Buyer and CTC have certain fiduciary or confidential obligations and will have
certain fiduciary or confidential matters to discuss outside the presence of non
directors.  Further, the right of B. Neurohr and Jones to be present at board of
directors meetings of Buyer and CTC pursuant to this Section 6.3 shall terminate
upon a public offering by Buyer or Buyer becoming part of a publicly traded
group.

          6.4  [Reserved].

                                       17
<PAGE>
 
          6.5  Nondisclosure of Confidential Information.
               ------------------------------------------

               (a)  Shareholders shall at all times (commencing on the date of
     this Agreement) use best efforts to keep and maintain Confidential
     Information relating to the business and assets of TEA  and Telestructures
     confidential, and Shareholders will not at any time, either directly or
     indirectly, use such Confidential Information for his own benefit, or
     divulge, disclose or communicate such Confidential Information to any
     person in any manner whatsoever, except as contemplated by this Agreement
     or required by Applicable Law or necessary to perform work as an employee
     of Buyer or an affiliated person.

               (b)  Shareholders shall at all times use best efforts to keep and
     maintain Confidential Information relating to the business and assets of
     Buyer confidential, and Shareholders will not at any time, either directly
     or indirectly, use such Confidential Information for his own benefit, or
     divulge, disclose or communicate such Confidential Information to any
     person in any manner whatsoever, except as contemplated by this Agreement
     or required by Applicable Law or as necessary to perform work as an
     employee of Buyer or an affiliated person.

               (c)  "Confidential Information" shall mean any and all
                    ------------------------
     information related to the business and the assets of the applicable person
     and the operations related thereto, including, without limitation, all
     information concerning pricing and pricing policies, marketing techniques,
     suppliers, methods and manner of operations, employee names, employee
     compensation and benefits and information relating to the identity and
     location of all past, present, and prospective clients; provided, such
     information does not include information that is or becomes publicly
     available other than as a result of acts by a party or its representative
     in violation of this Section 6.5.

               (d)  The nondisclosure requirements of this Section 6.5 shall
     apply to all of the agents, representatives and employees of the applicable
     person, and such persons shall use reasonable efforts to cause each of his
     agents, representatives and employees having access to Confidential
     Information to be timely made aware of the substance of Section 6.5.
     Further, each of the applicable persons shall use reasonable efforts to
     cause either of their agents, representatives and employees to (i) keep and
     maintain Confidential Information confidential and (ii) not use any
     Confidential Information except as permitted in this Section 6.5.

          6.6  Non-Competition Agreements.
               -------------------------- 

               (a)  The Shareholders agree that none of them or any affiliate
     will at any time within the 60 month period following the Closing (directly
     or indirectly) engage in, or have any interest in, any person (whether as
     an agent, partner, security holder, creditor, consultant or otherwise)
     other than with Buyer or an affiliated person that engages in any
     Prohibited Activity as defined in this Section 6.6(a).  The geographical
     scope of this non-competition provision shall be limited to the United
     States and those other countries in which TEA or TeleStructures engage in a

                                       18
<PAGE>
 
     Prohibited Activity within the 12 month period preceding the date of this
     Agreement and through the Closing and each subdivision thereof including
     states, provinces, counties, parishes and cities ("Sellers Restricted
                                                        ------------------
     Territories").  Notwithstanding the foregoing, Shareholders (including
     -----------                                                           
     their Affiliates) may be the owner of not more than 2% (in the aggregate)
     of the outstanding capital stock of any publicly traded corporation engaged
     in a Prohibited Activity or an unlimited amount of the stock of Buyer or
     its successor.  For purposes of this Section 6.6(a), "Prohibited Activity"
                                                           ------------------- 
     shall mean (i) any activity described in Section 6.6(d)(i) and any other
     activity that is the same as, similar to, or competitive with any activity
     engaged in by TEA or by TeleStructures in the 12 month period preceding the
     date of this Agreement and through the Closing, (ii) soliciting, consulting
     with, being employed by or acting as an agent for (directly or indirectly)
     any prior or existing client or competitor of the TEA or TeleStructures (if
     applicable) with respect to those activities specified in (i) above, and
     (iii) soliciting, inducing or enticing the employment or hire of any
     employee of TEA or TeleStructures.

               (b)  The Shareholders agree that none of them or any affiliate
     will at any time prior to and within the 60 month period following the
     Closing (directly or indirectly) engage in, or have any interest in, any
     person (whether as an agent, partner, security holder, creditor, consultant
     or otherwise other than with Buyer or an affiliated person) that engages in
     any Prohibited Activity, as defined in this Section 6.6(b). The
     geographical scope of this non-competition provision shall be limited to
     the United States, Puerto Rico, United Kingdom and those other countries in
     which Buyer, CTC, Spectrum Site Management Corporation, a Delaware
     corporation ("Spectrum"), Castle Tower Corporation (PR), a Puerto Rican
                   --------                                                 
     corporation ("CTC(PR)"), Castle Transmission International Ltd., an English
                   ------                                                       
     and Wales corporation ("CTI Ltd."), Castle Transmission Services (Holdings)
                             --------                                           
     Ltd., an English and Wales corporation ("CTS Ltd."), Castle Transmission
                                              --------                       
     (Finance) Plc, an English and Wales corporation ("CTF Plc"), or any other
                                                       -------                
     Buyer affiliate, if applicable, engage in a Prohibited Activity within the
     12 month period preceding the date of this Agreement and through the
     Closing and each subdivision thereof including states, provinces, counties,
     parishes and cities ("Buyer Restricted Territories").  Notwithstanding the
                           ----------------------------                        
     foregoing, Shareholders (including their affiliates) may be the owner of
     not more than 2% (in the aggregate) of the outstanding capital stock of any
     publicly traded corporation engaged in a Prohibited Activity or an
     unlimited amount of the stock of Buyer or its successor.  For purposes of
     this Section 6.6(b), "Prohibited Activity" shall mean (i) any activity
                           -------------------                             
     described in Section 6.6(d)(ii) or any other activity that is the same as,
     similar to, or competitive with any activity engaged in by Buyer, CTC,
     Spectrum, CTC(PR), CTI Ltd., CTS Ltd., CTF Plc, or any other affiliate of
     Buyer in the 12 month period preceding the date of this Agreement and
     through the Closing, (ii) soliciting, consulting for, being employed by or
     acting as an agent for (directly or indirectly) any prior or existing
     client or competitor of the Buyer, CTC, Spectrum, CTC(PR), CTI Ltd. or an
     other affiliate of Buyer with respect to those activities specified in (i)
     above, and (iii) soliciting, inducing or enticing the employment or hire of
     any employee of the Buyer, CTC, Spectrum, CTC(PR), CTI Ltd., CTS Ltd., CTF
     Plc, or any other affiliate of Buyer.

                                       19
<PAGE>
 
               (c)  The parties intend that the covenants contained in Sections
     6.6 (a) and (b) shall be construed as a series of separate covenants, one
     for each country described above and each legal subdivision thereof
     including states, provinces, counties, parishes and cities. Except for
     geographic coverage, each such separate covenant shall be deemed identical
     in terms to the covenants contained in Sections 6.6(a) and (b). If, in any
     judicial proceeding, a court shall refuse to enforce any of the separate
     covenants deemed included in Sections 6.6 (a) and (b), then the
     unenforceable covenant shall be deemed eliminated from such provisions for
     the purpose of those proceedings to the extent necessary to permit the
     remaining separate covenants to be enforced.

          (d)  (i)   TEA is currently in the business of providing site
     acquisition and development services (consisting of negotiation of site
     leases or purchases, obtaining necessary governmental and third party
     consents and approvals and tower site design and construction project
     management) to third party enterprises that will own or lease such sites
     for the purpose of developing one or more antennas and related structures
     to be used for telecommunication purposes.  TeleStructures is currently in
     the business of (i) designing, distributing and/or manufacturing design
     components for antenna concealment and (ii) designing and building (or
     managing the construction of) aesthetic and environmentally neutral towers
     for third parties which will allow them to build and own towers in areas
     that otherwise would restrict, oppose or prohibit the building of a tower.

               (ii)   Buyer, CTC, Spectrum, CTC(PR) or CTI Ltd. is currently in
     the business of (a) telecommunication site, tower and related structures
     and equipment acquisition, ownership, management and leasing, (b)
     installing/constructing, operating and maintaining telecommunication sites
     and site equipment for or on rooftops, antenna/tower sites and fiber, (c)
     specialized mobile radio and (d) radio microwave.

               (iii)  For the purpose of this Section 6.6, "client" means any
     person (including an affiliate of such person) to whom the applicable
     person is or has provided services at anytime during the applicable period
     prior to the date of the prohibited activity and "person" means an
     individual, corporation, partnership, limited liability company or any
     other entity.  A person shall be deemed affiliated with another person if,
     directly or indirectly, it controls, is controlled by or is under common
     control with such person. Further, a person is considered engaged in an
     activity if it contemplated engaging in such activity as evidenced by
     definitive plans, marketing and sales efforts.

               (iv)  The restrictions pursuant to this Section 6.6 are not
     applicable to Minnich and Pugh.

          (e)  The 60 month non-compete period applicable to a Shareholder in
Section 6.6(a) and (b) shall be reduced to (i) a 12 month period following
payment default on the Note payable to such Shareholder if such default is not
cured within five (5) days after 

                                       20
<PAGE>
 
written notice to Buyer, (ii) July 1, 2001 if Buyer delays its initial public
offering beyond June 30, 1999, and (iii) a 12 month period following termination
of employment of such Shareholder if the non-compete provisions contained in the
applicable Executive Employment Agreement with such Shareholder are reduced
pursuant to Section 10.3 of such agreement.

          6.7  "Piggy-Back" Registration.  If Buyer (or its successor) at any
                ------------------------                                     
time proposes to register any of Buyer Class B Stock (or shares issued in
exchange therefor or in respect thereof) under the Securities Act for sale to
the public, whether for its own account or for the account of other stockholders
or both (except with respect to registration statements on Forms S-4, S-8 or
another form not available for registering the Buyer Class B Stock issued
pursuant to the Merger (or shares issued in exchange therefor or in respect
thereof) ("Restricted Stock") for sale to the public), each such time it will
           ----------------                                                  
give written notice to B. Neurohr, Jones and Pugh of its intention so to do.
Upon the written request of B. Neurohr, Jones and Pugh, received by Buyer (or
its successor) within 20 days after the giving of any such notice by Buyer (or
its successors), to register any of the Restricted Stock, Buyer (or its
successor) will use its best efforts to cause the Restricted Stock as to which
registration shall have been so requested to be included, at Buyer's or its
successor's expense, in the Buyer Class B Stock to be covered by the
registration statement proposed to be filed by Buyer (or its successor), all to
the extent requisite to permit the sale or other disposition by B. Neurohr,
Jones and Pugh, as applicable, of such Restricted Stock so registered.  In the
event that any registration pursuant to this Section 6.7 shall be, in whole or
in part, an underwritten public offering, the number of shares of Restricted
Stock to be included in such an underwriting may be reduced if and to the extent
that the managing underwriter shall be of the opinion that such inclusion would
adversely affect the marketing of the securities to be sold by Buyer (or its
successor) therein; provided, such reduction is shared pro rata with other
shareholders requesting registration. Notwithstanding the foregoing provisions,
Buyer (or its successor) may withdraw or suspend any registration statement
referred to in this Section 6.7 without thereby incurring any liability. The
"piggy-back" registration right pursuant to this Section 6.7 (i) requires at
least 500 shares of Restricted Stock to be  registered, (ii) terminates ten
years from the date of  this Agreement and (iii) is non transferable.

          6.8  TEA Code Section 338(h)(10) Election.  Shareholders agree to make
               ------------------------------------                             
a valid Code Section 338(h)(10) election as to TEA including the execution and
delivery of IRS Form 8023-A and similar elections at the state level.  The sale
of the TEA Stock pursuant to this Agreement shall be treated for federal and
state income tax purposes as an asset sale by TEA and the liquidation of TEA to
the applicable Shareholders. The fair market value and purchase price of the TEA
assets for purposes of Code Sections 338 and 1060 are as indicated on Exhibit
                                                                      -------
6.8.
- --- 

          6.9  Merger.  Buyer and Shareholders contemplate that the Merger will
               ------                                                          
be a "reorganization" pursuant to Code Section 368(a)(2)(E) and shall report the
Merger consistent with such characterization.

          6.10 Wachovia Loan.  Buyer acknowledges that B. Neurohr has guaranteed
               -------------                                                    
the obligation of TEA to Wachovia Bank of Georgia, N.A. ("Wachovia Obligations")
                                                          --------------------  
and it agrees to indemnify and hold B. Neurohr harmless on the Wachovia
Obligations.  Further,

                                       21
<PAGE>
 
Buyer diligently will attempt to have B. Neurohr released from the guarantee on
the Wachovia Obligation by May 31, 1997.

                                  ARTICLE VII
                                  -----------

                                    CLOSING
                                    -------

          7.1  Closing.  The acts and events that occur for the purpose of
               -------                                                    
consummating  this Agreement and the related agreements referred to herein
                                                                          
("Closing") shall take place on the effective date of this Agreement ("Closing
- ---------                                                              -------
Date") at the offices of Brown, Parker & Leahy, L.L.P., 1200 Smith, Suite 3600,
- ----                                                                           
Houston, Texas 77002. This Agreement is being executed and delivered
simultaneously with the Closing.  The parties contemplate that the Closing will
actually occur via the transfer of documents by fax and Federal Express and the
wire transfer of funds.

          7.2  Deliveries at the Closing by Shareholders.  At the  Closing,
               -----------------------------------------                   
Shareholders shall deliver or cause to be delivered to Buyer:

               (a)  A duly executed original of this Agreement;

               (b)  An opinion of Rowe, Foltz & Martin, P.C., Sellers' and TEA
     Shareholders' counsel, dated the Closing Date, in substantially the form of
                                                                                
     Exhibit 7.2(b);
     -------------- 
 
               (c)  Duly executed stock certificates transferring the TEA Stock
     and TeleShare Stock to Buyer;

               (d)  A duly executed original Merger Plan and Certificate of
     Merger by TeleStructures;

               (e)  A duly executed stock certificate issuing the TeleStructures
     Stock to Buyer pursuant to the Merger;

               (f)  Cancelled stock certificates evidencing the TeleStructures
     Stock held by the Shareholders prior to the Merger;

               (g)  A duly executed Buyer Stockholders Agreement plus the
     Investment Letter;

               (h)  Employee Nondisclosure and Development Agreements in
     substantially the form of Exhibit 7.2(h);
                               -------------- 

               (i)  Executive Employment Agreements from B. Neurohr, Jones and
     Pugh in substantially the form of Exhibit 7.2(i);
                                       -------------- 

                                       22
<PAGE>
 
               (j)  A completed Form 8023-A (Corporate Qualified Stock Purchase)
     making a Code Section 338(h)(10) election for TEA and executed by all
     Shareholders;

               (k)  Written consent to this Agreement (including termination of
     the 1996 Agreement and application of the option proceeds) by TEA and
     TeleStructures;

               (l)  Resignation of all directors of TEA, TeleStructures and
     TeleShare except for B. Neurohr and Jones as to TEA and TeleStructures;

               (m)  Copies of the certified resolutions of TeleStructures'
     directors and shareholders described in Section 3.19, together with an
     executed Secretary's certificate certifying the adoption and continuing
     validity of such resolutions and that such authorizations remain in full
     force and effect; and

               (n)  Such other documents as are reasonably requested by Buyer or
     its counsel.

          7.3  Deliveries at the Closing by Buyer.  At the Closing, Buyer shall
               ----------------------------------                              
deliver or cause to be delivered to Shareholders:

               (a)  A duly executed original of this Agreement;

               (b)  The sum of $5,999,000.00 in the manner described in Section
     2.2(a);

               (c)  The Notes duly executed;

               (d)  The sum of $1,000.00 in the manner described in Section
     2.2(c);

               (e)  The sum of $250,018.00 pursuant to the Merger:

               (f)  Duly executed stock certificates transferring the Buyer
     Class B Common Stock issued to Shareholders pursuant to the Merger;

               (g)  A duly executed original Merger Plan by Castle TTT;

               (h)  An opinion of Brown, Parker & Leahy, L.L.P., Buyer's
     counsel, dated the Closing Date, in substantially the form of Exhibit
                                                                   -------
     7.3(h);
     ------ 

               (i)  Copies of the certified resolutions of Buyer's and Castle
     TTT directors and shareholder described in Section 4.2, together with an
     executed Secretary's certificate certifying the adoption and continuing
     validity of such resolutions and that such authorizations remain in full
     force and effect;

               (j)  Written consent to this Agreement (including termination of
     the 1996 Agreement and application of option proceeds) by Castle TTT; and

                                       23
<PAGE>
 
               (k)  Such other documents as reasonably requested by Sellers or
     their counsel.

          7.4  Certificate of Merger.  At the Closing, Buyer and Shareholders
               ---------------------                                         
shall cause a Certificate of Merger meeting the requirements of applicable law
to be properly executed and filed in accordance with applicable law effective on
the Closing Date.


                                  ARTICLE VIII
                                  ------------

                        INDEMNIFICATION AND SURVIVAL OF
                        -------------------------------
                         REPRESENTATIONS AND WARRANTIES
                         ------------------------------

          8.1  Survival of Representations, Warranties, Covenants and
               ------------------------------------------------------
Agreements.  The representations, warranties, covenants and agreements of
Shareholders and Buyer contained herein (including the exhibits attached hereto)
or in any document, certificate or other instrument delivered by or on behalf of
the Shareholders or Buyer pursuant to this Agreement (all such representations,
warranties, covenants and agreements of a Shareholder are referred to as
                                                                        
"Sellers' Obligations", and all such representations, warranties, covenants and
- ---------------------                                                          
agreements of Buyer are  referred to as "Buyer's Obligations") shall survive for
                                         -------------------                    
24 months after the Closing.  The above limitation period is not applicable to
the covenants pursuant to Sections 6.3, 6.5, 6.6, 6.7 and 6.10 or to any tax
obligations (including interest and penalties).  Any investigations made by or
on behalf of Buyer or Shareholders prior to the Closing Date shall not affect
Seller's Obligations or Buyer's Obligations hereunder.  Completion of the
transactions contemplated herein shall not be deemed or construed to be a waiver
of any right or remedy of Buyer or Shareholders, notwithstanding the existence
of any facts that Buyer or Shareholders knew or should have known at the time of
Closing.

          8.2  Indemnification of Buyer.  The Shareholders, jointly and
               ------------------------                                
severally, shall indemnify, defend and hold Buyer harmless with respect to any
and all claims, demands, losses, costs, expenses, obligations, liabilities,
damages, recoveries and deficiencies, including, without limitation, interest,
penalties and attorneys' fees ("Claims") that Buyer shall incur or suffer, which
                                ------                                          
arise, result from, or relate to:  (i) any breach by a Shareholders of Sellers'
Obligations.

          8.3  Claims for Indemnification.  Whenever any Claim shall arise for
               --------------------------                                     
indemnification of Buyer under this Article VIII, Buyer shall notify the
Shareholders of the Claim and, when known, the facts constituting the basis for
such Claim.  Buyer shall give the Shareholders a reasonable opportunity to
defend any such Claim at their own expense and with counsel of their own
selection; provided, that Buyer shall at all times also have the right to fully
participate in the defense at its own expense.  If the Shareholders shall,
within a reasonable time after notice, fail to defend, Buyer shall have the
right to undertake the defense of, and to compromise or settle (exercising
reasonable business judgment) the Claim on behalf, for the account, and at the
risk, of the Shareholders.  Buyer shall notify the Shareholders in writing of
the existence of any Claim to which indemnification by the Shareholders would
apply, but failure to so notify the Shareholders shall not relieve the

                                       24
<PAGE>
 
Shareholders of any liability hereunder unless, and to the extent, such failure
materially and adversely effects Shareholders' rights to defend such Claim.

          8.4  Manner of Indemnification of Buyer.  A Claim resulting in any
               ----------------------------------                           
loss, obligation, costs, expenses, liability or damages of any nature
indemnified by the Shareholders under this Article VII shall be effected by
delivery of a cashier's or certified check to Buyer not later than 14 days from
the date of resolution of such Claim.  Buyer shall have the right to offset any
and all amounts owing from Buyer to the Shareholders (whether arising hereunder,
under any other document executed in connection herewith or otherwise) against
any and all amounts owed to Buyer by the Shareholders (whether arising
hereunder, under any other document executed in connection herewith or
otherwise).

          8.5  Indemnification of the Shareholders.  Buyer shall indemnify,
               -----------------------------------                         
defend and hold harmless any of the Shareholders against and in respect of any
and all Claims that any of the Shareholders shall incur or suffer that arise,
result from or relate to any breach of Buyer's Obligations.

          8.6  Claims for Indemnification.  Whenever any Claim shall arise for
               --------------------------                                     
indemnification of the Shareholders under this Article VII, the  Shareholders
shall notify Buyer of the Claim and, when known, the facts constituting the
basis for such Claim.  The Shareholders shall give Buyer a reasonable
opportunity to defend any such Claim at its own expense and with counsel of its
own selection; provided, that the Shareholders shall at all times also have the
right to fully participate in the defense at their own expense.  If Buyer shall,
within a reasonable time after notice, fail to defend, the Shareholders shall
have the right to undertake the defense of, and to compromise or settle
(exercising reasonable business judgment) the Claim on behalf, for the account,
and at the risk, of Buyer.  The Shareholders shall notify Buyer in writing of
the existence of any Claim to which Buyer's indemnification would apply, but
failure to so notify Buyer shall not relieve Buyer of any liability hereunder
unless, and to the extent, such failure causes Buyer to lose the right to assert
a reasonable defense to such Claim.

          8.7  Manner of Indemnification of  the Shareholders.   A Claim
               ----------------------------------------------           
resulting in any loss, obligation, costs, expenses, liability or damages of any
nature indemnified by the Buyer under this Article VIII shall be effected by the
delivery of a cashier's or certified check not later than 14 days from the date
of resolution of such Claim.

          8.8  Limitations.  Notwithstanding anything to the contrary contained
               -----------                                                     
in this Article VIII, Shareholders shall have no obligation to indemnify Buyer
and Buyer shall have no obligation to indemnify Shareholders until the aggregate
loss to Buyer or Shareholders, as applicable, for all Claims exceeds $40,000;
provided, once the sum of $40,000 in aggregate loss for all Claims is exceeded,
the total amount of the aggregate Claims shall be collected by Buyer or
Shareholders, as applicable, without regard to such $40,000 amount.  Further,
notwithstanding anything to the contrary contained in this Article VIII, the
aggregate liability of Shareholders or Buyer to indemnify Buyer or Shareholders,
as applicable, pursuant to this Article VIII, shall be limited to
$12,372,000.00.

                                       25
<PAGE>
 
          8.9  Minnich, F. Neurohr and Pugh Limitations.  Notwithstanding
               ----------------------------------------                  
anything to the contrary contained in this Article VIII, the obligation of
Minnich and F. Neurohr pursuant to this Article VIII is limited to Claims
relating to TEA and the obligation of Pugh pursuant to this Article VIII is
limited to Claims relating to TeleStructures.

          8.10 Subrogation.  To the extent that an indemnifying person is or
               -----------                                                  
becomes liable for a claim under this Article VIII, such person shall be
subrogated to all of the rights of the indemnified person and shall have the
right of substitution in the place of the indemnified person with respect to
possible claims against third persons.

                                   ARTICLE IX
                                   ----------

                                 MISCELLANEOUS
                                 -------------

          9.1  Notices.  All notices, requests, demands and other communications
               -------                                                          
hereunder shall be in writing and shall be deemed given if delivered personally,
sent by telefacsimile or similar device, or mailed by certified or registered
mail, postage prepaid, return receipt requested, addressed as follows:

   If to Buyer:             Castle Tower Holding Corp.
                            510 Bering Drive, Suite 310
                            Houston, Texas 77057
                            Fax:(713) 974-1926
                            Attn:  Ted B. Miller, Jr.

   With a copy to:          Brown, Parker & Leahy, L.L.P.
                            1200 Smith Street, Suite 3600
                            Houston, Texas 77002
                            Fax: (713) 654-1871
                            Attn:  E. Blake Hawk

   If to Shareholders:      TEA Group Incorporated
                            1040 Crown Pointe Parkway, Suite 800
                            Atlanta, Georgia 30338
                            Fax: (770) 481-2150
                            Attn:  Bruce W. Neurohr, Charles Jones,
                            Ronald Minnich, Ferdinand Neurohr and Terry Pugh

                                       26
<PAGE>
 
   With a copy to:          Rowe, Foltz & Martin, P.C.
                            Five Piedmont Center, Suite 750
                            Atlanta, Georgia 30305
                            Fax: (404) 237-1659
                            Attn:  Paul R. Shlanta

Notice deposited in the mail in the manner described above shall be effective
three (3) days after such deposit.  Each party may change from time to time its
address to another address in the United States of America by giving five (5)
days written notice to the other parties.

          9.2  Governing Law.  This Agreement shall be governed by, and
               -------------                                           
construed and enforced in accordance with, the internal laws, and not the laws
pertaining to choice or conflicts of laws, of the State of Texas.

          9.3  Publicity.  The parties agree that press releases and other
               ---------                                                  
announcements to be made by a Shareholder with respect to the transactions
contemplated herein shall be subject to approval by Buyer.

          9.4  Entire Agreement; Modification; Waiver.  This Agreement and the
               --------------------------------------                         
agreements referenced herein constitute the entire agreement among the parties
pertaining to the subject matter contained herein, and supersede all prior and
contemporaneous agreements, representations and undertakings of the parties
including the 1996 Agreement.  No supplement, modification or amendment of this
Agreement shall be binding unless executed in writing by all parties.  No waiver
of any of the provisions of this Agreement shall be deemed, or shall constitute,
a waiver of any other provision, whether or not similar, nor shall any waiver
constitute a continuing waiver.  No waiver shall be binding unless executed in
writing by the party making the waiver.

          9.5  Severability.  Any provision of this Agreement that is invalid,
               ------------                                                   
illegal or unenforceable in any jurisdiction shall, as to that jurisdiction, be
ineffective to the extent of such invalidity, illegality or unenforceability,
without affecting in any way the remaining provisions hereof in such
jurisdiction or rendering that or any other provision of this Agreement invalid,
illegal or unenforceable in any other jurisdiction.

          9.6  Payment of Expenses.  Each of the parties shall pay all costs and
               -------------------                                              
expenses incurred or to be incurred by it in negotiating and preparing this
Agreement, and in closing and carrying out the transactions contemplated hereby.

          9.7  Assignment and Binding Effect.  Except as otherwise herein
               -----------------------------                             
provided, this Agreement shall be binding upon and inure to the benefit of the
parties hereto, their heirs, legal representatives, successors (including
successors by merger or consolidation) and assigns.

          9.8  Counterparts.  This Agreement may be executed in one or more
               ------------                                                
counterparts, each of which shall be deemed an original, but all of which shall
constitute but one and the same instrument.

                                       27
<PAGE>
 
          9.9  Headings.  Article, section and exhibit headings contained in
               --------                                                     
this Agreement (including attached exhibits) are for convenience only and shall
in no way enlarge or limit the scope or meaning of the various articles,
sections or exhibits.

          9.10 Business Days.  In the event that any date or any period provided
               -------------                                                    
for in this Agreement shall end on a Saturday, Sunday or legal holiday, the
applicable period shall be extended to the first business day following each
Saturday, Sunday or legal holiday.

          9.11 Arbitration.   If there is a disagreement between a Shareholder
               -----------                                                    
and Buyer as to any matter covered by this Agreement and the parties are unable
to resolve such disagreement, either party may elect to resolve the matter by
binding arbitration by giving written notice to the other party ("Arbitration
                                                                  -----------
Notice") that the issue shall be determined by binding arbitration pursuant to
- ------                                                                        
the Rules and Procedures of the American Arbitration Association ("AAA") which
                                                                   ---        
rules and procedures are hereby incorporated by reference for this purpose;
provided, that the selection of the arbitrator shall be made as follows: within
10 business days from the actual receipt of a list of arbitrators provided by
AAA, the Shareholder and Buyer, as applicable, shall each select an arbitrator
from such list and the lists used by each party shall be identical and the
arbitrators named shall select one other arbitrator within 15 business days
after their selection. The Arbitration Notice shall be sent to the AAA office in
Tampa, Florida.  If the arbitrators are unable to agree on a third arbitrator,
the selection shall be made by a judge of the state circuit courts of
Hillsborough County, Florida.  If any party fails to act within the time set
out, the arbitrators designated shall proceed with the arbitration. The
arbitration proceedings shall take place in Tampa, Florida, within 60 days
following the selection of the last arbitrator (unless the arbitrators extend
such date) and the arbitrators shall deliver a decision within 30 days of the
hearing.  Each party shall pay the fees and expenses of the arbitrator appointed
by it and a pro rata share of the fees and expenses of the arbitrator appointed
by their respective appointees. Further, each party shall pay its own fees and
expenses and a pro rata share of the forum charges imposed by AAA. The
arbitrators shall have authority to include the fees and expenses described in
this Section 9.11 as part of their award provided that the fees and expenses are
allocated as contemplated by this Section 9.11.  A decision resulting from the
arbitration shall be final and not appealable and any party shall have the right
to obtain an order from a court of competent jurisdiction for enforcement of
such decision. If any provision of this Section 9.11 conflicts with the Rules
and Procedures of AAA, the provision in this Section 9.11 shall control.

          9.12 Exhibits.  The failure of any Shareholder to include information
               -------- 
on any Exhibit hereto shall not be deemed a breach of the representation or
warranty related to such Exhibit if the information required to be disclosed on
such Exhibit is clearly disclosed and apparent on another Exhibit to this
Agreement.

          9.13 1996 Agreement.  The 1996 Agreement is terminated.
               --------------                                    

                                       28
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have executed this Stock
Purchase Agreement effective as of the day and year first above written, in
multiple originals.


                              CASTLE TOWER HOLDING CORP.


                              By:  /s/ John L. Gwyn
                                  ----------------------------------------
                                     John L. Gwyn, Sr. V.P. (Operations)


                               /s/ Bruce W. Neurohr
                              --------------------------------------------
                              BRUCE W. NEUROHR

                               /s/ Charles H. Jones
                              --------------------------------------------
                              CHARLES H. JONES

                               /s/ Ronald J. Minnich
                              --------------------------------------------
                              RONALD J. MINNICH

                               /s/ Ferdinand G. Neurohr
                              --------------------------------------------
                              FERDINAND G. NEUROHR

                               /s/ Terrel W. Pugh
                              --------------------------------------------
                              TERREL W. PUGH

                                       29
<PAGE>
 
The undersigned corporations consent to the terms of this Stock Purchase
Agreement including termination of the Partnership and Stock Purchase Agreement
dated July 31, 1996, by and between Castle Tower TTT Corporation, TEA Group
Incorporated, TeleStructures, Inc., Bruce W. Neurohr, Charles H. Jones, Ronald
J. Minnich and Ferdinand G. Neurohr and the application of the option proceeds
pursuant to this Stock Purchase Agreement.


                              CASTLE TOWER TTT CORPORATION

                              By:  /s/ John L. Gwyn
                                 ----------------------------------------
                                    John L. Gwyn,
                                    Senior Vice President (Operations)


                              TEA GROUP INCORPORATED

                              By:  /s/ Bruce W. Neurohr
                                 ----------------------------------------
                                    Bruce W. Neurohr, President


                              TELESTRUCTURES, INC.

                              By:  /s/ Charles H. Jones
                                 ----------------------------------------
                                    Charles H. Jones, President

                                       30

<PAGE>
 
                                                                     Exhibit 3.1

                          CERTIFICATE OF INCORPORATION
                                       OF
                           CASTLE TOWER HOLDING CORP.


     FIRST. The name of the Corporation is Castle Tower Holding Corp.

     SECOND. The address of the Corporation's registered office is 1013 Centre
Road, Wilmington, Delaware 19805. The name of its registered agent at such
address is Sonya L. Reed.

     THIRD. The purpose of the Corporation is to engage in any lawful act or
activity for which corporations may be organized under the General Corporation
Law of Delaware.

     FOURTH: The Corporation shall be authorized to issue 7,270,000 shares of
capital stock, which shall be divided into 270,000 shares of Class A Common
Stock, with a par value of one cent ($.01) per share (the "Class A Stock"),
5,000,000 shares of Class B Common Stock, with a par value of one cent ($.01)
per share (the "Class B Stock"), and 2,000,000 shares of Preferred Stock, with a
par value of one cent ($.01) per share (the "Preferred Stock").

     The following is a statement of the designations, preferences, voting
powers, qualifications, special or relative rights and privileges in respect of
the authorized capital stock of the Corporation.

1.   CLASS A COMMON STOCK AND CLASS B COMMON STOCK
     ---------------------------------------------

     1.   Except as specifically set forth herein, the rights of the holders of
Class A Stock and Class B Stock shall be identical, and the Class A Stock and
Class B Stock shall be treated as a single class of Common Stock and shall be
referred to herein collectively as the "Common Stock." The voting, dividend and
liquidation rights of the holders of the Class A Stock and Class B Stock are
subject to and qualified by the rights of the holders of the Preferred Stock.

     2.   Voting.   The holders of the Class B Stock are entitled to one vote
          ------                                                             
for each share held at all meetings of stockholders (and written actions in lieu
of meetings). The holders of Class A Stock are entitled to such number of votes
per share of Class A Stock as shall equal the number of shares of Class B Stock
(including fractions of a share) into which each share of Class A Stock is then
convertible. There shall be no cumulative voting.

     3.   Dividends.  Dividends may be declared and paid on the Class A Stock
          ---------                                                          
and Class B Stock from funds lawfully available therefor as and when determined
by the Board of Directors and subject to any preferential dividend rights of any
then outstanding Preferred Stock. Any dividend declared by the Board of
Directors shall be declared and paid upon the outstanding shares of Class A
Stock and Class B Stock in equal amounts per share (treating each share of Class
A Stock as being equal to the number of shares of Class B Stock (including
fractions of a share) into which each share of Class A Stock is then
convertible) and without preference or priority of either the Class A Stock or
the Class B Stock over the other, provided that dividends payable in stock of
the Corporation may be declared and paid on the Class A Stock in shares of Class
A Stock and on the Class B Stock in shares of Class B Stock.
<PAGE>
 
     4.   Liquidation, Dissolution or Winding Up. In the event of any voluntary
          ---------------------------------------                               
or involuntary liquidation, dissolution or winding up on the Corporation, after
payment of all preferential amounts required to be paid to the holders of
Preferred Stock, the holders of shares of Class A Stock and Class B Stock then
outstanding shall share ratably in any distribution of the remaining assets and
funds of the Corporation in proportion to the respective amounts which would
otherwise be payable in respect of the shares held by them upon such
distribution if all amounts payable on or with respect to such shares were paid
in full. For this purpose, each share of Class A Stock shall be entitled to
receive the amount which would be payable shares of Class B Stock issued on
conversion of such Class A Stock if such conversion had occurred immediately
prior to such distribution.

5.   Conversion of Class A Stock.
     --------------------------- 

     5A.  Optional Conversion. Each share of Class A Stock shall be convertible,
          -------------------                                                   
at the option of the holder, at any time and from time to time, into one share
of fully paid and nonassessable shares of Class B Stock; provided that upon the
                                                         --------              
closing of the initial issuance of shares of Series A Convertible Preferred
Stock by the Company such conversion rate shall be automatically adjusted
without any further action required so that each share of Class A Stock shall be
convertible into such number of fully paid and nonassessable shares of Class B
Stock as is determined by dividing 270,000 into 411,250.

     5B.  Mandatory Conversion. The Corporation may, at its option, require all
          --------------------                                                 
(and not less than all) holders of shares of Class A Stock then outstanding to
convert their shares of Class A Stock into shares of Class B Stock, at the then
effective conversion rate pursuant to Section 5A, simultaneously with the
conversion of outstanding shares of Series A Convertible Preferred Stock
pursuant to Section II.5.0. of this Article Fourth. All holders of record of
shares of Class A Stock will be given at least 10 days' prior written notice of
the date fixed and the place designated for mandatory conversion of all such
shares of Class A Stock. Such notice will be sent by first class or registered
mail, postage prepaid, to each record holder of Class A Stock at such holder's
address last shown on the records of the transfer agent for the Class A Stock
(or the records of the Corporation, if it serves as its own transfer agent). On
or before the date fixed for conversion, each holder of shares of Class A Stock
shall surrender his or its certificate or certificates for all such shares to
the Corporation at the place designated in such notice, and shall thereafter
receive certificates for the number of shares of Class B Stock to which such
holder is entitled. On the date fixed for conversion, all rights with respect to
the Class A Stock so converted, including the rights, if any, to receive notices
and vote, will terminate, except only the rights of the holders thereof, upon
surrender of their certificate or certificates thereof, to receive certificates
for the number of shares of Class B Stock into which such Class A Stock has been
converted. If so required by the Corporation, certificates surrendered for
conversion shall be endorsed or accompanied by written instrument or instruments
of transfer, in form reasonably satisfactory to the Corporation, duly executed
by the registered holder or by his or its attorney duly authorized in writing.
As promptly as practicable after the date of such mandatory conversion and the
surrender of the certificate or certificates for Class A Stock, the Corporation
shall cause to be issued and delivered to such holder, or on his or its written
order, a certificate or certificates for the number of full shares of Class B
Stock issuable on such conversion in accordance with the provisions hereof. All
certificates evidencing shares of Class A Stock which are required to be
surrendered for conversion in accordance with the provisions hereof shall, from
and after the date such certificates are so required to be surrendered, be
deemed to have been retired and canceled 

                                       2
<PAGE>
 
and the shares of Class A Stock represented thereby converted into Class B Stock
for all purposes, notwithstanding the failure of the holder or holders thereof
to surrender such certificates on or prior to such date. The Corporation may
thereafter take such appropriate action as may be necessary to reduce the
authorized Class A Stock accordingly.

     5C.  Fractional Shares: Partial Conversion. No fractional shares shall be
          -------------------------------------                               
issued upon conversion of Class A Stock into Class B Stock.  In case the number
of shares of Class A Stock represented by the certificate or certificates
surrendered pursuant to subparagraph 5A exceeds the number of shares converted,
the Corporation shall, upon such conversion, execute and deliver to the holder,
at the expense of the Corporation, a new certificate or certificates for the
number of shares of Class A Stock represented by the certificate or certificates
surrendered which are not to be converted. If any fractional share of Class B
Stock would, except for the provisions of the first sentence of this
subparagraph "5c", be delivered upon such conversion, the Corporation, in lieu
of delivering such fractional share, shall pay to the holder surrendering the
Class A Stock for conversion an amount in cash equal to the current market price
of such fractional share as determined in good faith by the Board of Directors
of the Corporation without minority, marketability or similar discounts. In the
event of a liquidation of the Corporation, the aforesaid conversion rights shall
terminate at the close of business on the first full day preceding the date
fixed for the payment of any amounts distributable on liquidation to the holders
of Class A Stock. In order for a holder of Class A Stock to convert shares of
Class A Stock into shares of Class B Stock, such holder shall surrender the
certificate or certificates for such shares of Class A Stock, at the office of
the transfer agent for the Class A Stock (or at the principal office of the
Corporation if the Corporation serves as its own transfer agent), together with
written notice that such holder elects to convert all or any number of the
shares of Class A Stock represented by such certificate or certificates. Such
notice shall state such holder's name or the names of the nominees in which such
holder wishes the certificate or certificates for shares of Class B Stock to be
issued. If required by the Corporation, certificates surrendered for conversion
shall be endorsed or accompanied by a written instrument or instruments of
transfer, in form satisfactory to the Corporation, duly executed by the
registered holder or his or its attorney duly authorized in writing. The date of
receipt of such certificates and notice by the transfer agent (or by the
Corporation if the Corporation serves as its own transfer agent) shall be the
conversion date ("Class A Stock Conversion Date"). The Corporation shall, as
soon as practicable after the Class A Conversion Date, issue and deliver at such
office to such holder of Class A Stock, or to his or its nominees, a certificate
or certificates for the number of shares of Class B Stock to which such holder
shall be entitled. The Corporation shall at all times when the Class A Stock
shall be outstanding, reserve and keep available out of its authorized but
unissued stock, for the purpose of effecting the conversion of the Class A
Stock, such number of its duly authorized shares of Class B Stock as shall from
time to time be sufficient to effect the conversion of all outstanding Class A
Stock. All shares of Class A Stock which shall have been surrendered for
conversion as herein provided shall no longer be deemed to be outstanding and
all rights with respect to such shares, including the rights, if any, to receive
notices and to vote, shall immediately cease and terminate on the Class A Stock
Conversion Date, except only the right of the holders thereof to receive shares
of Class B Stock in exchange therefor. Any shares of Class A Stock so converted
shall be retired and canceled and shall not be reissued, and the Corporation may
from time to time take such appropriate action as may be necessary to reduce the
authorized Class A Stock accordingly.

                                       3
<PAGE>
 
     5D.  Subdivision or Combination of Class B Stock.  In case the Corporation
          -------------------------------------------                          
shall at any time subdivide (by any stock split, stock dividend or otherwise)
its outstanding shares of Class B Stock into a greater number of shares, the
conversion ratio in effect immediately prior to such subdivision shall be
proportionately reduced, and, conversely, in case the outstanding shares of
Class B Stock shall be combined into a smaller number of shares, the conversion
ratio in effect immediately prior to such combination shall be proportionately
increased.

     5E.  Reorganization or Reclassification.  If any capital reorganization or
          ----------------------------------                                   
reclassification of the capital stock of the Corporation shall be effected in
such a way that holders of Class B Stock shall be entitled to receive stock,
securities or assets with respect to or in exchange for Class B Stock, then, as
a condition of such reorganization or reclassification, lawful and adequate
provisions shall be made whereby each holder of a share or shares of Class A
Stock shall thereupon have the right to receive, upon the basis and upon the
terms and conditions specified herein and in lieu of the shares of Class B Stock
immediately theretofore receivable upon the conversion of such share or shares
of Class A Stock, such shares of stock, securities or assets as may be issued or
payable with respect to or in exchange for a number of outstanding shares of
such Class B Stock equal to the number of shares of such Class B Stock
immediately theretofore receivable upon such conversion had such reorganization
or reclassification not taken place, and in any such case appropriate provisions
shall be made with respect to the rights and interests of such holder to the end
that the provisions hereof (including without limitation provisions for
adjustments of the Conversion Price) shall thereafter be applicable, as nearly
as may be, in relation to any shares of stock, securities or assets thereafter
deliverable upon the exercise of such conversion rights.

     5F.  Notice of Adjustment. Upon any adjustment of the conversion ratio,
          --------------------                                              
then and in each such case the Corporation shall give written notice thereof, by
delivery in person, certified or registered mail, return receipt requested,
telecopier or telex, addressed to each holder of shares of Class A Stock at the
address of such holder as shown on the books of the Corporation, which notice
shall state the conversion ratio resulting from such adjustment, setting forth
in reasonable detail the method upon which such calculation is based.

     5G.  Other Notices.  In case at any time:
          -------------                       

     (1)  the Corporation shall declare any dividend upon its Class B Stock
payable in cash or stock or make any other distribution to the holders of its
Class B Stock;

     (2)  the Corporation shall offer for subscription pro rata to the holders
of its Class B Stock any additional shares of stock of any class or other
rights;

     (3)  there shall be any capital reorganization or reclassification of the
capital stock of the Corporation, or a consolidation or merger of the
Corporation with or into another entity or entities, or a sale, lease,
abandonment, transfer or other disposition of all or substantially all its
assets; or

     (4) there shall be a voluntary or involuntary dissolution, liquidation or
winding up of the Corporation; then, in any one or more of said cases, the
Corporation shall give, by delivery in person, certified or registered mail,
return receipt requested, telecopier or telex, addressed to each holder of any
shares of Class A Stock at the address of such holder as shown on the books

                                       4
<PAGE>
 
of the Corporation, (a) at least 20 days' prior written notice of the date on
which the books of the Corporation shall close or a record shall be taken for
such dividend, distribution or subscription rights or for determining rights to
vote in respect of any such reorganization, reclassification, consolidation,
merger, disposition, dissolution, liquidation or winding up and (b) in the case
of any such reorganization, reclassification, consolidation, merger,
disposition, dissolution, liquidation or winding up, at least 20 days' prior
written notice of the date when the same shall take place. Such notice in
accordance with the foregoing clause (a) shall also specify, in the case of any
such dividend, distribution or subscription rights, the date on which the
holders of Class B Stock shall be entitled thereto and such notice in accordance
with the foregoing clause (b) shall also specify the date on which the holders
of Class B Stock shall be entitled to exchange their Class B Stock for
securities or other property deliverable upon such reorganization,
reclassification, consolidation, merger, disposition, dissolution, liquidation
or winding up, as the case may be.

     5H.  Stock to be Reserved.  The Corporation will at all times reserve and
          --------------------                                                
keep available out of its authorized Class B Stock, solely for the purpose of
issuance upon the conversion of Class A Stock as herein provided, such number of
shares of Class B Stock as shall then be issuable upon the conversion of all
outstanding shares of Class A Stock. The Corporation covenants that all shares
of Class B Stock which shall be so issued shall be duly and validly issued and
fully paid and nonassessable and free from all taxes, liens and charges with
respect to the issue thereof. The Corporation will take all such action as may
be necessary to assure that all such shares of Class B Stock may be so issued
without violation of any applicable law or regulation, or of any requirement of
any national securities exchange upon which the Class B Stock may be listed. The
Corporation will not take any action which results in any adjustment of the
conversion ratio if the total number of shares of Class B Stock issued and
issuable after such action upon conversion of the Class A Stock would exceed the
total number of shares of Class B Stock then authorized by the Certificate of
Incorporation.

     5I.  No Reissuance of Class A Stock. Shares of Class A Stock which are
          ------------------------------                                   
converted into shares of Class B Stock as provided herein shall not be reissued.

II.  SERIES A CONVERTIBLE PREFERRED STOCK
     ------------------------------------

     1.   Number of Shares. The series of Preferred Stock designated and known
          ----------------                                                    
as "Series A Convertible Preferred Stock" shall consist of 2,000,000 shares.

     2.   Voting.
          ------ 

     2A.  General. Except as may be otherwise provided in these terms of the
          -------                                                           
Series A Convertible Preferred Stock or by law, the Series A Convertible
Preferred Stock shall vote together with all other classes and series of stock
of the Corporation as a single class on all actions to be taken by the
stockholders of the Corporation. Each share of Series A Convertible Preferred
Stock shall entitle the holder thereof to such number of votes per share on each
such action as shall equal the number of shares of Class B Common Stock, par
value $.01 per share (the "Class B Stock") (including fractions of a share) into
which each share of Series A Convertible Preferred Stock is then convertible.

     2B.  Board Size. The Corporation shall not, without the written consent or
          ----------                                                           
affirmative vote of the holders of at least two-thirds of the then outstanding
shares of Series A Convertible 

                                       5
<PAGE>
 
Preferred Stock, given in writing or by vote at a meeting, consenting or voting
(as the case may be) separately as a series, increase the maximum number of
directors constituting the Board of Directors to a number in excess of seven
(7).

     2C.  Board Seats. The holders of the Series A Convertible Preferred Stock,
          -----------                                                          
voting as a separate series, shall be entitled to elect two (2) directors of the
Corporation. The holders of the Class A Common Stock, par value $.01 per share
(the "Class A Stock"), voting as a separate class, shall be entitled to elect
two (2) directors of the Corporation. The holders of the Series A Convertible
Preferred Stock and both classes of Common Stock, voting together as a single
class, shall be entitled to elect three (3) directors of the Corporation (with
each share of Series A Convertible Preferred Stock entitled to that number of
votes per share on each such action as shall equal the number of shares of 
Class B Stock (including fractions of a share) into which each share of Series A
Convertible Preferred Stock is then convertible.) At any meeting (or in a
written consent in lieu thereof) held for the purpose of electing directors, the
presence in person or by proxy (or the written consent) of the holders of a
majority of the shares of Series A Convertible Preferred Stock then outstanding
shall constitute a quorum of the Series A Convertible Preferred Stock for the
election of directors to be elected solely by the holders of the Series A
Convertible Preferred Stock or jointly by the holders of the Series A
Convertible Preferred Stock and the Common Stock. A vacancy in any directorship
elected by the holders of the Series A Convertible Preferred Stock shall be
filled only by vote or written consent of the holders of the Series A
Convertible Preferred Stock, a vacancy in any directorship elected by the
holders of the Class A Stock shall be filled only by vote or written consent of
the holders of the Class A Stock and a vacancy in the directorship elected
jointly by the holders of the Series A Convertible Preferred Stock and the
Common Stock shall be filled only by vote or written consent of the holders of
Series A Convertible Preferred Stock and the Common Stock as provided above.

     3.   Dividends. The holders of the Series A Convertible Preferred Stock
          ---------                                                         
shall be entitled to receive, out of funds legally available therefor, and the
Company shall declare and pay dividends on the Series A Convertible Preferred
Stock at the same rate as dividends (other than dividends payable in additional
shares of Common Stock) are declared and paid with respect to the Common Stock
(treating each share of Series A Convertible Preferred Stock as being equal to
the number of shares of Common Stock (including fractions of a share) into which
each share of Series A Convertible Preferred Stock is then convertible).

     4.   Liquidation. Upon any liquidation, dissolution or winding up of the
          -----------                                                        
Corporation, whether voluntary or involuntary, the holders of the shares of
Series A Convertible Preferred Stock shall be entitled, before any distribution
or payment is made upon any stock ranking on liquidation junior to the Series A
Convertible Preferred Stock, to be paid an amount equal to the greater of 
(i) $6.00 per share plus, in the case of each share, an amount equal to all
dividends declared but unpaid thereon, computed to the date payment thereof is
made available, or (ii) such amount per share as would have been payable had
each such share been converted to Common Stock pursuant to paragraph 6
immediately prior to such liquidation, dissolution or winding up, and the
holders of Series A Convertible Preferred Stock shall not be entitled to any
further payment, such amount payable with respect to one share of Series A
Convertible Preferred Stock being sometimes referred to as the "Liquidation
Payment" and with respect to all shares of Series A Convertible Preferred Stock
being sometimes referred to as the "Liquidation Payments". If upon such
liquidation, dissolution or winding up of the Corporation, whether voluntary or
involuntary, the assets to be distributed among the holders of Series A
Convertible Preferred
 
                                       6
<PAGE>
 
Stock shall be insufficient to permit payment to the holders of Series A
Convertible Preferred Stock of the amount distributable as aforesaid, then the
entire assets of the Corporation to be so distributed shall be distributed
ratably among the holders of Series A Convertible Preferred Stock. Upon any such
liquidation, dissolution or winding up of the Corporation, after the holders of
Series A Convertible Preferred Stock shall have been paid in full the amounts to
which they shall be entitled, the remaining net assets of the Corporation may be
distributed to the holders of stock ranking on liquidation junior to the Series
A Convertible Preferred Stock. Written notice of such liquidation, dissolution
or winding up, stating a payment date, the amount of the Liquidation Payments
and the place where saidLiquidation Payments shall be payable, shall be
delivered in person, mailed by certified or registered mail, return receipt
requested, or sent by telecopier or telex, not less than 20 days prior to the
payment date stated therein, to the holders of record of Series A Convertible
Preferred Stock, such notice to be addressed to each such holder at its address
as shown by the records of the Corporation. The consolidation or merger of the
Corporation into or with any other entity or entities which results in the
exchange of outstanding shares of the Corporation for securities or other
consideration issued or paid or caused to be issued or paid by any such entity
or affiliate thereof (other than a merger to reincorporate the Corporation in a
different jurisdiction), an d the sale, lease, abandonment, transfer or other
disposition by the Corporation of all or substantially all its assets, shall be
deemed to be a liquidation, dissolution or winding of the Corporation within the
meaning of the provisions of this paragraph 4. For purposes hereof, the Common
Stock shall rank on liquidation junior to the Series A Convertible Preferred
Stock.

     5.   Conversion. The holders of shares of Series A Convertible Preferred
          ----------
shall have the following conversion rights: 

     5A.  Optional Conversion. Subject to the terms and conditions of this 5, 
          -------------------
the holder of any share or shares of Series A Convertible Preferred Stock shall
have the right, at its option at any time, to convert any such shares of Series
A Convertible Preferred Stock (except that upon any liquidation of the
Corporation the right of conversion shall terminate at the close of business on
the business day fixed for payment of the amount distributable on the Series A
Convertible Preferred Stock) into such number of fully paid and nonassessable
shares of Class B Stock as is obtained by (i) multiplying the number of shares
of Series A Convertible Preferred Stock so to be converted by $6.00 and (ii)
dividing the result by the conversion price of $6.00 per share or, in case an
adjustment of such price has taken place pursuant to the further provisions of
this paragraph 5, then by the conversion price as last adjusted and in effect at
the date any share or shares of Series A Convertible Preferred Stock are
surrendered for conversion (such price, or such price as last adjusted, being
referred to as the "Conversion Price"). Such rights of conversion shall be
exercised by the holder thereof by giving written notice that the holder elects
to convert a stated number of shares of Series A Convertible Preferred Stock
into Class B Stock and by surrender of a certificate or certificates for the
shares so to be converted to the Corporation at its principal office (or such
other office or agency of the Corporation as the Corporation may designate by
notice in writing to the holders of the Series A Convertible Preferred Stock) at
any time during its usual business hours on the date set forth in such notice,
together with a statement of the name or names (with address) in which the
certificate or certificates for shares of Class B Stock shall be issued.

     5B   Issuance of Certificates: Time Conversion Effected. Promptly after the
          --------------------------------------------------
receipt of the written notice referred to in subparagraph 5A and surrender of
the certificate or certificates
                                       
                                       7
<PAGE>
 
for the share or shares of Series A Convertible Preferred Stock to be converted,
the Corporation shall issue and deliver, or cause to be issued and delivered, to
the holder, registered in such name or names as such holder may direct, a
certificate or certificates for the number of whole shares of Class B Stock
issuable upon the conversion of such share or shares of Series A Convertible
Preferred Stock. To the extent permitted by law, such conversion shall be deemed
to have been effected and the Conversion Price shall be determined as of the
close of business on the date on the date on which such written notice shall
have been received by the Corporation and the certificate or certificates for
such share or shares shall have been surrendered as aforesaid, and at such time
the rights of the holder of such share or shares of Series A Convertible
Preferred Stock shall cease, and the person or persons in whose name or names
any certificate or certificates for shares of Class B Stock shall be issuable
upon such conversion shall be deemed to have become the holder or holders of
record of the shares represented thereby.

     5C.  Fractional Shares: Dividends: Partial Conversion. No fractional shares
          ------------------------------------------------                      
shall be issued upon conversion of Series A Convertible Preferred Stock into
Class B Stock and no payment or adjustment shall be made upon any conversion on
account of any cash dividends on the Class B Stock issued upon such conversion.
At the time of each conversion, the Corporation shall pay in cash an amount
equal to all dividends, declared but unpaid on the shares of Series A
Convertible Preferred Stock surrendered for conversion to the date upon which
such conversion is deemed to take place as provided in subparagraph 5B. In case
the number of shares of Series A Convertible Preferred Stock represented by the
certificate or certificates surrendered pursuant to subparagraph 5A exceeds the
number of shares converted, the Corporation shall, upon such conversion, execute
and deliver to the holder, at the expense of the Corporation, a new certificate
or certificates for the number of shares of Series A Convertible Preferred Stock
represented by the certificate or certificates surrendered which are not to be
converted. If any fractional share of Class B Stock would, except for the
provisions of the first sentence of this subparagraph 5C, be delivered upon such
conversion, the Corporation, in lieu of delivering such fractional share, shall
pay to the holder surrendering the Series A Convertible Preferred Stock for
conversion an amount in cash equal to the current market price of such
fractional share as determined in good faith by the Board of Directors of the
Corporation.

     5D.  Adjustment of Price Upon Issuance of Common Stock. Except as provided
          -------------------------------------------------                    
in subparagraph 5E, if and whenever the Corporation shall issue or sell, or is,
in accordance with subparagraphs 5D(1) through 5D(7), deemed to have issued or
sold, any shares of Common Stock for a consideration per share less than the
Conversion Price in effect immediately prior to the time of such issue or sale,
then, forthwith upon such issue or sale, the Conversion Price shall be reduced
to the price determined by dividing (i) an amount equal to the sum of (a) the
number of shares of Common Stock outstanding immediately prior to such issue or
sale multiplied by the then existing Conversion Price and (b) the consideration,
if any, received by the Corporation upon such issue or sale, by (ii) the total
number of shares of Common Stock outstanding immediately after such issue or
sale.

                                       8
<PAGE>
 
     For purposes of this subparagraph 5D, the following subparagraphs 5D(1) to
5D(7) shall also be applicable:

     5D(1)   Issuance of Rights or Options. In case at any time the Corporation
             -----------------------------                                     
shall in any manner grant (whether directly or by assumption in a merger or
otherwise) any warrants or other rights to subscribe for or to purchase, or any
options for the purchase of, Common Stock or any stock or security convertible
into or exchangeable for Common Stock (such warrants, rights or options being
called "Options" and such convertible or exchangeable stock or securities being
called "Convertible Securities") whether or not such Options or the right to
convert or exchange any such Convertible Securities are immediately exercisable,
and the price per share for which Common Stock is issuable upon the exercise of
such Options or upon the conversion or exchange of such Convertible Securities
(determined by dividing (i) the total amount, if any, received or receivable by
the Corporation as consideration for the granting of such Options, plus the
minimum aggregate amount of additional consideration payable to the Corporation
upon the exercise of all such Options, plus, in the case of such Options which
relate to Convertible Securities, the minimum aggregate amount of additional
consideration, if any, payable upon the issue or sale of such Convertible
Securities and upon the conversion or exchange thereof, by (ii) the total
maximum number of shares of Common Stock issuable upon the exercise of such
Options or upon the conversion or exchange of all such Convertible Securities
issuable upon the exercise of such Options) shall be less than the Conversion
Price in effect immediately prior to the time of the granting of such Options,
then the total maximum number of shares of Common Stock issuable upon the
exercise of such Options or upon conversion or exchange of the total maximum
amount of such Convertible Securities issuable upon the exercise of such Options
shall be deemed to have been issued for such price per share as of the date of
granting of such Options or the issuance of such Convertible Securities and
thereafter shall be deemed to be outstanding. Except as otherwise provided in
subparagraph 5D(3), no adjustment of the Conversion Price shall be made upon the
actual issue of such Common Stock or of such Convertible Securities upon
exercise of such Options or upon the actual issue of such Common Stock upon
conversion or exchange of such Convertible Securities.

     5D(2)    Issuance of Convertible Securities. In case the Corporation shall
              ----------------------------------                               
in any manner issue (whether directly or by assumption in a merger or otherwise)
or sell any Convertible Securities, whether or not the rights to exchange or
convert any such Convertible Securities are immediately exercisable, and the
price per share for which Common Stock is issuable upon such conversion or
exchange (determined by dividing (i) the total amount received or receivable by
the Corporation as consideration for the issue or sale of such Convertible
Securities, plus the minimum aggregate amount of additional consideration, if
any, payable to the Corporation upon the conversion or exchange thereof, by 
(ii) the total maximum number of shares of Common Stock issuable upon the
conversion or exchange of all such Convertible Securities) shall be less than
the Conversion Price in effect immediately prior to the time of such issue or
sale, then the total maximum number of shares of Common Stock issuable upon
conversion or exchange of all such Convertible Securities shall be deemed to
have been issued for such price per share as of the date of the issue or sale of
such Convertible Securities and thereafter shall be deemed to be outstanding,
provided that (a) except as otherwise provided in subparagraph 5D(3), no
adjustment of the Conversion Price shall be made upon the actual issue of such
Common Stock upon conversion or exchange of such Convertible Securities and 
(b) if any such issue or sale of such Convertible Securities is made upon
exercise of any Options to purchase any such Convertible Securities for which
adjustments of the Conversion Price have been or are to be made pursuant

                                       9
<PAGE>
 
to other provisions of this subparagraph 5D, no further adjustment of the
Conversion Price shall be made by reason of such issue or sale.

     5D(3)   Change in Option Price or Conversion Rate. Upon the happening of
             -----------------------------------------                       
any of the following events, namely, if the purchase price provided for in any
Option referred to in subparagraph 5D(1), the additional consideration, if any,
payable upon the conversion or exchange of any Convertible Securities referred
to in subparagraph 5D(1) or 5D(2), or the rate at which Convertible Securities
referred to in subparagraph 5D(1) or 5D(2) are convertible into or exchangeable
for Common Stock shall change at any time (including, but not limited to,
changes under or by reason of provisions designed to protect against dilution),
the Conversion Price in effect at the time of such event shall forthwith be
readjusted to the Conversion Price which would have been in effect at such time
had such Options or Convertible Securities still outstanding provided for such
changed purchase price, additional consideration or conversion rate, as the case
may be, at the time initially granted, issued or sold, but only if as a result
of such adjustment the Conversion Price then in effect hereunder is thereby
reduced; and on the termination of any such Option or any such right to convert
or exchange such Convertible Securities, the Conversion Price then in effect
hereunder shall forthwith be increased to the Conversion Price which would have
been in effect at the time of such termination had such Option or Convertible
Securities, to the extent outstanding immediately prior to such termination,
never been issued.

     5D(4)   Consideration for Stock. In case any shares of Common Stock,
             -----------------------                                     
Options or Convertible Securities shall be issued or sold for cash, the
consideration received therefor shall be deemed to be the amount received by the
Corporation therefor, without deduction therefrom of any expenses incurred or
any underwriting commissions or concessions paid or allowed by the Corporation
in connection therewith. In case any shares of Common Stock, Options or
Convertible Securities shall be issued or sold for a consideration other than
cash, the amount of the consideration other than cash received by the
Corporation shall be deemed to be the fair value of such consideration as
determined in good faith by the Board of Directors of the Corporation, without
deduction of any expenses incurred or any underwriting commissions or
concessions paid or allowed by the Corporation in connection therewith. In case
any Options shall be issued in connection with the issue and sale of other
securities of the Corporation, together comprising one integral transaction in
which no specific consideration is allocated to such Options by the parties
thereto, such Options shall be deemed to have been issued for such consideration
as determined in good faith by the Board of Directors of the Corporation.

     5D(5) Record Date. In case the Corporation shall take a record of the
           -----------                                                    
holders of its Common Stock for the purpose of entitling them (i) to receive a
dividend or other distribution payable in Common Stock, Options or Convertible
Securities or (ii) to subscribe for or purchase Common Stock, Options or
Convertible Securities, then such record date shall be deemed to be the date of
the issue or sale of the shares of Common Stock deemed to have been issued or
sold upon the declaration of such dividend or the making of such other
distribution or the date of the granting of such right of subscription or
purchase, as the case may be.

     5D(6) Treasury Shares. The number of shares of Common Stock outstanding at
           ---------------                                                     
any given time shall not include shares owned or held by or for the account of
the Corporation, and the disposition of any such shares shall be considered an
issue or sale of Common Stock for the purpose of this subparagraph 5D(6)

                                       10
<PAGE>
 
     5E.  Certain Issues of Common Stock Excepted. Anything herein to the
          ---------------------------------------                        
contrary notwithstanding, the Corporation shall not be required to make any
adjustment of the Conversion Price in the case of the issuance from and after
the date of filing of these terms of the Series A Convertible Preferred Stock of
shares of Class B Common Stock issued upon the conversion of (a) shares of
Series A Convertible Preferred Stock or (b) shares of Class A Stock.

     5F.  Subdivision or Combination of Common Stock.  In case the Corporation
          ------------------------------------------                          
shall at any time subdivide (by any stock split, stock dividend or otherwise)
its outstanding shares of Common Stock into a greater number of shares, the
Conversion Price in effect immediately prior to such subdivision shall be
proportionately reduced, and, conversely, in case the outstanding shares of
Common Stock shall be combined into a smaller number of shares, the Conversion
Price in effect immediately prior to such combination shall be proportionately
increased.

     5G.  Reorganization or Reclassification.   If any capital reorganization or
          ----------------------------------                                    
reclassification of the capital stock of the Corporation shall be effected in
such a way that holders of Class B Stock shall be entitled to receive stock,
securities or assets with respect to or in exchange for Class B Stock, then, as
a condition of such reorganization or reclassification, lawful and adequate
provisions shall be made whereby each holder of a share or shares of Series A
Convertible Preferred Stock shall thereupon have the right to receive, upon the
basis and upon the terms and conditions specified herein and in lieu of the
shares of Class B Stock immediately theretofore receivable upon the conversion
of such share or shares of Series A Convertible Preferred Stock, such shares of
stock, securities or assets as may be issued or payable with respect to or in
exchange for a number of outstanding shares of such Class B Stock equal to the
number of shares of such Class B Stock immediately theretofore receivable upon
such conversion had such reorganization or reclassification not taken place, and
in any such case appropriate provisions shall be made with respect to the rights
and interests of such holder to the end that the provisions hereof (including
without limitation provisions for adjustments of the Conversion Price) shall
thereafter be applicable, as nearly as may be, in relation to any shares of
stock, securities or assets thereafter deliverable upon the exercise of such
conversion rights.

     5H.  Notice of Adjustment. Upon any adjustment of the Conversion Price,
          --------------------                                              
then and in each such case the Corporation shall give written notice thereof, by
delivery in person, certified or registered mail, return receipt requested,
telecopier or telex, addressed to each holder of shares of Series A Convertible
Preferred Stock at the address of such holder as shown on the books of the
Corporation, which notice shall state the Conversion Price resulting from such
adjustment, setting forth in reasonable detail the method upon which such
calculation is based.

     5I.  Other Notices. In case at any time:
          -------------                      

     (1)  the Corporation shall declare any dividend upon its Common Stock
payable in cash or stock or make any other distribution to the holders of its
Common Stock;

     (2)  the Corporation shall offer for subscription pro rata to the holders
of its Common Stock any additional shares of stock of any class or other rights;

     (3)  there shall be any capital reorganization or reclassification of the
capital stock of the Corporation, or a consolidation or merger of the
Corporation with or into another entity or

                                       11
<PAGE>
 
entities, or a sale, lease, abandonment, transfer or other disposition of all or
substantially all its assets; or

     (4)  there shall be a voluntary or involuntary dissolution, liquidation or
winding up of the Corporation;

then, in any one or more of said cases, the Corporation shall give, by delivery
in person, certified or registered mail, return receipt requested, telecopier or
telex, addressed to each holder of any shares of Series A Convertible Preferred
Stock at the address of such holder as shown on the books of the Corporation,
(a) at least 20 days' prior written notice of the date on which the books of the
Corporation shall close or a record shall be taken for such dividend,
distribution or subscription rights or for determining rights to vote in respect
of any such reorganization, reclassification, consolidation, merger,
disposition, dissolution, liquidation or winding up and (b) in the case of any
such reorganization, reclassification, consolidation, merger, disposition,
dissolution, liquidation or winding up, at least 20 days' prior written notice
of the date when the same shall take place. Such notice in accordance with the
foregoing clause (a) shall also specify, in the case of any such dividend,
distribution or subscription rights, the date on which the holders of Common
Stock shall be entitled thereto and such notice in accordance with the foregoing
clause (b) shall also specify the date on which the holders of Common Stock
shall be entitled to exchange their Common Stock for securities or other
property deliverable upon such reorganization, reclassification, consolidation,
merger, disposition, dissolution, liquidation or winding up, as the case may be.

     5J.  Stock to be Reserved. The Corporation will at all times reserve and
          --------------------                                               
keep available out of its authorized Class B Stock, solely for the purpose of
issuance upon the conversion of Series A Convertible Preferred Stock as herein
provided, such number of shares of Class B Stock as shall then be issuable upon
the conversion of all outstanding shares of Series A Convertible Preferred
Stock. The Corporation covenants that all shares of Class B Stock which shall be
so issued shall be duly and validly issued and fully paid and nonassessable and
free from all taxes, liens and charges with respect to the issue thereof, and,
without limiting the generality of the foregoing, the Corporation covenants that
it will from time to time take all such action as may be requisite to assure
that the par value per share of the Common Stock is at all times equal to or
less than the Conversion Price in effect at the time. The Corporation will take
all such action as may be necessary to assure that all such shares of Common
Stock may be so issued without violation of any applicable law or regulation, or
of any requirement of any national securities exchange upon which the Common
Stock may be listed. The Corporation will not take any action which results in
any adjustment of the Conversion Price if the total number of shares of Class B
Stock issued and issuable after such action upon conversion of the Series A
Convertible Preferred Stock would exceed the total number of shares of Class B
Stock then authorized by the Certificate of Incorporation.

     5K.  No Reissuance of Series A Convertible Preferred Stock. Shares of
          -----------------------------------------------------           
Series A Convertible Preferred Stock which are converted into shares of Class B
Stock as provided herein shall not be reissued.

     5L.  Issue Tax. The issuance of certificates for shares of Class B Stock
          ---------                                                          
upon conversion of Series A Convertible Preferred Stock shall be made without
charge to the holders thereof for any issuance tax in respect thereof, provided
that the Corporation shall not be required to pay any

                                       12
<PAGE>
 
tax which may be payable in respect of any transfer involved in the issuance and
delivery of any certificate in a name other than that of the holder of the
Series A Convertible Preferred Stock which is being converted.

     5M.  Closing of Books. The Corporation will at no time close its transfer
          ----------------                                                    
books against the transfer of any Series A Convertible Preferred Stock or of any
shares of Class B Stock issued or issuable upon the conversion of any shares of
Series A Convertible Preferred Stock in any manner which interferes with the
timely conversion of such Series A Convertible Preferred Stock, except as may
otherwise be required to comply with applicable securities laws.

     5N.  Definition of Common Stock. As used in this paragraph 5, the term
          --------------------------                                       
"Common Stock" shall mean and include the Corporation's authorized Class A
Common Stock, par value $.01 per share, and the Corporation's authorized Class B
Common Stock, par value $.01 per share, as constituted on the date of filing of
these terms of the Series A Convertible Preferred Stock, and shall also include
any capital stock of any class of the Corporation thereafter authorized which
shall not be limited to a fixed sum or percentage in respect of the rights of
the holders thereof to participate in dividends or in the distribution of assets
upon the voluntary or involuntary liquidation, dissolution or winding up of the
Corporation; provided that the shares of Class B Stock receivable upon
conversion of shares of Series A Convertible Preferred Stock shall include only
shares designated as Class B Stock of the Corporation on the date of filing of
this instrument, or in case of any reorganization or reclassification of the
outstanding shares thereof, the stock, securities or assets provided for in
subparagraph 6G.

     50.  Mandatory Conversion. If at any time the Corporation shall effect a
          --------------------                                               
firm commitment underwritten public offering of shares of Common Stock in which
(i) the aggregate net proceeds to the Corporation after deducting underwriters
commissions and discounts shall be at least $10,000,000 and (ii) the price paid
by the public for such shares shall be at least $100 per share (appropriately
adjusted to reflect the occurrence of any event described in subparagraph 5F),
then effective upon the closing of the sale of such shares by the Corporation
pursuant to such public offering, all outstanding shares of Series A Convertible
Preferred Stock shall automatically convert to shares of Class B Stock on the
basis set forth in this paragraph 5. Holders of shares of Series A Convertible
Preferred Stock so converted may deliver to the Corporation at its principal
office (or such other office or agency of the Corporation as the Corporation may
designate by notice in writing to such holders) during its usual business hours,
the certificate or certificates for the shares so converted. As promptly as
practicable thereafter, the Corporation shall issue and deliver to such holder a
certificate or certificates for the number of whole shares of Class B Stock to
which such holder is entitled, together with any cash dividends and payment in
lieu of fractional shares to which such holder may be entitled pursuant to
subparagraph 5C. Until such time as a holder of shares of Series A Convertible
Preferred Stock shall surrender his or its certificates therefor as provided
above, such certificates shall be deemed to represent the shares of Class B
Stock to which such holder shall be entitled upon the surrender thereof.

     6A.  Mandatory Redemption. On or after December 31, 2001, the Corporation
          --------------------                                                
shall redeem from each holder of shares of Series A Convertible Preferred Stock,
at such holder's option, all of the shares of Series A Convertible Preferred
Stock held by such holder on the Redemption Date (as defined below).

                                       13
<PAGE>
 
     6B.  Redemption Price and Payment. The Series A Convertible Preferred Stock
          ----------------------------                                          
to be redeemed on the Redemption Date shall be redeemed by paying for each share
in cash an amount equal to $6.00 per share plus, in the case of each share, an
amount equal to all dividends declared but unpaid thereon, computed to the
Redemption Date, such amount being referred to as the "Redemption Price". Such
payment shall be made in full on the Redemption Date to the holders entitled
thereto.

     6C.  Redemption Mechanics. Any holder of Series A Convertible Preferred
          --------------------                                              
Stock desiring to exercise its option under Paragraph 6A shall provide written
notice (the "Redemption Notice") to the Corporation indicating (a) the number of
Series A Convertible Preferred Shares held by such holder and (b) the date on
which such redemption shall take place (the "Redemption Date"), which Redemption
Date shall not be less than 45 days from the date the Redemption Notice is
delivered to the Corporation by delivery in person, certified or registered
mail, return receipt requested, telecopier or telex. Within five (5) days of
receipt of any Redemption Notice, the Corporation shall send written notice to
all other holders of record of shares of Series A Convertible Preferred Stock of
the receipt (and the contents of) such Redemption Notice. Any such holder may,
by delivery of a Redemption Notice within thirty (30) days of receipt of such
notice from the Corporation, elect to have all of its shares of Series A
Convertible Preferred Stock redeemed on the Redemption Date indicated in the
Redemption Notice previously received by the Corporation. The Redemption Price
shall be payable to each holder at it or his address as shown by the records of
the Corporation. From and after the close of business on the Redemption Date,
unless there shall have been a default in the payment of the Redemption Price,
all rights of holders of shares of Series A Convertible Preferred Stock
requesting redemption (except the right to receive the Redemption Price) shall
cease with respect to such shares, and such shares shall not thereafter be
transferred on the books of the Corporation or be deemed to be outstanding for
any purpose whatsoever. If the funds of the Corporation legally available for
redemption of shares of Series A Convertible Preferred Stock on any Redemption
Date are insufficient to redeem the total number of outstanding shares o Series
A Convertible Preferred Stock, the holders of shares of Series A Convertible
Preferred Stock for which the Corporation has received a Redemption Notice shall
share ratably in any funds legally available for redemption of such shares
according to the respective amounts which would be payable with respect to the
full number of shares owned by them if all such outstanding shares were redeemed
in full. The shares of Series A Convertible Preferred Stock not redeemed shall
remain outstanding and entitled to all rights and preferences provided herein.
At any time thereafter when additional funds of the Corporation are legally
available for the redemption of such shares of Series A Convertible Preferred
Stock, such funds will be used, at the end of the next succeeding fiscal
quarter, to redeem the balance of such shares, or such portion thereof for which
funds are then legally available, on the basis set forth above.

     6D.  Redeemed or Otherwise Acquired Shares to be Retired. Any shares of
          ---------------------------------------------------               
Series A Convertible Preferred Stock redeemed pursuant to this paragraph 6 or
otherwise acquired by the Corporation in any manner whatsoever shall be canceled
and shall not under any circumstances be reissued; and the Corporation may from
time to time take such appropriate corporate action as may be necessary to
reduce accordingly the number of authorized shares of Series A Convertible
Preferred Stock.

     7.   Restrictions and Limitations.
          ---------------------------- 

                                       14
<PAGE>
 
     (a)  Corporate Actions: Amendments to Charter. The Corporation will not
          ----------------------------------------                          
amend its Certificate of Incorporation or take any other corporate action
without the approval by the holders of at least 66.67% of the then outstanding
shares of Series A Convertible Preferred Stock, voting or consenting separately
as a series, if such amendment or corporate action would:

          (i)    adversely affect or significantly alter the rights (including
but not limited to rights to a liquidation preference, dividend rights, voting
rights, Board representation rights and conversion rights) of the holders of the
Series A Convertible Preferred Stock;

          (ii)   create, authorize the creation of or obligate the Corporation
to authorize the creation of additional shares of Class A Stock or capital stock
senior to or on a parity with the Series A Convertible Preferred Stock (or
securities convertible into such shares), or increase the authorized amount of
Series A Convertible Preferred Stock (or securities convertible into shares of
Series A Convertible Preferred Stock); or

          (iii)  issue or grant any shares of Common Stock or of warrants,
options or other rights to purchase or acquire Common Stock except for the
issuance of shares of Common Stock upon the conversion of shares of Series A
Convertible Preferred Stock pursuant to the terms hereof and the issuance of
Series A Convertible Preferred Stock upon conversion of the Convertible Notes.

     (b)  Additional Limitations.  For so long as 25% of the shares of Series A
          ----------------------                                               
Convertible Preferred Stock initially issued remain outstanding, the Corporation
will not, without the approval of the holders of at least 66.67% of the then
outstanding shares of Series A Convertible Preferred Stock:

          (i)    Issue any debt securities which are convertible into,
exchangeable for or otherwise entitle the holder to receive equity securities of
the Corporation, other than securities which are issued in connection with
borrowing by the Corporation from banks or other institutional lenders except
for an aggregate of up to $10,000,000 in principal amount of Convertible Secured
Subordinated Notes issued to the original holders of Series A Convertible
Preferred Stock;

          (ii)   redeem, purchase or otherwise acquire for value (or pay into or
set aside a sinking fund for such purpose) any shares of Common Stock; or

          (iii)  merge or consolidate with any other corporation, if at least a
majority of the voting power of the Corporation, or the surviving corporation
after such merger or consolidation, as the case may be, would not be owned by
the holders of the capital stock of the Corporation before such merger or
consolidation.

     8.   Amendments. No provision of these terms of the Series A Convertible
          ----------                                                         
Preferred Stock may be amended, modified or waived without the written consent
or affirmative vote of the holders of at least 66.67% of the then outstanding
shares of Series A Convertible Preferred Stock.

                                       15
<PAGE>
 
     FIFTH.   The Board of Directors of the Corporation is expressly authorized
to adopt, amend or repeal by-laws of the Corporation with the vote or written
consent of two-thirds of the members of the Board of Directors, subject to any
rights of holders of Preferred Stock.

     SIXTH.  The number of directors of the Corporation shall at any time be
seven (7). Elections of directors need not be by written ballot except and to
the extent provided in the by laws of the Corporation.

     SEVENTH.  The Corporation shall, to the maximum extent permitted from time
to time under the laws of the State of Delaware, indemnify and upon request
shall advance expenses to any person who is or was a party or is threatened to
be made a party to any threatened, pending or completed action, suit, proceeding
or claim, whether civil, criminal, administrative or investigative, by reason of
the fact that he is or was or has agreed to be a director, officer of the
Corporation or while a director or officer is or was serving at the request of
the Corporation as a director, officer, partner, trustee, employee or agent of
any corporation, partnership, joint venture, trust or other enterprise,
including service with respect to employee benefit plans, against any and all
expenses (including attorney's fees and expenses), judgments, fines, penalties
and amounts paid in settlement or incurred in connection with the investigation,
preparation to defend or defense of such action, suit, proceeding or claim;
provided, however, that the foregoing shall not require the Corporation to
indemnify or advance expenses to any person in connection with any action, suit,
proceeding, claim or counterclaim initiated by or on behalf of such person. Such
indemnification shall not be exclusive of other indemnification rights arising
under any by-law, agreement, vote of directors or stockholders or otherwise and
shall inure to the benefit of the heirs and legal representatives of such
person. Any repeal or modification of the foregoing provisions of this Article
Seventh shall not adversely affect any right or protection of a director or
officer of this Corporation existing at the time of such repeal or modification.

     EIGHTH. A director of the Corporation shall not be liable to the
Corporation or its stockholders for monetary damages for breach of fiduciary
duty as a director, except to the extent that such exemption from liability or
limitation thereof is not permitted under the Delaware General Corporation Law
as currently in effect or as the same may hereafter be amended. No amendment,
modification or repeal of this Article EIGHTH shall adversely affect any right
or protection of a director that exists at the time of such amendment,
modification or repeal.

     NINTH.  The Corporation is to have perpetual existence.

     TENTH. The names and mailing addresses of the persons who are to serve as
directors of the Corporation until the first annual meeting of stockholders or
until their successors are elected and qualify are as follows:

<TABLE>
<CAPTION>
 
         Name                              Address                   
         ----                              -------                   

         <S>                               <C>                       
         Ted B. Miller, Jr.                510 Bering Dr., Suite 310 
                                           Houston, Texas 77057      
                                                                     
         Edward C. Hutcheson, Jr.          510 Bering Dr., Suite 310 
                                           Houston, Texas 77057       
</TABLE>

                                       16
<PAGE>
 
<TABLE>
         <S>                               <C> 
         Jeffrey Schutz                    1999 Broadway, Suite 2100
                                           Denver, Colorado 80202
 
         Carl Ferenbach                    One Boston Place, Suite 3425
                                           Boston, Massachusetts 02108

         J. Landis Martin                  150 Vine Street
                                           Denver, Colorado 80206
</TABLE> 

     ELEVENTH. The name and mailing address of the incorporator is as follows:

<TABLE> 
<CAPTION> 
                     Name                              Address
                     ----                              -------

         <S>                               <C> 
         William T. Heller IV, Esq.        Brown, Parker & Leahy, L.L.P.
                                           1200 Smith Street, Suite 3600
                                           Houston, Texas 77002
</TABLE> 

     IN WITNESS WHEREOF, the undersigned has set his hand, this the 26th day of 
April, 1995.


Attest:                                    CASTLE TOWER HOLDING CORP.


         Illegible                         /s/ TED B. MILLER
- ----------------------------------         -------------------------------------
Secretary                                  Ted B. Miller, Vice President

 



THE STATE OF TEXAS   (S)
                     (S)
COUNTY OF HARRIS     (S)

     BE IT REMEMBERED that on this 26th day of April, 1995, personally came
before me, a Notary Public for the State of Texas, Ted B. Miller, the party to
the foregoing certificate of incorporation, known to me personally to be such,
and acknowledged the said certificate to be his act and deed and that the facts
stated therein are true.

     GIVEN under my hand and seal of office the day and year aforesaid.


                                           /s/ ROBERT C. WALKER
                                           -------------------------------------
                                           Robert C. Walker, Notary
                                           ----------------
                                           Public in and for the
                                           State of  T E X A S

                                       17

<PAGE>
 
                                                                   Exhibit 3.2

                          CERTIFICATE OF  AMENDMENT OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                           CASTLE TOWER HOLDING CORP.


     Castle Tower Holding Corp., a corporation organized and existing and by
virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), DOES HEREBY CERTIFY:

     FIRST:  That the Board of Directors of said Corporation by Unanimous
Written Consent, adopted the following resolution:

          RESOLVED, that the Corporation amend Article FOURTH of its Certificate
     of Incorporation as on file with the Secretary of State of Delaware to read
     in its entirety as set forth below:

     FOURTH: The Corporation shall be authorized to issue 7,770,000 shares of
capital stock, which shall be divided into 270,000 shares of Class A Common
Stock, with a par value of one cent ($.01) per share (the "Class A Stock"),
5,000,000 shares of Class B Common Stock, with a par value of one cent ($.01)
per share (the "Class B Stock"), and 2,500,000 shares of Preferred Stock, with a
par value of one cent ($.01) per share (the "Preferred Stock").

     The following is a statement of the designations, preferences, voting
powers, qualifications, special or relative rights and privileges in respect of
the authorized capital stock of the Corporation.

I.   CLASS A COMMON STOCK AND CLASS B COMMON STOCK
     ---------------------------------------------

     1.   Except as specifically set forth herein, the rights of the holders of
Class A Stock and Class B Stock shall be identical, and the Class A Stock and
Class B Stock shall be treated as a single class of Common Stock and shall be
referred to herein collectively as the "Common Stock." The voting, dividend and
liquidation rights of the holders of the Class A Stock and Class B Stock are
subject to and qualified by the rights of the holders of the Preferred Stock.

     2.   Voting.   The holders of the Class B Stock are entitled to one vote
          ------                                                             
for each share held at all meetings of stockholders (and written actions in lieu
of meetings). The holders of Class A Stock are entitled to such number of votes
per share of Class A Stock as shall equal the number of shares of Class B Stock
(including fractions of a share) into which each share of Class A Stock is then
convertible. There shall be no cumulative voting.

     3.   Dividends.  Dividends may be declared and paid on the Class A Stock
          ---------                                                          
and Class B Stock from funds lawfully available therefor as and when determined
by the Board of Directors and subject to any preferential dividend rights of any
then outstanding Preferred Stock. Any dividend declared by the Board of
Directors shall be declared and paid upon the outstanding shares of Class A
Stock and Class B Stock in equal amounts per share (treating each share of Class
A Stock as being equal to the number of shares of Class B Stock (including
fractions of a share) into which each share of Class A Stock is then
convertible) and without preference or
<PAGE>
 
priority of either the Class A Stock or the Class B Stock over the other,
provided that dividends payable in stock of the Corporation may be declared and
paid on the Class A Stock in shares of Class A Stock and on the Class B Stock in
shares of Class B Stock.

     4.   Liquidation. Dissolution or Winding Up. In the event of any voluntary
          --------------------------------------                               
or involuntary liquidation, dissolution or winding up on the Corporation, after
payment of all preferential amounts required to be paid to the holders of
Preferred Stock, the holders of shares of Class A Stock and Class B Stock then
outstanding shall share ratably in any distribution of the remaining assets and
funds of the Corporation in proportion to the respective amounts which would
otherwise be payable in respect of the shares held by them upon such
distribution if all amounts payable on or with respect to such shares were paid
in full. For this purpose, each share of Class A Stock shall be entitled to
receive the amount which would be payable shares of Class B Stock issued on
conversion of such Class A Stock if such conversion had occurred immediately
prior to such distribution.

5.   Conversion of Class A Stock.
     --------------------------- 

     5A.  Optional Conversion. Each share of Class A Stock shall be convertible,
          -------------------                                                   
at the option of the holder, at any time and from time to time, into 1.5231
shares of fully paid and non assessable shares of Class B Stock ("Class A
Conversion Rate").

     5B.  Mandatory Conversion. The Corporation may, at its option, require all
          --------------------                                                 
(and not less than all) holders of shares of Class A Stock then outstanding to
convert their shares of Class A Stock into shares of Class B Stock, at the then
effective Class A Conversion Rate pursuant to Section 5A, simultaneously with
the conversion of outstanding shares of Series A Convertible Preferred Stock
pursuant to Section II.5O. of this Article Fourth. All holders of record of
shares of Class A Stock will be given at least 10 days' prior written notice of
the date fixed and the place designated for mandatory conversion of all such
shares of Class A Stock. Such notice will be sent by first class or registered
mail, postage prepaid, to each record holder of Class A Stock at such holder's
address last shown on the records of the transfer agent for the Class A Stock
(or the records of the Corporation, if it serves as its own transfer agent). On
or before the date fixed for conversion, each holder of shares of Class A Stock
shall surrender his or its certificate or certificates for all such shares to
the Corporation at the place designated in such notice, and shall thereafter
receive certificates for the number of shares of Class B Stock to which such
holder is entitled. On the date fixed for conversion, all rights with respect to
the Class A Stock so converted, including the rights, if any, to receive notices
and vote, will terminate, except only the rights of the holders thereof, upon
surrender of their certificate or certificates thereof, to receive certificates
for the number of shares of Class B Stock into which such Class A Stock has been
converted. If so required by the Corporation, certificates surrendered for
conversion shall be endorsed or accompanied by written instrument or instruments
of transfer, in form reasonably satisfactory to the Corporation, duly executed
by the registered holder or by his or its attorney duly authorized in writing.
As promptly as practicable after the date of such mandatory conversion and the
surrender of the certificate or certificates for Class A Stock, the Corporation
shall cause to be issued and delivered to such holder, or on his or its written
order, a certificate or certificates for the number of full shares of Class B
Stock issuable on such conversion in accordance with the provisions hereof. All
certificates evidencing shares of Class A Stock which are required to be
surrendered for conversion in accordance with the provisions hereof shall, from
and after the date such certificates are so required to be surrendered, be
deemed to have been

                                       2
<PAGE>
 
retired and canceled and the shares of Class A Stock represented thereby
converted into Class B Stock for all purposes, notwithstanding the failure of
the holder or holders thereof to surrender such certificates on or prior to such
date. The Corporation may thereafter take such appropriate action as may be
necessary to reduce the authorized Class A Stock accordingly.

     5C.  Fractional Shares: Partial Conversion. No fractional shares shall be
          -------------------------------------                               
issued upon conversion of Class A Stock into Class B Stock.  In case the number
of shares of Class A Stock represented by the certificate or certificates
surrendered pursuant to subparagraph 5A exceeds the number of shares converted,
the Corporation shall, upon such conversion, execute and deliver to the holder,
at the expense of the Corporation, a new certificate or certificates for the
number of shares of Class A Stock represented by the certificate or certificates
surrendered which are not to be converted. If any fractional share of Class B
Stock would, except for the provisions of the first sentence of this
subparagraph 5D, be delivered upon such conversion, the Corporation, in lieu of
delivering such fractional share, shall pay to the holder surrendering the Class
A Stock for conversion an amount in cash equal to the current market price of
such fractional share as determined in good faith by the Board of Directors of
the Corporation without minority, marketability or similar discounts. In the
event of a liquidation of the Corporation, the aforesaid conversion rights shall
terminate at the close of business on the first full day preceding the date
fixed for the payment of any amounts distributable on liquidation to the holders
of Class A Stock. In order for a holder of Class A Stock to convert shares of
Class A Stock into shares of Class B Stock, such holder shall surrender the
certificate or certificates for such shares of Class A Stock, at the office of
the transfer agent for the Class A Stock (or at the principal office of the
Corporation if the Corporation serves as its own transfer agent), together with
written notice that such holder elects to convert all or any number of the
shares of Class A Stock represented by such certificate or certificates. Such
notice shall state such holder's name or the names of the nominees in which such
holder wishes the certificate or certificates for shares of Class B Stock to be
issued. If required by the Corporation, certificates surrendered for conversion
shall be endorsed or accompanied by a written instrument or instruments of
transfer, in form satisfactory to the Corporation, duly executed by the
registered holder or his or its attorney duly authorized in writing. The date of
receipt of such certificates and notice by the transfer agent (or by the
Corporation if the Corporation serves as its own transfer agent) shall be the
conversion date ("Class A Stock Conversion Date"). The Corporation shall, as
soon as practicable after the Class A Conversion Date, issue and deliver at such
office to such holder of Class A Stock, or to his or its nominees, a certificate
or certificates for the number of shares of Class B Stock to which such holder
shall be entitled. The Corporation shall at all times when the Class A Stock
shall be outstanding, reserve and keep available out of its authorized but
unissued stock, for the purpose of effecting the conversion of the Class A
Stock, such number of its duly authorized shares of Class B Stock as shall from
time to time be sufficient to effect the conversion of all outstanding Class A
Stock. All shares of Class A Stock which shall have been surrendered for
conversion as herein provided shall no longer be deemed to be outstanding and
all rights with respect to such shares, including the rights, if any, to receive
notices and to vote, shall immediately cease and terminate on the Class A Stock
Conversion Date, except only the right of the holders thereof to receive shares
of Class B Stock in exchange therefor. Any shares of Class A Stock so converted
shall be retired and canceled and shall not be reissued, and the Corporation may
from time to time take such appropriate action as may be necessary to reduce the
authorized Class A Stock accordingly.

                                       3
<PAGE>
 
     5D.  Subdivision or Combination of Class B Stock.  In case the Corporation
          -------------------------------------------                          
shall at any time subdivide (by any stock split, stock dividend or otherwise)
its outstanding shares of Class B Stock into a greater number of shares, the
Class A Conversion Rate pursuant to Section 5A shall be proportionately
increased, and, conversely, in case the outstanding shares of Class B Stock
shall be combined into a smaller number of shares, the conversion rate shall be
proportionately reduced.

     5E.  Reorganization or Reclassification.  If any capital reorganization or
          ----------------------------------                                   
reclassification of the capital stock of the Corporation shall be effected in
such a way that holders of Class B Stock shall be entitled to receive stock,
securities or assets with respect to or in exchange for Class B Stock, then, as
a condition of such reorganization or reclassification, lawful and adequate
provisions shall be made whereby each holder of a share or shares of Class A
Stock shall thereupon have the right to receive, upon the basis and upon the
terms and conditions specified herein and in lieu of the shares of Class B Stock
immediately theretofore receivable upon the conversion of such share or shares
of Class A Stock, such shares of stock, securities or assets as may be issued or
payable with respect to or in exchange for a number of outstanding shares of
such Class B Stock equal to the number of shares of such Class B Stock
immediately theretofore receivable upon such conversion had such reorganization
or reclassification not taken place, and in any such case appropriate provisions
shall be made with respect to the rights and interests of such holder to the end
that the provisions hereof (including without limitation provisions for
adjustments of the Class A Conversion Rate) shall thereafter be applicable, as
nearly as may be, in relation to any shares of stock, securities or assets
thereafter deliverable upon the exercise of such conversion rights.

     5F.  Notice of Adjustment. Upon any adjustment of the Class A Conversion
          --------------------                                               
Rate, then and in each such case the Corporation shall give written notice
thereof, by delivery in person, certified or registered mail, return receipt
requested, telecopier or telex, addressed to each holder of shares of Class A
Stock at the address of such holder as shown on the books of the Corporation,
which notice shall state the conversion rate resulting from such adjustment,
setting forth in reasonable detail the method upon which such calculation is
based.

     5G.  Other Notices.  In case at any time:
          -------------                       

     (1)  the Corporation shall declare any dividend upon its Class B Stock
payable in cash or stock or make any other distribution to the holders of its
Class B Stock;

     (2)  the Corporation shall offer for subscription pro rata to the holders
of its Class B Stock any additional shares of stock of any class or other
rights;

     (3)  there shall be any capital reorganization or reclassification of the
capital stock of the Corporation, or a consolidation or merger of the
Corporation with or into another entity or entities, or a sale, lease,
abandonment, transfer or other disposition of all or substantially all its
assets; or

     (4) there shall be a voluntary or involuntary dissolution, liquidation or
winding up of the Corporation; then, in any one or more of said cases, the
Corporation shall give, by delivery in person, certified or registered mail,
return receipt requested, telecopier or telex, addressed to each holder of any
shares of Class A Stock at the address of such holder as shown on the books

                                       4
<PAGE>
 
of the Corporation, (a) at least 20 days' prior written notice of the date on
which the books of the Corporation shall close or a record shall be taken for
such dividend, distribution or subscription rights or for determining rights to
vote in respect of any such reorganization, reclassification, consolidation,
merger, disposition, dissolution, liquidation or winding up and (b) in the case
of any such reorganization, reclassification, consolidation, merger,
disposition, dissolution, liquidation or winding up, at least 20 days' prior
written notice of the date when the same shall take place. Such notice in
accordance with the foregoing clause (a) shall also specify, in the case of any
such dividend, distribution or subscription rights, the date on which the
holders of Class B Stock shall be entitled thereto and such notice in accordance
with the foregoing clause (b) shall also specify the date on which the holders
of Class B Stock shall be entitled to exchange their Class B Stock for
securities or other property deliverable upon such reorganization,
reclassification, consolidation, merger, disposition, dissolution, liquidation
or winding up, as the case may be.

     5H.  Stock to be Reserved.  The Corporation will at all times reserve and
          --------------------                                                
keep available out of its authorized Class B Stock, solely for the purpose of
issuance upon the conversion of Class A Stock as herein provided, such number of
shares of Class B Stock as shall then be issuable upon the conversion of all
outstanding shares of Class A Stock. The Corporation covenants that all shares
of Class B Stock which shall be so issued shall be duly and validly issued and
fully paid and nonassessable and free from all taxes, liens and charges with
respect to the issue thereof. The Corporation will take all such action as may
be necessary to assure that all such shares of Class B Stock may be so issued
without violation of any applicable law or regulation, or of any requirement of
any national securities exchange upon which the Class B Stock may be listed. The
Corporation will not take any action which results in any adjustment of the
Class A Conversion Rate if the total number of shares of Class B Stock issued
and issuable after such action upon conversion of the Class A Stock would exceed
the total number of shares of Class B Stock then authorized by the Certificate
of Incorporation.

     5I.  No Reissuance of Class A Stock. Shares of Class A Stock which are
          ------------------------------                                   
converted into shares of Class B Stock as provided herein shall not be reissued.

II.  SERIES A CONVERTIBLE PREFERRED STOCK
     ------------------------------------

     1.   Number of Shares. There shall be a series of Preferred Stock
          ----------------                                            
designated and known as "Series A Convertible Preferred Stock" which shall
consist of 1,500,000 shares.

     2.   Voting.
          ------ 

     2A.  General. Except as may be otherwise provided in these terms of the
          -------                                                           
Series A Convertible Preferred Stock or by law, the Series A Convertible
Preferred Stock shall vote together with all other classes and series of stock
of the Corporation as a single class on all actions to be taken by the
stockholders of the Corporation. Each share of Series A Convertible Preferred
Stock shall entitle the holder thereof to such number of votes per share on each
such action as shall equal the number of shares of Class B Stock (including
fractions of a share) into which each share of Series A Convertible Preferred
Stock is then convertible.

                                       5
<PAGE>
 
     2B.  Board Size. The Corporation shall not, without the written consent or
          ----------                                                           
affirmative vote of the holders of at least two-thirds of the then outstanding
shares of Series A Convertible Preferred Stock and Series B Convertible
Preferred Stock (as defined in Section III of this Article Fourth), voting
together, consenting or voting (as the case may be) separately from all other
classes or series of capital stock, increase the maximum number of directors
constituting the Board of Directors to a number in excess of seven (7).

     2C.  Board Seats. The holders of the Series A Convertible Preferred Stock
          -----------                                                         
and Series B Convertible Preferred Stock, voting together, separately from all
other classes and series of capital stock of the Corporation shall be entitled
to elect two (2) directors of the Corporation. The holders of the Class A Stock
voting as a separate class, shall be entitled to elect two (2) directors of the
Corporation. The holders of the Series A Convertible Preferred Stock, Series B
Convertible Preferred Stock and both classes of Common Stock, voting together as
a single class, shall be entitled to elect three (3) directors of the
Corporation (with each share of Series A Convertible Preferred Stock and Series
B Convertible Preferred Stock entitled to that number of votes per share on each
such action as shall equal the number of shares of Class B Stock (including
fractions of a share) into which each share of Series A Convertible Preferred
Stock and Series B Convertible Preferred Stock is then convertible.) At any
meeting (or in a written consent in lieu thereof) held for the purpose of
electing directors, the presence in person or by proxy (or the written consent)
of the holders of a majority of the shares of Series A Convertible Preferred
Stock and Series B Convertible Preferred Stock then outstanding shall constitute
a quorum of the Series A Convertible Preferred Stock and Series B Convertible
Preferred Stock for the election of directors to be elected solely by the
holders of the Series A Convertible Preferred Stock and Series B Convertible
Preferred Stock or jointly by the holders of the Series A Convertible Preferred
Stock, Series B Convertible Preferred Stock and the Common Stock.  A vacancy in
any directorship elected by the holders of the Series A Convertible Preferred
Stock and Series B Convertible Preferred Stock shall be filled only by vote or
written consent of the holders of the Series A Convertible Preferred Stock and
Series B Convertible Preferred Stock, a vacancy in any directorship elected by
the holders of the Class A Stock shall be filled only by vote or written consent
of the holders of the Class A Stock and a vacancy in any directorship elected
jointly by the holders of the Series A Convertible Preferred Stock, Series B
Convertible Preferred Stock and the Common Stock shall be filled only by vote or
written consent of the holders of Series A Convertible Preferred Stock, Series B
Convertible Preferred Stock and the Common Stock as provided above.

     3.   Dividends. The holders of the Series A Convertible Preferred Stock
          ---------                                                         
shall be entitled to receive, out of funds legally available therefore, and the
Company shall declare and pay dividends on the Series A Convertible Preferred
Stock at the same rate as dividends (other than dividends payable in additional
shares of Common Stock) are declared and paid with respect to the Common Stock
(treating each share of Series A Convertible Preferred Stock as being equal to
the number of shares of Common Stock (including fractions of a share) into which
each share of Series A Convertible Preferred Stock is then convertible).

     4.   Liquidation. Subject to the senior liquidation rights of the Series B
          -----------                                                          
Convertible Preferred Stock as set forth in Section III of this Article Fourth,
upon any liquidation, dissolution or winding up of the Corporation, whether
voluntary or involuntary, the holders of the shares of Series A Convertible
Preferred Stock shall be entitled, before any distribution or payment is made
upon any stock ranking on liquidation junior to the Series A Convertible
Preferred Stock, to be

                                       6
<PAGE>
 
paid an amount equal to the greater of (i) $6.00 per share plus, in the case of
each share, an amount equal to all dividends declared but unpaid thereon,
computed to the date payment thereof is made available, or (ii) such amount per
share as would have been payable had each such share been converted to Common
Stock pursuant to paragraph 5 of this Section II immediately prior to such
liquidation, dissolution or winding up, and the holders of Series A Convertible
Preferred Stock shall not be entitled to any further payment, such amount
payable with respect to one share of Series A Convertible Preferred Stock being
sometimes referred to as the "Series A Liquidation Payment" and with respect to
all shares of Series A Convertible Preferred Stock being sometimes referred to
as the "Series A Liquidation Payments". If upon such liquidation, dissolution or
winding up of the Corporation, whether voluntary or involuntary, the assets to
be distributed among the holders of Series A Convertible Preferred Stock shall
be insufficient to permit payment to the holders of Series A Convertible
Preferred Stock of the amount distributable as aforesaid, then the entire assets
of the Corporation available to be so distributed if any shall be distributed
ratably among the holders of Series A Convertible Preferred Stock. Upon any such
liquidation, dissolution or winding up of the Corporation, after the holders of
Series A Convertible Preferred Stock shall have been paid in full the amounts to
which they shall be entitled, the remaining net assets of the Corporation may be
distributed to the holders of stock ranking on liquidation junior to the Series
A Convertible Preferred Stock. Written notice of such liquidation, dissolution
or winding up, stating a payment date, the amount of the Series A Liquidation
Payments and the place where said Series A Liquidation Payments shall be
payable, shall be delivered in person, mailed by certified or registered mail,
return receipt requested, or sent by telecopier or telex, not less than 20 days
prior to the payment date stated therein, to the holders of record of Series A
Convertible Preferred Stock, such notice to be addressed to each such holder at
its address as shown by the records of the Corporation. The consolidation or
merger of the Corporation into or with any other entity or entities which
results in the exchange of outstanding shares of the Corporation for securities
or other consideration issued or paid or caused to be issued or paid by any such
entity or affiliate thereof (other than a merger to reincorporate the
Corporation in a different jurisdiction), and the sale, lease, abandonment,
transfer or other disposition by the Corporation of all or substantially all its
assets, shall be deemed to be a liquidation, dissolution or winding of the
Corporation within the meaning of the provisions of this paragraph 4. For
purposes hereof, the Common Stock shall rank on liquidation junior to the Series
A Convertible Preferred Stock and the Series B Convertible Preferred Stock shall
rank on liquidation senior to the Series A Convertible Preferred Stock.

     5.   Conversion.  The holders of shares of Series A Convertible Preferred
          ----------                                                          
Stock shall have the following conversion rights:

     5A.  Optional Conversion.  Subject to the terms and conditions of this
          -------------------                                              
paragraph 5, the holder of any share or shares of Series A Convertible Preferred
Stock shall have the right, at its option at any time, to convert any such
shares of Series A Convertible Preferred Stock (except that upon any liquidation
of the Corporation the right of conversion shall terminate at the close of
business on the business day fixed for payment of the amount distributable on
the Series A Convertible Preferred Stock) into such number of fully paid and
nonassessable shares of Class B Stock as is obtained by (i) multiplying the
number of shares of Series A Convertible Preferred Stock so to be converted by
$6.00 and (ii) dividing the result by the conversion price of $6.00 per share
or, in case an adjustment of such price has taken place pursuant to the further
provisions of this paragraph 5, then by the conversion price as last adjusted
and in effect at the date any share or shares of Series A Convertible Preferred
Stock are surrendered for conversion

                                       7
<PAGE>
 
(such price, or such price as last adjusted, being referred to as the "Series A
Conversion Price"). Such rights of conversion shall be exercised by the holder
thereof by giving written notice that the holder elects to convert a stated
number of shares of Series A Convertible Preferred Stock into Class B Stock and
by surrender of a certificate or certificates for the shares so to be converted
to the Corporation at its principal office (or such other of office or agency of
the Corporation as the Corporation may designate by notice in writing to the
holders of the Series A Convertible Preferred Stock) at any time during its
usual business hours on the date set forth in such notice, together with a
statement of the name or names (with address) in which the certificate or
certificates for shares of Class B Stock shall be issued.

     5B.  Issuance of Certificates: Time Conversion Effected.  Promptly after
          --------------------------------------------------                 
the receipt of the written notice referred to in subparagraph 5A and surrender
of the certificate or certificates for the share or shares of Series A
Convertible Preferred Stock to be converted, the Corporation shall issue and
deliver, or cause to be issued and delivered, to the holder, registered in such
name or names as such holder may direct, a certificate or certificates for the
number of whole shares of Class B Stock issuable upon the conversion of such
share or shares of Series A Convertible Preferred Stock. To the extent permitted
by law, such conversion shall be deemed to have been effected and the Series A
Conversion Price shall be determined as of the close of business on the date on
the date on which such written notice shall have been received by the
Corporation and the certificate or certificates for such share or shares shall
have been surrendered as aforesaid, and at such time the rights of the holder of
such share or shares of Series A Convertible Preferred Stock shall cease, and
the person or persons in whose name or names any certificate or certificates for
shares of Class B Stock shall be issuable upon such conversion shall be deemed
to have become the holder or holders of record of the shares represented
thereby.

     5C.  Fractional Shares: Dividends: Partial Conversion.  No fractional
          ------------------------------------------------                
shares shall be issued upon conversion of Series A Convertible Preferred Stock
into Class B Stock and no payment or adjustment shall be made upon any
conversion on account of any cash dividends on the Class B Stock issued upon
such conversion. At the time of each conversion, the Corporation shall pay in
cash an amount equal to all dividends, declared but unpaid on the shares of
Series A Convertible Preferred Stock surrendered for conversion to the date upon
which such conversion is deemed to take place as provided in subparagraph 5B. In
case the number of shares of Series A Convertible Preferred Stock represented by
the certificate or certificates surrendered pursuant to subparagraph 5A exceeds
the number of shares converted, the Corporation shall, upon such conversion,
execute and deliver to the holder, at the expense of the Corporation, a new
certificate or certificates for the number of shares of Series A Convertible
Preferred Stock represented by the certificate or certificates surrendered which
are not to be converted. If any fractional share of Class B Stock would, except
for the provisions of the first sentence of this subparagraph 5C, be delivered
upon such conversion, the Corporation, in lieu of delivering such fractional
share, shall pay to the holder surrendering the Series A Convertible Preferred
Stock for conversion an amount in cash equal to the current market price of such
fractional share as determined in good faith by the Board of Directors of the
Corporation.

     5D.  Adjustment of Price Upon Issuance of Common Stock.  Except as provided
          -------------------------------------------------                     
in subparagraph 5E, if and whenever the Corporation shall issue or sell, or is,
in accordance with subparagraphs 5D(1) through 5D(6), deemed to have issued or
sold, any shares of Common Stock for a consideration per share less than the
Conversion Price in effect immediately prior to the time of such issue or sale,
then, forthwith upon such issue or sale, the Series A Conversion Price

                                       8
<PAGE>
 
shall be reduced to the price determined by dividing (i) an amount equal to the
sum of (a) the number of shares of Common Stock outstanding immediately prior to
such issue or sale multiplied by the then existing Series A Conversion Price and
(b) the consideration, if any, received by the Corporation upon such issue or
sale, by (ii) the total number of shares of Common Stock outstanding immediately
after such issue or sale.

     For purposes of this subparagraph 5D, the following subparagraphs 5D(1) to
5D(6) shall also be applicable:

     5D(1)   Issuance of Rights or Options.  In case at any time the Corporation
             -----------------------------                                      
shall in any manner grant (whether directly or by assumption in a merger or
otherwise) any warrants or other rights to subscribe for or to purchase, or any
options for the purchase of, Common Stock or any stock or security convertible
into or exchangeable for Common Stock (such warrants, rights or options being
called "Options" and such convertible or exchangeable stock or securities being
called "Convertible Securities") whether or not such Options or the right to
convert or exchange any such Convertible Securities are immediately exercisable,
and the price per share for which Common Stock is issuable upon the exercise of
such Options or upon the conversion or exchange of such Convertible Securities
(determined by dividing (i) the total amount, if any, received or receivable by
the Corporation as consideration for the granting of such Options, plus the
minimum aggregate amount of additional consideration payable to the Corporation
upon the exercise of all such Options, plus, in the case of such Options which
relate to Convertible Securities, the minimum aggregate amount of additional
consideration, if any, payable upon the issue or sale of such Convertible
Securities and upon the conversion or exchange thereof, by (ii) the total
maximum number of shares of Common Stock issuable upon the exercise of such
Options or upon the conversion or exchange of all such Convertible Securities
issuable upon the exercise of such Options) shall be less than the Series A
Conversion Price in effect immediately prior to the time of the granting of such
Options, then the total maximum number of shares of Common Stock issuable upon
the exercise of such Options or upon conversion or exchange of the total maximum
amount of such Convertible Securities issuable upon the exercise of such Options
shall be deemed to have been issued for such price per share as of the date of
granting of such Options or the issuance of such Convertible Securities and
thereafter shall be deemed to be outstanding.  Except as otherwise provided in
subparagraph 5D(3), no adjustment of the Series A Conversion Price shall be made
upon the actual issue of such Common Stock or of such Convertible Securities
upon exercise of such Options or upon the actual issue of such Common Stock upon
conversion or exchange of such Convertible Securities.

     5D(2)   Issuance of Convertible Securities.  In case the Corporation shall
             ----------------------------------                                
in any manner issue (whether directly or by assumption in a merger or otherwise)
or sell any Convertible Securities, whether or not the rights to exchange or
convert any such Convertible Securities are immediately exercisable, and the
price per share for which Common Stock is issuable upon such conversion or
exchange (determined by dividing (i) the total amount received or receivable by
the Corporation as consideration for the issue or sale of such Convertible
Securities, plus the minimum aggregate amount of additional consideration, if
any, payable to the Corporation upon the conversion or exchange thereof, by (ii)
the total maximum number of shares of Common Stock issuable upon the conversion
or exchange of all such Convertible Securities) shall be less than the
Conversion Price in effect immediately prior to the time of such issue or sale,
then the total maximum number of shares of Common Stock issuable upon conversion
or exchange of all such Convertible Securities shall be deemed to have been
issued for such price per share as of

                                       9
<PAGE>
 
the date of the issue or sale of such Convertible Securities and thereafter
shall be deemed to be outstanding, provided that (a) except as otherwise
provided in subparagraph 5D(3), no adjustment of the Conversion Price shall be
made upon the actual issue of such Common Stock upon conversion or exchange of
such Convertible Securities and (b) if any such issue or sale of such
Convertible Securities is made upon exercise of any Options to purchase any such
Convertible Securities for which adjustments of the Conversion Price have been
or are to be made pursuant to other provisions of this subparagraph 5D, no
further adjustment of the Conversion Price shall be made by reason of such issue
or sale.

     5D(3)   Change in Option Price or Conversion Rate.  Upon the happening of
             -----------------------------------------                        
any of the following events, namely, if the purchase price provided for in any
Option referred to in subparagraph 5D(1), the additional consideration, if any,
payable upon the conversion or exchange of any Convertible Securities referred
to in subparagraph 5D(1) or 5D(2) or the rate at which Convertible Securities
referred to in subparagraph 5D(1) or 5D(2) are convertible into or exchangeable
for Common Stock shall change at any time (including, but not limited to,
changes under or by reason of provisions designed to protect against dilution),
the Series A Conversion Price in effect at the time of such event shall
forthwith be readjusted to the Series A Conversion Price which would have been
in effect at such time had such Options or Convertible Securities still
outstanding provided for such changed purchase price, additional consideration
or conversion rate, as the case may be, at the time initially granted, issued or
sold, but only if as a result of such adjustment the Series A Conversion Price
then in effect hereunder is thereby reduced; and on the termination of any such
Option or any such right to convert or exchange such Convertible Securities, the
Series A Conversion Price then in effect hereunder shall forthwith be increased
to the Series A Conversion Price which would have been in effect at the time of
such termination had such Option or Convertible Securities, to the extent
outstanding immediately prior to such termination, never been issued.

     5D(4)   Consideration for Stock.  In case any shares of Common Stock,
             -----------------------                                      
Options or Convertible Securities shall be issued or sold for cash, the
consideration received therefor shall be deemed to be the amount received by the
Corporation therefor, without deduction therefrom of any expenses incurred or
any underwriting commissions or concessions paid or allowed by the Corporation
in connection therewith. In case any shares of Common Stock, Options or
Convertible Securities shall be issued or sold for a consideration other than
cash, the amount of the consideration other than cash received by the
Corporation shall be deemed to be the fair value of such consideration as
determined in good faith by the Board of Directors of the Corporation, without
deduction of any expenses incurred or any underwriting commissions or
concessions paid or allowed by the Corporation in connection therewith. In case
any Options shall be issued in connection with the issue and sale of other
securities of the Corporation, together comprising one integral transaction in
which no specific consideration is allocated to such Options by the parties
thereto, such Options shall be deemed to have been issued for such consideration
as determined in good faith by the Board of Directors of the Corporation.

     5D(5)   Record Date.  In case the Corporation shall take a record of the
             -----------                                                     
holders of its Common Stock for the purpose of entitling them (i) to receive a
dividend or other distribution payable in Common Stock, Options or Convertible
Securities or (ii) to subscribe for or purchase Common Stock, Options or
Convertible Securities, then such record date shall be deemed to be the date of
the issue or sale of the shares of Common Stock deemed to have been issued or
sold

                                       10
<PAGE>
 
upon the declaration of such dividend or the making of such other distribution
or the date of the granting of such right of subscription or purchase, as the
case may be.

     5D(6)   Treasury Shares.  The number of shares of Common Stock outstanding
             ---------------                                                   
at any given time shall not include shares owned or held by or for the account
of the Corporation, and the disposition of any such shares shall be considered
an issue or sale of Common Stock for the purpose of this subparagraph 5D.

     5E.  Certain Issues of Common Stock Excepted.  Anything herein to the
          ---------------------------------------                         
contrary notwithstanding, the Corporation shall not be required to make any
adjustment of the Series A Conversion Price in the case of the issuance from and
after the date of filing of these terms of the Series A Convertible Preferred
Stock of shares of Class B Stock issued upon the conversion of (a) shares of
Series A Convertible Preferred Stock, (b) shares of Series B Convertible
Preferred Stock, or (c) shares of Class A Stock.

     5F.  Subdivision or Combination of Common Stock.  In case the Corporation
          ------------------------------------------                          
shall at any time subdivide (by any stock split, stock dividend or otherwise)
its outstanding shares of Common Stock into a greater number of shares, the
Series A Conversion Price in effect immediately prior to such subdivision shall
be proportionately reduced, and, conversely, in case the outstanding shares of
Common Stock shall be combined into a smaller number of shares, the Series A
Conversion Price in effect immediately prior to such combination shall be
proportionately increased.

     5G.  Reorganization or Reclassification.  If any capital reorganization or
          ----------------------------------                                   
reclassification of the capital stock of the Corporation shall be effected in
such a way that holders of Class B Stock shall be entitled to receive stock,
securities or assets with respect to or in exchange for Class B Stock, then, as
a condition of such reorganization or reclassification, lawful and adequate
provisions shall be made whereby each holder of a share or shares of Series A
Convertible Preferred Stock shall thereupon have the right to receive, upon the
basis and upon the terms and conditions specified herein and in lieu of the
shares of Class B Stock immediately theretofore receivable upon the conversion
of such share or shares of Series A Convertible Preferred Stock, such shares of
stock, securities or assets as may be issued or payable with respect to or in
exchange for a number of outstanding shares of such Class B Stock equal to the
number of shares of such Class B Stock immediately theretofore receivable upon
such conversion had such reorganization or reclassification not taken place, and
in any such case appropriate provisions shall be made with respect to the rights
and interests of such holder to the end that the provisions hereof (including
without limitation provisions for adjustments of the Series A Conversion Price)
shall thereafter be applicable, as nearly as may be, in relation to any shares
of stock, securities or assets thereafter deliverable upon the exercise of such
conversion rights.

     5H.  Notice of Adjustment.  Upon any adjustment of the Series A Conversion
          --------------------                                                 
Price, then and in each such case the Corporation shall give written notice
thereof, by delivery in person, certified or registered mail, return receipt
requested, telecopier or telex, addressed to each holder of shares of Series A
Convertible Preferred Stock at the address of such holder as shown on the books
of the Corporation, which notice shall state the Series A Conversion Price
resulting from such adjustment, setting forth in reasonable detail the method
upon which such calculation is based.

                                       11
<PAGE>
 
     5I.  Other Notices.  In case at any time:
          -------------                       

     (1)  the Corporation shall declare any dividend upon its Common Stock
payable in cash or stock or make any other distribution to the holders of its
Common Stock;

     (2)  the Corporation shall offer for subscription pro rata to the holders
of its Common Stock any additional shares of stock of any class or other rights;

     (3)  there shall be any capital reorganization or reclassification of the
capital stock of the Corporation, or a consolidation or merger of the
Corporation with or into another entity or entities, or a sale, lease,
abandonment, transfer or other disposition of all or substantially all its
assets; or

     (4)  there shall be a voluntary or involuntary dissolution, liquidation or
winding up of the Corporation;

then, in any one or more of said cases, the Corporation shall give, by delivery
in person, certified or registered mail, return receipt requested, telecopier or
telex, addressed to each holder of any shares of Series A Convertible Preferred
Stock at the address of such holder as shown on the books of the Corporation,
(a) at least 20 days' prior written notice of the date on which the books of the
Corporation shall close or a record shall be taken for such dividend,
distribution or subscription rights or for determining rights to vote in respect
of any such reorganization, reclassification, consolidation, merger,
disposition, dissolution, liquidation or winding up and (b) in the case of any
such reorganization, reclassification, consolidation, merger, disposition,
dissolution, liquidation or winding up, at least 20 days' prior written notice
of the date when the same shall take place. Such notice in accordance with the
foregoing clause (a) shall also specify, in the case of any such dividend,
distribution or subscription rights, the date on which the holders of Common
Stock shall be entitled thereto and such notice in accordance with the foregoing
clause (b) shall also specify the date on which the holders of Common Stock
shall be entitled to exchange their Common Stock for securities or other
property deliverable upon such reorganization, reclassification, consolidation,
merger, disposition, dissolution, liquidation or winding up, as the case may be.

     5J.  Stock to be Reserved. The Corporation will at all times reserve and
          --------------------                                               
keep available out of its authorized Class B Stock, solely for the purpose of
issuance upon the conversion of Series A Convertible Preferred Stock as herein
provided, such number of shares of Class B Stock as shall then be issuable upon
the conversion of all outstanding shares of Series A Convertible Preferred
Stock. The Corporation covenants that all shares of Class B Stock which shall be
so issued shall be duly and validly issued and fully paid and nonassessable and
free from all taxes, liens and charges with respect to the issue thereof, and,
without limiting the generality of the foregoing, the Corporation covenants that
it will from time to time take all such action as may be requisite to assure
that the par value per share of the Common Stock is at all times equal to or
less than the Series A Conversion Price in effect at the time. The Corporation
will take all such action as may be necessary to assure that all such shares of
Common Stock may be so issued without violation of any applicable law or
regulation, or of any requirement of any national securities exchange upon which
the Common Stock may be listed. The Corporation will not take any action which
results in any adjustment of the Series A Conversion Price if the total number
of shares of Class B Stock issued and issuable after such action upon conversion
of the Series 

                                       12
<PAGE>
 
A Convertible Preferred Stock would exceed the total number of shares of
Class B Stock then authorized by the Certificate of Incorporation.

     5K.  No Reissuance of Series A Convertible Preferred Stock. Shares of
          -----------------------------------------------------           
Series A Convertible Preferred Stock which are converted into shares of Class B
Stock as provided herein shall not be reissued.

     5L.  Issue Tax. The issuance of certificates for shares of Class B Stock
          ---------                                                          
upon conversion of Series A Convertible Preferred Stock shall be made without
charge to the holders thereof for any issuance tax in respect thereof, provided
that the Corporation shall not be required to pay any tax which may be payable
in respect of any transfer involved in the issuance and delivery of any
certificate in a name other than that of the holder of the Series A Convertible
Preferred Stock which is being converted.

     5M.  Closing of Books. The Corporation will at no time close its transfer
          ----------------                                                    
books against the transfer of any Series A Convertible Preferred Stock or of any
shares of Class B Stock issued or issuable upon the conversion of any shares of
Series A Convertible Preferred Stock in any manner which interferes with the
timely conversion of such Series A Convertible Preferred Stock, except as may
otherwise be required to comply with applicable securities laws.

     5N.  Definition of Common Stock. As used in this paragraph 5, the term
          --------------------------                                       
"Common Stock" shall mean and include the Corporation's authorized Class A
Common Stock, par value $.01 per share, and the Corporation's authorized Class B
Common Stock, par value $.01 per share, as constituted on the date of filing of
these terms of the Series A Convertible Preferred Stock, and shall also include
any capital stock of any class of the Corporation thereafter authorized which
shall not be limited to a fixed sum or percentage in respect of the rights of
the holders thereof to participate in dividends or in the distribution of assets
upon the voluntary or involuntary liquidation, dissolution or winding up of the
Corporation; provided that the shares of Class B Stock receivable upon
conversion of shares of Series A Convertible Preferred Stock shall include only
shares designated as Class B Stock of the Corporation on the date of filing of
this instrument, or in case of any reorganization or reclassification of the
outstanding shares thereof, the stock, securities or assets provided for in
subparagraph 5G of this Section II.

     5O.  Mandatory Conversion. If at any time the Corporation shall effect a
          --------------------                                               
firm commitment underwritten public offering of shares of Common Stock in which
(i) the aggregate net proceeds to the Corporation after deducting underwriters
commissions and discounts shall be at least $10,000,000 and (ii) the price paid
by the public for such shares shall be at least $100 per share (appropriately
adjusted to reflect the occurrence of any event described in subparagraph 5F),
then effective upon the closing of the sale of such shares by the Corporation
pursuant to such public offering, all outstanding shares of Series A Convertible
Preferred Stock shall automatically convert to shares of Class B Stock on the
basis set forth in this paragraph 5. Holders of shares of Series A Convertible
Preferred Stock so converted may deliver to the Corporation at its principal
office (or such other office or agency of the Corporation as the Corporation may
designate by notice in writing to such holders) during its usual business hours,
the certificate or certificates for the shares so converted. As promptly as
practicable thereafter, the Corporation shall issue and deliver to such holder a
certificate or certificates for the number of whole shares of Class B Stock to
which such holder is entitled, together with any cash dividends and payment in
lieu of fractional shares to which such holder may be entitled pursuant to
subparagraph 5C. 

                                       13
<PAGE>
 
Until such time as a holder of shares of Series A Convertible Preferred Stock
shall surrender his or its certificates therefor as provided above, such
certificates shall be deemed to represent the shares of Class B Stock to which
such holder shall be entitled upon the surrender thereof.

     6A.  Mandatory Redemption.  Subject to the senior rights of the holders of
          --------------------                                                 
Series B Convertible Preferred Stock, on or after December 31, 2001, the
Corporation shall redeem from each holder of shares of Series A Convertible
Preferred Stock, at such holder's option, all of the shares of Series A
Convertible Preferred Stock held by such holder on the Series A Redemption Date
(as defined below).

     6B.  Redemption Price and Payment. The Series A Convertible Preferred Stock
          ----------------------------                                          
to be redeemed on the Redemption Date shall be redeemed by paying for each share
in cash an amount equal to $6.00 per share plus, in the case of each share, an
amount equal to all dividends declared but unpaid thereon, computed to the
Series A Redemption Date, such amount being referred to as the "Series A
Redemption Price". Such payment shall be made in full on the Series A Redemption
Date to the holders entitled thereto.

     6C.  Redemption Mechanics. Any holder of Series A Convertible Preferred
          --------------------                                              
Stock desiring to exercise its option under Paragraph 6A shall provide written
notice (the "Series A Redemption Notice") to the Corporation indicating (a) the
number of Series A Convertible Preferred Shares held by such holder and (b) the
date on which such redemption shall take place (the "Series A Redemption Date"),
which Series A Redemption Date shall not be less than 45 days from the date the
Series A Redemption Notice is delivered to the Corporation by delivery in
person, certified or registered mail, return receipt requested, telecopier or
telex. Within five (5) days of receipt of any Series A Redemption Notice, the
Corporation shall send written notice to all other holders of record of Shares
of Series A Convertible Preferred Stock of the receipt (and the contents of)
such Series A Redemption Notice. Any such holder may, by delivery of a Series A
Redemption Notice within thirty (30) days of receipt of such notice from the
Corporation, elect to have all of its shares of Series A Convertible Preferred
Stock redeemed on the Series A Redemption Date indicated in the Series A
Redemption Notice previously received by the Corporation. The Series A
Redemption Price shall be payable to each holder at it or his address as shown
by the records of the Corporation. From and after the close of business on the
Series A Redemption Date, unless there shall have been a default in the payment
of the Series A Redemption Price, all rights of holders of shares of Series A
Convertible Preferred Stock requesting redemption (except the right to receive
the Series A Redemption Price) shall cease with respect to such shares, and such
shares shall not thereafter be transferred on the books of the Corporation or be
deemed to be outstanding for any purpose whatsoever. If the funds of the
Corporation legally available for redemption of shares of Series A Convertible
Preferred Stock on any Series A Redemption Date are insufficient to redeem the
total number of outstanding shares of Series A Convertible Preferred Stock, the
holders of shares of Series A Convertible Preferred Stock for which the
Corporation has received a Series A Redemption Notice shall share ratably in any
funds legally available for redemption of such shares according to the
respective amounts which would be payable with respect to the full number of
shares owned by them if all such outstanding shares were redeemed in full. The
shares of Series A Convertible Preferred Stock not redeemed shall remain
outstanding and entitled to all rights and preferences provided herein. At any
time thereafter when additional funds of the Corporation are legally available
for the redemption of such shares of Series A Convertible Preferred Stock, such
funds will be used,

                                       14
<PAGE>
 
at the end of the next succeeding fiscal quarter, to redeem the balance of such
shares, or such portion thereof for which funds are then legally available, on
the basis set forth above.

     6D.  Redeemed or Otherwise Acquired Shares to be Retired. Any shares of
          ---------------------------------------------------               
Series A Convertible Preferred Stock redeemed pursuant to this paragraph 6 or
otherwise acquired by the Corporation in any manner whatsoever shall be canceled
and shall not under any circumstances be reissued; and the Corporation may from
time to time take such appropriate corporate action as may be necessary to
reduce accordingly the number of authorized shares of Series A Convertible
Preferred Stock.

III. SERIES B CONVERTIBLE PREFERRED STOCK
     ------------------------------------

     1.   Number of Shares. There shall be a series of Preferred Stock
          ----------------                                            
designated and known as "Series B Convertible Preferred Stock" which shall
consist of 1,000,000 shares.

     2.   Voting.  Except as may be otherwise provided herein or by law, the
          ------                                                            
Series B Convertible Preferred Stock shall vote together with all other classes
and series of stock of the Corporation as a single class on all actions to be
taken by the stockholders of the Corporation. Each share of Series B Convertible
Preferred Stock shall entitle the holder thereof to such number of votes per
share on each such action as shall equal the number of shares of Class B Stock
(including fractions of a share) into which each share of Series B Convertible
Preferred Stock is then convertible.

     3.   Dividends. The holders of the Series B Convertible Preferred Stock
          ---------                                                         
shall be entitled to receive, out of funds legally available therefore, and the
Company shall declare and pay dividends on the Series B Convertible Preferred
Stock at the same rate as dividends (other than dividends payable in additional
shares of Common Stock) are declared and paid with respect to the Common Stock
(treating each share of Series B Convertible Preferred Stock as being equal to
the number of shares of Common Stock (including fractions of a share) into which
each share of Series B Convertible Preferred Stock is then convertible).

     4.   Liquidation. Upon any liquidation, dissolution or winding up of the
          -----------                                                        
Corporation, whether voluntary or involuntary, the holders of the shares of
Series B Convertible Preferred Stock shall be entitled, before any distribution
or payment is made upon any stock ranking on liquidation junior to the Series B
Convertible Preferred Stock, to be paid an amount equal to the greater of 
(i) $12.00 per share plus, in the case of each share, an amount equal to all
dividends declared but unpaid thereon, computed to the date payment thereof is
made available, or (ii) such amount per share as would have been payable had
each such share been converted to Common Stock pursuant to paragraph 5 of this
Section III immediately prior to such liquidation, dissolution or winding up,
and the holders of Series B Convertible Preferred Stock shall not be entitled to
any further payment, such amount payable with respect to one share of Series B
Convertible Preferred Stock being sometimes referred to as the "Series B
Liquidation Payment" and with respect to all shares of Series B Convertible
Preferred Stock being sometimes referred to as the "Series B Liquidation
Payments". If upon such liquidation, dissolution or winding up of the
Corporation, whether voluntary or involuntary, the assets to be distributed
among the holders of Series B Convertible Preferred Stock shall be insufficient
to permit payment to the holders of Series B Convertible Preferred Stock of the
amount distributable as aforesaid, then the entire assets of the Corporation to
be so distributed shall be distributed ratably among the holders of

                                       15
<PAGE>
 
Series B Convertible Preferred Stock. Upon any such liquidation, dissolution or
winding up of the Corporation, after the holders of Series A Convertible
Preferred Stock shall have been paid in full the amounts to which they shall be
entitled, the remaining net assets of the Corporation may be distributed to the
holders of stock ranking on liquidation junior to the Series B Convertible
Preferred Stock. Written notice of such liquidation, dissolution or winding up,
stating a payment date, the amount of the Series B Liquidation Payments and the
place where said Series B Liquidation Payments shall be payable, shall be
delivered in person, mailed by certified or registered mail, return receipt
requested, or sent by telecopier or telex, not less than 20 days prior to the
payment date stated therein, to the holders of record of Series B Convertible
Preferred Stock, such notice to be addressed to each such holder at its address
as shown by the records of the Corporation. The consolidation or merger of the
Corporation into or with any other entity or entities which results in the
exchange of outstanding shares of the Corporation for securities or other
consideration issued or paid or caused to be issued or paid by any such entity
or affiliate thereof (other than a merger to reincorporate the Corporation in a
different jurisdiction), and the sale, lease, abandonment, transfer or other
disposition by the Corporation of all or substantially all its assets, shall be
deemed to be a liquidation, dissolution or winding of the Corporation within the
meaning of the provisions of this paragraph 4. For purposes hereof, the Common
Stock and Series A Convertible Preferred Stock shall rank on liquidation junior
to the Series B Convertible Preferred Stock.

     5.   Conversion.  The holders of shares of Series B Convertible Preferred
          ----------                                                          
Stock shall have the following conversion rights:

     5A.  Optional Conversion.   Subject to the terms and conditions of this
          -------------------                                               
paragraph 5, the holder of any share or shares of Series B Convertible Preferred
Stock shall have the right, at its option at any time, to convert any such
shares of Series B Convertible Preferred Stock (except that upon any liquidation
of the Corporation the right of conversion shall terminate at the close of
business on the business day fixed for payment of the amount distributable on
the Series B Convertible Preferred Stock) into such number of fully paid and
nonassessable shares of Class B Stock as is obtained by (i) multiplying the
number of shares of Series B Convertible Preferred Stock so to be converted by
$12.00 and (ii) dividing the result by the conversion price of $12.00 per share
or, in case an adjustment of such price has taken place pursuant to the further
provisions of this paragraph 5, then by the conversion price as last adjusted
and in effect at the date any share or shares of Series B Convertible Preferred
Stock are surrendered for conversion (such price, or such price as last
adjusted, being referred to as the "Series B Conversion Price"). Such rights of
conversion shall be exercised by the holder thereof by giving written notice
that the holder elects to convert a stated number of shares of Series B
Convertible Preferred Stock into Class B Stock and by surrender of a certificate
or certificates for the shares so to be converted to the Corporation at its
principal office (or such other of office or agency of the Corporation as the
Corporation may designate by notice in writing to the holders of the Series B
Convertible Preferred Stock) at any time during its usual business hours on the
date set forth in such notice, together with a statement of the name or names
(with address) in which the certificate or certificates for shares of Class B
Stock shall be issued.

     5B.  Issuance of Certificates: Time Conversion Effected.  Promptly after
          --------------------------------------------------                 
the receipt of the written notice referred to in subparagraph 5A and surrender
of the certificate or certificates for the share or shares of Series B
Convertible Preferred Stock to be converted, the Corporation shall issue and
deliver, or cause to be issued and delivered, to the holder, registered in such
name

                                       16
<PAGE>
 
or names as such holder may direct, a certificate or certificates for the number
of whole shares of Class B Stock issuable upon the conversion of such share or
shares of Series B Convertible Preferred Stock. To the extent permitted by law,
such conversion shall be deemed to have been effected and the Series B
Conversion Price shall be determined as of the close of business on the date on
the date on which such written notice shall have been received by the
Corporation and the certificate or certificates for such share or shares shall
have been surrendered as aforesaid, and at such time the rights of the holder of
such share or shares of Series B Convertible Preferred Stock shall cease, and
the person or persons in whose name or names any certificate or certificates for
shares of Class B Stock shall be issuable upon such conversion shall be deemed
to have become the holder or holders of record of the shares represented
thereby.

     5C.  Fractional Shares: Dividends: Partial Conversion. No fractional shares
          ------------------------------------------------                      
shall be issued upon conversion of Series B Convertible Preferred Stock into
Class B Stock and no payment or adjustment shall be made upon any conversion on
account of any cash dividends on the Class B Stock issued upon such conversion.
At the time of each conversion, the Corporation shall pay in cash an amount
equal to all dividends, declared but unpaid on the shares of Series B
Convertible Preferred Stock surrendered for conversion to the date upon which
such conversion is deemed to take place as provided in subparagraph 5B. In case
the number of shares of Series B Convertible Preferred Stock represented by the
certificate or certificates surrendered pursuant to subparagraph 5A exceeds the
number of shares converted, the Corporation shall, upon such conversion, execute
and deliver to the holder, at the expense of the Corporation, a new certificate
or certificates for the number of shares of Series B Convertible Preferred Stock
represented by the certificate or certificates surrendered which are not to be
converted. If any fractional share of Class B Stock would, except for the
provisions of the first sentence of this subparagraph 5C, be delivered upon such
conversion, the Corporation, in lieu of delivering such fractional share, shall
pay to the holder surrendering the Series B Convertible Preferred Stock for
conversion an amount in cash equal to the current market price of such
fractional share as determined in good faith by the Board of Directors of the
Corporation.

     5D.  Subdivision or Combination of Common Stock.  In case the Corporation
          ------------------------------------------                          
shall at any time subdivide (by any stock split, stock dividend or otherwise)
its outstanding shares of Common Stock into a greater number of shares, the
Series B Conversion Price in effect immediately prior to such subdivision shall
be proportionately reduced, and, conversely, in case the outstanding shares of
Common Stock shall be combined into a smaller number of shares, the Series B
Conversion Price in effect immediately prior to such combination shall be
proportionately increased.

     5E.  Reorganization or Reclassification.   If any capital reorganization or
          ----------------------------------                                    
reclassification of the capital stock of the Corporation shall be effected in
such a way that holders of Class B Stock shall be entitled to receive stock,
securities or assets with respect to or in exchange for Class B Stock, then, as
a condition of such reorganization or reclassification, lawful and adequate
provisions shall be made whereby each holder of a share or shares of Series B
Convertible Preferred Stock shall thereupon have the right to receive, upon the
basis and upon the terms and conditions specified herein and in lieu of the
shares of Class B Stock immediately theretofore receivable upon the conversion
of such share or shares of Series B Convertible Preferred Stock, such shares of
stock, securities or assets as may be issued or payable with respect to or in
exchange for a number of outstanding shares of such Class B Stock equal to the
number of shares of such Class B Stock immediately theretofore receivable upon
such conversion had such

                                       17
<PAGE>
 
reorganization or reclassification not taken place, and in any such case
appropriate provisions shall be made with respect to the rights and interests of
such holder to the end that the provisions hereof (including without limitation
provisions for adjustments of the Series B Conversion Price) shall thereafter be
applicable, as nearly as may be, in relation to any shares of stock, securities
or assets thereafter deliverable upon the exercise of such conversion rights.

     5F.  Notice of Adjustment. Upon any adjustment of the Series B Conversion
          --------------------                                                
Price pursuant to subparagraph 5D of this Section III, then and in each such
case the Corporation shall give written notice thereof, by delivery in person,
certified or registered mail, return receipt requested, telecopier or telex,
addressed to each holder of shares of Series B Convertible Preferred Stock at
the address of such holder as shown on the books of the Corporation, which
notice shall state the Series B Conversion Price resulting from such adjustment,
setting forth in reasonable detail the method upon which such calculation is
based.

     5G.  Other Notices. In case at any time:
          -------------                      

     (1)  the Corporation shall declare any dividend upon its Common Stock
payable in cash or stock or make any other distribution to the holders of its
Common Stock;

     (2)  the Corporation shall offer for subscription pro rata to the holders
of its Common Stock any additional shares of stock of any class or other rights;

     (3)  there shall be any capital reorganization or reclassification of the
capital stock of the Corporation, or a consolidation or merger of the
Corporation with or into another entity or entities, or a sale, lease,
abandonment, transfer or other disposition of all or substantially all its
assets; or

     (4)  there shall be a voluntary or involuntary dissolution, liquidation or
winding up of the Corporation;

then, in any one or more of said cases, the Corporation shall give, by delivery
in person, certified or registered mail, return receipt requested, telecopier or
telex, addressed to each holder of any shares of Series B Convertible Preferred
Stock at the address of such holder as shown on the books of the Corporation,
(a) at least 20 days' prior written notice of the date on which the books of the
Corporation shall close or a record shall be taken for such dividend,
distribution or subscription rights or for determining rights to vote in respect
of any such reorganization, reclassification, consolidation, merger,
disposition, dissolution, liquidation or winding up and (b) in the case of any
such reorganization, reclassification, consolidation, merger, disposition,
dissolution, liquidation or winding up, at least 20 days' prior written notice
of the date when the same shall take place. Such notice in accordance with the
foregoing clause (a) shall also specify, in the case of any such dividend,
distribution or subscription rights, the date on which the holders of Common
Stock shall be entitled thereto and such notice in accordance with the foregoing
clause (b) shall also specify the date on which the holders of Common Stock
shall be entitled to exchange their Common Stock for securities or other
property deliverable upon such reorganization, reclassification, consolidation,
merger, disposition, dissolution, liquidation or winding up, as the case may be.

                                       18
<PAGE>
 
     5H.  Stock to be Reserved. The Corporation will at all times reserve and
          --------------------                                               
keep available out of its authorized Class B Stock, solely for the purpose of
issuance upon the conversion of Series B Convertible Preferred Stock as herein
provided, such number of shares of Class B Stock as shall then be issuable upon
the conversion of all outstanding shares of Series B Convertible Preferred
Stock. The Corporation covenants that all shares of Class B Stock which shall be
so issued shall be duly and validly issued and fully paid and nonassessable and
free from all taxes, liens and charges with respect to the issue thereof, and,
without limiting the generality of the foregoing, the Corporation covenants that
it will from time to time take all such action as may be requisite to assure
that the par value per share of the Common Stock is at all times equal to or
less than the Series B Conversion Price in effect at the time. The Corporation
will take all such action as may be necessary to assure that all such shares of
Common Stock may be so issued without violation of any applicable law or
regulation, or of any requirement of any national securities exchange upon which
the Common Stock may be listed. The Corporation will not take any action which
results in any adjustment of the Series B Conversion Price if the total number
of shares of Class B Stock issued and issuable after such action upon conversion
of the Series B Convertible Preferred Stock would exceed the total number of
shares of Class B Stock then authorized by the Certificate of Incorporation.

     5I.  No Reissuance of Series B Convertible Preferred Stock. Shares of
          -----------------------------------------------------           
Series B Convertible Preferred Stock which are converted into shares of Class B
Stock as provided herein shall not be reissued.

     5J.  Issue Tax. The issuance of certificates for shares of Class B Stock
          ---------                                                          
upon conversion of Series B Convertible Preferred Stock shall be made without
charge to the holders thereof for any issuance tax in respect thereof, provided
that the Corporation shall not be required to pay any tax which may be payable
in respect of any transfer involved in the issuance and delivery of any
certificate in a name other than that of the holder of the Series B Convertible
Preferred Stock which is being converted.

     5K.  Closing of Books. The Corporation will at no time close its transfer
          ----------------                                                    
books against the transfer of any Series B Convertible Preferred Stock or of any
shares of Class B Stock issued or issuable upon the conversion of any shares of
Series B Convertible Preferred Stock in any manner which interferes with the
timely conversion of such Series B Convertible Preferred Stock, except as may
otherwise be required to comply with applicable securities laws.

     5L.  Definition of Common Stock. As used in this paragraph 5 of Section
          --------------------------                                        
III, the term "Common Stock" shall mean and include the Corporation's authorized
Class A Common Stock, par value $.01 per share, and the Corporation's authorized
Class B Common Stock, par value $.01 per share, as constituted on the date of
filing of these terms of the Series B Convertible Preferred Stock, and shall
also include any capital stock of any class of the Corporation thereafter
authorized which shall not be limited to a fixed sum or percentage in respect of
the rights of the holders thereof to participate in dividends or in the
distribution of assets upon the voluntary or involuntary liquidation,
dissolution or winding up of the Corporation; provided that the shares of Class
B Stock receivable upon conversion of shares of Series B Convertible Preferred
Stock shall include only shares designated as Class B Stock of the Corporation
on the date of filing of this instrument, or in case of any reorganization or
reclassification of the outstanding shares thereof, the stock, securities or
assets provided for in subparagraph 5G of this Section III.

                                       19
<PAGE>
 
     5M.  Mandatory Conversion. If at any time the Corporation shall effect a
          --------------------                                               
firm commitment underwritten public offering of shares of Common Stock in which
(i) the aggregate net proceeds to the Corporation after deducting underwriters
commissions and discounts shall be at least $10,000,000 and (ii) the price paid
by the public for such shares shall be at least $100 per share (appropriately
adjusted to reflect the occurrence of any event described in subparagraph 5F),
then effective upon the closing of the sale of such shares by the Corporation
pursuant to such public offering, all outstanding shares of Series B Convertible
Preferred Stock shall automatically convert to shares of Class B Stock on the
basis set forth in this paragraph 5. Holders of shares of Series B Convertible
Preferred Stock so converted may deliver to the Corporation at its principal
office (or such other office or agency of the Corporation as the Corporation may
designate by notice in writing to such holders) during its usual business hours,
the certificate or certificates for the shares so converted. As promptly as
practicable thereafter, the Corporation shall issue and deliver to such holder a
certificate or certificates for the number of whole shares of Class B Stock to
which such holder is entitled, together with any cash dividends and payment in
lieu of fractional shares to which such holder may be entitled pursuant to
subparagraph 5C. Until such time as a holder of shares of Series B Convertible
Preferred Stock shall surrender his or its certificates therefor as provided
above, such certificates shall be deemed to represent the shares of Class B
Stock to which such holder shall be entitled upon the surrender thereof.

     6A.  Mandatory Redemption. On or after December 31, 2001, the Corporation
          --------------------                                                
shall redeem from each holder of shares of Series B Convertible Preferred Stock,
at such holder's option, all of the shares of Series B Convertible Preferred
Stock held by such holder on the Series B Redemption Date (as defined below).

     6B.  Redemption Price and Payment. The Series B Convertible Preferred Stock
          ----------------------------                                          
to be redeemed on the Series B Redemption Date shall be redeemed by paying for
each share in cash an amount equal to $12.00 per share plus, in the case of each
share, an amount equal to all dividends declared but unpaid thereon, computed to
the Series B Redemption Date, such amount being referred to as the "Series B
Redemption Price". Such payment shall be made in full on the Series B Redemption
Date to the holders entitled thereto.

     6C.  Redemption Mechanics. Any holder of Series B Convertible Preferred
          --------------------                                              
Stock desiring to exercise its option under Paragraph 6A shall provide written
notice (the "Series B Redemption Notice") to the Corporation indicating (a) the
number of Series B Convertible Preferred Shares held by such holder and (b) the
date on which such redemption shall take place (the "Series B Redemption Date"),
which Series B Redemption Date shall not be less than 45 days from the date the
Series B Redemption Notice is delivered to the Corporation by delivery in
person, certified or registered mail, return receipt requested, telecopier or
telex. Within five (5) days of receipt of any Redemption Notice, the Corporation
shall send written notice to all other holders of record of Shares of Series B
Convertible Preferred Stock of the receipt (and the contents of) such Redemption
Notice. Any such holder may, by delivery of a Series B Redemption Notice within
thirty (30) days of receipt of such notice from the Corporation, elect to have
all of its shares of Series B Convertible Preferred Stock redeemed on the Series
B Redemption Date indicated in the Series B Redemption Notice previously
received by the Corporation. The Redemption Price shall be payable to each
holder at it or his address as shown by the records of the Corporation. From and
after the close of business on the Series B Redemption Date, unless there shall
have been a default in the payment of the Series B Redemption Price, all rights
of holders of shares of Series B Convertible Preferred Stock

                                       20
<PAGE>
 
requesting redemption (except the right to receive the Series B Redemption
Price) shall cease with respect to such shares, and such shares shall not
thereafter be transferred on the books of the Corporation or be deemed to be
outstanding for any purpose whatsoever. If the funds of the Corporation legally
available for redemption of shares of Series B Convertible Preferred Stock on
any Series B Redemption Date are insufficient to redeem the total number of
outstanding shares of Series B Convertible Preferred Stock, the holders of
shares of Series B Convertible Preferred Stock for which the Corporation has
received a Series B Redemption Notice shall share ratably in any funds legally
available for redemption of such shares according to the respective amounts
which would be payable with respect to the full number of shares owned by them
if all such outstanding shares were redeemed in full. The shares of Series B
Convertible Preferred Stock not redeemed shall remain outstanding and entitled
to all rights and preferences provided herein. At any time thereafter when
additional funds of the Corporation are legally available for the redemption of
such shares of Series B Convertible Preferred Stock, such funds will be used, at
the end of the next succeeding fiscal quarter, to redeem the balance of such
shares, or such portion thereof for which funds are then legally available, on
the basis set forth above.

     6D.  Redeemed or Otherwise Acquired Shares to be Retired. Any shares of
          ---------------------------------------------------               
Series B Convertible Preferred Stock redeemed pursuant to this paragraph 6 or
otherwise acquired by the Corporation in any manner whatsoever shall be canceled
and shall not under any circumstances be reissued; and the Corporation may from
time to time take such appropriate corporate action as may be necessary to
reduce accordingly the number of authorized shares of Series B Convertible
Preferred Stock.

     6E.  Priority of Redemption.  The Series B Convertible Preferred Stock has
          ----------------------                                               
priority over the Series A Convertible Preferred Stock with respect to the
rights of redemption set forth in this paragraph 6.  In the event the
Corporation has insufficient funds to redeem all of the Series B Convertible
Preferred Stock at the then applicable Series B Redemption Price, the
Corporation shall not be permitted to redeem, and the holders of Series A
Convertible Preferred Stock shall not be entitled to demand redemption of, any
shares of Series A Convertible Preferred Stock until such time as the
Corporation has redeemed all of the issued and outstanding Series B Convertible
Preferred Stock as provided for herein.

     7.   Restrictions and Limitations.
          ---------------------------- 

     (a)  Corporate Actions: Amendments to Charter. The Corporation will not
          ----------------------------------------                          
amend its Certificate of Incorporation or take any other corporate action
without the approval by the holders of at least 66.67% of the then outstanding
shares of Series A Convertible Preferred Stock and Series B Convertible
Preferred Stock, voting or consenting together (separately from any other class
or series of capital stock of the Corporation), if such amendment or corporate
action would:

          (i)    adversely affect or significantly alter the rights (including
but not limited to rights to a liquidation preference, dividend rights, voting
rights, Board representation rights and conversion rights) of the holders of the
Series A Convertible Preferred Stock and Series B Convertible Preferred Stock;
provided, however, that if such amendment or action would adversely affect or
significantly alter such rights of only one of such series of Preferred Stock,
then the holders of such series shall be entitled to approve as aforesaid such
amendment or action, voting or consenting separately as a series;

                                       21
<PAGE>
 
          (ii)   create, authorize the creation of or obligate the Corporation
to authorize the creation of additional shares of Class A Stock or capital stock
senior to or on a parity with the Series A Convertible Preferred Stock or Series
B Convertible Preferred Stock (or securities convertible into such shares), or
increase the authorized amount of Series A Convertible Preferred Stock (or
securities convertible into shares of Series A Convertible Preferred Stock) or
Series B Convertible Preferred Stock (or securities convertible into shares of
Series B Convertible Preferred Stock); or

          (iii)  issue or grant any shares of Common Stock or of warrants,
options or other rights to purchase or acquire Common Stock except for the
issuance of shares of Common Stock upon the conversion of shares of Series A
Convertible Preferred Stock pursuant to the terms hereof, and the issuance of
Series A Convertible Preferred Stock upon conversion of the Convertible Notes,
and the issuance of shares of Common Stock upon conversion of shares of Series B
Convertible Preferred Stock pursuant to the terms hereof.

     (b)  Additional Limitations.  For so long as 25% of the aggregate number of
          ----------------------                                                
shares of Series A Convertible Preferred Stock and Series B Convertible
Preferred Stock initially issued remain outstanding, the Corporation will not,
without the approval of the holders of at least 66.67% of the then outstanding
shares of Series A Convertible Preferred Stock and Series B Convertible
Preferred Stock:

          (i)    Issue any debt securities which are convertible into,
exchangeable for or otherwise entitle the holder to receive equity securities of
the Corporation, other than securities which are issued in connection with
borrowing by the Corporation from banks or other institutional lenders except
for an aggregate of up to $10,000,000 in principal amount of Convertible Secured
Subordinated Notes issued to the original holders of Series A Convertible
Preferred Stock;

          (ii)   redeem, purchase or otherwise acquire for value (or pay into or
set aside a sinking fund for such purpose) any shares of Common Stock; or

          (iii)  merge or consolidate with any other corporation, if at least a
majority of the voting power of the Corporation, or the surviving corporation
after such merger or consolidation, as the case may be, would not be owned by
the holders of the capital stock of the Corporation before such merger or
consolidation.

     8.   Amendments. No provision of the terms of the Series A Convertible
          ----------                                                       
Preferred Stock or Series B Convertible Preferred Stock may be amended, modified
or waived without the written consent or affirmative vote of the holders of at
least 66.67% of the then outstanding shares of Series A Convertible Preferred
Stock and Series B Convertible Preferred Stock; provided, however, that if such
amendment or action would adversely affect or significantly alter such rights of
only one of such series of Preferred Stock, then the holders of such series
shall be entitled to approve as aforesaid such amendment or action, voting or
consenting separately as a series.

                                       22
<PAGE>
 
     SECOND:  That said amendment has been consented to and authorized by all
the holders of the issued and outstanding capital stock of the Corporation by
written consent given in accordance with the provisions of Section 228 of the
General Corporation Law of the State of Delaware.

     THIRD:  That the aforesaid amendment was duly adopted in accordance with
the applicable provisions of Section 242 of the General Corporation Law of the
State of Delaware.

     IN WITNESS WHEREOF, said Corporation has caused this Certificate of
Amendment to be signed by Edward C. Hutcheson, Jr., its President, and attested
by Ted B. Miller, Jr., its Secretary, this the 2nd day of July, 1996, and by
execution hereof does declare and certify that this is the act and deed of the
Corporation and the facts herein stated are true.


                                    /s/ EDWARD C. HUTCHESON, JR.
                                    --------------------------------------------
                                    Edward C. Hutcheson, Jr., President


                                    /s/ TED B. MILLER, JR.
                                    --------------------------------------------
                                    Ted B. Miller, Jr., Secretary

                                       23

<PAGE>
 
                                                                     Exhibit 3.3

                          CERTIFICATE OF AMENDMENT OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                           CASTLE TOWER HOLDING CORP.


     Castle Tower Holding Corp., a corporation organized and existing and by
virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), DOES HEREBY CERTIFY:

     FIRST:  That the Board of Directors of said Corporation by Unanimous
Written Consent, adopted the following resolution:

          RESOLVED, that the Corporation amend Article FOURTH of its Certificate
     of Incorporation as on file with the Secretary of State of Delaware to read
     in its entirety as set forth below:

     FOURTH: The Corporation shall be authorized to issue 13,047,733 shares of
capital stock, which shall be divided into 270,000 shares of Class A Common
Stock, with a par value of one cent ($.01) per share (the "Class A Stock"),
7,000,000 shares of Class B Common Stock, with a par value of one cent ($.01)
per share (the "Class B Stock"), and 5,777,733 shares of Preferred Stock, with a
par value of one cent ($.01) per share (the "Preferred Stock").

     The following is a statement of the designations, preferences, voting
powers, qualifications, special or relative rights and privileges in respect of
the authorized capital stock of the Corporation.

I.   CLASS A COMMON STOCK AND CLASS B COMMON STOCK
     ---------------------------------------------

     1.   General.  Except as specifically set forth herein, the rights of the
          -------                                                             
holders of Class A Stock and Class B Stock shall be identical, and the Class A
Stock and Class B Stock shall be treated as a single class of Common Stock and
shall be referred to herein collectively as the "Common Stock." The voting,
dividend and liquidation rights of the holders of the Class A Stock and Class B
Stock are subject to and qualified by the rights of the holders of the Preferred
Stock.

     2.   Voting.  The holders of the Class B Stock are entitled to one vote for
          ------                                                                
each share held at all meetings of stockholders (and written actions in lieu of
meetings). The holders of Class A Stock are entitled to such number of votes per
share of Class A Stock as shall equal the number of shares of Class B Stock
(including fractions of a share) into which each share of Class A Stock is then
convertible. There shall be no cumulative voting.

     3.   Dividends.  Dividends may be declared and paid on the Class A Stock
          ---------                                                          
and Class B Stock from funds lawfully available therefor as and when determined
by the Board of Directors and subject to any preferential dividend rights of any
then outstanding Preferred Stock. Any dividend declared by the Board of
Directors shall be declared and paid upon the outstanding shares of Class A
Stock and Class B Stock in equal amounts per share (treating each share of Class
A Stock as being equal to the number of shares of Class B Stock (including
fractions of a share) into which each share of Class A Stock is then
convertible) and without preference or
<PAGE>
 
priority of either the Class A Stock or the Class B Stock over the other,
provided that dividends payable in stock of the Corporation may be declared and
paid on the Class A Stock in shares of Class A Stock and on the Class B Stock in
shares of Class B Stock.

     4.   Liquidation. Dissolution or Winding Up. In the event of any voluntary
          --------------------------------------                               
or involuntary liquidation, dissolution or winding up on the Corporation, after
payment of all preferential amounts required to be paid to the holders of
Preferred Stock, the holders of shares of Class A Stock and Class B Stock then
outstanding shall share ratably in any distribution of the remaining assets and
funds of the Corporation in proportion to the respective amounts which would
otherwise be payable in respect of the shares held by them upon such
distribution if all amounts payable on or with respect to such shares were paid
in full. For this purpose, each share of Class A Stock shall be entitled to
receive the amount which would be payable shares of Class B Stock issued on
conversion of such Class A Stock if such conversion had occurred immediately
prior to such distribution.

5.   Conversion of Class A Stock.
     --------------------------- 

     5A.  Optional Conversion. Each share of Class A Stock shall be convertible,
          -------------------                                                   
at the option of the holder, at any time and from time to time, into 1.5231
shares of fully paid and non assessable shares of Class B Stock ("Class A
Conversion Rate").

     5B.  Mandatory Conversion. The Corporation may, at its option, require all
          --------------------                                                 
(and not less than all) holders of shares of Class A Stock then outstanding to
convert their shares of Class A Stock into shares of Class B Stock, at the then
effective Class A Conversion Rate pursuant to Section 5A, simultaneously with
the conversion of outstanding shares of Preferred Stock pursuant to Section
II.5O. of this Article Fourth. All holders of record of shares of Class A Stock
will be given at least 10 days' prior written notice of the date fixed and the
place designated for mandatory conversion of all such shares of Class A Stock.
Such notice will be sent by first class or registered mail, postage prepaid, to
each record holder of Class A Stock at such holder's address last shown on the
records of the transfer agent for the Class A Stock (or the records of the
Corporation, if it serves as its own transfer agent). On or before the date
fixed for conversion, each holder of shares of Class A Stock shall surrender his
or its certificate or certificates for all such shares to the Corporation at the
place designated in such notice, and shall thereafter receive certificates for
the number of shares of Class B Stock to which such holder is entitled. On the
date fixed for conversion, all rights with respect to the Class A Stock so
converted, including the rights, if any, to receive notices and vote, will
terminate, except only the rights of the holders thereof, upon surrender of
their certificate or certificates thereof, to receive certificates for the
number of shares of Class B Stock into which such Class A Stock has been
converted. If so required by the Corporation, certificates surrendered for
conversion shall be endorsed or accompanied by written instrument or instruments
of transfer, in form reasonably satisfactory to the Corporation, duly executed
by the registered holder or by his or its attorney duly authorized in writing.
As promptly as practicable after the date of such mandatory conversion and the
surrender of the certificate or certificates for Class A Stock, the Corporation
shall cause to be issued and delivered to such holder, or on his or its written
order, a certificate or certificates for the number of full shares of Class B
Stock issuable on such conversion in accordance with the provisions hereof. All
certificates evidencing shares of Class A Stock which are required to be
surrendered for conversion in accordance with the provisions hereof shall, from
and after the date such certificates are so required to be surrendered, be
deemed to have been retired and canceled

                                       2
<PAGE>
 
and the shares of Class A Stock represented thereby converted into Class B Stock
for all purposes, notwithstanding the failure of the holder or holders thereof
to surrender such certificates on or prior to such date. The Corporation may
thereafter take such appropriate action as may be necessary to reduce the
authorized Class A Stock accordingly.

     5C.  Fractional Shares: Partial Conversion. No fractional shares shall be
          -------------------------------------                               
issued upon conversion of Class A Stock into Class B Stock.  In case the number
of shares of Class A Stock represented by the certificate or certificates
surrendered pursuant to subparagraph 5A exceeds the number of shares converted,
the Corporation shall, upon such conversion, execute and deliver to the holder,
at the expense of the Corporation, a new certificate or certificates for the
number of shares of Class A Stock represented by the certificate or certificates
surrendered which are not to be converted. If any fractional share of Class B
Stock would, except for the provisions of the first sentence of this
subparagraph 5D, be delivered upon such conversion, the Corporation, in lieu of
delivering such fractional share, shall pay to the holder surrendering the Class
A Stock for conversion an amount in cash equal to the current market price of
such fractional share as determined in good faith by the Board of Directors of
the Corporation without minority, marketability or similar discounts. In the
event of a liquidation of the Corporation, the aforesaid conversion rights shall
terminate at the close of business on the first full day preceding the date
fixed for the payment of any amounts distributable on liquidation to the holders
of Class A Stock. In order for a holder of Class A Stock to convert shares of
Class A Stock into shares of Class B Stock, such holder shall surrender the
certificate or certificates for such shares of Class A Stock, at the office of
the transfer agent for the Class A Stock (or at the principal office of the
Corporation if the Corporation serves as its own transfer agent), together with
written notice that such holder elects to convert all or any number of the
shares of Class A Stock represented by such certificate or certificates. Such
notice shall state such holder's name or the names of the nominees in which such
holder wishes the certificate or certificates for shares of Class B Stock to be
issued. If required by the Corporation, certificates surrendered for conversion
shall be endorsed or accompanied by a written instrument or instruments of
transfer, in form satisfactory to the Corporation, duly executed by the
registered holder or his or its attorney duly authorized in writing. The date of
receipt of such certificates and notice by the transfer agent (or by the
Corporation if the Corporation serves as its own transfer agent) shall be the
conversion date ("Class A Stock Conversion Date"). The Corporation shall, as
soon as practicable after the Class A Stock Conversion Date, issue and deliver
at such office to such holder of Class A Stock, or to his or its nominees, a
certificate or certificates for the number of shares of Class B Stock to which
such holder shall be entitled. The Corporation shall at all times when the Class
A Stock shall be outstanding, reserve and keep available out of its authorized
but unissued stock, for the purpose of effecting the conversion of the Class A
Stock, such number of its duly authorized shares of Class B Stock as shall from
time to time be sufficient to effect the conversion of all outstanding Class A
Stock. All shares of Class A Stock which shall have been surrendered for
conversion as herein provided shall no longer be deemed to be outstanding and
all rights with respect to such shares, including the rights, if any, to receive
notices and to vote, shall immediately cease and terminate on the Class A Stock
Conversion Date, except only the right of the holders thereof to receive shares
of Class B Stock in exchange therefor. Any shares of Class A Stock so converted
shall be retired and canceled and shall not be reissued, and the Corporation may
from time to time take such appropriate action as may be necessary to reduce the
authorized Class A Stock accordingly.

                                       3
<PAGE>
 
     5D.  Subdivision or Combination of Class B Stock.  In case the Corporation
          -------------------------------------------                          
shall at any time subdivide (by any stock split, stock dividend or otherwise)
its outstanding shares of Class B Stock into a greater number of shares, the
Class A Conversion Rate pursuant to Section 5A shall be proportionately
increased, and, conversely, in case the outstanding shares of Class B Stock
shall be combined into a smaller number of shares, the conversion rate shall be
proportionately reduced.

     5E.  Reorganization or Reclassification.  If any capital reorganization or
          ----------------------------------                                   
reclassification of the capital stock of the Corporation shall be effected in
such a way that holders of Class B Stock shall be entitled to receive stock,
securities or assets with respect to or in exchange for Class B Stock, then, as
a condition of such reorganization or reclassification, lawful and adequate
provisions shall be made whereby each holder of a share or shares of Class A
Stock shall thereupon have the right to receive, upon the basis and upon the
terms and conditions specified herein and in lieu of the shares of Class B Stock
immediately theretofore receivable upon the conversion of such share or shares
of Class A Stock, such shares of stock, securities or assets as may be issued or
payable with respect to or in exchange for a number of outstanding shares of
such Class B Stock equal to the number of shares of such Class B Stock
immediately theretofore receivable upon such conversion had such reorganization
or reclassification not taken place, and in any such case appropriate provisions
shall be made with respect to the rights and interests of such holder to the end
that the provisions hereof (including without limitation provisions for
adjustments of the Class A Conversion Rate) shall thereafter be applicable, as
nearly as may be, in relation to any shares of stock, securities or assets
thereafter deliverable upon the exercise of such conversion rights.

     5F.  Notice of Adjustment. Upon any adjustment of the Class A Conversion
          --------------------                                               
Rate, then and in each such case the Corporation shall give written notice
thereof, by delivery in person, certified or registered mail, return receipt
requested, telecopier or telex, addressed to each holder of shares of Class A
Stock at the address of such holder as shown on the books of the Corporation,
which notice shall state the conversion rate resulting from such adjustment,
setting forth in reasonable detail the method upon which such calculation is
based.

     5G.  Other Notices.  In case at any time:
          -------------                       

     (1)  the Corporation shall declare any dividend upon its Class B Stock
payable in cash or stock or make any other distribution to the holders of its
Class B Stock;

     (2)  the Corporation shall offer for subscription pro rata to the holders
of its Class B Stock any additional shares of stock of any class or other
rights;

     (3)  there shall be any capital reorganization or reclassification of the
capital stock of the Corporation, or a consolidation or merger of the
Corporation with or into another entity or entities, or a sale, lease,
abandonment, transfer or other disposition of all or substantially all its
assets; or

     (4)  there shall be a voluntary or involuntary dissolution, liquidation or
winding up of the Corporation; then, in any one or more of said cases, the
Corporation shall give, by delivery in person, certified or registered mail,
return receipt requested, telecopier or telex, addressed to each holder of any
shares of Class A Stock at the address of such holder as shown on the books

                                       4
<PAGE>
 
of the Corporation, (a) at least 20 days' prior written notice of the date on
which the books of the Corporation shall close or a record shall be taken for
such dividend, distribution or subscription rights or for determining rights to
vote in respect of any such reorganization, reclassification, consolidation,
merger, disposition, dissolution, liquidation or winding up and (b) in the case
of any such reorganization, reclassification, consolidation, merger,
disposition, dissolution, liquidation or winding up, at least 20 days' prior
written notice of the date when the same shall take place. Such notice in
accordance with the foregoing clause (a) shall also specify, in the case of any
such dividend, distribution or subscription rights, the date on which the
holders of Class B Stock shall be entitled thereto and such notice in accordance
with the foregoing clause (b) shall also specify the date on which the holders
of Class B Stock shall be entitled to exchange their Class B Stock for
securities or other property deliverable upon such reorganization,
reclassification, consolidation, merger, disposition, dissolution, liquidation
or winding up, as the case may be.

     5H.  Stock to be Reserved.  The Corporation will at all times reserve and
          --------------------                                                
keep available out of its authorized Class B Stock, solely for the purpose of
issuance upon the conversion of Class A Stock as herein provided, such number of
shares of Class B Stock as shall then be issuable upon the conversion of all
outstanding shares of Class A Stock. The Corporation covenants that all shares
of Class B Stock which shall be so issued shall be duly and validly issued and
fully paid and nonassessable and free from all taxes, liens and charges with
respect to the issue thereof. The Corporation will take all such action as may
be necessary to assure that all such shares of Class B Stock may be so issued
without violation of any applicable law or regulation, or of any requirement of
any national securities exchange upon which the Class B Stock may be listed. The
Corporation will not take any action which results in any adjustment of the
Class A Conversion Rate if the total number of shares of Class B Stock issued
and issuable after such action upon conversion of the Class A Stock would exceed
the total number of shares of Class B Stock then authorized by the Certificate
of Incorporation.

     5I.  No Reissuance of Class A Stock. Shares of Class A Stock which are
          ------------------------------                                   
converted into shares of Class B Stock as provided herein shall not be reissued.

II.  PREFERRED STOCK
     ---------------

     1.   Designation. There shall be a series of Preferred Stock designated and
          -----------                                                           
known as "Series A Convertible Preferred Stock" consisting of 1,383,333 shares;
a series of Preferred Stock designated and known as "Series B Convertible
Preferred Stock" consisting of 864,568 shares; and a series of Preferred Stock
designated and known as "Series C Convertible Preferred Stock" consisting of
3,529,832 shares.

     2.   Voting.
          ------ 

     2A.  General. Except as may be otherwise provided in these terms of the
          -------                                                           
Preferred Stock or by law, the Preferred Stock shall vote together with all
other classes and series of stock of the Corporation as a single class on all
actions to be taken by the stockholders of the Corporation. Each share of
Preferred Stock shall entitle the holder thereof to such number of votes per
share on each such action as shall equal the number of shares of Class B Stock
(including fractions of a share) into which each share of Preferred Stock is
then convertible.

                                       5
<PAGE>
 
     2B.  Board Size. The Corporation shall not, without the written consent or
          ----------                                                           
affirmative vote of the holders of at least two-thirds of the then outstanding
shares of Preferred Stock (calculated on an "as converted" basis) voting
together, consenting or voting (as the case may be) separately from all other
classes or series of capital stock, increase the maximum number of directors
constituting the Board of Directors to a number in excess of nine (9).

     2C.  Board Seats. The holders of the Preferred Stock voting together,
          -----------                                                     
separately from all other classes and series of capital stock of the Corporation
shall be entitled to elect five (5) directors of the Corporation. The holders of
the Class A Stock voting as a separate class, shall be entitled to elect two (2)
directors of the Corporation. The holders of the Preferred Stock and both
classes of Common Stock, voting together as a single class, shall be entitled to
elect two (2) directors of the Corporation (with each share of Preferred Stock
entitled to that number of votes per share on each such action as shall equal
the number of shares of Class B Stock (including fractions of a share) into
which each share of Preferred Stock is then convertible.) At any meeting (or in
a written consent in lieu thereof) held for the purpose of electing directors,
the presence in person or by proxy (or the written consent) of the holders of a
majority (calculated on an "as converted" basis) of the shares of Preferred
Stock then outstanding shall constitute a quorum of the Preferred Stock for the
election of directors to be elected solely by the holders of the Preferred Stock
or jointly by the holders of the Preferred Stock and the Common Stock.  A
vacancy in any directorship elected by the holders of the Preferred Stock shall
be filled only by vote or written consent of the holders of the Preferred Stock,
a vacancy in any directorship elected by the holders of the Class A Stock shall
be filled only by vote or written consent of the holders of the Class A Stock
and a vacancy in any directorship elected jointly by the holders of the
Preferred Stock and the Common Stock shall be filled only by vote or written
consent of the holders of Preferred Stock and the Common Stock as provided
above.

     3.   Dividends. The holders of the Preferred Stock shall be entitled to
          ---------                                                         
receive, out of funds legally available therefore, and the Company shall declare
and pay dividends on the Preferred Stock at the same rate as dividends (other
than dividends payable in additional shares of Common Stock) are declared and
paid with respect to the Common Stock (treating each share of Preferred Stock as
being equal to the number of shares of Common Stock (including fractions of a
share) into which each share of Preferred Stock is then convertible).

     4.   Liquidation. Upon any liquidation, dissolution or winding up of the
          -----------                                                        
Corporation, whether voluntary or involuntary, before any distribution or
payment is made with respect to the Common Stock or any other series of capital
stock, holders of each share of Preferred Stock shall be entitled to be paid as
follows:  (A) to the holders of Series A Convertible Preferred Stock, an amount
equal to the greater of (i) $6.00 per share (subject to adjustment for stock
splits, stock dividends, reorganizations, reclassification or other similar
events) plus, in the case of each share, an amount equal to all dividends
declared but unpaid thereon, computed to the date payment thereof is made
available, or (ii) such amount per share as would have been payable had each
such share been converted to Common Stock pursuant to paragraph 5 of this
Section II immediately prior to such liquidation, dissolution or winding up, and
the holders of Series A Convertible Preferred Stock shall not be entitled to any
further payment, such amount payable with respect to one share of Series A
Convertible Preferred Stock being sometimes referred to as the "Series A
Liquidation Payment" and with respect to all shares of Series A Convertible
Preferred Stock being sometimes referred to as the "Series A Liquidation
Payments"; (B) to the holders of Series B Convertible Preferred Stock, an amount
equal to the greater of (i) $12.00 per

                                       6
<PAGE>
 
share (subject to adjustment for stock splits, stock dividends, reorganizations,
reclassification or other similar events) plus, in the case of each share, an
amount equal to all dividends declared but unpaid thereon, computed to the date
payment thereof is made available, or (ii) such amount per share as would have
been payable had each such share been converted to Common Stock pursuant to
paragraph 5 of this Section II immediately prior to such liquidation,
dissolution or winding up, and the holders of Series B Convertible Preferred
Stock shall not be entitled to any further payment, such amount payable with
respect to one share of Series B Convertible Preferred Stock being sometimes
referred to as the "Series B Liquidation Payment" and with respect to all shares
of Series B Convertible Preferred Stock being sometimes referred to as the
"Series B Liquidation Payments"; and (C) to the holders of Series C Convertible
Preferred Stock, an amount equal to the greater of (i) $21.00 per share (subject
to adjustment for stock splits, stock dividends, reorganizations,
reclassification or other similar events) plus, in the case of each share, an
amount equal to all dividends declared but unpaid thereon, computed to the date
payment thereof is made available, or (ii) such amount per share as would have
been payable had each such share been converted to Common Stock pursuant to
paragraph 5 of this Section II immediately prior to such liquidation,
dissolution or winding up, and the holders of Series C Convertible Preferred
Stock shall not be entitled to any further payment, such amount payable with
respect to one share of Series C Convertible Preferred Stock being sometimes
referred to as the "Series C Liquidation Payment" and with respect to all shares
of Series C Convertible Preferred Stock being sometimes referred to as the
"Series C Liquidation Payments" and the Series A Liquidation Payments, Series B
Liquidation Payments and Series C Liquidation Payments being sometimes generally
referred to as the "Liquidation Payments".  The Series B Convertible Preferred
Stock and Series C Convertible Preferred Stock shall be in parity in right of
payment pursuant to this paragraph 4 and shall be senior in right of payment
over the Series A Convertible Preferred Stock and the holders of Series B
Convertible Preferred Stock and Series C Convertible Preferred Stock shall be
paid, respectively, all Series B Liquidation Payments and Series C Liquidation
Payments prior to the payment of any Series A Liquidation Payments.  If upon
such liquidation, dissolution or winding up of the Corporation, whether
voluntary or involuntary, the assets to be distributed among the holders of
Series B Convertible Preferred Stock and Series C Convertible Preferred Stock
shall be insufficient to permit payment to the holders of Series B Convertible
Preferred Stock and Series C Convertible Preferred Stock of the amount
distributable as aforesaid, then the entire assets of the Corporation to be so
distributed shall be distributed among the holders of the Series B Convertible
Preferred Stock and Series C Convertible Preferred Stock in proportion to the
full undistributed preferential Liquidation Payment that each holder of Series B
Convertible Preferred Stock and Series C Convertible Preferred Stock would
otherwise be entitled to receive in the manner and priority of distribution set
forth above.  If upon such liquidation, dissolution or winding up of the
Corporation, whether voluntary or involuntary, the assets to be distributed
among the holders of Series A Convertible Preferred Stock shall be insufficient
to permit payment to the holders of Series A Convertible Preferred Stock of the
amount distributable as aforesaid, then the entire assets of the Corporation
available to be so distributed, if any, shall be distributed ratably among the
holders of Series A Convertible Preferred Stock. Upon any such liquidation,
dissolution or winding up of the Corporation, after the holders of Preferred
Stock shall have been paid in full the entire Liquidation Payments to which they
shall be entitled, the remaining net assets of the Corporation may be
distributed to the holders of stock ranking on liquidation junior to the
Preferred Stock. Written notice of such liquidation, dissolution or winding up,
stating a payment date, the amount of the Liquidation Payments and the place
where said Liquidation Payments shall be payable, shall be delivered in person,
mailed by certified or registered mail, return receipt requested, or
sent by telecopier or telex, not less than 20 days prior to the payment 

                                       7
<PAGE>
 
date stated therein, to the holders of record of Preferred Stock entitled to
such Liquidation Payments, such notice to be addressed to each such holder at
its address as shown by the records of the Corporation. The consolidation or
merger of the Corporation into or with any other entity or entities which
results in the exchange of outstanding shares of the Corporation for securities
or other consideration issued or paid or caused to be issued or paid by any such
entity or affiliate thereof (other than a merger to reincorporate the
Corporation in a different jurisdiction), and the sale, lease, abandonment,
transfer or other disposition by the Corporation of all or substantially all its
assets, shall be deemed to be a liquidation, dissolution or winding of the
Corporation within the meaning of the provisions of this paragraph 4.

     5.   Conversion.  The holders of shares of Preferred Stock shall have the
          ----------                                                          
following conversion rights:

     5A.  Optional Conversion.  Subject to the terms and conditions of this
          -------------------                                              
paragraph 5, the holder of any share or shares of Preferred Stock shall have the
right, at its option at any time, to convert any such shares of Preferred Stock
(except that upon any liquidation of the Corporation the right of conversion
shall terminate at the close of business on the business day fixed for payment
of the amount distributable on the Preferred Stock) into such number of fully
paid and nonassessable shares of Class B Stock as is obtained by (A) in the case
of Series A Convertible Preferred Stock (i) multiplying the number of shares of
Series A Convertible Preferred Stock so to be converted by $6.00 and (ii)
dividing the result by the conversion price of $6.00 per share or, in case an
adjustment of such price has taken place pursuant to the further provisions of
this paragraph 5, then by the conversion price as last adjusted and in effect at
the date any share or shares of Series A Convertible Preferred Stock are
surrendered for conversion (such price, or such price as last adjusted, being
referred to as the " Series A Conversion Price"), (B) in the case of the Series
B Convertible Preferred Stock (i) multiplying the number of shares of Series B
Convertible Preferred Stock so to be converted by $12.00 and (ii) dividing the
result by the conversion price of $12.00 per share or, in case an adjustment of
such price has taken place pursuant to the further provisions of this paragraph
5, then by the conversion price as last adjusted and in effect at the date any
share or shares of Series B Convertible Preferred Stock are surrendered for
conversion (such price, or such price as last adjusted, being referred to as the
"Series B Conversion Price"), and (C) in the case of the Series C Convertible
Preferred Stock (i) multiplying the number of shares of Series C Convertible
Preferred Stock so to be converted by $21.00 and (ii) dividing the result by the
conversion price of $21.00 per share or, in case an adjustment of such price has
taken place pursuant to the further provisions of this paragraph 5, then by the
conversion price as last adjusted and in effect at the date any share or shares
of Series C Convertible Preferred Stock are surrendered for conversion (such
price, or such price as last adjusted, being referred to as the "Series C
Conversion Price" and the Series A Conversion Price, Series B Conversion Price
and Series C Conversion Price being generally referred to as the "Conversion
Price").  Such rights of conversion shall be exercised by the holder thereof by
giving written notice that the holder elects to convert a stated number of
shares of Preferred Stock into Class B Stock and by surrender of a certificate
or certificates for the shares so to be converted to the Corporation at its
principal office (or such other of office or agency of the Corporation as the
Corporation may designate by notice in writing to the holders of the Preferred
Stock) at any time during its usual business hours on the date set forth in such
notice, together with a statement of the name or names (with address) in which
the certificate or certificates for shares of Class B Stock shall be issued.

                                       8
<PAGE>
 
     5B.  Issuance of Certificates: Time Conversion Effected.  Promptly after
          --------------------------------------------------                 
the receipt of the written notice referred to in subparagraph 5A and surrender
of the certificate or certificates for the share or shares of Preferred Stock to
be converted, the Corporation shall issue and deliver, or cause to be issued and
delivered, to the holder, registered in such name or names as such holder may
direct, a certificate or certificates for the number of whole shares of Class B
Stock issuable upon the conversion of such share or shares of Preferred Stock.
To the extent permitted by law, such conversion shall be deemed to have been
effected and the Conversion Price shall be determined as of the close of
business on the date on the date on which such written notice shall have been
received by the Corporation and the certificate or certificates for such share
or shares shall have been surrendered as aforesaid, and at such time the rights
of the holder of such share or shares of Preferred Stock shall cease, and the
person or persons in whose name or names any certificate or certificates for
shares of Class B Stock shall be issuable upon such conversion shall be deemed
to have become the holder or holders of record of the shares represented
thereby.

     5C.  Fractional Shares: Dividends: Partial Conversion.  No fractional
          ------------------------------------------------                
shares shall be issued upon conversion of Preferred Stock into Class B Stock and
no payment or adjustment shall be made upon any conversion on account of any
cash dividends on the Class B Stock issued upon such conversion. At the time of
each conversion, the Corporation shall pay in cash an amount equal to all
dividends, declared but unpaid on the shares of Preferred Stock surrendered for
conversion to the date upon which such conversion is deemed to take place as
provided in subparagraph 5B. In case the number of shares of Preferred Stock
represented by the certificate or certificates surrendered pursuant to
subparagraph 5A exceeds the number of shares converted, the Corporation shall,
upon such conversion, execute and deliver to the holder, at the expense of the
Corporation, a new certificate or certificates for the number of shares of
Preferred Stock represented by the certificate or certificates surrendered which
are not to be converted. If any fractional share of Class B Stock would, except
for the provisions of the first sentence of this subparagraph 5C, be delivered
upon such conversion, the Corporation, in lieu of delivering such fractional
share, shall pay to the holder surrendering the Preferred Stock for conversion
an amount in cash equal to the current market price of such fractional share as
determined in good faith by the Board of Directors of the Corporation.

     5D.  Adjustment of Series A Conversion Price and Series C Conversion Price
          ---------------------------------------------------------------------
Upon Issuance of Common Stock.  Except as provided in subparagraph 5E, if and
- -----------------------------                                                
whenever the Corporation shall hereafter issue or sell, or is, in accordance
with subparagraphs 5D(1) through 5D(6), deemed to have issued or sold, any
shares of  Common Stock for a consideration per share less than the Series C
Conversion Price (or Series A Conversion Price as to an adjustment to the Series
A Conversion Price pursuant to this Section 5D) in effect immediately prior to
the time of such issue or sale, then, forthwith upon such issue or sale, the
Series C Conversion Price (or Series A Conversion Price, if applicable) shall be
reduced to the price determined by dividing (i) an amount equal to the sum of
(a) the number of shares of Common Stock outstanding immediately prior to such
issue or sale (determined on a fully diluted basis after giving effect to the
conversion of all Preferred Stock and to the exercise of all options and
warrants which are then exercisable) multiplied by the then existing Series C
Conversion Price (or Series A Conversion Price, if applicable) and (b) the
consideration, if any, received by the Corporation upon such issue or sale, by
(ii) the total number of shares of Common Stock outstanding immediately after
such issue or sale (determined on a fully diluted basis after giving effect to
the conversion of all Preferred Stock and to the exercise of all options and
warrants which are then exercisable).

                                       9
<PAGE>
 
     For purposes of this subparagraph 5D, the following subparagraphs 5D(1) to
5D(6) shall also be applicable:

     5D(1)   Issuance of Rights or Options.  In case at any time hereafter the
             -----------------------------                                    
Corporation shall in any manner grant (whether directly or by assumption in a
merger or otherwise) any warrants or other rights to subscribe for or to
purchase, or any options for the purchase of, Common Stock or any stock or
security convertible into or exchangeable for Common Stock (such warrants,
rights or options being called "Options" and such convertible or exchangeable
stock or securities being called "Convertible Securities") whether or not such
Options or the right to convert or exchange any such Convertible Securities are
immediately exercisable, and the price per share for which Common Stock is
issuable upon the exercise of such Options or upon the conversion or exchange of
such Convertible Securities (determined by dividing (i) the total amount, if
any, received or receivable by the Corporation as consideration for the granting
of such Options, plus the minimum aggregate amount of additional consideration
payable to the Corporation upon the exercise of all such Options, plus, in the
case of such Options which relate to Convertible Securities, the minimum
aggregate amount of additional consideration, if any, payable upon the issue or
sale of such Convertible Securities and upon the conversion or exchange thereof,
by (ii) the total maximum number of shares of Common Stock issuable upon the
exercise of such Options or upon the conversion or exchange of all such
Convertible Securities issuable upon the exercise of such Options) shall be less
than the Series A Conversion Price or Series C Conversion Price, as applicable,
in effect immediately prior to the time of the granting of such Options, then
the total maximum number of shares of Common Stock issuable upon the exercise of
such Options or upon conversion or exchange of the total maximum amount of such
Convertible Securities issuable upon the exercise of such Options shall be
deemed to have been issued for such price per share as of the date of granting
of such Options or the issuance of such Convertible Securities and thereafter
shall be deemed to be outstanding.  Except as otherwise provided in subparagraph
5D(3), no adjustment of the Series A Conversion Price or Series C Conversion
Price shall be made upon the actual issue of such Common Stock or of such
Convertible Securities upon exercise of such Options or upon the actual issue of
such Common Stock upon conversion or exchange of such Convertible Securities.

     5D(2)   Issuance of Convertible Securities.  In case the Corporation shall
             ----------------------------------                                
hereafter in any manner issue (whether directly or by assumption in a merger or
otherwise) or sell any Convertible Securities, whether or not the rights to
exchange or convert any such Convertible Securities are immediately exercisable,
and the price per share for which Common Stock is issuable upon such conversion
or exchange (determined by dividing (i) the total amount received or receivable
by the Corporation as consideration for the issue or sale of such Convertible
Securities, plus the minimum aggregate amount of additional consideration, if
any, payable to the Corporation upon the conversion or exchange thereof, by (ii)
the total maximum number of shares of Common Stock issuable upon the conversion
or exchange of all such Convertible Securities) shall be less than the Series A
Conversion Price or Series C Conversion Price, as applicable, in effect
immediately prior to the time of such issue or sale, then the total maximum
number of shares of Common Stock issuable upon conversion or exchange of all
such Convertible Securities shall be deemed to have been issued for such price
per share as of the date of the issue or sale of such Convertible Securities and
thereafter shall be deemed to be outstanding, provided that (a) except as
otherwise provided in subparagraph 5D(3), no adjustment of the Series A
Conversion Price or Series C Conversion Price shall be made upon the actual
issue of such Common Stock upon conversion or exchange of such Convertible
Securities and (b) if any such issue or sale of such 

                                      10
<PAGE>
 
Convertible Securities is made upon exercise of any Options to purchase any
such Convertible Securities for which adjustments of the Series A Conversion
Price or Series C Conversion Price have been or are to be made pursuant to other
provisions of this subparagraph 5D, no further adjustment of the Series A
Conversion Price or Series C Conversion Price, as applicable, shall be made by
reason of such issue or sale.

     5D(3)   Change in Option Price or Conversion Rate.  Upon the happening of
             -----------------------------------------                        
any of the following events, namely, if the purchase price provided for in any
Option referred to in subparagraph 5D(1), the additional consideration, if any,
payable upon the conversion or exchange of any Convertible Securities referred
to in subparagraph 5D(1) or 5D(2) or the rate at which Convertible Securities
referred to in subparagraph 5D(1) or 5D(2) are convertible into or exchangeable
for Common Stock shall change at any time (including, but not limited to,
changes under or by reason of provisions designed to protect against dilution),
the Series A Conversion Price and Series C Conversion Price, as applicable, in
effect at the time of such event shall forthwith be readjusted to the Series A
Conversion Price or Series C Conversion Price, as applicable, which would have
been in effect at such time had such Options or Convertible Securities still
outstanding provided for such changed purchase price, additional consideration
or conversion rate, as the case may be, at the time initially granted, issued or
sold, but only if as a result of such adjustment the Series A Conversion Price
or Series C Conversion Price, as applicable, then in effect hereunder is thereby
reduced; and on the termination of any such Option or any such right to convert
or exchange such Convertible Securities, the Series A Conversion Price and
Series C Conversion Price, as applicable, then in effect hereunder shall
forthwith be increased to the Series A Conversion Price or Series C Conversion
Price, as applicable, which would have been in effect at the time of such
termination had such Option or Convertible Securities, to the extent outstanding
immediately prior to such termination, never been issued.

     5D(4)   Consideration for Stock.  In case any shares of Common Stock,
             -----------------------                                      
Options or Convertible Securities shall be issued or sold for cash, the
consideration received therefor shall be deemed to be the amount received by the
Corporation therefor, without deduction therefrom of any expenses incurred or
any underwriting commissions or concessions paid or allowed by the Corporation
in connection therewith. In case any shares of Common Stock, Options or
Convertible Securities shall be issued or sold for a consideration other than
cash, the amount of the consideration other than cash received by the
Corporation shall be deemed to be the fair value of such consideration as
determined in good faith by the Board of Directors of the Corporation, without
deduction of any expenses incurred or any underwriting commissions or
concessions paid or allowed by the Corporation in connection therewith. In case
any Options shall be issued in connection with the issue and sale of other
securities of the Corporation, together comprising one integral transaction in
which no specific consideration is allocated to such Options by the parties
thereto, such Options shall be deemed to have been issued for such consideration
as determined in good faith by the Board of Directors of the Corporation.

     5D(5)   Record Date.  In case the Corporation shall take a record of the
             -----------                                                     
holders of its Common Stock for the purpose of entitling them (i) to receive a
dividend or other distribution payable in Common Stock, Options or Convertible
Securities or (ii) to subscribe for or purchase Common Stock, Options or
Convertible Securities, then such record date shall be deemed to be the date of
the issue or sale of the shares of Common Stock deemed to have been issued or
sold upon the declaration of such dividend or the making of such other
distribution or the date of the granting of such right of subscription or
purchase, as the case may be.

                                      11
<PAGE>
 
     5D(6)   Treasury Shares.  The number of shares of Common Stock outstanding
             ---------------                                                   
at any given time shall not include shares owned or held by or for the account
of the Corporation, and the disposition of any such shares shall be considered
an issue or sale of Common Stock for the purpose of this subparagraph 5D.

     5E.  Certain Issues of Common Stock Excepted.  Anything herein to the
          ---------------------------------------                         
contrary notwithstanding, the Corporation shall not be required to make any
adjustment of the Series A Conversion Price or Series C Conversion Price in the
case of the issuance from and after the date of filing hereof of shares of Class
B Stock issued upon the conversion of (a) shares of Preferred Stock, (b) shares
of Class A Stock, (c) the Company's outstanding Convertible Secured Subordinated
Notes in the aggregate principal amount of $3,125,268.00 (the "Convertible
Notes"), or (d) pursuant to the grant or exercise of options under any employee
stock option plan approved by the Board of Directors of the Company and the
holders of Preferred Stock pursuant to Section 7 hereof.

     5F.  Subdivision or Combination of Common Stock.  In case the Corporation
          ------------------------------------------                          
shall at any time subdivide (by any stock split, stock dividend or otherwise)
its outstanding shares of Common Stock into a greater number of shares, the
Conversion Price in effect immediately prior to such subdivision shall be
proportionately reduced, and, conversely, in case the outstanding shares of
Common Stock shall be combined into a smaller number of shares, the Conversion
Price in effect immediately prior to such combination shall be proportionately
increased.

     5G.  Reorganization or Reclassification.  If any capital reorganization or
          ----------------------------------                                   
reclassification of the capital stock of the Corporation shall be effected in
such a way that holders of Class B Stock shall be entitled to receive stock,
securities or assets with respect to or in exchange for Class B Stock, then, as
a condition of such reorganization or reclassification, lawful and adequate
provisions shall be made whereby each holder of a share or shares of Preferred
Stock shall thereupon have the right to receive, upon the basis and upon the
terms and conditions specified herein and in lieu of the shares of Class B Stock
immediately theretofore receivable upon the conversion of such share or shares
of Preferred Stock, such shares of stock, securities or assets as may be issued
or payable with respect to or in exchange for a number of outstanding shares of
such Class B Stock equal to the number of shares of such Class B Stock
immediately theretofore receivable upon such conversion had such reorganization
or reclassification not taken place, and in any such case appropriate provisions
shall be made with respect to the rights and interests of such holder to the end
that the provisions hereof (including without limitation provisions for
adjustments of the Conversion Price) shall thereafter be applicable, as nearly
as may be, in relation to any shares of stock, securities or assets thereafter
deliverable upon the exercise of such conversion rights.

     5H.  Notice of Adjustment.  Upon any adjustment of the Conversion Price of
          --------------------                                                 
a series of Preferred Stock, then and in each such case the Corporation shall
give written notice thereof, by delivery in person, certified or registered
mail, return receipt requested, telecopier or telex, addressed to each holder of
shares of Preferred Stock affected by such adjustment at the address of such
holder as shown on the books of the Corporation, which notice shall state the
Conversion Price resulting from such adjustment, setting forth in reasonable
detail the method upon which such calculation is based.

                                      12
<PAGE>
 
     5I.  Other Notices.  In case at any time:
          -------------                       

     (1)  the Corporation shall declare any dividend upon its Common Stock
payable in cash or stock or make any other distribution to the holders of its
Common Stock;

     (2)  the Corporation shall offer for subscription pro rata to the holders
of its Common Stock any additional shares of stock of any class or other rights;

     (3)  there shall be any capital reorganization or reclassification of the
capital stock of the Corporation, or a consolidation or merger of the
Corporation with or into another entity or entities, or a sale, lease,
abandonment, transfer or other disposition of all or substantially all its
assets; or

     (4)  there shall be a voluntary or involuntary dissolution, liquidation or
winding up of the Corporation;

then, in any one or more of said cases, the Corporation shall give, by delivery
in person, certified or registered mail, return receipt requested, telecopier or
telex, addressed to each holder of any shares of Preferred Stock at the address
of such holder as shown on the books of the Corporation, (a) at least 20 days'
prior written notice of the date on which the books of the Corporation shall
close or a record shall be taken for such dividend, distribution or subscription
rights or for determining rights to vote in respect of any such reorganization,
reclassification, consolidation, merger, disposition, dissolution, liquidation
or winding up and (b) in the case of any such reorganization, reclassification,
consolidation, merger, disposition, dissolution, liquidation or winding up, at
least 20 days' prior written notice of the date when the same shall take place.
Such notice in accordance with the foregoing clause (a) shall also specify, in
the case of any such dividend, distribution or subscription rights, the date on
which the holders of Common Stock shall be entitled thereto and such notice in
accordance with the foregoing clause (b) shall also specify the date on which
the holders of Common Stock shall be entitled to exchange their Common Stock for
securities or other property deliverable upon such reorganization,
reclassification, consolidation, merger, disposition, dissolution, liquidation
or winding up, as the case may be.

     5J.  Stock to be Reserved. The Corporation will at all times reserve and
          --------------------                                               
keep available out of its authorized Class B Stock, solely for the purpose of
issuance upon the conversion of Preferred Stock as herein provided, such number
of shares of Class B Stock as shall then be issuable upon the conversion of all
outstanding shares of Preferred Stock and Class A Stock. The Corporation
covenants that all shares of Class B Stock which shall be so issued shall be
duly and validly issued and fully paid and nonassessable and free from all
taxes, liens and charges with respect to the issue thereof, and, without
limiting the generality of the foregoing, the Corporation covenants that it will
from time to time take all such action as may be requisite to assure that the
par value per share of the Class B Stock is at all times equal to or less than
the lowest Conversion Price in effect at the time. The Corporation will take all
such action as may be necessary to assure that all such shares of Class B Stock
may be so issued without violation of any applicable law or regulation, or of
any requirement of any national securities exchange upon which the Class B Stock
may be listed. The Corporation will not take any action which results in any
adjustment of any Conversion Price if the total number of shares of Class B
Stock issued and issuable after such action upon conversion of all outstanding
shares of Preferred Stock and

                                      13
<PAGE>
 
Class A Stock would exceed the total number of shares of Class B Stock then
authorized by the Certificate of Incorporation.

     5K.  No Reissuance of Preferred Stock. Shares of Preferred Stock which are
          --------------------------------                                     
converted into shares of Class B Stock as provided herein shall not be reissued.

     5L.  Issue Tax. The issuance of certificates for shares of Class B Stock
          ---------                                                          
upon conversion of Preferred Stock shall be made without charge to the holders
thereof for any issuance tax in respect thereof, provided that the Corporation
shall not be required to pay any tax which may be payable in respect of any
transfer involved in the issuance and delivery of any certificate in a name
other than that of the holder of the Preferred Stock which is being converted.

     5M.  Closing of Books. The Corporation will at no time close its transfer
          ----------------                                                    
books against the transfer of any Preferred Stock or of any shares of Class B
Stock issued or issuable upon the conversion of any shares of Preferred Stock in
any manner which interferes with the timely conversion of such Preferred Stock,
except as may otherwise be required to comply with applicable securities laws.

     5N.  Definition of Common Stock. As used in this paragraph 5 and Section 7,
          --------------------------                                            
the term "Common Stock" shall mean and include the Corporation's authorized
Class A Common Stock, par value $.01 per share, and the Corporation's authorized
Class B Common Stock, par value $.01 per share, as constituted on the date of
filing of these terms of the Preferred Stock, and shall also include any capital
stock of any class of the Corporation thereafter authorized which shall not be
limited to a fixed sum or percentage in respect of the rights of the holders
thereof to participate in dividends or in the distribution of assets upon the
voluntary or involuntary liquidation, dissolution or winding up of the
Corporation; provided that the shares of Class B Stock receivable upon
conversion of shares of Preferred Stock shall include only shares designated as
Class B Stock of the Corporation on the date of filing of this instrument, or in
case of any reorganization or reclassification of the outstanding shares
thereof, the stock, securities or assets provided for in subparagraph 5G of this
Section II.

     5O.  Mandatory Conversion. If at any time the Corporation shall effect a
          --------------------                                               
firm commitment underwritten public offering of shares of Common Stock in which
(i) the aggregate net proceeds to the Corporation after deducting underwriters
commissions and discounts shall be at least $30,000,000 and (ii) the price paid
by the public for such shares shall be at least $100 per share (appropriately
adjusted to reflect the occurrence of any event described in subparagraph 5F),
then effective upon the closing of the sale of such shares by the Corporation
pursuant to such public offering, all outstanding shares of Preferred Stock
shall automatically convert to shares of Class B Stock on the basis set forth in
this paragraph 5. Holders of shares of Preferred Stock so converted may deliver
to the Corporation at its principal office (or such other office or agency of
the Corporation as the Corporation may designate by notice in writing to such
holders) during its usual business hours, the certificate or certificates for
the shares so converted. As promptly as practicable thereafter, the Corporation
shall issue and deliver to such holder a certificate or certificates for the
number of whole shares of Class B Stock to which such holder is entitled,
together with any cash dividends and payment in lieu of fractional shares to
which such holder may be entitled pursuant to subparagraph 5C. Until such time
as a holder of shares of Preferred Stock shall surrender his or its certificates
therefor as provided above, such certificates shall be 

                                      14
<PAGE>
 
deemed to represent the shares of Class B Stock to which such holder shall be
entitled upon the surrender thereof.

     6A.  Mandatory Redemption.  On or after December 31, 2001, the Corporation
          --------------------                                                 
shall redeem from each holder of shares of Preferred Stock, at such holder's
option, all of the shares of Preferred Stock held by such holder on the
applicable Series A Redemption Date, Series B Redemption Date or Series C
Redemption Date (each as defined below).

     6B.  Redemption Price and Payment. The Series A Convertible Preferred Stock
          ----------------------------                                          
to be redeemed on the Series A Redemption Date shall be redeemed by paying for
each share in cash an amount equal to $6.00 per share (subject to adjustment for
stock splits, stock dividends, reorganizations, reclassification or other
similar events) plus, in the case of each share, an amount equal to all
dividends declared but unpaid thereon, computed to the Series A Redemption Date,
such amount being referred to as the "Series A Redemption Price". Such payment
shall be made in full on the Series A Redemption Date to the holders entitled
thereto.  The Series B Convertible Preferred Stock to be redeemed on the Series
B Redemption Date shall be redeemed by paying for each share in cash an amount
equal to $12.00 per share (subject to adjustment for stock splits, stock
dividends, reorganizations, reclassification or other similar events) plus, in
the case of each share, an amount equal to all dividends declared but unpaid
thereon, computed to the Series B Redemption Date, such amount being referred to
as the "Series B Redemption Price". Such payment shall be made in full on the
Series B Redemption Date to the holders entitled thereto.  The Series C
Convertible Preferred Stock to be redeemed on the Series C Redemption Date shall
be redeemed by paying for each share in cash an amount equal to $21.00 per share
(subject to adjustment for stock splits, stock dividends, reorganizations,
reclassification or other similar events) plus, in the case of each share, an
amount equal to all dividends declared but unpaid thereon, computed to the
Series C Redemption Date, such amount being referred to as the "Series C
Redemption Price". Such payment shall be made in full on the Series C Redemption
Date to the holders entitled thereto.

     6C.  Redemption Mechanics. Any holder of Preferred Stock desiring to
          --------------------                                           
exercise its option under Paragraph 6A shall provide written notice (such notice
being referred to as the "Series A Redemption Notice", "Series B Redemption
Notice" or "Series C Redemption Notice" as applicable, and generally as a
"Redemption Notice") to the Corporation indicating (a) the number and
designation of shares of Preferred Stock held by such holder and (b) the date on
which such redemption shall take place (the "Series A Redemption Date", "Series
B Redemption Date" or "Series C Redemption Date", as applicable), which date
shall not be less than 45 days from the date the applicable Redemption Notice is
delivered to the Corporation by delivery in person, certified or registered
mail, return receipt requested, telecopier or telex. Within five (5) days of
receipt of any Redemption Notice, the Corporation shall send written notice to
all other holders of record of shares of Series A Convertible Preferred Stock,
Series B Convertible Preferred Stock, or Series C Convertible Preferred Stock,
as applicable, of the receipt (and the contents) of such Redemption Notice. Any
such holder may, by delivery of a Redemption Notice within thirty (30) days of
receipt of such notice from the Corporation, elect to have all of its shares of
Series A Convertible Preferred Stock, Series B Convertible Preferred Stock or
Series C Convertible Preferred Stock, as applicable, redeemed on the date
indicated in the Series A Redemption Notice, Series B Redemption Notice or
Series C Redemption Notice previously received by the Corporation. The Series A
Redemption Price, Series B Redemption Price or Series C Redemption Price, as
applicable, shall be payable to each holder at it or his address as

                                      15
<PAGE>
 
shown by the records of the Corporation. From and after the close of business on
the applicable Redemption Date, unless there shall have been a default in the
payment of the Series A Redemption Price, Series B Redemption Price or Series C
Redemption Price, as applicable, all rights of holders of shares of Preferred
Stock requesting redemption (except the right to receive the Series A Redemption
Price, Series B Redemption Price or Series C Redemption Price, as applicable)
shall cease with respect to such shares, and such shares shall not thereafter be
transferred on the books of the Corporation or be deemed to be outstanding for
any purpose whatsoever. If the funds of the Corporation legally available for
redemption of shares of Series B Convertible Preferred Stock on any Series B
Redemption Date and Series C Convertible Preferred Stock on any Series C
Redemption Date are insufficient to redeem the total number of outstanding
shares of Series B Convertible Preferred Stock and Series C Convertible
Preferred Stock on such dates, the holders of shares of Series B Convertible
Preferred Stock for which the Corporation has received a Series B Redemption
Notice and Series C Convertible Preferred Stock for which the Corporation has
received a Series C Redemption Notice shall share ratably in any funds legally
available for redemption of such shares according to the respective amounts
which would be payable with respect to the full number of shares owned by them
if all such outstanding shares were redeemed in full. The shares of Series B
Convertible Preferred Stock and Series C Convertible Preferred Stock not
redeemed shall remain outstanding and entitled to all rights and preferences
provided herein. At any time thereafter when additional funds of the Corporation
are legally available for the redemption of such shares of Series B Convertible
Preferred Stock and Series C Convertible Preferred Stock, such funds will be
used, at the end of the next succeeding fiscal quarter, to redeem the balance of
such shares, or such portion thereof for which funds are then legally available,
on the basis set forth above.  If the funds of the Corporation legally available
for redemption of shares of Series A Convertible Preferred Stock on any Series A
Redemption Date are insufficient to redeem the total number of outstanding
shares of Series A Convertible Preferred Stock, the holders of shares of Series
A Convertible Preferred Stock for which the Corporation has received a Series A
Redemption Notice shall share ratably in any funds legally available for
redemption of such shares according to the respective amounts which would be
payable with respect to the full number of shares owned by them if all such
outstanding shares were redeemed in full. The shares of Series A Convertible
Preferred Stock not redeemed shall remain outstanding and entitled to all rights
and preferences provided herein. At any time thereafter when additional funds of
the Corporation are legally available for the redemption of such shares of
Series A Convertible Preferred Stock, such funds will be used, at the end of the
next succeeding fiscal quarter, to redeem the balance of such shares, or such
portion thereof for which funds are then legally available, on the basis set
forth above.

     6D.  Redeemed or Otherwise Acquired Shares to be Retired. Any shares of
          ---------------------------------------------------               
Preferred Stock redeemed pursuant to this paragraph 6 or otherwise acquired by
the Corporation in any manner whatsoever shall be canceled and shall not under
any circumstances be reissued; and the Corporation may from time to time take
such appropriate corporate action as may be necessary to reduce accordingly the
number of authorized shares of Preferred Stock.

     6E.  Priority of Redemption.  The Series B Convertible Preferred Stock and
          ----------------------                                               
Series C Convertible Preferred Stock have priority over the Series A Convertible
Preferred Stock with respect to the rights of redemption set forth in this
paragraph 6.  In the event the Corporation has insufficient funds to redeem all
of the Series B Convertible Preferred Stock at the then applicable Series B
Redemption Price and all of the Series C Convertible Preferred Stock at the then
applicable Series C Redemption Price, the Corporation shall not be permitted to
redeem, and the

                                      16
<PAGE>
 
holders of Series A Convertible Preferred Stock shall not be entitled to demand
redemption of, any shares of Series A Convertible Preferred Stock until such
time as the Corporation has redeemed all of the issued and outstanding Series B
Convertible Preferred Stock and Series C Convertible Preferred Stock as provided
for herein.

     6F.  Surrender of Certificates.  Each holder of shares of Preferred Stock
          -------------------------                                           
to be redeemed shall surrender the certificate(s) representing such shares to
the Corporation at the principal offices of the Corporation or such other place
as the Corporation may designate in writing on the applicable Redemption Date
and upon the payment of the full Redemption Price for such shares as set forth
in this Section 6 to the order of the person whose name appears on such
certificate(s), each surrendered certificate shall be canceled and retired.  In
the event some but not all of the shares of Preferred Stock represented by a
certificate(s) surrendered by a holder are being redeemed, the Corporation shall
execute and deliver to or on the order of the holder, at the expense of the
Corporation, a new certificate representing the number of shares of Preferred
Stock which were not redeemed.

     7.   Restrictions and Limitations.
          ---------------------------- 

     (a)  Corporate Actions: Amendments to Charter. The Corporation will not
          ----------------------------------------                          
amend its Certificate of Incorporation or take any other corporate action
without the approval by the holders of at least 66.67% of the then outstanding
shares of Preferred Stock (calculated on an "as converted" basis), voting or
consenting together (separately from any other class or series of capital stock
of the Corporation), if such amendment or corporate action would:

          (i)   adversely affect or significantly alter the rights (including
but not limited to rights to a liquidation preference, dividend rights, voting
rights, Board representation rights and conversion rights) of the holders of the
Preferred Stock; provided, however, that if such amendment or action would
adversely affect or significantly alter such rights of only one of such series
of Preferred Stock, then the holders of such series shall be entitled to approve
as aforesaid such amendment or action, voting or consenting separately as a
series;

          (ii)  create, authorize the creation of or obligate the Corporation to
authorize the creation of additional shares of Class A Stock or capital stock
senior to or on a parity with the Preferred Stock (or, in each case, securities
convertible into such shares), or increase the authorized amount of Preferred
Stock (or securities convertible into shares of Preferred Stock); or

          (iii) issue or grant any shares of Common Stock or of warrants,
options or other rights to purchase or acquire Common Stock except for the
issuance of shares of Common Stock upon the conversion of shares of Preferred
Stock pursuant to the terms hereof, the issuance of Series A Convertible
Preferred Stock upon conversion of the Convertible Notes, the grant of options
(and the issuance of Common Stock pursuant to the exercise thereof) to purchase
up to 300,000 shares pursuant to the 1995 Stock Option Plan of the Company, as
amended through the date hereof.

     (b)  Additional Limitations.  For so long as 25% of the aggregate number of
          ----------------------                                                
shares of Preferred Stock initially issued remain outstanding, the Corporation
will not, without the approval

                                      17
<PAGE>
 
of the holders of at least 66.67% of the then outstanding shares of Preferred
Stock (calculated on an "as converted" basis):

          (i)   issue any debt securities which are convertible into,
exchangeable for or otherwise entitle the holder to receive equity securities of
the Corporation, other than securities which are issued in connection with
borrowing by the Corporation from banks or other institutional lenders;

          (ii)  redeem, purchase or otherwise acquire for value (or pay into or
set aside a sinking fund for such purpose) any shares of Common Stock; or

          (iii) merge or consolidate with any other corporation or other
entity, if at least a majority of the voting power of the Corporation, or the
surviving corporation after such merger or consolidation, as the case may be,
would not be owned by the holders of the capital stock of the Corporation before
such merger or consolidation.

     8.   Amendments. No provision of the terms of the Preferred Stock may be
          ----------                                                         
amended, modified or waived without the written consent or affirmative vote of
the holders of at least 66.67% of the then outstanding shares of Preferred Stock
(calculated on an "as converted" basis); provided, however, that if such
amendment or action would adversely affect or significantly alter such rights of
only one of such series of Preferred Stock, then the holders of such series
shall be entitled to approve as aforesaid such amendment or action, voting or
consenting separately as a series.

     SECOND:  That said amendment has been consented to and authorized by all
the holders of the issued and outstanding capital stock of the Corporation by
written consent given in accordance with the provisions of Section 228 of the
General Corporation Law of the State of Delaware.

     THIRD:  That the aforesaid amendment was duly adopted in accordance with
the applicable provisions of Section 242 of the General Corporation Law of the
State of Delaware.

     IN WITNESS WHEREOF, said Corporation has caused this Certificate of
Amendment to be signed by Ted B. Miller, its Chief Executive Officer/President,
and attested by Kathy Glass Broussard, its Assistant Secretary, this the 19th
day of February, 1997, and by execution hereof does declare and certify that
this is the act and deed of the Corporation and the facts herein stated are
true.

                              /s/ TED B. MILLER
                              ------------------------------------------------
                              Ted B. Miller, Chief Executive Officer/President

                              /s/ KATHY GLASS BROUSSARD
                              ------------------------------------------------
                              Kathy Glass Broussard, Assistant Secretary

                                      18

<PAGE>
 
                                                                     Exhibit 3.4

                          CERTIFICATE OF AMENDMENT OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                           CASTLE TOWER HOLDING CORP.


     Castle Tower Holding Corp., a corporation organized and existing and by
virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), DOES HEREBY CERTIFY:

     FIRST:  That the Board of Directors of said Corporation by Unanimous
Written Consent, resolved that the Corporation amend Section II.2 (Preferred
Stock-Voting) of Article FOURTH (Capital Stock) of its Certificate of
Incorporation as on file with the Secretary of State of Delaware to read as set
forth below:
 
     "2.  Voting.
          ------ 

     2A.  General. Except as may be otherwise provided in these terms of the
          -------                                                           
Preferred Stock or by law, the Preferred Stock shall vote together with all
other classes and series of stock of the Corporation as a single class on all
actions to be taken by the stockholders of the Corporation. Each share of
Preferred Stock shall entitle the holder thereof to such number of votes per
share on each such action as shall equal the number of shares of Class B Stock
(including fractions of a share) into which each share of Preferred Stock is
then convertible.

     2B.  Board Size. The Corporation shall not, without the written consent or
          ----------                                                           
affirmative vote of the holders of at least two-thirds of the then outstanding
shares of Preferred Stock (calculated on an "as converted" basis) voting
together, consenting or voting (as the case may be) separately from all other
classes or series of capital stock, increase the maximum number of directors
constituting the Board of Directors to a number in excess of ten (10).

     2C.  Board Seats. The holders of the Preferred Stock voting together,
          -----------                                                     
separately from all other classes and series of capital stock of the Corporation
shall be entitled to elect six(6) directors of the Corporation. The holders of
the Class A Stock voting as a separate class, shall be entitled to elect two (2)
directors of the Corporation. The holders of the Preferred Stock and both
classes of Common Stock, voting together as a single class, shall be entitled to
elect two (2) directors of the Corporation (with each share of Preferred Stock
entitled to that number of votes per share on each such action as shall equal
the number of shares of Class B Stock (including fractions of a share) into
which each share of Preferred Stock is then convertible.) At any meeting (or in
a written consent in lieu thereof) held for the purpose of electing directors,
the presence in person or by proxy (or the written consent) of the holders of a
majority (calculated on an "as converted" basis) of the shares of Preferred
Stock then outstanding shall constitute a quorum of the Preferred Stock for the
election of directors to be elected solely by the holders of the Preferred Stock
or jointly by the holders of the Preferred Stock and the Common Stock.  A
vacancy in any directorship elected by the holders of the Preferred Stock shall
be filled only by vote or written consent of the holders of the Preferred Stock,
a vacancy in any directorship elected by the holders of the Class A Stock shall
be filled only by vote or written consent of the holders of the Class A Stock
and a vacancy in any directorship elected
jointly by the holders of 
<PAGE>
 
the Preferred Stock and the Common Stock shall be filled only by vote or written
consent of the holders of Preferred Stock and the Common Stock as provided
above."
 
     SECOND:  That said amendment has been consented to and authorized by all
the holders of the issued and outstanding capital stock of the Corporation by
written consent given in accordance with the provisions of Section 228 of the
General Corporation Law of the State of Delaware.

     THIRD:  That the aforesaid amendment was duly adopted in accordance with
the applicable provisions of Section 242 of the General Corporation Law of the
State of Delaware.

     IN WITNESS WHEREOF, said Corporation has caused this Certificate of
Amendment to be signed by Ted B. Miller, Jr., its Chief Executive
Officer/President, and attested by Kathy Glass Broussard, its Secretary, this
the 16th day of June, 1997, and by execution hereof does declare and certify
that this is the act and deed of the Corporation and the facts herein stated are
true.

                            /s/ Ted B. Miller, Jr.
                           -----------------------------------------------
                           Ted B. Miller, Jr., Chief Executive Officer/President

                            /s/ Kathy Glass Broussard
                           -----------------------------------------------
                           Kathy Glass Broussard, Secretary

                                       2

<PAGE>
 
                                                                   Exhibit 3.5


                          CERTIFICATE OF AMENDMENT OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                           CASTLE TOWER HOLDING CORP.


     Castle Tower Holding Corp., a corporation organized and existing and by
virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), DOES HEREBY CERTIFY:

     FIRST:  That the Board of Directors of said Corporation by Unanimous
Written Consent resolved that the Corporation amend Article FOURTH of its
Certificate of Incorporation as on file with the Secretary of State of Delaware
to read in its entirety as set forth below:

     FOURTH: The Corporation shall be authorized to issue 17,946,337 shares of
capital stock, which shall be divided into 208,313 shares of Class A Common
Stock, with a par value of one cent ($.01) per share (the "Class A Stock"),
11,302,796 shares of Class B Common Stock, with a par value of one cent ($.01)
per share (the "Class B Stock"), and 6,435,228 shares of Preferred Stock, with a
par value of one cent ($.01) per share (the "Preferred Stock").

     The following is a statement of the designations, preferences, voting
powers, qualifications, special or relative rights and privileges in respect of
the authorized capital stock of the Corporation.

I.   CLASS A COMMON STOCK AND CLASS B COMMON STOCK
     ---------------------------------------------

     1.   General.  Except as specifically set forth herein, the rights of the
          -------                                                             
holders of Class A Stock and Class B Stock shall be identical, and the Class A
Stock and Class B Stock shall be treated as a single class of Common Stock and
shall be referred to herein collectively as the "Common Stock." The voting,
dividend and liquidation rights of the holders of the Class A Stock and Class B
Stock are subject to and qualified by the rights of the holders of the Preferred
Stock.

     2.   Voting.  The holders of the Class B Stock are entitled to one vote for
          ------                                                                
each share held at all meetings of stockholders (and written actions in lieu of
meetings). The holders of Class A Stock are entitled to such number of votes per
share of Class A Stock as shall equal the number of shares of Class B Stock
(including fractions of a share) into which each share of Class A Stock is then
convertible. There shall be no cumulative voting.

     3.   Dividends.  Dividends may be declared and paid on the Class A Stock
          ---------                                                          
and Class B Stock from funds lawfully available therefor as and when determined
by the Board of Directors and subject to any preferential dividend rights of any
then outstanding Preferred Stock. Any dividend declared by the Board of
Directors shall be declared and paid upon the outstanding shares of Class A
Stock and Class B Stock in equal amounts per share (treating each share of Class
A Stock as being equal to the number of shares of Class B Stock (including
fractions of a share) into which each share of Class A Stock is then
convertible) and without preference or priority of either the Class A Stock or
the Class B Stock over the other, provided that dividends payable in stock of
the Corporation may be declared and paid on the Class A Stock in shares of Class
A Stock and on the Class B Stock in shares of Class B Stock.  Notwithstanding
the above,
<PAGE>
 
no dividends shall be declared or paid on Class A Stock or Class B Stock without
the approval of  at least 66.67% of the then outstanding shares of Senior
Convertible Preferred Stock held by stockholders of the Corporation which do not
hold any Series Preferred or Common Stock (other than upon exercise of Senior
Investor Warrants or conversion of Senior Convertible Preferred Stock)
("Required Senior Preferred Holders").

     4.   Liquidation. Dissolution or Winding Up. In the event of any voluntary
          --------------------------------------                               
or involuntary liquidation, dissolution or winding up on the Corporation, after
payment of all preferential amounts required to be paid to the holders of
Preferred Stock, the holders of shares of Class A Stock and Class B Stock then
outstanding shall share ratably in any distribution of the remaining assets and
funds of the Corporation in proportion to the respective amounts which would
otherwise be payable in respect of the shares held by them upon such
distribution if all amounts payable on or with respect to such shares were paid
in full. For this purpose, each share of Class A Stock shall be entitled to
receive the amount which would be payable to shares of Class B Stock issued on
conversion of such Class A Stock if such conversion had occurred immediately
prior to such distribution.

     5.   Conversion of Class A Stock.
          --------------------------- 

     5A.  Optional Conversion. Each share of Class A Stock shall be convertible,
          -------------------                                                   
at the option of the holder, at any time and from time to time, into 1.523148
shares of fully paid and nonassessable shares of Class B Stock ("Class A
Conversion Rate").

     5B.  Mandatory Conversion. The Corporation may, at its option, require all
          --------------------                                                 
(and not less than all) holders of shares of Class A Stock then outstanding to
convert their shares of Class A Stock into shares of Class B Stock, at the then
effective Class A Conversion Rate pursuant to Section 5A, simultaneously with
the conversion of outstanding shares of Preferred Stock pursuant to Section
II.5P. of this Article Fourth. All holders of record of shares of Class A Stock
will be given at least 10 days' prior written notice of the date fixed and the
place designated for mandatory conversion of all such shares of Class A Stock.
Such notice will be sent by first class or registered mail, postage prepaid, to
each record holder of Class A Stock at such holder's address last shown on the
records of the transfer agent for the Class A Stock (or the records of the
Corporation, if it serves as its own transfer agent). On or before the date
fixed for conversion, each holder of shares of Class A Stock shall surrender his
or its certificate or certificates for all such shares to the Corporation at the
place designated in such notice, and shall thereafter receive certificates for
the number of shares of Class B Stock to which such holder is entitled. On the
date fixed for conversion, all rights with respect to the Class A Stock so
converted, including the rights, if any, to receive notices and vote, will
terminate, except only the rights of the holders thereof, upon surrender of
their certificate or certificates thereof, to receive certificates for the
number of shares of Class B Stock into which such Class A Stock has been
converted. If so required by the Corporation, certificates surrendered for
conversion shall be endorsed or accompanied by written instrument or instruments
of transfer, in form reasonably satisfactory to the Corporation, duly executed
by the registered holder or by his or its attorney duly authorized in writing.
As promptly as practicable after the date of such mandatory conversion and the
surrender of the certificate or certificates for Class A Stock, the Corporation
shall cause to be issued and delivered to such holder, or on his or its written
order, a certificate or certificates for the number of full shares of Class B
Stock issuable on such conversion in accordance with the provisions hereof. All
certificates evidencing shares of Class A Stock which are required to be

                                       2
<PAGE>
 
surrendered for conversion in accordance with the provisions hereof shall, from
and after the date such certificates are so required to be surrendered, be
deemed to have been retired and canceled and the shares of Class A Stock
represented thereby converted into Class B Stock for all purposes,
notwithstanding the failure of the holder or holders thereof to surrender such
certificates on or prior to such date. The Corporation may thereafter take such
appropriate action as may be necessary to reduce the authorized Class A Stock
accordingly.

     5C.  Fractional Shares: Partial Conversion. No fractional shares shall be
          -------------------------------------                               
issued upon conversion of Class A Stock into Class B Stock.  In case the number
of shares of Class A Stock represented by the certificate or certificates
surrendered pursuant to subparagraph 5A exceeds the number of shares converted,
the Corporation shall, upon such conversion, execute and deliver to the holder,
at the expense of the Corporation, a new certificate or certificates for the
number of shares of Class A Stock represented by the certificate or certificates
surrendered which are not to be converted. If any fractional share of Class B
Stock would, except for the provisions of the first sentence of this
subparagraph 5D, be delivered upon such conversion, the Corporation, in lieu of
delivering such fractional share, shall pay to the holder surrendering the Class
A Stock for conversion an amount in cash equal to the current market price of
such fractional share as determined in good faith by the Board of Directors of
the Corporation without minority, marketability or similar discounts. In the
event of a liquidation of the Corporation, the aforesaid conversion rights shall
terminate at the close of business on the first full day preceding the date
fixed for the payment of any amounts distributable on liquidation to the holders
of Class A Stock. In order for a holder of Class A Stock to convert shares of
Class A Stock into shares of Class B Stock, such holder shall surrender the
certificate or certificates for such shares of Class A Stock, at the office of
the transfer agent for the Class A Stock (or at the principal office of the
Corporation if the Corporation serves as its own transfer agent), together with
written notice that such holder elects to convert all or any number of the
shares of Class A Stock represented by such certificate or certificates. Such
notice shall state such holder's name or the names of the nominees in which such
holder wishes the certificate or certificates for shares of Class B Stock to be
issued. If required by the Corporation, certificates surrendered for conversion
shall be endorsed or accompanied by a written instrument or instruments of
transfer, in form satisfactory to the Corporation, duly executed by the
registered holder or his or its attorney duly authorized in writing. The date of
receipt of such certificates and notice by the transfer agent (or by the
Corporation if the Corporation serves as its own transfer agent) shall be the
conversion date ("Class A Stock Conversion Date"). The Corporation shall, as
soon as practicable after the Class A Stock Conversion Date, issue and deliver
at such office to such holder of Class A Stock, or to his or its nominees, a
certificate or certificates for the number of shares of Class B Stock to which
such holder shall be entitled. The Corporation shall at all times when the Class
A Stock shall be outstanding, reserve and keep available out of its authorized
but unissued stock, for the purpose of effecting the conversion of the Class A
Stock, such number of its duly authorized shares of Class B Stock as shall from
time to time be sufficient to effect the conversion of all outstanding Class A
Stock. All shares of Class A Stock which shall have been surrendered for
conversion as herein provided shall no longer be deemed to be outstanding and
all rights with respect to such shares, including the rights, if any, to receive
notices and to vote, shall immediately cease and terminate on the Class A Stock
Conversion Date, except only the right of the holders thereof to receive shares
of Class B Stock in exchange therefor. Any shares of Class A Stock so converted
shall be retired and canceled and shall not be reissued, and the Corporation may
from time to time take such appropriate action as may be necessary to reduce the
authorized Class A Stock accordingly.

                                       3
<PAGE>
 
     5D.   Subdivision or Combination of Class B Stock.  In case the Corporation
           -------------------------------------------                          
shall at any time subdivide (by any stock split, stock dividend or otherwise)
its outstanding shares of Class B Stock into a greater number of shares, the
Class A Conversion Rate pursuant to Section 5A shall be proportionately
increased, and, conversely, in case the outstanding shares of Class B Stock
shall be combined into a smaller number of shares, the conversion rate shall be
proportionately reduced.

     5E.  Reorganization or Reclassification.  If any capital reorganization or
          ----------------------------------                                   
reclassification of the capital stock of the Corporation shall be effected in
such a way that holders of Class B Stock shall be entitled to receive stock,
securities or assets with respect to or in exchange for Class B Stock, then, as
a condition of such reorganization or reclassification, lawful and adequate
provisions shall be made whereby each holder of a share or shares of Class A
Stock shall thereupon have the right to receive, upon the basis and upon the
terms and conditions specified herein and in lieu of the shares of Class B Stock
immediately theretofore receivable upon the conversion of such share or shares
of Class A Stock, such shares of stock, securities or assets as may be issued or
payable with respect to or in exchange for a number of outstanding shares of
such Class B Stock equal to the number of shares of such Class B Stock
immediately theretofore receivable upon such conversion had such reorganization
or reclassification not taken place, and in any such case appropriate provisions
shall be made with respect to the rights and interests of such holder to the end
that the provisions hereof (including without limitation provisions for
adjustments of the Class A Conversion Rate) shall thereafter be applicable, as
nearly as may be, in relation to any shares of stock, securities or assets
thereafter deliverable upon the exercise of such conversion rights.

     5F.  Notice of Adjustment. Upon any adjustment of the Class A Conversion
          --------------------                                               
Rate, then and in each such case the Corporation shall give written notice
thereof, by delivery in person, certified or registered mail, return receipt
requested, telecopier or telex, addressed to each holder of shares of Class A
Stock at the address of such holder as shown on the books of the Corporation,
which notice shall state the conversion rate resulting from such adjustment,
setting forth in reasonable detail the method upon which such calculation is
based.

     5G.  Other Notices.  In case at any time:
          -------------                       

     (1)  the Corporation shall declare any dividend upon its Class B Stock
payable in cash or stock or make any other distribution to the holders of its
Class B Stock;

     (2)  the Corporation shall offer for subscription pro rata to the holders
of its Class B Stock any additional shares of stock of any class or other
rights;

     (3)  there shall be any capital reorganization or reclassification of the
capital stock of the Corporation, or a consolidation or merger of the
Corporation with or into another entity or entities, or a sale, lease,
abandonment, transfer or other disposition of all or substantially all its
assets; or

     (4) there shall be a voluntary or involuntary dissolution, liquidation or
winding up of the Corporation; then, in any one or more of said cases, the
Corporation shall give, by delivery in person, certified or registered mail,
return receipt requested, telecopier or telex, addressed to each holder of any
shares of Class A Stock at the address of such holder as shown on the books

                                       4
<PAGE>
 
of the Corporation, (a) at least 20 days' prior written notice of the date on
which the books of the Corporation shall close or a record shall be taken for
such dividend, distribution or subscription rights or for determining rights to
vote in respect of any such reorganization, reclassification, consolidation,
merger, disposition, dissolution, liquidation or winding up and (b) in the case
of any such reorganization, reclassification, consolidation, merger,
disposition, dissolution, liquidation or winding up, at least 20 days' prior
written notice of the date when the same shall take place. Such notice in
accordance with the foregoing clause (a) shall also specify, in the case of any
such dividend, distribution or subscription rights, the date on which the
holders of Class B Stock shall be entitled thereto and such notice in accordance
with the foregoing clause (b) shall also specify the date on which the holders
of Class B Stock shall be entitled to exchange their Class B Stock for
securities or other property deliverable upon such reorganization,
reclassification, consolidation, merger, disposition, dissolution, liquidation
or winding up, as the case may be.

     5H.  Stock to be Reserved.  The Corporation will at all times reserve and
          --------------------                                                
keep available out of its authorized Class B Stock, solely for the purpose of
issuance upon the conversion of Class A Stock as herein provided, such number of
shares of Class B Stock as shall then be issuable upon the conversion of all
outstanding shares of Class A Stock. The Corporation covenants that all shares
of Class B Stock which shall be so issued shall be duly and validly issued and
fully paid and nonassessable and free from all taxes, liens and charges with
respect to the issue thereof. The Corporation will take all such action as may
be necessary to assure that all such shares of Class B Stock may be so issued
without violation of any applicable law or regulation, or of any requirement of
any national securities exchange upon which the Class B Stock may be listed. The
Corporation will not take any action which results in any adjustment of the
Class A Conversion Rate if the total number of shares of Class B Stock issued
and issuable after such action upon conversion of the Class A Stock would exceed
the total number of shares of Class B Stock then authorized by the Certificate
of Incorporation.

     5I.  No Reissuance of Class A Stock. Shares of Class A Stock which are
          ------------------------------                                   
converted into shares of Class B Stock as provided herein shall not be reissued.

II.  PREFERRED STOCK
     ---------------

     1.   Designation. There shall be a series of Preferred Stock designated and
          -----------                                                           
known as "Series A Convertible Preferred Stock" consisting of 1,383,333 shares;
a series of Preferred Stock designated and known as "Series B Convertible
Preferred Stock" consisting of 864,568 shares; a series of Preferred Stock
designated and known as "Series C Convertible Preferred Stock" consisting of
3,529,832 shares; and a series of Preferred Stock designated and known as
"Senior Convertible Preferred Stock" consisting of  657,495 shares.

     2.   Voting.
          ------ 

     2A.  General. Except as may be otherwise provided in these terms of the
          -------                                                           
Preferred Stock or by law, the Preferred Stock shall vote together with all
other classes and series of stock of the Corporation as a single class on all
actions to be taken by the stockholders of the Corporation. Each share of
Preferred Stock shall entitle the holder thereof to such number of votes per
share on each such action as shall equal the number of shares of Class B Stock
(including fractions of a share) into which each share of Preferred Stock is
then convertible.

                                       5
<PAGE>
 
     2B.  Board Size. The Corporation shall not, without the written consent or
          ----------                                                           
affirmative vote of the holders of at least two-thirds of the then outstanding
shares of Preferred Stock (calculated on an "as converted" basis) voting
together, consenting or voting (as the case may be) separately from all other
classes or series of capital stock, increase the maximum number of directors
constituting the Board of Directors to a number in excess of eleven (11).

     2C.  Board Seats. The holders of the Preferred Stock voting together,
          -----------                                                     
separately from all other classes and series of capital stock of the Corporation
shall be entitled to elect five (5) directors of the Corporation. The holders of
the Class A Stock voting as a separate class, shall be entitled to elect one (1)
director of the Corporation. The holders of the Preferred Stock and both classes
of Common Stock, voting together as a single class, shall be entitled to elect
five (5) directors of the Corporation (with each share of Preferred Stock
entitled to that number of votes per share on each such action as shall equal
the number of shares of Class B Stock (including fractions of a share) into
which each share of Preferred Stock is then convertible).  At any meeting (or in
a written consent in lieu thereof) held for the purpose of electing directors,
the presence in person or by proxy (or the written consent) of the holders of a
majority (calculated on an "as converted" basis) of the shares of Preferred
Stock then outstanding shall constitute a quorum of the Preferred Stock for the
election of directors to be elected solely by the holders of the Preferred Stock
or jointly by the holders of the Preferred Stock and the Common Stock.  A
vacancy in any directorship elected by the holders of the Preferred Stock shall
be filled only by vote or written consent of the holders of the Preferred Stock,
a vacancy in any directorship elected by the holders of the Class A Stock shall
be filled only by vote or written consent of the holders of the Class A Stock
and a vacancy in any directorship elected jointly by the holders of the
Preferred Stock and the Common Stock shall be filled only by vote or written
consent of the holders of Preferred Stock and the Common Stock as provided
above.

     3.   Dividends.
          --------- 

     3A.  Senior Dividends.  The holders of the Shares of Senior Convertible
          ----------------                                                  
Preferred Stock shall be entitled to receive, out of funds legally available
therefore, and the Company shall be entitled to declare and pay annual cash
dividends at a compounded rate of 12.5% per share per annum (computed on the
basis of 30-day months and a 360-day year) from the date of original issue of
such shares based upon (i) $100.00 per share (subject to adjustment for stock
splits, stock dividends, reorganizations, reclassification or other similar
events) and (ii) accrued unpaid cumulative dividends.  Such annual cash
dividends shall be payable annually, when and if declared, on the anniversary
date of issuance, each such date being referred to herein as a "Dividend Payment
Date", commencing with the applicable anniversary date in 1998, to the holders
of record of shares of the Senior Convertible Preferred Stock as they appear on
the stock register of the Corporation on the applicable record date, not more
than 30 days nor less than 15 days preceding the applicable Dividend Payment
Date.  Any dividends accrued in respect of any Dividend Period (as defined
below) which are not paid in full in cash within 5 days after the applicable
Dividend Payment Date shall continue to accumulate and compound until payment,
which payment shall be effected only by the issuance of that number of
additional shares of Senior Convertible Preferred Stock which is equal to the
aggregate dividend arrearage in respect of such Dividend Period divided by $100
(subject to adjustment for stock splits, stock dividends, reorganizations,
reclassifications or other similar events).  "Dividend Period" means each 12-
month period commencing on the first day after the date of issuance in each year
and ending on and including the applicable Dividend Payment Date.  The amount of
dividends payable for any

                                       6
<PAGE>
 
period shorter or longer than a full 12 month Dividend Period shall be computed
on the basis of 30-day months and a 360-day year.  The dividends accrued on the
Senior Convertible Preferred Stock shall be cumulative until paid, and shall
accrue on a daily basis whether or not earned or declared and whether or not
there are profits, surplus or other funds of the Company legally available for
the payment of dividends.  The holders of the Senior Convertible Preferred Stock
shall not be entitled to any dividends other than the dividends provided in this
paragraph 3A of this Section III.  If any such accrued cumulative dividends on
the Senior Convertible Preferred Stock for any annual dividend period are not
declared and paid in cash, the deficiency shall first be paid in full before any
dividend or other distribution is paid or declared with respect to the Company's
capital stock (other than Senior Convertible Preferred Stock) now or hereinafter
outstanding.

     3B.  Series Convertible Preferred Stock.  The holders of the Series A
          ----------------------------------                              
Convertible Preferred Stock, Series B Convertible Preferred Stock or Series C
Convertible Stock ("Series Convertible Preferred Stock") shall be entitled to
receive, out of funds legally available therefore and subject to the senior
rights of holders of Senior Convertible Preferred Stock, and the Company shall
declare and pay dividends on the Series Convertible Preferred Stock at the same
rate as dividends (other than dividends payable in additional shares of Common
Stock) are declared and paid with respect to the Common Stock (treating each
share of Series Convertible Preferred Stock as being equal to the number of
shares of Common Stock (including fractions of a share) into which each share of
Series Convertible Preferred Stock is then convertible).  Notwithstanding the
above, no dividends shall be declared or paid on Series Convertible Preferred
Stock without the approval of the Required Senior Preferred Holders.

     3C.  Senior Preferred to be Reserved. The Corporation will at all times
          -------------------------------                                   
reserve and keep available out of its authorized Senior Convertible Preferred
Stock, solely for the purpose of issuance as dividends as provided in paragraph
3A of this Section III, such number of shares of Senior Convertible Preferred
Stock as shall then be issuable upon the distribution of such dividends. The
Corporation covenants that all shares of Senior Convertible Preferred Stock
which shall be so issued shall be duly and validly issued and fully paid and
nonassessable and free from all taxes, liens and charges with respect to the
issue thereof. The Corporation will take all such action as may be necessary to
assure that all such shares of Senior Convertible Preferred Stock may be so
issued without violation of any applicable law or regulation, or of any
requirement of any national securities exchange upon which the Senior
Convertible Preferred Stock may be listed.

     4.   Liquidation. Upon any liquidation, dissolution or winding up of the
          -----------                                                        
Corporation, whether voluntary or involuntary, before any distribution or
payment is made with respect to the Common Stock or any other series of capital
stock, holders of each share of Preferred Stock shall be entitled to be paid as
follows:  (A) to the holders of Series A Convertible Preferred Stock, an amount
equal to the greater of (i) $6.00 per share (subject to adjustment for stock
splits, stock dividends, reorganizations, reclassification or other similar
events) plus, in the case of each share, an amount equal to all dividends
declared but unpaid thereon, computed to the date payment thereof is made
available, or (ii) such amount per share as would have been payable had each
such share been converted to Common Stock pursuant to paragraph 5 of this
Section II immediately prior to such liquidation, dissolution or winding up, and
the holders of Series A Convertible Preferred Stock shall not be entitled to any
further payment, such amount payable with respect to one share of Series A
Convertible Preferred Stock being sometimes referred to

                                       7
<PAGE>
 
as the "Series A Liquidation Payment" and with respect to all shares of Series A
Convertible Preferred Stock being sometimes referred to as the "Series A
Liquidation Payments"; (B) to the holders of Series B Convertible Preferred
Stock, an amount equal to the greater of (i) $12.00 per share (subject to
adjustment for stock splits, stock dividends, reorganizations, reclassification
or other similar events) plus, in the case of each share, an amount equal to all
dividends declared but unpaid thereon, computed to the date payment thereof is
made available, or (ii) such amount per share as would have been payable had
each such share been converted to Common Stock pursuant to paragraph 5 of this
Section II immediately prior to such liquidation, dissolution or winding up, and
the holders of Series B Convertible Preferred Stock shall not be entitled to any
further payment, such amount payable with respect to one share of Series B
Convertible Preferred Stock being sometimes referred to as the "Series B
Liquidation Payment" and with respect to all shares of Series B Convertible
Preferred Stock being sometimes referred to as the "Series B Liquidation
Payments"; (C) to the holders of Series C Convertible Preferred Stock, an amount
equal to the greater of (i) $21.00 per share (subject to adjustment for stock
splits, stock dividends, reorganizations, reclassification or other similar
events) plus, in the case of each share, an amount equal to all dividends
declared but unpaid thereon, computed to the date payment thereof is made
available, or (ii) such amount per share as would have been payable had each
such share been converted to Common Stock pursuant to paragraph 5 of this
Section II immediately prior to such liquidation, dissolution or winding up, and
the holders of Series C Convertible Preferred Stock shall not be entitled to any
further payment, such amount payable with respect to one share of Series C
Convertible Preferred Stock being sometimes referred to as the "Series C
Liquidation Payment" and with respect to all shares of Series C Convertible
Preferred Stock being sometimes referred to as the "Series C Liquidation
Payments"; and (D) to the holders of Senior Convertible Preferred Stock, an
amount equal to the greater of (i) $100.00 per share (subject to adjustment for
stock splits, stock dividends, reorganizations, reclassification or other
similar events) plus, in the case of each share, accrued unpaid cumulative
dividends thereon and such additional incremental amount (taking into account
all dividends and other distributions relating to Senior Convertible Preferred
Stock) sufficient to produce an annualized cumulative internal rate of return of
18% based upon $100.00 per share (subject to adjustment for stock splits, stock
dividends, reorganization, reclassification or other similar events) and
computed to the date payment thereof is made available, or (ii) such amount per
share as would have been payable had each such share been converted to Common
Stock pursuant to paragraph 5 of this Section II immediately prior to such
liquidation, dissolution or winding up, and the holders of Senior Convertible
Preferred Stock shall not be entitled to any further payment, such amount
payable with respect to one share of Senior Convertible Preferred Stock being
sometimes referred to as the "Senior Liquidation Payment" and with respect to
all shares of Senior Convertible Preferred Stock being sometimes referred to as
the "Senior Liquidation Payments."  The Series A Liquidation Payments, Series B
Liquidation Payments, Series C Liquidation Payments and Senior Liquidation
Payments being sometimes generally referred to as the "Liquidation Payments".
The Senior Convertible Preferred Stock shall be senior in right of payment over
the Series Convertible Preferred Stock and the holders of Senior Convertible
Preferred Stock shall be paid all Senior Liquidation Payments  prior to the
payment of any Series A Liquidation Payments, Series B Liquidation Payments or
Series C Liquidation Payments.  The Series B Convertible Preferred Stock and
Series C Convertible Preferred Stock shall be in parity in right of payment
pursuant to this paragraph 4 and shall be senior in right of payment over the
Series A Convertible Preferred Stock and the holders of Series B Convertible
Preferred Stock and Series C Convertible Preferred Stock shall be paid,
respectively, all Series B Liquidation Payments and Series C Liquidation
Payments prior to the payment of any Series A Liquidation Payments.  If upon
such liquidation, dissolution or winding

                                       8
<PAGE>
 
up of the Corporation, whether voluntary or involuntary, the assets to be
distributed among the holders of Senior Convertible Preferred Stock shall be
insufficient to permit payment to the holders of Senior Convertible Preferred
Stock of the amount distributable as aforesaid, then the entire assets of the
Corporation available to be so distributed, if any, shall be distributed ratably
among the holders of Senior Convertible Preferred Stock.  If upon such
liquidation, dissolution or winding up of the Corporation, whether voluntary or
involuntary, the assets to be distributed among the holders of Series B
Convertible Preferred Stock and Series C Convertible Preferred Stock shall be
insufficient to permit payment to the holders of Series B Convertible Preferred
Stock and Series C Convertible Preferred Stock of the amount distributable as
aforesaid, then the entire assets of the Corporation to be so distributed shall
be distributed among the holders of the Series B Convertible Preferred Stock and
Series C Convertible Preferred Stock in proportion to the full undistributed
preferential Liquidation Payment that each holder of Series B Convertible
Preferred Stock and Series C Convertible Preferred Stock would otherwise be
entitled to receive in the manner and priority of distribution set forth above.
If upon such liquidation, dissolution or winding up of the Corporation, whether
voluntary or involuntary, the assets to be distributed among the holders of
Series A Convertible Preferred Stock shall be insufficient to permit payment to
the holders of Series A Convertible Preferred Stock of the amount distributable
as aforesaid, then the entire assets of the Corporation available to be so
distributed, if any, shall be distributed ratably among the holders of Series A
Convertible Preferred Stock. Upon any such liquidation, dissolution or winding
up of the Corporation, after the holders of Preferred Stock shall have been paid
in full the entire Liquidation Payments to which they shall be entitled, the
remaining net assets of the Corporation may be distributed to the holders of
stock ranking on liquidation junior to the Preferred Stock. Written notice of
such liquidation, dissolution or winding up, stating a payment date, the amount
of the Liquidation Payments and the place where said Liquidation Payments shall
be payable, shall be delivered in person, mailed by certified or registered
mail, return receipt requested, or sent by telecopier or telex, not less than 20
days prior to the payment date stated therein, to the holders of record of
Preferred Stock entitled to such Liquidation Payments, such notice to be
addressed to each such holder at its address as shown by the records of the
Corporation. The consolidation or merger of the Corporation into or with any
other entity or entities which results in the exchange of outstanding shares of
the Corporation for securities or other consideration issued or paid or caused
to be issued or paid by any such entity or affiliate thereof (other than a
merger to reincorporate the Corporation in a different jurisdiction or a merger,
reorganization or consolidation in which the Corporation is the surviving entity
and does not involve the transfer of more than 50% of the voting power of the
Corporation), and the sale, lease, abandonment, transfer or other disposition by
the Corporation of all or substantially all its assets, shall be deemed to be a
liquidation, dissolution or winding of the Corporation within the meaning of the
provisions of this paragraph 4.

     5.   Conversion.  The holders of shares of Preferred Stock shall have the
          ----------                                                          
following conversion rights:

     5A.  Optional Conversion.  Subject to the terms and conditions of this
          -------------------                                              
paragraph 5, the holder of any share or shares of Preferred Stock shall have the
right, at its option at any time, to convert any such shares of Preferred Stock
(except that upon any liquidation of the Corporation the right of conversion
shall terminate at the close of business on the business day fixed for payment
of the amount distributable on the Preferred Stock) into such number of fully
paid and nonassessable shares of Class B Stock as is obtained by (A) in the case
of Series A Convertible Preferred Stock (i) multiplying the number of shares of
Series A Convertible Preferred Stock so

                                       9
<PAGE>
 
to be converted by $6.00 and (ii) dividing the result by the conversion price of
$6.00 per share or, in case an adjustment of such price has taken place pursuant
to the further provisions of this paragraph 5, then by the conversion price as
last adjusted and in effect at the date any share or shares of Series A
Convertible Preferred Stock are surrendered for conversion (such price, or such
price as last adjusted, being referred to as the " Series A Conversion Price"),
(B) in the case of the Series B Convertible Preferred Stock (i) multiplying the
number of shares of Series B Convertible Preferred Stock so to be converted by
$12.00 and (ii) dividing the result by the conversion price of $12.00 per share
or, in case an adjustment of such price has taken place pursuant to the further
provisions of this paragraph 5, then by the conversion price as last adjusted
and in effect at the date any share or shares of Series B Convertible Preferred
Stock are surrendered for conversion (such price, or such price as last
adjusted, being referred to as the "Series B Conversion Price"), (C) in the case
of the Series C Convertible Preferred Stock (i) multiplying the number of shares
of Series C Convertible Preferred Stock so to be converted by $21.00 and (ii)
dividing the result by the conversion price of $21.00 per share or, in case an
adjustment of such price has taken place pursuant to the further provisions of
this paragraph 5, then by the conversion price as last adjusted and in effect at
the date any share or shares of Series C Convertible Preferred Stock are
surrendered for conversion (such price, or such price as last adjusted, being
referred to as the "Series C Conversion Price"; and (D) in the case of the
Senior Convertible Preferred Stock (i) multiplying the number of shares of
Senior Convertible Preferred Stock so to be converted by $100.00 plus, in the
case of each share, an amount equal to all accrued unpaid cumulative dividends
computed to the conversion date  and (ii) dividing the result by the conversion
price of $37.54 per share or, in case an adjustment of such price has taken
place pursuant to the further provisions of this paragraph 5, then by the
conversion price as last adjusted and in effect at the date any share or shares
of Senior Convertible Preferred Stock are surrendered for conversion (such
price, or such price as last adjusted, being referred to as the "Senior
Conversion Price."  The Series A Conversion Price, Series B Conversion Price,
Series C Conversion Price and Senior Conversion Price being generally referred
to as the "Conversion Price").  Such rights of conversion shall be exercised by
the holder thereof by giving written notice that the holder elects to convert a
stated number of shares of Preferred Stock into Class B Stock and by surrender
of a certificate or certificates for the shares so to be converted to the
Corporation at its principal office (or such other of office or agency of the
Corporation as the Corporation may designate by notice in writing to the holders
of the Preferred Stock) at any time during its usual business hours on the date
set forth in such notice, together with a statement of the name or names (with
address) in which the certificate or certificates for shares of Class B Stock
shall be issued.

     5B.  Issuance of Certificates: Time Conversion Effected.  Promptly after
          --------------------------------------------------                 
the receipt of the written notice referred to in subparagraph 5A and surrender
of the certificate or certificates for the share or shares of Preferred Stock to
be converted, the Corporation shall issue and deliver, or cause to be issued and
delivered, to the holder, registered in such name or names as such holder may
direct, a certificate or certificates for the number of whole shares of Class B
Stock issuable upon the conversion of such share or shares of Preferred Stock.
To the extent permitted by law, such conversion shall be deemed to have been
effected and the Conversion Price shall be determined as of the close of
business on the date on the date on which such written notice shall have been
received by the Corporation and the certificate or certificates for such share
or shares shall have been surrendered as aforesaid, and at such time the rights
of the holder of such share or shares of Preferred Stock shall cease, and the
person or persons in whose name or names

                                       10
<PAGE>
 
any certificate or certificates for shares of Class B Stock shall be issuable
upon such conversion shall be deemed to have become the holder or holders of
record of the shares represented thereby.

     5C.  Fractional Shares: Dividends: Partial Conversion.  No fractional
          ------------------------------------------------                
shares shall be issued upon conversion of Preferred Stock into Class B Stock and
no payment or adjustment shall be made upon any conversion on account of any
cash dividends on the Class B Stock issued upon such conversion. At the time of
each conversion, the Corporation shall pay in cash an amount equal to all
dividends, declared but unpaid on the shares of Series Convertible Preferred
Stock surrendered for conversion to the date upon which such conversion is
deemed to take place as provided in subparagraph 5B. In case the number of
shares of Preferred Stock represented by the certificate or certificates
surrendered pursuant to subparagraph 5A exceeds the number of shares converted,
the Corporation shall, upon such conversion, execute and deliver to the holder,
at the expense of the Corporation, a new certificate or certificates for the
number of shares of Preferred Stock represented by the certificate or
certificates surrendered which are not to be converted. If any fractional share
of Class B Stock would, except for the provisions of the first sentence of this
subparagraph 5C, be delivered upon such conversion, the Corporation, in lieu of
delivering such fractional share, shall pay to the holder surrendering the
Preferred Stock for conversion an amount in cash equal to the current market
price of such fractional share as determined in good faith by the Board of
Directors of the Corporation.

     5D.  Adjustment of Senior Conversion Price, Series A Conversion Price and
          --------------------------------------------------------------------
Series C Conversion Price Upon Issuance of Common Stock.  Except as provided in
- -------------------------------------------------------                        
subparagraph 5E, if and whenever the Corporation shall hereafter issue or sell,
or is, in accordance with subparagraphs 5D(1) through 5D(6), deemed to have
issued or sold, any shares of  Common Stock for a consideration per share less
than the Senior Conversion Price (Series C Conversion Price as to an adjustment
to the Series C Conversion Price or Series A Conversion Price as to an
adjustment to the Series A Conversion Price pursuant to this Section 5D) in
effect immediately prior to the time of such issue or sale, then, forthwith upon
such issue or sale, the Senior Conversion Price (Series C Conversion Price or
Series A Conversion Price, if applicable) shall be reduced to the price
determined by dividing (i) an amount equal to the sum of (a) the number of
shares of Common Stock outstanding immediately prior to such issue or sale
(determined on a fully diluted basis after giving effect to the conversion of
all Preferred Stock and to the exercise of all options and warrants which are
then exercisable) multiplied by the then existing Senior Conversion Price
(Series C Conversion Price or Series A Conversion Price, if applicable) and (b)
the consideration, if any, received by the Corporation upon such issue or sale,
by (ii) the total number of shares of Common Stock outstanding immediately after
such issue or sale (determined on a fully diluted basis after giving effect to
the conversion of all Preferred Stock and to the exercise of all options and
warrants which are then exercisable) .

     For purposes of this subparagraph 5D, the following subparagraphs 5D(1) to
5D(6) shall also be applicable:

     5D(1)   Issuance of Rights or Options.  In case at any time hereafter the
             -----------------------------                                    
Corporation shall in any manner grant (whether directly or by assumption in a
merger or otherwise) any warrants or other rights to subscribe for or to
purchase, or any options for the purchase of, Common Stock or any stock or
security convertible into or exchangeable for Common Stock (such warrants,
rights or options being called "Options" and such convertible or exchangeable
stock or securities being called "Convertible Securities") whether or not such
Options or the right to convert or

                                       11
<PAGE>
 
exchange any such Convertible Securities are immediately exercisable, and the
price per share for which Common Stock is issuable upon the exercise of such
Options or upon the conversion or exchange of such Convertible Securities
(determined by dividing (i) the total amount, if any, received or receivable by
the Corporation as consideration for the granting of such Options, plus the
minimum aggregate amount of additional consideration payable to the Corporation
upon the exercise of all such Options, plus, in the case of such Options which
relate to Convertible Securities, the minimum aggregate amount of additional
consideration, if any, payable upon the issue or sale of such Convertible
Securities and upon the conversion or exchange thereof, by (ii) the total
maximum number of shares of Common Stock issuable upon the exercise of such
Options or upon the conversion or exchange of all such Convertible Securities
issuable upon the exercise of such Options) shall be less than the Senior
Conversion Price, Series A Conversion Price or Series C Conversion Price, as
applicable, in effect immediately prior to the time of the granting of such
Options, then the total maximum number of shares of Common Stock issuable upon
the exercise of such Options or upon conversion or exchange of the total maximum
amount of such Convertible Securities issuable upon the exercise of such Options
shall be deemed to have been issued for such price per share as of the date of
granting of such Options or the issuance of such Convertible Securities and
thereafter shall be deemed to be outstanding.  Except as otherwise provided in
subparagraph 5D(3), no adjustment of the Senior Conversion Price, Series A
Conversion Price or Series C Conversion Price shall be made upon the actual
issue of such Common Stock or of such Convertible Securities upon exercise of
such Options or upon the actual issue of such Common Stock upon conversion or
exchange of such Convertible Securities.

     5D(2)   Issuance of Convertible Securities.  In case the Corporation shall
             ----------------------------------                                
hereafter in any manner issue (whether directly or by assumption in a merger or
otherwise) or sell any Convertible Securities, whether or not the rights to
exchange or convert any such Convertible Securities are immediately exercisable,
and the price per share for which Common Stock is issuable upon such conversion
or exchange (determined by dividing (i) the total amount received or receivable
by the Corporation as consideration for the issue or sale of such Convertible
Securities, plus the minimum aggregate amount of additional consideration, if
any, payable to the Corporation upon the conversion or exchange thereof, by (ii)
the total maximum number of shares of Common Stock issuable upon the conversion
or exchange of all such Convertible Securities) shall be less than the Senior
Conversion Price, Series A Conversion Price or Series C Conversion Price, as
applicable, in effect immediately prior to the time of such issue or sale, then
the total maximum number of shares of Common Stock issuable upon conversion or
exchange of all such Convertible Securities shall be deemed to have been issued
for such price per share as of the date of the issue or sale of such Convertible
Securities and thereafter shall be deemed to be outstanding, provided that (a)
except as otherwise provided in subparagraph 5D(3), no adjustment of the Senior
Conversion Price, Series A Conversion Price or Series C Conversion Price shall
be made upon the actual issue of such Common Stock upon conversion or exchange
of such Convertible Securities and (b) if any such issue or sale of such
Convertible Securities is made upon exercise of any Options to purchase any such
Convertible Securities for which adjustments of the Senior Conversion Price,
Series A Conversion Price or Series C Conversion Price have been or are to be
made pursuant to other provisions of this subparagraph 5D, no further adjustment
of the Senior Conversion Price, Series A Conversion Price or Series C Conversion
Price, as applicable, shall be made by reason of such issue or sale.

     5D(3)   Change in Option Price or Conversion Rate.  Upon the happening of
             -----------------------------------------                        
any of the following events, namely, if the purchase price provided for in any
Option referred to in

                                       12
<PAGE>
 
subparagraph 5D(1), the additional consideration, if any, payable upon the
conversion or exchange of any Convertible Securities referred to in subparagraph
5D(1) or 5D(2) or the rate at which Convertible Securities referred to in
subparagraph 5D(1) or 5D(2) are convertible into or exchangeable for Common
Stock shall change at any time (including, but not limited to, changes under or
by reason of provisions designed to protect against dilution), the Senior
Conversion Price, Series A Conversion Price and Series C Conversion Price, as
applicable, in effect at the time of such event shall forthwith be readjusted to
the Senior Conversion Price, Series A Conversion Price or Series C Conversion
Price, as applicable, which would have been in effect at such time had such
Options or Convertible Securities still outstanding provided for such changed
purchase price, additional consideration or conversion rate, as the case may be,
at the time initially granted, issued or sold, but only if as a result of such
adjustment the Senior Conversion Price, Series A Conversion Price or Series C
Conversion Price, as applicable, then in effect hereunder is thereby reduced;
and on the termination of any such Option or any such right to convert or
exchange such Convertible Securities, the Senior Conversion Price, Series A
Conversion Price and Series C Conversion Price, as applicable, then in effect
hereunder shall forthwith be increased to the Senior Conversion Price, Series A
Conversion Price or Series C Conversion Price, as applicable, which would have
been in effect at the time of such termination had such Option or Convertible
Securities, to the extent outstanding immediately prior to such termination,
never been issued.

     5D(4)   Consideration for Stock.  In case any shares of Common Stock,
             -----------------------                                      
Options or Convertible Securities shall be issued or sold for cash, the
consideration received therefor shall be deemed to be the amount received by the
Corporation therefor, without deduction therefrom of any expenses incurred or
any underwriting commissions or concessions paid or allowed by the Corporation
in connection therewith. In case any shares of Common Stock, Options or
Convertible Securities shall be issued or sold for a consideration other than
cash, the amount of the consideration other than cash received by the
Corporation shall be deemed to be the fair value of such consideration as
determined in good faith by the Board of Directors of the Corporation, without
deduction of any expenses incurred or any underwriting commissions or
concessions paid or allowed by the Corporation in connection therewith. In case
any Options shall be issued in connection with the issue and sale of other
securities of the Corporation, together comprising one integral transaction in
which no specific consideration is allocated to such Options by the parties
thereto, such Options shall be deemed to have been issued for such consideration
as determined in good faith by the Board of Directors of the Corporation.

     5D(5)   Record Date.  In case the Corporation shall take a record of the
             -----------                                                     
holders of its Common Stock for the purpose of entitling them (i) to receive a
dividend or other distribution payable in Common Stock, Options or Convertible
Securities or (ii) to subscribe for or purchase Common Stock, Options or
Convertible Securities, then such record date shall be deemed to be the date of
the issue or sale of the shares of Common Stock deemed to have been issued or
sold upon the declaration of such dividend or the making of such other
distribution or the date of the granting of such right of subscription or
purchase, as the case may be.

     5D(6)   Treasury Shares.  The number of shares of Common Stock outstanding
             ---------------                                                   
at any given time shall not include shares owned or held by or for the account
of the Corporation, and the disposition of any such shares shall be considered
an issue or sale of Common Stock for the purpose of this subparagraph 5D.

                                       13
<PAGE>
 
     5E.  Certain Issues of Common Stock Excepted.  Anything herein to the
          ---------------------------------------                         
contrary notwithstanding, the Corporation shall not be required to make any
adjustment of (1) the Senior Conversion Price issued upon a registered public
offering of Common Stock (except as set forth in paragraph 5H below) or (2) the
Senior Conversion Price, Series A Conversion Price or Series C Conversion Price
in the case of the issuance from and after the date of filing hereof of shares
of Class B Stock issued (a) upon the conversion of (i) shares of Preferred Stock
or (ii) shares of Class A Stock, (b) pursuant to the exercise of any warrants
for up to 262,998 shares of Class B Stock granted or issued in conjunction with
the issuance of Senior Convertible Preferred Stock, or (c) pursuant to the grant
or exercise of options under the 1995 Stock Option Plan of the Company or any
other employee/director stock option plan approved by the Board of Directors of
the Company and the holders of Preferred Stock pursuant to Section 7 hereof.

     5F.  Subdivision or Combination of Common Stock.  In case the Corporation
          ------------------------------------------                          
shall at any time subdivide (by any stock split, stock dividend or otherwise)
its outstanding shares of Common Stock into a greater number of shares, the
Conversion Price in effect immediately prior to such subdivision shall be
proportionately reduced, and, conversely, in case the outstanding shares of
Common Stock shall be combined into a smaller number of shares, the Conversion
Price in effect immediately prior to such combination shall be proportionately
increased.

     5G.  Reorganization or Reclassification.  If any capital reorganization or
          ----------------------------------                                   
reclassification of the capital stock of the Corporation shall be effected in
such a way that holders of Class B Stock shall be entitled to receive stock,
securities or assets with respect to or in exchange for Class B Stock, then, as
a condition of such reorganization or reclassification, lawful and adequate
provisions shall be made whereby each holder of a share or shares of Preferred
Stock shall thereupon have the right to receive, upon the basis and upon the
terms and conditions specified herein and in lieu of the shares of Class B Stock
immediately theretofore receivable upon the conversion of such share or shares
of Preferred Stock, such shares of stock, securities or assets as may be issued
or payable with respect to or in exchange for a number of outstanding shares of
such Class B Stock equal to the number of shares of such Class B Stock
immediately theretofore receivable upon such conversion had such reorganization
or reclassification not taken place, and in any such case appropriate provisions
shall be made with respect to the rights and interests of such holder to the end
that the provisions hereof (including without limitation provisions for
adjustments of the Conversion Price) shall thereafter be applicable, as nearly
as may be, in relation to any shares of stock, securities or assets thereafter
deliverable upon the exercise of such conversion rights.

     5H.  Public Offering.  Notwithstanding the above, if the Senior Convertible
          ---------------                                                       
Preferred Stock is converted to Class B Stock upon and subject to consummation
of the initial registered public offering of the Class B Stock and 85% of the
price per share of the Class B Common Stock to the public pursuant to the
initial registered public offering is less than the Senior Conversion Price
immediately prior to such offering, then the Senior Conversion Price as to the
Senior Convertible Preferred Stock converted upon the initial registered public
offering shall be 85% of the price per share to the public of the Class B Stock
included in such offering.

     5I.  Notice of Adjustment.  Upon any adjustment of the Conversion Price of
          --------------------                                                 
a series of Preferred Stock, then and in each such case the Corporation shall
give written notice thereof, by delivery in person, certified or registered
mail, return receipt requested, telecopier or telex, addressed to each holder of
shares of Preferred Stock affected by such adjustment at the address

                                       14
<PAGE>
 
of such holder as shown on the books of the Corporation, which notice shall
state the Conversion Price resulting from such adjustment, setting forth in
reasonable detail the method upon which such calculation is based.

     5J.  Other Notices.  In case at any time:
          -------------                       

     (1)  the Corporation shall declare any dividend upon its Common Stock
payable in cash or stock or make any other distribution to the holders of its
Common Stock;

     (2)  the Corporation shall offer for subscription pro rata to the holders
of its Common Stock any additional shares of stock of any class or other rights;

     (3)  there shall be any capital reorganization or reclassification of the
capital stock of the Corporation, or a consolidation or merger of the
Corporation with or into another entity or entities, or a sale, lease,
abandonment, transfer or other disposition of all or substantially all its
assets; or

     (4)  there shall be a voluntary or involuntary dissolution, liquidation or
winding up of the Corporation;

then, in any one or more of said cases, the Corporation shall give, by delivery
in person, certified or registered mail, return receipt requested, telecopier or
telex, addressed to each holder of any shares of Preferred Stock at the address
of such holder as shown on the books of the Corporation, (a) at least 20 days'
prior written notice of the date on which the books of the Corporation shall
close or a record shall be taken for such dividend, distribution or subscription
rights or for determining rights to vote in respect of any such reorganization,
reclassification, consolidation, merger, disposition, dissolution, liquidation
or winding up and (b) in the case of any such reorganization, reclassification,
consolidation, merger, disposition, dissolution, liquidation or winding up, at
least 20 days' prior written notice of the date when the same shall take place.
Such notice in accordance with the foregoing clause (a) shall also specify, in
the case of any such dividend, distribution or subscription rights, the date on
which the holders of Common Stock shall be entitled thereto and such notice in
accordance with the foregoing clause (b) shall also specify the date on which
the holders of Common Stock shall be entitled to exchange their Common Stock for
securities or other property deliverable upon such reorganization,
reclassification, consolidation, merger, disposition, dissolution, liquidation
or winding up, as the case may be.

     5K.  Stock to be Reserved. The Corporation will at all times reserve and
          --------------------                                               
keep available out of its authorized Class B Stock, solely for the purpose of
issuance upon the conversion of Preferred Stock as herein provided, such number
of shares of Class B Stock as shall then be issuable upon the conversion of all
outstanding shares of Preferred Stock and Class A Stock. The Corporation
covenants that all shares of Class B Stock which shall be so issued shall be
duly and validly issued and fully paid and nonassessable and free from all
taxes, liens and charges with respect to the issue thereof, and, without
limiting the generality of the foregoing, the Corporation covenants that it will
from time to time take all such action as may be requisite to assure that the
par value per share of the Class B Stock is at all times equal to or less than
the lowest Conversion Price in effect at the time. The Corporation will take all
such action as may be necessary to assure that all such shares of Class B Stock
may be so issued without violation of any applicable law or regulation, or of
any requirement of any national securities exchange upon

                                       15
<PAGE>
 
which the Class B Stock may be listed. The Corporation will not take any action
which results in any adjustment of any Conversion Price if the total number of
shares of Class B Stock issued and issuable after such action upon conversion of
all outstanding shares of Preferred Stock and Class A Stock would exceed the
total number of shares of Class B Stock then authorized by the Certificate of
Incorporation.

     5L.  No Reissuance of Preferred Stock. Shares of Preferred Stock which are
          --------------------------------                                     
converted into shares of Class B Stock as provided herein shall not be reissued.

     5M.  Issue Tax. The issuance of certificates for shares of Class B Stock
          ---------                                                          
upon conversion of Preferred Stock shall be made without charge to the holders
thereof for any issuance tax in respect thereof, provided that the Corporation
shall not be required to pay any tax which may be payable in respect of any
transfer involved in the issuance and delivery of any certificate in a name
other than that of the holder of the Preferred Stock which is being converted.

     5N.  Closing of Books. The Corporation will at no time close its transfer
          ----------------                                                    
books against the transfer of any Preferred Stock or of any shares of Class B
Stock issued or issuable upon the conversion of any shares of Preferred Stock in
any manner which interferes with the timely conversion of such Preferred Stock,
except as may otherwise be required to comply with applicable securities laws.

     5O.  Definition of Common Stock. As used in this paragraph 5 and Section 7,
          --------------------------                                            
the term "Common Stock" shall mean and include the Corporation's authorized
Class A Common Stock, par value $.01 per share, and the Corporation's authorized
Class B Common Stock, par value $.01 per share, as constituted on the date of
filing of these terms of the Preferred Stock, and shall also include any capital
stock of any class of the Corporation thereafter authorized which shall not be
limited to a fixed sum or percentage in respect of the rights of the holders
thereof to participate in dividends or in the distribution of assets upon the
voluntary or involuntary liquidation, dissolution or winding up of the
Corporation; provided that the shares of Class B Stock receivable upon
conversion of shares of Preferred Stock shall include only shares designated as
Class B Stock of the Corporation on the date of filing of this instrument, or in
case of any reorganization or reclassification of the outstanding shares
thereof, the stock, securities or assets provided for in subparagraph 5G of this
Section II.

     5P.  Mandatory Conversion. If at any time the Corporation shall effect a
          --------------------                                               
firm commitment underwritten public offering of shares of Common Stock in which
(i) the aggregate net proceeds to the Corporation after deducting underwriters
commissions and discounts shall be at least $30,000,000 and (ii) the price paid
by the public for such shares shall be at least $100 per share (appropriately
adjusted to reflect the occurrence of any event described in subparagraph 5F),
then effective upon the closing of the sale of such shares by the Corporation
pursuant to such public offering, all outstanding shares of Preferred Stock
shall automatically convert to shares of Class B Stock on the basis set forth in
this paragraph 5. Holders of shares of Preferred Stock so converted may deliver
to the Corporation at its principal office (or such other office or agency of
the Corporation as the Corporation may designate by notice in writing to such
holders) during its usual business hours, the certificate or certificates for
the shares so converted. As promptly as practicable thereafter, the Corporation
shall issue and deliver to such holder a certificate or certificates for the
number of whole shares of Class B Stock to which such holder is entitled,
together with any cash dividends and payment in lieu of fractional shares to
which such holder

                                       16
<PAGE>
 
may be entitled pursuant to subparagraph 5C. Until such time as a holder of
shares of Preferred Stock shall surrender his or its certificates therefor as
provided above, such certificates shall be deemed to represent the shares of
Class B Stock to which such holder shall be entitled upon the surrender thereof.
No provision contained in this subparagraph 5P may be amended, modified or
waived without the written consent or affirmative vote of the Required Senior
Preferred Holders.

     6.   Redemption.
          ---------- 

     6A.  Mandatory Redemption.  On or after the earlier of 91 days after the
          --------------------                                               
tenth anniversary date of the closing of the Corporation's high yield debt
offering of Senior Discount Notes issued pursuant to an SEC Form S-1
Registration Statement ("Discount Notes Closing") or May 15, 2008, the
Corporation shall redeem from each holder of shares of Preferred Stock, at such
holder's option, all of the shares of Preferred Stock held by such holder on the
applicable Senior Redemption Date, Series A Redemption Date, Series B Redemption
Date or Series C Redemption Date (each as defined below).

     6B.  Redemption Price and Payment. The Series A Convertible Preferred Stock
          ----------------------------                                          
to be redeemed on the Series A Redemption Date shall be redeemed by paying for
each share in cash an amount equal to $6.00 per share (subject to adjustment for
stock splits, stock dividends, reorganizations, reclassification or other
similar events) plus, in the case of each share, an amount equal to all
dividends declared but unpaid thereon, computed to the Series A Redemption Date,
such amount being referred to as the "Series A Redemption Price". Such payment
shall be made in full on the Series A Redemption Date to the holders entitled
thereto.  The Series B Convertible Preferred Stock to be redeemed on the Series
B Redemption Date shall be redeemed by paying for each share in cash an amount
equal to $12.00 per share (subject to adjustment for stock splits, stock
dividends, reorganizations, reclassification or other similar events) plus, in
the case of each share, an amount equal to all dividends declared but unpaid
thereon, computed to the Series B Redemption Date, such amount being referred to
as the "Series B Redemption Price". Such payment shall be made in full on the
Series B Redemption Date to the holders entitled thereto.  The Series C
Convertible Preferred Stock to be redeemed on the Series C Redemption Date shall
be redeemed by paying for each share in cash an amount equal to $21.00 per share
(subject to adjustment for stock splits, stock dividends, reorganizations,
reclassification or other similar events) plus, in the case of each share, an
amount equal to all dividends declared but unpaid thereon, computed to the
Series C Redemption Date, such amount being referred to as the "Series C
Redemption Price". Such payment shall be made in full on the Series C Redemption
Date to the holders entitled thereto.  The Senior Convertible Preferred Stock to
be redeemed on the Senior Redemption Date shall be redeemed by paying for each
share in cash an amount equal to $100.00 per share (subject to adjustment for
stock splits, stock dividends, reorganizations, reclassification or other
similar events) plus, in the case of each share, an amount equal to all accrued
unpaid cumulative dividends thereon, computed to the Senior Redemption Date,
such amount being referred to as the "Senior Redemption Price". Such payment
shall be made in full on the Senior Redemption Date to the holders entitled
thereto.

     6C.  Redemption Mechanics. Any holder of Preferred Stock desiring to
          --------------------                                           
exercise its option under Paragraph 6A shall provide written notice (such notice
being referred to as the "Senior Redemption Notice", "Series A Redemption
Notice", "Series B Redemption Notice" or "Series C Redemption Notice" as
applicable, and generally as a "Redemption Notice") to the

                                       17
<PAGE>
 
Corporation indicating (a) the number and designation of shares of Preferred
Stock held by such holder and (b) the date on which such redemption shall take
place (the "Senior Redemption Date", "Series A Redemption Date", "Series B
Redemption Date") or "Series C Redemption Date", as applicable), which date
shall not be less than 45 days from the date the applicable Redemption Notice is
delivered to the Corporation by delivery in person, certified or registered
mail, return receipt requested, telecopier or telex. Within five (5) days of
receipt of any Redemption Notice, the Corporation shall send written notice to
all other holders of record of shares of Senior Convertible Preferred Stock,
Series A Convertible Preferred Stock, Series B Convertible Preferred Stock, or
Series C Convertible Preferred Stock, as applicable, of the receipt (and the
contents) of such Redemption Notice. Any such holder may, by delivery of a
Redemption Notice within thirty (30) days of receipt of such notice from the
Corporation, elect to have all of its shares of Senior Convertible Preferred
Stock, Series A Convertible Preferred Stock, Series B Convertible Preferred
Stock or Series C Convertible Preferred Stock, as applicable, redeemed on the
date indicated in the Senior Redemption Notice, Series A Redemption Notice,
Series B Redemption Notice or Series C Redemption Notice previously received by
the Corporation. The Senior Redemption Price, Series A Redemption Price, Series
B Redemption Price or Series C Redemption Price, as applicable, shall be payable
to each holder at its or his address as shown by the records of the Corporation.
From and after the close of business on the applicable Redemption Date, unless
there shall have been a default in the payment of the Senior Redemption Price,
Series A Redemption Price, Series B Redemption Price or Series C Redemption
Price, as applicable, all rights of holders of shares of Preferred Stock
requesting redemption (except the right to receive the Senior Redemption Price,
Series A Redemption Price, Series B Redemption Price or Series C Redemption
Price, as applicable) shall cease with respect to such shares, and such shares
shall not thereafter be transferred on the books of the Corporation or be deemed
to be outstanding for any purpose whatsoever.  If the funds of the Corporation
legally available for redemption of shares of Senior Convertible Preferred Stock
on any Senior Redemption Date are insufficient to redeem the total number of
outstanding shares of Senior Convertible Preferred Stock, the holders of shares
of Senior Convertible Preferred Stock for which the Corporation has received a
Senior Redemption Notice shall share ratably in any funds legally available for
redemption of such shares according to the respective amounts which would be
payable with respect to the full number of shares owned by them if all such
outstanding shares were redeemed in full. The shares of Senior Convertible
Preferred Stock not redeemed shall remain outstanding and entitled to all rights
and preferences provided herein. At any time thereafter when additional funds of
the Corporation are legally available for the redemption of such shares of
Senior Convertible Preferred Stock, such funds will be used, at the end of the
next succeeding fiscal quarter, to redeem the balance of such shares, or such
portion thereof for which funds are then legally available, on the basis set
forth above.  If the funds of the Corporation legally available for redemption
of shares of Series B Convertible Preferred Stock on any Series B Redemption
Date and Series C Convertible Preferred Stock on any Series C Redemption Date
are insufficient to redeem the total number of outstanding shares of Series B
Convertible Preferred Stock and Series C Convertible Preferred Stock on such
dates, the holders of shares of Series B Convertible Preferred Stock for which
the Corporation has received a Series B Redemption Notice and Series C
Convertible Preferred Stock for which the Corporation has received a Series C
Redemption Notice shall share ratably in any funds legally available for
redemption of such shares according to the respective amounts which would be
payable with respect to the full number of shares owned by them if all such
outstanding shares were redeemed in full. The shares of Series B Convertible
Preferred Stock and Series C Convertible Preferred Stock not redeemed shall
remain outstanding and entitled to all rights and preferences provided

                                       18
<PAGE>
 
herein. At any time thereafter when additional funds of the Corporation are
legally available for the redemption of such shares of Series B Convertible
Preferred Stock and Series C Convertible Preferred Stock, such funds will be
used, at the end of the next succeeding fiscal quarter, to redeem the balance of
such shares, or such portion thereof for which funds are then legally available,
on the basis set forth above.  If the funds of the Corporation legally available
for redemption of shares of Series A Convertible Preferred Stock on any Series A
Redemption Date are insufficient to redeem the total number of outstanding
shares of Series A Convertible Preferred Stock, the holders of shares of Series
A Convertible Preferred Stock for which the Corporation has received a Series A
Redemption Notice shall share ratably in any funds legally available for
redemption of such shares according to the respective amounts which would be
payable with respect to the full number of shares owned by them if all such
outstanding shares were redeemed in full. The shares of Series A Convertible
Preferred Stock not redeemed shall remain outstanding and entitled to all rights
and preferences provided herein. At any time thereafter when additional funds of
the Corporation are legally available for the redemption of such shares of
Series A Convertible Preferred Stock, such funds will be used, at the end of the
next succeeding fiscal quarter, to redeem the balance of such shares, or such
portion thereof for which funds are then legally available, on the basis set
forth above.

     6D.  Redeemed or Otherwise Acquired Shares to be Retired. Any shares of
          ---------------------------------------------------               
Preferred Stock redeemed pursuant to this paragraph 6 or otherwise acquired by
the Corporation in any manner whatsoever shall be canceled and shall not under
any circumstances be reissued; and the Corporation may from time to time take
such appropriate corporate action as may be necessary to reduce accordingly the
number of authorized shares of Preferred Stock.

     6E.  Priority of Redemption.  The Senior Convertible Preferred Stock have
          ----------------------                                              
priority over the Series Convertible Preferred Stock with respect to the rights
of redemption set forth in this paragraph 6.  In the event the Corporation has
insufficient funds to redeem all of the Senior Convertible Preferred Stock at
the then applicable Senior Redemption Price, the Corporation shall not be
permitted to redeem, and the holders of Series Convertible Preferred Stock shall
not be entitled to demand redemption of, any shares of Series Convertible
Preferred Stock until such time as the Corporation has redeemed all of the
issued and outstanding Senior Convertible Preferred Stock as provided for
herein.  The Series B Convertible Preferred Stock and Series C Convertible
Preferred Stock have priority over the Series A Convertible Preferred Stock with
respect to the rights of redemption set forth in this paragraph 6.  In the event
the Corporation has insufficient funds to redeem all of the Series B Convertible
Preferred Stock at the then applicable Series B Redemption Price and all of the
Series C Convertible Preferred Stock at the then applicable Series C Redemption
Price, the Corporation shall not be permitted to redeem, and the holders of
Series A Convertible Preferred Stock shall not be entitled to demand redemption
of, any shares of Series A Convertible Preferred Stock until such time as the
Corporation has redeemed all of the issued and outstanding Series B Convertible
Preferred Stock and Series C Convertible Preferred Stock as provided for herein.

     6F.  Surrender of Certificates.  Each holder of shares of Preferred Stock
          -------------------------                                           
to be redeemed shall surrender the certificate(s) representing such shares to
the Corporation at the principal offices of the Corporation or such other place
as the Corporation may designate in writing on the applicable Redemption Date
and upon the payment of the full Redemption Price for such shares as set forth
in this Section 6 to the order of the person whose name appears on such
certificate(s), each surrendered certificate shall be canceled and retired.  In
the event some but not all of the

                                       19
<PAGE>
 
shares of Preferred Stock represented by a certificate(s) surrendered by a
holder are being redeemed, the Corporation shall execute and deliver to or on
the order of the holder, at the expense of the Corporation, a new certificate
representing the number of shares of Preferred Stock which were not redeemed.

     6G.  Senior Preferred Call.  At the option of the Corporation, the
          ---------------------                                        
Corporation may redeem on or before August 31, 1998, 50% (but not less than 50%)
of the outstanding Senior Convertible Preferred Stock at a price equal to
$100.00 per share (subject to adjustment for stock splits, stock dividends,
reorganizations, reclassifications or similar events) plus, in the case of each
share, accrued unpaid cumulative dividends thereon and such additional
incremental amount (taking into account all dividends and other distributions
relating to Senior Convertible Preferred Stock) sufficient to produce an
annualized cumulative internal rate of return of 18% based upon $100.00 per
share (subject to adjustment for stock splits, stock dividends, reorganizations,
reclassifications and similar events) and computed to the date of such
redemption.  Any redemption of Senior Convertible Preferred Stock pursuant to
this paragraph 6G shall be pro rata among the holders of Senior Convertible
Preferred Stock at such time, and such redemption shall be pro rata as to the
outstanding Senior Convertible Preferred Stock issued in August 1997 and October
1997.  Not less than 30 days prior to the date fixed for the redemption of the
Senior Convertible Preferred Stock, the Corporation shall send a written notice
to the holders of the Senior Convertible Preferred Stock specifying the date and
time of the redemption under this paragraph 6G by delivery in person, certified
or registered mail, return receipt requested, telecopier or telex.  After the
giving of any notice of Senior Convertible Preferred Stock redemption pursuant
to this paragraph 6G, the holders of shares of Senior Convertible Preferred
Stock may not convert such stock into Class B Stock of the Corporation in
accordance with the conversion privileges set forth in paragraph 5.  As of the
date and time fixed for the redemption (unless there has been a default in the
payment of the redemption payment pursuant to this paragraph 6G) of shares of
Senior Convertible Preferred Stock, the holders of the Senior Convertible
Preferred Stock shall cease to be stockholders with respect to such shares and
shall have no interest in or claims against the Corporation by virtue thereof
and shall have no voting or other rights with respect to such shares, except the
right to receive the moneys payable upon such redemption from the Corporation,
upon surrender (and endorsement, if required by the Corporation) of their
certificates, and the shares represented thereby shall no longer be deemed to be
outstanding.

     6H.  Senior Preferred Retirement.  On the earlier of 91 days after the
          ---------------------------                                      
Discount Notes Closing or May 15, 2008 (the "Maturity Date"), the Corporation
shall redeem all of the outstanding Senior Convertible Preferred Stock at a
price equal to $100.00 per share (subject to adjustment for stock splits, stock
dividends, reorganizations, reclassifications or similar events) plus, in the
case of each share, accrued unpaid cumulative dividends thereon. Not more than
75 days nor less than 30 days prior to the Maturity Date, the Corporation shall
send a written notice to the holders of the Senior Convertible Preferred Stock
giving notice of mandatory redemption on the Maturity Date by delivery in
person, certified or registered mail, return receipt requested, telecopier or
telex.  As of the Maturity Date, the holders of shares of  outstanding Senior
Convertible Preferred Stock may not convert such stock into Class B Stock of the
Corporation in accordance with the conversion privileges set forth in paragraph
5; provided, however, nothing in this subparagraph 6H shall impair or in any
manner restrict the right of  holders of Senior Convertible Preferred Stock to
exercise such conversion privileges at any time prior to the Maturity Date.
From and after the close of business on the Maturity Date (unless there has been

                                       20
<PAGE>
 
a default in the payment of the redemption price pursuant to this paragraph 6H),
the holders of the outstanding Senior Convertible Preferred Stock shall cease to
be stockholders with respect to such shares and shall have no interest in or
claims against the Corporation by virtue thereof and shall have no voting or
other rights with respect to such shares, except the right to receive the moneys
payable upon such redemption from the Corporation, upon surrender (and
endorsement, if required by the Corporation) of their certificates, and the
shares represented thereby shall no longer be deemed to be outstanding.
Further, if there is a liquidation, dissolution or winding up of the Corporation
after the Maturity Date (within the meaning of paragraph 4 of this Article II)
and prior to the 12-month anniversary date of the Maturity Date, then each
holder of Senior Convertible Preferred Stock as of the retirement date shall be
paid upon liquidation, dissolution or winding up an additional amount equal to
the amount such holder would have otherwise received upon liquidation,
dissolution or winding up of the Corporation if the Senior Convertible Preferred
Stock had not been retired on the Maturity Date reduced by the amount such
holder has otherwise been paid pursuant to this subparagraph 6H.  No provision
contained in this subparagraph 6H may be amended, modified or waived without the
written consent or affirmative vote of the Required Senior Preferred Holders.

     7.   Restrictions and Limitations.
          ---------------------------- 

     (a)  Corporate Actions: Amendments to Charter. The Corporation will not
          ----------------------------------------                          
amend its Certificate of Incorporation or take any other corporate action
without the approval by the holders of at least 66.67% of the then outstanding
shares of Preferred Stock (calculated on an "as converted" basis), voting or
consenting together (separately from any other class or series of capital stock
of the Corporation), if such amendment or corporate action would:

          (i)  adversely affect or significantly alter the rights (including but
not limited to rights to a liquidation preference, dividend rights, voting
rights, Board representation rights and conversion rights) of the holders of the
Preferred Stock (including any series of Preferred Stock); provided, however,
that if such amendment or action would adversely affect or significantly alter
such rights of only one of such series of Preferred Stock, then the holders of
at least 66.67% of such series (and the Required Senior Preferred Holders with
respect to the Senior Convertible Preferred Stock) must approve as aforesaid
such amendment or action, voting or consenting separately as a series;

          (ii)  create, authorize the creation of or obligate the Corporation to
authorize the creation of additional shares of Class A Stock or capital stock
senior to or on a parity with any of the Preferred Stock (or, in each case,
securities convertible into such shares), or increase the authorized amount of
Preferred Stock (or securities convertible into shares of Preferred Stock); or

          (iii)   issue or grant any shares of Common Stock or of warrants,
options or other rights to purchase or acquire Common Stock except for the
issuance of shares of Common Stock upon the conversion of shares of Preferred
Stock or Class A Stock pursuant to the terms hereof, the grant of options (and
the issuance of Common Stock pursuant to the exercise thereof) to purchase up to
1,153,000 shares pursuant to the 1995 Stock Option Plan of the Company, as
amended through the date hereof and the issuance of Common Stock pursuant to the
exercise of warrants for up to 262,998 shares of Class B Stock granted or issued
in conjunction with the issuance of Senior Convertible Preferred Stock.

                                       21
<PAGE>
 
     (b)  Additional Limitations.  For so long as 25% of the aggregate number of
          ----------------------                                                
shares of Preferred Stock initially issued remain outstanding, the Corporation
will not, without the approval of the holders of at least 66.67% of the then
outstanding shares of Preferred Stock (calculated on an "as converted" basis):

          (i)  issue any debt securities which are convertible into,
exchangeable for or otherwise entitle the holder to receive equity securities of
the Corporation, other than securities which are issued in connection with
borrowing by the Corporation from banks or other institutional lenders;

          (ii)  redeem, purchase or otherwise acquire for value (or pay into or
set aside a sinking fund for such purpose) any shares of Common Stock; or

          (iii)  merge or consolidate with any other corporation or other
entity, if at least a majority of the voting power of the Corporation, or the
surviving corporation after such merger or consolidation, as the case may be,
would not be owned by the holders of the capital stock of the Corporation before
such merger or consolidation.

     8.   Amendments. No provision of the terms of the Preferred Stock may be
          ----------                                                         
amended, modified or waived without the written consent or affirmative vote of
the holders of at least 66.67% of the then outstanding shares of Preferred Stock
(calculated on an "as converted" basis); provided, however, that if such
amendment or action would adversely affect or significantly alter such rights of
only one of such series of Preferred Stock, then the holders of at least 66.67%
of such series shall be entitled to approve as aforesaid such amendment or
action, voting or consenting separately as a series (and the Required Senior
Preferred Holders with respect to the Senior Convertible Preferred Stock).  A
separate class vote of the Senior Convertible Preferred Stock shall take into
account only the Senior Convertible Preferred Stock held by the Required Senior
Preferred Holders.

     SECOND:  That the Board of Directors of said Corporation by Unanimous
Written Consent resolved that the Corporation amend Article SIXTH of its
Certificate of Incorporation as on file with the Secretary of State of Delaware
to read in its entirety as set forth below:

     SIXTH. The number of directors of the Corporation shall at any time be
eleven (11). Elections of directors need not be by written ballot except and to
the extent provided in the by-laws of the Corporation.

     THIRD:  That said amendment has been consented to and authorized by all the
holders of the issued and outstanding capital stock of the Corporation by
written consent given in accordance with the provisions of Section 228 of the
General Corporation Law of the State of Delaware.

     FOURTH:  That the aforesaid amendment was duly adopted in accordance with
the applicable provisions of Section 242 of the General Corporation Law of the
State of Delaware.

                                       22
<PAGE>
 
     IN WITNESS WHEREOF, said Corporation has caused this Certificate of
Amendment to be signed by William E. Cordell, its Vice President, and
attested by Kathy Glass Broussard, its Secretary, this the 31st day of October,
1997, and by execution hereof does declare and certify that this is the act and
deed of the Corporation and the facts herein stated are true.


                                         William E. Cordell
                                 -----------------------------------------
                                 Name:   William E. Cordell
                                        ----------------------------------
                                 Title:  Vice President
                                        ----------------------------------
                                         Kathy Glass
                                 -----------------------------------------
                                 Kathy Glass Broussard,  Secretary


                                       23


<PAGE>
 
Exhibit 3.6


 
                                    BYLAWS

                                      OF

                          CASTLE TOWER HOLDING CORP.
                    (as amended through February 24, 1997)

                                   ARTICLE I

                                    OFFICES

     SECTION 1.1.  Registered Office.  The registered office of the corporation
                   -----------------                                           
in the State of Delaware shall be in 1013 Centre Road, Wilmington, DE 19805, and
the name of its registered agent shall be CSC Networks.

     SECTION 1.2.  Other Offices.  The corporation may also have offices at such
                   -------------                                                
other places both within and without the State of Delaware as the Board of
Directors may from time to time determine or the business of the corporation may
require.

                                   ARTICLE II

                            MEETINGS OF STOCKHOLDERS

     SECTION 2.1.  Place of Meeting.  All meetings of stockholders for the
                   ----------------                                       
election of directors shall be held at such place, either within or without the
State of Delaware, as shall be designated from time to time by the Board of
Directors and stated in the notice of the meeting.

     SECTION 2.2.  Annual Meeting.  The annual meeting of stockholders shall be
                   --------------                                              
held at such date and time as shall be designated from time to time by the Board
of Directors and stated in the notice of the meeting.

     SECTION 2.3.  Voting List.  The officer who has charge of the stock ledger
                   -----------                                                 
of the corporation shall prepare and make, at least ten days before every
meeting of stockholders, a complete list of the stockholders entitled to vote at
the meeting, arranged in alphabetical order, and showing the address of each
stockholder and the number of shares registered in the name of each stockholder.
Such list shall be open to the examination of any stockholder, for any purpose
<PAGE>
 
germane to the meeting, during ordinary business hours, for a period of at least
ten days prior to the meeting, either at a place within the city where the
meeting is to be held, which place shall be specified in the notice, or if not
so specified, at the place where the meeting is to be held.  The list shall also
be produced and kept at the time and place of the meeting during the whole time
thereof, and may be inspected by any stockholder who is present.

     SECTION 2.4.  Special Meeting.  Special meetings of the stockholders, for
                   ---------------                                            
any purpose or purposes, unless otherwise prescribed by statute or by the
Certificate of Incorporation, may be called by any two members of the Board of
Directors and shall be called by the President or the Secretary at the request
in writing of (i) stockholders owning a majority in amount of the entire capital
stock of the corporation issued and outstanding and entitled to vote, or (ii)
holders of at least 25% of the issued and outstanding shares of the
corporation's Class B Common Stock (assuming the conversion of all issued and
outstanding shares of Preferred Stock of the Company into Class B Common Stock
in accordance with the Certificate of Incorporation of the Company).  Such
request shall state the purposes of the proposed meeting.  The President or
directors so calling, or the stockholders so requesting, any such meeting shall
fix the time and any place, either within or without the State of Delaware, as
the place for holding such meeting.

     SECTION 2.5.  Notice of Meeting.  Written notice, in accordance with (S)222
                   -----------------                                            
of the Delaware General Corporation Law, of the annual meetings and each special
meeting of stockholders, stating the time, place and purpose or purposes
thereof, shall be given to each stockholder entitled to vote thereat, not less
than ten nor more than 60 days before the date of the meeting.

     SECTION 2.6.  Quorum.  The holders of a majority of the stock issued and
                   ------                                                    
outstanding and entitled to vote thereat, present in person or represented by
proxy, shall constitute a quorum at any meeting of stockholders for the
transaction of business except as otherwise

                                      -2-
<PAGE>
 
provided by statute or by the Certificate of Incorporation.  Notwithstanding the
other provisions of the Certificate of Incorporation or these Bylaws, the
holders of a majority of the shares of capital stock entitled to vote thereat,
present in person or represented by proxy, whether or not a quorum is present,
shall have power to adjourn the meeting.  If the adjournment is for more than 30
days, or if after the adjournment a new record date is fixed for the adjourned
meeting, a notice of the adjourned meeting shall be given to each stockholder of
record entitled to vote at the meeting.  At such adjourned meeting at which a
quorum shall be present or represented any business may be transacted which
might have been transacted at the meeting as originally notified.

     SECTION 2.7.  Voting.  When a quorum is present at any meeting of the
                   ------                                                 
stockholders, the vote of the holders of a majority of the stock having voting
power present in person or represented by proxy shall decide any question
brought before such meeting, unless the question is one upon which, by express
provisions of the statutes, of the Certificate of Incorporation or of these
Bylaws, a different vote is required, in which case such express provision shall
govern and control the decision of such question.  Every stockholder having the
right to vote shall be entitled to vote in person, or by proxy executed in
conformance with the requirements of (S) 212 of the Delaware General Corporation
Law, bearing a date not more than three years prior to voting, unless such
instrument provides for a longer period, and filed with the Secretary of the
corporation before, or at the time of, the meeting.  If such instrument shall
designate two or more persons to act as proxies, unless such instrument shall
provide the contrary, a majority of such persons present at any meeting at which
their powers thereunder are to be exercised shall have and may exercise all the
powers of voting or giving consents thereby conferred, or if only one be
present, then such powers may be exercised by that one; or, if an even number
attend and a majority do not agree on any particular issue, each proxy so
attending

                                      -3-
<PAGE>
 
shall be entitled to exercise such powers in respect of the same portion of the
shares as he is of the proxies representing such shares.

     SECTION 2.8.  Consent of Stockholders.  Whenever the vote of stockholders
                   -----------------------                                    
at a meeting thereof is required or permitted to be taken for or in connection
with any corporate action by any provision of the statutes, such action may be
taken without a meeting, without prior notice and without a vote, if a consent
or consents in writing, setting forth the action so taken shall be signed by the
holders of outstanding stock having not less than the minimum number of the
votes that would be necessary to authorize or take such action at a meeting at
which all shares entitled to vote thereon were present and voted, and provided
that prompt notice must be given to all stockholders who have not consented in
writing to the taking of the corporate action without a meeting and by less than
unanimous written consent.  Every written consent shall bear the date of
signature of each stockholder who signs the consent.

     SECTION 2.9.  Voting of Stock of Certain Holders.  Shares standing in the
                   ----------------------------------                         
name of another corporation, domestic or foreign, may be voted by such officer,
agent or proxy as the Bylaws of such corporation may prescribe, or in the
absence of such provision, as the Board of Directors of such corporation may
determine.  Shares standing in the name of a deceased person may be voted by the
executor or administrator of such deceased person, either in person or by proxy.
Shares standing in the name of a guardian, conservator or trustee may be voted
by such fiduciary, either in person or by proxy, but no such fiduciary shall be
entitled to vote shares held in such fiduciary capacity without a transfer of
such shares into the name of such fiduciary.  Shares standing in the name of a
receiver may be voted by such receiver.  A stockholder whose shares are pledged
shall be entitled to vote such shares, unless in the transfer by the pledgor on
the books of the corporation, he has expressly empowered the pledgee to vote
thereon, in which case only the pledgee, or his proxy, may represent the stock
and vote thereon.

                                      -4-
<PAGE>
 
     SECTION 2.10.  Treasury Stock.  The corporation shall not vote, directly or
                    --------------                                              
indirectly, shares of its own stock owned by it; and such shares shall not be
counted in determining the total number of outstanding shares.

     SECTION 2.11.  Fixing Record Date.  The Board of Directors may fix
                    ------------------                                 
in advance a date, which shall not be more than sixty nor less than ten days
before the date of any meeting of stockholders, or the date for payment of any
dividend or distribution, or the date for the allotment of rights, or the date
when any change, or conversion or exchange of capital stock shall go into
effect, or a date in connection with obtaining a consent, as a record date for
the determination of the stockholders entitled to notice of, and to vote at, any
such meeting and any adjournment thereof, or entitled to receive payment of any
such dividend or distribution, or to receive any such allotment of rights, or to
exercise the rights in respect of any such change, conversion or exchange of
capital stock, or to give such consent, and in such case such stockholders and
only such stockholders as shall be stockholders of record on the date so fixed
shall be entitled to such notice of, and to vote at, any such meeting and any
adjournment thereof, or to receive payment of such dividend or distribution, or
to receive such allotment of rights, or to exercise such rights, or to give such
consent, as the case may be, notwithstanding any transfer of any stock on the
books of the corporation after any such record date fixed as aforesaid.

                                  ARTICLE III

                               BOARD OF DIRECTORS

     SECTION 3.1.  Powers.  The business and affairs of the corporation shall be
                   ------                                                       
managed by its Board of Directors, which may exercise all such powers of the
corporation and do all such lawful acts and things as are not by statute or by
the Certificate of Incorporation or by these Bylaws directed or required to be
exercised or done by the stockholders.

                                      -5-
<PAGE>
 
     SECTION 3.2.  Number, Election and Term.  The number of directors which
                   -------------------------                                
shall constitute the whole Board shall be as set forth in the Certificate of
Incorporation.  The directors shall be elected at the annual meeting of
stockholders, except as provided in Section 3.3, and each director elected shall
hold office until his successor shall be elected and shall qualify.  Directors
need not be residents of Delaware or stockholders of the corporation.

     SECTION 3.3.  Vacancies, Additional Directors and Removal From Office.  If
                   -------------------------------------------------------     
any vacancy occurs in the Board of Directors caused by death, resignation,
retirement, disqualification or removal from office of any director, or
otherwise, or if any new directorship is created by an increase in the
authorized number of directors, a majority of the directors then in office,
though less than a quorum, or a sole remaining director, may choose a successor
or fill the newly created directorship; and a director so chosen shall hold
office until the next annual election and until his successor shall be duly
elected and shall qualify, unless sooner displaced.  Any director may be removed
either for or without cause at any special meeting of stockholders duly called
and held for such purpose.

     SECTION 3.4.  Regular Meeting.  A regular meeting of the Board of Directors
                   ---------------                                              
shall be held each year, without other notice than this by-law, at the place of,
and immediately following, the annual meeting of stockholders; and other regular
meetings of the Board of Directors shall be held each year, at such time and
place as the Board of Directors may provide, by resolution, either within or
without the State of Delaware, without other notice than such resolution.

     SECTION 3.5.  Special Meeting.  A special meeting of the Board of Directors
                   ---------------                                              
may be called by the Chairman of the Board or by the President and shall be
called by the Secretary on the written request of any two directors.  The
Chairman or President so calling, or the

                                      -6-
<PAGE>
 
directors so requesting, any such meeting shall fix the time and any place,
either within or without the State of Delaware, as the place for holding such
meeting.

     SECTION 3.6.  Notice of Special Meeting.  Written notice of special
                   -------------------------                            
meetings of the Board of Directors shall be given to each director at least 48
hours prior to the time of such meeting.  Any director may waive notice of any
meeting.  The attendance of a director at any meeting shall constitute a waiver
of notice of such meeting, except where a director attends a meeting for the
purpose of objecting to the transaction of any business because the meeting is
not lawfully called or convened.  Neither the business to be transacted at, nor
the purpose of, any special meeting of the Board of Directors need be specified
in the notice or waiver of notice of such meeting, except that notice shall be
given of any proposed amendment to the Bylaws if it is to be adopted at any
special meeting or with respect to any other matter where notice is required by
statute.

     SECTION 3.7.  Quorum.  A majority of the Board of Directors shall
                   ------                                             
constitute a quorum for the transaction of business at any meeting of the Board
of Directors, and the act of a majority of the directors present at any meeting
at which there is a quorum shall be the act of the Board of Directors, except as
may be otherwise specifically provided by statute, by the Certificate of
Incorporation or by these Bylaws.  If a quorum shall not be present at any
meeting of the Board of Directors, the directors present thereat may adjourn the
meeting from time to time, without notice other than announcement at the
meeting, until a quorum shall be present.

     SECTION 3.8.  Action Without Meeting.  Unless otherwise restricted by the
                   ----------------------                                     
Certificate of Incorporation or these Bylaws, any action required or permitted
to be taken at any meeting of the Board of Directors, or of any committee
thereof as provided in Article IV of these Bylaws, may be taken without a
meeting, if a written consent thereto is signed by all members

                                      -7-
<PAGE>
 
of the Board or of such committee, as the case may be, and such written consent
is filed with the minutes of proceedings of the Board or committee.

     SECTION 3.9.  Compensation.  Directors, as such, shall not be entitled to
                   ------------                                               
any stated salary for their services unless voted by the stockholders or the
Board of Directors; but by resolution of the Board of Directors, a fixed sum and
expenses of attendance, if any, may be allowed for attendance at each regular or
special meeting of the Board of Directors or any meeting of a committee of
directors.  No provision of these Bylaws shall be construed to preclude any
director from serving the corporation in any other capacity and receiving
compensation therefor.

                                   ARTICLE IV

                             COMMITTEE OF DIRECTORS

     SECTION 4.1.  Designation, Powers and Name.  The Board of Directors may, by
                   ----------------------------                                 
resolution passed by a majority of the whole Board, designate one or more
committees, including, if they shall so determine, an Executive Committee, each
such committee to consist of one or more of the directors of the corporation.
The committee shall have and may exercise such of the powers of the Board of
Directors in the management of the business and affairs of the corporation as
may be provided in such resolution.  The committee may authorize the seal of the
corporation to be affixed to all papers which may require it.  The Board of
Directors may designate one or more directors as alternate members of a
committee, who may replace any absent or disqualified member at any meeting of
such committee.  In the absence or disqualification of any member of such
committee or committees, the member or members thereof present at any meeting
and not disqualified from voting, whether or not he or they constitute a quorum,
may unanimously appoint another member of the Board of Directors to act at the
meeting in the place of any such absent or disqualified member.  Such committee
or committees shall have such name or names and such

                                      -8-
<PAGE>
 
limitations of authority as may be determined from time to time by resolution
adopted by the Board of Directors.

     SECTION 4.2.  Minutes.  Each committee of directors shall keep regular
                   -------                                                 
minutes of its proceedings and report the same to the Board of Directors when
required.

     SECTION 4.3.  Compensation.  Members of special or standing committees may
                   ------------                                                
be allowed compensation for attending committee meetings, if the Board of
Directors shall so determine.

                                   ARTICLE V

                                     NOTICE

     SECTION 5.1.  Methods of Giving Notice.  Whenever under the provisions of
                   ------------------------                                   
the statutes, the Certificate of Incorporation or these Bylaws, notice is
required to be given to any director, member of any committee or stockholder,
such notice shall be in writing and delivered personally, mailed or sent by
overnight courier to such director, member or stockholder; provided that in the
case of a director or a member of any committee such notice may be given orally
or by telephone or telecopy.  If mailed, notice to a director, member of a
committee or stockholder shall be deemed to be given when deposited in the
United States mail first class in a sealed envelope, with postage thereon
prepaid, addressed, in the case of a stockholder, to the stockholder at the
stockholder's address as it appears on the records of the corporation or, in the
case of a director or a member of a committee, to such person at his business
address.  If by a nationally recognized overnight courier service, notice to a
director, member of a committee or stockholder shall be deemed to be given when
deposited with such courier, addressed, in the case of a stockholder, to the
stockholder at the stockholder's address as it appears on the records of the
corporation or, in the case of a director or a member of a committee, to such
person at his business address.  If sent by telecopy, notice to a director or
member of a committee shall be

                                      -9-
<PAGE>
 
deemed to be given upon confirmation of the successful transmission thereof to
the designated telecopy number at the business address of such director or
member of a committee.

     SECTION 5.2.  Written Waiver.  Whenever any notice is required to be given
                   --------------                                              
under the provisions of the statutes, the Certificate of Incorporation or these
Bylaws, a waiver thereof in writing, signed by the person or persons entitled to
said notice, whether before or after the time stated therein, shall be deemed
equivalent thereto.

                                   ARTICLE VI

                                    OFFICERS

     SECTION 6.1.  Officers.  The officers of the corporation shall be a
                   --------                                             
Chairman of the Board and a Vice Chairman of the Board (if such offices are
created by the Board), a President, one or more Vice Presidents (any one or more
of which may be designated Executive Vice President or Senior Vice President), a
Secretary and a Treasurer.  The Board of Directors may by resolution create the
office of Vice Chairman of the Board and define the duties of such office.  The
Board of Directors may appoint such other officers and agents, including Chief
Executive Officer, Chief Financial Officer, Assistant Vice Presidents, Assistant
Secretaries and Assistant Treasurers, as it shall deem necessary, who shall hold
their offices for such terms and shall exercise such powers and perform such
duties as shall be determined by the Board.  Any two or more offices may be held
by the same person.  No officer shall execute, acknowledge, verify or
countersign any instrument on behalf of the corporation in more than one
capacity, if such instrument is required by law, by these Bylaws or by any act
of the corporation to be executed, acknowledged, verified or countersigned by
two or more officers.  The Chairman and Vice Chairman of the Board shall be
elected from among the directors.  With the foregoing exceptions, none of the
other officers need be a director, and none of the officers need be a
stockholder of the corporation.

                                     -10-
<PAGE>
 
     SECTION 6.2.  Election and Term of Office.  The officers of the corporation
                   ---------------------------                                  
shall be elected annually by the Board of Directors at its first regular meeting
held after the annual meeting of stockholders or as soon thereafter as
conveniently possible.  Each officer shall hold office until his successor shall
have been chosen and shall have qualified or until his death or the effective
date of his resignation or removal, or until he shall cease to be a director in
the case of the Chairman and Vice Chairman.

     SECTION 6.3.  Removal and Resignation.  Any officer or agent elected or
                   -----------------------                                  
appointed by the Board of Directors may be removed without cause by the
affirmative vote of a majority of the Board of Directors whenever, in its
judgment, the best interests of the corporation shall be served thereby, but
such removal shall be without prejudice to the contractual rights, if any, of
the person so removed.  Any officer may resign at any time by giving written
notice to the corporation.  Any such resignation shall take effect at the date
of the receipt of such notice or at any later time specified therein, and unless
otherwise specified therein, the acceptance of such resignation shall not be
necessary to make it effective.

     SECTION 6.4.  Vacancies.  Any vacancy occurring in any office of the
                   ---------                                             
corporation by death, resignation, removal or otherwise, may be filled by the
Board of Directors for the unexpired portion of the term.

     SECTION 6.5.  Salaries.  The salaries of all officers and agents of the
                   --------                                                 
corporation shall be fixed by the Board of Directors or pursuant to its
direction; and no officer shall be prevented from receiving such salary by
reason of his also being a director.

     SECTION 6.6.  Chairman of the Board.  The Chairman of the Board (if such
                   ---------------------                                     
office is created by the Board) shall preside at all meetings of the Board of
Directors or of the stockholders of the corporation.  In the Chairman's absence,
such duties shall be attended to by the Vice Chairman of the Board.  The
Chairman shall formulate and submit to the Board of

                                      -11-
<PAGE>
 
Directors or the Executive Committee matters of general policy for the
corporation and shall perform such other duties as usually appertain to the
office or as may be prescribed by the Board of Directors or the Executive
Committee.

     SECTION 6.7.  President.  The President shall be the chief executive
                   ---------                                             
officer of the corporation and, subject to the control of the Board of
Directors, shall in general supervise and control the business and affairs of
the corporation.  In the absence of the Chairman of the Board or the Vice
Chairman of the Board (if such offices are created by the Board), the President
shall preside at all meetings of the Board of Directors and of the stockholders.
He may also preside at any such meeting attended by the Chairman or Vice
Chairman of the Board if he is so designated by the Chairman, or in the
Chairman's absence by the Vice Chairman.  He shall have the power to appoint and
remove subordinate officers, agents and employees, except those elected or
appointed by the Board of Directors.  The President shall keep the Board of
Directors and the Executive Committee informed and shall consult them concerning
the business of the corporation.  He may sign with the Secretary or any other
officer of the corporation thereunto authorized by the Board of Directors,
certificates for shares of the corporation and any deeds, bonds, mortgages,
contracts, checks, notes, drafts or other instruments which the Board of
Directors has authorized to be executed, except in cases where the signing and
execution thereof has been expressly delegated by these Bylaws or by the Board
of Directors to some other officer or agent of the corporation, or shall be
required by law to be otherwise executed.  He shall vote, or give a proxy to any
other officer of the corporation to vote, all shares of stock of any other
corporation standing in the name of the corporation and in general he shall
perform all other duties normally incident to the office of President and such
other duties as may be prescribed by the stockholders, the Board of Directors or
the Executive Committee from time to time.

                                      -12-
<PAGE>
 
     SECTION 6.8.  Vice Presidents.  In the absence of the President, or in the
                   ---------------                                             
event of his inability or refusal to act, the Executive Vice President (or in
the event there shall be no Vice President designated Executive Vice President,
any Vice President designated by the Board) shall perform the duties and
exercise the powers of the President.  Any Vice President may sign, with the
Secretary or Assistant Secretary, certificates for shares of the corporation.
The Vice Presidents shall perform such other duties as from time to time may be
assigned to them by the President, the Board of Directors or the Executive
Committee.

     SECTION 6.9.  Secretary.  The Secretary shall (a) keep the minutes of the
                   ---------                                                  
meetings of the stockholders, the Board of Directors and committees of
directors; (b) see that all notices are duly given in accordance with the
provisions of these Bylaws and as required by law; (c) be custodian of the
corporate records and of the seal of the corporation, and see that the seal of
the corporation or a facsimile thereof is affixed to all certificates for shares
prior to the issue thereof and to all documents, the execution of which on
behalf of the corporation under its seal is duly authorized in accordance with
the provisions of these Bylaws; (d) keep or cause to be kept a register of the
post office address of each stockholder which shall be furnished by such
stockholder; (e) sign with the President, or an Executive Vice President or Vice
President, certificates for shares of the corporation, the issue of which shall
have been authorized by resolution of the Board of Directors; (f) have general
charge of the stock transfer books of the corporation; and (g) in general,
perform all duties normally incident to the office of Secretary and such other
duties as from time to time may be assigned to him by the President, the Board
of Directors or the Executive Committee.

     SECTION 6.10.  Treasurer.  If required by the Board of Directors, the
                    ---------                                             
Treasurer shall give a bond for the faithful discharge of his duties in such sum
and with such surety or sureties as the Board of Directors shall determine.  He
shall (a) have charge and custody of and be

                                      -13-
<PAGE>
 
responsible for all funds and securities of the corporation; receive and give
receipts for moneys due and payable to the corporation from any source
whatsoever and deposit all such moneys in the name of the corporation in such
banks, trust companies or other depositories as shall be selected in accordance
with the provisions of Section 7.3 of these Bylaws; (b) prepare, or cause to be
prepared, for submission at each regular meeting of the Board of Directors, at
each annual meeting of the stockholders, and at such other times as may be
required by the Board of Directors, the President or the Executive Committee, a
statement of financial condition of the corporation in such detail as may be
required; and (c) in general, perform all the duties incident to the office of
Treasurer and such other duties as from time to time may be assigned to him by
the President, the Board of Directors or the Executive Committee.

     SECTION 6.11.  Assistant Secretary or Treasurer.  The Assistant Secretaries
                    --------------------------------                            
and Assistant Treasurers shall, in general, perform such duties as shall be
assigned to them by the Secretary or the Treasurer, respectively, or by the
President, the Board of Directors or the Executive Committee.  The Assistant
Secretaries and Assistant Treasurers shall, in the absence of the Secretary or
Treasurer, respectively, perform all functions and duties which such absent
officers may delegate, but such delegation shall not relieve the absent officer
from the responsibilities and liabilities of his office.  The Assistant
Secretaries may sign, with the President or a Vice President, certificates for
shares of the corporation, the issue of which shall have been authorized by a
resolution of the Board of Directors.  The Assistant Treasurers shall
respectively, if required by the Board of Directors, give bonds for the faithful
discharge of their duties in such sums and with such sureties as the Board of
Directors shall determine.

                                      -14-
<PAGE>
 
                                 ARTICLE VII

                         CONTRACTS, CHECKS AND DEPOSITS

          SECTION 7.1.  Contracts.  Subject to the provisions of Section 6.1,
                        ---------                                            
the Board of Directors may authorize any officer, officers, agent or agents, to
enter into any contract or execute and deliver any instrument in the name of and
on behalf of the corporation, and such authority may be general or confined to
specific instances.

          SECTION 7.2.  Checks, etc.  All checks, demands, drafts or other
                        -----------                                       
orders for the payment of money, notes or other evidences of indebtedness issued
in the name of the corporation, shall be signed by such officer or officers or
such agent or agents of the corporation, and in such manner, as shall be
determined by the Board of Directors.

          SECTION 7.3.  Deposits.  All funds of the corporation not otherwise
                        --------                                             
employed shall be deposited from time to time to the credit of the corporation
in such banks, trust companies or other depositories as the Board of Directors
may select.

                                  ARTICLE VIII

                             CERTIFICATES OF STOCK

          SECTION 8.1.  Issuance.  Each stockholder of this corporation shall be
                        --------                                                
entitled to a certificate or certificates showing the number of shares of stock
registered in his name on the books of the corporation.  The certificates shall
be in such form as may be determined by the Board of Directors, shall be issued
in numerical order and shall be entered in the books of the corporation as they
are issued.  They shall exhibit the holder's name and number of shares and shall
be signed by the President or a Vice President and by the Secretary or an
Assistant Secretary.  If any certificate is countersigned (1) by a transfer
agent other than the corporation or any employee of the corporation, or (2) by a
registrar other than the corporation or any employee of the corporation, any
other signature on the certificate may be a facsimile.  If the

                                      -15-
<PAGE>
 
corporation shall be authorized to issue more than one class of stock or more
than one series of any class, the designations, preferences and relative
participating, optional or other special rights of each class of stock or series
thereof and the qualifications, limitations or restrictions of such preferences
and rights shall be set forth in full or summarized on the face or back of the
certificate which the corporation shall issue to represent such class of stock;
provided that, except as otherwise provided by statute, in lieu of the foregoing
requirements there may be set forth on the face or back of the certificate which
the corporation shall issue to represent such class or series of stock, a
statement that the corporation will furnish to each stockholder who so requests
the designations, preferences and relative, participating, optional or other
special rights of each class of stock or series thereof and the qualifications,
limitations or restrictions of such preferences and rights.  All certificates
surrendered to the corporation for transfer shall be cancelled and no new
certificate shall be issued until the former certificate for a like number of
shares shall have been surrendered and cancelled, except that in the case of a
lost, stolen, destroyed or mutilated certificate a new one may be issued
therefor upon such terms and with such indemnity, if any, to the corporation as
the Board of Directors may prescribe.  Certificates shall not be issued
representing fractional shares of stock.

          SECTION 8.2.  Lost Certificates.  The Board of Directors may direct a
                        -----------------                                      
new certificate or certificates to be issued in place of any certificate or
certificates theretofore issued by the corporation alleged to have been lost,
stolen or destroyed, upon the making of an affidavit of that fact by the person
claiming the certificate of stock to be lost, stolen or destroyed.  When
authorizing such issue of a new certificate or certificates, the Board of
Directors may, in its discretion and as a condition precedent to the issuance
thereof, require the owner of such lost, stolen or destroyed certificate or
certificates, or his legal representative, to advertise the same in such manner
as it shall require or to give the corporation a bond in such sum as it may
direct as

                                      -16-
<PAGE>
 
indemnity against any claim that may be made against the corporation with
respect to the certificate or certificates alleged to have been lost, stolen or
destroyed, or both.

          SECTION 8.3.  Transfers.  Upon surrender to the corporation or the
                        ---------                                           
transfer agent of the corporation of a certificate for shares duly endorsed or
accompanied by proper evidence of succession, assignment or authority to
transfer, it shall be the duty of the corporation to issue a new certificate to
the person entitled thereto, cancel the old certificate and record the
transaction upon its books.  Transfers of shares shall be made only on the books
of the corporation by the registered holder thereof, or by his attorney
thereunto authorized by power of attorney and filed with the Secretary of the
corporation or the Transfer Agent.

          SECTION 8.4.  Registered Stockholders.  The corporation shall be
                        -----------------------                           
entitled to treat the holder of record of any share or shares of stock as the
holder of record of any share or shares of stock as the holder in fact thereof,
and accordingly, shall not be bound to recognize any equitable or other claim to
or interest in such share or shares on the part of any other person, whether or
not it shall have express or other notice thereof, except as otherwise provided
by the laws of the State of Delaware.

                                  ARTICLE IX

                                   DIVIDENDS

          SECTION 9.1.  Declaration.  Dividends upon the capital stock of the
                        -----------                                          
corporation, subject to the provisions of the Certificate of Incorporation, if
any, may be declared by the Board of Directors at any regular or special
meeting, pursuant to law.  Dividends may be paid in cash, in property or in
shares of capital stock, subject to the provisions of the Certificate of
Incorporation.

          SECTION 9.2.  Reserve.  Before payment of any dividend, there may be
                        -------                                               
set aside out of any funds of the corporation available for dividends such sum
or sums as the Board of

                                      -17-
<PAGE>
 
Directors from time to time, in their absolute discretion, think proper as a
reserve or reserves to meet contingencies, or for equalizing dividends, or for
repairing or maintaining any property of the corporation, or for such other
purpose as the Board of Directors shall think conducive to the interest of the
corporation, and the Directors may modify or abolish any such reserve in the
manner in which it was created.

                                   ARTICLE X

                                INDEMNIFICATION

          SECTION 10.1.  Third Party Actions.  The corporation shall indemnify
                         -------------------                                  
any person who was or is a party or is threatened to be made a party to any
threatened, pending or completed action, suit or proceeding, whether civil,
criminal, administrative or investigative (other than an action by or in the
right of the corporation) by reason of the fact that he is or was a director,
officer, employee or agent of the corporation, or is or was serving at the
request of the corporation as a director, officer, employee or agent of another
corporation, partnership, joint venture, trust or other enterprise, against
expenses (including attorneys' fees), judgments, fines and amounts paid in
settlement actually and reasonably incurred by him in connection with such
action, suit or proceeding if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful.  The termination of any
action, suit or proceeding by judgment, order, settlement or conviction, or upon
a plea of nolo contendere or its equivalent, shall not, of itself, create a
presumption that the person did not act in good faith and in a manner which he
reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had
reasonable cause to believe that his conduct was unlawful.

                                      -18-
<PAGE>
 
          SECTION 10.2.  Actions by or in the Right of the Corporation.  The
                         ---------------------------------------------      
corporation shall indemnify any person who was or is a party or is threatened to
be made a party to any threatened, pending or completed action or suit by or in
the right of the corporation to procure a judgment in its favor by reason of the
fact that he is or was a director, officer, employee or agent of the
corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise, against expenses (including attorneys' fees)
actually and reasonably incurred by him in connection with the defense or
settlement of such action or suit if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation and except that no indemnification shall be made in respect of any
claim, issue or matter as to which such person shall have been adjudged to be
liable to the corporation unless and only to the extent that the Court of
Chancery or the court in which such action or suit was brought shall determine
upon application that, despite the adjudication of liability but in view of all
the circumstances of the case, such person is fairly and reasonably entitled to
indemnity for such expenses which the Court of Chancery or such other court
shall deem proper.

          SECTION 10.3.  Determination of Conduct.  The determination that an
                         ------------------------                            
officer, director, employee or agent, has met the applicable standard of conduct
set forth in Sections 10.1 and 10.2 (unless indemnification is ordered by a
court) shall be made (1) by the Board of Directors by a majority vote of a
quorum consisting of directors who were not parties to such action, suit or
proceeding, or (2) if such quorum is not obtainable, or even if obtainable a
quorum of disinterested directors so directs, by independent legal counsel in a
written opinion, or (3) by the stockholders.

          SECTION 10.4.  Payment of Expenses in Advance.  Expenses incurred in
                         ------------------------------                       
defending a civil or criminal action, suit or proceeding shall be paid by the
corporation in advance of the

                                      -19-
<PAGE>
 
final disposition of such action, suit or proceeding as authorized by the Board
of Directors in the specific case upon receipt of an undertaking by or on behalf
of the director, officer, employee or agent to repay such amount unless it shall
ultimately be determined that he is entitled to be indemnified by the
corporation as authorized in this Article X.

          SECTION 10.5.  Definition.  For purposes of this Article X, references
                         ----------                                             
to "the corporation" shall include, in addition to the resulting corporation,
any constituent corporation (including any constituent of a constituent)
absorbed in a consolidation or merger which, if its separate existence had
continued, would have had power and authority to indemnify its directors,
officers, and employees or agents, so that any person who is or who was a
director, officer, employee or agent of such constituent corporation, or is or
was serving at the request of such constituent corporation as a director,
officer, employee or agent of another corporation, partnership, joint venture,
trust or other enterprise, shall stand in the same position under the provisions
of this Article X, with respect to the resulting or surviving corporation as he
would have with respect to such constituent corporation if its separate
existence had continued.

          SECTION 10.6.  Indemnity Not Exclusive.  The indemnification provided
                         -----------------------                               
hereunder shall not be deemed exclusive of any other rights to which those
seeking indemnification may be entitled under any other provisions of these
Bylaws, the Certificate of Incorporation, or any agreement, or vote of
stockholders or disinterested directors or otherwise, both as to action in his
official capacity and as to action in another capacity while holding such
office, and shall continue as to a person who has ceased to be a director,
officer, employee or agent and shall inure to the benefit of the heirs,
executors and administrators of such a person.

                                      -20-
<PAGE>
 
                                  ARTICLE XI

                                 MISCELLANEOUS

          SECTION 11.1.  Seal.  The corporate seal shall have inscribed thereon
                         ----                                                  
the name of the corporation, and the words "Corporate Seal, Delaware."  The seal
may be used by causing it or a facsimile thereof to be impressed or affixed or
otherwise reproduced.

          SECTION 11.2.  Books.  The books of the corporation may be kept
                         -----                                           
(subject to any provision contained in the statutes) outside the State of
Delaware at the offices of the corporation at Houston, Texas, or at such other
place or places as may be designated from time to time by the Board of
Directors.

                                  ARTICLE XII

                                   AMENDMENT

          These Bylaws may be altered, amended or repealed at any regular
meeting of the Board of Directors without prior notice, or at any special
meeting of the Board of Directors if notice of such alteration, amendment or
repeal be contained in the notice of such special meeting.

                                      -21-

<PAGE>
 
                                                                     EXHIBIT 4.1

================================================================================



                ______________________________________________

                       CROWN CASTLE INTERNATIONAL CORP.

                                   As Issuer

                ______________________________________________

                             SERIES A AND SERIES B

                                 $251,000,000

                    10 5/8% SENIOR DISCOUNT NOTES DUE 2007

                        ______________________________

                                   INDENTURE

                         Dated as of November 25, 1997

                        ______________________________



                        ______________________________

                    United States Trust Company of New York

                                  As Trustee

                        ______________________________




================================================================================
<PAGE>
 
                            CROSS-REFERENCE TABLE*

<TABLE>
<CAPTION>
Trust Indenture
Act Section                                                Indenture Section
<S>                                                            <C>
310(a)(1)..................................................... 7.10
   (a)(2)..................................................... 7.10
   (a)(3)..................................................... N.A.
   (a)(4)..................................................... N.A.
   (a)(5)..................................................... 7.10
   (b)........................................................ 7.10
   (c)........................................................ N.A.
311(a)........................................................ 7.11
   (b)........................................................ 7.11
   (c)........................................................ N.A.
312(a)........................................................ 2.05
   (b)........................................................ 11.03
   i(c)....................................................... 11.03
313(a)........................................................ 7.06
   (b)(1)..................................................... 10.03
   (b)(2)..................................................... 7.07
   (c)........................................................ 7.06; 11.02
   (d)........................................................ 7.06
314(a)........................................................ 4.03; 11.02
   (b)........................................................ 10.02
   (c)(1)..................................................... 11.04
   (c)(2)..................................................... 11.04
   (c)(3)..................................................... N.A.
   (d)........................................................ 10.03,
10.04, 10.05
   (e)........................................................ 11.05
   (f)........................................................ NA
315(a)........................................................ 7.01
   (b)........................................................ 7.05, 11.02
   (c)........................................................ 7.01
   (d)........................................................ 7.01
   (e)........................................................ 6.11
316(a)(last sentence)......................................... 2.09
   (a)(1)(A).................................................. 6.05
   (a)(1)(B).................................................. 6.04
   (a)(2)..................................................... N.A.
   (b)........................................................ 6.07
   (c)........................................................ 2.12
317(a)(1)..................................................... 6.08
   (a)(2)..................................................... 6.09
   (b)........................................................ 2.04
318(a)........................................................ 11.01
   (b)........................................................ N.A.
</TABLE>
<PAGE>
 
<TABLE> 
<S>                                                            <C> 
   (c)........................................................ 11.01      
</TABLE>

N.A. means not applicable.

*This Cross-Reference Table is not part of the Indenture.

                                       2
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------

<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ---- 
<S>                                                                         <C>
ARTICLE 1. DEFINITIONS AND INCORPORATION BY REFERENCE........................  1                                      
                                                                                                                      
 SECTION 1.01. DEFINITIONS...................................................  1                                      
                                                                                                                      
 SECTION 1.02. OTHER DEFINITIONS............................................. 16                                      
                                                                                                                      
 SECTION 1.03................................................................ 17                                      
                                                                                                                      
 SECTION 1.04. RULES OF CONSTRUCTION......................................... 17                                      
                                                                                                                      
ARTICLE 2. THE NOTES......................................................... 18                                      
                                                                                                                      
 SECTION 2.01. FORM AND DATING............................................... 18                                      
                                                                                                                      
 SECTION 2.02. EXECUTION AND AUTHENTICATION.................................. 19                                      
                                                                                                                      
 SECTION 2.03. REGISTRAR AND PAYING AGENT.................................... 19                                      
                                                                                                                      
 SECTION 2.04. PAYING AGENT TO HOLD MONEY IN TRUST........................... 20                                      
                                                                                                                      
 SECTION 2.05. HOLDER LISTS.................................................. 20                                      
                                                                                                                      
 SECTION 2.06. TRANSFER AND EXCHANGE......................................... 20                                      
                                                                                                                      
 SECTION 2.07. REPLACEMENT NOTES............................................. 32                                      
                                                                                                                      
 SECTION 2.08. OUTSTANDING NOTES............................................. 32                                      
                                                                                                                      
 SECTION 2.09. TREASURY NOTES................................................ 32                                      
                                                                                                                      
 SECTION 2.10. TEMPORARY NOTES............................................... 33                                      
                                                                                                                      
 SECTION 2.11. CANCELLATION.................................................. 33                                      
                                                                                                                      
 SECTION 2.12. DEFAULTED INTEREST............................................ 33                                      
                                                                                                                      
ARTICLE 3. REDEMPTION AND PREPAYMENT......................................... 33                                      
                                                                                                                      
 SECTION 3.01. NOTICES TO TRUSTEE............................................ 33                                      
                                                                                                                      
 SECTION 3.02. SELECTION OF NOTES TO BE REDEEMED............................. 34                                      
                                                                                                                      
 SECTION 3.03. NOTICE OF REDEMPTION.......................................... 34                                      
                                                                                                                      
 SECTION 3.04. EFFECT OF NOTICE OF REDEMPTION................................ 35                                      
</TABLE> 
<PAGE>
 
<TABLE>                                                                   
<S>                                                                                                     <C> 
 SECTION 3.05. DEPOSIT OF REDEMPTION PRICE.............................................................  35          
                                                                                                                     
 SECTION 3.06. NOTES REDEEMED IN PART..................................................................  35          
                                                                                                                     
 SECTION 3.07. OPTIONAL REDEMPTION.....................................................................  36          
                                                                                                                     
 SECTION 3.08. MANDATORY REDEMPTION....................................................................  36          
                                                                                                                     
 SECTION 3.09. OFFER TO PURCHASE BY APPLICATION OF EXCESS PROCEEDS.....................................  36          
                                                                                                                     
ARTICLE 4. COVENANTS...................................................................................  38          
                                                                                                                     
 SECTION 4.01. PAYMENT OF NOTES........................................................................  38          
                                                                                                                     
 SECTION 4.02. MAINTENANCE OF OFFICE OR AGENCY.........................................................  39          
                                                                                                                     
 SECTION 4.03. REPORTS.................................................................................  39          
                                                                                                                     
 SECTION 4.04. COMPLIANCE CERTIFICATE..................................................................  40          
                                                                                                                     
 SECTION 4.05. TAXES...................................................................................  40          
                                                                                                                     
 SECTION 4.06. STAY, EXTENSION AND USURY LAWS..........................................................  41          
                                                                                                                     
 SECTION 4.07. RESTRICTED PAYMENTS.....................................................................  41          
                                                                                                                     
 SECTION 4.08. DIVIDEND AND OTHER PAYMENT RESTRICTIONS AFFECTING SUBSIDIARIES..........................  43          
                                                                                                                     
 SECTION 4.09. INCURRENCE OF INDEBTEDNESS AND ISSUANCE OF PREFERRED STOCK..............................  44          
                                                                                                                     
 SECTION 4.10. ASSET SALES.............................................................................  46          
                                                                                                                     
 SECTION 4.11. TRANSACTIONS WITH AFFILIATES............................................................  47          
                                                                                                                     
 SECTION 4.12. LIENS...................................................................................  48          
                                                                                                                     
 SECTION 4.13. BUSINESS ACTIVITIES.....................................................................  48          
                                                                                                                     
 SECTION 4.14. CORPORATE EXISTENCE.....................................................................  48          
                                                                                                                     
 SECTION 4.15. OFFER TO REPURCHASE UPON CHANGE OF CONTROL..............................................  48          
                                                                                                                     
 SECTION 4.16. LIMITATION ON SALE AND LEASEBACK TRANSACTIONS...........................................  49          
                                                                                                                     
 SECTION 4.17. LIMITATION ON ISSUANCES AND SALES OF CAPITAL STOCK OF RESTRICTED SUBSIDIARIES...........  50          
                                                                                                                     
 SECTION 4.18. LIMITATION ON ISSUANCES OF GUARANTEES OF INDEBTEDNESS...................................  50          
                                                                                                                     
ARTICLE 5. SUCCESSORS..................................................................................  50          
                                                                                                                     
 SECTION 5.01. MERGER, CONSOLIDATION OR SALE OF ASSETS.................................................  50           
</TABLE> 

                                      ii
<PAGE>
 
<TABLE> 
<S>                                                                                                     <C>            
 SECTION 5.02. SUCCESSOR CORPORATION SUBSTITUTED.......................................................  51           
                                                                                                                      
ARTICLE 6. DEFAULTS AND REMEDIES.......................................................................  51           
                                                                                                                      
 SECTION 6.01. EVENTS OF DEFAULT.......................................................................  51           
                                                                                                                      
 SECTION 6.02. ACCELERATION............................................................................  52           
                                                                                                                      
 SECTION 6.03. OTHER REMEDIES..........................................................................  53           
                                                                                                                      
 SECTION 6.04. WAIVER OF PAST DEFAULTS.................................................................  53           
                                                                                                                      
 SECTION 6.05. CONTROL BY MAJORITY.....................................................................  53           
                                                                                                                      
 SECTION 6.06. LIMITATION ON SUITS.....................................................................  54
                                                                                                                      
 SECTION 6.07. RIGHTS OF HOLDERS OF NOTES TO RECEIVE PAYMENT...........................................  54           
                                                                                                                      
 SECTION 6.08. COLLECTION SUIT BY TRUSTEE..............................................................  54           
                                                                                                                      
 SECTION 6.09. TRUSTEE MAY FILE PROOFS OF CLAIM........................................................  54           
                                                                                                                      
 SECTION 6.10. PRIORITIES..............................................................................  55           
                                                                                                                      
 SECTION 6.11. UNDERTAKING FOR COSTS...................................................................  55           
                                                                                                                      
ARTICLE 7. TRUSTEE.....................................................................................  56
                                                                                                                      
 SECTION 7.01. DUTIES OF TRUSTEE.......................................................................  56
                                                                                                                      
 SECTION 7.02. RIGHTS OF TRUSTEE.......................................................................  57
                                                                                                                      
 SECTION 7.03. INDIVIDUAL RIGHTS OF TRUSTEE............................................................  57           
                                                                                                                      
 SECTION 7.04. TRUSTEE'S DISCLAIMER....................................................................  57           
                                                                                                                      
 SECTION 7.05. NOTICE OF DEFAULTS......................................................................  58
                                                                                                                      
 SECTION 7.06. REPORTS BY TRUSTEE TO HOLDERS OF THE NOTES..............................................  58
                                                                                                                      
 SECTION 7.07. COMPENSATION AND INDEMNITY..............................................................  58           
                                                                                                                      
 SECTION 7.08. REPLACEMENT OF TRUSTEE..................................................................  59           
                                                                                                                      
 SECTION 7.09. SUCCESSOR TRUSTEE BY MERGER, ETC........................................................  60           
                                                                                                                      
 SECTION 7.10. ELIGIBILITY; DISQUALIFICATION...........................................................  60           
                                                                                                                      
 SECTION 7.11. PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY.......................................  60           
</TABLE> 

                                      iii
<PAGE>
 
<TABLE> 
<S>                                                                                                             <C>   
ARTICLE 8. LEGAL DEFEASANCE AND COVENANT DEFEASANCE............................................................  61
                                                                                                                      
 SECTION 8.01. OPTION TO EFFECT LEGAL DEFEASANCE OR COVENANT DEFEASANCE........................................  61
                                                                                                                      
 SECTION 8.02. LEGAL DEFEASANCE AND DISCHARGE..................................................................  61
                                                                                                                      
 SECTION 8.03. COVENANT DEFEASANCE.............................................................................  61   
                                                                                                                      
 SECTION 8.04. CONDITIONS TO LEGAL OR COVENANT DEFEASANCE......................................................  62
                                                                                                                      
 SECTION 8.05. DEPOSITED MONEY AND GOVERNMENT SECURITIES TO BE HELD IN TRUST; OTHER MISCELLANEOUS PROVISIONS...  63
                                                                                                                      
 SECTION 8.06. REPAYMENT TO COMPANY............................................................................  64
                                                                                                                      
 SECTION 8.07. REINSTATEMENT...................................................................................  64
                                                                                                                      
ARTICLE 9. AMENDMENT, SUPPLEMENT AND WAIVER....................................................................  64   
                                                                                                                      
 SECTION 9.01. WITHOUT CONSENT OF HOLDERS OF NOTES.............................................................  64   
                                                                                                                      
 SECTION 9.02. WITH CONSENT OF HOLDERS OF NOTES................................................................  65
                                                                                                                      
 SECTION 9.03. COMPLIANCE WITH TRUST INDENTURE ACT.............................................................  66   
                                                                                                                      
 SECTION 9.04. REVOCATION AND EFFECT OF CONSENTS...............................................................  66   
                                                                                                                      
 SECTION 9.05. NOTATION ON OR EXCHANGE OF NOTES................................................................  66   
                                                                                                                      
 SECTION 9.06. TRUSTEE TO SIGN AMENDMENTS, ETC.................................................................  66   
                                                                                                                      
ARTICLE 10. MISCELLANEOUS......................................................................................  67
                                                                                                                      
 SECTION 10.01. TRUST INDENTURE ACT CONTROLS...................................................................  67
                                                                                                                      
 SECTION 10.02. NOTICES........................................................................................  67
                                                                                                                      
 SECTION 10.03. COMMUNICATION BY HOLDERS OF NOTES WITH OTHER HOLDERS OF NOTES..................................  68   
                                                                                                                      
 SECTION 10.04. CERTIFICATE AND OPINION AS TO CONDITIONS PRECEDENT.............................................  68   
                                                                                                                      
 SECTION 10.05. STATEMENTS REQUIRED IN CERTIFICATE OR OPINION..................................................  69
                                                                                                                      
 SECTION 10.06. RULES BY TRUSTEE AND AGENTS....................................................................  69
                                                                                                                      
 SECTION 10.07. NO PERSONAL LIABILITY OF DIRECTORS, OFFICERS, EMPLOYEES AND STOCKHOLDERS.......................  69   
                                                                                                                      
 SECTION 10.08. GOVERNING LAW..................................................................................  69   
                                                                                                                      
 SECTION 10.09. NO ADVERSE INTERPRETATION OF OTHER AGREEMENTS..................................................  69   
</TABLE> 

                                      iv
<PAGE>
 
<TABLE> 
<S>                                                                          <C>     
 SECTION 10.10. SUCCESSORS................................................... 70                                      
                                                                                                                      
 SECTION 10.11. SEVERABILITY................................................. 70                                      
                                                                                                                      
 SECTION 10.12. COUNTERPART ORIGINALS........................................ 70                                      
                                                                                                                      
 SECTION 10.13. TABLE OF CONTENTS, HEADINGS, ETC............................. 70                                      
</TABLE>

EXHIBITS
Exhibit A-1 FORM OF NOTE
Exhibit A-2 FORM OF REGULATION S GLOBAL NOTE
Exhibit B FORM OF CERTIFICATE OF TRANSFER
Exhibit C FORM OF CERTIFICATE OF EXCHANGE
Exhibit D FORM OF NOTATION OF GUARANTEE
Exhibit E FORM OF SUPPLEMENTAL INDENTURE TO BE DELIVERED BY SUBSEQUENT
GUARANTORS

                                       v
<PAGE>
 
          INDENTURE dated as of November 25, 1997 between Crown Castle
International Corp., a Delaware corporation (the "Company"), and United States
Trust Company, as trustee (the "Trustee").

          The Company and the Trustee agree as follows for the benefit of each
other and for the equal and ratable benefit of the Holders of the 10 5/8%
Series A Senior Discount Notes due 2007 (the "Series A Notes") and the 10 5/8%
Series B Senior Discount Notes due 2007 (the "Series B Notes" and, together with
the Series A Notes, the "Notes"):

                                  ARTICLE 1.
                  DEFINITIONS AND INCORPORATION BY REFERENCE

Section 1.01.  DEFINITIONS.

          "144A Global Note" means a global note in the form of Exhibit A-1
hereto bearing the Global Note Legend and the Private Placement Legend and
deposited with or on behalf of, and registered in the name of, the Depositary or
its nominee that will be issued in a denomination equal to the outstanding
principal amount of the Notes sold in reliance on Rule 144A.

          "Accreted Value" means, as of any date of determination the sum of (a)
the initial Accreted Value (which is $597.65 per $1,000 in principal amount at
maturity of Notes) and (b) the portion of the excess of the principal amount at
maturity of each Note over such initial Accreted Value which shall have been
amortized through such date, such amount to be so amortized on a daily basis and
compounded semiannually on each May 15 and November 15 at the rate of 10.625%
per annum from the date of original issuance of the Notes through the date of
determination computed on the basis of a 360 day year of twelve 30-day months.
The Accreted Value of any Note on or after the Full Accretion Date shall be
equal to 100% of its stated principal amount.

          "Acquired Debt" means, with respect to any specified Person, (i)
Indebtedness of any other Person existing at the time such other Person is
merged with or into or became a Subsidiary of such specified Person, including,
without limitation, Indebtedness incurred in connection with, or in
contemplation of, such other Person merging with or into or becoming a
Subsidiary of such specified Person, and (ii) Indebtedness secured by a Lien
encumbering any assets acquired by such specified Person.

          "Adjusted Consolidated Cash Flow" has the meaning given to such term
in the definition of "Debt to Adjusted Consolidated Cash Flow Ratio."

          "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For purposes of this definition, "control"
(including, with correlative meanings, the terms "controlling," "controlled by"
and "under common control with"), as used with respect to any Person, shall mean
the possession, directly or indirectly, of the power to direct or cause the
direction of the management or policies of such Person, whether through the
ownership of voting securities, by agreement or otherwise; provided, however,
that beneficial ownership of 10% or more of the Voting Stock of a Person shall
be deemed to be control.

          "Agent" means any Registrar, Paying Agent or co-registrar.
<PAGE>
 
          "Applicable Procedures" means, with respect to any transfer or
exchange of or for beneficial interests in any Global Note, the rules and
procedures of the Depositary, Euroclear and Cedel that apply to such transfer or
exchange.

          "Asset Sale" means (i) the sale, lease, conveyance or other
disposition of any assets or rights (including, without limitation, by way of a
sale and leaseback) provided that the sale, lease, conveyance or other
disposition of all or substantially all of the assets of the Company and its
Subsidiaries taken as a whole will be governed by the provisions of Section 4.15
and/or the provisions described in Section 5.01 and not by the provisions of the
Asset Sale covenant in Section 4.10, and (ii) the issue or sale by the Company
or any of its Restricted Subsidiaries of Equity Interests of any of the
Company's Subsidiaries (other than directors' qualifying shares or shares
required by applicable law to be held by a Person other than the Company or a
Restricted Subsidiary), in the case of either clause (i) or (ii), whether in a
single transaction or a series of related transactions (a) that have a fair
market value in excess of $1.0 million or (b) for net proceeds in excess of $1.0
million. Notwithstanding the foregoing, the following items shall not be deemed
to be Asset Sales: (i) a transfer of assets by the Company to a Restricted
Subsidiary or by a Restricted Subsidiary to the Company or to another Restricted
Subsidiary, (ii) an issuance of Equity Interests by a Subsidiary to the Company
or to another Restricted Subsidiary, (iii) a Restricted Payment that is
permitted by the covenant in Section 4.07, (iv) grants of leases or licenses in
the ordinary course of business and (v) disposals of Cash Equivalents.

          "Attributable Debt" in respect of a sale and leaseback transaction
means, at the time of determination, the present value (discounted at the rate
of interest implicit in such transaction, determined in accordance with GAAP) of
the obligation of the lessee for net rental payments during the remaining term
of the lease included in such sale and leaseback transaction (including any
period for which such lease has been extended or may, at the option of the
lessor, be extended).

          "Bankruptcy Law" means Title 11, U.S. Code or any similar federal or
state law for the relief of debtors.

          "Berkshire Group" means Berkshire Fund III, A Limited Partnership,
Berkshire Fund IV, Limited Partnership, Berkshire Investors LLC and Berkshire
Partners LLC.

          "Board of Directors" means the Board of Directors of the Company, or
any authorized committee of the Board of Directors.

          "Broker-Dealer" means any broker or dealer registered under the
Exchange Act.

          "Business Day" means any day other than a Legal Holiday.

          "Capital Lease Obligation" means, at the time any determination
thereof is to be made, the amount of the liability in respect of a capital lease
that would at such time be required to be capitalized on a balance sheet in
accordance with GAAP.

          "Capital Stock" means (i) in the case of a corporation, corporate
stock, (ii) in the case of an association or business entity, any and all
shares, interests, participations, rights or other equivalents (however
designated) of corporate stock, (iii) in the case of a partnership or limited
liability company, partnership or membership interests (whether general or
limited) and (iv) any other interest 

                                       2
<PAGE>
 
or participation that confers on a Person the right to receive a share of the
profits and losses of, or distributions of assets of, the issuing Person.

          "Cash Equivalents" means (i) United States dollars, (ii) securities
issued or directly and fully guaranteed or insured by the United States
government or any agency or instrumentality thereof (provided that the full
faith and credit of the United States is pledged in support thereof) having
maturities of not more than six months from the date of acquisition, (iii)
certificates of deposit and eurodollar time deposits with maturities of six
months or less from the date of acquisition, bankers' acceptances with
maturities not exceeding six months and overnight bank deposits, in each case
with any lender party to the Senior Credit Facility or with any domestic
commercial bank having capital and surplus in excess of $500.0 million and a
Thompson Bank Watch Rating of "B" or better, (iv) repurchase obligations with a
term of not more than seven days for underlying securities of the types
described in clauses (ii) and (iii) above entered into with any financial
institution meeting the qualifications specified in clause (iii) above, (v)
commercial paper having the highest rating obtainable from either Moody's
Investors Service, Inc. or Standard & Poor's Ratings Group and, in each case
maturing within six months after the date of acquisition and (vi) money market
funds at least 95% of the assets of which constitute Cash Equivalents of the
kinds described in clauses (i)-(v) of this definition.

          "Cedel" means Cedel Bank, S.A.

          "Centennial Group" means Centennial Fund IV, L.P., Centennial Fund V,
L.P. and Centennial Entrepreneurs Fund V, L.P.

          "Change of Control" means the occurrence of any of the following: (i)
the sale, lease, transfer, conveyance or other disposition (other than by way of
merger or consolidation), in one or a series of related transactions, of all or
substantially all of the assets of the Company and its Restricted Subsidiaries,
taken as a whole to any "person" (as such term is used in Section 13(d)(3) of
the Exchange Act) other than a Principal or a Related Party of a Principal; (ii)
the adoption of a plan relating to the liquidation or dissolution of the
Company; (iii) the consummation of any transaction (including, without
limitation, any merger or consolidation) the result of which is that any
"person" (as defined above), other than the Principals and their Related
Parties, becomes the "beneficial owner" (as such term is defined in Rule 13d-3
and Rule 13d-5 under the Exchange Act, except that a person shall be deemed to
have "beneficial ownership" of all securities that such person has the right to
acquire, whether such right is currently exercisable or is exercisable only upon
the occurrence of a subsequent condition), directly or indirectly, of more than
50% of the Voting Stock of the Company (measured by voting power rather than
number of shares); provided that transfers of Equity Interests in the Company
between or among the beneficial owners of the Company's Equity Interests and/or
Equity Interests in CTSH, in each case as of the date of this Indenture, will
not be deemed to cause a Change of Control under this clause (iii) so long as no
single Person together with its Affiliates acquires a beneficial interest in
more of the Voting Stock of the Company than is at the time collectively
beneficially owned by the Principals and their Related Parties; (iv) the first
day on which a majority of the members of the Board of Directors of the Company
are not Continuing Directors; or (v) the Company consolidates with, or merges
with or into, any Person, or any Person consolidates with, or merges with or
into, the Company, in any such event pursuant to a transaction in which any of
the outstanding Voting Stock of the Company is converted into or exchanged for
cash, securities or other property, other than any such transaction where (x)
the Voting Stock of the Company outstanding immediately prior to such
transaction is converted into or exchanged for Voting Stock (other than
Disqualified Stock) of the 

                                       3
<PAGE>
 
surviving or transferee Person constituting a majority of the outstanding shares
of such Voting Stock of such surviving or transferee Person (immediately after
giving effect to such issuance) or (y) the Principals and their Related Parties
own a majority of such outstanding shares after such transaction.

          "Company" means Crown Castle International Corp., and any and all
successors thereto.

          "Consolidated Cash Flow" means, with respect to any Person for any
period, the Consolidated Net Income of such Person for such period plus (i)
provision for taxes based on income or profits of such Person and its Restricted
Subsidiaries for such period, to the extent that such provision for taxes was
included in computing such Consolidated Net Income, plus (ii) consolidated
interest expense of such Person and its Restricted Subsidiaries for such period,
whether paid or accrued and whether or not capitalized (including, without
limitation, amortization of debt issuance costs and original issue discount,
non-cash interest payments, the interest component of any deferred payment
obligations, the interest component of all payments associated with Capital
Lease Obligations, imputed interest with respect to Attributable Debt,
commissions, discounts and other fees and charges incurred in respect of letter
of credit or bankers' acceptance financings, and net payments (if any) pursuant
to Hedging Obligations), to the extent that any such expense was deducted in
computing such Consolidated Net Income, plus (iii) depreciation, amortization
(including amortization of goodwill and other intangibles and other non-cash
expenses (excluding any such non-cash expense to the extent that it represents
an accrual of or reserve for cash expenses in any future period) of such Person
and its Restricted Subsidiaries for such period to the extent that such
depreciation, amortization and other non-cash expenses were deducted in
computing such Consolidated Net Income, minus (iv) non-cash items increasing
such Consolidated Net Income for such period (excluding any items that were
accrued in the ordinary course of business), in each case on a consolidated
basis and determined in accordance with GAAP.

          "Consolidated Indebtedness" means, with respect to any Person as of
any date of determination, the sum, without duplication, of (i) the total amount
of Indebtedness of such Person and its Restricted Subsidiaries, plus (ii) the
total amount of Indebtedness of any other Person, to the extent that such
Indebtedness has been Guaranteed by the referent Person or one or more of its
Restricted Subsidiaries, plus (iii) the aggregate liquidation value of all
Disqualified Stock of such Person and all preferred stock of Restricted
Subsidiaries of such Person, in each case, determined on a consolidated basis in
accordance with GAAP.

          "Consolidated Net Income" means, with respect to any Person for any
period, the aggregate of the Net Income of such Person and its Restricted
Subsidiaries for such period, on a consolidated basis, determined in accordance
with GAAP; provided that (i) the Net Income (but not loss) of any Person other
than the Company that is not a Restricted Subsidiary or that is accounted for by
the equity method of accounting shall be included only to the extent of the
amount of dividends or distributions paid in cash to the referent Person or a
Restricted Subsidiary thereof, (ii) the Net Income of any Person acquired in a
pooling of interests transaction for any period prior to the date of such
acquisition shall be excluded, (iii) the cumulative effect of a change in
accounting principles shall be excluded and (iv) the Net Income (but not loss)
of any Unrestricted Subsidiary shall be excluded whether or not distributed to
the Company or one of its Restricted Subsidiaries.

          "Consolidated Tangible Assets" means, with respect to the Company, the
total consolidated assets of the Company and its Restricted Subsidiaries, less
the total intangible assets of the 

                                       4
<PAGE>
 
Company and its Restricted Subsidiaries, as shown on the most recent internal
consolidated balance sheet of the Company and such Restricted Subsidiaries
calculated on a consolidated basis in accordance with GAAP.

          "Continuing Directors" means, as of any date of determination, any
member of the Board of Directors of the Company who (i) was a member of such
Board of Directors on the date of this Indenture, (ii) was nominated for
election or elected to such Board of Directors with the approval of a majority
of the Continuing Directors who were members of such Board at the time of such
nomination or election or (iii) is a designee of a Principal or was nominated by
a Principal.

          "Corporate Trust Office of the Trustee" shall be at the address of the
Trustee specified in Section 10.02 hereof or such other address as to which the
Trustee may give notice to the Company.

          "Credit Facilities" means one or more debt facilities (including,
without limitation, the Senior Credit Facility) or commercial paper facilities
with banks or other institutional lenders providing for revolving credit loans,
term loans, receivables financing (including through the sale of receivables to
such lenders or to special purpose entities formed to borrow from such lenders
against such receivables) or letters of credit, in each case, as amended,
restated, modified, renewed, refunded, replaced or refinanced in whole or in
part from time to time.

          "CTSH" means Castle Transmission Services (Holdings) Ltd and any and
all successors thereto.

          "Custodian" means the Trustee, as custodian with respect to the Notes
in global form, or any successor entity thereto.

          "Debt to Adjusted Consolidated Cash Flow Ratio" means, as of any date
of determination, the ratio of (a) the Consolidated Indebtedness of the Company
as of such date to (b) the sum of (1) the Consolidated Cash Flow of the Company
for the four most recent full fiscal quarters ending immediately prior to such
date for which internal financial statements are available, less the Company's
Tower Cash Flow for such four-quarter period, plus (2) the product of four times
the Company's Tower Cash Flow for the most recent quarterly period (such sum
being referred to as "Adjusted Consolidated Cash Flow"), in each case determined
on a pro forma basis after giving effect to all acquisitions or dispositions of
assets made by the Company and its Subsidiaries from the beginning of such four-
quarter period through and including such date of determination (including any
related financing transactions) as if such acquisitions and dispositions had
occurred at the beginning of such four-quarter period. For purposes of making
the computation referred to above, (i) acquisitions that have been made by the
Company or any of its Restricted Subsidiaries, including through mergers or
consolidations and including any related financing transactions, during the
reference period or subsequent to such reference period and on or prior to the
Calculation Date shall be deemed to have occurred on the first day of the
reference period and Consolidated Cash Flow for such reference period shall be
calculated without giving effect to clause (ii) of the proviso set forth in
definition of Consolidated Net Income, and (ii) the Consolidated Cash Flow
attributable to discontinued operations, as determined in accordance with GAAP,
and operations or businesses disposed of prior to Calculation Date, shall be
excluded.

          "Default" means any event that is or with the passage of time or the
giving of notice or both would be an Event of Default.

                                       5
<PAGE>
 
          "Definitive Note" means a certificated Note registered in the name of
the Holder thereof and issued in accordance with Section 2.06 hereof, in the
form of Exhibit A-1 hereto except that such Note shall not bear the Global Note
Legend and shall not have the "Schedule of Exchanges of Interests in the Global
Note" attached thereto.

          "Depositary" means, with respect to the Notes issuable or issued in
whole or in part in global form, the Person specified in Section 2.03 hereof as
the Depositary with respect to the Notes, and any and all successors thereto
appointed as depositary hereunder and having become such pursuant to the
applicable provision of this Indenture.

          "Disqualified Stock" means any Capital Stock that, by its terms (or by
the terms of any security into which it is convertible or for which it is
exchangeable, in each case, at the option of the holder thereof), or upon the
happening of any event, matures or is mandatorily redeemable, pursuant to a
sinking fund obligation or otherwise, or redeemable at the option of the Holder
thereof, in whole or in part, on or prior to the date that is 91 days after the
date on which the Notes mature; provided, however, that any Capital Stock that
would constitute Disqualified Stock solely because the holders thereof have the
right to require the Company to repurchase such Capital Stock upon the
occurrence of a Change of Control or an Asset Sale shall not constitute
Disqualified Stock if the terms of such Capital Stock provide that the Company
may not repurchase or redeem any such Capital Stock pursuant to such provisions
unless such repurchase or redemption complies with the covenant described in
Section 4.07.

          "Eligible Indebtedness" means any Indebtedness other than (i)
Indebtedness in the form of, or represented by, bonds or other securities or any
guarantee thereof and (ii) Indebtedness that is, or may be, quoted, listed or
purchased and sold on any stock exchange, automated trading system or over-the-
counter or other securities market (including, without prejudice to the
generality of the foregoing, the market for securities eligible for resale
pursuant to Rule 144A under the Securities Act).

          "Eligible Receivables" means the accounts receivable (net of reserves
and allowances for doubtful accounts in accordance with GAAP) of the Company and
its Restricted Subsidiaries that are not more than 60 days past their due date
and that were entered into in the ordinary course of business on normal payment
terms as shown on the most recent internal consolidated balance sheet of the
Company and such Restricted Subsidiaries, all calculated on a consolidated basis
in accordance with GAAP.

          "Equity Interests" means Capital Stock and all warrants, options or
other rights to acquire Capital Stock (but excluding any debt security that is
convertible into, or exchangeable for, Capital Stock).

          "Euroclear" means Morgan Guaranty Trust Company of New York, Brussels
office, as operator of the Euroclear system.

          "Exchange Act" means the Securities Exchange Act of 1934, as amended.

          "Exchange Notes" means the Notes issued in the Exchange Offer pursuant
to Section 2.06(f) hereof.

          "Exchange Offer" has the meaning set forth in the Registration Rights
Agreement.

                                       6
<PAGE>
 
          "Exchange Offer Registration Statement" has the meaning set forth in
the Registration Rights Agreement.

          "Existing Indebtedness" means Indebtedness of the Company and its
Subsidiaries (other than Indebtedness under the Senior Credit Facility) in
existence on the date of this Indenture, until such amounts are repaid.

          "Full Accretion Date" means November 15, 2002.

          "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and pronouncements of
the Financial Accounting Standards Board or in such other statements by such
other entity as have been approved by a significant segment of the accounting
profession, which are in effect on the date of this Indenture.

          "Global Note Legend" means the legend set forth in Section
2.06(g)(ii), which is required to be placed on all Global Notes issued under
this Indenture.

          "Global Notes" means, individually and collectively, each of the
Restricted Global Note and the Unrestricted Global Note, in the form of Exhibit
A hereto issued in accordance with Section 2.01, 2.06(b)(iv), 2.06(d)(ii) or
2.06(f) hereof.

          "Government Securities" means direct obligations of, or obligations
guaranteed by, the United States of America, and the payment for which the
United States pledges its full faith and credit.

          "Guarantee" means a guarantee (other than by endorsement of negotiable
instruments for collection in the ordinary course of business), direct or
indirect, in any manner (including, without limitation, by way of a pledge of
assets or through letters of credit and reimbursement agreements in respect
thereof), of all or any part of any Indebtedness.

          "Hedging Obligations" means, with respect to any Person, the
obligations of such Person under (i) interest rate swap agreements, interest
rate cap agreements and interest rate collar agreements and (ii) other
agreements or arrangements designed to protect such Person against fluctuations
in interest rates or currency exchange rates.

          "Holder" means a Person in whose name a Note is registered.

          "Indebtedness" means, with respect to any Person, any indebtedness of
such Person, whether or not contingent, in respect of borrowed money or
evidenced by bonds, notes, debentures or similar instruments or letters of
credit (or reimbursement agreements in respect thereof) or banker's acceptances
or representing Capital Lease Obligations or the balance deferred and unpaid of
the purchase price of any property or representing any Hedging Obligations,
except any such balance that constitutes an accrued expense or trade payable, if
and to the extent any of the foregoing indebtedness (other than letters of
credit and Hedging Obligations) would appear as a liability upon a balance sheet
of such Person prepared in accordance with GAAP, as well as all Indebtedness of
others secured by a Lien on any asset of such Person whether or not such
Indebtedness is assumed by such Person (the amount of such Indebtedness as of
any date being deemed to be the lesser of the value of such property or assets
as of such date or the principal amount of such Indebtedness of such other
Person so secured) and, to the extent not otherwise included, the Guarantee by
such Person of any Indebtedness of any 

                                       7
<PAGE>
 
other Person. The amount of any Indebtedness outstanding as of any date shall be
(i) the accreted value thereof, in the case of any Indebtedness issued with
original issue discount, and (ii) the principal amount thereof, together with
any interest thereon that is more than 30 days past due, in the case of any
other Indebtedness.

          "Indenture" means this Indenture, as amended or supplemented from time
to time.

          "Indirect Participant" means a Person who holds a beneficial interest
in a Global Note through a Participant.

          "Investments" means, with respect to any Person, all investments by
such Person in other Persons (including Affiliates) in the forms of direct or
indirect loans (including guarantees of Indebtedness or other obligations),
advances or capital contributions (excluding commission, travel and similar
advances to officers and employees made in the ordinary course of business),
purchases or other acquisitions for consideration of Indebtedness, Equity
Interests or other securities, together with all items that are or would be
classified as investments on a balance sheet prepared in accordance with GAAP.
If the Company or any Restricted Subsidiary of the Company sells or otherwise
disposes of any Equity Interests of any direct or indirect Subsidiary of the
Company or a Restricted Subsidiary of the Company issues any of its Equity
Interests such that, in each case, after giving effect to any such sale or
disposition, such Person is no longer a Restricted Subsidiary of the Company,
the Company shall be deemed to have made an Investment on the date of any such
sale or disposition equal to the fair market value of the Equity Interests of
such Subsidiary not sold or disposed of in an amount determined as provided in
the final paragraph of the covenant described in Section 4.07.

          "Legal Holiday" means a Saturday, a Sunday or a day on which banking
institutions in the City of New York or at a place of payment are authorized by
law, regulation or executive order to remain closed.  If a payment date is a
Legal Holiday at a place of payment, payment may be made at that place on the
next succeeding day that is not a Legal Holiday, and no interest shall accrue on
such payment for the intervening period.

          "Letter of Transmittal" means the letter of transmittal to be prepared
by the Company and sent to all Holders of the Notes for use by such Holders in
connection with the Exchange Offer.

          "Lien" means, with respect to any asset, any mortgage, lien, pledge,
charge, security interest or encumbrance of any kind in respect of such asset,
whether or not filed, recorded or otherwise perfected under applicable law
(including any conditional sale or other title retention agreement, any lease in
the nature thereof, any option or other agreement to sell or give a security
interest in and any filing of or agreement to give any financing statement under
the Uniform Commercial Code (or equivalent statutes) of any jurisdiction).

          "Liquidated Damages" means all liquidated damages then owing pursuant
to Section 5 of the Registration Rights Agreement.

          "Nassau Group" means Nassau Capital Partners II, L.P. and NAS Partners
I, L.L.C.

          "Net Income" means, with respect to any Person, the net income (loss)
of such Person, determined in accordance with GAAP and before any reduction in
respect of preferred stock dividends, excluding, however, (i) any gain or loss,
together with any related provision for taxes on such gain or 

                                       8
<PAGE>
 
loss, realized in connection with (a) any Asset Sale (including, without
limitation, dispositions pursuant to sale and leaseback transactions) or (b) the
disposition of any securities by such Person or any of its Restricted
Subsidiaries or the extinguishment of any Indebtedness of such Person or any of
its Restricted Subsidiaries and (ii) any extraordinary gain or loss, together
with any related provision for taxes on such extraordinary gain or loss.

          "Net Proceeds" means the aggregate cash proceeds received by the
Company or any of its Restricted Subsidiaries in respect of any Asset Sale
(including, without limitation, any cash received upon the sale or other
disposition of any non-cash consideration received in any Asset Sale), net of
(i) the direct costs relating to such Asset Sale (including, without limitation,
legal, accounting and investment banking fees, and sales commissions) and any
relocation expenses incurred as a result thereof, (ii) taxes paid or payable as
a result thereof (after taking into account any available tax credits or
deductions and any tax sharing arrangements), (iii) amounts required to be
applied to the repayment of Indebtedness (other than Indebtedness under a Credit
Facility) secured by a Lien on the asset or assets that were the subject of such
Asset Sale, (iv) all distributions and other payments required to be made to
minority interest holders in Restricted Subsidiaries as a result of such Asset
Sale, (v) the deduction of appropriate amounts provided by the seller as a
reserve in accordance with GAAP against any liabilities associated with the
assets disposed of in such Asset Sale and retained by the Company or any
Restricted Subsidiary after such Asset Sale and (vi) without duplication, any
reserves that the Company's Board of Directors determines in good faith should
be made in respect of the sale price of such asset or assets for post closing
adjustments; provided that in the case of any reversal of any reserve referred
to in clause (v) or (vi) above, the amount so reserved shall be deemed to be Net
Proceeds from an Asset Sale as of the date of such reversal.

          "New Notes" means the Company's 10 5/8% Senior Discount Notes due
2007 to be issued pursuant to this Indenture: (i) in the Exchange Offer or (ii)
as contemplated by Section 4 of the Registration Rights Agreement.

          "Non-Recourse Debt" means Indebtedness (i) as to which neither the
Company nor any of its Restricted Subsidiaries (a) provides credit support of
any kind (including any undertaking, agreement or instrument that would
constitute Indebtedness), (b) is directly or indirectly liable (as a guarantor
or otherwise), or (c) constitutes the lender and (ii) no default with respect to
which (including any rights that the holders thereof may have to take
enforcement action against an Unrestricted Subsidiary) would permit (upon
notice, lapse of time or both) any holder of any other Indebtedness of the
Company or any of its Restricted Subsidiaries to declare a default on such other
Indebtedness or cause the payment thereof to be accelerated or payable prior to
its stated maturity; and (iii) as to which the lenders have been notified in
writing that they will not have any recourse to the stock or assets of the
Company or any of its Restricted Subsidiaries (except that this clause (iii)
will not apply to any Indebtedness incurred by CTSH and its Subsidiaries prior
to the date CTSH becomes a Subsidiary).

          "Non-U.S. Person" means a Person who is not a U.S. Person.

          "Notes" has the meaning assigned to it in the preamble to this
Indenture.

          "Obligations" means any principal, interest, penalties, fees,
indemnifications, reimbursements, damages and other liabilities payable under
the documentation governing any Indebtedness.

                                       9
<PAGE>
 
          "Offering" means the offering of the Notes by the Company.

          "Officer" means, with respect to any Person, the Chairman of the
Board, the Chief Executive Officer, the President, the Chief Operating Officer,
the Chief Financial Officer, the Treasurer, any Assistant Treasurer, the
Controller, the Secretary or any Vice-President of such Person.

          "Officers' Certificate" means a certificate signed on behalf of the
Company by two Officers of the Company, one of whom must be the principal
executive officer, the principal financial officer, the treasurer or the
principal accounting officer of the Company, that meets the requirements of
Section 11.05 hereof.

          "Opinion of Counsel" means an opinion from legal counsel who is
reasonably acceptable to the Trustee, that meets the requirements of Section
10.05 hereof.  The counsel may be an employee of or counsel to the Company, any
Subsidiary of the Company or the Trustee.

          "Participant" means, with respect to the Depositary, Euroclear or
Cedel, a Person who has an account with the Depositary, Euroclear or Cedel,
respectively (and, with respect to The Depository Trust Company, shall include
Euroclear and Cedel).

          "Participating Broker-Dealer" has the meaning set forth in the
Registration Rights Agreement.

          "Permitted Business" means any business conducted by the Company, its
Restricted Subsidiaries or CTSH and its Subsidiaries on the date of this
Indenture and any other business related, ancillary or complementary to any such
business.

          "Permitted Investments" means (a) any Investment in the Company or in
a Restricted Subsidiary of the Company; (b) any Investment in Cash Equivalents;
(c) any Investment by the Company or any Restricted Subsidiary of the Company in
a Person, if as a result of such Investment (i) such Person becomes a Restricted
Subsidiary of the Company or (ii) such Person is merged, consolidated or
amalgamated with or into, or transfers or conveys substantially all of its
assets to, or is liquidated into, the Company or a Restricted Subsidiary of the
Company; provided, that any such Investment by the Company or any Restricted
Subsidiary of the Company in CTSH or its Subsidiaries shall not be a Permitted
Investment if CTSH is thereafter designated an Unrestricted Subsidiary pursuant
to clause (iv) of the second paragraph of the covenant described in Section
4.07; (d) any Restricted Investment made as a result of the receipt of non-cash
consideration from an Asset Sale that was made pursuant to and in compliance
with the covenant described in Section 4.10; (e) any acquisition of assets
solely in exchange for the issuance of Equity Interests (other than Disqualified
Stock) of the Company; (f) receivables created in the ordinary course of
business; (g) loans or advances to employees made in the ordinary course of
business not to exceed $1.0 million at any one time outstanding; (h) securities
and other assets received in settlement of trade debts or other claims arising
in the ordinary course of business; (i) purchases of additional Equity Interests
in CTSH for cash pursuant to the Shareholders' Agreement as the same is in
effect on the date of this Indenture for aggregate cash consideration not to
exceed $20 million since the date of this Indenture; and (j) other Investments
in Permitted Businesses not to exceed 5% of the Company's Consolidated Tangible
Assets at any one time outstanding (each such Investment being measured as of
the date made and without giving effect to subsequent changes in value).

                                      10
<PAGE>
 
          "Permitted Liens" means (i) Liens securing Eligible Indebtedness of
the Company under one or more Credit Facilities that was permitted by the terms
of this Indenture to be incurred or (ii) Liens securing any Indebtedness of any
of the Company's Restricted Subsidiaries that was permitted by the terms of this
Indenture to be incurred; (iii) Liens in favor of the Company; (iv) Liens
existing on the date of this Indenture; (v) Liens for taxes, assessments or
governmental charges or claims that are not yet delinquent or that are being
contested in good faith by appropriate proceedings promptly instituted and
diligently concluded, provided that any reserve or other appropriate provision
as shall be required in conformity with GAAP shall have been made therefor; (vi)
Liens securing Indebtedness permitted to be incurred under clause (iv) of the
second paragraph of the covenant described in Section 4.09; and (vii) Liens
incurred in the ordinary course of business of the Company or any Restricted
Subsidiary of the Company with respect to obligations that do not exceed $5.0
million at any one time outstanding and that (a) are not incurred in connection
with the borrowing of money or the obtaining of advances or credit (other than
trade credit in the ordinary course of business) and (b) do not in the aggregate
materially detract from the value of the property or materially impair the use
thereof in the operation of business by the Company or such Restricted
Subsidiary.

          "Permitted Refinancing Indebtedness" means any Indebtedness of the
Company or any of its Restricted Subsidiaries issued in exchange for, or the net
proceeds of which are used to extend, refinance, renew, replace, defease or
refund other Indebtedness of the Company or any of its Restricted Subsidiaries
(other than intercompany Indebtedness); provided that: (i) the principal amount
(or initial accreted value, if applicable) of such Permitted Refinancing
Indebtedness does not exceed the principal amount of (or accreted value, if
applicable), plus accrued interest on, the Indebtedness so extended, refinanced,
renewed, replaced, defeased or refunded (plus the amount of expenses and
prepayment premiums incurred in connection therewith); (ii) such Permitted
Refinancing Indebtedness has a final maturity date later than the final maturity
date of, and has a Weighted Average Life to Maturity equal to or greater than
the Weighted Average Life to Maturity of, the Indebtedness being extended,
refinanced, renewed, replaced, defeased or refunded; (iii) if the Indebtedness
being extended, refinanced, renewed, replaced, defeased or refunded is
subordinated in right of payment to the Notes, such Permitted Refinancing
Indebtedness is subordinated in right of payment to, the Notes on terms at least
as favorable to the Holders of Notes as those contained in the documentation
governing the Indebtedness being extended, refinanced, renewed, replaced,
defeased or refunded; and (iv) such Indebtedness is incurred either by the
Company or by the Restricted Subsidiary who is the obligor on the Indebtedness
being extended, refinanced, renewed, replaced, defeased or refunded.

          "Person" means any individual, corporation, partnership, joint
venture, association, joint-stock company, trust, unincorporated organization or
government or agency or political subdivision thereof (including any subdivision
or ongoing business of any such entity or substantially all of the assets of any
such entity, subdivision or business).

          "Principals" means Berkshire Group, Centennial Group, Nassau Group,
TeleDiffusion de France International S.A. and any Related Party of the
foregoing.

          "Private Placement Legend" means the legend set forth in Section
2.06(g)(i) to be placed on all Notes issued under this Indenture except where
otherwise permitted by the provisions of this Indenture.

          "Prospectus" means the prospectus included in a Registration Statement
at the time such Registration Statement is declared effective, as amended or
supplemented by any prospectus 

                                      11
<PAGE>
 
supplement and by all other amendments thereto, including post-effective
amendments, and all material incorporated by reference into such Prospectus.

          "Public Equity Offering" means an underwritten primary public offering
of common stock of the Company pursuant to an effective registration statement
under the Securities Act.

          "QIB" means a "qualified institutional buyer" as defined in Rule 144A.

          "Registration Rights Agreement" means the Registration Rights
Agreement, dated as of November 25, 1997, by and among the Company and the other
parties named on the signature pages thereof, as such agreement may be amended,
modified or supplemented from time to time.

          "Registration Statement" means any registration statement of the
Company relating to (a) an offering of New Notes pursuant to an Exchange Offer
or (b) the registration for resale of Transfer Restricted Securities pursuant to
the Shelf Registration Statement, in each case, (i) that is filed pursuant to
the provisions of the Registration Rights Agreement and (ii) including the
Prospectus included therein, all amendments and supplements thereto (including
post-effective amendments) and all exhibits and material incorporated by
reference therein.

          "Regulation S" means Regulation S promulgated under the Securities
Act.

          "Regulation S Global Note" means a Regulation S Temporary Global Note
or Regulation S Permanent Global Note, as appropriate.

          "Regulation S Permanent Global Note" means a permanent global Note in
the form of Exhibit A-1 hereto bearing the Global Note Legend and the Private
Placement Legend and deposited with or on behalf of and registered in the name
of the Depositary or its nominee, issued in a denomination equal to the
outstanding principal amount of the Regulation S Temporary Global Note upon
expiration of the Restricted Period.

          "Regulation S Temporary Global Note" means a temporary global Note in
the form of Exhibit A-2 hereto bearing the Private Placement Legend and
deposited with or on behalf of and registered in the name of the Depositary or
its nominee, issued in a denomination equal to the outstanding principal amount
of the Notes initially sold in reliance on Rule 903 of Regulation S.

          "Related Party" with respect to any Principal means (A) any
controlling stockholder, 80% (or more) owned Subsidiary of such Principal or (B)
any trust, corporation, partnership or other entity, the beneficiaries,
stockholders, members, partners, owners or Persons beneficially holding an 80%
or more controlling interest of which consist of such Principal and/or such
other Persons referred to in the immediately preceding clause (A).

          "Responsible Officer" when used with respect to the Trustee, means any
officer within the Corporate Trust Administration of the Trustee (or any
successor group of the Trustee) or any other officer of the Trustee customarily
performing functions similar to those performed by any of the above designated
officers and also means, with respect to a particular corporate trust matter,
any other officer to whom such matter is referred because of his knowledge of
and familiarity with the particular subject.

          "Restricted Definitive Note" means a Definitive Note bearing the
Private Placement Legend.

                                      12
<PAGE>
 
          "Restricted Global Note" means a Global Note bearing the Private
Placement Legend.

          "Restricted Investment" means an Investment other than a Permitted
Investment.

          "Restricted Period" means the 40-day restricted period as defined in
Regulation S.

          "Restricted Subsidiary" of a Person means any Subsidiary of the
referent Person that is not an Unrestricted Subsidiary.

          "Roll-Up" means the transaction pursuant to which CTSH becomes a
Subsidiary of the Company.

          "Rule 144" means Rule 144 promulgated under the Securities Act.

          "Rule 144A" means Rule 144A promulgated under the Securities Act.

          "Rule 903" means Rule 903 promulgated under the Securities Act.

          "Rule 904" means Rule 904 promulgated the Securities Act.

          "SEC" means the Securities and Exchange Commission.

          "Securities Act" means the Securities Act of 1933, as amended.

          "Senior Credit Facility" means that certain loan agreement, dated as
of April 26, 1995, as amended by the first amendment dated as of June 26, 1996,
the second amendment dated as of January 17, 1997, the third amendment dated as
of April 3, 1997, and the fourth amendment dated as of October 31, 1997 and the
fifth amendment dated as of November 25, 1997, by and among Keybank National
Association and PNC Bank, National Association, as arrangers and agents for
those financial institutions listed therein, and Castle Tower Corporation and
Castle Tower Corporation (PR), including any related notes, guarantees,
collateral documents, instruments and agreements executed in connection
therewith, and in each case as amended, modified, renewed, refunded, replaced or
refinanced from time to time.

          "Shareholders' Agreement" means the agreement entered into by CTSH and
its four major shareholders, including the Company, on January 23, 1997,
governing the management and operation of CTSH and its Subsidiaries.

          "Shelf Registration Statement" means the Shelf Registration Statement
as defined in the Registration Rights Agreement.

          "Significant Subsidiary" means, with respect to any person, any
Restricted Subsidiary of such Person that would be a "significant subsidiary" of
such Person as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated
pursuant to the Securities Act, as such Regulation is in effect on the date of
this Indenture, except that all references to "10 percent" in Rule 1-02(w)(1),
(2) and (3) shall mean "5 percent."

          "Stated Maturity" means, with respect to any installment of interest
or principal on any series of Indebtedness, the date on which such payment of
interest or principal was scheduled to be 

                                      13
<PAGE>
 
paid in the original documentation governing such Indebtedness, and shall not
include any contingent obligations to repay, redeem or repurchase any such
interest or principal prior to the date originally scheduled for the payment
thereof.

          "Strategic Equity Investment" means a cash contribution to the common
equity capital of the Company or a purchase from the Company of common Equity
Interests (other than Disqualified Stock), in either case by or from a Strategic
Equity Investor and for aggregate cash consideration of at least $50.0 million.

          "Strategic Equity Investor" means a Person engaged in a Permitted
Business whose Total Equity Market Capitalization exceeds $1.0 billion.

          "Subsidiary" means, with respect to any Person, (i) any corporation,
association or other business entity of which more than 50% of the total voting
power of shares of Capital Stock entitled (without regard to the occurrence of
any contingency) to vote in the election of directors, managers or trustees
thereof is at the time owned or controlled, directly or indirectly, by such
Person or one or more of the other Subsidiaries of such Person (or a combination
thereof) and (ii) any partnership (a) the sole general partner or the managing
general partner of which is such Person or a Subsidiary of such Person or (b)
the only general partners of which are such Person or of one or more
Subsidiaries of such Person (or any combination thereof).

          "TIA" means the Trust Indenture Act of 1939 (15 U.S.C. (S)(S) 77aaa-
77bbbb) as in effect on the date on which this Indenture is qualified under the
TIA.

          "Total Equity Market Capitalization" of any Person means, as of any
day of determination, the sum of (i) the product of (A) the aggregate number of
outstanding primary shares of common stock of such Person on such day (which
shall not include any options or warrants on, or securities convertible or
exchangeable into, shares of common stock of such person) multiplied by (B) the
average closing price of such common stock listed on a national securities
exchange or the Nasdaq National Market System over the 20 consecutive business
days immediately preceding such day, plus (ii) the liquidation value of any
outstanding shares of preferred stock of such Person on such day.

          "Tower Asset Exchange" means any transaction in which the Company or
one of its Restricted Subsidiaries exchanges assets for Tower Assets and/or cash
or Cash Equivalents where the fair market value (evidenced by a resolution of
the Board of Directors set forth in an Officers' Certificate delivered to the
Trustee) of the Tower Assets and cash or Cash Equivalents received by the
Company and its Restricted Subsidiaries in such exchange is at least equal to
the fair market value of the assets disposed of in such exchange.

          "Tower Assets" means wireless transmission towers and related assets
that are located on the site of a transmission tower.

          "Tower Cash Flow" means, for any period, the Consolidated Cash Flow of
the Company and its Restricted Subsidiaries for such period that is directly
attributable to site rental revenue or license fees paid to lease or sublease
space on communication sites owned or leased by the Company, all determined on a
consolidated basis and in accordance with GAAP. Tower Cash Flow will not include
revenue or expenses attributable to non-site rental services provided by the
Company 

                                      14
<PAGE>
 
or any of its Restricted Subsidiaries to lessees of communication sites or
revenues derived from the sale of assets.

          "Transfer Restricted Securities" means each Note, until the earliest
to occur of (a) the date on which such Note is exchanged in the Exchange Offer
and entitled to be resold to the public by the Holder thereof without complying
with the prospectus delivery requirements of the Act, (b) the date on which such
Note has been disposed of in accordance with a Shelf Registration Statement, (c)
the date on which such Note is disposed of by a Broker-Dealer pursuant to the
"Plan of Distribution" contemplated by the Exchange Offer Registration Statement
(including delivery of the Prospectus contained therein) or (d) the date on
which such Note is distributable to the public pursuant to Rule 144 under the
Act.

          "Trustee" means the party named as such above until a successor
replaces it in accordance with the applicable provisions of this Indenture and
thereafter means the successor serving hereunder.

          "Unrestricted Definitive Note" means one or more Definitive Notes that
do not bear and are not required to bear the Private Placement Legend.

          "Unrestricted Global Note" means a permanent global Note in the form
of Exhibit A-1 attached hereto that bears the Global Note Legend and that has
the "Schedule of Exchanges of Interests in the Global Note" attached thereto,
and that is deposited with or on behalf of and registered in the name of the
Depositary, representing a series of Notes that do not bear the Private
Placement Legend.

          "Unrestricted Subsidiary" means (i) any Subsidiary of the Company that
is designated by the Board of Directors as an Unrestricted Subsidiary pursuant
to a Board Resolution; but only to the extent that such Subsidiary: (a) has no
Indebtedness other than Non-Recourse Debt; (b) is not party to any agreement,
contract, arrangement or understanding with the Company or any Restricted
Subsidiary of the Company unless the terms of any such agreement, contract,
arrangement or understanding are no less favorable to the Company or such
Restricted Subsidiary than those that might be obtained at the time from Persons
who are not Affiliates of the Company; (c) is a Person with respect to which
neither the Company nor any of its Restricted Subsidiaries has any direct or
indirect obligation (x) to subscribe for additional Equity Interests or (y) to
maintain or preserve such Person's financial condition or to cause such Person
to achieve any specified levels of operating results; (d) has not guaranteed or
otherwise directly or indirectly provided credit support for any Indebtedness of
the Company or any of its Restricted Subsidiaries; and (e) has at least one
director on its board of directors that is not a director or executive officer
of the Company or any of its Restricted Subsidiaries and has at least one
executive officer that is not a director or executive officer of the Company or
any of its Restricted Subsidiaries.  Any such designation by the Board of
Directors shall be evidenced to the Trustee by filing with the Trustee a
certified copy of the Board Resolution giving effect to such designation and an
Officers' Certificate certifying that such designation complied with the
foregoing conditions and was permitted by the covenant described in Section
4.07.  If, at any time, any Unrestricted Subsidiary would fail to meet the
foregoing requirements as an Unrestricted Subsidiary, it shall thereafter cease
to be Unrestricted Subsidiary for purposes of this Indenture and any
Indebtedness of such Subsidiary shall be deemed to be incurred by a Restricted
Subsidiary of the Company as of such date (and, if such Indebtedness is not
permitted to be incurred as of such date under the covenant described in Section
4.09, the Company shall be in default of such covenant).  The Board of Directors
of the Company may at any time designate any Unrestricted Subsidiary to be a
Restricted Subsidiary; provided that such 

                                      15
<PAGE>
 
designation shall be deemed to be an incurrence of Indebtedness by a Restricted
Subsidiary of the Company of any outstanding Indebtedness of such Unrestricted
Subsidiary and such designation shall only be permitted if (i) such Indebtedness
is permitted under the covenant described above in Section 4.09, calculated on a
pro forma basis as if such designation had occurred at the beginning of the 
four-quarter reference period, and (ii) no Default would occur or be in
existence following such designation.

          "U.S. Person" means a U.S. person as defined in Rule 902(o) under the
Securities Act.

          "Voting Stock" of any Person as of any date means the Capital Stock of
such Person that is at the time entitled to vote in the election of the Board of
Directors of such Person.

          "Weighted Average Life to Maturity" means, when applied to any
Indebtedness at any date, the number of years obtained by dividing (a) the sum
of the products obtained by multiplying (x) the amount of each then remaining
installment, sinking fund, serial maturity or other required payments of
principal, including payment at final maturity, in respect thereof, by (y) the
number of years (calculated to the nearest one-twelfth) that will elapse between
such date and the making of such payment, by (b) the then outstanding principal
amount of such Indebtedness.

          "Wholly Owned Restricted Subsidiary" of any Person means a Restricted
Subsidiary of such Person all of the outstanding Capital Stock or other
ownership interests of which (other than directors' qualifying shares) shall at
the time be owned by such Person or by one or more Wholly Owned Restricted
Subsidiaries of such Person or by such Person and one or more Wholly Owned
Restricted Subsidiaries of such Person.

Section 1.02.  OTHER DEFINITIONS.

<TABLE> 
<CAPTION> 
                                                      Defined in
       Term                                            Section
       <S>                                            <C>
 
       "Affiliate Transaction".........................  4.11
       "Asset Sale Offer"..............................  3.09
       "Authentication Order"..........................  2.02
       "Change of Control Offer".......................  4.15
       "Change of Control Payment".....................  4.15
       "Change of Control Payment Date"................  4.15
       "Covenant Defeasance"...........................  8.03
       "Event of Default"..............................  6.01
       "Excess Proceeds"...............................  4.10
       "incur".........................................  4.09
       "Legal Defeasance"..............................  8.02
       "Offer Amount"..................................  3.09
       "Offer Period"..................................  3.09
       "Pari Passu Notes"..............................  4.10
       "Paying Agent"..................................  2.03
       "Permitted Debt"................................  4.09
       "Purchase Date".................................  3.09
       "Registrar".....................................  2.03
</TABLE> 

                                      16
<PAGE>
 
<TABLE> 
       <S>                                               <C> 
       "Restricted Payments"...........................  4.07
</TABLE>

Section 1.03.

          Whenever this Indenture refers to a provision of the TIA, the
provision is incorporated by reference in and made a part of this Indenture.

          The following TIA terms used in this Indenture have the following
meanings:

          "indenture securities" means the Notes;

          "indenture security Holder" means a Holder of a Note;

          "indenture to be qualified" means this Indenture;

          "indenture trustee" or "institutional trustee" means the Trustee; and

          "obligor" on the Notes means the Company and any successor obligor
upon the Notes.

          All other terms used in this Indenture that are defined by the TIA,
defined by TIA reference to another statute or defined by SEC rule under the TIA
have the meanings so assigned to them.

Section 1.04.  RULES OF CONSTRUCTION.

          Unless the context otherwise requires:

               (1) a term has the meaning assigned to it;

               (2) an accounting term not otherwise defined has the meaning
          assigned to it in accordance with GAAP;

               (3)  "or" is not exclusive;

               (4) words in the singular include the plural, and in the plural
          include the singular;

               (5) provisions apply to successive events and transactions; and

               (6) references to sections of or rules under the Securities Act
          shall be deemed to include substitute, replacement of successor
          sections or rules adopted by the SEC from time to time.

                                      17
<PAGE>
 
                                  ARTICLE 2.
                                   THE NOTES

Section 2.01.  FORM AND DATING.

          (a)  General.

          The Notes and the Trustee's certificate of authentication shall be
substantially in the form of Exhibit A hereto.  The Notes may have notations,
legends or endorsements required by law, stock exchange rule or usage.  Each
Note shall be dated the date of its authentication.  The Notes shall be in
denominations of $1,000 and integral multiples thereof.

          The terms and provisions contained in the Notes shall constitute, and
are hereby expressly made, a part of this Indenture and the Company and the
Trustee, by their execution and delivery of this Indenture, expressly agree to
such terms and provisions and to be bound thereby.  However, to the extent any
provision of any Note conflicts with the express provisions of this Indenture,
the provisions of this Indenture shall govern and be controlling.

          (b)  Global Notes.

          Notes issued in global form shall be substantially in the form of
Exhibit A-1 or A-2 attached hereto (including the Global Note Legend thereon and
the "Schedule of Exchanges of Interests in the Global Note" attached thereto).
Notes issued in definitive form shall be substantially in the form of Exhibit A-
1 attached hereto (but without the Global Note Legend thereon and without the
"Schedule of Exchanges of Interests in the Global Note" attached thereto).  Each
Global Note shall represent such of the outstanding Notes as shall be specified
therein and each shall provide that it shall represent the aggregate principal
amount of outstanding Notes from time to time endorsed thereon and that the
aggregate principal amount of outstanding Notes represented thereby may from
time to time be reduced or increased, as appropriate, to reflect exchanges and
redemptions.  Any endorsement of a Global Note to reflect the amount of any
increase or decrease in the aggregate principal amount of outstanding Notes
represented thereby shall be made by the Trustee or the Note Custodian, at the
direction of the Trustee, in accordance with instructions given by the Holder
thereof as required by Section 2.06 hereof.

          (c)  Temporary Global Notes.

          Notes offered and sold in reliance on Regulation S shall be issued
initially in the form of the Regulation S Temporary Global Note, which shall be
deposited on behalf of the purchasers of the Notes represented thereby with the
Trustee, at its New York office, as custodian for the Depositary, and registered
in the name of the Depositary or the nominee of the Depositary for the accounts
of designated agents holding on behalf of Euroclear or Cedel Bank, duly executed
by the Company and authenticated by the Trustee as hereinafter provided.  The
Restricted Period shall be terminated upon the receipt by the Trustee of (i) a
written certificate from the Depositary, together with copies of certificates
from Euroclear and Cedel Bank certifying that they have received certification
of non-United States beneficial ownership of 100% of the aggregate principal
amount of the Regulation S Temporary Global Note (except to the extent of any
beneficial owners thereof who acquired an interest therein during the Restricted
Period pursuant to another exemption from registration under the Securities Act
and who will take delivery of a beneficial ownership interest in a 144A Global
Note bearing a Private Placement Legend, all as contemplated by Section
2.06(a)(ii) hereof), and (ii) an 

                                      18
<PAGE>
 
Officers' Certificate from the Company. Following the termination of the
Restricted Period, beneficial interests in the Regulation S Temporary Global
Note shall be exchanged for beneficial interests in Regulation S Permanent
Global Notes pursuant to the Applicable Procedures. Simultaneously with the
authentication of Regulation S Permanent Global Notes, the Trustee shall cancel
the Regulation S Temporary Global Note. The aggregate principal amount of the
Regulation S Temporary Global Note and the Regulation S Permanent Global Notes
may from time to time be increased or decreased by adjustments made on the
records of the Trustee and the Depositary or its nominee, as the case may be, in
connection with transfers of interest as hereinafter provided.

          (d) Euroclear and Cedel Procedures Applicable.

          The provisions of the "Operating Procedures of the Euroclear System"
and "Terms and Conditions Governing Use of Euroclear" and the "General Terms and
Conditions of Cedel Bank" and "Customer Handbook" of Cedel Bank shall be
applicable to transfers of beneficial interests in the Regulation S Temporary
Global Note and the Regulation S Permanent Global Notes that are held by
Participants through Euroclear or Cedel Bank.

Section 2.02.  EXECUTION AND AUTHENTICATION.

          Two Officers shall sign the Notes for the Company by manual or
facsimile signature.  The Company's seal shall be reproduced on the Notes and
may be in facsimile form.

          If an Officer whose signature is on a Note no longer holds that office
at the time a Note is authenticated, the Note shall nevertheless be valid.

          A Note shall not be valid until authenticated by the manual signature
of the Trustee.  The signature shall be conclusive evidence that the Note has
been authenticated under this Indenture.

          The Trustee shall, upon a written order of the Company signed by two
Officers (an "Authentication Order"), authenticate Notes for original issue up
to the aggregate principal amount stated in paragraph 4 of the Notes.  The
aggregate principal amount of Notes outstanding at any time may not exceed such
amount except as provided in Section 2.07 hereof.

          The Trustee may appoint an authenticating agent acceptable to the
Company to authenticate Notes.  An authenticating agent may authenticate Notes
whenever the Trustee may do so.  Each reference in this Indenture to
authentication by the Trustee includes authentication by such agent.  An
authenticating agent has the same rights as an Agent to deal with Holders or an
Affiliate of the Company.

                                      19
<PAGE>
 
Section 2.03.  REGISTRAR AND PAYING AGENT.

          The Company shall maintain an office or agency where Notes may be
presented for registration of transfer or for exchange ("Registrar") and an
office or agency where Notes may be presented for payment ("Paying Agent").  The
Registrar shall keep a register of the Notes and of their transfer and exchange.
The Company may appoint one or more co-registrars and one or more additional
paying agents.  The term "Registrar" includes any co-registrar and the term
"Paying Agent" includes any additional paying agent.  The Company may change any
Paying Agent or Registrar without notice to any Holder.  The Company shall
notify the Trustee in writing of the name and address of any Agent not a party
to this Indenture.  If the Company fails to appoint or maintain another entity
as Registrar or Paying Agent, the Trustee shall act as such.  The Company or any
of its Subsidiaries may act as Paying Agent or Registrar.

          The Company initially appoints The Depository Trust Company ("DTC") to
act as Depositary with respect to the Global Notes.

          The Company initially appoints the Trustee to act as the Registrar and
Paying Agent and to act as Note Custodian with respect to the Global Notes.

Section 2.04.  PAYING AGENT TO HOLD MONEY IN TRUST.

          The Company shall require each Paying Agent other than the Trustee to
agree in writing that the Paying Agent will hold in trust for the benefit of
Holders or the Trustee all money held by the Paying Agent for the payment of
principal, premium or Liquidated Damages, if any, or interest on the Notes, and
will notify the Trustee of any default by the Company in making any such
payment.  While any such default continues, the Trustee may require a Paying
Agent to pay all money held by it to the Trustee.  The Company at any time may
require a Paying Agent to pay all money held by it to the Trustee.  Upon payment
over to the Trustee, the Paying Agent (if other than the Company or a
Subsidiary) shall have no further liability for the money.  If the Company or a
Subsidiary acts as Paying Agent, it shall segregate and hold in a separate trust
fund for the benefit of the Holders all money held by it as Paying Agent.  Upon
any bankruptcy or reorganization proceedings relating to the Company, the
Trustee shall serve as Paying Agent for the Notes.

Section 2.05.  HOLDER LISTS.

          The Trustee shall preserve in as current a form as is reasonably
practicable the most recent list available to it of the names and addresses of
all Holders and shall otherwise comply with TIA (S) 312(a).  If the Trustee is
not the Registrar, the Company shall furnish to the Trustee at least seven
Business Days before each interest payment date and at such other times as the
Trustee may request in writing, a list in such form and as of such date as the
Trustee may reasonably require of the names and addresses of the Holders of
Notes and the Company shall otherwise comply with TIA (S) 312(a).

Section 2.06.  TRANSFER AND EXCHANGE.

          (a) Transfer and Exchange of Global Notes.

          A Global Note may not be transferred as a whole except by the
Depositary to a nominee of the Depositary, by a nominee of the Depositary to the
Depositary or to another nominee of the Depositary, the Depositary or any such
nominee to a successor Depositary or a nominee of such successor Depositary.
All Global Notes will be exchanged by the Company for Definitive Notes if (i)
the Company delivers to the Trustee notice from the 

                                      20
<PAGE>
 
Depositary that it is unwilling or unable to continue to act as Depositary or
that it is no longer a clearing agency registered under the Exchange Act and, in
either case, a successor Depositary is not appointed by the Company within 120
days after the date of such notice from the Depositary or (ii) the Company in
its sole discretion determines that the Global Notes (in whole but not in part)
should be exchanged for Definitive Notes and delivers a written notice to such
effect to the Trustee; provided that in no event shall the Regulation S
Temporary Global Note be exchanged by the Company for Definitive Notes prior to
(x) the expiration of the Restricted Period and (y) the receipt by the Registrar
of any certificates required pursuant to Rule 903(c)(3)(ii)(B) under the
Securities Act. Upon the occurrence of either of the preceding events in (i) or
(ii) above, Definitive Notes shall be issued in such names as the Depositary
shall instruct the Trustee. Global Notes also may be exchanged or replaced, in
whole or in part, as provided in Sections 2.07 and 2.10 hereof. Every Note
authenticated and delivered in exchange for, or in lieu of, a Global Note or any
portion thereof, pursuant to this Section 2.06 or Section 2.07 or 2.10 hereof,
shall be authenticated and delivered in the form of, and shall be, a Global
Note. A Global Note may not be exchanged for another Note other than as provided
in this Section 2.06(a), however, beneficial interests in a Global Note may be
transferred and exchanged as provided in Section 2.06(b),(c) or (f) hereof.

                  (b)  Transfer and Exchange of Beneficial Interests in the
Global Notes. The transfer and exchange of beneficial interests in the Global
Notes shall be effected through the Depositary, in accordance with the
provisions of this Indenture and the Applicable Procedures. Beneficial interests
in the Restricted Global Notes shall be subject to restrictions on transfer
comparable to those set forth herein to the extent required by the Securities
Act. Transfers of beneficial interests in the Global Notes also shall require
compliance with either subparagraph (i) or (ii) below, as applicable, as well as
one or more of the other following subparagraphs, as applicable:

          (i)     Transfer of Beneficial Interests in the Same Global Note.
     Beneficial interests in any Restricted Global Note may be transferred to
     Persons who take delivery thereof in the form of a beneficial interest in
     the same Restricted Global Note in accordance with the transfer
     restrictions set forth in the Private Placement Legend; provided, however,
     that prior to the expiration of the Restricted Period, transfers of
     beneficial interests in the Temporary Regulation S Global Note may not be
     made to a U.S. Person or for the account or benefit of a U.S. Person (other
     than an Initial Purchaser). Beneficial interests in any Unrestricted Global
     Note may be transferred to Persons who take delivery thereof in the form of
     a beneficial interest in an Unrestricted Global Note. No written orders or
     instructions shall be required to be delivered to the Registrar to effect
     the transfers described in this Section 2.06(b)(i).

          (ii)    All Other Transfers and Exchanges of Beneficial Interests in
     Global Notes. In connection with all transfers and exchanges of beneficial
     interests that are not subject to Section 2.06(b)(i) above, the transferor
     of such beneficial interest must deliver to the Registrar either (A) (1) a
     written order from a Participant or an Indirect Participant given to the
     Depositary in accordance with the Applicable Procedures directing the
     Depositary to credit or cause to be credited a beneficial interest in
     another Global Note in an amount equal to the beneficial interest to be
     transferred or exchanged and (2) instructions given in accordance with the
     Applicable Procedures containing information regarding the Participant
     account to be credited with such increase or (B) (1) a written order from a
     Participant or an Indirect Participant given to the Depositary in
     accordance with the Applicable Procedures directing the Depositary to cause
     to be issued a Definitive Note in an amount equal to the beneficial
     interest to be transferred or exchanged and (2) instructions given by the
     Depositary to the Registrar containing information regarding the

                                      21
<PAGE>
 
     Person in whose name such Definitive Note shall be registered to effect the
     transfer or exchange referred to in (1) above; provided that in no event
     shall Definitive Notes be issued upon the transfer or exchange of
     beneficial interests in the Regulation S Temporary Global Note prior to (x)
     the expiration of the Restricted Period and (y) the receipt by the
     Registrar of any certificates required pursuant to Rule 903 under the
     Securities Act. Upon consummation of an Exchange Offer by the Company in
     accordance with Section 2.06(f) hereof, the requirements of this Section
     2.06(b)(ii) shall be deemed to have been satisfied upon receipt by the
     Registrar of the instructions contained in the Letter of Transmittal
     delivered by the Holder of such beneficial interests in the Restricted
     Global Notes. Upon satisfaction of all of the requirements for transfer or
     exchange of beneficial interests in Global Notes contained in this
     Indenture and the Notes or otherwise applicable under the Securities Act,
     the Trustee shall adjust the principal amount of the relevant Global
     Note(s) pursuant to Section 2.06(h) hereof.

          (iii)   Transfer of Beneficial Interests to Another Restricted Global
     Note. A beneficial interest in any Restricted Global Note may be
     transferred to a Person who takes delivery thereof in the form of a
     beneficial interest in another Restricted Global Note if the transfer
     complies with the requirements of Section 2.06(b)(ii) above and the
     Registrar receives the following:

                  (A) if the transferee will take delivery in the form of a
             beneficial interest in the 144A Global Note, then the transferor
             must deliver a certificate in the form of Exhibit B hereto,
             including the certifications in item (1) thereof;

                  (B) if the transferee will take delivery in the form of a
             beneficial interest in the Regulation S Temporary Global Note or
             the Regulation S Global Note, then the transferor must deliver a
             certificate in the form of Exhibit B hereto, including the
             certifications in item (2) thereof; and

          (iv)    Transfer and Exchange of Beneficial Interests in a Restricted
     Global Note for Beneficial Interests in the Unrestricted Global Note. A
     beneficial interest in any Restricted Global Note may be exchanged by any
     holder thereof for a beneficial interest in an Unrestricted Global Note or
     transferred to a Person who takes delivery thereof in the form of a
     beneficial interest in an Unrestricted Global Note if the exchange or
     transfer complies with the requirements of Section 2.06(b)(ii) above and:

                  (A) such exchange or transfer is effected pursuant to the
             Exchange Offer in accordance with the Registration Rights Agreement
             and the holder of the beneficial interest to be transferred, in the
             case of an exchange, or the transferee, in the case of a transfer,
             certifies in the applicable Letter of Transmittal that it is not
             (1) a broker-dealer, (2) a Person participating in the distribution
             of the Exchange Notes or (3) a Person who is an affiliate (as
             defined in Rule 144) of the Company;

                  (B) such transfer is effected pursuant to the Shelf
             Registration Statement in accordance with the Registration Rights
             Agreement;

                  (C) such transfer is effected by a Participating Broker-Dealer
             pursuant to the Exchange Offer Registration Statement in accordance
             with the Registration Rights Agreement; or

                                      22
<PAGE>
 
          (D)    the Registrar receives the following:

             (1) if the holder of such beneficial interest in a Restricted
          Global Note proposes to exchange such beneficial interest for a
          beneficial interest in an Unrestricted Global Note, a certificate from
          such holder in the form of Exhibit C hereto, including the
          certifications in item (1)(a) thereof; or

             (2) if the holder of such beneficial interest in a Restricted
          Global Note proposes to transfer such beneficial interest to a Person
          who shall take delivery thereof in the form of a beneficial interest
          in an Unrestricted Global Note, a certificate from such holder in the
          form of Exhibit B hereto, including the certifications in item (4)
          thereof;

     and, in each such case set forth in this subparagraph (D), if the Registrar
     so requests or if the Applicable Procedures so require, an Opinion of
     Counsel in form reasonably acceptable to the Registrar to the effect that
     such exchange or transfer is in compliance with the Securities Act and that
     the restrictions on transfer contained herein and in the Private Placement
     Legend are no longer required in order to maintain compliance with the
     Securities Act.

          If any such transfer is effected pursuant to subparagraph (B) or (D)
above at a time when an Unrestricted Global Note has not yet been issued, the
Company shall issue and, upon receipt of an Authentication Order in accordance
with Section 2.02 hereof, the Trustee shall authenticate one or more
Unrestricted Global Notes in an aggregate principal amount equal to the
aggregate principal amount of beneficial interests transferred pursuant to
subparagraph (B) or (D) above.

          Beneficial interests in an Unrestricted Global Note cannot be
exchanged for, or transferred to Persons who take delivery thereof in the form
of, a beneficial interest in a Restricted Global Note.

     (c)  Transfer or Exchange of Beneficial Interests for Definitive Notes.

     (i)  Beneficial Interests in Restricted Global Notes to Restricted
  Definitive Notes.  If any holder of a beneficial interest in a Restricted
  Global Note proposes to exchange such beneficial interest for a Restricted
  Definitive Note or to transfer such beneficial interest to a Person who takes
  delivery thereof in the form of a Restricted Definitive Note, then, upon
  receipt by the Registrar of the following documentation:

          (A) if the holder of such beneficial interest in a Restricted Global
       Note proposes to exchange such beneficial interest for a Restricted
       Definitive Note, a certificate from such holder in the form of Exhibit C
       hereto, including the certifications in item (2)(a) thereof;

          (B) if such beneficial interest is being transferred to a QIB in
       accordance with Rule 144A under the Securities Act, a certificate to the
       effect set forth in Exhibit B hereto, including the certifications in
       item (1) thereof;

          (C) if such beneficial interest is being transferred to a Non-U.S.
       Person in an offshore transaction in accordance with Rule 903 or Rule 904
       under the Securities Act, a certificate to the effect set forth in
       Exhibit B hereto, including the certifications in item (2) thereof;

                                      23
<PAGE>
 
           (D) if such beneficial interest is being transferred pursuant to
       an exemption from the registration requirements of the Securities Act in
       accordance with Rule 144 under the Securities Act, a certificate to the
       effect set forth in Exhibit B hereto, including the certifications in
       item (3)(a) thereof;

           (E) if such beneficial interest is being transferred to the Company
       or any of its Subsidiaries, a certificate to the effect set forth in
       Exhibit B hereto, including the certifications in item (3)(b) thereof; or

           (F) if such beneficial interest is being transferred pursuant to an
       effective registration statement under the Securities Act, a certificate
       to the effect set forth in Exhibit B hereto, including the certifications
       in item (3)(c) thereof,

     the Trustee shall cause the aggregate principal amount of the applicable
     Global Note to be reduced accordingly pursuant to Section 2.06(h) hereof,
     and the Company shall execute and the Trustee shall authenticate and
     deliver to the Person designated in the instructions a Definitive Note in
     the appropriate principal amount.  Any Definitive Note issued in exchange
     for a beneficial interest in a Restricted Global Note pursuant to this
     Section 2.06(c) shall be registered in such name or names and in such
     authorized denomination or denominations as the holder of such beneficial
     interest shall instruct the Registrar through instructions from the
     Depositary and the Participant or Indirect Participant.  The Trustee shall
     deliver such Definitive Notes to the Persons in whose names such Notes are
     so registered.  Any Definitive Note issued in exchange for a beneficial
     interest in a Restricted Global Note pursuant to this Section 2.06(c)(i)
     shall bear the Private Placement Legend and shall be subject to all
     restrictions on transfer contained therein.

     (ii)  Notwithstanding Sections 2.06(c)(i)(A) and (C) hereof, a beneficial
  interest in the Regulation S Temporary Global Note may not be exchanged for a
  Definitive Note or transferred to a Person who takes delivery thereof in the
  form of a Definitive Note prior to (x) the expiration of the Restricted Period
  and (y) the receipt by the Registrar of any certificates required pursuant to
  Rule 903(c)(3)(ii)(B) under the Securities Act, except in the case of a
  transfer pursuant to an exemption from the registration requirements of the
  Securities Act other than Rule 903 or Rule 904.

     (iii) Beneficial Interests in Restricted Global Notes to Unrestricted
  Definitive Notes.  A holder of a beneficial interest in a Restricted Global
  Note may exchange such beneficial interest for an Unrestricted Definitive Note
  or may transfer such beneficial interest to a Person who takes delivery
  thereof in the form of an Unrestricted Definitive Note only if:

           (A) such exchange or transfer is effected pursuant to the Exchange
       Offer in accordance with the Registration Rights Agreement and the holder
       of such beneficial interest, in the case of an exchange, or the
       transferee, in the case of a transfer, certifies in the applicable Letter
       of Transmittal that it is not (1) a broker-dealer, (2) a Person
       participating in the distribution of the Exchange Notes or (3) a Person
       who is an affiliate (as defined in Rule 144) of the Company;

           (B) such transfer is effected pursuant to the Shelf Registration
       Statement in accordance with the Registration Rights Agreement;

                                      24
<PAGE>
 
           (C)    such transfer is effected by a Participating Broker-Dealer
       pursuant to the Exchange Offer Registration Statement in accordance with
       the Registration Rights Agreement; or

           (D)    the Registrar receives the following:

              (1) if the holder of such beneficial interest in a Restricted
           Global Note proposes to exchange such beneficial interest for a
           Definitive Note that does not bear the Private Placement Legend, a
           certificate from such holder in the form of Exhibit C hereto,
           including the certifications in item (1)(b) thereof; or

              (2) if the holder of such beneficial interest in a Restricted
           Global Note proposes to transfer such beneficial interest to a Person
           who shall take delivery thereof in the form of a Definitive Note that
           does not bear the Private Placement Legend, a certificate from such
           holder in the form of Exhibit B hereto, including the certifications
           in item (4) thereof;

     and, in each such case set forth in this subparagraph (D), if the Registrar
     so requests or if the Applicable Procedures so require, an Opinion of
     Counsel in form reasonably acceptable to the Registrar to the effect that
     such exchange or transfer is in compliance with the Securities Act and that
     the restrictions on transfer contained herein and in the Private Placement
     Legend are no longer required in order to maintain compliance with the
     Securities Act.

     (iv)  Beneficial Interests in Unrestricted Global Notes to Unrestricted
  Definitive Notes.  If any holder of a beneficial interest in an Unrestricted
  Global Note proposes to exchange such beneficial interest for a Definitive
  Note or to transfer such beneficial interest to a Person who takes delivery
  thereof in the form of a Definitive Note, then, upon satisfaction of the
  conditions set forth in Section 2.06(b)(ii) hereof, the Trustee shall cause
  the aggregate principal amount of the applicable Global Note to be reduced
  accordingly pursuant to Section 2.06(h) hereof, and the Company shall execute
  and the Trustee shall authenticate and deliver to the Person designated in the
  instructions a Definitive Note in the appropriate principal amount.  Any
  Definitive Note issued in exchange for a beneficial interest pursuant to this
  Section 2.06(c)(iii) shall be registered in such name or names and in such
  authorized denomination or denominations as the holder of such beneficial
  interest shall instruct the Registrar through instructions from the Depositary
  and the Participant or Indirect Participant.  The Trustee shall deliver such
  Definitive Notes to the Persons in whose names such Notes are so registered.
  Any Definitive Note issued in exchange for a beneficial interest pursuant to
  this Section 2.06(c)(iii) shall not bear the Private Placement Legend.

     (d)   Transfer and Exchange of Definitive Notes for Beneficial Interests.

     (i)   Restricted Definitive Notes to Beneficial Interests in Restricted
  Global Notes.  If any Holder of a Restricted Definitive Note proposes to
  exchange such Note for a beneficial interest in a Restricted Global Note or to
  transfer such Restricted Definitive Notes to a Person who takes delivery
  thereof in the form of a beneficial interest in a Restricted Global Note,
  then, upon receipt by the Registrar of the following documentation:

                                      25
<PAGE>
 
           (A) if the Holder of such Restricted Definitive Note proposes to
       exchange such Note for a beneficial interest in a Restricted Global Note,
       a certificate from such Holder in the form of Exhibit C hereto, including
       the certifications in item (2)(b) thereof;

           (B) if such Restricted Definitive Note is being transferred to a
       QIB in accordance with Rule 144A under the Securities Act, a certificate
       to the effect set forth in Exhibit B hereto, including the certifications
       in item (1) thereof;

           (C) if such Restricted Definitive Note is being transferred to a
       Non-U.S. Person in an offshore transaction in accordance with Rule 903 or
       Rule 904 under the Securities Act, a certificate to the effect set forth
       in Exhibit B hereto, including the certifications in item (2) thereof;

           (D) if such Restricted Definitive Note is being transferred pursuant
       to an exemption from the registration requirements of the Securities Act
       in accordance with Rule 144 under the Securities Act, a certificate to
       the effect set forth in Exhibit B hereto, including the certifications in
       item (3)(a) thereof;

           (E) if such Restricted Definitive Note is being transferred to the
       Company or any of its Subsidiaries, a certificate to the effect set forth
       in Exhibit B hereto, including the certifications in item (3)(b) thereof;
       or

           (F) if such Restricted Definitive Note is being transferred pursuant
       to an effective registration statement under the Securities Act, a
       certificate to the effect set forth in Exhibit B hereto, including the
       certifications in item (3)(c) thereof,

     the Trustee shall cancel the Restricted Definitive Note, increase or cause
     to be increased the aggregate principal amount of, in the case of clause
     (A) above, the appropriate Restricted Global Note, in the case of clause
     (B) above, the 144A Global Note, in the case of clause (C) above, the
     Regulation S Global Note, and in all other cases, the 144A Global Note.

     (ii)  Restricted Definitive Notes to Beneficial Interests in Unrestricted
  Global Notes.  A Holder of a Restricted Definitive Note may exchange such Note
  for a beneficial interest in an Unrestricted Global Note or transfer such
  Restricted Definitive Note to a Person who takes delivery thereof in the form
  of a beneficial interest in an Unrestricted Global Note only if:

           (A) such exchange or transfer is effected pursuant to the Exchange
       Offer in accordance with the Registration Rights Agreement and the
       Holder, in the case of an exchange, or the transferee, in the case of a
       transfer, certifies in the applicable Letter of Transmittal that it is
       not (1) a broker-dealer, (2) a Person participating in the distribution
       of the Exchange Notes or (3) a Person who is an affiliate (as defined in
       Rule 144) of the Company;

           (B) such transfer is effected pursuant to the Shelf Registration
       Statement in accordance with the Registration Rights Agreement;

           (C) such transfer is effected by a Participating Broker-Dealer
       pursuant to the Exchange Offer Registration Statement in accordance with
       the Registration Rights Agreement; or

                                      26
<PAGE>
 
           (D) the Registrar receives the following:

              (1) if the Holder of such Definitive Notes proposes to exchange
           such Notes for a beneficial interest in the Unrestricted Global Note,
           a certificate from such Holder in the form of Exhibit C hereto,
           including the certifications in item (1)(c) thereof; or

              (2) if the Holder of such Definitive Notes proposes to transfer
           such Notes to a Person who shall take delivery thereof in the form of
           a beneficial interest in the Unrestricted Global Note, a certificate
           from such Holder in the form of Exhibit B hereto, including the
           certifications in item (4) thereof;

     and, in each such case set forth in this subparagraph (D), if the Registrar
     so requests or if the Applicable Procedures so require, an Opinion of
     Counsel in form reasonably acceptable to the Registrar to the effect that
     such exchange or transfer is in compliance with the Securities Act and that
     the restrictions on transfer contained herein and in the Private Placement
     Legend are no longer required in order to maintain compliance with the
     Securities Act.

     Upon satisfaction of the conditions of any of the subparagraphs in this
     Section 2.06(d)(ii), the Trustee shall cancel the Definitive Notes and
     increase or cause to be increased the aggregate principal amount of the
     Unrestricted Global Note.

     (iii) Unrestricted Definitive Notes to Beneficial Interests in Unrestricted
  Global Notes. A Holder of an Unrestricted Definitive Note may exchange such
  Note for a beneficial interest in an Unrestricted Global Note or transfer such
  Definitive Notes to a Person who takes delivery thereof in the form of a
  beneficial interest in an Unrestricted Global Note at any time. Upon receipt
  of a request for such an exchange or transfer, the Trustee shall cancel the
  applicable Unrestricted Definitive Note and increase or cause to be increased
  the aggregate principal amount of one of the Unrestricted Global Notes.

           If any such exchange or transfer from a Definitive Note to a
beneficial interest is effected pursuant to subparagraphs (ii)(B), (ii)(D) or
(iii) above at a time when an Unrestricted Global Note has not yet been issued,
the Company shall issue and, upon receipt of an Authentication Order in
accordance with Section 2.02 hereof, the Trustee shall authenticate one or more
Unrestricted Global Notes in an aggregate principal amount equal to the
principal amount of Definitive Notes so transferred.

           (e) Transfer and Exchange of Definitive Notes for Definitive Notes.
Upon request by a Holder of Definitive Notes and such Holder's compliance with
the provisions of this Section 2.06(e), the Registrar shall register the
transfer or exchange of Definitive Notes.  Prior to such registration of
transfer or exchange, the requesting Holder shall present or surrender to the
Registrar the Definitive Notes duly endorsed or accompanied by a written
instruction of transfer in form satisfactory to the Registrar duly executed by
such Holder or by his attorney, duly authorized in writing.  In addition, the
requesting Holder shall provide any additional certifications, documents and
information, as applicable, required pursuant to the following provisions of
this Section 2.06(e).

     (i)   Restricted Definitive Notes to Restricted Definitive Notes.  Any
  Restricted Definitive Note may be transferred to and registered in the name of
  Persons who take delivery thereof in the form of a Restricted Definitive Note
  if the Registrar receives the following:

                                      27
<PAGE>
 
           (A) if the transfer will be made pursuant to Rule 144A under the
       Securities Act, then the transferor must deliver a certificate in the
       form of Exhibit B hereto, including the certifications in item (1)
       thereof;

           (B) if the transfer will be made pursuant to Rule 903 or Rule 904,
       then the transferor must deliver a certificate in the form of Exhibit B
       hereto, including the certifications in item (2) thereof; and

           (C) if the transfer will be made pursuant to any other exemption from
       the registration requirements of the Securities Act, then the transferor
       must deliver a certificate in the form of Exhibit B hereto, including the
       certifications, certificates and Opinion of Counsel required by item (3)
       thereof, if applicable.

     (ii)  Restricted Definitive Notes to Unrestricted Definitive Notes.  Any
  Restricted Definitive Note may be exchanged by the Holder thereof for an
  Unrestricted Definitive Note or transferred to a Person or Persons who take
  delivery thereof in the form of an Unrestricted Definitive Note if:

           (A) such exchange or transfer is effected pursuant to the Exchange
       Offer in accordance with the Registration Rights Agreement and the
       Holder, in the case of an exchange, or the transferee, in the case of a
       transfer, certifies in the applicable Letter of Transmittal that it is
       not (1) a broker-dealer, (2) a Person participating in the distribution
       of the Exchange Notes or (3) a Person who is an affiliate (as defined in
       Rule 144) of the Company;

           (B)    any such transfer is effected pursuant to the Shelf
       Registration Statement in accordance with the Registration Rights
       Agreement;

           (C)    any such transfer is effected by a Participating Broker-Dealer
       pursuant to the Exchange Offer Registration Statement in accordance with
       the Registration Rights Agreement; or

           (D)    the Registrar receives the following:

              (1) if the Holder of such Restricted Definitive Notes proposes to
           exchange such Notes for an Unrestricted Definitive Note, a
           certificate from such Holder in the form of Exhibit C hereto,
           including the certifications in item (1)(d) thereof; or

              (2) if the Holder of such Restricted Definitive Notes proposes to
           transfer such Notes to a Person who shall take delivery thereof in
           the form of an Unrestricted Definitive Note, a certificate from such
           Holder in the form of Exhibit B hereto, including the certifications
           in item (4) thereof;

     and, in each such case set forth in this subparagraph (D), if the Registrar
     so requests, an Opinion of Counsel in form reasonably acceptable to the
     Company to the effect that such exchange or transfer is in compliance with
     the Securities Act and that the restrictions on transfer contained herein
     and in the Private Placement Legend are no longer required in order to
     maintain compliance with the Securities Act.

                                      28
<PAGE>
 
     (iii) Unrestricted Definitive Notes to Unrestricted Definitive Notes.  A
  Holder of Unrestricted Definitive Notes may transfer such Notes to a Person
  who takes delivery thereof in the form of an Unrestricted Definitive Note.
  Upon receipt of a request to register such a transfer, the Registrar shall
  register the Unrestricted Definitive Notes pursuant to the instructions from
  the Holder thereof.

           (f) Exchange Offer. Upon the occurrence of the Exchange Offer in
accordance with the Registration Rights Agreement, the Company shall issue and,
upon receipt of an Authentication Order in accordance with Section 2.02, the
Trustee shall authenticate (i) one or more Unrestricted Global Notes in an
aggregate principal amount equal to the principal amount of the beneficial
interests in the Restricted Global Notes tendered for acceptance by Persons that
certify in the applicable Letters of Transmittal that (x) they are not broker-
dealers, (y) they are not participating in a distribution of the Exchange Notes
and (z) they are not affiliates (as defined in Rule 144) of the Company, and
accepted for exchange in the Exchange Offer and (ii) Definitive Notes in an
aggregate principal amount equal to the principal amount of the Restricted
Definitive Notes accepted for exchange in the Exchange Offer. Concurrently with
the issuance of such Notes, the Trustee shall cause the aggregate principal
amount of the applicable Restricted Global Notes to be reduced accordingly, and
the Company shall execute and the Trustee shall authenticate and deliver to the
Persons designated by the Holders of Definitive Notes so accepted Definitive
Notes in the appropriate principal amount.

           (g) Legends. The following legends shall appear on the face of all
Global Notes and Definitive Notes issued under this Indenture unless
specifically stated otherwise in the applicable provisions of this Indenture.

     (i)   Private Placement Legend.

           (A) Except as permitted by subparagraph (B) below, each Global Note
       and each Definitive Note (and all Notes issued in exchange therefor or
       substitution thereof) shall bear the legend in substantially the
       following form.

     "THE SECURITY (OR ITS PREDECESSOR) EVIDENCED HEREBY WAS ORIGINALLY ISSUED
     IN A TRANSACTION EXEMPT FROM REGISTRATION UNDER SECTION 5 OF THE UNITED
     STATES SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND THE
     SECURITY EVIDENCED HEREBY MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED
     IN THE ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM.
     EACH PURCHASER OF THE SECURITY EVIDENCED HEREBY IS HEREBY NOTIFIED THAT THE
     SELLER MAY BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF
     THE SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER.  THE HOLDER OF THE
     SECURITY EVIDENCED HEREBY AGREES FOR THE BENEFIT OF THE COMPANY THAT (A)
     SUCH SECURITY MAY BE RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (1)(a)
     TO A PERSON WHO THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL
     BUYER (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) IN A TRANSACTION
     MEETING THE REQUIREMENTS OF RULE 144A, (b) IN A TRANSACTION MEETING THE
     REQUIREMENTS OF RULE 144 UNDER THE SECURITIES ACT, (c) OUTSIDE THE UNITED
     STATES TO A FOREIGN PERSON IN A TRANSACTION MEETING THE REQUIREMENTS OF
     RULE 904 UNDER THE SECURITIES ACT OR (d) IN ACCORDANCE WITH ANOTHER
     EXEMPTION FROM

                                      29
<PAGE>
 
     THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT (AND BASED UPON AN
     OPINION OF COUNSEL IF THE COMPANY SO REQUESTS), (2) TO THE COMPANY OR (3)
     PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT AND, IN EACH CASE, IN
     ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED
     STATES OR ANY OTHER APPLICABLE JURISDICTION AND (B) THE HOLDER WILL, AND
     EACH SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER FROM IT OF THE
     SECURITY EVIDENCED HEREBY OF THE RESALE RESTRICTIONS SET FORTH IN (A)
     ABOVE."

           (B) Notwithstanding the foregoing, any Global Note or Definitive Note
       issued pursuant to subparagraphs (b)(iv), (c)(ii), (c)(iii), (d)(ii),
       (d)(iii), (e)(ii), (e)(iii) or (f) to this Section 2.06 (and all Notes
       issued in exchange therefor or substitution thereof) shall not bear the
       Private Placement Legend.

     (ii)  Global Note Legend. Each Global Note shall bear a legend in
  substantially the following form:

     "THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THIS INDENTURE
     GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE
     BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY
     CIRCUMSTANCES EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS
     MAY BE REQUIRED PURSUANT TO SECTION 2.07 OF THIS INDENTURE, (II) THIS
     GLOBAL NOTE MAY BE EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION
     2.06(a) OF THIS INDENTURE, (III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE
     TRUSTEE FOR CANCELLATION PURSUANT TO SECTION 2.11 OF THIS INDENTURE AND
     (IV) THIS GLOBAL NOTE MAY BE TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE
     PRIOR WRITTEN CONSENT OF THE COMPANY."

     (iii) Regulation S Temporary Global Note Legend. The Regulation S
  Temporary Global Note shall bear a legend in substantially the following form:

     "THE RIGHTS ATTACHING TO THIS REGULATION S TEMPORARY GLOBAL NOTE, AND THE
     CONDITIONS AND PROCEDURES GOVERNING ITS EXCHANGE FOR CERTIFICATED NOTES,
     ARE AS SPECIFIED IN THIS INDENTURE (AS DEFINED HEREIN).  NEITHER THE HOLDER
     NOR THE BENEFICIAL OWNERS OF THIS REGULATIONS TEMPORARY GLOBAL NOTE SHALL
     BE ENTITLED TO RECEIVE PAYMENT OF INTEREST HEREON."

     (iv)  Original Issue Discount Legend.  Each Note shall bear a legend in
  substantially the following form:

     "FOR THE PURPOSES OF SECTIONS 1272, 1273 AND 1275 OF THE INTERNAL REVENUE
     CODE OF 1986, AS AMENDED, THIS SECURITY IS BEING ISSUED WITH ORIGINAL ISSUE
     DISCOUNT; FOR EACH $1,000 PRINCIPAL AMOUNT OF THIS SECURITY, THE ISSUE
     PRICE IS $97.65, THE AMOUNT OF ORIGINAL ISSUE DISCOUNT IS $933.60, THE
     ISSUE DATE IS NOVEMBER 25, 1997 AND THE YIELD TO MATURITY IS 10 5/8% PER
     ANNUM."

                                      30
<PAGE>
 
           (h) Cancellation and/or Adjustment of Global Notes.

           At such time as all beneficial interests in a particular Global Note
have been exchanged for Definitive Notes or a particular Global Note has been
redeemed, repurchased or canceled in whole and not in part, each such Global
Note shall be returned to or retained and canceled by the Trustee in accordance
with Section 2.11 hereof.  At any time prior to such cancellation, if any
beneficial interest in a Global Note is exchanged for or transferred to a Person
who will take delivery thereof in the form of a beneficial interest in another
Global Note or for Definitive Notes, the principal amount of Notes represented
by such Global Note shall be reduced accordingly and an endorsement shall be
made on such Global Note by the Trustee or by the Depositary at the direction of
the Trustee to reflect such reduction; and if the beneficial interest is being
exchanged for or transferred to a Person who will take delivery thereof in the
form of a beneficial interest in another Global Note, such other Global Note
shall be increased accordingly and an endorsement shall be made on such Global
Note by the Trustee or by the Depositary at the direction of the Trustee to
reflect such increase.

           (i) General Provisions Relating to Transfers and Exchanges.

     (i)   To permit registrations of transfers and exchanges, the Company shall
  execute and the Trustee shall authenticate Global Notes and Definitive Notes
  upon the Company's order or at the Registrar's request.

     (ii)  No service charge shall be made to a holder of a beneficial interest
  in a Global Note or to a Holder of a Definitive Note for any registration of
  transfer or exchange, but the Company may require payment of a sum sufficient
  to cover any transfer tax or similar governmental charge payable in connection
  therewith (other than any such transfer taxes or similar governmental charge
  payable upon exchange or transfer pursuant to Sections 2.10, 3.06, 3.09, 4.10,
  4.15 and 9.05 hereof).

     (iii) The Registrar shall not be required to register the transfer of or
  exchange any Note selected for redemption in whole or in part, except the
  unredeemed portion of any Note being redeemed in part.

     (iv)  All Global Notes and Definitive Notes issued upon any registration of
  transfer or exchange of Global Notes or Definitive Notes shall be the valid
  obligations of the Company, evidencing the same debt, and entitled to the same
  benefits under this Indenture, as the Global Notes or Definitive Notes
  surrendered upon such registration of transfer or exchange.

     (v)   The Company shall not be required (A) to issue, to register the
  transfer of or to exchange any Notes during a period beginning at the opening
  of business 15 days before the day of any selection of Notes for redemption
  under Section 3.02 hereof and ending at the close of business on the day of
  selection, (B) to register the transfer of or to exchange any Note so selected
  for redemption in whole or in part, except the unredeemed portion of any Note
  being redeemed in part or (c) to register the transfer of or to exchange a
  Note between a record date and the next succeeding Interest Payment Date.

     (vi)  Prior to due presentment for the registration of a transfer of any
  Note, the Trustee, any Agent and the Company may deem and treat the Person in
  whose name any Note is registered as the absolute owner of such Note for the
  purpose of receiving payment of principal of and interest

                                      31
<PAGE>
 
  on such Notes and for all other purposes, and none of the Trustee, any Agent
  or the Company shall be affected by notice to the contrary.

     (vii)  The Trustee shall authenticate Global Notes and Definitive Notes in
  accordance with the provisions of Section 2.02 hereof.

     (viii) All certifications, certificates and Opinions of Counsel required
  to be submitted to the Registrar pursuant to this Section 2.06 to effect a
  registration of transfer or exchange may be submitted by facsimile.

Section 2.07.  Replacement Notes

            If any mutilated Note is surrendered to the Trustee or the Company
and the Trustee receives evidence to its satisfaction of the destruction, loss
or theft of any Note, the Company shall issue and the Trustee, upon receipt of
an Authentication Order, shall authenticate a replacement Note if the Trustee's
requirements are met. If required by the Trustee or the Company, an indemnity
bond must be supplied by the Holder that is sufficient in the judgment of the
Trustee and the Company to protect the Company, the Trustee, any Agent and any
authenticating agent from any loss that any of them may suffer if a Note is
replaced. The Company may charge for its expenses in replacing a Note.

            Every replacement Note is an additional obligation of the Company
and shall be entitled to all of the benefits of this Indenture equally and
proportionately with all other Notes duly issued hereunder.

Section 2.08.  Outstanding Notes.

            The Notes outstanding at any time are all the Notes authenticated by
the Trustee except for those canceled by it, those delivered to it for
cancellation, those reductions in the interest in a Global Note effected by the
Trustee in accordance with the provisions hereof, and those described in this
Section as not outstanding. Except as set forth in Section 2.09 hereof, a Note
does not cease to be outstanding because the Company or an Affiliate of the
Company holds the Note; however, Notes held by the Company or a Subsidiary of
the Company shall not be deemed to be outstanding for purposes of Section
3.07(b) hereof.

            If a Note is replaced pursuant to Section 2.07 hereof, it ceases to
be outstanding unless the Trustee receives proof satisfactory to it that the
replaced Note is held by a bona fide purchaser.

            If the principal amount of any Note is considered paid under Section
4.01 hereof, it ceases to be outstanding and interest on it ceases to accrue.

            If the Paying Agent (other than the Company, a Subsidiary or an
Affiliate of any thereof) holds, on a redemption date or maturity date, money
sufficient to pay Notes payable on that date, then on and after that date such
Notes shall be deemed to be no longer outstanding and shall cease to accrue
interest.

Section 2.09.  Treasury Notes.

            In determining whether the Holders of the required principal amount
of Notes have concurred in any direction, waiver or consent, Notes owned by the
Company, or by any Person

                                      32
<PAGE>
 
directly or indirectly controlling or controlled by or under direct or indirect
common control with the Company, shall be considered as though not outstanding,
except that for the purposes of determining whether the Trustee shall be
protected in relying on any such direction, waiver or consent, only Notes that
the Trustee knows are so owned shall be so disregarded.

Section 2.10.  Temporary Notes

            Until certificates representing Notes are ready for delivery, the
Company may prepare and the Trustee, upon receipt of an Authentication Order,
shall authenticate temporary Notes. Temporary Notes shall be substantially in
the form of certificated Notes but may have variations that the Company
considers appropriate for temporary Notes and as shall be reasonably acceptable
to the Trustee. Without unreasonable delay, the Company shall prepare and the
Trustee shall authenticate definitive Notes in exchange for temporary Notes.

            Holders of temporary Notes shall be entitled to all of the benefits
of this Indenture.

Section 2.11.  Cancellation.

            The Company at any time may deliver Notes to the Trustee for
cancellation. The Registrar and Paying Agent shall forward to the Trustee any
Notes surrendered to them for registration of transfer, exchange or payment. The
Trustee and no one else shall cancel all Notes surrendered for registration of
transfer, exchange, payment, replacement or cancellation and shall destroy
canceled Notes (subject to the record retention requirement of the Exchange
Act). Certification of the destruction of all canceled Notes shall be delivered
to the Company. The Company may not issue new Notes to replace Notes that it has
paid or that have been delivered to the Trustee for cancellation.

Section 2.12.  Defaulted Interest.

            If the Company defaults in a payment of interest on the Notes, it
shall pay the defaulted interest in any lawful manner plus, to the extent
lawful, interest payable on the defaulted interest, to the Persons who are
Holders on a subsequent special record date, in each case at the rate provided
in the Notes and in Section 4.01 hereof. The Company shall notify the Trustee in
writing of the amount of defaulted interest proposed to be paid on each Note and
the date of the proposed payment. The Company shall fix or cause to be fixed
each such special record date and payment date, provided that no such special
record date shall be less than 10 days prior to the related payment date for
such defaulted interest. At least 15 days before the special record date, the
Company (or, upon the written request of the Company, the Trustee in the name
and at the expense of the Company) shall mail or cause to be mailed to Holders a
notice that states the special record date, the related payment date and the
amount of such interest to be paid.

                                  ARTICLE 3.
                           REDEMPTION AND PREPAYMENT

Section 3.01.  Notices to Trustee.

            If the Company elects to redeem Notes pursuant to the optional
redemption provisions of Section 3.07 hereof, it shall furnish to the Trustee,
at least 30 days but not more than 60 days before a redemption date, an
Officers' Certificate setting forth (i) the clause of this Indenture pursuant to

                                      33
<PAGE>
 
which the redemption shall occur, (ii) the redemption date, (iii) the principal
amount of Notes to be redeemed and (iv) the redemption price (expressed as a
percentage or principal amount).

Section 3.02.  Selection of Notes to Be Redeemed

               If less than all of the Notes are to be redeemed or purchased in
an offer to purchase at any time, the Trustee shall select the Notes to be
redeemed or purchased among the Holders of the Notes in compliance with the
requirements of the principal national securities exchange, if any, on which the
Notes are listed or, if the Notes are not so listed, on a pro rata basis, by lot
or in accordance with any other method the Trustee shall deem fair and
appropriate; provided that no Notes of $1,000 or less shall be redeemed in part.
In the event of partial redemption by lot, the particular Notes to be redeemed
shall be selected, unless otherwise provided herein, not less than 30 nor more
than 60 days prior to the redemption date by the Trustee from the outstanding
Notes not previously called for redemption.

               The Trustee shall promptly notify the Company in writing of the
Notes selected for redemption and, in the case of any Note selected for partial
redemption, the principal amount thereof to be redeemed. Notes and portions of
Notes selected shall be in amounts of $1,000 or whole multiples of $1,000;
except that if all of the Notes of a Holder are to be redeemed, the entire
outstanding amount of Notes held by such Holder, even if not a multiple of
$1,000, shall be redeemed. Except as provided in the preceding sentence,
provisions of this Indenture that apply to Notes called for redemption also
apply to portions of Notes called for redemption.

Section 3.03.  Notice of Redemption

               Subject to the provisions of Section 3.09 hereof, at least 30
days but not more than 60 days before a redemption date, the Company shall mail
or cause to be mailed, by first class mail, a notice of redemption to each
Holder whose Notes are to be redeemed at its registered address.

               The notice shall identify the Notes to be redeemed and shall
state:

               (a)  the redemption date;

               (b)  the redemption price;

               (c)  if any Note is being redeemed in part, the portion of the
principal amount of such Note to be redeemed and that, after the redemption date
upon surrender of such Note, a new Note or Notes in principal amount equal to
the unredeemed portion shall be issued upon cancellation of the original Note;

               (d)  the name and address of the Paying Agent;

               (e)  that Notes called for redemption must be surrendered to the
Paying Agent to collect the redemption price;

               (f)  that, unless the Company defaults in making such redemption
payment, interest on Notes called for redemption ceases to accrue on and after
the redemption date;

                                      34
<PAGE>
 
               (g)  the paragraph of the Notes and/or Section of this Indenture
pursuant to which the Notes called for redemption are being redeemed; and

               (h)  that no representation is made as to the correctness or
accuracy of the CUSIP number, if any, listed in such notice or printed on the
Notes.

               At the Company's request, the Trustee shall give the notice of
redemption in the Company's name and at its expense; provided, however, that the
Company shall have delivered to the Trustee, at least 45 days prior to the
redemption date, an Officers' Certificate requesting that the Trustee give such
notice and setting forth the information to be stated in such notice as provided
in the preceding paragraph.

Section 3.04.  Effect of Notice of Redemption

               Once notice of redemption is mailed in accordance with Section
3.03 hereof, Notes called for redemption become irrevocably due and payable on
the redemption date at the redemption price. A notice of redemption may not be
conditional.

Section 3.05.  Deposit of Redemption Price

               One Business Day prior to the redemption date, the Company shall
deposit with the Trustee or with the Paying Agent money sufficient to pay the
redemption price of and accrued interest on all Notes to be redeemed on that
date. The Trustee or the Paying Agent shall promptly return to the Company any
money deposited with the Trustee or the Paying Agent by the Company in excess of
the amounts necessary to pay the redemption price of, and accrued interest on,
all Notes to be redeemed.

               If the Company complies with the provisions of the preceding
paragraph, on and after the redemption date, interest shall cease to accrue on
the Notes or the portions of Notes called for redemption. If a Note is redeemed
on or after an interest record date but on or prior to the related interest
payment date, then any accrued and unpaid interest shall be paid to the Person
in whose name such Note was registered at the close of business on such record
date. If any Note called for redemption shall not be so paid upon surrender for
redemption because of the failure of the Company to comply with the preceding
paragraph, interest shall be paid on the unpaid principal, from the redemption
date until such principal is paid, and to the extent lawful on any interest not
paid on such unpaid principal, in each case at the rate provided in the Notes
and in Section 4.01 hereof.

Section 3.06.  Notes Redeemed in Part.

               Upon surrender of a Note that is redeemed in part, the Company
shall issue and, upon the Company's written request, the Trustee shall
authenticate for the Holder at the expense of the Company a new Note equal in
principal amount to the unredeemed portion of the Note surrendered.

                                      35
<PAGE>
 
Section 3.07.  Optional Redemption.

               (a) Except as set forth in clause (b) of this Section 3.07, the
Company shall not have the option to redeem the Notes pursuant to this Section
3.07 prior to November 15, 2002. Thereafter, the Company shall have the option
to redeem the Notes, in whole or in part, at the redemption prices (expressed as
percentages of principal amount) set forth below plus accrued and unpaid
interest and Liquidated Damages thereon, if any, to the applicable redemption
date (subject to the right of Holders of record on the relevant record date to
receive interest and Liquidated Damages due on the relevant interest payment
date), if redeemed during the twelve-month period beginning on November 15 of
the years indicated below:

<TABLE>
<CAPTION>
               YEAR                        PERCENTAGE
               ----                        ----------
               <S>                         <C>       
               2002......................    105.313%
               2003......................    103.542 
               2004......................    101.771 
               2005 and thereafter.......    100.000  
</TABLE>

               (b) Notwithstanding the provisions of clause (a) of this Section
3.07, during the first 36 months after the date of original issuance of the
Notes, the Company may on any one or more occasions redeem up to 35% of the
aggregate principal amount at maturity of Notes originally issued at a
redemption price equal to 110.625% of the Accreted Value thereof on the
redemption date, plus Liquidated Damages thereon, if any, to the redemption date
(subject to the right of Holders of record on the relevant record date to
receive Liquidated Damages, if any, due on the relevant interest payment date),
with the net cash proceeds of one or more Public Equity Offerings and/or
Strategic Equity Investments; provided that at least 65% of the aggregate
principal amount at maturity of Notes originally issued remains outstanding
immediately after the occurrence of such redemption (excluding Notes held by the
Company or any of its Subsidiaries);and provided, further, that such redemption
shall occur within 60 days of the date of the closing of such Public Equity
Offering and/or Strategic Equity Investment.

               (c) Any redemption pursuant to this Section 3.07 shall be made
pursuant to the provisions of Section 3.01 through 3.06 hereof.

Section 3.08.  Mandatory Redemption.

               The Company shall not be required to make mandatory redemption or
sinking fund payments with respect to the Notes.

Section 3.09.  Offer to Purchase by Application of Excess Proceeds.

               In the event that, pursuant to Section 4.10 hereof, the Company
shall be required to commence an offer to holders of Notes and Pari Passu Notes
(an "Asset Sale Offer") to purchase the maximum principal amount (or accreted
value, as applicable, of Notes and Pari Passu Notes that may be purchased out of
Excess Proceeds), of Notes and Pari Passu Notes it shall follow the procedures
specified below.

               The Asset Sale Offer shall remain open for a period of 20
Business Days following its commencement and no longer, except to the extent
that a longer period is required by applicable law (the "Offer Period"). No
later than five Business Days after the termination of the Offer Period (the

                                      36
<PAGE>
 
"Purchase Date"), the Company shall purchase the principal amount (or accreted
value, as applicable) of Notes and Pari Passu Notes required to be purchased
pursuant to Section 4.10 hereof (on a pro rata basis if Notes and Pari Passu
Notes tendered are in excess of the Excess Proceeds) (which maximum principal
amount of Notes shall be the "Offer Amount") or, if less than the Offer Amount
has been tendered, all Notes and Pari Passu Notes tendered in response to the
Asset Sale Offer. Payment for any Notes so purchased shall be made in the same
manner as interest payments are made.

               If the Purchase Date is on or after an interest record date and
on or before the related interest payment date, any accrued and unpaid interest
shall be paid to the Person in whose name a Note is registered at the close of
business on such record date, and no additional interest shall be payable to
Holders who tender Notes pursuant to the Asset Sale Offer.

               Upon the commencement of an Asset Sale Offer, the Company shall
send, by first class mail, a notice to the Trustee and each of the Holders, with
a copy to the Trustee. The notice shall contain all instructions and materials
necessary to enable such Holders to tender Notes pursuant to the Asset Sale
Offer. The Asset Sale Offer shall be made to all Holders. The notice, which
shall govern the terms of the Asset Sale Offer, shall state:

               (a) that the Asset Sale Offer is being made pursuant to this
Section 3.09 and Section 4.10 hereof and the length of time the Asset Sale Offer
shall remain open;

               (b) the Offer Amount, the purchase price and the Purchase Date;

               (c) that any Note not tendered or accepted for payment shall
continue to accrete or accrue interest;

               (d) that, unless the Company defaults in making such payment, any
Note accepted for payment pursuant to the Asset Sale Offer shall cease to
accrete or accrue interest after the Purchase Date;

               (e) that Holders electing to have a Note purchased pursuant to an
Asset Sale Offer may only elect to have all of such Note purchased and may not
elect to have only a portion of such Note purchased;

               (f) that Holders electing to have a Note purchased pursuant to
any Asset Sale Offer shall be required to surrender the Note, with the form
entitled "Option of Holder to Elect Purchase" on the reverse of the Note
completed, or transfer by book-entry transfer, to the Company, a depositary, if
appointed by the Company, or a Paying Agent at the address specified in the
notice at least three days before the Purchase Date;

               (g) that Holders shall be entitled to withdraw their election if
the Company, the depositary or the Paying Agent, as the case may be, receives,
not later than the expiration of the Offer Period, a telegram, telex, facsimile
transmission or letter setting forth the name of the Holder, the principal
amount of the Note the Holder delivered for purchase and a statement that such
Holder is withdrawing his election to have such Note purchased;

               (h) that, if the aggregate principal amount (or accreted value,
as applicable) of Notes and Pari Passu Notes tendered by Holders exceeds the
Offer Amount, the Company shall select the Notes to be purchased on a pro rata
basis (with such adjustments as may be deemed appropriate by 

                                      37
<PAGE>
 
the Company so that only Notes in denominations of $1,000, or integral multiples
thereof, shall be purchased and Pari Passu Notes); and

               (i) that Holders whose Notes were purchased only in part shall be
issued new Notes equal in principal amount to the unpurchased portion of the
Notes surrendered (or transferred by book-entry transfer).

               On or before the Purchase Date, the Company shall, to the extent
lawful, accept for payment, on a pro rata basis to the extent necessary, the
Offer Amount of Notes or portions thereof tendered pursuant to the Asset Sale
Offer, or if less than the Offer Amount has been tendered, all Notes, Pari Passu
Notes or portions thereof tendered, and shall deliver to the Trustee an
Officers' Certificate stating that such Notes, and Pari Passu Notes or portions
thereof were accepted for payment by the Company in accordance with the terms of
this Section 3.09.  The Company, the Depositary or the Paying Agent, as the case
may be, shall promptly (but in any case not later than five days after the
Purchase Date) mail or deliver to each tendering Holder an amount equal to the
purchase price of the Notes tendered by such Holder and accepted by the Company
for purchase, and the Company shall promptly issue a new Note, and the Trustee,
upon written request from the Company shall authenticate and mail or deliver
such new Note to such Holder, in a principal amount equal to any unpurchased
portion of the Note surrendered.  Any Note not so accepted shall be promptly
mailed or delivered by the Company to the Holder thereof.  The Company shall
publicly announce the results of the Asset Sale Offer on the Purchase Date.

               Other than as specifically provided in this Section 3.09, any
purchase pursuant to this Section 3.09 shall be made pursuant to the provisions
of Sections 3.01 through 3.06 hereof.

                                  ARTICLE 4.
                                  COVENANTS

Section 4.01.  Payment of Notes.

               The Company shall pay or cause to be paid the principal of,
premium, if any, and interest and Liquidated Damages, if any, on the Notes on
the dates and in the manner provided in the Notes. Principal, premium, if any,
interest and Liquidated Damages, if any, shall be considered paid on the date
due if the Paying Agent, if other than the Company or a Subsidiary thereof,
holds as of 10:00 a.m. Eastern Time on the due date money deposited by the
Company in immediately available funds and designated for and sufficient to pay
all principal, premium, if any, interest and Liquidated Damages, if any, then
due. The Company shall pay all Liquidated Damages, if any, in the same manner on
the dates and in the amounts set forth in the Registration Rights Agreement.

               The Company shall pay interest (including post-petition interest
in any proceeding under any Bankruptcy Law) on overdue principal at the rate
equal to 1% per annum in excess of the then applicable interest rate on the
Notes to the extent lawful; it shall pay interest (including post-petition
interest in any proceeding under any Bankruptcy Law) on overdue installments of
interest and Liquidated Damages (without regard to any applicable grace period)
at the same rate to the extent lawful.

                                      38
<PAGE>
 
Section 4.02.  Maintenance of Office or Agency.

               The Company shall maintain in the Borough of Manhattan, the City
of New York, an office or agency (which may be an office of the Trustee or an
affiliate of the Trustee, Registrar or co-registrar) where Notes may be
surrendered for registration of transfer or for exchange and where notices and
demands to or upon the Company in respect of the Notes and this Indenture may be
served. The Company shall give prompt written notice to the Trustee of the
location, and any change in the location, of such office or agency. If at any
time the Company shall fail to maintain any such required office or agency or
shall fail to furnish the Trustee with the address thereof, such presentations,
surrenders, notices and demands may be made or served at the Corporate Trust
Office of the Trustee.

               The Company may also from time to time designate one or more
other offices or agencies where the Notes may be presented or surrendered for
any or all such purposes and may from time to time rescind such designations;
provided, however, that no such designation or rescission shall in any manner
relieve the Company of its obligation to maintain an office or agency in the
Borough of Manhattan, the City of New York for such purposes. The Company shall
give prompt written notice to the Trustee of any such designation or rescission
and of any change in the location of any such other office or agency.

               The Company hereby designates the Corporate Trust Office of the
Trustee as one such office or agency of the Company in accordance with Section
2.03.

Section 4.03.  Reports.

               (a) Whether or not required by the rules and regulations of the
SEC, so long as any Notes are outstanding, the Company shall furnish to the
Holders of Notes (i) all quarterly and annual financial information that would
be required to be contained in a filing with the SEC on Forms 10-Q and 10-K if
the Company were required to file such forms, including a "Management's
Discussion and Analysis of Financial Condition and Results of Operations" that
describes the financial condition and results of operations of the Company and
its consolidated Subsidiaries (showing in reasonable detail, in the footnotes to
the financial statements and in "Management's Discussion and Analysis of
Financial Condition and Results of Operations" (in each case to the extent not
prohibited by the SEC's rules and regulations), (A) the financial condition and
results of operations of the Company and its Restricted Subsidiaries separate
from the financial condition and results of operations of the Unrestricted
Subsidiaries of the Company and (B) the Tower Cash Flow for the most recently
completed fiscal quarter and the Adjusted Consolidated Cash Flow for the most
recently completed four-quarter period) and, with respect to the annual
information only, a report thereon by the Company's certified independent
accountants and (ii) all current reports that would be required to be filed with
the SEC on Form 8-K if the Company were required to file such reports, in each
case within the time periods specified in the SEC's rules and regulations. In
addition, following consummation of the exchange offer contemplated by the
Registration Rights Agreement, whether or not required by the rules and
regulations of the SEC, the Company shall file a copy of all such information
and reports with the SEC for public availability within the time periods
specified in the SEC's rules and regulations (unless the SEC will not accept
such a filing) and make such information available to securities analysts and
prospective investors upon request. The Company shall at times comply with TIA
(S) 314(a).

                                      39
<PAGE>
 
               (b) For so long as any Notes remain outstanding, the Company
shall furnish to the Holders and to securities analysts and prospective
investors, upon their request, the information required to be delivered pursuant
to Rule 144A(d)(4) under the Securities Act.

Section 4.04.  Compliance Certificate.

               (a) The Company shall deliver to the Trustee, within 90 days
after the end of each fiscal year, an Officers' Certificate stating that a
review of the activities of the Company and its Subsidiaries during the
preceding fiscal year has been made under the supervision of the signing
Officers with a view to determining whether the Company has kept, observed,
performed and fulfilled its obligations under this Indenture, and further
stating, as to each such Officer signing such certificate, that to the best of
his or her knowledge the Company has kept, observed, performed and fulfilled
each and every covenant contained in this Indenture and is not in default in the
performance or observance of any of the terms, provisions and conditions of this
Indenture (or, if a Default or Event of Default shall have occurred, describing
all such Defaults or Events of Default of which he or she may have knowledge and
what action the Company is taking or proposes to take with respect thereto) and
that to the best of his or her knowledge no event has occurred and remains in
existence by reason of which payments on account of the principal of or
interest, if any, on the Notes is prohibited or if such event has occurred, a
description of the event and what action the Company is taking or proposes to
take with respect thereto.

               (b) So long as not contrary to the then current recommendations
of the American Institute of Certified Public Accountants, the year-end
financial statements delivered pursuant to Section 4.03(a) above shall be
accompanied by a written statement of the Company's independent public
accountants (who shall be a firm of established national reputation) that in
making the examination necessary for certification of such financial statements,
nothing has come to their attention that would lead them to believe that the
Company has violated any provisions of Article 4 or Article 5 hereof or, if any
such violation has occurred, specifying the nature and period of existence
thereof, it being understood that such accountants shall not be liable directly
or indirectly to any Person for any failure to obtain knowledge of any such
violation.

               (c) The Company shall, so long as any of the Notes are
outstanding, deliver to the Trustee, forthwith upon any Officer becoming aware
of any Default or Event of Default, an Officers' Certificate specifying such
Default or Event of Default and what action the Company is taking or proposes to
take with respect thereto.

Section 4.05.  Taxes.

               The Company shall pay, and shall cause each of its Subsidiaries
to pay, prior to delinquency, all material taxes, assessments, and governmental
levies except such as are contested in good faith and by appropriate proceedings
or where the failure to effect such payment is not adverse in any material
respect to the Holders of the Notes. No later than December 31, 1997, the
Company shall enter into a customary tax allocation agreement with its
consolidated subsidiaries providing for the allocation of tax liabilities
between the Company and such subsidiaries, and providing for payment from all
such subsidiaries to the Company of amounts necessary to permit the Company to
pay all taxes due and owing on behalf of the Company and its consolidated
subsidiaries.

                                      40
<PAGE>
 
Section 4.06.  Stay, Extension and Usury Laws.

               The Company covenants (to the extent that it may lawfully do so)
that it shall not at any time insist upon, plead, or in any manner whatsoever
claim or take the benefit or advantage of, any stay, extension or usury law
wherever enacted, now or at any time hereafter in force, that may affect the
covenants or the performance of this Indenture; and the Company (to the extent
that it may lawfully do so) hereby expressly waives all benefit or advantage of
any such law, and covenants that it shall not, by resort to any such law,
hinder, delay or impede the execution of any power herein granted to the
Trustee, but shall suffer and permit the execution of every such power as though
no such law has been enacted.

Section 4.07.  Restricted Payments.

               The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly: (i) declare or pay any dividend or make
any other payment or distribution on account of the Company's or any of its
Restricted Subsidiaries' Equity Interests (including, without limitation, any
payment in connection with any merger or consolidation involving the Company or
any of its Restricted Subsidiaries) or to the direct or indirect holders of the
Company's or any of its Restricted Subsidiaries' Equity Interests in their
capacity as such (other than dividends or distributions payable in Equity
Interests (other than Disqualified Stock) of the Company or to the Company or a
Restricted Subsidiary of the Company); (ii) purchase, redeem or otherwise
acquire or retire for value (including without limitation, in connection with
any merger or consolidation involving the Company) any Equity Interests of the
Company or any direct or indirect parent of the Company (other than any such
Equity Interests owned by the Company or any Restricted Subsidiary of the
Company); (iii) make any payment on or with respect to, or purchase, redeem,
defease or otherwise acquire or retire for value any Indebtedness that is
subordinated to the Notes, except a payment of interest or principal at Stated
Maturity; or (iv) make any Restricted Investment (all such payments and other
actions set forth in clauses (i) through (iv) above being collectively referred
to as "Restricted Payments"), unless, at the time of and after giving effect to
such Restricted Payment:

               (a) no Default shall have occurred and be continuing or would
occur as a consequence thereof; and

               (b) the Company would have been permitted to incur at least $1.00
of additional indebtedness pursuant to the Debt to Adjusted Cash Flow Ratio test
set forth in Section 4.09.; and

               (c) such Restricted Payment, together with the aggregate amount
of all other Restricted Payments made by the Company and its Restricted
Subsidiaries after the date of this Indenture (excluding Restricted Payments
permitted by clauses (ii), (iiii) and (iv) of the next succeeding paragraph), is
less than the sum without duplication of (i) 50% of the Consolidated Net Income
of the Company for the period (taken as one accounting period) from the
beginning of the first fiscal quarter commencing after the date of this
Indenture to the end of the Company's most recently ended fiscal quarter for
which internal financial statements are available at the time of such Restricted
Payment (or, if such Consolidated Net Income for such period is a deficit, less
100% of such deficit), plus (ii) 100% of the aggregate net cash proceeds
received by the Company since the date of this Indenture as a contribution to
its common equity capital or from the issue or sale of Equity Interests of the
Company (other than Disqualified Stock and except to the extent such net cash
proceeds are used to incur new Indebtedness outstanding pursuant to clause (x)
in Section 4.09) or from the issue or sale of 

                                      41
<PAGE>
 
Disqualified Stock or debt securities of the Company that have been converted 
into such Equity Interests (other than Equity Interests or Disqualified Stock or
convertible debt securities) sold to a Subsidiary of the Company and other than 
Disqualified Stock or convertible debt securities that have been converted into
Disqualified Stock), plus (iii) to the extent that any Restricted Investment
that was made after the date of this Indenture is sold for cash or otherwise
liquidated or repaid for cash, the lesser of (A) the cash return of capital with
respect to such Restricted Investment (less the cost of disposition, if any) and
(B) the initial amount of such Restricted Investment, plus (iv) to the extent
that any Unrestricted Subsidiary of the Company is designated as a Restricted
Subsidiary after the date of this Indenture, the lesser of (A) the fair market
value of the Company's Investment in such Subsidiary as of the date of such
designation, or (B) the sum of (x) the fair market of the Company's Investment
in such Subsidiary as of the date on which such Subsidiary was originally
designated as an Unrestricted Subsidiary and (y) the amount of any Investments
made in such Subsidiary subsequent to such designation (and treated as a
Restricted Payment) by the Company or any Restricted Subsidiary; provided that
in the event the Unrestricted Subsidiary designated as a Restricted Subsidiary
is CTSH, the references in clause (A) and (B) of this clause (iv) to fair market
value of the Company's Investment in such Subsidiary shall mean the amount by
which the fair market value of such Investment exceeds 34.3% of the fair market
value of CTSH as a whole, plus (v) 50% of any dividends received by the Company
or a Restricted Subsidiary after the date of this Indenture from an Unrestricted
Subsidiary of the Company, to the extent that such dividends were not otherwise
included in Consolidated Net Income of the Company for such period.

          The foregoing provisions shall not prohibit (i) the payment of any
dividend within 60 days after the date of declaration thereof, if at said date
of declaration such payment would have complied with the provisions of this
Indenture; (ii) the making of any Investment or the redemption, repurchase,
retirement, defeasance or other acquisition of any subordinated Indebtedness or
Equity Interests of the Company in exchange for, or out of the net cash proceeds
of the substantially concurrent sale (other than to a Subsidiary of the Company)
of, any Equity Interests of the Company (other than any Disqualified Stock;
provided that such net cash proceeds are not used to incur new Indebtedness
pursuant to clause (x) in Section 4.09); and provided further that, in each such
case, the amount of any such net cash proceeds that are so utilized shall be
excluded from clause (c) (ii) of the preceding paragraph; (iii) the defeasance,
redemption, repurchase or other acquisition of subordinated Indebtedness with
the net cash proceeds from an incurrence of Permitted Refinancing Indebtedness;
or (iv) the designation of CTSH as an Unrestricted Subsidiary immediately
following the Roll-Up.

          The Board of Directors may designate any Restricted Subsidiary to be
an Unrestricted Subsidiary if such designation would not cause a Default;
provided that in no event shall the businesses operated by the Company's
Restricted Subsidiaries as of the date of this Indenture be transferred to or
held by an Unrestricted Subsidiary.  For purposes of making such determination,
all outstanding Investments by the Company and its Restricted Subsidiaries
(except to the extent repaid in cash) in the Subsidiary so designated shall be
deemed to be Restricted Payments at the time of such designation and shall
reduce the amount available for Restricted Payments under the first paragraph of
this covenant.  All such outstanding Investments will be deemed to constitute
Investments in an amount equal to the fair market value of such Investments at
the time of such designation.  Such designation will only be permitted if such
Restricted Payment would be permitted at such time and if such Restricted
Subsidiary otherwise meets the definition of an Unrestricted Subsidiary.  The
Board of Directors may designate any Unrestricted Subsidiary to be a Restricted
Subsidiary if such designation would not cause a Default.

                                      42
<PAGE>
 
          The amount of all Restricted Payments (other than cash) shall be the
fair market value on the date of the Restricted Payment of the asset(s) or
securities proposed to be transferred or issued by the Company or the applicable
Restricted Subsidiary, as the case may be, pursuant to the Restricted Payment.
The fair market value of any property, assets or Investments required by this
covenant shall be determined by the Board of Directors whose resolution with
respect thereto shall be delivered to the Trustee.

Section 4.08.  Dividend and Other Payment Restrictions Affecting Subsidiaries.

          The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create or otherwise cause or suffer to
exist or become effective any encumbrance or restriction on the ability of any
Restricted Subsidiary to (i)(a) pay dividends or make any other distributions to
the Company or any of its Restricted Subsidiaries (1) on its Capital Stock or
(2) with respect to any other interest or participation in, or measured by, its
profits, or (b) pay any indebtedness owed to the Company or any of its
Restricted Subsidiaries, (ii) make loans or advances to the Company or any of
its Restricted Subsidiaries or (iii) transfer any of its properties or assets to
the Company or any of its Restricted Subsidiaries. However, the foregoing
restrictions shall not apply to encumbrances or restrictions existing under or
by reason of (a) Existing Indebtedness as in effect on the date of this
Indenture or Indebtedness under the Senior Credit Facility, and any amendments,
modifications, restatements, renewals, increases, supplements, refundings,
replacements or refinancings thereof; provided that such amendments,
modifications, restatements, renewals, increases, supplements, refundings,
replacements or refinancings are no more restrictive, taken as a whole, with
respect to such dividend and other payment restrictions than those contained in
the applicable series of Existing Indebtedness as in effect on the date of this
Indenture or in the Senior Credit Facility, (b) encumbrances and restrictions
applicable to CTSH and its Subsidiaries, as the same are in effect as of the
date on which CTSH becomes a Restricted Subsidiary, and as the same may be
amended, modified, restated, renewed, increased, supplemented, refunded,
replaced or refinanced; provided that such amendments, modifications,
restatements, renewals, increases, supplements, refundings, replacement or
refinancings are no more restrictive, taken as a whole, with respect to such
dividend and other payment restrictions than those contained in the applicable
series of Indebtedness of CTSH as in effect on the date on which CTSH becomes a
Restricted Subsidiary, (c) this Indenture and the Notes, (d) applicable law, (e)
any instrument governing Indebtedness or Capital Stock of a Person acquired by
the Company or any of its Restricted Subsidiaries as in effect at the time of
such acquisition (except to the extent such Indebtedness was incurred in
connection with or in contemplation of such acquisition), which encumbrance or
restriction is not applicable to any Person, or the properties or assets of any
Person, other than the Person, or the property or assets of the Person, so
acquired, provided that, in the case of Indebtedness, such Indebtedness was
permitted by the terms of this Indenture to be incurred, (f) by reason of
customary non-assignment provisions in leases or licenses entered into in the
ordinary course of business, (g) purchase money obligations for property
acquired in the ordinary course of business that impose restrictions of the
nature described in clause (iii) above on the property so acquired, (h) the
provisions of agreements governing Indebtedness incurred pursuant to clause (iv)
of the second paragraph of the covenant described in Section 4.09, (i) any
agreement for the sale of a Restricted Subsidiary that restricts that Restricted
Subsidiary pending its sale, (j) Permitted Refinancing Indebtedness, provided
that the restrictions contained in the agreements governing such Permitted
Refinancing Indebtedness are no more restrictive, taken as a whole, than those
contained in the agreements governing the Indebtedness being refinanced, (k)
Liens permitted to be incurred pursuant to the provisions of the covenant
described in Section 4.12 that limit the right of the debtor to transfer the
assets subject to such Liens, (l) provisions with respect to the disposition or
distribution of assets or 

                                      43
<PAGE>
 
property in joint venture agreements and other similar agreements and (m)
restrictions on cash or other deposits or net worth imposed by customers under
contracts entered into in the ordinary course of business.

Section 4.09.  Incurrence of Indebtedness and Issuance of Preferred Stock.

          The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create, incur, issue, assume, guarantee
or otherwise become directly or indirectly liable, contingently or otherwise,
with respect to (collectively, "incur") any Indebtedness (including Acquired
Debt) and the Company shall not issue any Disqualified Stock and shall not
permit any of its Restricted Subsidiaries to issue any shares of preferred
stock; provided, however, that the Company may incur Indebtedness (including
Acquired Debt) or issue shares of Disqualified Stock and the Company's
Restricted Subsidiaries may incur Eligible Indebtedness if, in each case, (i) no
Default shall have occurred and be continuing or would occur as a consequence
thereof and (ii) the Company's Debt to Adjusted Consolidated Cash Flow Ratio at
the time of incurrence of such Indebtedness or the issuance of such Disqualified
Stock, after giving pro forma effect to such incurrence or issuance as of such
date and to the use of proceeds therefrom as if the same had occurred at the
beginning of the most recently ended four full fiscal quarter period of the
Company for which internal financial statements are available, would have been
no greater than 6.5 to 1.

          The provisions of the first paragraph of this covenant shall not apply
to the incurrence of any of the following items of Indebtedness (collectively,
"Permitted Debt") if no Default shall have occurred and be continuing or would
occur as a consequence thereof:

          (i)    the incurrence by the Company or any of its Restricted
     Subsidiaries of Indebtedness (including Indebtedness under Credit
     Facilities) in an aggregate principal amount (with letters of credit being
     deemed to have a principal amount equal to the maximum potential liability
     of the Company and its Restricted Subsidiaries thereunder) at any one time
     outstanding not to exceed the greater of (x) $100.0 million less the
     aggregate amount of all Net Proceeds of Assets Sales applied to repay
     Indebtedness under a Credit Facility pursuant to the covenant described in
     Section 4.10 and (y) 70% of the Eligible Receivables that are outstanding
     as of such date of incurrence;

          (ii)   the incurrence by the Company and its Restricted Subsidiaries
     of the Existing Indebtedness;

          (iii)  the incurrence by the Company of Indebtedness represented by
     the Notes and the New Notes;

          (iv)   the incurrence by the Company or any of its Restricted
     Subsidiaries of Indebtedness represented by Capital Lease Obligations,
     mortgage financings or purchase money obligations, in each case incurred
     for the purpose of financing all or any part of the purchase price or cost
     of construction or improvement of property, plant or equipment used in the
     business of the Company or such Restricted Subsidiary, in an aggregate
     principal amount, including all Permitted Refinancing Indebtedness incurred
     to refund, refinance or replace any other indebtedness incurred pursuant to
     this clause (iv), not to exceed $5.0 million at any time outstanding;

          (v)    the incurrence by the Company or any of its Restricted
     Subsidiaries of Permitted Refinancing Indebtedness in exchange for, or the
     net proceeds of which are used to

                                      44
<PAGE>
 
     extend, refinance, renew, replace, defease or refund Indebtedness (other
     than intercompany Indebtedness) that was permitted by this Indenture to be
     incurred under the first paragraph hereof of clauses (ii) or (iii) or this
     clause (v) of this paragraph;

          (vi)   the incurrence by the Company or any of its Restricted
     Subsidiaries of intercompany Indebtedness between or among the Company and
     any of its Restricted Subsidiaries; provided, however, that (i) if the
     Company is the obligor on such Indebtedness, such Indebtedness is expressly
     subordinated to the prior payment in full in cash of all Obligations with
     respect to the Notes and (ii) (a) any subsequent issuance or transfer of
     Equity Interests that results in any such Indebtedness being held by a
     Person other than the Company or a Restricted Subsidiary and (b) any sale
     or other transfer of any such Indebtedness to a Person that is not either
     the Company or a Restricted Subsidiary shall be deemed, in each case, to
     constitute an incurrence of such indebtedness by the Company or such
     Restricted Subsidiary, as the case may be;

          (vii)  the incurrence by the Company or any of its Restricted
     Subsidiaries of Hedging Obligations that are incurred for the purpose of
     fixing or hedging interest rate risk with respect to any floating rate
     Indebtedness that is permitted by the terms of this Section 4.09 to be
     outstanding or currency exchange risk;

          (viii) the guarantee by the Company or any of its Restricted
     Subsidiaries of Indebtedness of the Company or a Restricted Subsidiary of
     the Company that was permitted to be incurred by another provision of this
     Section 4.09;

          (ix)   the incurrence by the Company or any of its Restricted
     Subsidiaries of Acquired Debt in connection with acquisition of assets or a
     new Subsidiary and the incurrence by the Company's Restricted Subsidiaries
     of Indebtedness as a result of the designation of an Unrestricted
     Subsidiary as a Restricted Subsidiary; provided that, in the case of any
     such incurrence of Acquired Debt, such Acquired Debt was incurred by the
     prior owner of such assets or such Restricted Subsidiary prior to such
     acquisition by the Company or one of its Restricted Subsidiaries and was
     not incurred in connection with, or in contemplation of, such acquisition
     by the Company or one of its Restricted Subsidiaries; and provided further
     that, in case of any incurrence pursuant to this clause (viii), the Company
     would have been permitted to incur at least $1.00 of additional
     indebtedness (other than Permitted Debt) immediately after such incurrence
     pursuant to the Debt to Adjusted Consolidated Cash Flow Ratio test set
     forth in the first paragraph of this covenant, calculated as if such
     incurrence had occurred as of the actual date of incurrence and the related
     acquisition or designation (as applicable) had occurred at the beginning of
     the most recently ended four full fiscal quarter period of the Company for
     which internal financial statements are available;

          (x)    the incurrence by the Company of Indebtedness not to exceed, at
     any one time outstanding, 2.0 times the aggregate net cash proceeds from
     the issuance and sale, other than to a Subsidiary, of Equity Interests
     (other than Disqualified Stock) of the Company since the date of this
     Indenture (less that amount of such proceeds used to make Restricted
     Payments as provided in clause (c)(ii) of the first paragraph or clause
     (ii) of the second paragraph of the covenant described in Section 4.07);
     provided that such Indebtedness does not mature prior to the Stated
     Maturity of the Notes and the Weighted Average Life to Maturity of such
     Indebtedness is longer than that of the Notes; and

                                      45
<PAGE>
 
          (xi)   the incurrence by the Company or any of its Restricted
     Subsidiaries of additional Indebtedness in an aggregate principal amount
     (or accreted value, as applicable) at any time outstanding, not to exceed
     $5.0 million.

          The Company shall not (i) incur any Indebtedness that is contractually
subordinated to any other Indebtedness of the Company unless such Indebtedness
is also contractually subordinated to the Notes on substantially identical
terms; provided, however, that no Indebtedness of the Company shall be deemed to
be contractually subordinated in right of payment to any other Indebtedness of
the Company solely by virtue of being unsecured and (ii) the Company shall not
permit any of its Unrestricted Subsidiaries to incur any Indebtedness other than
Non-Recourse Debt.

          For purposes of determining compliance with this Section 4.09, in the
event that an item of Indebtedness meets the criteria of more than one of the
categories of Permitted Debt described in clauses (i) through (xi) above or is
entitled to be incurred pursuant to the first paragraph of this Section 4.09,
the Company shall, in its sole discretion, classify such item of Indebtedness in
any manner that complies with this Section 4.09. Accrual of interest, accretion
or amortization of original issue discount and the payment of interest in the
form of additional Indebtedness shall not be deemed to be an incurrence of
Indebtedness for purposes of this Section 4.09.

Section 4.10.  Asset Sales

          The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, consummate an Asset Sale unless (i) the Company (or the
Restricted Subsidiary, as the case may be) receives consideration at the time of
such Asset Sale at least equal to the fair market value (evidenced by a
resolution of the Board of Directors set forth in an Officers' Certificate
delivered to the Trustee) of the assets or Equity Interests issued or sold or
otherwise disposed of and (ii) except in the case of a Tower Asset Exchange, at
least 75% of the consideration therefor received by the Company or such
Restricted Subsidiary is in the form of cash or Cash Equivalents; provided that
the amount of (x) any liabilities (as shown on the Company's or such Restricted
Subsidiary's most recent balance sheet), of the Company or any Restricted
Subsidiary (other than contingent liabilities and liabilities that are by their
terms subordinated to the Notes or any guarantee thereof) that are assumed by
the transferee of any such assets pursuant to a customary novation agreement
that releases the Company or such Restricted Subsidiary from further liability
and (y) any securities, notes or other obligations received by the Company or
any such Restricted Subsidiary from such transferee that are converted by the
Company or such Restricted Subsidiary into cash within 20 days of the applicable
Asset Sale (to the extent of the cash received), shall be deemed to be cash for
purposes of this provision.

          Within 360 days after the receipt of any Net Proceeds from an Asset
Sale, the Company or the applicable Restricted Subsidiary may apply such Net
Proceeds to: (a) reduce Indebtedness under a Credit Facility; (b) reduce other
Indebtedness of any of the Company's Restricted Subsidiaries; (c) the
acquisition of all or substantially all the assets of a Permitted Business; (d)
the acquisition of Voting Stock of a Permitted Business from a Person that is
not a Subsidiary of the Company; provided, that, after giving effect thereto,
the Company or its Restricted Subsidiary owns a majority of such Voting Stock;
or (e) the making of a capital expenditure or the acquisition of other long-term
assets that are used or useful in a Permitted Business. Pending the final
application of any such Net Proceeds, the Company may temporarily reduce
revolving credit borrowings or otherwise invest such Net Proceeds in any manner
that is not prohibited by this Indenture. Any Net Proceeds from Asset Sales that
are not applied or invested as provided in the first sentence of this paragraph
shall 

                                      46
<PAGE>
 
be deemed to constitute "Excess Proceeds." When the aggregate amount of Excess
Proceeds exceeds $5.0 million, the Company shall be required to make an offer
(an "Asset Sale Offer") to all Holders of Notes and all holders of other senior
Indebtedness of the Company containing provisions similar to those set forth in
this Indenture with respect to offers to purchase or redeem with the proceeds of
sales of assets (such other senior Indebtedness of the Company, "Pari Passu
Notes") to purchase the maximum principal amount (or accreted value, as
applicable) of Notes and and Pari Passu Notes that may be purchased out of the
Excess Proceeds, at an offer price in cash in an amount equal to 100% of the
principal amount (or accreted value, as applicable) thereof plus accrued and
unpaid interest and Liquidated Damages thereon, if any, to the date of purchase
(subject to the right of Holders of record on the relevant record date to
receive interest and Liquidated Damages, if any, due on the relevant interest
payment date), in accordance with the procedures set forth in this Indenture and
any indenture governing the Pari Passu Notes. To the extent that any Excess
Proceeds remain after consummation of an Asset Sale Offer, the Company may use
such Excess Proceeds for any purpose not otherwise prohibited by this Indenture.
If the aggregate principal amount of Notes and Pari Passu Notes tendered into
such Asset Sale Offer surrendered by Holders thereof exceeds the amount of
Excess Proceeds, the Trustee shall select the Notes and Pari Passu Notes to be
purchased on a pro rata basis. Upon completion of such offer to purchase, the
amount of Excess Proceeds shall be reset at zero.

Section 4.11.  Transactions with Affiliates.

          The Company shall not, and shall not permit any of its Restricted
Subsidiaries to make any payment to, or sell, lease, transfer or otherwise
dispose of any of its properties or assets to, or purchase any property or
assets from, or enter into or make or amend any transaction, contract,
agreement, understanding, loan, advance or guarantee with, or for the benefit
of, any Affiliate (each of the foregoing, an "Affiliate Transaction"), unless
(i) such Affiliate Transaction is on terms that are no less favorable to the
Company or the relevant Restricted Subsidiary than those that would have been
obtained in a comparable transaction by the Company or such Restricted
Subsidiary with an unrelated Person and (ii) the Company delivers to the Trustee
(a) with respect to any Affiliate Transaction or series of related Affiliate
Transactions involving aggregate consideration in excess of $1.0 million, a
resolution of the Board of Directors set forth in an Officers' Certificate
certifying that such Affiliate Transaction complies with clause (i) above and
that such Affiliate Transaction has been approved by a majority of the
disinterested members of the Board of Directors and (b) with respect to any
Affiliate Transaction or series of related Affiliate Transactions involving
aggregate consideration in excess of $5.0 million, an opinion as to the fairness
to the Holders of such Affiliate Transaction from a financial point of view
issued by an accounting, appraisal or investment banking firm of national
standing.  Notwithstanding the foregoing, the following items shall not be
deemed to be Affiliate Transactions: (i) any employment arrangements with any
executive officer of the Company or a Restricted Subsidiary that is entered into
by the Company or any of its Restricted Subsidiaries in the ordinary course of
business and consistent with compensation arrangements of similarly situated
executive officers at comparable companies engaged in Permitted Businesses, (ii)
transactions between or among the Company and/or its Restricted Subsidiaries,
(iii) payment of directors fees in an aggregate annual amount not to exceed
$25,000 per Person, (iv) Restricted Payments that are permitted by the
provisions of Section 4.07, (v) the issuance or sale of Equity Interests (other
than Disqualified Stock) of the Company, and (vi) transactions pursuant to the
provisions of the Services Agreement, the Shareholders' Agreement and the
Stockholders Agreement as the same are in effect on the date hereof.

                                      47
<PAGE>
 
Section 4.12.  Liens.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create, incur, assume or suffer to
exist any Lien securing Indebtedness or trade payables on any asset now owned or
hereafter acquired, or any income or profits therefrom or assign or convey any
right to receive income therefrom, except Permitted Liens.

Section 4.13.  Business activities.

     The Company shall not, and shall not permit any Subsidiary to, engage in
any business other than Permitted Business, except to such extent as would not
be material to the Company and its Subsidiaries and its Subsidiaries taken as a
whole.

Section 4.14.  Corporate Existence.

          Subject to Article 5 hereof, the Company shall do or cause to be done
all things necessary to preserve and keep in full force and effect (i) its
corporate existence, and the corporate, partnership or other existence of each
of its Restricted Subsidiaries, in accordance with the respective organizational
documents (as the same may be amended from time to time) of the Company or any
such Restricted Subsidiary and (ii) the rights (charter and statutory), licenses
and franchises of the Company and its Subsidiaries; provided, however, that the
Company shall not be required to preserve any such right, license or franchise,
or the corporate, partnership or other existence of any of its Restricted
Subsidiaries, if the Board of Directors shall determine that the preservation
thereof is no longer desirable in the conduct of the business of the Company and
its Restricted Subsidiaries, taken as a whole, and that the loss thereof is not
adverse in any material respect to the Holders of the Notes.

Section 4.15.  Offer to Repurchase Upon Change of Control.

          (a)  Upon the occurrence of a Change of Control, each Holder of Notes
shall have the right to require the Company to repurchase all or any part (equal
to $1,000 or an integral multiple thereof) of such Holder's Notes pursuant to
the offer described below (the "Change of Control Offer") at an offer price in
cash equal to 101% of the aggregate principal amount thereof plus accrued and
unpaid interest and Liquidated Damages thereon, if any (subject to the right of
Holders of record on the relevant record date to receive interest and Liquidated
Damages, if any, due on the relevant interest payment date), to the date of
purchase or, in the case of repurchases of Notes prior to the Full Accretion
Date, at a purchase price equal to 101% of the Accreted Value thereof on the
date of repurchase plus Liquidated Damages thereon, if any (subject to the right
of Holders of record on the relevant record date to receive Liquidated Damages,
if any, due on the relevant interest payment date), to such date of repurchase
(the "Change of Control Payment"). Within 30 days following any Change of
Control, the Company shall mail a notice to each Holder stating: (i) that the
Change of Control Offer is being made pursuant to this Section 4.15 and that all
Notes tendered will be accepted for payment; (ii) the purchase price and the
purchase date, which shall be no earlier than 30 business days and no later than
60 days from the date such notice is mailed (the "Change of Control Payment
Date"); (iii) that any Note not tendered will continue to accrete or accrue
interest; (iv) that, unless the Company defaults in the payment of the Change of
Control Payment, all Notes accepted for payment pursuant to the Change of
Control Offer shall cease to accrete or accrue interest after the Change of
Control Payment Date; (v) that Holders electing to have any Notes purchased
pursuant to a Change of Control Offer will be required to surrender the Notes,
with the form entitled "Option of Holder to Elect 

                                      48
<PAGE>
 
Purchase" on the reverse of the Notes completed, to the Paying Agent at the
address specified in the notice prior to the close of business on the third
Business Day preceding the Change of Control Payment Date; (vi) that Holders
will be entitled to withdraw their election if the Paying Agent receives, not
later than the close of business on the second Business Day preceding the Change
of Control Payment Date, a telegram, telex, facsimile transmission or letter
setting forth the name of the Holder, the principal amount of Notes delivered
for purchase, and a statement that such Holder is withdrawing his election to
have the Notes purchased; and (vii) that Holders whose Notes are being purchased
only in part will be issued new Notes equal in principal amount to the
unpurchased portion of the Notes surrendered, which unpurchased portion must be
equal to $1,000 in principal amount or an integral multiple thereof. 

          (b)  On the Change of Control Payment Date, the Company shall, to the
extent lawful, (i) accept for payment all Notes or portions thereof properly
tendered pursuant to the Change of Control Offer, (ii) deposit with the Paying
Agent an amount equal to the Change of Control Payment in respect of all Notes
or portions thereof so tendered and (iii) deliver or cause to be delivered to
the Trustee the Notes so accepted together with an Officers' Certificate stating
the aggregate principal amount of Notes or portions thereof being purchased by
the Company. The Paying Agent shall promptly mail to each Holder of Notes so
tendered the Change of Control Payment for such Notes, and the Trustee shall
promptly authenticate and mail (or cause to be transferred by book entry) to
each Holder a new Note equal in principal amount to any unpurchased portion of
the Notes surrendered, if any; provided that each such new Note shall be in a
principal amount of $1,000 or an integral multiple thereof.

          (c)  The Change of Control provisions described above shall be
applicable whether or not any other provisions of this Indenture are applicable.
The Company shall comply, to the extent applicable, with the requirements of
Section 14(e) of the Exchange Act and any other securities laws or regulations
applicable to any Change of Control Offer. To the extent that the provisions of
any such securities laws or securities regulations conflict with the provisions
of the covenant described above, the Company shall comply with the applicable
securities laws and regulations and shall not be deemed to have breached its
obligations under the covenant described above by virtue thereof.

Section 4.16.  Limitation on Sale and Leaseback Transactions.

          The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, enter into any sale and leaseback transaction; provided that
the Company or any of its Restricted Subsidiaries may enter into a sale and
leaseback transaction if (i) the Company or such Restricted Subsidiary, as
applicable, could have (a) incurred Indebtedness in an amount equal to the
Attributable Debt relating to such sale and leaseback transaction pursuant to
the Debt to Adjusted Consolidated Cash Flow Ratio test set forth in the first
paragraph of the covenant described in Section 4.09 and (b) incurred a Lien to
secure such Indebtedness pursuant to the covenant described in Section 4.12,
(ii) the gross cash proceeds of such sale and leaseback transaction are at least
equal to the fair market value (as determined in good faith by the Board of
Directors) of the property that is the subject of such sale and leaseback
transaction and (iii) the transfer of assets in such sale and leaseback
transaction is permitted by, and the Company applies the proceeds of such
transaction in compliance with, the covenant described Section 4.10.

                                      49
<PAGE>
 
Section 4.17.  Limitation on Issuances and Sales of Capital Stock of Restricted
Subsidiaries.

          The Company (i) shall not, and shall not permit any Restricted
Subsidiary of the Company to, transfer, convey, sell, lease or otherwise dispose
of any Equity Interests in any Restricted Subsidiary of the Company to any
Person (other than the Company or a Wholly Owned Restricted Subsidiary of the
Company) and (ii) shall not permit any Restricted Subsidiary of the Company to
issue any of its Equity Interests (other than, if necessary, shares of its
Capital Stock constituting directors' qualifying shares) to any Person other
than to the Company or a Wholly Owned Restricted Subsidiary of the Company,
unless, in each such case: (a) as a result of such transfer, conveyance, sale,
lease or other disposition or issuance such Restricted Subsidiary no longer
constitutes a Subsidiary and (b) the cash Net Proceeds from such transfer,
conveyance, sale, lease or other disposition or issuance are applied in
accordance with the covenant described in Section 4.10.

Section 4.18.  Limitation on Issuances of Guarantees of Indebtedness.

          The Company shall not permit any Restricted Subsidiary, directly or
indirectly, to Guarantee or pledge any assets to secure the payment of any other
Indebtedness of the Company unless such Subsidiary simultaneously executes and
delivers a supplemental indenture to this Indenture providing for the Guarantee
of the payment of the Notes by such Subsidiary, which Guarantee shall be senior
to or pari passu with such Subsidiary's Guarantee of or pledge to secure such
other Indebtedness.  Notwithstanding the foregoing, any such Guarantee by a
Subsidiary of the Notes shall provide by its terms that it shall be
automatically and unconditionally released and discharged upon any sale,
exchange or transfer, to any Person other than a Subsidiary of the Company, of
all of the Company's stock in, or all or substantially all the assets of, such
Subsidiary, which sale, exchange or transfer is made in compliance with the
applicable provisions of this Indenture.  The form of such Guarantee is attached
as Exhibit D hereto.

                                   ARTICLE 5.
                                   SUCCESSORS

Section 5.01.  Merger, Consolidation or Sale of Assets.

          The Company shall not consolidate or merge with or into (whether or
not the Company is the surviving corporation), or sell, assign, transfer, lease,
convey or otherwise dispose of all or substantially all of its properties or
assets in one or more related transactions, to another corporation, Person or
entity unless (i) the Company is the surviving corporation or the entity or the
Person formed by or surviving any such consolidation or merger (if other than
the Company) or to which such sale, assignment, transfer, lease, conveyance or
other disposition shall have been made is a corporation organized or existing
under the laws of the United States, any state thereof or the District of
Columbia, (ii) the entity or Person formed by or surviving any such
consolidation or merger (if other than the Company) or the entity or Person to
which such sale, assignment, transfer, lease, conveyance or other disposition
shall have been made assumes all the obligations of the Company under the Notes
and this Indenture pursuant to a supplemental indenture in a form reasonably
satisfactory to the Trustee, (iii) immediately after such transaction, no
Default exists and (iv) except in the case of a merger of the Company with or
into a Wholly Owned Restricted Subsidiary of the Company and except in the case
of a merger entered into solely for the purpose of reincorporating the Company
in another jurisdiction, the Company or the entity or Person formed by or
surviving any such consolidation or merger (if other than the Company), or to
which such sale, assignment, transfer, lease, conveyance or other disposition

                                      50
<PAGE>
 
shall have been made shall, at the time of such transaction and after giving pro
forma effect thereto as if such transaction had occurred at the beginning of the
applicable four-quarter period, be permitted to incur at least $1.00 of
additional Indebtedness pursuant to the Debt to Adjusted Consolidated Cash Flow
Ratio test set forth in the first paragraph of the covenant described in Section
4.09.

Section 5.02.  Successor Corporation Substituted.

          Upon any consolidation or merger, or any sale, assignment, transfer,
lease, conveyance or other disposition of all or substantially all of the assets
of the Company in accordance with Section 5.01 hereof, the successor corporation
formed by such consolidation or into or with which the Company is merged or to
which such sale, assignment, transfer, lease, conveyance or other disposition is
made shall succeed to, and be substituted for (so that from and after the date
of such consolidation, merger, sale, lease, conveyance or other disposition, the
provisions of this Indenture referring to the "Company" shall refer instead to
the successor corporation and not to the Company), and may exercise every right
and power of the Company under this Indenture with the same effect as if such
successor Person had been named as the Company herein, provided, however, that
and the predecessor Company shall not be relieved from the obligation to pay the
principal of and interest on the Notes except in the case of a sale of all of
the Company's assets that meets the requirements of Section 5.01 hereof.

                                   ARTICLE 6.
                             DEFAULTS AND REMEDIES

Section 6.01.  Events of Default.

          An "Event of Default" occurs if:

          (a)  the Company defaults in the payment when due of interest on, or
Liquidated Damages with respect to, the Notes and such default continues for a
period of 30 days;

          (b)  the Company defaults in the payment when due of principal of or
premium, if any, on the Notes when the same becomes due and payable at maturity,
upon redemption (including in connection with an offer to purchase) or
otherwise;

          (c)  the Company fails to comply with any of the provisions of Section
4.10, 4.15 or 5.01 hereof;

          (d)  the Company fails to observe or perform any other covenant,
representation, warranty or other agreement in this Indenture or the Notes for
30 days after notice to the Company by the Trustee or the Holders of at least
25% in aggregate principal amount at maturity of the Notes then outstanding
voting as a single class;

          (e)  a default occurs under any mortgage, indenture or instrument
under which there may be issued or by which there may be secured or evidenced
any Indebtedness for money borrowed by the Company or any of its Significant
Subsidiaries (or the payment of which is guaranteed by the Company or any of its
Significant Subsidiaries), whether such Indebtedness or guarantee now exists, or
is created after the date of this Indenture, which default (a) is caused by a
failure to pay principal of or premium, if any, or interest on such Indebtedness
prior to the expiration of the grace period provided in such Indebtedness on the
date of such default (a "Payment Default") or (b) results in the acceleration of
such Indebtedness prior to its express maturity and, in each case, the principal

                                      51
<PAGE>
 
amount of such Indebtedness, under which there has been a Payment Default or the
maturity of which has been so accelerated, aggregates $5 million or more;

          (f)  a final judgment or final judgments for the payment of money are
entered by a court or courts of competent jurisdiction against the Company or
any of its Significant Subsidiaries or any group of Subsidiaries that, taken as
a whole, would constitute a Significant Subsidiary and such judgment or
judgments remain undischarged for a period (during which execution shall not be
effectively stayed) of 60 days, provided that the aggregate of all such
undischarged judgments exceeds $5.0 million;

          (g)  the Company or any of its Restricted Subsidiaries pursuant to or
within the meaning of Bankruptcy Law:

     (i)    commences a voluntary case,

     (ii)   consents to the entry of an order for relief against it in an
  involuntary case,

     (iii)  consents to the appointment of a Custodian of it or for all or
  substantially all of its property,

     (iv)   makes a general assignment for the benefit of its creditors, or

     (v)    generally is not paying its debts as they become due; or

          (h)  a court of competent jurisdiction enters an order or decree under
any Bankruptcy Law that:

     (i)    is for relief against the Company or any Restricted Subsidiary in an
  involuntary case;

     (ii)   appoints a Custodian of the Company or any of its Sigificant
Subsidiaries or any group of Subsidiaries that, taken as a whole, would
sonstitute a Significant Subsidiary or for all or substantially all of the
property of the Company or any of its Sigificant Subsidiaries or any group of
Subsidiaries that, taken as a whole, would sonstitute a Significant Subsidiary
;or

     (iii)  orders the liquidation of the Company or any of its Sigificant 
Subsidiaries or any group of Subsidiaries that, taken as a whole, would 
sonstitute a Significant Subsidiary;

     and the order or decree remains unstayed and in effect for 60 consecutive
     days; or

Section 6.02.  Acceleration.

          If any Event of Default (other than an Event of Default specified in
clause (g) or (h) of Section 6.01 hereof with respect to the Company, any
Significant Subsidiary or any group of Significant Subsidiaries that, taken as a
whole, would constitute a Significant Subsidiary) occurs and is continuing, the
Trustee or the Holders of at least 25% in principal amount at maturity of the
then outstanding Notes may declare all the Notes to be due and payable
immediately. Upon any such 

                                      52
<PAGE>
 
declaration, the principal of (or, if prior to the Full Accretion Date, the
Accreted Value of), if any, and accrued and unpaid interest and Liquidated
Damages, if any, shall become due and payable immediately. Notwithstanding the
foregoing, if an Event of Default specified in clause (g) or (h) of Section 6.01
hereof occurs with respect to the Company, any of its Significant Subsidiaries
or any group of Subsidiaries that, taken as a whole, would constitute a
Significant Subsidiary, shall be due and payable immediately without further
action or notice. The Holders of a majority in aggregate principal amount of the
then outstanding Notes by written notice to the Trustee may on behalf of all of
the Holders rescind an acceleration and its consequences if the rescission would
not conflict with any judgment or decree and if all existing Events of Default
(except nonpayment of principal, interest or premium that has become due solely
because of the acceleration) have been cured or waived.

Section 6.03.  Other Remedies.

          If an Event of Default occurs and is continuing, the Trustee may
pursue any available remedy to collect the payment of principal, premium, if
any, interest and Liquidated Damages, if any, on the Notes or to enforce the
performance of any provision of the Notes or this Indenture.

          The Trustee may maintain a proceeding even if it does not possess any
of the Notes or does not produce any of them in the proceeding. A delay or
omission by the Trustee or any Holder of a Note in exercising any right or
remedy accruing upon an Event of Default shall not impair the right or remedy or
constitute a waiver of or acquiescence in the Event of Default. All remedies are
cumulative to the extent permitted by law.

Section 6.04.  Waiver of Past Defaults.

          Holders of not less than a majority in aggregate principal amount of
the then outstanding Notes by notice to the Trustee may on behalf of the Holders
of all of the Notes waive an existing Default or Event of Default and its
consequences hereunder, except a continuing Default or Event of Default in the
payment of the principal of, premium and Liquidated Damages, if any, or interest
on, the Notes (including in connection with an offer to purchase) (provided,
however, that the Holders of a majority in aggregate principal amount of the
then outstanding Notes may rescind an acceleration and its consequences,
including any related payment default that resulted from such acceleration).
Upon any such waiver, such Default shall cease to exist, and any Event of
Default arising therefrom shall be deemed to have been cured for every purpose
of this Indenture; but no such waiver shall extend to any subsequent or other
Default or impair any right consequent thereon.

Section 6.05.  Control by Majority.

          Holders of a majority in principal amount at maturity of the then
outstanding Notes may direct the time, method and place of conducting any
proceeding for exercising any remedy available to the Trustee or exercising any
trust or power conferred on it.  However, the Trustee may refuse to follow any
direction that conflicts with law or this Indenture that the Trustee determines
may be unduly prejudicial to the rights of other Holders of Notes or that may
involve the Trustee in personal liability.

                                      53
<PAGE>
 
Section 6.06.  Limitation on Suits.

          A Holder of a Note may pursue a remedy with respect to this Indenture
or the Notes only if:

          (a)  the Holder of a Note gives to the Trustee written notice of a
continuing Event of Default;

          (b)  the Holders of at least 25% in principal amount at maturity of
the then outstanding Notes make a written request to the Trustee to pursue the
remedy;

          (c)  such Holder of a Note or Holders of Notes offer and, if
requested, provide to the Trustee indemnity satisfactory to the Trustee against
any loss, liability or expense;

          (d)  the Trustee does not comply with the request within 60 days after
receipt of the request and the offer and, if requested, the provision of
indemnity; and

          (e)  during such 60-day period the Holders of a majority in principal
amount at maturity of the then outstanding Notes do not give the Trustee a
direction inconsistent with the request.

          A Holder of a Note may not use this Indenture to prejudice the rights
of another Holder of a Note or to obtain a preference or priority over another
Holder of a Note.

Section 6.07.  Rights of Holders of Notes to Receive Payment.

          Notwithstanding any other provision of this Indenture, the right of
any Holder of a Note to receive payment of principal, premium and Liquidated
Damages, if any, and interest on the Note, on or after the respective due dates
expressed in the Note (including in connection with an offer to purchase), or to
bring suit for the enforcement of any such payment on or after such respective
dates, shall not be impaired or affected without the consent of such Holder.

Section 6.08.  Collection Suit by Trustee.

          If an Event of Default specified in Section 6.01(a) or (b) occurs and
is continuing, the Trustee is authorized to recover judgment in its own name and
as trustee of an express trust against the Company for the whole amount of
principal of, premium and Liquidated Damages, if any, and interest remaining
unpaid on the Notes and interest on overdue principal and, to the extent lawful,
interest and such further amount as shall be sufficient to cover the costs and
expenses of collection, including the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel.

Section 6.09.  Trustee May File Proofs of Claim.

          The Trustee is authorized to file such proofs of claim and other
papers or documents as may be necessary or advisable in order to have the claims
of the Trustee (including any claim for the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel) and the
Holders of the Notes allowed in any judicial proceedings relative to the Company
(or any other obligor upon the Notes), its creditors or its property and shall
be entitled and empowered to collect, receive and distribute any money or other
property payable or deliverable on any such claims and any custodian in any such
judicial proceeding is hereby authorized by each Holder to make such payments

                                      54
<PAGE>
 
to the Trustee, and in the event that the Trustee shall consent to the making of
such payments directly to the Holders, to pay to the Trustee any amount due to
it for the reasonable compensation, expenses, disbursements and advances of the
Trustee, its agents and counsel, and any other amounts due the Trustee under
Section 7.07 hereof. To the extent that the payment of any such compensation,
expenses, disbursements and advances of the Trustee, its agents and counsel, and
any other amounts due the Trustee under Section 7.07 hereof out of the estate in
any such proceeding, shall be denied for any reason, payment of the same shall
be secured by a Lien on, and shall be paid out of, any and all distributions,
dividends, money, securities and other properties that the Holders may be
entitled to receive in such proceeding whether in liquidation or under any plan
of reorganization or arrangement or otherwise. Nothing herein contained shall be
deemed to authorize the Trustee to authorize or consent to or accept or adopt on
behalf of any Holder any plan of reorganization, arrangement, adjustment or
composition affecting the Notes or the rights of any Holder, or to authorize the
Trustee to vote in respect of the claim of any Holder in any such proceeding.

Section 6.10.  Priorities.

          If the Trustee collects any money pursuant to this Article, it shall
pay out the money in the following order:

          First:  to the Trustee, its agents and attorneys for amounts due under
Section 7.07 hereof, including payment of all compensation, expense and
liabilities incurred, and all advances made, by the Trustee and the costs and
expenses of collection;

          Second:  to Holders of Notes for amounts due and unpaid on the Notes
for principal, premium and Liquidated Damages, if any, and interest, ratably,
without preference or priority of any kind, according to the amounts due and
payable on the Notes for principal, premium and Liquidated Damages, if any and
interest, respectively; and

          Third:  to the Company or to such party as a court of competent
jurisdiction shall direct.

          The Trustee may fix a record date and payment date for any payment to
Holders of Notes pursuant to this Section 6.10.

Section 6.11.  Undertaking for Costs.

          In any suit for the enforcement of any right or remedy under this
Indenture or in any suit against the Trustee for any action taken or omitted by
it as a Trustee, a court in its discretion may require the filing by any party
litigant in the suit of an undertaking to pay the costs of the suit, and the
court in its discretion may assess reasonable costs, including reasonable
attorneys' fees, against any party litigant in the suit, having due regard to
the merits and good faith of the claims or defenses made by the party litigant.
This Section does not apply to a suit by the Trustee, a suit by a Holder of a
Note pursuant to Section 6.07 hereof, or a suit by Holders of more than 10% in
principal amount at maturity of the then outstanding Notes.

                                      55
<PAGE>
 
                                   ARTICLE 7.
                                    TRUSTEE

Section 7.01.  Duties of Trustee.

          (a)  If an Event of Default has occurred and is continuing, the
Trustee shall exercise such of the rights and powers vested in it by this
Indenture, and use the same degree of care and skill in its exercise, as a
prudent man would exercise or use under the circumstances in the conduct of his
own affairs.

          (b)  Except during the continuance of an Event of Default:

     (i)    the duties of the Trustee shall be determined solely by the express
  provisions of this Indenture and the Trustee need perform only those duties
  that are specifically set forth in this Indenture and no others, and no
  implied covenants or obligations shall be read into this Indenture against the
  Trustee; and

     (ii)   in the absence of bad faith on its part, the Trustee may
  conclusively rely, as to the truth of the statements and the correctness of
  the opinions expressed therein, upon certificates or opinions furnished to the
  Trustee and conforming to the requirements of this Indenture. However, the
  Trustee shall examine the certificates and opinions to determine whether or
  not they conform to the requirements of this Indenture.

          (c)  The Trustee may not be relieved from liabilities for its own
negligent action, its own negligent failure to act, or its own willful
misconduct, except that:

     (i)    this paragraph does not limit the effect of paragraph (b) of this
  Section;

     (ii)   the Trustee shall not be liable for any error of judgment made in
  good faith by a Responsible Officer, unless it is proved that the Trustee was
  negligent in ascertaining the pertinent facts; and

     (iii)  the Trustee shall not be liable with respect to any action it takes
  or omits to take in good faith in accordance with a direction received by it
  pursuant to Section 6.05 hereof.

          (d)  Whether or not therein expressly so provided, every provision of
this Indenture that in any way relates to the Trustee is subject to paragraphs
(a), (b), and (c) of this Section.

          (e)  No provision of this Indenture shall require the Trustee to
expend or risk its own funds or incur any liability. The Trustee shall be under
no obligation to exercise any of its rights and powers under this Indenture at
the request of any Holders, unless such Holder shall have offered to the Trustee
security and indemnity satisfactory to it against any loss, liability or
expense.

          (f)  The Trustee shall not be liable for interest on any money
received by it except as the Trustee may agree in writing with the Company.
Money held in trust by the Trustee need not be segregated from other funds
except to the extent required by law.

                                      56
<PAGE>
 
Section 7.02.  Rights of Trustee.

     (a) The Trustee may conclusively rely upon any document believed by it to
be genuine and to have been signed or presented by the proper Person.  The
Trustee need not investigate any fact or matter stated in the document.

     (b) Before the Trustee acts or refrains from acting, it may require an
Officers' Certificate or an Opinion of Counsel or both.  The Trustee shall not
be liable for any action it takes or omits to take in good faith in reliance on
such Officers' Certificate or Opinion of Counsel.  The Trustee may consult with
counsel and the written advice of such counsel or any Opinion of Counsel shall
be full and complete authorization and protection from liability in respect of
any action taken, suffered or omitted by it hereunder in good faith and in
reliance thereon.

     (c) The Trustee may act through its attorneys and agents and shall not be
responsible for the misconduct or negligence of any agent appointed with due
care.

     (d) The Trustee shall not be liable for any action it takes or omits to
take in good faith that it believes to be authorized or within the rights or
powers conferred upon it by this Indenture.

     (e) Unless otherwise specifically provided in this Indenture, any demand,
request, direction or notice from the Company shall be sufficient if signed by
an Officer of the Company.

     (f) The Trustee shall be under no obligation to exercise any of the rights
or powers vested in it by this Indenture at the request or direction of any of
the Holders unless such Holders shall have offered to the Trustee reasonable
security or indemnity against the costs, expenses and liabilities that might be
incurred by it in compliance with such request or direction.

Section 7.03.  Individual Rights of Trustee.

     The Trustee in its individual or any other capacity may become the owner or
pledgee of Notes and may otherwise deal with the Company or any Affiliate of the
Company with the same rights it would have if it were not Trustee.  However, in
the event that the Trustee acquires any conflicting interest it must eliminate
such conflict within 90 days, apply to the SEC for permission to continue as
trustee or resign.  Any Agent may do the same with like rights and duties.  The
Trustee is also subject to Sections 7.10 and 7.11 hereof.

Section 7.04.  Trustee's Disclaimer.

     The Trustee shall not be responsible for and makes no representation as to
the validity or adequacy of this Indenture or the Notes, it shall not be
accountable for the Company's use of the proceeds from the Notes or any money
paid to the Company or upon the Company's direction under any provision of this
Indenture, it shall not be responsible for the use or application of any money
received by any Paying Agent other than the Trustee, and it shall not be
responsible for any statement or recital herein or any statement in the Notes or
any other document in connection with the sale of the Notes or pursuant to this
Indenture other than its certificate of authentication.

                                      57
<PAGE>
 
Section 7.05.  Notice of Defaults.

     If a Default or Event of Default occurs and is continuing and if it is
known to the Trustee, the Trustee shall mail to Holders of Notes a notice of the
Default or Event of Default within 90 days after it occurs.  Except in the case
of a Default or Event of Default in payment of principal of, premium, if any, or
interest on any Note, the Trustee may withhold the notice if and so long as a
committee of its Responsible Officers in good faith determines that withholding
the notice is in the interests of the Holders of the Notes.

Section 7.06.  Reports by Trustee to Holders of the Notes.

     Within 60 days after each May 15 beginning with the May 15 following the
date of this Indenture, and for so long as Notes remain outstanding, the Trustee
shall mail to the Holders of the Notes a brief report dated as of such reporting
date that complies with TIA (S) 313(a) (but if no event described in TIA (S)
313(a) has occurred within the twelve months preceding the reporting date, no
report need be transmitted).  The Trustee also shall comply with TIA (S)
313(b)(2).  The Trustee shall also transmit by mail all reports as required by
TIA (S) 313(c).

     A copy of each report at the time of its mailing to the Holders of Notes
shall be mailed to the Company and filed with the SEC and each stock exchange on
which the Notes are listed in accordance with TIA (S) 313(d).  The Company shall
promptly notify the Trustee when the Notes are listed on any stock exchange.

Section 7.07.  Compensation and Indemnity.

     The Company shall pay to the Trustee from time to time reasonable
compensation for its acceptance of this Indenture and services hereunder.  The
Trustee's compensation shall not be limited by any law on compensation of a
trustee of an express trust.  The Company shall reimburse the Trustee promptly
upon request for all reasonable disbursements, advances and expenses incurred or
made by it in addition to the compensation for its services.  Such expenses
shall include the reasonable compensation, disbursements and expenses of the
Trustee's agents and counsel.

     The Company shall indemnify the Trustee against any and all losses,
liabilities or expenses incurred by it arising out of or in connection with the
acceptance or administration of its duties under this Indenture, including the
costs and expenses of enforcing this Indenture against the Company (including
this Section 7.07) and defending itself against any claim (whether asserted by
the Company or any Holder or any other person) or liability in connection with
the exercise or performance of any of its powers or duties hereunder, except to
the extent any such loss, liability or expense may be attributable to its
negligence or bad faith.  The Trustee shall notify the Company promptly of any
claim for which it may seek indemnity.  Failure by the Trustee to so notify the
Company shall not relieve the Company of its obligations hereunder.  The Company
shall defend the claim and the Trustee shall cooperate in the defense.  The
Trustee may have separate counsel and the Company shall pay the reasonable fees
and expenses of such counsel.  The Company need not pay for any settlement made
without its consent, which consent shall not be unreasonably withheld.

     The obligations of the Company under this Section 7.07 shall survive the
satisfaction and discharge of this Indenture.

                                      58
<PAGE>
 
     To secure the Company's payment obligations in this Section, the Trustee
shall have a Lien prior to the Notes on all money or property held or collected
by the Trustee, except that held in trust to pay principal and interest on
particular Notes.  Such Lien shall survive the satisfaction and discharge of
this Indenture.

     When the Trustee incurs expenses or renders services after an Event of
Default specified in Section 6.01(g) or (h) hereof occurs, the expenses and the
compensation for the services (including the fees and expenses of its agents and
counsel) are intended to constitute expenses of administration under any
Bankruptcy Law.

     The Trustee shall comply with the provisions of TIA (S) 313(b)(2) to the
extent applicable.

Section 7.08.  Replacement of Trustee.

     A resignation or removal of the Trustee and appointment of a successor
Trustee shall become effective only upon the successor Trustee's acceptance of
appointment as provided in this Section.

     The Trustee may resign in writing at any time and be discharged from the
trust hereby created by so notifying the Company.  The Holders of Notes of a
majority in principal amount at maturity of the then outstanding Notes may
remove the Trustee by so notifying the Trustee and the Company in writing.  The
Company may remove the Trustee if:

     (a) the Trustee fails to comply with Section 7.10 hereof;

     (b) the Trustee is adjudged a bankrupt or an insolvent or an order for
relief is entered with respect to the Trustee under any Bankruptcy Law;

     (c) a Custodian or public officer takes charge of the Trustee or its
property; or

     (d) the Trustee becomes incapable of acting.

     If the Trustee resigns or is removed or if a vacancy exists in the office
of Trustee for any reason, the Company shall promptly appoint a successor
Trustee.  Within one year after the successor Trustee takes office, the Holders
of a majority in principal amount at maturity of the then outstanding Notes may
appoint a successor Trustee to replace the successor Trustee appointed by the
Company.

     If a successor Trustee does not take office within 60 days after the
retiring Trustee resigns or is removed, the retiring Trustee, the Company, or
the Holders of Notes of at least 10% in principal amount at maturity of the then
outstanding Notes may petition any court of competent jurisdiction for the
appointment of a successor Trustee.

     If the Trustee, after written request by any Holder of a Note who has been
a Holder of a Note for at least six months, fails to comply with Section 7.10,
such Holder of a Note may petition any court of competent jurisdiction for the
removal of the Trustee and the appointment of a successor Trustee.

                                      59
<PAGE>
 
     A successor Trustee shall deliver a written acceptance of its appointment
to the retiring Trustee and to the Company.  Thereupon, the resignation or
removal of the retiring Trustee shall become effective, and the successor
Trustee shall have all the rights, powers and duties of the Trustee under this
Indenture.  The successor Trustee shall mail a notice of its succession to
Holders of the Notes.  The retiring Trustee shall promptly transfer all property
held by it as Trustee to the successor Trustee, provided all sums owing to the
Trustee hereunder have been paid and subject to the Lien provided for in Section
7.07 hereof.  Notwithstanding replacement of the Trustee pursuant to this
Section 7.08, the Company's obligations under Section 7.07 hereof shall continue
for the benefit of the retiring Trustee.

Section 7.09.  Successor Trustee by Merger, etc.

     If the Trustee consolidates, merges or converts into, or transfers all or
substantially all of its corporate trust business to, another corporation, the
successor corporation without any further act shall be the successor Trustee.

Section 7.10.  Eligibility; Disqualification.

     There shall at all times be a Trustee hereunder that is a corporation
organized and doing business under the laws of the United States of America or
of any state thereof that is authorized under such laws to exercise corporate
trustee power, that is subject to supervision or examination by federal or state
authorities and that has a combined capital and surplus of at least $50 million
as set forth in its most recent published annual report of condition.

     This Indenture shall always have a Trustee who satisfies the requirements
of TIA (S) 310(a)(1), (2) and (5).  The Trustee is subject to TIA (S) 310(b).

Section 7.11.  Preferential Collection of Claims Against Company.

     The Trustee is subject to TIA (S) 311(a), excluding any creditor
relationship listed in TIA (S) 311(b).  A Trustee who has resigned or been
removed shall be subject to TIA (S) 311(a) to the extent indicated therein.

                                      60
<PAGE>
 
                                  ARTICLE 8.
                   LEGAL DEFEASANCE AND COVENANT DEFEASANCE

Section 8.01.  Option to Effect Legal Defeasance or Covenant Defeasance.

     When (i) the Company delivers to the Trustee all outstanding Notes (other
than Notes replaced pursuant to Section 2.07) for cancellation or (ii) all
outstanding Notes have become due and payable, whether at maturity or as a
result of the mailing of a notice of redemption pursuant to Article 3 hereof and
the Company irrevocably deposits with the Trustee funds sufficient to pay at
maturity or upon redemption all outstanding Notes, including interest thereon to
maturity or such redemption date (other than Notes replaced pursuant to Section
2.07), and if in either case the Company pays all other sums payable hereunder
by the Company, then this Indenture shall, subject to the proviso set forth in
Section 8.02, cease to be of further effect.  The Company may, at the option of
its Board of Directors evidenced by a resolution set forth in an Officers'
Certificate, at any time, elect to have either Section 8.02 or 8.03 hereof
applied to all outstanding Notes upon compliance with the conditions set forth
below in this Article Eight.

Section 8.02.  Legal Defeasance and Discharge.

     Upon the Company's exercise under Section 8.01 hereof of the option
applicable to this Section 8.02, the Company shall, subject to the satisfaction
of the conditions set forth in Section 8.04 hereof, be deemed to have been
discharged from its obligations with respect to all outstanding Notes on the
date the conditions set forth below are satisfied (hereinafter, "Legal
Defeasance").  For this purpose, Legal Defeasance means that the Company shall
be deemed to have paid and discharged the entire Indebtedness represented by the
outstanding Notes, which shall thereafter be deemed to be "outstanding" only for
the purposes of Section 8.05 hereof and the other Sections of this Indenture
referred to in (a) and (b) below, and to have satisfied all its other
obligations under such Notes and this Indenture (and the Trustee, on demand of
and at the expense of the Company, shall execute proper instruments
acknowledging the same); provided that the following provisions which shall
survive until otherwise terminated or discharged hereunder:  (a) the rights of
Holders of outstanding Notes to receive solely from the trust fund described in
Section 8.04 hereof, and as more fully set forth in such Section, payments in
respect of the principal of, premium, if any, and interest and Liquidated
Damages on such Notes when such payments are due, (b) the Company's obligations
with respect to such Notes under Article 2 and Section 4.02 hereof, (c) the
rights, powers, trusts, duties and immunities of the Trustee hereunder and the
Company's obligations in connection therewith and (d) this Article Eight.
Subject to compliance with this Article Eight, the Company may exercise its
option under this Section 8.02 notwithstanding the prior exercise of its option
under Section 8.03 hereof.

Section 8.03.  Covenant Defeasance.

     Upon the Company's exercise under Section 8.01 hereof of the option
applicable to this Section 8.03, the Company shall, subject to the satisfaction
of the conditions set forth in Section 8.04 hereof, be released from its
obligations under the covenants contained in Sections 4.07, 4.08, 4.09, 4.10,
4.11, 4.12, 4.13, 4.15, 4.16, 4.17 and 4.18 hereof with respect to the
outstanding Notes on and after the date the conditions set forth in Section 8.04
are satisfied (hereinafter, "Covenant Defeasance"), and the Notes shall
thereafter be deemed not "outstanding" for the purposes of any direction,
waiver, consent or declaration or act of Holders (and the consequences of any
thereof) in connection with such covenants, but shall continue to be deemed
"outstanding" for all other purposes hereunder (it being understood that such
Notes shall not be deemed outstanding for accounting 

                                      61
<PAGE>
 
purposes). For this purpose, Covenant Defeasance means that, with respect to the
outstanding Notes, the Company may omit to comply with and shall have no
liability in respect of any term, condition or limitation set forth in any such
covenant, whether directly or indirectly, by reason of any reference elsewhere
herein to any such covenant or by reason of any reference in any such covenant
to any other provision herein or in any other document and such omission to
comply shall not constitute a Default or an Event of Default under Section 6.01
hereof, but, except as specified above, the remainder of this Indenture and such
Notes shall be unaffected thereby. In addition, upon the Company's exercise
under Section 8.01 hereof of the option applicable to this Section 8.03 hereof,
subject to the satisfaction of the conditions set forth in Section 8.04 hereof,
Sections 6.01(d) through 6.01(f) hereof shall not constitute Events of Default.

Section 8.04.  Conditions to Legal or Covenant Defeasance.

     The following shall be the conditions to the application of either Section
8.02 or 8.03 hereof to the outstanding Notes:

In order to exercise either Legal Defeasance or Covenant Defeasance:

     (a) the Company must irrevocably deposit with the Trustee, in trust, for
the benefit of the Holders, cash in United States dollars, non-callable
Government Securities, or a combination thereof, in such amounts as will be
sufficient, in the opinion of a nationally recognized firm of independent public
accountants, to pay the principal of, premium, if any, and interest and
Liquidated Damages on the outstanding Notes on the stated maturity or on the
applicable redemption date, as the case may be, and the Company must specify
whether the Notes are being defeased to maturity or to a particular redemption
date;

     (b) in the case of an election under Section 8.02 hereof, the Company shall
have delivered to the Trustee an Opinion of Counsel in the United States
reasonably acceptable to the Trustee confirming that (A) the Company has
received from, or there has been published by, the Internal Revenue Service a
ruling or (B) since the date of this Indenture, there has been a change in the
applicable federal income tax law, in either case to the effect that, and based
thereon such Opinion of Counsel shall confirm that, the Holders of the
outstanding Notes will not recognize income, gain or loss for federal income tax
purposes as a result of such Legal Defeasance and will be subject to federal
income tax on the same amounts, in the same manner and at the same times as
would have been the case if such Legal Defeasance had not occurred;

     (c) in the case of an election under Section 8.03 hereof, the Company shall
have delivered to the Trustee an Opinion of Counsel in the United States
reasonably acceptable to the Trustee confirming that the Holders of the
outstanding Notes will not recognize income, gain or loss for federal income tax
purposes as a result of such Covenant Defeasance and will be subject to federal
income tax on the same amounts, in the same manner and at the same times as
would have been the case if such Covenant Defeasance had not occurred;

     (d) no Default or Event of Default shall have occurred and be continuing on
the date of such deposit (other than a Default or Event of Default resulting
from the incurrence of Indebtedness all or a portion of the proceeds of which
will be used to defease the Notes pursuant to this Article Eight concurrently
with such incurrence) or insofar as Sections 6.01(g) or 6.01(h) hereof is
concerned, at any time in the period ending on the 91st day after the date of
deposit;

                                      62
<PAGE>
 
     (e) such Legal Defeasance or Covenant Defeasance shall not result in a
breach or violation of, or constitute a default under, any material agreement or
instrument (other than this Indenture) to which the Company or any of its
Restricted Subsidiaries is a party or by which the Company or any of its
Restricted Subsidiaries is bound;

     (f) the Company shall have delivered to the Trustee an Opinion of Counsel
(which may be subject to customary exceptions) to the effect that on the 91/st/
day following the deposit, the trust funds will not be subject to the effect of
any applicable bankruptcy, insolvency, reorganization or similar laws affecting
creditors' rights generally;

     (g) the Company shall have delivered to the Trustee an Officers'
Certificate stating that the deposit was not made by the Company with the intent
of preferring the Holders over any other creditors of the Company or with the
intent of defeating, hindering, delaying or defrauding any other creditors of
the Company; and

     (h) the Company shall have delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that all conditions
precedent provided for or relating to the Legal Defeasance or the Covenant
Defeasance have been complied with.

Section 8.05.  Deposited Money and Government Securities to be Held in Trust;
Other Miscellaneous Provisions.

     Subject to Section 8.06 hereof, all money and non-callable Government
Securities (including the proceeds thereof) deposited with the Trustee (or other
qualifying trustee, collectively for purposes of this Section 8.05, the
"Trustee") pursuant to Section 8.04 hereof in respect of the outstanding Notes
shall be held in trust and applied by the Trustee, in accordance with the
provisions of such Notes and this Indenture, to the payment, either directly or
through any Paying Agent (including the Company acting as Paying Agent) as the
Trustee may determine, to the Holders of such Notes of all sums due and to
become due thereon in respect of principal, premium, if any, interest and
Liquidated Damages, if any, but such money need not be segregated from other
funds except to the extent required by law.

     The Company shall pay and indemnify the Trustee against any tax, fee or
other charge imposed on or assessed against the cash or non-callable Government
Securities deposited pursuant to Section 8.04 hereof or the principal and
interest received in respect thereof other than any such tax, fee or other
charge which by law is for the account of the Holders of the outstanding Notes.

     Anything in this Article Eight to the contrary notwithstanding, the Trustee
shall deliver or pay to the Company from time to time upon the request of the
Company any money or non-callable Government Securities held by it as provided
in Section 8.04 hereof which, in the opinion of a nationally recognized firm of
independent public accountants expressed in a written certification thereof
delivered to the Trustee (which may be the opinion delivered under Section
8.04(a) hereof), are in excess of the amount thereof that would then be required
to be deposited to effect an equivalent Legal Defeasance or Covenant Defeasance.

                                      63
<PAGE>
 
Section 8.06.  Repayment to Company.

     Any money deposited with the Trustee or any Paying Agent, or then held by
the Company, in trust for the payment of the principal of, premium, if any, or
interest on any Note and remaining unclaimed for two years after such principal,
and premium, if any, or interest has become due and payable shall be paid to the
Company on its request or (if then held by the Company) shall be discharged from
such trust; and the Holder of such Note shall thereafter, as a secured creditor,
look only to the Company for payment thereof, and all liability of the Trustee
or such Paying Agent with respect to such trust money, and all liability of the
Company as trustee thereof, shall thereupon cease; provided, however, that the
Trustee or such Paying Agent, before being required to make any such repayment,
may at the expense of the Company cause to be published once, in the New York
Times and The Wall Street Journal (national edition), notice that such money
remains unclaimed and that, after a date specified therein, which shall not be
less than 30 days from the date of such notification or publication, any
unclaimed balance of such money then remaining will be repaid to the Company.

Section 8.07.  Reinstatement.

     If the Trustee or Paying Agent is unable to apply any United States dollars
or non-callable Government Securities in accordance with Section 8.02 or 8.03
hereof, as the case may be, by reason of any order or judgment of any court or
governmental authority enjoining, restraining or otherwise prohibiting such
application, then the Company's obligations under this Indenture and the Notes
shall be revived and reinstated as though no deposit had occurred pursuant to
Section 8.02 or 8.03 hereof until such time as the Trustee or Paying Agent is
permitted to apply all such money in accordance with Section 8.02 or 8.03
hereof, as the case may be; provided, however, that, if the Company makes any
payment of principal of, premium, if any, or interest on any Note following the
reinstatement of its obligations, the Company shall be subrogated to the rights
of the Holders of such Notes to receive such payment from the money held by the
Trustee or Paying Agent.

                                  ARTICLE 9.
                       AMENDMENT, SUPPLEMENT AND WAIVER

Section 9.01.  Without Consent of Holders of Notes.

     Notwithstanding Section 9.02 of this Indenture, the Company and the Trustee
may amend or supplement this Indenture or the Notes without the consent of any
Holder of a Note:

     (a) to cure any ambiguity, defect or inconsistency;

     (b) to provide for uncertificated Notes in addition to or in place of
certificated Notes or to alter the provisions of Article 2 hereof (including the
related definitions) in a manner that does not materially adversely affect any
Holder;

     (c) to provide for the assumption of the Company's obligations to the
Holders of the Notes by a successor to the Company pursuant to Article 5 hereof;

     (d) to make any change that would provide any additional rights or benefits
to the Holders of the Notes or that does not adversely affect the legal rights
hereunder of any Holder of the Note;

                                      64
<PAGE>
 
     (e) to comply with requirements of the SEC in order to effect or maintain
the qualification of this Indenture under the TIA;

     Upon the request of the Company accompanied by a resolution of its Board of
Directors authorizing the execution of any such amended or supplemental
Indenture, and upon receipt by the Trustee of the documents described in Section
7.02 hereof, the Trustee shall join with the Company in the execution of any
amended or supplemental Indenture authorized or permitted by the terms of this
Indenture and to make any further appropriate agreements and stipulations that
may be therein contained, but the Trustee shall not be obligated to enter into
such amended or supplemental Indenture that affects its own rights, duties or
immunities under this Indenture or otherwise.

Section 9.02.  With Consent of Holders of Notes.

     Except as provided below in this Section 9.02, the Company and the Trustee
may amend or supplement this Indenture (including Section 3.09, 4.10 and 4.15
hereto) and the Notes may be amended or supplemented with the consent of the
Holders of at least a majority in principal amount at maturity of the Notes then
outstanding voting as a single class (including consents obtained in connection
with a tender offer or exchange offer for, or purchase of, the Notes), and,
subject to Sections 6.04 and 6.07 hereof, any existing Default or Event of
Default (other than a Default or Event of Default in the payment of the
principal of, premium, if any, or interest on the Notes, except a payment
default resulting from an acceleration that has been rescinded) or compliance
with any provision of this Indenture or the Notes may be waived with the consent
of the Holders of a majority in principal amount at maturity of the then
outstanding Notes voting as a single class (including consents obtained in
connection with a tender offer or exchange offer for, or purchase of, the
Notes).  Section 2.08 hereof shall determine which Notes are considered to be
"outstanding" for purposes of this Section 9.02.

     Upon the request of the Company accompanied by a resolution of its Board of
Directors authorizing the execution of any such amended or supplemental
Indenture, and upon the filing with the Trustee of evidence satisfactory to the
Trustee of the consent of the Holders of Notes as aforesaid, and upon receipt by
the Trustee of the documents described in Section 7.02 hereof, the Trustee shall
join with the Company in the execution of such amended or supplemental Indenture
unless such amended or supplemental Indenture directly affects the Trustee's own
rights, duties or immunities under this Indenture or otherwise, in which case
the Trustee may in its discretion, but shall not be obligated to, enter into
such amended or supplemental Indenture.

     It shall not be necessary for the consent of the Holders of Notes under
this Section 9.02 to approve the particular form of any proposed amendment or
waiver, but it shall be sufficient if such consent approves the substance
thereof.

     After an amendment, supplement or waiver under this Section becomes
effective, the Company shall mail to the Holders of Notes affected thereby a
notice briefly describing the amendment, supplement or waiver.  Any failure of
the Company to mail such notice, or any defect therein, shall not, however, in
any way impair or affect the validity of any such amended or supplemental
Indenture or waiver.  Subject to Sections 6.04 and 6.07 hereof, the Holders of a
majority in aggregate principal amount at maturity of the Notes then outstanding
voting as a single class may waive compliance in a particular instance by the
Company with any provision of this Indenture or the 

                                      65
<PAGE>
 
Notes. However, without the consent of each Holder affected, an amendment or
waiver under this Section 9.02 may not (with respect to any Notes held by a non-
consenting Holder):

     (a) reduce the principal amount at maturity of Notes whose Holders must
consent to an amendment, supplement or waiver;

     (b) reduce the principal of or change the fixed maturity of any Note or
alter or waive any of the provisions with respect to the redemption of the Notes
except as provided above with respect to Sections 3.09, 4.10 and 4.15 hereof;

     (c) reduce the rate of or change the time for payment of interest,
including default interest, on any Note;

     (d) waive a Default or Event of Default in the payment of principal of or
premium, if any, or interest on the Notes (except a rescission of acceleration
of the Notes by the Holders of at least a majority in aggregate principal amount
at maturity of the then outstanding Notes and a waiver of the payment default
that resulted from such acceleration);

     (e) make any Note payable in money other than that stated in the Notes;

     (f) make any change in the provisions of this Indenture relating to waivers
of past Defaults or the rights of Holders of Notes to receive payments of
principal of, premium, if any, or interest on the Notes; or

     (g) make any change in Section 6.04 or 6.07 hereof or in the foregoing
amendment and waiver provisions.

Section 9.03.  Compliance with Trust Indenture Act.

     Every amendment or supplement to this Indenture or the Notes shall be set
forth in a amended or supplemental Indenture that complies with the TIA as then
in effect.

Section 9.04.  Revocation and Effect of Consents.

     Until an amendment, supplement or waiver becomes effective, a consent to it
by a Holder of a Note is a continuing consent by the Holder of a Note and every
subsequent Holder of a Note or portion of a Note that evidences the same debt as
the consenting Holder's Note, even if notation of the consent is not made on any
Note.  However, any such Holder of a Note or subsequent Holder of a Note may
revoke the consent as to its Note if the Trustee receives written notice of
revocation before the date the waiver, supplement or amendment becomes
effective.  An amendment, supplement or waiver becomes effective in accordance
with its terms and thereafter binds every Holder.

Section 9.05.  Notation on or Exchange of Notes.

     The Trustee may place an appropriate notation about an amendment,
supplement or waiver on any Note thereafter authenticated.  The Company in
exchange for all Notes may issue and the Trustee shall, upon receipt of an
Authentication Order, authenticate new Notes that reflect the amendment,
supplement or waiver.

                                      66
<PAGE>
 
     Failure to make the appropriate notation or issue a new Note shall not
affect the validity and effect of such amendment, supplement or waiver.

Section 9.06.  Trustee to Sign Amendments, etc.

     The Trustee shall sign any amended or supplemental Indenture authorized
pursuant to this Article Nine if the amendment or supplement does not adversely
affect the rights, duties, liabilities or immunities of the Trustee.  The
Company may not sign an amendment or supplemental Indenture until the Board of
Directors approves it.  In executing any amended or supplemental indenture, the
Trustee shall be entitled to receive and (subject to Section 7.01 hereof) shall
be fully protected in relying upon, in addition to the documents required by
Section 10.04 hereof, an Officer's Certificate and an Opinion of Counsel stating
that the execution of such amended or supplemental indenture is authorized or
permitted by this Indenture.

                                  ARTICLE 10.
                                 MISCELLANEOUS

Section 10.01.  Trust Indenture Act Controls.

     If any provision of this Indenture limits, qualifies or conflicts with the
duties imposed by TIA (S) 318(c), the imposed duties shall control.

Section 10.02.  Notices.

     Any notice or communication by the Company or the Trustee to the others is
duly given if in writing and delivered in Person or mailed by first class mail
(registered or certified, return receipt requested), telex, telecopier or
overnight air courier guaranteeing next day delivery, to the others' address

     If to the Company:

     Crown Castle International Corp.
     150 Bering Drive, Suite 500
     Houston, TX  77057
     Telecopier No.:  713-974-1926
     Attention:  Chief Financial Officer
     
     With a copy to:
     
     Cravath, Swaine & Moore
     Worldwide Plaza
     825 Eighth Avenue
     New York, NY  10019
     Telecopier No.:  212-474-0997
     Attention:  Kris F. Heinzelman
     
     If to the Trustee:

                                      67
<PAGE>
 
     United States Trust Company of New York
     114 West 47th Street, 25th Floor
     New York, NY  10036
     Telecopier No.:  212-528-1626
     Attention:  Gerard F. Ganey
 
     The Company or the Trustee, by notice to the others may designate
additional or different addresses for subsequent notices or communications.

     All notices and communications (other than those sent to Holders) shall be
deemed to have been duly given: at the time delivered by hand, if personally
delivered; five Business Days after being deposited in the mail, postage
prepaid, if mailed; when answered back, if telexed; when receipt acknowledged,
if telecopied; and the next Business Day after timely delivery to the courier,
if sent by overnight air courier guaranteeing next day delivery.

     Any notice or communication to a Holder shall be mailed by first class
mail, certified or registered, return receipt requested, or by overnight air
courier guaranteeing next day delivery to its address shown on the register kept
by the Registrar. Any notice or communication shall also be so mailed to any
Person described in TIA (S) 313(c), to the extent required by the TIA. Failure
to mail a notice or communication to a Holder or any defect in it shall not
affect its sufficiency with respect to other Holders.

     If a notice or communication is mailed in the manner provided above within
the time prescribed, it is duly given, whether or not the addressee receives it.

     If the Company mails a notice or communication to Holders, it shall mail a
copy to the Trustee and each Agent at the same time.

Section 10.03.  Communication by Holders of Notes with Other Holders of Notes.

     Holders may communicate pursuant to TIA (S) 312(b) with other Holders with
respect to their rights under this Indenture or the Notes. The Company, the
Trustee, the Registrar and anyone else shall have the protection of TIA (S)
312(c).

Section 10.04.  Certificate and Opinion as to Conditions Precedent.

     Upon any request or application by the Company to the Trustee to take any
action under this Indenture, the Company shall furnish to the Trustee:

     (a) an Officers' Certificate in form and substance reasonably satisfactory
to the Trustee (which shall include the statements set forth in Section 11.05
hereof) stating that, in the opinion of the signers, all conditions precedent
and covenants, if any, provided for in this Indenture relating to the proposed
action have been satisfied; and

     (b) an Opinion of Counsel in form and substance reasonably satisfactory to
the Trustee (which shall include the statements set forth in Section 11.05
hereof) stating that, in the opinion of such counsel, all such conditions
precedent and covenants have been satisfied.

                                      68
<PAGE>
 
Section 10.05.  Statements Required in Certificate or Opinion.

     Each certificate or opinion with respect to compliance with a condition or
covenant provided for in this Indenture (other than a certificate provided
pursuant to TIA (S) 314(a)(4)) shall comply with the provisions of TIA (S)
314(e) and shall include:

     (a) a statement that the Persons making such certificate or opinion has
read such covenant or condition;

     (b) a brief statement as to the nature and scope of the examination or
investigation upon which the statements or opinions contained in such
certificate or opinion are based;

     (c) a statement that, in the opinion of such Person, he, she has or they
have made such examination or investigation as is necessary to enable him to
express an informed opinion as to whether or not such covenant or condition has
been satisfied; and

     (d) a statement as to whether or not, in the opinion of such Persons, such
condition or covenant has been satisfied.

Section 10.06.  Rules by Trustee and Agents.

     The Trustee may make reasonable rules for action by or at a meeting of
Holders.  The Registrar or Paying Agent may make reasonable rules and set
reasonable requirements for its functions.

Section 10.07.  No Personal Liability of Directors, Officers, Employees and
Stockholders.

     No past, present or future director, officer, employee, incorporator or
stockholder of the Company, as such, shall have any liability for any
obligations of the Company under the Notes, this Indenture or for any claim
based on, in respect of, or by reason of, such obligations or their creation.
Each Holder by accepting a Note waives and releases all such liability. The
waiver and release are part of the consideration for issuance of the Notes.

Section 10.08.  Governing Law.

     THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO
CONSTRUE THIS INDENTURE, THE NOTES WITHOUT GIVING EFFECT TO APPLICABLE
PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF
ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

Section 10.09.  No Adverse Interpretation of Other Agreements.

     This Indenture may not be used to interpret any other indenture, loan or
debt agreement of the Company or its Subsidiaries or of any other Person. Any
such indenture, loan or debt agreement may not be used to interpret this
Indenture.

                                      69
<PAGE>
 
Section 10.10.  Successors.

     All agreements of the Company in this Indenture and the Notes shall bind
its successors. All agreements of the Trustee in this Indenture shall bind its
successors.

Section 10.11.  Severability.

     In case any provision in this Indenture or in the Notes shall be invalid,
illegal or unenforceable, the validity, legality and enforceability of the
remaining provisions shall not in any way be affected or impaired thereby.

Section 10.12.  Counterpart Originals.

     The parties may sign any number of copies of this Indenture. Each signed
copy shall be an original, but all of them together represent the same
agreement.

Section 10.13.  Table of Contents, Headings, etc.

     The Table of Contents, Cross-Reference Table and Headings of the Articles
and Sections of this Indenture have been inserted for convenience of reference
only, are not to be considered a part of this Indenture and shall in no way
modify or restrict any of the terms or provisions hereof.

                        [Signatures on following page]

                                      70
<PAGE>
 
                                  SIGNATURES

                                    Dated as of November 25, 1997

                                    CROWN CASTLE INTERNATIONAL CORP.


                                    By: /s/ JOHN L. GWYN
                                        -------------------------
                                        Name: John L. Gwyn
                                        Title: Executive Vice President

Attest:

/s/ KATHY GLASS BROUSSARD
- -------------------------
Name: Kathy Glass Broussard
Title: Corporate Secretary



                                    UNITED STATES TRUST COMPANY OF NEW YORK

                                    By: /s/ GERARD F. GANEY
                                        -------------------------
                                        Name: Gerard F. Ganey
                                        Title: Senior Vice President


Attest:

/s/ SIRQNI L. DINDIAL
- -------------------------
Name: Sirqni L. Dindial
Title: Assistant Secretary

                                      71
<PAGE>
 
                                  EXHIBIT A-1
                                 (Face of Note)

================================================================================

     FOR THE PURPOSES OF SECTIONS 1272, 1273 AND 1275 OF THE INTERNAL REVENUE
     CODE OF 1986, AS AMENDED, THIS SECURITY IS BEING ISSUED WITH ORIGINAL ISSUE
     DISCOUNT; FOR EACH $1,000 PRINCIPAL AMOUNT OF THIS SECURITY, THE ISSUE
     PRICE IS $597.65, THE AMOUNT OF ORIGINAL ISSUE DISCOUNT IS $933.60, THE
     ISSUE DATE IS NOVEMBER 25, 1997 AND THE YIELD TO MATURITY IS 10 5/8% PER
     ANNUM.

                                                       CUSIP/CINS  ____________

                    10 5/8% Senior Discount Notes due 2007

No. 1                                  Principal Amount at Maturity $250,800,000

                       CROWN CASTLE INTERNATIONAL CORP.

promises to pay to  Cede & Co., or registered assigns, the principal sum of TWO
HUNDRED FIFTY MILLION EIGHT HUNDRED THOUSAND Dollars on November 15, 2007.

Interest Payment Dates: May 15 and November 15, commencing May 15, 2003

Record Dates:  May 1 and November 1

                                        Dated:  November __, 1997

                                        Crown Castle International Corp.

                                        By:______________________________
                                           Name:
                                           Title:
 
                                                        (SEAL)

This is one of the Global
Notes referred to in the
within-mentioned Indenture:

United States Trust Company of New York,
as Trustee
By:______________________________

================================================================================

                                      A1-1
<PAGE>
 
                                (Back of Note)

                    _______ Senior Discount Notes due 2007

     THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THIS INDENTURE
     GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE
     BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY
     CIRCUMSTANCES EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS
     MAY BE REQUIRED PURSUANT TO SECTION 2.07 OF THIS INDENTURE, (II) THIS
     GLOBAL NOTE MAY BE EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION
     2.06(a) OF THIS INDENTURE, (III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE
     TRUSTEE FOR CANCELLATION PURSUANT TO SECTION 2.11 OF THIS INDENTURE AND
     (IV) THIS GLOBAL NOTE MAY BE TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE
     PRIOR WRITTEN CONSENT OF THE COMPANY.

     THE SECURITY (OR ITS PREDECESSOR) EVIDENCED HEREBY WAS ORIGINALLY ISSUED IN
     A TRANSACTION EXEMPT FROM REGISTRATION UNDER SECTION 5 OF THE UNITED STATES
     SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND THE SECURITY
     EVIDENCED HEREBY MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE
     ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM.  EACH
     PURCHASER OF THE SECURITY EVIDENCED HEREBY IS HEREBY NOTIFIED THAT THE
     SELLER MAY BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF
     THE SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER.  THE HOLDER OF THE
     SECURITY EVIDENCED HEREBY AGREES FOR THE BENEFIT OF THE COMPANY THAT (A)
     SUCH SECURITY MAY BE RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (1)(a)
     TO A PERSON WHO THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL
     BUYER (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) IN A TRANSACTION
     MEETING THE REQUIREMENTS OF RULE 144A, (b) IN A TRANSACTION MEETING THE
     REQUIREMENTS OF RULE 144 UNDER THE SECURITIES ACT, (c) OUTSIDE THE UNITED
     STATES TO A FOREIGN PERSON IN A TRANSACTION MEETING THE REQUIREMENTS OF
     RULE 904 UNDER THE SECURITIES ACT OR (d) IN ACCORDANCE WITH ANOTHER
     EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT (AND
     BASED UPON AN OPINION OF COUNSEL IF THE COMPANY SO REQUESTS), (2) TO THE
     COMPANY OR (3) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT AND, IN EACH
     CASE, IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE
     UNITED STATES OR ANY OTHER APPLICABLE JURISDICTION AND (B) THE HOLDER WILL,
     AND EACH SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER FROM IT OF
     THE SECURITY EVIDENCED HEREBY OF THE RESALE RESTRICTIONS SET FORTH IN (A)
     ABOVE.

          Capitalized terms used herein shall have the meanings assigned to them
in the Indenture referred to below unless otherwise indicated.

          1.  INTEREST. Crown Castle International Corp., a Delaware corporation
(the "Company"), promises to pay interest on the principal amount of this Note
at _______ per annum from November 16, 2002 until maturity and shall pay the
Liquidated Damages, if any, payable pursuant to Section 5 of the

                                     A1-2
<PAGE>
 
Registration Rights Agreement referred to below. The Company will pay interest
and Liquidated Damages, if any, semi-annually on May 15 and November 15 of each
year, or if any such day is not a Business Day, on the next succeeding Business
Day (each an "Interest Payment Date"); provided that the first such interest
payment date shall be May 15, 2003. Interest on the Notes will accrue from the
most recent date to which interest has been paid or, if no interest has been
paid, from November 15, 2002. The Company shall pay interest (including post-
petition interest in any proceeding under any Bankruptcy Law) on overdue
principal and premium, if any, from time to time on demand at a rate that is 1%
per annum in excess of the rate then in effect; it shall pay interest (including
post-petition interest in any proceeding under any Bankruptcy Law) on overdue
installments of interest and Liquidated Damages (without regard to any
applicable grace periods) from time to time on demand at the same rate to the
extent lawful. Interest will be computed on the basis of a 360-day year of
twelve 30-day months.

          2.  Method of Payment. The Company will pay interest on the Notes
(except defaulted interest) and Liquidated Damages to the Persons who are
registered Holders of Notes at the close of business on the May 1 or November 1
next preceding the Interest Payment Date, even if such Notes are canceled after
such record date and on or before such Interest Payment Date, except as provided
in Section 2.12 of the Indenture with respect to defaulted interest. The Notes
will be payable as to principal, premium and Liquidated Damages, if any, and
interest at the office or agency of the Company maintained for such purpose
within or without the City and State of New York, or, at the option of the
Company, payment of interest and Liquidated Damages may be made by check mailed
to the Holders at their addresses set forth in the register of Holders, and
provided that payment by wire transfer of immediately available funds will be
required with respect to principal of and interest, premium and Liquidated
Damages on, all Global Notes and all other Notes the Holders of which shall have
provided wire transfer instructions to the Company or the Paying Agent. Such
payment shall be in such coin or currency of the United States of America as at
the time of payment is legal tender for payment of public and private debts;
provided that Liquidated Damages may be paid through the issuance of additional
Notes having an Accreted Value at the time of issuance equal to the amount of
Liquidated Damages so paid.

          3.  Paying Agent and Registrar. Initially, United States Trust Company
of New York, the Trustee under the Indenture, will act as Paying Agent and
Registrar. The Company may change any Paying Agent or Registrar without notice
to any Holder. The Company or any of its Subsidiaries may act in any such
capacity.*

          4.  Indenture. The Company issued the Notes under an Indenture dated
as of November 25, 1997 ("Indenture") between the Company and the Trustee. The
terms of the Notes include those stated in the Indenture and those made part of
the Indenture by reference to the Trust Indenture Act of 1939, as amended (15
U.S. Code (S)(S) 77aaa-77bbbb). The Notes are subject to all such terms, and
Holders are referred to the Indenture and such Act for a statement of such
terms. To the extent any provision of this Note conflicts with the express
provisions of the Indenture, the provisions of the Indenture shall govern and be
controlling. The Notes are obligations of the Company limited to $251.0 million
in aggregate principal amount at maturity, plus amounts, if any, issued to pay
Liquidated Damages on outstanding Notes as set forth in Paragraph 2 hereof.

          5.  Optional Redemption.

                                     A1-3
<PAGE>
 
          (a) Except as Set Forth in subparagraph (b) of this Paragraph 5, the
Company shall not have the option to redeem the Notes pursuant to this Section
3.07 prior to November 15, 2002.  Thereafter, the Company shall have the option
to redeem the Notes, in whole or in part, at the redemption prices (expressed as
percentages of principal amount) set forth below plus accrued and unpaid
interest and Liquidated Damages thereon, if any, to the applicable redemption
date (subject to the right of Holders of record on the relevant date to
receive interest and Liquidated Damages due on the relevant interest payment
date), if redeemed during the twelve-month period beginning on November 15 of
the years indicated below:

<TABLE> 
<CAPTION> 
     YEAR                        PERCENTAGE   
     -----                       -----------  
     <S>                         <C>          
          2002......................105.313%  
          2003......................103.542   
          2004......................101.771   
          2005 and thereafter.......100.000    
</TABLE>

          (b) Notwithstanding the provisions of subparagraph (a) of this
Paragraph 5, during the first 36 months after the date of original issuance of
the Notes, the Company may on any one or more occasions redeem up to 35% of the
aggregate principal amount at maturity of Notes originally issued at a
redemption price equal to 110.625% of the Accreted Value thereof on the
redemption date, plus Liquidated Damages thereon, if any, to the redemption date
(subject to the right of Holders of record on the relevant record date to
receive Liquidated Damages, if any, due on the relevant interest payment date),
with the net cash proceeds of one or more Public Equity Offerings and/or
Strategic Equity Investments; provided that at least 65% of the aggregate
principal amount at maturity of Notes originally issued remains outstanding
immediately after the occurrence of such redemption (excluding Notes held by the
Company or any of its Subsidiaries);and provided, further, that such redemption
shall occur within 60 days of the date of the closing of such Public Equity
Offering and/or Strategic Equity Investment.

          6.  Mandatory Redemption.

          Except as set forth in paragraph 7 below, the Company shall not be
required to make mandatory redemption payments with respect to the Notes.

          7.  Repurchase at Option of Holder.

          (a) Upon the occurrence of a Change of Control, each Holder of Notes
shall have the right to require the Company to repurchase all or any part (equal
to $1,000 or an integral multiple thereof) of such Holder's Notes pursuant to
the offer described below (the "Change of Control Offer") at an offer price in
cash equal to 101% of the aggregate principal amount thereof plus accrued and
unpaid interest and Liquidated Damages thereon, if any (subject to the right of
Holders of record on the relevant record date to receive interest and Liquidated
Damages, if any, due on the relevant interest payment date), to the date of
purchase or, in the case of repurchases of Notes prior to the Full Accretion
Date, at a purchase price equal to 101% of the Accreted Value thereof on the
date of repurchase plus Liquidated Damages thereon, if any (subject to the right
of Holders of record on the relevant record date to receive Liquidated Damages,
if any, due on the relevant interest payment date), to such date of repurchase
(the "Change of Control Payment").  Within 30 days following any Change of
Control, the Company shall mail a notice to each Holder setting forth the
procedures governing the Change of Control Offer as required by the Indenture.

                                     A1-4
<PAGE>
 
          (b) If the Company or a Restricted Subsidiary consummates any Asset
Sales, within five days of each date on which the aggregate amount of Excess
Proceeds exceeds $5 million, the Company shall commence an offer to all Holders
of Notes (an "Asset Sale Offer") pursuant to Section 3.09 of the Indenture to
purchase the maximum principal amount (or accreted value, as applicable) of
Notes and such other senior Indebtedness of the Company that may be purchased
out of the Excess Proceeds, at an offer price in cash in an amount equal to 100%
of the principal amount (or accreted value, as applicable) thereof plus accrued
and unpaid interest and Liquidated Damages thereon, if any, to the date of
purchase (subject to the right of Holders of record on the relevant record date
to receive interest and Liquidated Damages, if any, due on the relevant interest
payment date), in accordance with the procedures set forth in the Indenture and
such other senior Indebtedness of the Company.  To the extent that any Excess
Proceeds remain after consummation of an Asset Sale Offer, the Company may use
such Excess Proceeds for any purpose not otherwise prohibited by the Indenture.
If the aggregate principal amount of Notes and such other senior Indebtedness of
the Company tendered into such Asset Sale Offer surrendered by Holders thereof
exceeds the amount of Excess Proceeds, the Trustee shall select the Notes and
such other senior Indebtedness to be purchased on a pro rata basis.  Upon
completion of such offer to purchase, the amount of Excess Proceeds shall be
reset to zero.  Holders of Notes that are the subject of an offer to purchase
will receive an Asset Sale Offer from the Company prior to any related purchase
date and may elect to have such Notes purchased by completing the form entitled
"Option of Holder to Elect Purchase" on the reverse of the Notes.

          8.  Notice of Redemption.  Notice of redemption will be mailed at
least 30 days but not more than 60 days before the redemption date to each
Holder whose Notes are to be redeemed at its registered address.  Notes in
denominations larger than $1,000 may be redeemed in part but only in whole
multiples of $1,000, unless all of the Notes held by a Holder are to be
redeemed.  On and after the redemption date interest ceases to accrue on Notes
or portions thereof called for redemption.

          9.  Denominations, Transfer, Exchange.  The Notes are in registered
form without coupons in denominations of $1,000 and integral multiples of
$1,000.  The transfer of Notes may be registered and Notes may be exchanged as
provided in the Indenture.  The Registrar and the Trustee may require a Holder,
among other things, to furnish appropriate endorsements and transfer documents
and the Company may require a Holder to pay any taxes and fees required by law
or permitted by the Indenture.  The Company need not exchange or register the
transfer of any Note or portion of a Note selected for redemption, except for
the unredeemed portion of any Note being redeemed in part.  Also, the Company
need not exchange or register the transfer of any Notes for a period of 15 days
before a selection of Notes to be redeemed or during the period between a record
date and the corresponding Interest Payment Date.

          10. Persons Deemed Owners. The registered Holder of a Note may be
treated as its owner for all purposes.

          11. Amendment, Supplement and Waiver.  Subject to certain exceptions,
the Indenture or the Notes may be amended or supplemented with the consent of
the Holders of at least a majority in principal amount at maturity of the then
outstanding Notes voting as a single class, and any existing default or
compliance with any provision of the Indenture or the Notes may be waived with
the consent of the Holders of a majority in principal amount at maturity of the
then outstanding Notes voting as a single class.  Without the consent of any
Holder of a Note, the Indenture or the Notes may be amended or supplemented to
cure any ambiguity, defect or inconsistency, to provide for uncertificated Notes
in addition to or in place of certificated Notes, to provide for the assumption
of the Company's obligations to Holders of the Notes in case of a merger or
consolidation, to make any change that would provide any additional rights or
benefits to the Holders of the Notes or that does not

                                     A1-5
<PAGE>
 
adversely affect the legal rights under the Indenture of any such Holder, to
comply with the requirements of the Commission in order to effect or maintain
the qualification of the Indenture under the Trust Indenture Act.

          12.  Defaults and Remedies.  Events of Default include: (i) default
for 30 days in the payment when due of interest or Liquidated Damages on the
Notes; (ii) default in payment when due of principal of or premium, if any, on
the Notes when the same becomes due and payable at maturity, upon redemption
(including in connection with an offer to purchase) or otherwise, (iii) failure
by the Company to comply with Section 4.07, 4.09, 4.10 or 5.01 of the Indenture;
(iv) failure by the Company for 60 days after notice to the Company by the
Trustee or the Holders of at least 25% in principal amount at maturity of the
Notes then outstanding voting as a single class to comply with certain other
agreements in the Indenture or the Notes; (v) default under certain other
agreements relating to Indebtedness of the Company which default (vi) certain
final judgments for the payment of money that remain undischarged for a period
of 60 days; and (vii) certain events of bankruptcy or insolvency with respect to
the Company or any of its Significant Subsidiaries. If any Event of Default
occurs and is continuing, the Trustee or the Holders of at least 25% in
principal amount at maturity of the then outstanding Notes may declare all the
Notes to be due and payable. Notwithstanding the foregoing, in the case of an
Event of Default arising from certain events of bankruptcy or insolvency, all
outstanding Notes will become due and payable without further action or notice.
Holders may not enforce the Indenture or the Notes except as provided in the
Indenture. Subject to certain limitations, Holders of a majority in principal
amount at maturity of the then outstanding Notes may direct the Trustee in its
exercise of any trust or power. The Trustee may withhold from Holders of the
Notes notice of any continuing Default or Event of Default (except a Default or
Event of Default relating to the payment of principal or interest) if it
determines that withholding notice is in their interest. The Holders of a
majority in aggregate principal amount at maturity of the Notes then outstanding
by notice to the Trustee may on behalf of the Holders of all of the Notes waive
any existing Default or Event of Default and its consequences under the
Indenture except a continuing Default or Event of Default in the payment of
interest on, or the principal of, the Notes. The Company is required to deliver
to the Trustee annually a statement regarding compliance with the Indenture, and
the Company is required upon becoming aware of any Default or Event of Default,
to deliver to the Trustee a statement specifying such Default or Event of
Default.

          13.  Trustee Dealings with Company.  The Trustee, in its individual or
any other capacity, may make loans to, accept deposits from, and perform
services for the Company or its Affiliates, and may otherwise deal with the
Company or its Affiliates, as if it were not the Trustee.

          14.  No Recourse Against Others.  A director, officer, employee,
incorporator or stockholder, of the Company, as such, shall not have any
liability for any obligations of the Company under the Notes or the Indenture or
for any claim based on, in respect of, or by reason of, such obligations or
their creation.  Each Holder by accepting a Note waives and releases all such
liability.  The waiver and release are part of the consideration for the
issuance of the Notes.

          15.  Authentication. This Note shall not be valid until authenticated
by the manual signature of the Trustee or an authenticating agent.

          16.  Abbreviations.  Customary abbreviations may be used in the name
of a Holder or an assignee, such as:  TEN COM (= tenants in common), TEN ENT (=
tenants by the entireties), JT TEN (= joint tenants with right of survivorship
and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts
to Minors Act).

                                     A1-6
<PAGE>
 
          17.  Additional Rights of Holders of Restricted Global Notes and
Restricted Definitive Notes.  In addition to the rights provided to Holders of
Notes under the Indenture, Holders of Restricted Global Notes and Restricted
Definitive Notes shall have all the rights set forth in the A/B Exchange
Registration Rights Agreement dated as of November __, 1997, between the Company
and the parties named on the signature pages thereof (the "Registration Rights
Agreement").

          18.  Cusip Numbers.  Pursuant to a recommendation promulgated by the
Committee on Uniform Security Identification Procedures, the Company has caused
CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP numbers
in notices of redemption as a convenience to Holders.  No representation is made
as to the accuracy of such numbers either as printed on the Notes or as
contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

                                     A1-7
<PAGE>
 
          The Company will furnish to any Holder upon written request and
without charge a copy of the Indenture and/or the Registration Rights Agreement.
Requests may be made to:

          Crown Castle International Corp.
          510 Bering Drive, Suite 500
          Houston, TX  77057
          Attention:  Chief Financial Officer

                                     A1-8
<PAGE>
 
                                ASSIGNMENT FORM

To assign this Note, fill in the form below: (I) or (we) assign and transfer
this Note to

________________________________________________________________________________
                 (Insert assignee's soc. sec. or tax I.D. no.)

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________
(Print or type assignee's name, address and zip code)

and irrevocably appoint to 
transfer this Note on the books of the Company. The agent may substitute another
to act for him.

________________________________________________________________________________

Date:_____________

                                    Your Signature:__________________________
                                    (Sign exactly as your name appears on the
                                    face of this Note)

SIGNATURE GUARANTEE.


                                     A1-9
<PAGE>
 
                      OPTION OF HOLDER TO ELECT PURCHASE

          If you want to elect to have this Note purchased by the Company
pursuant to Section 4.10 or 4.15 of the Indenture, check the box below:

          [_]  Section 4.10     [_]  Section 4.15

          If you want to elect to have only part of the Note purchased by the
Company pursuant to Section 4.10 or Section 4.15 of the Indenture, state the
amount you elect to have purchased: $________



Date:______                            Your Signature:__________________________
                                              (Sign exactly as your name appears
                                               on the Note)

                                        Tax Identification No:__________________

Signature Guarantee.

                                     A1-10
<PAGE>
 
             SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL NOTE

          The following exchanges of a part of this Global Note for an interest
in another Global Note or for a Definitive Note, or exchanges of a part of
another Global Note or Definitive Note for an interest in this Global Note, have
been made:

<TABLE>
<CAPTION>
                                                               Principal Amount
                   Amount of decrease                          at maturity of      Signature of  
                           in           Amount of increase    this Global Note      authorized     
                    Principal Amount    in Principal Amount    following such       officer of     
                     at maturity of       at maturity of        decrease (or     Trustee or Note   
Date of Exchange    this Global Note     this Global Note         increase)          Custodian     
- ----------------   -------------------  -------------------   ----------------   ----------------- 
<S>                <C>                  <C>                   <C>                <C> 
</TABLE>

                                     A1-11
<PAGE>
 
                                  EXHIBIT A-2

                  (Face of Regulation S Temporary Global Note)
================================================================================

     FOR THE PURPOSES OF SECTIONS 1272, 1273 AND 1275 OF THE INTERNAL REVENUE
     CODE OF 1986, AS AMENDED, THIS SECURITY IS BEING ISSUED WITH ORIGINAL ISSUE
     DISCOUNT; FOR EACH $1,000 PRINCIPAL AMOUNT OF THIS SECURITY, THE ISSUE
     PRICE IS $597.65, THE AMOUNT OF ORIGINAL ISSUE DISCOUNT IS $933.60, THE
     ISSUE DATE IS NOVEMBER 25, 1997 AND THE YIELD TO MATURITY IS 10 5/8% PER
     ANNUM.

                                                                      CUSIP/CINS

                    _______ Senior Discount Notes due 2007

No. __                         Principal Amount at Maturity _______

                        CROWN CASTLE INTERNATIONAL CORP.

promises to pay to or registered assigns, the 
principal sum of 
Dollars on November 15, 2007.

Interest Payment Dates: and 

Record Dates: and 

                                                        Dated: __,1997

                                    CROWN CASTLE INTERNATIONAL CORP.


                                    By:_________________________________
                                       Name:
                                       Title:

                                                    (SEAL)

This is one of the Global
Notes referred to in the
within-mentioned Indenture:

United States Trust Company of New York,
as Trustee
By:______________________________________

================================================================================

                                     A2-1
<PAGE>
 
                  (Back of Regulations Temporary Global Note)

                    _______ Senior Discount Notes due 2007

THE RIGHTS ATTACHING TO THIS REGULATION S TEMPORARY GLOBAL NOTE, AND THE
CONDITIONS AND PROCEDURES GOVERNING ITS EXCHANGE FOR CERTIFICATED NOTES, ARE AS
SPECIFIED IN THE INDENTURE (AS DEFINED HEREIN).  NEITHER THE HOLDER NOR THE
BENEFICIAL OWNERS OF THIS REGULATION S TEMPORARY GLOBAL NOTE SHALL BE ENTITLED
TO RECEIVE PAYMENT OF INTEREST HEREON.

UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR NOTES IN DEFINITIVE
FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A
NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR
ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY OR ANY SUCH NOMINEE TO A
SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY.  UNLESS THIS
CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST
COMPANY (55 WATER STREET, NEW YORK, NEW YORK) ("DTC"), TO THE COMPANY OR ITS
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE
ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS MAY BE
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO
CEDE & CO. OR SUCH OTHER ENTITY AS MAY BE REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER
HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

THE NOTE (OR ITS PREDECESSOR) EVIDENCED HEREBY WAS ORIGINALLY ISSUED IN A
TRANSACTION EXEMPT FROM REGISTRATION UNDER SECTION 5 OF THE UNITED STATES
SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND THE NOTE
EVIDENCED HEREBY MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE
ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM.  EACH
PURCHASER OF THE NOTE EVIDENCED HEREBY IS HEREBY NOTIFIED THAT THE SELLER MAY BE
RELYING ON THE EXEMPTION PROVIDED BY RULE 144A UNDER THE SECURITIES ACT.  THE
HOLDER OF THE NOTE EVIDENCED HEREBY AGREES FOR THE BENEFIT OF THE COMPANY THAT
(A) SUCH NOTE MAY BE RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (1) (a) TO A
PERSON WHO THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER (AS
DEFINED IN OF RULE 144A UNDER THE SECURITIES ACT) IN A TRANSACTION MEETING THE
REQUIREMENTS OF RULE 144A, (b) IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE
144 UNDER THE SECURITIES ACT, (c) OUTSIDE THE UNITED STATES TO A FOREIGN PERSON
IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 904 UNDER THE SECURITIES ACT
OR (d) IN ACCORDANCE WITH ANOTHER EXEMPTION FROM THE REGISTRATION REQUIREMENTS
OF THE SECURITIES ACT (AND BASED UPON AN OPINION OF COUNSEL IF THE COMPANY SO
REQUESTS), (2) TO THE COMPANY OR (3) PURSUANT TO AN EFFECTIVE REGISTRATION
STATEMENT AND, IN EACH CASE, IN ACCORDANCE WITH THE APPLICABLE SECURITIES LAWS
OF ANY STATE OF THE UNITED STATES OR ANY OTHER APPLICABLE

                                     A2-2
<PAGE>
 
JURISDICTION AND (B) THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER IS REQUIRED TO,
NOTIFY ANY PURCHASER FROM IT OF THE SECURITY EVIDENCED HEREBY OF THE RESALE
RESTRICTIONS SET FORTH IN (1) ABOVE.

          Capitalized terms used herein shall have the meanings assigned to them
in the Indenture referred to below unless otherwise indicated.

          1.  Interest.  Crown Castle International Corp., a Delaware
corporation (the "Company"), promises to pay interest on the principal amount of
this Note at 10/5//8% per annum from November 16, 2002 until maturity and shall
pay the Liquidated Damages, if any, payable pursuant to Section 5 of the
Registration Rights Agreement referred to below. The Company will pay interest
and Liquidated Damages, semi-annually on and of each year, or if any such day is
not a Business Day, on the next succeeding Business Day (each an "Interest
Payment Date"). Interest on the Notes will accrue from the most recent date to
which interest has been paid or, if no interest has been paid, from the date of
issuance; provided that if there is no existing Default in the payment of
interest, and if this Note is authenticated between a record date referred to on
the face hereof and the next succeeding Interest Payment Date, interest shall
accrue from such next succeeding Interest Payment Date; provided, further, that
the first Interest Payment Date shall be _____, 199_. The Company shall pay
interest (including post-petition interest in any proceeding under any
Bankruptcy Law) on overdue principal and premium, if any, from time to time on
demand at a rate that is 1% per annum in excess of the rate then in effect; it
shall pay interest (including post-petition interest in any proceeding under any
Bankruptcy Law) on overdue installments of interest and Liquidated Damages
(without regard to any applicable grace periods) from time to time on demand at
the same rate to the extent lawful. Interest will be computed on the basis of a
360-day year of twelve 30-day months.

          Until this Regulation S Temporary Global Note is exchange for one or
more Regulation S Permanent Global Notes, the Holder hereof shall not be
entitled to receive payments of interest hereon; until so exchanged in full,
this Regulation S Temporary Global Note shall in all other respects be entitled
to the same benefits as other Senior Subordinated Notes under the Indenture.

          2.  Method of Payment.  The Company will pay interest on the Notes
(except defaulted interest) and Liquidated Damages to the Persons who are
registered Holders of Notes at the close of business on the or next preceding
the Interest Payment Date, even if such Notes are canceled after such record
date and on or before such Interest Payment Date, except as provided in Section
2.12 of the Indenture with respect to defaulted interest. The Notes will be
payable as to principal, premium if any interest Liquidated Damages, at the
office or agency of the Company maintained for such purpose within or without
the City and State of New York, or, at the option of the Company, payment of
interest and Liquidated Damages may be made by check mailed to the Holders at
their addresses set forth in the register of Holders, and provided that payment
by wire transfer of immediately available funds will be required with respect to
principal of and interest, premium and Liquidated Damages on, all Global Notes
and all other Notes the Holders of which shall have provided wire transfer
instructions to the Company or the Paying Agent. Such payment shall be in such
coin or currency of the United States of America as at the time of payment is
legal tender for payment of public and private debts; provided that Liquidated
Damages may be paid through the issuance of additional Notes having an Accreted
Value at the time of issuance equal to the amount of Liquidated Damages so paid.

                                     A2-3
<PAGE>
 
          3.  Paying Agent and Registrar.  Initially, United States Trust
Company of New York, the Trustee under the Indenture, will act as Paying Agent
and Registrar. The Company may change any Paying Agent or Registrar without
notice to any Holder. The Company or any of its Subsidiaries may act in any such
capacity.

          4.  Indenture.  The Company issued the Notes under an Indenture dated
as of November 1997 ("Indenture") between the Company and the Trustee. The
terms of the Notes include those stated in the Indenture and those made part of
the Indenture by reference to the Trust Indenture by reference to the Trust 
Indenture Act of 1939, as amended (15 U.S. Code (S)(S) 77aaa-77bbbb). The Notes
are subject to all such terms, and Holders are referred to the Indenture and
such Act for a statement of such terms. The Notes are secured obligations of the
Company limited to $_____ million in aggregate principal amount.

          5.  OPTIONAL REDEMPTION.

          (A) Except as set forth in Subparagraph (B) of this Paragraph 5, the 
Company shall not have the option to redeem the notes pursuant to this Section 
3.07 prior to ___________, 2002.  Thereafter, the Company shall have the option 
to redeem the notes, in whole or in part, at the redemption prices (expressed as
percentages of principal amount) set forth below plus accrued and unpaid
interest and Liquidated Damages thereon, if any, to the Applicable Redemption
date (subject to the right of Holders of record on the relevant record date to 
receive interest and Liquidated Damages due on the relevant interest payment
date), if redeemed during the Twelve-month period beginning on ___________ of 
the years indicated below:

<TABLE>
<CAPTION>
          YEAR                                       PERCENTAGE 
          ----                                       ---------- 
          <S>                                        <C>        
          2002.....................................  _______
          2003.....................................  _______    
          2004.....................................  _______    
          2005 and thereafter......................  100.000     
</TABLE>

          (B) Notwithstanding the provisions of Subparagraph (A) of this 
Paragraph 5, during the first 36 months after the date of original issuance of 
the motes, the Company may on any one or more occasions redeem up to 35% of the 
aggregate principal amount at maturity of notes originally issued at a 
redemption price equal to ________ of the accreted value thereof on the
redemption date, plus Liquidated Damages thereon, if any, to the redemption date
(subject to the right of Holders of record on the relevant record date to
receive Liquidated Damages, if any, due on the relevant interest payment date),
with the net cash proceeds of one or more Public Equity offerings and/or
Strategic Equity Investments; provided that at least 65% of the aggregate
principal amount at maturity of notes originally issued remains outstanding
immediately after the occurrence of such redemption (excluding notes held by the
Company or any of its Subsidiaries); and provided, further, that such redemption
shall occur within 60 days of the date of the closing of such Public Equity
offering and/or Strategic Equity Investment.

          6.  Mandatory Redemption.

          Except as set forth in paragraph 7 below, the Company shall not be
required to make mandatory redemption payments with respect to the Notes.

                                     A2-4
<PAGE>
 
          7.  Repurchase at Option of Holder.

          (a) Upon the occurrence of a Change of Control, each Holder of Notes
shall have the right to require the Company to repurchase all or any part (equal
to $1,000 or an integral multiple thereof) of such Holder's Notes pursuant to
the offer described below (the "Change of Control Offer") at an offer price in
cash equal to 101% of the aggregate principal amount thereof plus accrued and
unpaid interest and Liquidated Damages thereon, if any (subject to the right of
Holders of record on the relevant record date to receive interest and Liquidated
Damages, if any, due on the relevant interest payment date), to the date of
purchase or, in the case of repurchases of Notes prior to the Full Accretion
Date, at a purchase price equal to 101% of the Accreted Value thereof on the
date of repurchase plus Liquidated Damages thereon, if any (subject to the right
of Holders of record on the relevant record date to receive Liquidated Damages,
if any, due on the relevant interest payment date), to such date of repurchase
(the "Change of Control Payment").  Within 30 days following any Change of
Control, the Company shall mail a notice to each Holder setting forth the
procedures governing the Change of Control Offer as required by the Indenture.

          (b) If the Company or a Restricted Subsidiary consummates any Asset
Sales, within five days of each date on which the aggregate amount of Excess
Proceeds exceeds $5 million, the Company shall commence an offer to all Holders
of Notes (an "Asset Sale Offer") pursuant to Section 3.09 of the Indenture to
purchase the maximum principal amount (or accreted value, as applicable) of
Notes and such other senior Indebtedness of the Company that may be purchased
out of the Excess Proceeds, at an offer price in cash in an amount equal to 100%
of the principal amount (or accreted value, as applicable) thereof plus accrued
and unpaid interest and Liquidated Damages thereon, if any, to the date of
purchase (subject to the right of Holders of record on the relevant record date
to receive interest and Liquidated Damages, if any, due on the relevant interest
payment date), in accordance with the procedures set forth in the Indenture and
such other senior Indebtedness of the Company.  To the extent that any Excess
Proceeds remain after consummation of an Asset Sale Offer, the Company may use
such Excess Proceeds for any purpose not otherwise prohibited by the Indenture.
If the aggregate principal amount of Notes and such other senior Indebtedness of
the Company tendered into such Asset Sale Offer surrendered by Holders thereof
exceeds the amount of Excess Proceeds, the Trustee shall select the Notes and
such other senior Indebtedness to be purchased on a pro rata basis.  Holders of
Notes that are the subject of an offer to purchase will receive an Asset Sale
Offer from the Company prior to any related purchase date and may elect to have
such Notes purchased by completing the form entitled "Option of Holder to Elect
Purchase" on the reverse of the Notes.

          8.  Notice of Redemption.  Notice of redemption will be mailed at
least 30 days but not more than 60 days before the redemption date to each
Holder whose Notes are to be redeemed at its registered address.  Notes in
denominations larger than $1,000 may be redeemed in part but only in whole
multiples of $1,000, unless all of the Notes held by a Holder are to be
redeemed.  On and after the redemption date interest ceases to accrue on Notes
or portions thereof called for redemption.

          9.  Denominations, Transfer, Exchange.  The Notes are in registered
form without coupons in denominations of $1,000 and integral multiples of
$1,000.  The transfer of Notes may be registered and Notes may be exchanged as
provided in the Indenture.  The Registrar and the Trustee may require a Holder,
among other things, to furnish appropriate endorsements and transfer documents
and the Company may require a Holder to pay any taxes and fees required by law
or permitted by the Indenture.  The Company need not exchange or register the
transfer of any Note or portion of a Note selected for redemption, except for
the unredeemed portion of any Note being 

                                     A2-5
<PAGE>
 
redeemed in part. Also, it need not exchange or register the transfer of any
Notes for a period of 15 days before a selection of Notes to be redeemed or
during the period between a record date and the corresponding Interest Payment
Date.

          10.  Persons Deemed Owners.  The registered Holder of a Note may be
treated as its owner for all purposes. This Regulation S Temporary Global Note
is exchangeable in whole or in part for one or more Global Notes only (i) on or
after the termination of the 40-day restricted period (as defined in Regulation
S, and (ii) upon presentation of certificates (accompanied by an Opinion of
Counsel if applicable) required by Article 2 of the Indenture. Upon exchange of
this Regulation S Temporary Global Note for one or more Global Notes, the
Trustee shall cancel this Regulation S Temporary Global Note.

          11.  Amendment, Supplement and Waiver.  Subject to certain exceptions,
the Indenture or the Notes may be amended or supplemented with the consent of
the Holders of at least a majority in principal amount, of the then outstanding
Notes and any existing default or compliance with any provision of the Indenture
or the Notes may be waived with the consent of the Holders of a majority in
principal amount of the then outstanding Notes. Without the consent of any
Holder of a Note, the Indenture or the Notes may be amended or supplemented to
cure any ambiguity, defect or inconsistency, to provide for uncertificated Notes
in addition to or in place of certificated Notes, to provide for the assumption
of the Company's obligations to Holders of the Notes in case of a merger or
consolidation, to make any change that would provide any additional rights or
benefits to the Holders of the Notes or that does not adversely affect the legal
rights under the Indenture of any such Holder, to comply with the requirements
of the Commission in order to effect or maintain the qualification of the
Indenture under the Trust Indenture Act.

          12.  Defaults and Remedies.  Events of Default include: (i) default
for 30 days in the payment when due of interest or Liquidated Damages on the
Notes; (ii) default in payment when due of principal of or premium, if any, on
the Notes when the same becomes due and payable at maturity, upon redemption
(including in connection with an offer to purchase) or otherwise, (iii) failure
by the Company to comply with Section 4.9, 4.10 or 5.01 of the Indenture which
failure remains incured for 30 days; (iv) failure by the Company for 60 days
after notice to the Company by the Trustee or the Holders of at least 25% in
principal amount of the Notes then outstanding to comply with certain other
agreements in the Indenture' or the Notes or the Pledge Agreement; (v) default
under certain other agreements relating to Indebtedness of the Company which
default which results in the acceleration of such Indebtedness prior to its
express maturity; (vi) certain final judgments for the payment of money that
remain undischarged for a period of 60 days; and (vii) certain events of
bankruptcy or insolvency with respect to the Company or any of its Material
Subsidiaries; and (viii) the breach of certain covenants in the Pledge Agreement
or the Pledge Agreement shall be held in any judicial proceeding to be
unenforceable or invalid or shall cease for any reason to be in full force and
effect. If any Event of Default occurs and is continuing, the Trustee or the
Holders of at least 25% in principal amount at maturity of the then outstanding
Notes may declare all the Notes to be due and payable. Notwithstanding the
foregoing, in the case of an Event of Default arising from certain events of
bankruptcy or insolvency, all outstanding Notes will become due and payable
without further action or notice. Holders may not enforce the Indenture or the
Notes except as provided in the Indenture. Subject to certain limitations,
Holders of a majority in principal amount of the then outstanding Notes may
direct the Trustee in its exercise of any trust or power. The Trustee may
withhold from Holders of

                                     A2-6
<PAGE>
 
the Notes notice of any continuing Default or Event of Default (except a Default
or Event of Default relating to the payment of principal or interest) if it
determines that withholding notice is in their interest. The Holders of a
majority in aggregate principal amount of the Notes then outstanding by notice
to the Trustee may on behalf of the Holders of all of the Notes waive any
existing Default or Event of Default and its consequences under the Indenture
except a continuing Default or Event of Default in the payment of interest on,
or the principal of, the Notes. The Company is required to deliver to the
Trustee annually a statement regarding compliance with the Indenture, and the
Company is required upon becoming aware of any Default or Event of Default, to
deliver to the Trustee a statement specifying such Default or Event of Default.

          13.  Trustee Dealings with Company.  The Trustee, in its individual or
any other capacity, may make loans to, accept deposits from, and perform
services for the Company or its Affiliates, and may otherwise deal with the
Company or its Affiliates, as if it were not the Trustee.

          14.  No Recourse Against Others.  A director, officer, employee,
incorporator or stockholder, of the Company, as such, shall not have any
liability for any obligations of the Company under the Notes or the Indenture or
for any claim based on, in respect of, or by reason of, such obligations or
their creation.  Each Holder by accepting a Note waives and releases all such
liability.  The waiver and release are part of the consideration for the
issuance of the Notes.

          15.  Authentication.  This Note shall not be valid until authenticated
by the manual signature of the Trustee or an authenticating agent.

          16.  Abbreviations.  Customary abbreviations may be used in the name
of a Holder or an assignee, such as:  TEN COM (= tenants in common), TEN ENT (=
tenants by the entireties), JT TEN (= joint tenants with right of survivorship
and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts
to Minors Act).

          17.  Additional Rights of Holders of Restricted Global Notes and
Restricted Definitive Notes.  In addition to the rights provided to Holders of
Notes under the Indenture, Holders of Restricted Global Notes and Restricted
Definitive Notes shall have all the rights set forth in the A/B Exchange
Registration Rights Agreement dated as of ___________, 1997, between the Company
and the parties named on the signature pages thereof (the "Registration Rights
Agreement").

          18.  CUSIP Numbers.  Pursuant to a recommendation promulgated by the
Committee on Uniform Security Identification Procedures, the Company has caused
CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP numbers
in notices of redemption as a convenience to Holders.  No representation is made
as to the accuracy of such numbers either as printed on the Notes or as
contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

          The Company will furnish to any Holder upon written request and
without charge a copy of the Indenture and/or the Registration Rights Agreement.
Requests may be made to:

               Crown Castle International Corp.

               510 Bering Drive, Suite 500
               Houston, TX  77057
               Attention:  Chief Financial Officer

                                     A2-7
<PAGE>
 
                                ASSIGNMENT FORM

To assign this Note, fill in the form below: (I) or (we) assign and transfer
this Note to

________________________________________________________________________________
                 (Insert assignee's soc. sec. or tax I.D. no.)


________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________
     (Print or type assignee's name, address and zip code)

and irrevocably appoint_________________________________________________________
to transfer this Note on the books of the Company. The agent may substitute
another to act for him.

________________________________________________________________________________

Date: __________

                                    Your Signature: ____________________________
(Sign exactly as your name appears on the face of this Note)

Signature Guarantee.

                                     A2-8
<PAGE>
 
                      OPTION OF HOLDER TO ELECT PURCHASE

          If you want to elect to have this Note purchased by the Company
pursuant to Section 4.10 or 4.15 of the Indenture, check the box below:

     [_]  Section 4.10        [_]  Section 4.15

          If you want to elect to have only part of the Note purchased by the
Company pursuant to Section 4.10 or Section 4.15 of the Indenture, state the
amount you elect to have purchased: $________


________________________________________________________________________________

Date: _____________                    Your Signature: _________________________
(Sign exactly as your name appears on the Note)

                                       Tax Identification No: ___________

Signature Guarantee.

                                     A2-9
<PAGE>
 
       SCHEDULE OF EXCHANGES OF REGULATIONS S TEMPORARY GLOBAL  NOTE

          The following exchanges of this in Regulation S Temporary Global for
an interest in another Global Note, or of other Restricted Global Notes for an
interest in Regulation S Temporary Global Note have been made:

<TABLE>
<CAPTION>
                                                              Principal Amount
                        Amount of       Amount of increase     at maturity of
                       decrease in         in Principal       this Global Note         Signature of
                    Principal Amount         Amount            following such        authorized officer
                     at maturity of       at maturity of        decrease (or          of Trustee or
Date of Exchange    this Global Note     this Global Note         increase)           Note Custodian
- -----------------  -------------------  -------------------   -----------------     -------------------
<S>                <C>                  <C>                   <C>                   <C> 
</TABLE>

                                     A2-10
<PAGE>
 
                                   EXHIBIT B

                        FORM OF CERTIFICATE OF TRANSFER

Crown Castle International Corp.
510 Bering Drive, Suite 500
Houston, TX  77057

[Registrar address block]

          Re:  ___% Senior Discount Notes Due 2007
               -----------------------------------

          Reference is hereby made to the Indenture, dated as of November ___,
1997 (the "Indenture"), between Crown Castle International Corp., as issuer (the
           ---------                                                            
"Company"), and United States Trust Company of New York, as trustee.
 -------                                                             
Capitalized terms used but not defined herein shall have the meanings given to
them in the Indenture.

          ______________, (the "Transferor") owns and proposes to transfer the
                                ----------                                    
Note[s] or interest in such Note[s] specified in Annex A hereto, in the
principal amount of $___________ in such Note[s] or interests (the "Transfer"),
                                                                    --------   
to  __________ (the "Transferee"), as further specified in Annex A hereto.  In
                     ----------                                               
connection with the Transfer, the Transferor hereby certifies that:

[CHECK ALL THAT APPLY]

1.   [_]  check if transferee will take delivery of a beneficial interest in the
          ----------------------------------------------------------------------
144a global note or a definitive note pursuant to rule 144a.  The Transfer is
- -----------------------------------------------------------                  
being effected pursuant to and in accordance with Rule 144A under the United
States Securities Act of 1933, as amended (the "Securities Act"), and,
                                                ---------- ---        
accordingly, the Transferor hereby further certifies that the beneficial
interest or Definitive Note is being transferred to a Person that the Transferor
reasonably believed and believes is purchasing the beneficial interest or
Definitive Note for its own account, or for one or more accounts with respect to
which such Person exercises sole investment discretion, and such Person and each
such account is a "qualified institutional buyer" within the meaning of Rule
144A in a transaction meeting the requirements of Rule 144A and such Transfer is
in compliance with any applicable blue sky securities laws of any state of the
United States.  Upon consummation of the proposed Transfer in accordance with
the terms of the Indenture, the transferred beneficial interest or Definitive
Note will be subject to the restrictions on transfer enumerated in the Private
Placement Legend printed on the 144A Global Note and/or the Definitive Note and
in the Indenture and the Securities Act.

2.   [_]  check if transferee will take delivery of a beneficial interest in the
          ----------------------------------------------------------------------
temporary regulation s global note, the regulation s global note or a definitive
- --------------------------------------------------------------------------------
note pursuant to regulation s.  The Transfer is being effected pursuant to and
- -----------------------------                                                 
in accordance with Rule 903 or Rule 904 under the Securities Act and,
accordingly, the Transferor hereby further certifies that (i) the Transfer is
not being made to a person in the United States and (x) at the time the buy
order was originated, the Transferee was outside the United States or such
Transferor and any Person acting on its behalf reasonably believed and believes
that the Transferee was outside the United States or (y) the transaction was
executed in, on or through the facilities of a designated offshore securities
market and neither such Transferor nor any Person acting on its behalf knows
that the transaction was prearranged with a buyer 

                                      B-1
<PAGE>
 
in the United States, (ii) no directed selling efforts have been made in
contravention of the requirements of Rule 903(b) or Rule 904(b) of Regulation S
under the Securities Act (iii) the transaction is not part of a plan or scheme
to evade the registration requirements of the Securities Act and (iv) if the
proposed transfer is being made prior to the expiration of the Restricted
Period, the transfer is not being made to a U.S. Person or for the account or
benefit of a U.S. Person (other than an Initial Purchaser). Upon consummation of
the proposed transfer in accordance with the terms of the Indenture, the
transferred beneficial interest or Definitive Note will be subject to the
restrictions on Transfer enumerated in the Private Placement Legend printed on
the Regulation S Global Note, the Temporary Regulation S Global Note and/or the
Definitive Note and in the Indenture and the Securities Act.

3.   [_]  check and complete if transferee will take delivery of a beneficial
          -------------------------------------------------------------------
interest in a 144a global note or a definitive note pursuant to any provision of
- --------------------------------------------------------------------------------
the securities act other than rule 144a or regulation s.  The Transfer is being
- -------------------------------------------------------                        
effected in compliance with the transfer restrictions applicable to beneficial
interests in Restricted Global Notes and Restricted Definitive Notes and
pursuant to and in accordance with the Securities Act and any applicable blue
sky securities laws of any state of the United States, and accordingly the
Transferor hereby further certifies that (check one):

          (a) [_] such Transfer is being effected pursuant to and in accordance
with Rule 144 under the Securities Act;

                                       or

          (b) [_] such Transfer is being effected to the Company or a subsidiary
thereof;

                                       or
          
          (c) [_] such Transfer is being effected pursuant to an effective
registration statement under the Securities Act and in compliance with the
prospectus delivery requirements of the Securities Act.

4.   [_]  check if Transferee will take delivery of a beneficial interest in an
Unrestricted Global Note or of an Unrestricted Definitive Note.

          (a) [_] check if transfer is pursuant to rule 144. (i) The Transfer is
being effected pursuant to and in accordance with Rule 144 under the Securities
Act and in compliance with the transfer restrictions contained in the Indenture
and any applicable blue sky securities laws of any state of the United States
and (ii) the restrictions on transfer contained in the Indenture and the Private
Placement Legend are not required in order to maintain compliance with the
Securities Act. Upon consummation of the proposed Transfer in accordance with
the terms of the Indenture, the transferred beneficial interest or Definitive
Note will no longer be subject to the restrictions on transfer enumerated in the
Private Placement Legend printed on the Restricted Global Notes, on Restricted
Definitive Notes and in the Indenture.

          (b) [_] check if transfer is pursuant to regulation S. (i) The
Transfer is being effected pursuant to and in accordance with Rule 903 or Rule
904 under the Securities Act and in compliance with the transfer restrictions
contained in the Indenture and any applicable blue sky securities laws of any
state of the United States and (ii) the restrictions on transfer contained in
the
                                      B-2
<PAGE>
 
Indenture and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act. Upon consummation of the proposed Transfer
in accordance with the terms of the Indenture, the transferred beneficial
interest or Definitive Note will no longer be subject to the restrictions on
transfer enumerated in the Private Placement Legend printed on the Restricted
Global Notes, on Restricted Definitive Notes and in the Indenture.

          (c) [_]  check if transfer is pursuant to other exemption.  (i) The
Transfer is being effected pursuant to and in compliance with an exemption from
the registration requirements of the Securities Act other than Rule 144, Rule
903 or Rule 904 and in compliance with the transfer restrictions contained in
the Indenture and any applicable blue sky securities laws of any State of the
United States and (ii) the restrictions on transfer contained in the Indenture
and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act.  Upon consummation of the proposed Transfer
in accordance with the terms of the Indenture, the transferred beneficial
interest or Definitive Note will not be subject to the restrictions on transfer
enumerated in the Private Placement Legend printed on the Restricted Global
Notes or Restricted Definitive Notes and in the Indenture.

          This certificate and the statements contained herein are made for your
benefit and the benefit of the Company.


                              _________________________________________________
                              [Insert Name of Transferor]

                              By:_______________________________________________
                                   Name:
                                   Title:

Dated:_______________,_________

                                      B-3
<PAGE>
 
                      ANNEX A TO CERTIFICATE OF TRANSFER

1.   The Transferor owns and proposes to transfer the following:

                           [CHECK ONE OF (a) OR (b)]

     (a)  [_]  a beneficial interest in the:

          (i)  [_] 144A Global Note (CUSIP _________), or

          (ii) [_] Regulation S Global Note (CUSIP _________), or

     (b)  [_]  a Restricted Definitive Note.

     2.   After the Transfer the Transferee will hold:

                                  [CHECK ONE]

          (a)  [_]   a beneficial interest in the:

               (i)   [_]  144A Global Note (CUSIP ________), or

               (ii)  [_]  Regulation S Global Note (CUSIP ________), or

               (iii) [_]  Unrestricted Global Note (CUSIP ________); or

          (b)  [_]   a Restricted Definitive Note; or

          (c)  [_]   an Unrestricted Definitive Note,

       in accordance with the terms of the Indenture.

                                      B-4
<PAGE>
 
                                   EXHIBIT C
                        FORM OF CERTIFICATE OF EXCHANGE


Crown Castle International Corp.
510 Bering Drive, Suite 500
Houston, TX  77057

[Registrar address block]

       Re:     % Senior Discount Notes due 2007
               --------------------------------

                             (CUSIP______________)


       Reference is hereby made to the Indenture, dated as of November __,
1997 (the "Indenture"), between Crown Castle International Corp., as issuer (the
           ---------                                                            
"Company"), and United States Trust Company of New York, as trustee.
- --------                                                             
Capitalized terms used but not defined herein shall have the meanings given to
them in the Indenture.

       ____________, (the "Owner") owns and proposes to exchange the Note[s] 
                              -----  
or interest in such Note[s] specified herein, in the principal amount of
$____________ in such Note[s] or interests (the "Exchange").  In connection with
                                                 --------                       
the Exchange, the Owner hereby certifies that:

1.   exchange of restricted definitive notes or beneficial interests in a
restricted global note for unrestricted definitive notes or beneficial interests
in an unrestricted global note

       (a) [_] check if exchange is from beneficial interest in a restricted
               -------------------------------------------------------------
global note to beneficial interest in an unrestricted global note. In connection
- -----------------------------------------------------------------
with the Exchange of the Owner's beneficial interest in a Restricted Global Note
for a beneficial interest in an Unrestricted Global Note in an equal principal
amount, the Owner hereby certifies (i) the beneficial interest is being acquired
for the Owner's own account without transfer, (ii) such Exchange has been
effected in compliance with the transfer restrictions applicable to the Global
Notes and pursuant to and in accordance with the United States Securities Act of
1933, as amended (the "Securities Act"), (iii) the restrictions on transfer
                       --------------                                      
contained in the Indenture and the Private Placement Legend are not required in
order to maintain compliance with the Securities Act and (iv) the beneficial
interest in an Unrestricted Global Note is being acquired in compliance with any
applicable blue sky securities laws of any state of the United States.

       (b) [_] check if exchange is from beneficial interest in a restricted
               -------------------------------------------------------------
global note to unrestricted definitive note. In connection with the Exchange of
- -------------------------------------------
the Owner's beneficial interest in a Restricted Global Note for an Unrestricted
Definitive Note, the Owner hereby certifies (i) the Definitive Note is being
acquired for the Owner's own account without transfer, (ii) such Exchange has
been effected in compliance with the transfer restrictions applicable to the
Restricted Global Notes and pursuant to and in accordance with the Securities
Act, (iii) the restrictions on transfer contained in the Indenture and the
Private Placement Legend are not required in order to maintain compliance with

                                      C-1
<PAGE>
 
the Securities Act and (iv) the Definitive Note is being acquired in compliance
with any applicable blue sky securities laws of any state of the United States.

       (c) [_] check if exchange is from restricted definitive note to
               -------------------------------------------------------
beneficial interest in an unrestricted global note. In connection with the
- --------------------------------------------------
Owner's Exchange of a Restricted Definitive Note for a beneficial interest in an
Unrestricted Global Note, the Owner hereby certifies (i) the beneficial interest
is being acquired for the Owner's own account without transfer, (ii) such
Exchange has been effected in compliance with the transfer restrictions
applicable to Restricted Definitive Notes and pursuant to and in accordance with
the Securities Act, (iii) the restrictions on transfer contained in the
Indenture and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act and (iv) the beneficial interest is being
acquired in compliance with any applicable blue sky securities laws of any state
of the United States.

       (d) [_] check if exchange is from restricted definitive note to
               -------------------------------------------------------
unrestricted definitive note. in connection with the Owner's Exchange of a
- ----------------------------
Restricted Definitive Note for an Unrestricted Definitive Note, the Owner hereby
certifies (i) the Unrestricted Definitive Note is being acquired for the Owner's
own account without transfer, (ii) such Exchange has been effected in compliance
with the transfer restrictions applicable to Restricted Definitive Notes and
pursuant to and in accordance with the Securities Act, (iii) the restrictions on
transfer contained in the Indenture and the Private Placement Legend are not
required in order to maintain compliance with the Securities Act and (iv) the
Unrestricted Definitive Note is being acquired in compliance with any applicable
blue sky securities laws of any state of the United States.

2.   exchange of restricted definitive notes or beneficial interests in
restricted global notes for restricted definitive notes or beneficial interests
in restricted global notes

       (a) [_] check if exchange is from beneficial interest in a restricted 
               -------------------------------------------------------------
global note to restricted definitive note.  In connection with the Exchange of
- -----------------------------------------
the Owner's beneficial interest in a Restricted Global Note for a Restricted
Definitive Note with an equal principal amount, the Owner hereby certifies that
the Restricted Definitive Note is being acquired for the Owner's own account
without transfer. Upon consummation of the proposed Exchange in accordance with
the terms of the Indenture, the Restricted Definitive Note issued will continue
to be subject to the restrictions on transfer enumerated in the Private
Placement Legend printed on the Restricted Definitive Note and in the Indenture
and the Securities Act.

       (b) [_] check if exchange is from restricted definitive note to
               -------------------------------------------------------
beneficial interest in a restricted global note. In connection with the Exchange
- -----------------------------------------------
of the Owner's Restricted Definitive Note for a beneficial interest in the
[CHECK ONE]- 144A Global Note, - Regulation S Global Note, with an equal
principal amount, the Owner hereby certifies (i) the beneficial interest is
being acquired for the Owner's own account without transfer and (ii) such
Exchange has been effected in compliance with the transfer restrictions
applicable to the Restricted Global Notes and pursuant to and in accordance with
the Securities Act, and in compliance with any applicable blue sky securities
laws of any state of the United States. Upon consummation of the proposed
Exchange in accordance with the terms of the Indenture, the beneficial interest
issued will be subject to the restrictions on transfer enumerated in the Private
Placement Legend printed on the relevant Restricted Global Note and in the
Indenture and the Securities Act.

                                      C-2
<PAGE>
 
               This certificate and the statements contained herein are made for
your benefit and the benefit of the Company.

                                        ________________________________________
                                                   [Insert Name of Owner]

                                        By: ____________________________________
                                             Name:
                                             Title:

Dated: ________________, ____

                                      C-3
<PAGE>
 
                                   EXHIBIT D
                         FORM OF NOTATION OF GUARANTEE


          For value received, each Guarantor (which term includes any successor
Person under the Indenture) has, jointly and severally, unconditionally
guaranteed, to the extent set forth in the Indenture and subject to the
provisions in the Indenture dated as of ________, 1997 (the "Indenture") among
CASTLE TOWER INTERNATIONAL CORP., the Guarantors listed on Schedule I thereto
and UNITED STATES TRUST COMPANY OF NEW YORK, as trustee (the "Trustee"), (a) the
due and punctual payment of the principal of, premium, if any, and interest on
the Notes (as defined in the Indenture), whether at maturity, by acceleration,
redemption or otherwise, the due and punctual payment of interest on overdue
principal and premium, and, to the extent permitted by law, interest, and the
due and punctual performance of all other obligations of the Company to the
Holders or the Trustee all in accordance with the terms of the Indenture and (b)
in case of any extension of time of payment or renewal of any Notes or any of
such other obligations, that the same will be promptly paid in full when due or
performed in accordance with the terms of the extension or renewal, whether at
stated maturity, by acceleration or otherwise.  The obligations of the
Guarantors to the Holders of Notes and to the Trustee pursuant to the Note
Guarantee and the Indenture are expressly set forth in Article 10 of the
Indenture and reference is hereby made to the Indenture for the precise terms of
the Note Guarantee.  Each Holder of a Note, by accepting the same, (a) agrees to
and shall be bound by such provisions, (b) authorizes and directs the Trustee,
on behalf of such Holder, to take such action as may be necessary or appropriate
to effectuate the subordination as provided in the Indenture and (c) appoints
the Trustee attorney-in-fact of such Holder for such purpose; provided, however,
that the Indebtedness evidenced by this Note Guarantee shall cease to be so
subordinated and subject in right of payment upon any defeasance of this Note in
accordance with the provisions of the Indenture.

                                   [Name of Guarantor(s)]



                                   By: _________________________________________
                                       Name:
                                       Title:

                                      D-1
<PAGE>
 
                                   EXHIBIT E
                        FORM OF SUPPLEMENTAL INDENTURE
                   TO BE DELIVERED BY SUBSEQUENT GUARANTORS


          Supplemental Indenture (this "Supplemental Indenture"), dated as of
________________, among  __________________ (the "Guaranteeing Subsidiary"), a
subsidiary of CROWN CASTLE INTERNATIONAL CORP. (or its permitted successor), a
Delaware corporation (the "Company"), the Company, the other Guarantors (as
defined in the Indenture referred to herein) and UNITED STATES TRUST COMPANY OF
NEW YORK, as trustee under the Indenture referred to below (the "Trustee").

                              W I T N E S S E T H

          WHEREAS, the Company has heretofore executed and delivered to the
Trustee an indenture (the "Indenture"), dated as of November __, 1997 providing
for the issuance of an aggregate principal amount of up to $____________ of ___%
Senior Discount Notes due 2007 (the "Notes");

          WHEREAS, the Indenture provides that under certain circumstances the
Guaranteeing Subsidiary shall execute and deliver to the Trustee a supplemental
indenture pursuant to which the Guaranteeing Subsidiary shall unconditionally
guarantee all of the Company's Obligations under the Notes and the Indenture on
the terms and conditions set forth herein (the "Note Guarantee"); and

          WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is
authorized to execute and deliver this Supplemental Indenture.

          NOW THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt of which is hereby acknowledged, the
Guaranteeing Subsidiary and the Trustee mutually covenant and agree for the
equal and ratable benefit of the Holders of the Notes as follows:

          1.  CAPITALIZED TERMS.  Capitalized terms used herein without
definition shall have the meanings assigned to them in the Indenture.

          2.  AGREEMENT TO GUARANTEE.  The Guaranteeing Subsidiary hereby agrees
as follows:

          (a) Along with all Guarantors named in the Indenture, to jointly and
              severally Guarantee to each Holder of a Note authenticated and
              delivered by the Trustee and to the Trustee and its successors and
              assigns, irrespective of the validity and enforceability of the
              Indenture, the Notes or the obligations of the Company hereunder
              or thereunder, that:

              (i)    the principal of and interest on the Notes will be
                     promptly paid in full when due, whether at maturity, by
                     acceleration, redemption or otherwise, and interest on the
                     overdue principal of and interest on the Notes, if any, if
                     lawful, and all other obligations of the Company to the
                     Holders or the Trustee hereunder or thereunder will be
                     promptly paid

                                      E-1
<PAGE>
 
                      in full or performed, all in accordance with the terms
                      hereof and thereof; and

               (ii)   in case of any extension of time of payment or renewal of
                      any Notes or any of such other obligations, that same will
                      be promptly paid in full when due or performed in
                      accordance with the terms of the extension or renewal,
                      whether at stated maturity, by acceleration or otherwise.
                      Failing payment when due of any amount so guaranteed or
                      any performance so guaranteed for whatever reason, the
                      Guarantors shall be jointly and severally obligated to pay
                      the same immediately.

          (b)  The obligations hereunder shall be unconditional, irrespective of
               the validity, regularity or enforceability of the Notes or the
               Indenture, the absence of any action to enforce the same, any
               waiver or consent by any Holder of the Notes with respect to any
               provisions hereof or thereof, the recovery of any judgment
               against the Company, any action to enforce the same or any other
               circumstance which might otherwise constitute a legal or
               equitable discharge or defense of a guarantor.

          (c)  The following is hereby waived: diligence, presentment, demand of
               payment, filing of claims with a court in the event of insolvency
               or bankruptcy of the Company, any right to require a proceeding
               first against the Company, protest, notice and all demands
               whatsoever.

          (d)  This Note Guarantee shall not be discharged except by complete
               performance of the obligations contained in the Notes and the
               Indenture.

          (e)  If any Holder or the Trustee is required by any court or
               otherwise to return to the Company, the Guarantors, or any
               Custodian, Trustee, liquidator or other similar official acting
               in relation to either the Company or the Guarantors, any amount
               paid by either to the Trustee or such Holder, this Note
               Guarantee, to the extent theretofore discharged, shall be
               reinstated in full force and effect.

          (f)  The Guaranteeing Subsidiary shall not be entitled to any right of
               subrogation in relation to the Holders in respect of any
               obligations guaranteed hereby until payment in full of all
               obligations guaranteed hereby.

          (g)  As between the Guarantors, on the one hand, and the Holders and
               the Trustee, on the other hand, (x) the maturity of the
               obligations guaranteed hereby may be accelerated as provided in
               Article 6 of the Indenture for the purposes of this Note
               Guarantee, notwithstanding any stay, injunction or other
               prohibition preventing such acceleration in respect of the
               obligations guaranteed hereby, and (y) in the event of any
               declaration of acceleration of such obligations as provided in
               Article 6 of the Indenture, such obligations (whether or not due
               and payable) shall forthwith become due and payable by the
               Guarantors for the purpose of this Note Guarantee.

                                      E-2
<PAGE>
 
          (h)  The Guarantors shall have the right to seek contribution from any
               non-paying Guarantor so long as the exercise of such right does
               not impair the rights of the Holders under the Guarantee.

          (i)  Pursuant to Section 10.02 of the Indenture, after giving effect
               to any maximum amount and any other contingent and fixed
               liabilities that are relevant under any applicable Bankruptcy or
               fraudulent conveyance laws, and after giving effect to any
               collections from, rights to receive contribution from or payments
               made by or on behalf of any other Guarantor in respect of the
               obligations of such other Guarantor under Article 10 of the
               Indenture shall result in the obligations of such Guarantor under
               its Note Guarantee not constituting a fraudulent transfer or
               conveyance.

          3    EXECUTION AND DELIVERY.  Each Guaranteeing Subsidiary agrees that
the Note Guarantees shall remain in full force and effect notwithstanding any
failure to endorse on each Note a notation of such Note Guarantee.

          4.   Guaranteeing Subsidiary May Consolidate, Etc. on Certain Terms.

     (a)  The Guaranteeing Subsidiary may not consolidate with or merge with or
          into (whether or not such Guarantor is the surviving Person) another
          corporation, Person or entity whether or not affiliated with such
          Guarantor unless:

          (i)  subject to Section 10.05 of the Indenture, the Person formed by
               or surviving any such consolidation or merger (if other than a
               Guarantor or the Company) unconditionally assumes all the
               obligations of such Guarantor, pursuant to a supplemental
               indenture in form and substance reasonably satisfactory to the
               Trustee, under the Notes, the Indenture and the Note Guarantee on
               the terms set forth herein or therein; and

          (ii) immediately after giving effect to such transaction, no Default
               or Event of Default exists.

     (b)  In case of any such consolidation, merger, sale or conveyance and upon
          the assumption by the successor corporation, by supplemental
          indenture, executed and delivered to the Trustee and satisfactory in
          form to the Trustee, of the Note Guarantee endorsed upon the Notes and
          the due and punctual performance of all of the covenants and
          conditions of the Indenture to be performed by the Guarantor, such
          successor corporation shall succeed to and be substituted for the
          Guarantor with the same effect as if it had been named herein as a
          Guarantor.  Such successor corporation thereupon may cause to be
          signed any or all of the Note Guarantees to be endorsed upon all of
          the Notes issuable hereunder which theretofore shall not have been
          signed by the Company and delivered to the Trustee.  All the Note
          Guarantees so issued shall in all respects have the same legal rank
          and benefit under the Indenture as the Note Guarantees theretofore and
          thereafter issued in accordance with the terms of the Indenture as
          though all of such Note Guarantees had been issued at the date of the
          execution hereof.

                                      E-3
<PAGE>
 
     (c)  Except as set forth in Articles 4 and 5 of the Indenture, and
          notwithstanding clauses (a) and (b) above, nothing contained in the
          Indenture or in any of the Notes shall prevent any consolidation or
          merger of a Guarantor with or into the Company or another Guarantor,
          or shall prevent any sale or conveyance of the property of a Guarantor
          as an entirety or substantially as an entirety to the Company or
          another Guarantor.

               5.   RELEASES.

     (a)  In the event of a sale or other disposition of all of the assets of
          any Guarantor, by way of merger, consolidation or otherwise, or a sale
          or other disposition of all to the capital stock of any Guarantor,
          then such Guarantor (in the event of a sale or other disposition, by
          way of merger, consolidation or otherwise, of all of the capital stock
          of such Guarantor) or the corporation acquiring the property (in the
          event of a sale or other disposition of all or substantially all of
          the assets of such Guarantor) will be released and relieved of any
          obligations under its Note Guarantee; provided that the Net Proceeds
          of such sale or other disposition are applied in accordance with the
          applicable provisions of the Indenture, including without limitation
          Section 4.10 of the Indenture. Upon delivery by the Company to the
          Trustee of an Officers' Certificate and an Opinion of Counsel to the
          effect that such sale or other disposition was made by the Company in
          accordance with the provisions of the Indenture, including without
          limitation Section 4.10 of the Indenture, the Trustee shall execute
          any documents reasonably required in order to evidence the release of
          any Guarantor from its obligations under its Note Guarantee.

     (b)  Any Guarantor not released from its obligations under its Note
          Guarantee shall remain liable for the full amount of principal of and
          interest on the Notes and for the other obligations of any Guarantor
          under the Indenture as provided in Article 10 of the Indenture.

          6.   NO RECOURSE AGAINST OTHERS.  No past, present or future director,
officer, employee, incorporator, stockholder or agent of the Guaranteeing
Subsidiary, as such, shall have any liability for any obligations of the Company
or any Guaranteeing Subsidiary under the Notes, any Note Guarantees, the
Indenture or this Supplemental Indenture or for any claim based on, in respect
of, or by reason of, such obligations or their creation.  Each Holder of the
Notes by accepting a Note waives and releases all such liability.  The waiver
and release are part of the consideration for issuance of the Notes.  Such
waiver may not be effective to waive liabilities under the federal securities
laws and it is the view of the Commission that such a waiver is against public
policy.

          7.   NEW YORK LAW TO GOVERN.  THE INTERNAL LAW OF THE STATE OF NEW
YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE BUT
WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT
THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED
THEREBY.

          8.   COUNTERPARTS  The parties may sign any number of copies of this
Supplemental Indenture.  Each signed copy shall be an original, but all of them
together represent the same agreement.

                                      E-4
<PAGE>
 
          9.   EFFECT OF HEADINGS.  The Section headings herein are for
convenience only and shall not affect the construction hereof.

          10.  THE TRUSTEE.  The Trustee shall not be responsible in any manner
whatsoever for or in respect of the validity or sufficiency of this Supplemental
Indenture or for or in respect of the recitals contained herein, all of which
recitals are made solely by the Guaranteeing Subsidiary and the Company.

                                      E-5
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed and attested, all as of the date first above
written.

Dated:  _______________, ____

                                   [Guaranteeing Subsidiary]
     

                                   By: _________________________________________
                                        Name:
                                        Title:


                                   [COMPANY]


                                   By: _________________________________________
                                        Name:
                                        Title:


                                   [EXISTING GUARANTORS]


                                   By: _________________________________________
                                        Name:
                                        Title


                                   [TRUSTEE]
                                        as Trustee


                                   By: _________________________________________
                                        Name:
                                        Title:

                                      E-6

<PAGE>
                                                                     EXHIBIT 4.2

                  AMENDED AND RESTATED STOCKHOLDERS AGREEMENT

          THIS AMENDED AND RESTATED STOCKHOLDERS AGREEMENT, made as of the 15th
day of August, 1997, by and among Castle Tower Holding Corp., a Delaware
corporation (the "Company"), Edward C. Hutcheson, Jr., Ted B. Miller, Jr.,
                  -------
Robert A. Crown and Barbara Crown (collectively, the "Stockholders" and each 
                                                      ------------      
individually, a "Stockholder") and the persons listed on Schedule I hereto
                 -----------
(collectively, the "Investors" and individually an "Investor").
                    ---------                       --------

          WHEREAS Robert A. Crown and Barbara Crown (collectively, the "Crowns"
                                                                        ------
are acquiring an aggregate of 1,465,000 shares of Class B Common Stock, $0.01
par value, of the Company (the "Class B Stock") pursuant to the terms and 
                                -------------
conditions of a First Amended and Restated Asset Purchase and Merger Agreement
dated as of July 11, 1997, as amended and restated on August 14, 1997, among the
Company, the Stockholders and the other parties thereto (the "Crown Purchase
                                                              --------------
Agreement");
- ---------

          WHEREAS certain Investors are acquiring an aggregate of 292,995 shares
of Senior Convertible Preferred Stock, $0.01 par value, of the Company (the
"Senior Preferred Stock") and Warrants of the Company pursuant to the terms and
 ----------------------
conditions of the Securities Purchase Agreement dated as of August 13, 1997
between the Company and such Investors (the "Senior Preferred Agreement");
                                             --------------------------

          WHEREAS the Company has imposed certain restrictions and obligations
or the transfer or disposition of any stock of the Company held by the Crowns
and desires to evidence such restrictions and obligations in writing;

          WHEREAS to effect the foregoing, the Company, the Stockholders and
the Investors desire to amend and restate that certain Stockholders Agreement
dated as of February 24, 1997 (the "Stockholders Agreement"), between the
                                    ----------------------
Company, Edward C. Hutcheson, Jr. and Ted B. Miller, Jr. (Edward C. Hutcheson,
Jr. and Ted B. Miller, Jr., collectively, the "Initial Stockholders") as
                                               --------------------
stockholders and the Investors party thereto; and

          WHEREAS it is a condition to the obligations of the parties under the
Crown Purchase Agreement and the Senior Preferred Agreement that this Agreement
be executed by the parties hereto, and the parties are willing to execute this
Agreement and to be bound by the provisions hereof

          NOW THEREFORE, the Company, the Stockholders and the Investors, for
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, agree as follows:

                                   ARTICLE I

                                  Definitions
                                  -----------

          SECTION 1.01. Certain Defined Terms.  As used in this Agreement,
                        ---------------------                           
capitalized terms shall have the meanings assigned to such terms as set forth
below:
<PAGE>
 
                                                                               2



          "Affiliate" of an entity shall mean (a) any entity which controls, is 
           ---------
controlled by or is under common control with such entity, or any general or
limited partner of such entity or (b) any general or limited partner of any
entity. In addition, (i) each of Centennial Fund IV, L.P. ("Centennial IV"), 
                                                            -------------
Centennial Fund V, L.P. ("Centennial V") and Centennial Entrepreneurs Fund V,
                          ------------
L.P. shall be deemed an Affiliate of the other, (ii) each of Berkshire Fund III
Investment Corp. ("Berkshire III Corp."), Berkshire Fund III, a Limited
                   -------------------
Partnership ("Berkshire III"), Berkshire Fund IV Investment Corp. ("Berkshire IV
              -------------                                         ------------
Corp."), Berkshire Fund IV, a Limited Partnership ("Berkshire IV") and Berkshire
- -----                                               ------------
Investors LLC shall be deemed an Affiliate of the other and (iii) each of Nassau
Capital Partners II L.P. ("Nassau Capital II") and NAS Partners I L.L.C. ("NAS
                           -----------------                               ---
I") shall be deemed an Affiliate of the other.
- -

          "Appraiser" shall have the meaning set forth in Section 2.07(a)(iv).
           ---------

          "Berkshire Group" shall have the meaning set forth in Section
           ---------------
2.04(a)(ii).

          "Board" shall mean the Board of Directors of the Company.
           -----

          "By-laws" shall mean the bylaws of the Company as amended.
           -------

          "Call Event" shall have the meaning set forth in Section 2.07(b).
           ----------

          "Call Group" shall have the meaning set forth in Section 2.07(b).
           ----------

          "Call Notice" shall have the meaning set forth in Section 2.07(b).
           -----------

          "Call Option" shall have the meaning set forth in Section 2.07(b).
           -----------

          "Call Option Closing" shall have the meaning set forth in Section
           -------------------
2.07(f)(i). 

          "Call Period" shall have the meaning set forth in Section 2.07(b).
           -----------

          "Call Price" shall have the meaning set forth in Section 2.07(e).
           ----------

          "Call Securities" shall have the meaning set forth in Section 2.07(b).
           ---------------

          "Cause" shall have the meaning set forth in Section 2.07(a)(ii).
           -----

          "Charter" shall mean the certificate of incorporation of the Company 
           -------
as amended.

          "Class A Stock" mean the Company's Class A Common Stock $.01 par value
           -------------
per share.

          "Class B Stock" shall have the meaning set forth in the Recitals.
           -------------

          "Commission" shall mean the Securities and Exchange Commission, or any
           ----------
other Federal agency at the time administering the Securities Act.

          "Common Conversion Shares" shall mean the shares of Common Stock 
           ------------------------
issuable upon the conversion of the Preferred Stock.
<PAGE>
 
                                                                               3

          "Common Stock" includes (a) the Class A Stock as authorized on the
           ------------                                                     
date of this Agreement, (b) the Class B Stock, (c) any other capital stock of
any class or classes (however designated) of the Company, authorized on or after
the date hereof, the holders of which shall have the right, without limitation
as to amount, either to all or to a share of the balance of current dividends
and liquidating dividends after the payment of dividends and distributions on
any shares entitled to preference, and the holders of which shall ordinarily, in
the absence of contingencies, be entitled to vote for the election of a majority
of directors of the Company (even though the right so to vote has been suspended
by the happening of such a contingency), and (d) any other securities into which
or for which any of the securities described in (a), (b) or (c) may be converted
or exchanged pursuant to a plan of recapitalization, reorganization, merger,
sale of assets or otherwise.

          "Company" shall have the meaning set forth in the Preamble.
           -------                                                   

          "Company Notice" shall have the meaning set forth in Section 2.02(e).
           --------------                                             
          
          "Crown Nominee" shall have the meaning set forth in Section 3.01(a).
           -------------                                                      

          "Crown Purchase Agreement" shall have the meaning set forth in the
           ------------------------                                         
Recitals.

          "Crown Related Transferees" shall have the meaning set forth in 
           -------------------------                                     
Section 3.01(a).

          "Crowns" shall have the meaning set forth in the Recitals.
           ------                                                   

          "Current Liabilities" means all liabilities of any corporation which
           -------------------                                                
would, in accordance with generally accepted accounting principles consistently
applied, be classified as current liabilities of a corporation conducting a
business the same as or similar to that of such corporation, including, without
limitation, all rental payments due under leases required to be capitalized in
accordance with applicable Statements of Financial Accounting Standards and
fixed prepayments of, and sinking fund payments with respect to, Indebtedness,
which payments are required to be made within one year from the date of
determination.

          "Disability" shall have the meaning set forth in Section 2.07(iii).
           ----------                                                        

          "Distributions" shall have the meaning set forth in Section 5.18(g).
           -------------                                                      

          "Exchange Act" shall mean the Securities Exchange Act of 1934, as
           ------------                                                    
amended, or any similar Federal statute, and the rules and regulations of the
Commission thereunder, all as the same shall be in effect at the time.

          "Fair Market Value" shall have the meaning set forth in Section 
           -----------------                                             
2.07(a)(iv).          

          "Ford Foundation Letter" shall mean that certain letter regarding
           ----------------------                                          
direct or indirect holdings of certain persons affiliated with the Ford
Foundation.

          "General Director" and "General Directors shall have the meaning set
           ----------------       -----------------                        
forth in Section 3.02.
<PAGE>
 
                                                                               4

          "Indebtedness" means all obligations, contingent and otherwise, which 
           ------------
should, in accordance with generally accepted accounting principles consistently
applied, be classified upon the obligor's balance sheet as liabilities, but in 
any event including, without limitation, liabilities secured by any mortgage on 
property owned or acquired subject to such mortgage, whether or not the
liability secured thereby shall have been assumed, and also including, without
limitation, (i) all guaranties, endorsements and other contingent obligations,
in respect of Indebtedness of others, whether or not the same are or should be 
so reflected in said balance sheet, except guaranties by endorsement of 
negotiable instruments for deposit or collection or similar transactions in the 
ordinary course of business and (ii) the present value of any lease payments due
under leases required to be capitalized in accordance with applicable Statements
of Financial Accounting Standards, determined in accordance with applicable 
Statements of Financial Accounting Standards.

          "Initial General Directors" shall have the meaning set forth in 
           -------------------------
Section 3.01(a)(i).

          "Initial Stockholders" shall have the meaning set forth in the 
           --------------------
Recitals.

          "Initial Shareholder" shall have the meaning set forth in Section
           -------------------
2.05(b).

          "Investment Parties" shall have the meaning set forth in Section
           ------------------
2.03(a).   

          "Investment Party" shall have the meaning set forth in Section
           ----------------
2.03(a).

          "Investment Price" shall have the meaning set forth in Section
           ----------------
2.07(a)(v).

          "Investor" shall have the meaning set forth in the Preamble.
           --------

          "Investor Notice" shall have the meaning set forth in Section
           ---------------
2.03(e).   

          "Investor Offeree" shall have the meaning set forth in Section
           ----------------
2.04(b)(ii).

          "Investor Offerees" shall have the meaning set forth in Section
           -----------------
2.04(b)(ii).

          "Investors" shall have the meaning set forth in the Preamble.
           ---------

          "Nassau" shall have the meaning set forth in Section 3.01(b).
           ------

          "Nominating Group" shall have the meaning set forth in Section
           ----------------
3.01(a).

          "Nominating Investor" shall have the meaning set forth in Section
           -------------------
3.01(b).

          "Nominating Investors" shall have the meaning set forth in Section
           --------------------
3.01(b).     
               
          "Note" shall mean the promissory note issued by the Company to Robert 
           ----
A. Crown and Barbara A. Crown pursuant to the Crown Purchase Agreement and any 
Indebtedness incurred to refinance such note.

          "Offer" shall have the meaning set forth in Section 2.02(a).
           -----
<PAGE>
 
                                                                               5

          "Offered Investor Shares" shall have the meaning set forth in Section
           -----------------------                                     
2.04(b)(i).

          "Offered Shares" shall have the meaning set forth in Section 2.02(a).
           --------------

          "Offerees" shall have the meaning set forth in Sections 2.02(a) and
           --------                                                          
2.03(a), as applicable.

          "Offer Price" shall have the meaning set forth in Section 2.04(b)(i). 
           -----------                                             

          "Option Period" shall have the meaning set forth in Section 
           -------------                            
2.04(b)(ii). 

          "Participating Offeree" shall have the meaning set forth in Section 
           ---------------------       
2.05(b).
                                                                   
          "Participating Offerees" shall have the meaning set forth in Section 
           -----------------------                                  
2.05(b). 

          "Participation Notice" shall have the meaning set forth in Section 
           --------------------                
2.05(b).

          "Participation Securities" shall have the meaning set forth in
           ------------------------                                     
Section 2.05(b).

          "Permitted Transfer" shall have the meaning set forth in Section 
           ------------------
2.04(a).                     

          "Permitted Transferee" shall have the meaning set forth in Section 
           --------------------                                     
2.04(a).

          "person" means an individual, corporation, limited liability company,
           ------                                           
partnership, joint venture, trust or unincorporated organization, or a
government or any agency or political subdivision thereof

          "Preferred Nominee" shall have the meaning set forth in Section 
           -----------------                                     
3.01(b).

          "Preferred Nominees" shall have the meaning set forth in Section 
           ------------------                                     
3.01(b).

          "Preferred Shares" or "Preferred Stock" shall mean and include all
           ----------------      ---------------                            
shares of Series A Convertible Preferred Stock ("Series A Stock"), Series B
                                                 --------------
Convertible Preferred Stock ("Series B Stock"), Series C Convertible Preferred
                              --------------          
Stock ("Series C Stock") and Senior Preferred Stock now owned or hereafter
        --------------
acquired by any Investor.

          "Pro Rata Call Fraction" shall have the meaning set forth in Section 
           ----------------------                                  
2.07(c).

          "Pro Rata Fraction" shall have the meaning set forth in Sections 
           -----------------                                     
2.02(b) and 2.03(b), as applicable.

          "Purchaser" and "Purchasers" shall have the meanings set forth in
           ---------       ----------
Article V.

          "Put Acceptance Notice" shall have the meaning set forth in Section 
           ---------------------                                     
2.08(a).

          "Put Event" shall have the meaning set forth in Section 2.08(a).
           ---------
<PAGE>
 
                                                                               6

          "Put Notice" shall have the meaning set forth in Section 2.08(a).
           ----------                                                      

          "Put Option" shall have the meaning set forth in Section 2.08(a). 
           ----------                                             

          "Put Option Closing" shall have the meaning set forth in Section
           ------------------                            
2.08(c). 

          "Put Price" shall have the meaning set forth in Section 2.08(b).
           ---------

          "Put Securities" shall have the meaning set forth in Section 2.08(a).
           --------------

          "Qualified Public Offering" shall have the meaning set forth in
           -------------------------                                     
Section 2.02(h)(iii)(A).

          "Registration Expenses" shall mean the expenses so described in 
           ---------------------                            
Section 6.07.

          "Related Transferees" shall have the meaning set forth in Section
           -------------------                                             
2.08(a)

          "Remaining Shares" shall have the meaning set forth in Section 
           ----------------                                             
2.02(e).          

          "Remaining Stockholder" shall have the meaning set forth in Section 
           ---------------------                                     
2.03(a).

          "Restricted Stock" means (a) all of the Common Conversion Shares owned
           ----------------                                               
by the Purchasers, (b) all other shares of Common Stock now owned or hereafter
acquired by any Purchaser, (c) all shares of Common Stock issuable with respect
to securities of the Company convertible into or exercisable for shares of
Common Stock now owned or hereafter acquired by any Purchaser and (d) any Common
Stock issued in respect of the shares described in clauses (a) through (c) upon
any stock dividend, recapitalization or other similar event but, in each case,
excluding any Common Conversion Shares or shares of Common Stock which have been
(i) registered under the Securities Act pursuant to an effective registration
statement filed thereunder and disposed of in accordance with the registration
statement covering them or (ii) publicly sold pursuant to Rule 144 under the
Securities Act.

          "Sale Request" shall have the meaning set forth in Section 2.06.
           ------------                                             

          "Securities Act" shall mean the Securities Act of 1933, or any similar
           --------------                                               
Federal statute, and the rules and regulations of the Commission thereunder, all
as the same shall be in effect at the time.

          "Securities Purchase Agreements" shall mean the Securities Purchase
           ------------------------------                                     
Agreement dated July 15, 1996, relating to the purchase of the Series B Stock
and the Securities Purchase Agreement dated February 14, 1997, relating to the
purchase of the Series C Stock.

          "Selling Expenses" shall mean the expenses so described in Section
           ----------------                                                 
6.07.

          "Senior Debt" shall mean (a) all Indebtedness of the Company for money
           -----------                                                    
borrowed from banks or other institutional lenders, including any extensions or
renewals thereof, whether outstanding on the date hereof or thereafter created
or incurred, which is
<PAGE>
 
                                                                               7

not by its terms subordinate and junior to or on a parity with the Note and (b)
all guaranties by the Company which are not by their terms subordinate and
junior to or on a parity with the Note and (c) Indebtedness of any Subsidiary if
such Indebtedness would have been Senior Debt pursuant to the provisions of
clause (a) or (b) of this sentence had it been Indebtedness of the Company.

          "Senior Preferred Agreement" shall have the meaning set forth in the
           --------------------------                                        
recitals.

          "Senior Preferred Stock" shall have the meaning set forth in the
           ----------------------
recitals.

          "Shares" shall mean and include all shares of Common Stock now owned
           ------                                                   
or hereafter acquired by either (i) any Stockholder or (ii) any Investor,
including any shares of Common Stock issuable upon conversion of outstanding
Preferred Shares. 

          "Stockholder" and "Stockholders" shall have the meanings set forth in
           -----------       ------------                                   
the Preamble.

          "Stockholders Agreement" shall have the meaning set forth in the
           ---------------------
Recitals.

          "Subsidiary" or "Subsidiaries" when used with respect to any person
           ----------      ------------                                      
means any other person, whether incorporated or unincorporated, of which at
least a majority of the securities or other interests having by their terms
ordinary voting power to elect at least a majority of the board of directors or
others performing similar functions with respect to such corporation or other
organization is directly or indirectly owned or controlled by such person or by
any one or more of its Subsidiaries.

          "Take Along Group" shall have the meaning set forth in Section 2.06.
           ---------------                                                   

          "Transfer Notice" shall have the meaning set forth in Section
           ---------------                                      
2.04(b)(i).

          "U.S. Real Property Holding Company" shall have the meaning set forth 
           ----------------------------------                      
in Section 5.14(a).

          "U.S. Real Property Interest" shall have the meaning set forth in
           ---------------------------                                     
Section 5.14(b).

                                  ARTICLE II

                                Transfer Rights
                                ---------------

          SECTION 2.01. Prohibited Transfers. Neither of the Crowns so long as
                        --------------------                                
either of the Crowns is employed by the Company or any of its Subsidiaries or
Affiliates) nor any Initial Stockholder shall sell, assign, transfer, pledge,
hypothecate, mortgage, encumber or otherwise dispose of all or any of his or her
Shares except to the Company or as expressly provided in this Agreement.
Notwithstanding the foregoing, a Stockholder may transfer all or any of his or
her Shares (a) in the case of the Initial Stockholders, to any other Initial
Stockholder, (b) by way of gift or other disposition to any member of his or her
family or to any trust for the benefit of, or any corporation, limited
partnership, limited liability company or other entity 100% beneficially owned
by, any such family
<PAGE>
 
                                                                               8

member or members and/or the Stockholder; provided that any such transferee 
                                          --------
shall agree in writing with the Company and the Investors, as a condition to 
such transfer, to be bound by all of the provisions of this Agreement to the 
same extent as if such transferee were a Stockholder; provided further that the 
                                                      -------- -------
transferor shall retain all rights to vote such Shares for all purposes, by 
means of an irrevocable proxy or otherwise, (c) by will or the laws of descent 
and distribution, in which event each such transferee shall be bound by all of 
the provisions of this Agreement to the same extent as if such transferee were a
Stockholder, (d) to employees of the Company pursuant to terms and conditions 
approved by the Board or (e) as permitted or required pursuant to the terms of 
Section 2.02, 2.03, 2.05 and 2.06 hereof. As used herein, the word "family" 
shall include any spouse, lineal ancestor or descendant, brother or sister.

          SECTION 2.02. Right of First Refusal on Disposition by the Crowns. (a)
                        ---------------------------------------------------
If, at any time while either of the Crowns is employed by the Company or any of 
its Subsidiaries or Affiliates, the Crowns desire to sell for cash all or part 
of their Shares pursuant to a bona fide offer from a third party (the "Proposed 
                                                                       --------
Transferee"), the Investors and the Company, in that order, shall have the right
- ----------
to purchase (in the aggregate) all, but not less than all, of the Shares 
proposed to be sold by the Crowns. Upon receipt of a bona fide offer from a 
Proposed Transferee for the purchase of the Shares, the Crowns shall submit a 
written offer (the "Offer") to sell such Shares (the "Offered Shares") to the 
                    -----                             --------------
Investors and the Company (for purposes of this Section 2.02, the "Offerees") 
                                                                   --------
(subject, in the case of the Company, to the purchase of Offered Shares by the 
Investors) on the terms and conditions, including price, not less favorable than
those on which the Crowns propose to sell such Offered Shares to the Proposed 
Transferee. The Offer shall disclose the identity of the Proposed Transferee, 
the Offered Shares proposed to be sold, the total number of Shares owned by the 
Crowns, the terms and conditions, including price, of the proposed sale, and any
other material facts relating to the proposed sale. The Offer shall further 
state that the Offerees may acquire, in accordance with the provisions of this 
Agreement, all of the Offered Shares for the price and upon the other terms and 
conditions, including deferred payment (if applicable), set forth therein.

          (b)  Each Investor shall have the absolute right to purchase that 
number of Offered Shares as shall be equal to the number of such Offered Shares 
multiplied by a fraction, the numerator of which shall be the number of Shares 
then owned by such Investor and the denominator of which shall be the aggregate 
number of Shares then owned by all of the Investors. For purposes of this 
Section 2.02, all of the Common Stock which an Investor has the right to acquire
from the Company upon the conversion, exercise or exchange of any of the 
securities of the Company then owned by such Investor shall be deemed to be 
Shares then owned by such Investor. The amount of Offered Shares each Investor 
is entitled to purchase under this Section 2.02 shall be referred to as its "Pro
                                                                             ---
Rata Fraction".
- -------------

          (c)  The Investor shall have a right of oversubscription such if any 
Investor fails to accept the Offer as to its Pro Rata Fraction, the Investors 
shall among them have the right to purchase up to the balance of the Offered 
Shares not so purchased. Such right of oversubscription may be exercised by an 
Investor by accepting the Offer as to more than its Pro Rata Fraction. If, as a 
result thereof, such oversubscriptions exceed the total number of Offered Shares
available in respect of such oversubscription privilege, the oversubscribing 
Investors shall be cut back with respect to their oversubscriptions on a pro 
rata basis in accordance with their respective Pro Rata Fractions or as they may
otherwise agree among themselves.
<PAGE>
 
                                                                               9

          (d)  If any Investor desires to purchase all or any part of the
Offered Shares, the Investor shall communicate in writing its election to
purchase to the Crowns, which communication shall state the number of Offered
Shares the Investor desires to purchase, and shall be given to the Crowns in
accordance with Section 7.05 below within 30 days of the date of the Offer.

          (e)  If the Investors do not purchase all of the Offered Shares, then
the Crowns shall send written notice to the Company indicating the number of
Offered Shares available for purchase (the "Remaining Shares") pursuant to the
                                            -----------------                 
terms and conditions, including price, set forth in the Offer (the "Company
                                                                    -------
Notice"). The Company shall communicate in writing its election to purchase all
- ------                                                                   
of such Remaining Shares, which communication shall be given to the Crowns in
accordance with Section 7.05 below within 30 days of receipt of the Company
Notice.

          (f)  If the Investors and/or the Company elect to purchase, in the
aggregate, all of the Offered Shares, any written communication of an election
to so purchase delivered by any Investor or the Company shall, when taken in
conjunction with the Offer, be deemed to constitute a valid, legally binding and
enforceable agreement for the sale and purchase of the stated Offered Shares.
Sales of the stated Shares to be sold to any Investor and/or the Company
pursuant to this Section 2.02 shall be made at the offices of the Company on the
45th day following the later of the date (i) of the Offer, if the Investors
elect to purchase all of the Offered Shares, or (ii) of the Company Notice, if
the Company and/or the Investors elect to purchase all of the Offered Shares (or
if such 45th day is not a business day, then on the next succeeding business
day). Such sales shall be effected by the Crowns' delivery to the Company of a
certificate or certificates evidencing the Offered Shares to be purchased by the
Investors and/or the Company, duly endorsed for transfer to the Company, against
payment to the Crowns of the purchase price therefor by the party purchasing
such Offered Shares.

          (g)  If the Investors and/or the Company do not purchase all of the
Offered Shares, then, subject to Section 2.05 hereof, all, but not less than
all, of the Offered Shares may be sold by the Crowns at any time within 180 days
after the date the Offer was made. Any such sale shall be to the Proposed
Transferee, at not less than the price and upon other terms and conditions, if
any, not more favorable to the Proposed Transferee than those specified in the
Offer. If the Offered Shares are not sold within such 180-day period, such
Shares shall continue to be subject to the requirements of a prior offer
pursuant to this Section 2.02. If Offered Shares are sold pursuant to this
Section 2.02 to any purchaser who is not a party to this Agreement, the Offered
Shares so sold shall no longer be subject to this Agreement.

          (h)  The rights of first refusal provided in this Section 2.02 shall
not apply with respect to (i) sales of Shares to the Company. (ii) sales of
Shares to the other Stockholders or (iii) sales of Shares in the Company's
initial firm commitment public offering of Common Stock in which (A) the
aggregate net proceeds to the Company after deducting underwriters' commissions
and discounts shall be at least $30,000,000 (a "Qualified Public Offering") and
                                                -------------------------     
(B) the price paid by the public for such shares of Common Stock shall be at
least $100 per share, which amount shall be adjusted to reflect any stock split,
stock dividend, combination, reclassification or reorganization in respect of
the Common Stock.
<PAGE>
 
                                                                              10

          SECTION 2.03. Right of Refusal on Dispositions by Initial
                        -------------------------------------------
Stockholders. (a) If at any time an Initial Stockholder desires to sell for cash
- ------------
all or any part of his Shares pursuant to a bona fide offer from a Proposed
Transferee, the other Initial Stockholder, if he is employed by the Company at
the time of such proposed transfer (the "Remaining Stockholder"), the Investors
                                         ---------------------       
and the Crowns as a group (the Investors, together with the Crowns, each an
"Investment Party" and collectively, the "Investment Parties") and the Company
 ----------------                         ------------------
in that order, shall have the right to purchase (in the aggregate) all, but not
less than all, of the Shares proposed to be sold by the Initial Stockholder.
Upon receipt of a bona fide offer from a Proposed Transferee for the purchase of
Shares, the Initial Stockholder shall submit an Offer to sell the Offered Shares
to the Remaining Stockholder, to the Investment Parties and to the Company (for
purposes of this section 2.03, the "Offerees") (subject, in the case of the
                                    --------
Investment Parties, to the purchase of Offered Shares by the Remaining
Stockholder and, in the case of the Company, to the purchase of Offered Shares
by the Remaining Stockholder and the Investment Patties) on terms and
conditions, including price, not less favorable than those on which the Initial
Stockholder proposes to sell such Offered Shares to the Proposed Transferee. The
Offer shall disclose the identity of the Proposed Transferee, the Offered Shares
proposed to be sold, the total number of Shares owned by the Initial
Stockholder, the terms and conditions, including price, of the proposed sale,
and any other material facts relating to the proposed sale. The Offer shall
further state that the Offerees may acquire, in accordance with the provisions
of this Agreement, all of the Offered Shares for the price and upon the other
terms and conditions, including deferred payment (if applicable), set forth
therein.

          (b)  If the Remaining Stockholder does not purchase all of the Offered
Shares, then each Investment Party shall have the absolute right to purchase
that number of remaining Offered Shares as shall be equal to the number of such
Offered Shares multiplied by a fraction, the numerator of which shall be number
of Shares then owned by such Investment Party and the denominator of which shall
be the aggregate number of Shares then owned by all of the Investment Parties.
For purposes of Section 2.03, all of the Common Stock which an Investment Party
has the right to acquire from the Company upon the conversion, exercise or
exchange of any of the securities of the Company then owned by such Investment
Party shall be deemed to be Shares then owned by such investment Party. The
amount of Offered Shares that each Investment Party is entitled to purchase
under this Section 2.03(b) shall be referred to as its "Pro Rata Fraction".
                                                        ----------------- 

          (c)  The Investment Parties shall have a right of oversubscription
such that if any Investment Party fails to accept the Offer as to its Pro Rata
Fraction, the other Investment Parties shall among them have the right to
purchase up to the balance of the Offered Shares not so purchased. Such right of
oversubscription may be exercised by an investment Party by accepting the Offer
as to more than its Pro Rata Fraction. If, as a result thereof, such
oversubscriptions exceed the total number of Offered Shares available in respect
of such oversubscription privilege, the oversubscribing Investment Parties shall
be cut back with respect to their oversubscriptions on a pro rata basis in
accordance with their respective Pro Rata Fractions or as they may otherwise
agree among themselves.

          (d)  If the Remaining Stockholder desires to purchase all or any part
of the Offered Shares, the Remaining Stockholder shall communicate in writing
its election to purchase to the Stockholder, which communication shall state the
number of Offered Shares the Remaining Stockholder desires to purchase and shall
be given to the Initial Stockholder in accordance with Section 7.05 below within
30 days of the date the Offer
<PAGE>
 
                                                                              11

was made. Such communication shall, when taken in conjunction with the Offer, be
deemed to constitute a valid, legally binding and enforceable agreement for the
sale and purchase of such Offered Shares.

          (e)  If the Remaining Stockholder does not elect to accept the Offer
as to any or all of the Offered Shares within 30 days of the date the Offer is
made, the Initial Stockholder shall send a written notice to the Investment
Parties indicating the number of Offered Shares available for purchase pursuant
to the terms and conditions, including price, set forth in the Offer (the
"Investor Notice"). Any Investment Party which desires to purchase any Offered 
 ---------------      
Shares shall communicate in writing its election to purchase to the Initial
Stockholder, which communication shall state the number of Offered Shares such
Investment Party desires to purchase and shall be given to the Initial
Stockholder in accordance with Section 7.05 below within 30 days of receipt of
the Investor Notice.

          (f)  If the Remaining Stockholder and the Investment Parties do not
purchase all of the Offered Shares, then the Initial Stockholder shall send a
Company Notice to the Company indicating the number of Offered Shares available
for purchase pursuant to the terms and conditions, including price, set forth in
the Offer. The Company shall communicate in writing its election to purchase all
of such Offered Shares and which communication shall be given to the Initial
Stockholder in accordance with Section 7.05 below within 30 days of receipt of
the Company Notice.

          (g)  If the Remaining Stockholder and/or the Investment Parties and/or
the Company elect to purchase, in the aggregate, all of the Offered Shares, any
written communication of an election to so purchase delivered by the Remaining
Stockholder, any Investment Party or the Company shall, when taken in
conjunction with the Offer, be deemed to constitute a valid, legally binding and
enforceable agreement for the sale and purchase of the stated Offered Shares
(subject to subsection (d) above). Sales of the stated Shares to be sold to the
Remaining Stockholder and/or any Investment Party and/or Company pursuant to
this Section 2.03 shall be made at the offices of the Company on the 45th day
following the later of the date (i) of the Offer, if the Remaining Stockholder
elects to purchase all of the Offered Shares, (ii) of the Investor Notice, if
the Remaining Stockholder and/or the Investment Parties elect to purchase all of
the Offered Shares or (iii) of the Company Notice, if the Remaining Stockholder
and/or any Investment Party and/or the Company elects to purchase all of the
Offered Shares (or if such 45th day is not a business day, then on the next
succeeding business day). Such sales shall be effected by the Initial
Stockholder's delivery to the Company of a certificate or certificates
evidencing the Offered Shares to be purchased by the Remaining Stockholder
and/or any Investment Party and/or the Company, duly endorsed for transfer, to
the Company, against payment to the Initial Stockholder of the purchase price
therefor by the party purchasing such Offered Shares.

          (h)  If the Remaining Stockholder and/or the Investment Parties and/or
the Company do not purchase all of the Offered Shares, then, subject to Section
2.05 hereof, all, but not less than all, of the Offered Shares may be sold by
the Stockholder at any time within 180 days after the date the Offer was made.
Any such sale shall be to the Proposed Transferee, at not less than the price
and upon other terms and conditions, if any, not more favorable to the Proposed
Transferee than those specified in the Offer. If the Offered Shares are not sold
within such 180-day period, such Shares shall continue to be subject to the
requirements of a prior offer pursuant to this Section 2.03, If Offered Shares
are sold
<PAGE>
 
                                                                              12

pursuant to this Section 2.03 to any purchaser who is not a party to this
Agreement, the Offered Shares so sold shall no longer be subject to this
Agreement.

          (i)  The rights of first refusal provided in this Section 2.03 shall
not apply with respect to (a) sales of Shares to the Company or (b) sales of
Shares in a Qualified Public Offering.

          SECTION 2.04. Right of First Refusal on Dispositions of the Crowns and
                        --------------------------------------------------------
Investors. (a) Permitted Transfer. A "Permitted Transfer" shall include: (i) any
- ---------      ------------------     ------------------                        
transfer of Shares or Preferred Shares by an Investor or, if neither of the
Crowns is employed by the Company or any of its Subsidiaries or Affiliates at
the time of the proposed transfer, by the Crowns, to a corporation or
corporations or to a partnership or partnerships (or other entity for collective
investment, such as a fund) which is directly or indirectly controlled by,
controlling or under common control with such Investment Party or the officers,
employees, general partners or limited partners of such Investment Party, (ii)
any transfer between any of Berkshire III Corp., Berkshire III, Berkshire IV
Corp., Berkshire IV, Berkshire Investors LLC, Bradley M. Bloom, Jane Brock-
Wilson, Kevin T. Callaghan, Catherine K. Clifford Present Interest Trust,
Caroline M. Clifford Present Interest Trust, John C. Clifford Present Interest
Trust, Russell L. Epker, Carl Ferenbach, Garth H. Greimann, Richard K. Lubin,
Robert J. Small, Ross M. Jones and Ian K. Loring (collectively, the "Berkshire
                                                                     ---------
Group") and (iii) any transfer by (A) any of the natural persons in the
- -----
Berkshire Group or (B) either of the Crowns to any member of his or her family
or to any trust for the benefit of any such individual or family member; 
provided that any such transferee under this Section 2.04 shall agree in writing
- --------                                                                        
with the Company and the Investment Parties, as a condition to such transfer, to
be bound by all of the provisions of this Agreement to the same extent as if
such transferee were the individual. Any such transferee is hereinafter referred
to as a "Permitted Transferee".
         -------------------- 

          (b)  Transfer by the Crowns or Investors. (i) If an Investor or, if 
               -----------------------------------  
neither of the Crowns is employed by the Company or any of its Subsidiaries or
Affiliates at the time of the proposed transfer, the Crowns, or any Permitted
Transferee thereof proposes to transfer Shares or Preferred Shares to anyone
other than a Permitted Transferee or, in the case of an Investor, the partners,
stockholders, officers or employees of such Investor, such Investment Party or
Permitted Transferee thereof shall give notice of such proposed Transfer to each
of the other Investment Parties. Such notice (the "Transfer Notice") shall state
                                                   ---------------        
that it is being delivered under this Section 2.04 and shall state the terms and
conditions of such offer, including the name of the prospective purchaser, the
proposed purchase price per share of such Shares or Preferred Shares (the "Offer
                                                                           -----
Price") and payment terms (including a description of any proposed noncash
- -----                                                                    
consideration), the type of disposition and the number of such shares to be
transferred (the "Offered Investor Shares"). The Transfer Notice shall further
                  -----------------------       
state (i) that the Investor Offerees may acquire, in accordance with the
provisions of this Agreement, any of the Offered Investor Shares for the price
and upon the other terms and conditions, including deferred payment (if
applicable), set forth therein, (ii) that the Investor Offerees may not purchase
any of such Offered Investor Shares unless collectively the Investor Offerees
purchase all of such Offered Investor Shares and (iii) that if all such Offered
Investor Shares are not purchased by the investor Offerees, the Investor
Offerees may exercise their rights provided pursuant to Section 2.05 hereof

          (ii) For a period of 30 days after receipt of the Transfer Notice (the
     "Option Period"), each of the other Investment Parties (individually, an
      -------------
     "Investor
      --------
<PAGE>
 
                                                                              13

      Offeree", and collectively, the "Investor Offerees") may, by notice in
      -------                          -----------------                   
      writing to the Investment Party or Permitted Transferee delivering such
      Transfer Notice, elect in writing to purchase all, but not less than all,
      of the Offered Investor Shares allocated to such Investor Offeree at the
      Offer Price. The right to purchase such Offered Investor Shares shall be
      allocated to the Investor Offerees pro rata (based on the number of Shares
                                         --- ----
      each of the Investor Offerees owns in relation to the total number of such
      Shares owned by all of them); provided that if any Investor Offeree does
                                    --------                                   
      not elect to purchase the Offered Investor Shares which such Investor
      Offeree may purchase pursuant to this Section 2.04, then the other
      Investor Offerees may elect to purchase the remaining Offered Investor
      Shares.

          (iii) If the Investor Offerees do not elect to purchase all of the
       Offered Investor Shares, or if the Investor Offerees fail to purchase all
       of the Offered Investor Shares in accordance with this Section 2.04, all
       but not less than all of the Offered Investor Shares may be transferred,
       but only in accordance with the terms of the Transfer Notice, within six
       months after expiration of the Option Period, after which, if the Offered
       Investor Shares have not been transferred, all restrictions contained
       herein shall again be in full force and effect.

           (iv) The closing of the purchase of any Offered Investor Shares
       pursuant to Section 2.04(b)(ii) hereof shall take place at the principal
       office of the Company on the tenth day after the expiration of the Option
       Period. At such closing, each purchaser of Offered Investor Shares shall
       deliver the Offer Price, on the same terms as set forth in the Transfer
       Notice (including any non-cash consideration described therein), payable
       in respect of the Offered Investor Shares being purchased by such
       Investment Party or Permitted Transferee thereof who delivered the
       Transfer Notice against delivery of certificates duly endorsed and stock
       powers representing the Offered Investor Shares being acquired by such
       Investment Party. All of the foregoing deliveries will be deemed to be
       made simultaneously and none shall be deemed completed until all have
       been completed.

          SECTION 2.05. Come-Along. (a) Except as provided in Section 2.01 and
                        ----------
Section 2.04(a) hereof, and except for transfers by an Investor to any of its
partners, stockholders, officers or employees, no Stockholder, Investor or
Permitted Transferee shall transfer any Shares or Preferred Shares without
complying with the following terms and conditions set forth in Sections 2.05(a)
and 2.05(b) below; provided that this Section 2.05 shall not in any way limit or
                   --------
affect the restrictions of Section 2.02, 2.03 or Section 2.04, as the case may
be, and any Stockholder, Investor or Permitted Transferee may be an Initiating
Shareholder under this Section 2.05 only if such transfer is made in accordance
with Section 2.02, 2.03 or 2.04, as the case may be.

          (b)  Any Stockholder, Investor or Permitted Transferee (the 
"Initiating Shareholder") desiring to transfer his or her Shares shall, after
 ----------------------
complying with the provisions of Section 2.02, 2.03 or 2.04, as the case may be,
give nor less than 30 days' prior written notice of such intended transfer to
each Investment Party (individually, a "Participation Offeree" and
                                        ---------------------
collectively, the "Participation Offerees") and to the Company. Such notice (the
                   ----------------------
"Participation Notice") shall set forth the terms and conditions of such
 --------------------
proposed transfer, including the name of the prospective transferee, the number
of Shares or Preferred Shares proposed to be transferred (the "Participation
                                                               -------------
Securities") by the Initiating Shareholder, the purchase price per Share
- ----------
proposed to be paid therefor, and the payment terms and type of transfer to be
effectuated. The Participation Notice shall
<PAGE>
 
                                                                              14

further state that the Initiating Shareholder complied with Section 2.02, 2.03
or 2.04 hereof, as the case may be, with respect to such proposed transfer and,
if applicable, the Offered Shares were not purchased by the Initial
Stockholders, the Investment Parties or the Company pursuant to any right of
first refusal described in Section 2.02, 2.03 or 2.04 hereof. Within 20 days
following the delivery of the Participation Notice by the Initiating Shareholder
to each Participating Offeree and to the Company, each Participating Offeree
may, by notice in writing to the Initiating Shareholder and to the Company, have
the opportunity and the right to sell to the purchasers in such proposed
transfer (upon the same terms and conditions as the Initiating Shareholder) up
to that number of Shares owned by such Participating Offeree as shall equal the
product of (i) a fraction, the numerator of which is the number of Shares owned
by such Participating Offeree as of the date of such proposed transfer and the
denominator of which is the aggregate number of Shares owned as of the date of
such Participation Notice by each Initiating Shareholder and by all
Participating Offerees, multiplied by (ii) the number of Participation
Securities. The amount of Participation Securities to be sold by an Initiating
Shareholder shall be reduced to the extent necessary to provide for such sales
of Shares or Preferred Shares by Participating Offerees.

          (c)  At the closing of any proposed transfer in respect of which a
Participation Notice has been delivered, the Initiating Shareholder, together
with all Participating Offerees electing to sell Shares or Preferred Shares,
shall deliver to the proposed transferee certificates evidencing the Shares or
Preferred Shares to be sold thereto duly endorsed with stock powers and shall
receive in exchange therefor the consideration to be paid or delivered by the
proposed transferee in respect of such Shares or Preferred Shares as described
in the Participation Notice.

          (d)  The provisions of this Section 2.05 shall not apply to any
transfer (i) pursuant to Section 2.01, (ii) to any Initial Stockholder or any
Investment Party or the Company pursuant to Section 2.02 or 2.03, (iii) to any
Investment Party pursuant to Section 2.04 or (iv) to any Permitted Transferee.

          (e)  The Permitted Transferees, or any transferees described in
Section 2.01 hereof, of any Initiating Shareholder shall have no rights under,
but shall be bound by the terms of, this Section 2.05.

          SECTION 2.06. Take Along. If, at any time prior to a Qualified Public 
                        ----------    
Offering, Investment Parties holding at least 662/3% of the Shares owned by all
Investment Parties (such persons being referred to in this Section 2.06 as the
"Take Alone Group") shall determine to sell or exchange (in a business 
 ----------------                                                      
combination or otherwise) 50% or more of the total number of Shares then
issuable or outstanding in one or a series of bona fide arm's-length
transactions to a third party who is not an Affiliate of the Take Along Group,
then, upon 30 days' written notice of the Take Along Group, which notice shall
include reasonable details of the proposed sale or exchange, including the
proposed time and place of the closing and the consideration to be received by
the Investment Parties (such notice being referred to as the "Sale Request"),
                                                              ------------
each other Investment Party and Initial Stockholder shall be obligated to, and
shall (a) sell, transfer and deliver or cause to be sold, transferred and
delivered, to such third party, that percentage of its or the Stockholders'
Shares or Preferred Shares that is equal to the aggregate percentage of the Take
Along Group's Shares or Preferred Shares being sold or exchanged by the Take
Along Group in the same transaction at the closing thereof (and deliver
certificates for such percentage of its or the Stockholders' Shares or Preferred
Shares at the closing, free
<PAGE>
 
                                                                              15

and clear of all claims, liens and encumbrances), and each Investment Party and
the Stockholders, including the members of the Take Along Group, shall receive
the same consideration per share of Common Stock upon such sale or exchange as
members of the Take Along Group, (b) upon request, consent to the cancelation of
any vested stock options for purchase of shares of Common Stock for an amount
per Share equal to the difference, if any, between the consideration per Share
or Preferred Share referenced in the preceding clause and the exercise price of
such vested stock options, and (c) if Stockholder approval of the transaction is
required, vote its or the Stockholders' Shares or Preferred Shares in favor
thereof.

          SECTION 2.07. Call by the Company. (a) The following terms shall have 
                        -------------------                   
the following definitions for the purposes of this Section 2.07 and Section 2.08
hereof.

          (i)  "Initial Stockholder" shall mean Ted B. Miller, Jr.
                -------------------                                

          (ii) "Cause" in the context of termination of employment of the
                -----
Initial Stockholder shall mean, in each case as determined in good faith by a
majority of the Board exclusive of any member subject to a "Cause" termination:
(x) conviction of or a plea of guilty or nolo contendere to any criminal 
                                         ---- ----------     
violation involving dishonesty, fraud or breach of trust, or any felony which
materially adversely affects the Company; or (y) willful engagement in gross
misconduct in the performance of duties owed the Company that materially
adversely affects the Company.

          (iii) "Disability" used in connection with termination of employment
                 ----------
of the Initial Stockholder shall mean the inability of the Initial Stockholder
for a period of 180 consecutive days to perform in all material respects the
Initial Stockholder's duties to the Company or any of its Subsidiaries because
of serious physical or mental disability or other incapacity as determined by an
independent medical doctor selected by the Board.

          (iv) "Fair Market Value" shall mean the fair market per share value of
                -----------------                                     
shares of Common Stock based on the value of the Company as a going concern,
determined as of the applicable termination date referenced in this Section 2.07
or Section 2.08 hereof on a fully diluted basis assuming the exercise of any
then outstanding exercisable conversion or option rights with respect to
securities of the Company, as determined in good faith by the affirmative vote
of at least a majority of the entire Board, which majority shall exclude the
Initial Stockholder and shall include each of the Preferred Nominee directors
designated by the holders of Preferred Shares under Section 3.01 below. In
making its determination, the Board shall take into consideration such factors
which it deems reasonable and appropriate, but shall not take into account any
minority or illiquidity discount. The determination of Fair Market Value shall
be made by the Board within 30 days of the applicable termination date
referenced in this Section 2.07 or in Section 2.08 hereof and a notice stating
the Fair Market Value and a reasonably detailed description of the calculation
thereof and the basis for such calculation shall be sent to the Initial
Stockholder.

          The Initial Stockholder shall have 30 days from the date of the
delivery of the above notice to object to the determination of Fair Market Value
in writing delivered to the Company with a copy to the Series A Nominees. If the
Initial Stockholder fails to object to such determination within such 30-day
period, the determination of Fair Market Value by the Board shall be conclusive
and binding on the parties. In the event that the Initial Stockholder does
object to the determination within such 30-day period. Fair
<PAGE>
 
                                                                              16

Market Value shall be determined by an appraisal of the shares of Stock in
question. The appraisal will be performed by an investment banking firm that has
not been engaged on a regular basis by the Company or any Investor within the
last two years and shall be selected in the following manner: (a) the Board by
the affirmative vote of a majority of the entire Board, which majority shall
include each of the Preferred Nominees, shall (giving due consideration to the
fee estimates of such firms) nominate at least three such investment banking
firms with experience giving appraisals and in financial analysis of businesses
similar to the Company's business and then (b) the Initial Stockholder shall
select, from among such firms, one firm which shall act as the appraiser
hereunder (the "Appraiser"). The Appraiser will be instructed to complete its
                ---------                                                  
appraisal within 30 days of appointment and will, in making its determination,
not take into account the considerations required to be excluded from the
Board's determination of Fair Market Value set forth above. The determination of
the appraiser shall be conclusive and binding as to the Fair Market Value.

          In the event that the Company is required by the Initial Stockholder
to retain an appraiser, the fees and expenses of such Appraiser shall be borne
(i) by the Company if the determination of Fair Market Value by the Appraiser is
equal to or greater than 90% of the determination made by the Board of Directors
and (ii) by the Initial Stockholder if the determination of Fair Market Value by
the Appraiser is less than 90% of the determination made by the Board; provided,
                                                                       -------- 
that the fees and expenses required to be borne by the initial Stockholder shall
not exceed 10% of the aggregate purchase price to be received by the Initial
Stockholder in the transaction giving rise to the Fair Market Value
determination.

          (v)  "Investment Price" shall mean an amount per share of Common Stock
                ----------------
equal to the price per share paid to the Company for such Common Stock by the
Initial Stockholder.

          (b)  If the employment of the Initial Stockholder by the Company and
its Subsidiaries shall terminate (a "Call Event") for any reason prior to the
                                     ----------
first Qualified Public Offering, the Company and the Investment Parties as a
group, in that order, shall have the right to purchase (subject to, in the case
of the Investment Parties, purchases by the Company)(the "Call Option"), by
                                                          -----------
delivery of a written notice (the "Call Notice") to the terminated Initial
                                   -----------
Stockholder no later than 90 days after the date of such Call Event (the "Call
                                                                          ----
Period"), and the Initial Stockholder and the Initial Stockholder's Permitted
- ------
Transferees (the "Call Group") shall be required to sell any or all of the
                  ----------
shares of Stock which are owned by the members of the Call Group on the date of
such Call Event. Additionally, the Call Group shall be required to exercise any
or all vested Stock Options and immediately after such exercise shall be
required to sell all shares of Common Stock which, as a result of such exercise,
are then owned by the members of the Call Group on the date of such Call Event
(collectively, the "Call Securities") at a price per share of Common Stock equal
                    ---------------
to the Call Price). All stock options held by the terminated Initial Stockholder
which have not vested on the date of the Call Event shall be canceled.

          (c)  If the Company does not elect to purchase all Call Securities
available for purchase, each Investment Party shall have the absolute right to
purchase that number of Call Securities not so purchased as shall be equal to
the number of such Call Securities multiplied by a fraction, the numerator of
which shall be the number of Shares then owned by such Investment Party and the
denominator of which shall be the aggregate number of Shares then owned by all
of the Investment Parties. For purposes of this
<PAGE>
 
                                                                              17

Section 2.07, all of the Common Stock which an Investment Party has the right to
acquire from the Company, directly or indirectly upon the conversion, exercise
or exchange of any securities of the Company then owned by such Investment Party
shall be deemed to be Shares then owned by such Investment Party. The amount of
Call Securities that each Investment Party is entitled to purchase under this
Section 2.07 shall be referred to as its "Pro Rata Call Fraction".
                                          ---------------------- 

          (d)  The Investment Parties shall have a right of oversubscription
such that if any Investment Party fails to exercise its Call Option for the
purchase of Call Securities as to its Pro Rata Call Fraction, the other
Investment Parties shall, among them, have the right to purchase up to the
balance of the Call Securities not so purchased. Such right of oversubscription
may be exercised by an Investment Party by exercising its Call Option as to more
than its Pro Rata Call Fraction. If, as a result thereof, such oversubscriptions
exceed the total number of Call Securities available in respect of such
oversubscription privilege, the oversubscribing Investment Parties shall be cut
back with respect to their oversubscriptions on a pro rata basis in accordance
with their Pro Rata Call Fractions, or as they may otherwise decide among
themselves.

          (e)  For purposes of this Section 2.07, the term "Call Price" shall
                                                            ----------
mean:                                        

          (i)  with respect to shares of Common Stock,

               (aa) in the event of a termination of the employment of the
          Initial Stockholder without Cause or by virtue of his (x) death or
          Disability, (y) Retirement in accordance with Company policy or (z)
          voluntary termination of employment, the Fair Market Value of such
          shares of Common Stock; and

               (bb) in the event of a termination of the employment of the
          Initial Stockholder for Cause, the lower of (x) the Investment Price
          of such shares of Common Stock, or (y) the Fair Market Value of such
          shares of Common Stock; and

          (ii) with respect to any vested stock options,

               (aa) in the event of a termination of the employment of the
          Initial Stockholder without Cause or by virtue of his (x) death or
          disability, (y) retirement in accordance with Company policy or (z)
          voluntary termination of employment, the difference between (1) the
          Call Price, as determined in (i)(aa) above, payable for shares of
          Common Stock and (2) the exercise price of such vested stock options,
          multiplied by the number of shares of Common Stock issuable upon the
          exercise of such vested stock options; and

               (bb) in the event of a termination of the employment of the
          Initial Stockholder for Cause, the difference between (x) the Call
          Price, as determined in (i)(bb) above, payable for shares of Common
          Stock and (y) the exercise price of such vested stock options,
          multiplied by the number of shares of Common Stock issuable upon the
          exercise of such vested stock options.
<PAGE>
 
                                                                              18

          (f)(i) The closing of any purchase of Call Securities shall take place
at the principal office of the Company on the 20th business day after the date
of the Call Notice or on such other date as the parties may agree (the "Call
                                                                        ----   
Option Closing"). At the Call Option Closing, the Company and/or any Investment 
- --------------
Parties purchasing Call Securities, as the case may be, shall deliver to the
Call Group, against delivery of certificates duly endorsed and stock powers
representing the Call Securities, and against the execution, in a form
reasonably satisfactory to the Company, of an agreement assigning or canceling
the stock options, a certified check or checks payable to the terminated Initial
Stockholder and/or the Permitted Transferees, as the case may be, in an amount
equal to the aggregate Call Price payable for such Call Securities subject to
clause (ii) below.

          (ii)   To the extent that payment of the Call Price by the Company in
     cash would violate applicable law or any bank lending agreement to which
     the Company is a party, the Company shall use reasonable efforts to cure
     any such violation or have such violation waived in order to permit payment
     of the Call Price in cash. To the extent the Company remains unable to make
     cash payment as to any portion, or all of, the Call Price, such payment may
     be made by delivery of a note issued by the Company (x) bearing interest at
     a per annum rate of the prime rate as reported in the Wall Street Journal
                                                           ------------------- 
     at the time of issuance plus 2%, or, if lower, the maximum rate permitted
     under applicable law, (y) having a term of five years and (z) which is
     subordinated in right of payment to all other debt of the Company; 
     provided, however, that the Company shall not be obligated to make any
     --------  -------
     payment of principal or interest under such a note if the making of such
     payment would violate applicable law or any bank lending agreement to which
     the Company is a party; provided further, that if at any time the payment 
                             ----------------           
     of any outstanding amount in respect of a note issued for the Call Price
     may be paid in cash without violation of applicable law or any bank lending
     agreement to which the Company is a party, the Company shall promptly pay
     the outstanding principal and interest on any such note to the extent to be
     permitted. All of the foregoing deliveries under clause (i) or (ii) above
     will be deemed to be made simultaneously and none shall be deemed completed
     until all have been completed.

          SECTION 2.08. Put by the Initial Stockholder. (a) If the employment of
                        ------------------------------       
the Initial Stockholder by the Company and its Subsidiaries shall terminate
without Cause or by virtue of his (i) death or Disability or (ii) retirement in
accordance with Company policy (such termination being hereinafter referred to
as a "Put Event"), and the Company and the Investment Parties do not elect to
      ---------
exercise the Call Option in full pursuant to Section 2.07, then the Company
shall give such Stockholder written notice (the "Put Notice") advising him of 
                                                 ----------
his Put Option and specifying the last date on which such Put Option can be
exercised. In such event, in addition to the rights of the Initial Stockholder
to continue to hold Shares, the Initial Stockholder (and his transferees under
Section 2.01(b) and (c)) ("Related Transferees") shall have the right (the "Put
                            -------------------                              ---
Option"), by delivery of written notice to the Company (the "Put Acceptance
- ------                                                       --------------
Notice") within 60 days after the Put Notice to cause the Company to purchase,
- ------
and the Company shall purchase all, or any part of, the Shares which are owned
by the Initial Stockholder or his Related Transferees on the date of such Put
Event and which are not purchased by the Company and the Investment Parties
pursuant to Section 2.07 (collectively, the "Put Securities") as specified in
                                             --------------
the Put Acceptance Notice, at a price per share equal to the Put Price.

          (b)  For purposes of this Section 2.08 the term "Put Price" shall mean
                                                           --------- 
the Fair Market Value of the Shares.
<PAGE>
 
                                                                              19

          (c)  The closing of the purchase of any Put Securities by the Company
pursuant to this Section 2.08 shall take place at the principal office of the
Company not later than 45 business days after the delivery of the Put Acceptance
Notice (the "Put Option Closing"). At the Put Option Closing the Company shall
             ------------------
deliver, against delivery of certificates duly endorsed and stock powers
representing the Shares specified in the Put Notice a certified check or checks
payable to the order of the Initial Stockholder and/or Related Transferees
selling Put Securities as specified in the Put Notice, in an amount equal to the
aggregate purchase price payable for such Put Securities. The Company shall not
be obligated to repurchase Shares under this Section 2.08 or under any other
Section of this Agreement if the Company is prohibited from doing so under
applicable law. In addition, the Company shall not be obligated to make any cash
payments by certified check or otherwise under this Section 2.08 if the making
of such payment would violate the terms of any bank lending agreement to which
the Company is a party. In such event, in lieu of such payment by check, the
Initial Stockholder and his Related Transferees shall have the right to cancel
the Put Notices. If the Stockholder and/or his Related Transferees desire to
proceed with the sale of Put Securities or proceed with the sale, then to the
extent the Company is unable to fund the purchase of the Put Securities with
cash, the Company shall deliver to the Initial Stockholder and/or his Related
Transferees selling Put Securities as specified in the Put Acceptance Notice, a
subordinated note having the term set forth in, and subject to the provisions
of, Section 2.07(f)(ii) above.

          (d)  If and to the extent that, subsequent to a Put Event, the Initial
Stockholder does not give a Put Acceptance Notice within 60 days after receipt
of the Put Notice required to be delivered by the Company under Section 2.08,
all rights to sell Put Securities to the Company pursuant to this Section 2.08
shall terminate.

                                  ARTICLE III

                            Election of Directors.
                            --------------------- 

          SECTION 3.01. Designation of Nominees by Crowns and by Investors.
                        -------------- ----------------------------------- 
(a) So long as the Crowns or their transferees under Section 2.01(b) and (c)
(the "Crown Related Transferees") shall have in the aggregate a 5% or greater
      -------------------------   
interest in the Common Stock of the Company, Robert A. Crown, Barbara Crown
and/or their Crown Related Transferees (collectively, the "Nominating Group"
                                                           ---------------- 
and, individually, a "Nominating Person") shall have the right to designate one
                      -----------------
nominee for election as a director of the Company (a "Crown Nominee"). At least
                                                      ------------- 
ten days prior to any meeting, or written action in lieu of a meeting, of
Stockholders of the Company at or by which directors are to be elected, the
Nominating Group or a Nominating Person shall notify the Company and the
Investors in writing of the Crown Nominee designated by the Nominating Group or
a Nominating Person for election as a director. In the absence of any such
notification, it shall be presumed that the then incumbent Crown Nominee has
been redesignated as the Crown Nominee. in the event that no such nomination is
made by the Nominating Group and either (i) no then incumbent Crown Nominee
exists or (ii) the then incumbent Crown Nominee does not intend to serve as a
director of the Company for the upcoming year, Robert A. Crown shall be
nominated for election without any further action. The initial Crown Nominee is
Robert A. Crown.

          (b)  Of the five directors to be elected by holders of Preferred
Shares pursuant to the terms contained in the Company's Charter, (i) Centennial
IV and
<PAGE>
 
                                                                              20

Centennial V shall each have the right to designate one nominee for election as
a director of the Company; (ii) Berkshire III and either of Berkshire IV Corp.
or Berkshire IV shall each have the right to designate one nominee for election
as a director of the Company; and (iii) Nassau Capital II and NAS I
(collectively, "Nassau") shall have the right to designate one nominee for
                ------
election as a director of the Company (Centennial IV, Centennial V. Berkshire
III, Berkshire IV Corp., Berkshire IV and Nassau are together, the "Nominating
                                                                    ----------
Investors" and individually, a "Nominating Investor") (together, the "Preferred
- ---------                       -------------------                   ---------
Nominees") and individually a "Preferred Nominee"). At least 10 days prior to 
- --------                       -----------------
any meeting (or written action in lieu of a meeting) of stockholders of the
Company at or by which directors are to be elected by the holders of Preferred
Shares, voting separately, each Nominating Investor shall notify the Company and
other Investors in writing of the Preferred Nominee designated by such
Nominating Investor for election as a director. In the absence of any such
notification, it shall be presumed that the Nominating Investor's then incumbent
Preferred Nominee has been redesignated as its Preferred Nominee. The initial
Preferred Nominee of Centennial IV is Jeffrey H. Schutz and of Centennial V,
David Hull, Jr; the initial Preferred Nominee of Berkshire III is Carl Ferenbach
and of Berkshire IV Corp. and Berkshire IV is Garth Greimann, and the initial
Preferred Nominee of Nassau is Randall A. Hack.

          (c)  At each meeting, or written action in lieu of a meeting of
Stockholders of the Company, at or by which a director nominated by the
Nominating Group or a Nominating Person is to be elected, each Investor and
Stockholder shall vote all of its or his or her Shares or Preferred Shares, as
the case may be, to elect as a director of the Company, the nominee designated
in the manner provided in Section 3.01(a).

          (d)  At each meeting, or written action in lieu of a meeting of
Stockholders of the Company, at or by which directors are to be elected by the
holders of Preferred Shares, voting separately, each Investor shall vote all of
its Preferred Shares to elect, as directors of the Company, the nominees
designated in the manner provided in Section 3.01(b).

          (e)  If a Crown Nominee shall cease to serve as a director for any
reason, the Nominating Group or the Nominating Person who designated such Crown
Nominee shall have the right to designate a successor Crown Nominee and each of
the other Investors and Stockholders shall use its best efforts to ensure that
such Crown Nominee is duly elected as a director. If the Nominating Group or a
Nominating Person notify the Company that they desire to remove their Crown
Nominee as a director and/or designate a successor Crown Nominee, the Company
shall, at the request of the Nominating Group or a Nominating Person, use its
best efforts to ensure that a meeting of Stockholders of the Company is promptly
called for such purpose.

          (f)  If a Preferred Nominee shall cease to serve as a director for any
reason, the Nominating Investor which designated such Preferred Nominee shall
have the right to designate a successor Preferred Nominee and each of the other
Investors shall use its best efforts to ensure that such successor Preferred
Nominee is duly elected as a director. If a Nominating Investor notifies the
other Investors that it desires to remove its Preferred Nominee as a director,
each of the other Investors shall use its best effort to ensure that such
Preferred Nominee is duly removed as a director. If a Nominating Investor
notifies the Company that it desires to remove its Preferred Nominee as a
director and/or designate a successor Preferred Nominee, the Company shall, at
the request of such
<PAGE>
 
Nominating Investor, use its best efforts to ensure that a meeting of
stockholders of the Company is promptly called for such purpose.

          SECTION 3.02. Election of General Directors. In addition to the five 
                        -----------------------------
directors elected solely by the holders of Preferred Shares, the director
elected solely by the holders of Class A Stock pursuant to the Company's Charter
and the director nominated by the Nominating Group, and subject to any changes
arising out of or effected pursuant to the Company's By-laws or Charter or
applicable Delaware law, there shall also be designated four other directors
(collectively, the "General Directors" and individually a "General Director")
                    -----------------                      ----------------
pursuant to the terms of this Section 3.02.

          (a)  (i)  The initial four General Directors (the "Initial General 
                                                             ---------------
Directors") shall be designated by the agreement of Stockholders and Investors 
- ---------
as a group holding 662/3% of the outstanding capital stock of the Company
entitled to vote in the election of directors (calculated on an "as converted"
basis). The Initial General Director nominees are J. Landis Martin, Robert F.
McKenzie, Edward C. Hutcheson, Jr. and David L. Ivy.

          (ii) At the meeting (or written action in lieu of a meeting) of 
     stockholders of the Company at or by which General Directors are to be
     elected each Investor and each Stockholder shall vote all of its Shares to 
     elect, as directors of the Company, the General Directors designated in the
     manner provided in Section 3.02.

          (b)  Successor Directors. If a General Director shall cease to serve
               -------------------
as a director, such vacancy shall be filled in accordance with Section
3.02(a)(i); provided that any General Director can be removed for any reason or
            --------
no reason by vote of the stockholders in accordance with Delaware law, the
Company's Charter and/or the Company's By-laws, as applicable, and if so
removed, any successor General Director shall be nominated and shall be elected
by the stockholder vote required under Delaware law, the Company's Charter
and/or the Company's By-laws, as applicable. The Company shall, at the request
of the Investors and/or the Stockholders, use its best efforts to ensure that a
meeting of the Stockholders of the Company is promptly called to effect any such
removal and/or fill any such vacancy.

          SECTION 3.03. Subsidiary Boards of Directors. Unless the directors of
                        ------------------------------
the Company unanimously agree otherwise, the Company shall vote its shares of
stock of its Subsidiaries so as to elect as directors of such Subsidiaries the
persons elected as directors, or as successors to any such directors, of the
Company pursuant to the terms of Section 3.01 and those persons elected as
directors of the Company by the holders of the Class A Stock, as provided in the
Charter of the Company; provided, however, that it is hereby acknowledged that
                        --------  -------
the current directors of the Subsidiaries of the Company are as set forth on
Schedule II and provided further that such directors may remain in office for
                -------- -------
the duration of their respective terms without the unanimous consent of the
directors of the Company.

          SECTION 3.04. Election of Robert A. Crown. As of the closing of the 
                        ---------------------------
transactions contemplated by the Crown Purchase Agreement, Robert A. Crown shall
be elected (A) a member of the Board (as Crown Nominee pursuant to Section 3.01)
and executive committee of the Company and (B) director, president and chief
executive officer of Crown Communication Inc.
<PAGE>
 
                                  ARTICLE IV

                 Representations and Warranties of the Crowns
                 --------------------------------------------

          SECTION 4.01. Each of the Crowns severally represents and warrants to 
the Company that: (a) he or she (i) is an "accredited investor" within the
meaning of Rule 501 under the Securities Act or (ii) has sufficient knowledge
and experience in investing and in the business of the Company so as to be able
to evaluate the risks and merits of its investment in the Company and are able
financially to bear the risk thereof, including the risk of the complete loss of
its investment in the Company;

          (b) he or she has had an opportunity to discuss the Company's 
business, management and financial affairs with the Company's management;

          (c) the Class B Stock is being acquired by him or her for his or her
own account for the purpose of investment and not with a view to or for sale in
connection with any distribution thereof;

          (d) he or she understands that (i) the Class B Stock has not been 
registered under the Securities Act by reason of its issuance in a transaction 
exempt from the registration requirements of the Securities Act pursuant to 
Section 4(2) thereof or Rule 505 or 506 promulgated under the Securities Act, 
(ii) the Class B Stock must be held indefinitely unless a subsequent 
disposition thereof is registered under the Securities Act or is exempt from 
such registration, (iii) the Class B Stock will bear a legend to such effect and
(iv) the Company will make a notation on its transfer books to such effect;  

          (e) (i) he or she will not sell any Class B Stock except pursuant to
registration under the Securities Act or a valid exemption therefrom and (ii) if
her or she sells any Class B Stock pursuant to Rule 144A promulgated under the
Securities Act, they will take all necessary steps in order to perfect exemption
from registration provided thereby, including (x) obtaining on behalf of the
Company information to enable the Company to establish a reasonable belief that
the purchaser is qualified institutional buyer and (y) advising such purchaser
that Rule 144A is being relied upon with respect to such resale;

          (f) he or he has the power and authority to enter and perform his or
her obligations under this Agreement and the other agreements and documents
contemplated by this Agreement;

          (g) neither the execution of this Agreement or the other agreements 
and documents contemplated by this Agreement nor the consummation of the 
transactions contemplated thereby will result in any violation or be in conflict
with (i) the terms of any agreement or other instrument to which he or she is 
a party or (ii) to the best of the Crown's knowledge, any law, regulation, 
judgement, license or order applicable to the Crowns;
  
          (h) each of this Agreement and the other agreements and documents 
delivered pursuant to the terms hereof is a valid and legally binding obligation
of each of the Crowns, enforceable in accordance with its terms (subject as to 
the enforcement of remedies, to the discretion of courts in awarding equitable 
relief and to applicable

<PAGE>
 
                                                                              23

bankruptcy, reorganization, insolvency, moratorium and similar laws affecting
the rights of creditors generally); and

          (i) to the best of the Crowns' knowledge and belief, neither the 
execution of this Agreement nor the consummation to the transactions 
contemplated hereby will result in a transaction prohibited by the Ford 
Foundation Letter.

                                   ARTICLE V

                           Covenants of the Company
                           ------------------------


          The Company covenants and agrees with each of the Investors (except as
indicated in Schedule I hereto) and the Stockholders (herein collectively 
referred to as "Purchasers" and individually as a "Purchaser") that so long as 
                ----------                         ---------              
such Purchaser continues to own in the aggregate at least 25% of the shares of 
Class B Stock issued or issuable to such Purchase (assuming the conversion of 
all Preferred Shares into shares of Class B Stock, appropriately adjusted to 
reflect stock splits, stock dividends, combinations of shares and the like with 
respect thereto but without giving effect to any optional redemption by the 
Company) and, with respect to the covenant contained in Section 5.15 hereof, so 
long as any Purchaser holds any shares of Common Stock;

          SECTION 5.01.  Financial Statements, Reports, etc.  Until the closing 
                         ----------------------------------
of the Company's initial public offering of Common Stock pursuant to an 
effective registration statement filed under the Securities Act, the Company 
shall furnish to each Purchaser;

          (a)  as soon as practicable and in any event within 120 days after the
end of each fiscal year of the Company, a consolidated balance sheet as of the 
end of such fiscal year, a consolidated statement of income and a consolidated 
statement of cash flows of the Company and its Subsidiaries for such year, 
setting forth in each case in comparative form the figures from the Company's 
previous fiscal year (if any), all prepared in accordance with generally 
accepted accounting principles and practices and audited by nationally 
recognized independent certified public accountants;

          (b)  as soon as practicable, and in any case within 45 days after the
end of each fiscal quarter of the Company (except the last quarter of the
Company's fiscal year), quarterly unaudited consolidated financial statements,
including an unaudited consolidated balance sheet, and an unaudited consolidated
statement of income and an unaudited statement of cash flows, together with a
comparison to the Company's operating plan and consolidated budget and
statements of the Chief Financial Officer of the Company explaining any
significant differences in the statements from the Company's consolidated
operating plan and consolidated budget for the period certified by the Company's
Chief Financial Officer that such statements fairly present the consolidated
financial position and consolidated financial results of the Company for the
fiscal quarter covered;

          (c)  as soon as practicable, and in any case within 20 days after the 
end of each calendar month (expect the last month of the Company's fiscal year),
monthly unaudited consolidated financial statements, including an unaudited 
consolidated balance sheet, and an unaudited consolidated statement of income 
and unaudited consolidated statement of cash flows, together with a comparison 
to the Company's consolidated

<PAGE>
 
                                                                              24

operating plan and consolidated budget and statements of the Chief Financial 
Officer of the Company explaining any significant differences in the statements
from the Company's consolidated operating plan and consolidated budget for the 
month covered and certified by the Company's Chief Financial Officer that such 
statements fairly present the consolidated financial position and consolidated 
financial results of the Company for the month covered;

          (d)  as soon as practicable and in any event no later than 30 days 
after the close of each fiscal year of the Company (i) an annual consolidated 
operation plan and consolidated budget, prepared on a monthly basis, for the 
next immediate fiscal year, and (ii) a five-year consolidated strategic plan for
the subsequent five fiscal years of the Company. The Company will also promptly 
furnish to such Purchaser an amendment to the annual budget and strategic plan, 
if any;

          (e)  promptly (i) following receipt by the Company, each audit 
response letter, accountant's management letter and other written report 
submitted to the Company by its independent public accountants in connection 
with an annual or interim audit of the books of the Company or any of its 
Subsidiaries; (ii) after the commencement thereof, notice of all actions, suits,
claims, proceedings, investigations and inquiries that could materially 
adversely affect the Company or any of its Subsidiaries; (iii) upon sending, 
making available or filing the same, all press releases, reports and financial 
statements that the Company sends or makes available to its stockholders or 
directors or files with the Commission; and (iv) such other information 
regarding the business, prospects, financial condition, operations, property or 
affairs of the Company and its Subsidiaries as such Purchaser reasonably may 
request from time to time; and

          (f)  each Purchaser will hold all information received pursuant to 
this Section 5.01 and marked "confidential" in confidence, and will not use or
disclose any of such information any third party, except (i) to the extent such 
information is made publicly available by the Company, (ii) to the extent any 
Purchaser which is a partnership or other venture capital fund desires, 
according to its policies as in effect from time to time, to disclose summary or
financial information about the Company to investors in and other partners of 
such Purchaser as part of such Purchase's regular communication process with its
investors and partners; (iii) to the extent required by the National Association
of Insurance Commissioners or any similar organization, or any nationally 
recognized rating agency that requires access to such information.

          SECTION 5.02 Corporate Existence. The Company shall maintain and,
                       -------------------
except as otherwise permitted herein, cause each of its Subsidiaries to
maintain, their respective corporate existence, rights and franchises in full
force and effect.

          SECTION 5.03  Properties, Business, Insurance.  The Company shall 
                        -------------------------------
maintain and cause each of its Subsidiaries to maintain as to their respective 
properties and business, with financially sound and reputable insurers, 
insurance against such casualties and contingencies and of such types and in 
such amounts as is customary for companies similarly situated, which insurance 
shall be deemed by the Company to be sufficient.  The Company shall also 
maintain in effect "key person" life insurance policies, payable to the Company,
on the life of each of Ted B. Miller, Jr., David L. Ivy and Robert A. Crown (so 
long as each remains an employee of the Company), in the amount of $2,000,000 
each.  The Company shall not cause or permit any assignment or change in 
beneficiary and shall
<PAGE>
 
                                                                              25
 
not borrow against any such policy. If requested by the Purchasers holding at
least a majority of the outstanding Preferred Shares, the Company will add one
designee of such Purchasers as a notice party for each such policy and shall
request that the issuer of each policy provide such designee with ten days'
notice before such policy is terminated (for failure to pay premiums or
otherwise) or assigned or before any change is made in the beneficiary thereof.

          SECTION 5.04. Restrictive Agreements Prohibited. Neither the Company 
                        --------------------------------- 
nor any of its Subsidiaries shall become a party to any agreement which by its 
terms restricts the Company's performance of this Agreement or the Company's 
Charter.

          SECTION 5.05. Transactions with Affiliates. Except for transactions 
                        ---------------------------- 
contemplated by this Agreement or as otherwise approved by the Board (including
the approval of at least 66 2/3% of the directors nominated by the holders of
the Preferred Shares and the Nominating Group, considered as a group), neither
the Company nor any of its Subsidiaries shall enter into any transaction with
any director, officer, employee or holder of more than 5% of the outstanding
capital stock of any class or series of capital stock of the Company or any of
its Subsidiaries, member of the family of any such person, or any corporation,
partnership, trust or other entity in which any such person, or member of the
family of any such person, is a director, officer, trustee, partner or holder of
more than 5% of the outstanding capital stock thereof, except for transactions
on customary terms related to such person's employment.

          SECTION 5.06. Right of First Refusal. The Company shall, prior to any 
                        ---------------------- 
issuance by the Company of any of its securities (other than debt securities 
with no equity feature), offer to each Purchaser by written notice the right, 
for a period of 30 days, to purchase all of such securities for cash at an 
amount equal to the price or other consideration for which such securities are 
to be issued; provided, however, that the first refusal rights of the Purchasers
              --------  ------- 
pursuant to this Section 5.06 shall not apply to securities issued (A) upon 
conversion of any of the Preferred Shares, (B) as a stock dividend or upon any 
subdivision of shares of any series or class of Preferred Stock or Common Stock,
provided that the securities issued pursuant to such stock dividend or 
subdivision are limited to additional shares of Preferred Stock or Common Stock,
(C) pursuant to subscriptions, warrants, options, convertible securities, or 
other rights which are listed in Schedule II as being outstanding on the date of
this Agreement or listed on Schedule II as being reserved for grant pursuant to 
any stock option plan listed thereon, (D) solely in consideration for the 
acquisition (whether by merger or otherwise) by the Company or any of its 
subsidiaries of all or substantially all of the stock or assets of any other 
entity, (E) pursuant to a Qualified Public Offering, and (F) upon the exercise 
of any right which was not itself in violation of the terms of this Section 
5.06. The Company's written notice to the Purchasers shall describe the 
securities proposed to be issued by the Company and specify the number, price 
and payment terms. Each Purchaser may accept the Company's offer as to the full 
number of securities offered to it or any lesser number, by written notice 
thereof given by it to the Company prior to the expiration of the aforesaid 30 
day period, in which event the Company shall promptly sell and such Stockholder 
or Investor shall buy, upon the terms specified, the number of securities agreed
to be purchased by such Purchaser. Notwithstanding the foregoing, if the 
Purchasers agree, in the aggregate, to purchase more than the full number or 
securities offered by the Company, then each Purchaser accepting the Company's 
offer shall first be allocated the lesser of (i) the number of securities which 
such Purchaser agreed to purchase and (ii) the number of securities as is equal 
to the full number of securities offered by the Company multiplied by a 
fraction,
<PAGE>
 
                                                                              26

the numerator of which shall be the number of shares of Class B Stock held by 
such Purchaser as of the date of the Company's notice of offer (treating such 
Purchaser, for the purpose of such calculation, as the holder of the number of 
shares of Class B Stock which would be issuable to such Purchaser upon
conversion, exercise or exchange of all securities (including but not limited to
the Preferred Shares) held by such Purchaser on the date such offer is made,
that are convertible exercisable or exchangeable into or for (whether directly
or indirectly) shares of Class B Stock) and the denominator of which shall be
the aggregate number of shares of Class B Stock (calculated as aforesaid) held
on such date by all Purchasers who accepted the Company's offer, and the balance
of the securities (if any) offered by the Company shall be allocated among the
Purchasers accepting the Company's offer in proportion to their relative equity
ownership interests in the Company (calculated as aforesaid); provided that no
                                                              --------
Purchaser shall be allocated more than the number of securities which such
Purchaser agreed to purchase; and provided further that in cases covered by this
                                  -------- ------- 
sentence all Purchasers shall be free at any time prior to 90 days after the
date of its notice of offer to the Purchasers to offer and sell to any third-
party or parties the number of such securities not agreed by the Purchaser to be
purchased by them, at a price and on payment terms no less favorable to the
Company than those specified in such notice of offer to the Purchasers. However,
if such third-party sale or sales are not consummated within such 90-day period,
the Company shall not sell such securities as shall not have been purchased
within such period without again complying with this Section 5.06.

          SECTION 5.07.  Management Rights. Until the closing of the Company's 
                         -----------------
initial public offering of Common Stock pursuant to an effective registration 
statement filed under the Securities Act.

          (a)  Each Purchaser (regardless of whether such Purchaser currently 
has a designee on the Company's Board) shall be entitled to designate an 
observer to attend any meeting of the Board of the Company or of any Subsidiary 
or any committee thereof. Such observer may, at the reasonable discretion of the
Board, participate in Board or committee discussions and may address the Board 
or committee with respect to the Purchaser's concerns regarding significant
business issues respecting the Company or any such Subsidiary. Upon request, the
Company shall, and shall cause any Subsidiary to, send to such observer copies
of all meeting consents and other material provided to the Company directors at
the same time and manner as they are sent to the directors. The Company shall
have the right to exclude an observer from the Board discussions upon advice of
counsel that such exclusion is necessary to protect highly confidential
proprietary information or for similar reasons. Any observer shall comply with
reasonable confidentiality provisions, including without limitation the
execution of customary confidentiality agreements.

          (b)  The Company shall permit, and shall cause each Subsidiary to 
permit, each Purchaser (regardless of whether such Purchaser currently has a 
designee on the Company's Board) and such persons as it may designate to visit 
and inspect any of the properties of the Company and its Subsidiaries, examine 
their books and take copies and extracts therefrom, discuss the affairs, 
finances and accounts of the Company and any Subsidiary with their officers, 
employees and public accountants (and the Company hereby authorizes said 
accountants to discuss with such Purchaser and such designees such affairs, 
finances and accounts), and consult with and advise the management of the 




<PAGE>
 
                                                                              27
 
Company and any Subsidiary as to their affairs, finances and accounts, all at 
reasonable times and upon reasonable notice.

     SECTION 5.08. Expenses of Directors and Observers. The Company shall 
                   ------------------------------------
promptly reimburse in full, (a) each observer of a Purchaser (including, for
purposes of this Section, its affiliated Purchasers, taken as a group) which
does not have a representative on the Board and which has invested in the
aggregate at least $7.4 million in the Company, for all reasonable out-of-pocket
expenses incurred in attending each domestic meeting of the Board of the Company
or any Subsidiary or any committee thereof, and (b) each director of the Company
who is not an employee of the Company and who was elected as a director solely
or in part by the holders of the Preferred Shares, for all reasonable out-of-
pocket expenses incurred in attending each meeting of the Board of the Company
or any Subsidiary or any committee thereof.

     SECTION 5.09. Board of Directors Meeting. The Company shall use its best
                   ---------------------------  
efforts to ensure that meetings of the Board of the Company and of the Company's
Subsidiaries Castle Tower Corporation, TEA Group Incorporated and Crown
Communication Inc. are held at least four times each year and at least once each
quarter.

     SECTION 5.10. By-laws. The Company shall at all times cause its By-laws and
                   -------    
those of its Subsidiaries to provide that (a) unless otherwise required by the
laws of the State of Delaware or, as applicable, the Commonwealth of
Pennsylvania, (i) any two directors and (ii) any holder or holders of at least
25% of the shares of Class B Stock issued or issuable to such Purchaser(s)
(assuming the conversation of all Preferred Shares held by such Purchaser(s)
into shares of Class B Stock), shall have the right to call a meeting of the
Board of the Company or its Subsidiaries or the Stockholders of the Company and
(b) the number of directors fixed in accordance therewith shall in no event
conflict with any of the terms or provisions of the Preferred Stock as set forth
in the Charter or this Agreement. The Company and its Subsidiaries shall at all
times maintain provisions in their By-laws and/or articles of incorporation
indemnifying all directors against liability and absolving all directors from
liability to the Company and its Stockholders to the maximum extent permitted
under the laws of the state of their incorporation.

     SECTION 5.11. Employee Nondisclosure and Developments Agreements. The
                   --------------------------------------------------
Company shall use its best efforts to obtain, and shall cause its Subsidiaries
to use their best efforts to obtain, an Employee Nondisclosure and Developments
Agreement in such form as shall be approved by the Board from all future
officers, key employees and other employees who will have access to confidential
information of the Company or any of its Subsidiaries, upon their employment by
the Company or any of its Subsidiaries.

     SECTION 5.12. Compliance with Laws. The Company shall and shall cause its
                   -------------------- 
Subsidiaries to, comply with all applicable laws, rules, regulations and
orders noncompliance with which could materially adversely affect its business
or condition, financial or otherwise.

     
     SECTION 5.13. Keeping of Records and Books of Account. The Company shall
                   ---------------------------------------  
keep, and cause each Subsidiary to keep, adequate records and books of account,
in which complete entries will be made in accordance with generally accepted
accounting principles consistently applied, reflecting all financial
transactions of the company and such Subsidiaries, and in which, for each fiscal
year, all proper reserves for

<PAGE>
 
                                                                              28


depreciation, depletion, obsolescence, amortization, taxes, bad debts and other 
purposes in connection with its business shall be made.

          SECTION 5.14.  U.S. Real Property Interest Statement. (a) The Company 
                         -------------------------------------
shall use its best efforts, consistent with sound commercial practice and 
overriding economic or business interest of the Company as determined by the 
Company using reasonable business judgment, to avoid becoming a "U.S. real 
property holding company" within the meaning of Sections 897(c)(1)(B) and 
897(c)(2) of the Code and Treasury Regulations 1.897-2(b)("U.S. Real Property 
                                                           ------------------
Holding Company").
- ---------------

          (b)  Notwithstanding the above, should the Company determine that it 
has become a U.S. Real Property Holding Company, it shall provide prompt written
notice to the Purchasers following any "determination date" as defined in 
Treasury Regulation Section 1.8972(c)(i)) on which the Company becomes a United 
States Real Property Holding Company. In addition, upon a written request by a 
Purchaser, the Company shall provide the Purchaser with a written statement 
informing the Purchaser whether such Purchaser's interest in the Company 
constitutes a "U.S. real property interest" within the meaning of Treasury 
Regulation Section 1.897-1(c)("U.S. Real Property Interest"). The Company's 
                               --------------------------- 
determination shall comply with the requirements of Treasury Regulation Section 
1.897-2(h)(1) or any successor regulation, and the Company shall provide timely 
notice to the Internal Revenue Service, in accordance with and to the extent 
required by Treasury Regulation Section 1.897-2(h)(2) or any successor 
regulation, that such statement has been made. The Company's written statement 
to a Purchaser's written request, if reasonably possible, therefor. The 
Company's obligation to furnish a written statement pursuant to this Section 
5.14 shall continue notwithstanding the fact that a class of the Company's stock
may be regularly traded on an established securities market.

          SECTION 5.15.  International Investment Survey Act of 1976. The 
                         -------------------------------------------
Company shall use its best efforts to file on a timely basis all reports
required of it under 22 U.S.C. Section 3104, or any similar statute, relating 
to a foreign person's direct or indirect investment in the Company.

          SECTION 5.16.  Rule 144A Information. The Company shall provide the 
                         ---------------------
Purchasers, upon request, with such written information and shall take such 
reasonable actions as may be required to permit the Purchasers to resell any 
shares of the Company's capital stock pursuant to Rule 144A promulgated under 
the Securities Act.

          SECTION 5.17.  Payment of Taxes. Pay and discharge all taxes, 
                         ----------------
assessments and governmental charges or levies imposed upon it or upon its 
income or profits or business, or upon any properties belonging to it, prior to 
the same being due and payable to cause its Subsidiaries to do likewise.
<PAGE>
 
                                                                              29

          SECTION 5.18. Negative Covenants of the Company. Without limiting any 
                        ---------------------------------
other covenants and provisions hereof, the Company covenants and agrees that, as
long as at least 25% of the Class B Stock outstanding (determined on a 
post-conversion basis of the Preferred Stock to Class B Stock) is held by the 
Purchasers, it will comply with and observe the following covenants and 
provisions, and will not, without the prior approval of two-thirds of the 
representatives of the Purchasers on the Board:

          (a)  Liens. Except with respect to Senior Debt, create, incur, assume
               -----
     or suffer to exist, or permit any Subsidiary to create, incur, assume or
     suffer to exist, any mortgage, deed of trust, pledge, lien, security
     interest or other charge or encumbrance (including the lien or retained
     security title of a conditional vendor) of any nature, upon or with respect
     to any of its properties, now owned or hereinafter acquired, or assign or
     otherwise convey any right to receive income, except that the foregoing
     restrictions shall not apply to mortgages, deeds of trust, pledges, liens,
     security interests or other charges or encumbrances:
     
                  (i) for taxes, assessments or governmental charges or levies 
          on property of the Company or any Subsidiary if the same shall not at
          the time be delinquent or thereafter can be paid without penalty, or
          are being contested in good faith and by appropriate proceedings;

                 (ii) imposed by law, such as carriers', warehousemen's and
          mechanics' liens and other similar liens arising in the ordinary
          course of business;

                (iii) arising out of pledges or deposits under workmen's
          compensation laws, unemployment insurance, old age pensions, or other
          social security or retirement benefits, or similar legislation;

                 (iv) securing the performance of bids, tenders, contracts
          (other than for the repayment of borrowed money), statutory
          obligations and surety bonds;

                  (v) in the nature of zoning restrictions, easements and rights
          or restrictions of record on the use of real property which do not
          materially detract from its value or impair its use;

                 (vi) arising by operation of law in favor of the owner or 
          sublessor of leased premises and confined to the property rented;

                (vii) arising from any litigation or proceeding which is being 
          contested in good faith by appropriate proceedings; provided, however,
                                                              --------  -------
          that no execution or levy has been made; and

               (viii) which secure the Note or other Indebtedness assumed 
          pursuant to the Crown Purchase Agreement.

          (b)  Indebtedness. Create, incur, assume or suffer to exist, or permit
               ------------
     any Subsidiary to create, incur, assume or suffer to exist, any liability
     with respect to Indebtedness except for:

<PAGE>
 
                                                                              30

                    (i)   Current Liabilities, other than for borrowed money,
               which are incurred in the ordinary course of business;

                    (ii)  Indebtedness with respect to lease obligations;
               provided that such lease obligations do not violate Section
               --------
               5.18(c) below;

                    (iii) Indebtedness (x) represented by the Note, (y) assumed
               pursuant to the Crown Purchase Agreement or (z) all or part of
               the proceeds of which are used to refinance the Note,
               irrespective of the dollar amount of such refinancing; and

                    (iv)  Senior Debt.

               (c)  Lease Obligations. Create, incur, assume or suffer to exist,
                    -----------------
          or permit any Subsidiary to create, incur, assume or suffer to exist,
          any obligations as lessee for the rental or hire of real or personal
          property in connection with any sale and leaseback transaction; or
          become obligated to pay any rent for real property or personal
          property under any lease with an original term, including any lessor
          options to renew or extend, of more than three years if the aggregate
          of consolidated fixed annual rent which would be payable in any fiscal
          year by the Company and its Subsidiaries under all such leases would
          exceed $250,000.

               (d)  Assumptions or Guaranties of Indebtedness other Persons.
                    -------------------------------------------------------
          Except with respect to Senior Debt, assume, guarantee, endorse or
          otherwise become directly or contingently liable on, or permit any
          Subsidiary to assume, guarantee, endorse or otherwise become directly
          or contingently liable on (including, without limitation, liability by
          way of agreement, contingent or otherwise, to purchase, to provide
          funds for payment, to supply funds to or otherwise invest in the
          debtor or otherwise to assure the creditor against loss) any
          Indebtedness of any other person, except for guaranties by endorsement
          of negotiable instruments for deposit or collection in the ordinary
          course of business and Indebtedness specified in paragraph (b) of this
          Section 5.18.

               (e)  Mergers, Sale of Assets, etc. Merge or consolidate with, or
                    ----------------------------
          sell, assign, lease or otherwise dispose of or voluntarily part with
          the control of (whether in one transaction or in a series of
          transactions) a material portion of its assets (whether now owned or
          hereinafter acquired) or sell, assign or otherwise dispose of (whether
          in one transaction or in a series of transactions) any of its accounts
          receivable (whether now in existence or hereinafter created) at a
          discount or with recourse to, any person, or permit any Subsidiary to
          do any of the foregoing, except for sales or other dispositions of
          assets in the ordinary course of business and except that (i) any
          Subsidiary may merge into or consolidate with or transfer assets to
          any other Subsidiary, (ii) any Subsidiary may merge into or transfer
          assets to the Company, and (iii) the Company may merge any person into
          it or otherwise acquire such person as long as the Company is the
          surviving entity, such merger or acquisition does not result in the
          violation of any of the provisions of this Agreement or the Charter
          and no such violation exists at the time of such merger or
          acquisition; provided that such merger or acquisition does not result
                       --------
          in the issuance (in one or more transactions) of shares of the voting
          stock of the Company representing in the aggregate more than 20% of
          the total outstanding
<PAGE>
 
                                                                              31

          voting stock of the Company, on a fully diluted basis, immediately
          following the issuance thereof.

               (f)  Investments in Other Persons. Make or permit any Subsidiary
                    ----------------------------
          to make, any loan or advance to any person, or purchase, otherwise
          acquire, or permit any Subsidiary to purchase or otherwise acquire,
          the capital stock, assets comprising the business of, obligations of,
          or any interest in, any person, except:

                    (i)   transactions by the Company or its Subsidiaries set
               forth in Schedule II hereof;

                    (ii)  investments by the Company or a Subsidiary in
               evidences of indebtedness issued or fully guaranteed by the
               United States of America and having a maturity of not more than
               one year from the date of acquisition;

                    (iii) investments by the Company or a Subsidiary in
               certificates of deposit, notes, acceptances and repurchase
               agreements having a maturity of not more than one year from the
               date of acquisition issued by a bank organized in the United
               States having capital, surplus and undivided profits of at least
               $100,000,000 and whose parent holding company has long-term debt
               rated Aa 1 or higher, and whose commercial paper (if rated) is
               rated Prime 1, by Moody's Investors Service, Inc.;

                    (iv)  loans or advances from a Subsidiary to the Company or
               to another Subsidiary of the Company or by the Company to a
               Subsidiary;

                    (v)   investments by the Company or a Subsidiary in the
               highest-rated commercial paper having a maturity of not more than
               one year from the date of acquisition; and

                    (vi)  other loans, advances and investments not exceeding
               10% of consolidated net worth in the aggregate, at any one time
               outstanding including, without limitation, loans and advances to
               officers and employees of the Company or any Subsidiary.

               (g)  Distributions. Declare or pay any dividends, purchase,
                    -------------
          redeem, retire, or otherwise acquire for value any of its capital
          stock (or rights, options or warrants to purchase such shares) now or
          hereafter outstanding, return any capital to its stockholders as such,
          or make any distribution of assets to its stockholders as such, or
          permit any Subsidiary to do any of the foregoing (such transactions
          being hereinafter referred to as "Distributions"), except that
                                             -------------     
          nothing herein contained shall prevent the Company from:

                    (i)   effecting a stock split or declaring or paying any
               dividend consisting of shares of any class of capital stock to
               the holders of shares of such class of capital stock;

                    (ii)  redeeming any stock of a deceased stockholder out of
               insurance held by the Company on that stockholder's life;
<PAGE>
 
                                                                              32

                    (iii) effecting the repurchase of stock issued to employees
               pursuant to stock plans or arrangements approved by the Board,
               including the representatives of the Purchasers on the Board;

                    (iv)  redeeming shares of Preferred Stock pursuant to the
               terms of the Charter; or

                    (v)   making payment of dividends with respect to the Senior
               Preferred Stock pursuant to the terms of the Charter.

               (h)  Dealings with Affiliates. Enter or permit any Subsidiary to
                    ------------------------
          enter into any transaction with any holder of 5% or more of any class
          of capital stock of the Company, or any member of their families or
          any corporation or other entity in which any one or more of such
          stockholders or members of their immediate families directly or
          indirectly holds 5% or more of any class of capital stock except in
          the ordinary course of business and on terms not less favorable to the
          Company or the Subsidiary than it would obtain in a transaction
          between unrelated parties.

               (i)  Maintenance of Ownership of Subsidiaries. Sell or otherwise
                    ----------------------------------------
          dispose of any shares of capital stock of any Subsidiary, except to
          the Company or another Subsidiary, or permit any Subsidiary to issue,
          sell or otherwise dispose of any shares of its capital stock or the
          capital stock of any Subsidiary, except to the Company or another
          Subsidiary; provided, however, that nothing herein contained shall
                      --------  -------
          prevent any merger, consolidation or transfer of assets permitted by
          Section 5.18(e).

               SECTION 5.19   Reserve for Shares Issued Upon Conversion. The
                              -----------------------------------------
     Company shall at all times reserve and keep available out of its authorized
     but unissued shares of Class B Stock, for the purpose of effecting the
     conversion of the Preferred Shares and otherwise to comply with the terms
     of this Agreement, such number of its duly authorized shares of Common
     Stock as shall be sufficient to effect the conversion of the Preferred
     Shares from time to time outstanding or otherwise to comply with the terms
     of this Agreement. If at any time the number of authorized but unissued
     shares of Common Stock shall not be sufficient to effect the conversion of
     or otherwise to comply with the terms of this Agreement, the Company will
     forthwith take such corporate action as may be necessary to increase its
     authorized but unissued shares of Common Stock to such number of shares as
     shall be sufficient for such purposes. The Company will obtain any
     authorization, consent, approval or other action by, or make any filing
     with, any court or administrative body that may be required under
     applicable state securities laws in connection with the issuance of shares
     of Common Stock upon conversion of the Preferred Shares.


                                  ARTICLE VI

                          Legends; Registration Rights
                          ----------------------------

               SECTION 6.01.  Restrictive Legend. Each certificate representing
                              ------------------
     shares of Restricted Stock or Preferred Stock shall, except as otherwise
     provided in this Section 6.01 or in Section 6.02, be stamped or otherwise
     imprinted with a legend substantially in the following form;
<PAGE>
 
                                                                              33

     "THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR
     ANY STATE SECURITIES LAWS AND MAY NOT BE TRANSFERRED OR OTHERWISE DISPOSED
     OF UNLESS IT HAS BEEN REGISTERED UNDER SUCH ACT AND ALL SUCH APPLICABLE
     LAWS OR AN EXEMPTION FROM REGISTRATION IS AVAILABLE."

A certificate shall not bear such legend if in the opinion of counsel
satisfactory to the Company (it being agreed that the opinion of any of Testa,
Hurwitz & Thibeault, Hutchins, Wheeler & Dittmar or Kirkpatrick & Lockhart shall
be satisfactory) the securities represented thereby may be publicly sold without
registration under the Securities Act and any applicable state securities laws.

          SECTION 6.02. Notice of Proposed Transfer. Prior to any proposed 
                        ---------------------------                       
transfer of any Restricted Stock or Preferred Stock (other than under the
circumstances described in Sections 6.03, 6.04 or 6.05), the holder thereof
shall give written notice to the Company of its intention to effect such
transfer. Each such notice shall describe the manner of the proposed transfer
and, if requested by the Company, shall be accompanied by an opinion of counsel
satisfactory to the Company (it being agreed that the opinion of any of Testa,
Hurwitz & Thibeault, Hutchins, Wheeler & Dittmar or Kirkpatrick & Lockhart shall
be satisfactory) to the effect that the proposed transfer may be effected
without registration under the Securities Act and any applicable state
securities laws, whereupon the holder of such stock shall be entitled to
transfer such stock in accordance with the terms of its notice; provided,
                                                                --------   
however, that no such opinion of counsel shall be required for a transfer,
- -------
without receipt of consideration, to an Affiliate. Each certificate for
Restricted Stock or Preferred Stock transferred as above provided shall bear the
legend set forth in Section 6.01, except that such certificate shall not bear
such legend if (a) such transfer is in accordance with the provisions of Rule
144 (or any other rule permitting public sale without registration under the
Securities Act) or (b) the opinion of counsel referred to above is to the
further effect that the transferee and any subsequent transferee (other than an
Affiliate of the Company) would be entitled to transfer such securities in a
public sale without registration under the Securities Act. The restrictions
provided for in this Section 6.02 shall not apply to securities which are not
required to bear the legend prescribed by Section 6.01 in accordance with the
provisions of that Section.

          SECTION 6.03. Required Registration. (a) At any time after the 
                        --------------------- 
earliest of (i) six months after the first registration statement covering a
public offering of securities of the Company under the Securities Act shall have
become effective, (ii) six months after the Company shall have become a
reporting company under Section 12 of the Exchange Act, and (iii) July 1, 1999,
the holders of Restricted Stock constituting at least 33% of the total shares of
Restricted Stock then issuable or outstanding may request the Company to
register under the Securities Act all or any portion of the shares of Restricted
Stock held by such requesting holder or holders for sale in the manner specified
in such notice, provided that the reasonably anticipated aggregate net proceeds
                --------
to the sellers from such public offering would exceed $5,000,000. For purposes
of this Section 6.03 and Sections 6.04 and 6.05, the term "Restricted Stock"
                                                           ----------------
shall be deemed to include, without limitation, the number of shares of
Restricted Stock which would be issuable to a holder of Preferred Shares upon
conversion of all Preferred Shares held by such holder at such time, provided, 
                                                                     --------
however, that the only securities which the Company shall be required to
- -------
register pursuant hereto shall be shares of Common Stock, and
 
<PAGE>
 
                                                                              34

provided further, however, that, in any underwritten public offering 
- ----------------  -------
contemplated by this Section 6.03 or Sections 6.04 and 6.05, the holders of
Preferred Shares shall be entitled to sell such Preferred Shares to the
underwriters for conversion and sale of the shares of Common Stock issued upon
conversion thereof. Notwithstanding anything to the contrary contained herein,
no request may be made under this Section 6.03 within 90 days after the
effective date of a registration statement filed by the Company covering a firm
commitment underwritten public offering in which the holders of Restricted Stock
shall have been entitled to join pursuant to Sections 6.04 or 6.05 and in which
there shall have been effectively registered all shares of Restricted Stock as
to which registration shall have been requested.

          (b)  Following receipt of any notice under this Section 6.03, the
Company shall immediately notify all holders of Restricted Stock from whom
notice has not been received and shall use its best efforts to register under
the Securities Act, for public sale in accordance with the method of disposition
specified in such notice from requesting holders; the number of shares of
Restricted Stock specified in such notice (and in all notices received by the
Company from other holders within 20 days after the giving of such notice by the
Company). If such method of disposition shall be an underwritten public
offering, the holders of a majority of the shares of Restricted Stock to be sold
in such offering may designate the managing underwriter of such offering,
subject to the approval of the Company, which approval shall not be unreasonably
withheld or delayed. The Company shall be obligated to register Restricted Stock
pursuant to this Section 6.03 on two occasions only, provided, however, that
                                                     --------  -------
such obligation shall be deemed satisfied only when a registration statement
covering all shares of Restricted Stock specified in notices received as
aforesaid, for sale in accordance with the method of disposition specified by
the requesting holders, shall have become effective and, if such method of
disposition is a firm commitment underwritten public offering, all such shares
shall have been sold pursuant thereto unless (i) any such registration statement
does not become effective due to the withdrawal thereof by or on the request of
the holders of 66 2/3% of the shares of Restricted Stock to be registered, or
(ii) the reason all shares of Restricted Stock specified in notices pursuant to
this Section 6.03 are not registered is due to a limitation on the registration
of shares by the managing underwriter or the voluntary withdrawal of any such
shares from registration by the holder thereof

          (c)  The Company shall be entitled to include in any registration
statement referred to in this Section 6.03, for sale in accordance with the
method of disposition specified by the requesting holders, shares of Common
Stock to be sold by the Company for its own account, except as and to the extent
that, in the opinion of the managing underwriter (if such method of disposition
shall be an underwritten public offering), such inclusion would adversely affect
the marketing of the Restricted Stock to be sold. Except for registration
statements on Forms S-4, S-8 or any successor thereto, the Company will not file
with the Commission any other registration statement with respect to its Common
Stock, whether for its own account or that of other stockholders, from the date
of receipt of a notice from requesting holders pursuant to this Section 6.03
until the completion of the period of distribution of the registration
contemplated thereby.

          SECTION 6.04 "Piggy-Back" Registration. If the Company at any time
                        ------------------------
(other than pursuant to Section 6.03 or Section 6.05) proposes to register any
of its securities under the Securities Act for sale to the public, whether for
its own account or for the account of other security holders or both (except
with respect to registration statements on Forms S-4, S-8 or another form not
available for registering the Restricted
<PAGE>
 
                                                                              35

Stock for sale to the public), each such time it will give written notice to all
holders of outstanding Restricted Stock of its intention so to do. Upon the
written request of any such holder, received by the Company within 20 days after
the giving of any such notice by the Company, to register any of its Restricted
Stock, the Company will use its best efforts to cause the Restricted Stock as to
which registration shall have been so requested to be included in the securities
to be covered by the registration statement proposed to be filed by the Company,
all to the extent requisite to permit the sale or other disposition by the
holder of such Restricted Stock so registered. In the event that any
registration pursuant to this Section 6.04 shall be, in whole or in part, an
underwritten public offering of Common Stock, the number of shares of Restricted
Stock to be included in such an underwriting may be reduced (pro rata among the
requesting holders based upon the number of shares of Restricted Stock owned by
such holders) if and to the extent that the managing underwriter shall be of the
opinion that such inclusion would adversely affect the marketing of the
securities to be sold by the Company therein; provided, however, that such
                                              --------  -------
number of shares of Restricted Stock shall not be reduced if any shares are to
be included in such underwriting for the account of any person other than the
Company or requesting holders of Restricted Stock. Notwithstanding the foregoing
provisions, the Company may withdraw any registration statement referred to in
this Section 6.04 without thereby incurring any liability to the holders of
Restricted Stock. There shall be no limit to the number of registrations of
Restricted Stock which may be effected under this Section 6.04.

          SECTION 6.05. Registration on Form S-3. If at any time (a) a holder or
                        ------------------------                             
holders of 17.5% of the shares of Restricted Stock request that the Company file
a registration statement on Form S-3 or any successor thereto for a public
offering of all or any portion of the shares of Restricted Stock held by such
requesting holder or holders, the reasonably anticipated aggregate price to the
public of which would exceed $1,000,000, and (b) the Company is a registrant
entitled to use Form S-3 or any successor thereto to register such shares, then
the Company shall use its best efforts to register under the Securities Act on
Form S-3 or any successor thereto, for public sale in accordance with the method
of disposition specified in such notice, the number of shares of Restricted
Stock specified in such notice. Whenever the Company is required by this Section
6.05 to use its best efforts to effect the registration of Restricted Stock,
each of the procedures and requirements of Section 6.03 (including but not
limited to the requirement that the Company notify all holders of Restricted
Stock from whom notice has not been received and provide them with the
opportunity to participate in the offering) shall apply to such registration,
provided, however, the Company shall not be required to effect more than five
- --------  -------
registrations on Form S-3 which may be requested and obtained under this Section
6.05, and provided, further, however that the requirements contained in the 
          --------  -------  -------
first sentence of Section 6.03(a) shall not apply to any registration on Form S-
3 which may be requested and obtained under this Section 6.05.

          SECTION 6.06. Registration Procedures. If and whenever the Company is
                        -----------------------
required by the provisions of Sections 6.03, 6.04 or 6.05 to use its best
efforts to effect the registration of any shares of Restricted Stock under the
Securities Act, the Company will, as expeditiously as possible:

          (a)  prepare and file with the Commission a registration statement
     (which, in the case of an underwritten public offering pursuant to Section
     6.03, shall be on Form S-1 or other form of general applicability
     satisfactory to the managing underwriter selected as therein provided) with
     respect to such securities;
<PAGE>
 
                                                                              36
 
          (b)  prepare and file with the Commission such amendments and
     supplements to such registration statement and the prospectus used in
     connection therewith as may be necessary to keep such registration
     statement effective for the period specified in paragraph (i) below and
     comply with the provisions of the Securities Act with respect to the
     disposition of all Restricted Stock covered by such registration statement
     in accordance with the sellers' intended method of disposition set forth in
     such registration statement for such period;

          (c)  furnish to each seller of Restricted Stock and to each
     underwriter such number of copies of the registration statement and the
     prospectus included therein (including each preliminary prospectus) as such
     persons reasonably may request in order to facilitate the public sale or
     other disposition of the Restricted Stock covered by such registration
     statement;

          (d)  use its best efforts to register or qualify the Restricted Stock
     covered by such registration statement under the securities or "blue sky"
     laws of such jurisdictions as the sellers of Restricted Stock or, in the
     case of an underwritten public offering, the managing underwriter
     reasonably shall request; provided, however, that the Company shall not for
                               --------  -------
     any such purpose be required to qualify generally to transact business as a
     foreign corporation in any jurisdiction where it is not so qualified or to
     consent to general service of process in any such jurisdiction;

          (e)  use its best efforts to list the Restricted Stock covered by such
     registration statement with any securities exchange or market on which the
     Common Stock of the Company is then listed or quoted;

          (f)  immediately notify each seller of Restricted Stock and each
     underwriter under such registration statement, at any time when a
     prospectus relating thereto is required to be delivered under the
     Securities Act, of the happening of any event of which the Company has
     knowledge as a result of which the prospectus contained in such
     registration statement, as then in effect, includes an untrue statement of
     a material fact or omits to state a material fact required to be stated
     therein or necessary to make the statements therein not misleading in light
     of the circumstances then existing;

          (g)  if the offering is underwritten and at the request of any seller
     of Restricted Stock, use its best efforts to furnish on the date that
     Restricted Stock is delivered to the underwriters for sale pursuant to such
     registration: (i) an opinion dated such date of counsel representing the
     Company for the purposes of such registration, addressed to the
     underwriters and to such seller, stating that such registration statement
     has become effective under the Securities Act and that (A) to the best
     knowledge of such counsel, no stop order suspending the effectiveness
     thereof has been issued and no proceedings for that purpose have been
     instituted or are pending or contemplated under the Securities Act, (B) the
     registration statement, the related prospectus and each amendment or
     supplement thereof comply as to form in all material respects with the
     requirements of the Securities Act (except that such counsel need not
     express any opinion as to financial statements contained therein) and (C)
     to such other effects as reasonably may be requested by counsel for the
     underwriters or by such seller or its counsel and (ii) a letter dated such
     date from the independent public accountants retained by the Company,
     addressed to the underwriters and to such seller stating that they

<PAGE>
 
                                                                              37

     are independent public accountants within the meaning of the Securities Act
     and that, in the opinion of such accountants, the financial statements of
     the Company included in the registration statement or the prospectus, or
     any amendment or supplement thereof, comply as to form in all material
     respects with the applicable accounting requirements of the Securities Act,
     and such letter shall additionally cover such other financial matters
     (including information as to the period ending no more than five business
     days prior to the date of such letter) with respect to such registration as
     such underwriters reasonably may request;

          (h)  make available for inspection by each seller of Restricted Stock,
     any underwriter participating in any distribution pursuant to such
     registration statement, and any attorney, accountant or other agent
     retained by such seller or underwriter, all financial and other records,
     pertinent corporate documents and properties of the Company, and cause the
     Company's officers, directors and employees to supply all information
     reasonably requested by any such seller, underwriter, attorney, accountant
     or agent in connection with such registration statement; and

          (i)  with respect to any registration statement filed by the Company
     pursuant to Section 6.03 or 6.05 or any registration statement pursuant to
     which Restricted Shares are to be sold pursuant to Section 6.04, the
     Company shall use its best efforts to cause such registration statement to
     become and remain effective for 180 days.

          In connection with each registration hereunder, the sellers of
Restricted Stock will furnish to the Company in writing such information with
respect to themselves and the proposed distribution by them as shall be
reasonably necessary in order to assure compliance with Federal and applicable
state securities laws.

          In connection with each registration pursuant to Sections 6.03, 6.04
or 6.05 covering an underwritten public offering, the Company and each seller
agree to enter into a written agreement with the managing underwriter selected
in the manner herein provided in such form and containing such provisions as are
customary in the securities business for such an arrangement between such
underwriter and companies of the Company's size and investment stature.

          SECTION 6.07. Expenses. All expenses incurred by the Company in 
                        --------                                                
complying with Sections 6.03, 6.04 or 6.05, including, without limitation, all
registration and filing fees, printing expenses, fees and disbursements of
counsel and independent public accountants for the Company, fees and expenses
(including counsel fees) incurred in connection with complying with state
securities or "blue sky" laws, fees of the National Association of Securities
Dealers, Inc., transfer taxes, fees of transfer agents and registrars, costs of
insurance and fees and disbursements of one counsel for the sellers of
Restricted Stock, but excluding any Selling Expenses, are called "Registration
                                                                  ------------
Expenses". All underwriting discounts and selling commissions applicable to the
- --------
sale of Restricted Stock are called "Selling Expenses".
                                     ---------------- 

          The Company will pay all Registration Expenses in connection with each
registration statement under Sections 6.03, 6.04 or 6.05. All Selling Expenses
in connection with each registration statement under Sections 6.03, 6.04 or
6.05, shall be borne by the participating sellers in proportion to the number of
shares sold by each, or by
<PAGE>
 
                                                                              38

such participating sellers other than the Company (except to the extent the
Company shall be a seller) as they may agree.

     SECTION 6.08. Indemnification and Contribution. (a) In the event of a
                   --------------------------------                       
registration of any of the Restricted Stock under the Securities Act pursuant to
Sections 6.03, 6.04 or 6.05, the Company will indemnify and hold harmless each
seller of such Restricted Stock thereunder, each underwriter of such Restricted
Stock thereunder and each other person, if any, who controls such seller or
underwriter within the meaning of the Securities Act, against any losses,
claims, damages or liabilities, joint or several, to which such seller,
underwriter or controlling person may become subject under the Securities Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect thereof) arise our of or are based upon any untrue statement or alleged
untrue statement of any material fact contained in any registration statement
under which such Restricted Stock was registered under the Securities Act
pursuant to Sections 6.03, 6.04 or 6.05, any preliminary prospectus or final
prospectus contained therein, or any amendment or supplement thereof, or arise
out of or are based upon the omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading, and will reimburse each such seller, each such
underwriter and each such controlling person for any legal or other expenses
reasonably incurred by them in connection with investigating or defending any
such loss, claim, damage, liability or action; provided however, that the 
                                               -------- -------          
Company will not be liable in any such case if and to the extent that any such
loss, claim, damage or liability arises out of or is based upon an untrue
statement or alleged untrue statement or omission or alleged omission so made in
conformity with information furnished by any such seller, any such underwriter
or any such controlling person in writing specifically for use in such
registration statement or prospectus.

          (b)  In the event of a registration of any of the Restricted Stock
under the Securities Act pursuant to Sections 6.03, 6.04 or 6.05, each seller of
such Restricted Stock thereunder, severally and not jointly, will indemnify and
hold harmless the Company, each person, if any, who controls the Company within
the meaning of the Securities Act, each officer of the Company who signs the
registration statement, each director of the Company, each underwriter and each
person who controls any underwriter within the meaning of the Securities Act,
against all losses, claims, damages or liabilities, joint or several, to which
the Company or such officer, director, underwriter or controlling person may
become subject under the Securities Act or otherwise, insofar as such losses,
claims, damages or liabilities (or actions in respect thereof) arise out of or
are based upon any untrue statement or alleged untrue statement of any material
fact contained in the registration statement under which such Restricted Stock
was registered under the Securities Act pursuant to Sections 6.03, 6.04 or 6.05,
any preliminary prospectus or final prospectus contained therein, or any
amendment or supplement thereof, or arise out of or are based upon the omission
or alleged omission to state therein a material fact required to be stated
therein or necessary to make the statements therein not misleading, and will
reimburse the Company and each such officer, director, underwriter and
controlling person for any legal or other expenses reasonably incurred by them
in connection with investigating or defending any such loss, claim, damage,
liability or action; provided, however, that such seller will be liable
                     --------  -------
hereunder in any such case if and only to the extent that any such loss, claim,
damage or liability arises out of or is based upon an untrue statement or
alleged untrue statement or omission or alleged omission made in reliance upon
and in conformity with information pertaining to such seller, as such, furnished
in writing to the Company by such seller specifically for use in such
registration statement or
 
<PAGE>
 
                                                                              39

prospectus; and provided further, however, that the liability of each seller
                ----------------  -------
hereunder shall be limited to the proportion of any such loss, claim, damage,
liability or expense which is equal to the proportion that the public offering
price of the shares sold by such seller under such registration statement bears
to the total public offering price of all securities sold thereunder, but not in
any event to exceed the proceeds received by such seller from the sale of
Restricted Stock covered by such registration statement.

          (c)  Promptly after receipt by an indemnified party hereunder of
notice of the commencement of any action, such indemnified party shall, if a
claim in respect thereof is to be made against the indemnifying party hereunder,
notify the indemnifying party in writing thereof, but the omission so to notify
the indemnifying party shall not relieve it from any liability which it may have
to such indemnified party other than under this Section 6.08 and shall only
relieve it from any liability which it may have to such indemnified party under
this Section 6.08 if and to the extent the indemnifying party is prejudiced by
such omission. In case any such action shall be brought against any indemnified
party and it shall notify the indemnifying party of the commencement thereof,
the indemnifying party shall be entitled to participate in and, to the extent it
shall wish, to assume and undertake the defense thereof with counsel
satisfactory to such indemnified party, and, after notice from the indemnifying
party to such indemnified party of its election so to assume and undertake the
defense thereof, the indemnifying party shall not be liable to such indemnified
party under this Section 6.08 for any legal expenses subsequently incurred by
such indemnified party in connection with the defense thereof other than
reasonable costs of investigation and of liaison with counsel so selected;
provided, however, that, if the defendants in any such action include both the
- --------- -------                                                             
indemnified party and the indemnifying party and the indemnified party shall
have reasonably concluded that there may be reasonable defenses available to it
which are different from or additional to those available to the indemnifying
party or if the interests of the indemnified party reasonably may be deemed to
conflict with the interests of the indemnifying party, the indemnified party
shall have the right to select a separate counsel and to assume such legal
defenses and otherwise to participate in the defense of such action, with the
expenses and fees of such separate counsel and other expenses related to such
participation to be reimbursed by the indemnifying party as incurred.

          (d)  In order to provide for just and equitable contribution to joint
liability under the Securities Act in any case in which either (i) any
indemnified party exercising rights under this Agreement, or any controlling
person of any such holder, makes a claim for indemnification pursuant to this
Section 6.08 but it is judicially determined (by the entry of a final judgment
or decree by a court of competent jurisdiction and the expiration of time to
appeal or the denial of the last right of appeal) that such indemnification may
not be enforced in such case notwithstanding the fact that this Section 6.08
provides for indemnification in such case, or (ii) contribution under the
Securities Act may be required on the part of any such selling holder or any
such controlling person in circumstances for which indemnification is provided
under this Section 6.08; then, and in each such case, the Company and such
holder will contribute to the aggregate losses, claims, damages or liabilities
to which they may be subject (after contribution from others) in such proportion
so that each such person is responsible for the portion represented by the
percentage that the public offering price of the securities offered by such
person under the registration statement bears to the public offering price of
all securities offered by such registration statement, and the Company is
responsible for the remaining portion; provided, however, that, in any such
                                       --------  -------
case, (A) no person will be required to contribute any amount in excess of the
public offering price of all such Restricted Stock offered by it pursuant to
such
<PAGE>
 
                                                                              40

registration statement; and (B) no person or entity guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
will be entitled to contribution from any person or entity who was not guilty of
such fraudulent misrepresentation.

          SECTION 6.09. Changes in Common Stock. If, and as often as, there is
                        -----------------------                         
any change in the Common Stock or the Preferred Stock or by way of a stock
split, stock dividend, combination or reclassification, or through a merger,
consolidation, reorganization or recapitalization, or by any other means,
appropriate adjustment shall be made in the provisions hereof so that the rights
and privileges granted hereby shall continue with respect to the Common Stock or
the Preferred Stock as so changed.

          SECTION 6.10. Rule 144 Reporting. With a view to making available the
                        ------------------                                      
benefits of certain rules and regulations of the Commission which may at any
time permit the sale of the Restricted Stock to the public without registration,
at all times 90 days after any registration statement covering a public offering
of securities of the Company under the Securities Act shall have become
effective, the Company agrees to:

          (a)  make and keep public information available, as those terms are
     understood and defined in Rule 144 under the Securities Act;

          (b)  use its best efforts to file with the Commission in a timely
     manner all reports and other documents required of the Company under the
     Securities Act and the Exchange Act; and

          (c)  furnish to each holder of Restricted Stock forthwith upon request
     a written statement by the Company as to its compliance with the reporting
     requirements of such Rule 144 and of the Securities Act and the Exchange
     Act, a copy of the most recent annual or quarterly report of the Company,
     and such other reports and documents so filed by the Company as such holder
     may reasonably request in availing itself of any rule or regulation of the
     Commission allowing such holder to sell any Restricted Stock without
     registration.

          SECTION 6.11. Transferability of Registration Rights: Termination. 
                        --------------------------------------------------- 

     (a)  Registration rights conferred herein on the holders of Restricted
     Stock shall only inure to the benefit of a transferee of Restricted Stock
     if (i) there is transferred to such transferee at least 20% of the total
     shares of Restricted Stock originally issued to such Purchaser or to the
     direct or indirect transferor of such transferee or (ii) such transferee is
     a partner, shareholder or Affiliate of a party hereto.

          (b)  The obligations of the Company to register shares of Restricted
Stock under Sections 6.03, 6.04 or 6.05 shall terminate on the fifteenth
anniversary of the date of this Agreement.

          SECTION 6.12. Suspension of Registration Obligations. Notwithstanding
                        --------------------------------------             
provisions of Section 6.06(a), the Company's obligation to file a registration
statement, or cause such registration statement to become and remain effective
(a) may be suspended on one occasion for a period not to exceed 180 days if
there exists at the time material nonpublic information relating to the Company
which, in the reasonable opinion of the Company, should not be disclosed and (b)
shall not apply for the period which begins seven days prior to and ends 90 days
after the commencement of a public offering of the
<PAGE>
 
                                                                              41

Company's Common Stock, so long as the Company has fulfilled its notice
obligations under Section 6.04 with respect to such offering.

          SECTION 6.13.  Other Registration Rights. The Company shall not grant
                         -------------------------
to any third party any registration rights more favorable than or inconsistent
with any of those contained herein, so long as any of the registration rights
under this Agreement remain in effect.


                                  ARTICLE VII

                                 Miscellaneous
                                 -------------

          SECTION 7.01.  Term. Other than (a) Section 3.01(a), (c) and (e),
                         ----
which shall continue in effect for so long as the Crowns or their Crown Related
Transferees shall have in the aggregate a 5% or greater interest in the Common
Stock of the Company and (b) Article VI hereof, this Agreement shall terminate
immediately prior to the consummation of the first firm commitment underwritten
public offering pursuant to an effective registration statement on Form S-1 (or
its then equivalent) under the Securities Act, which offering has been approved
by a majority of the Board (including the approval of at least 66 2/3% of the
directors nominated by the holders of the Preferred Shares and the Nominating
Group, considered as a group).

          SECTION 7.02.  Failure to Deliver Shares. If a Stockholder becomes
                         -------------------------
obligated to sell any Shares to an Investor or the Company under this Agreement
and fails to deliver such Shares in accordance with the terms of this Agreement,
such Investor or the Company, as the case may be, at its option, in addition to
all other remedies such person may have, shall send to the Stockholder the
purchase price for such Shares as is herein specified. Thereupon, the Company
upon written notice to the Stockholder, (a) shall cancel on its books the
certificate or certificates representing the Shares to be sold and (b) shall
issue, in lieu thereof, in the name of such Investor or the Company, as the case
may be, a new certificate or certificates representing such Shares, and
thereupon all of the Stockholder's rights in and to such Shares shall terminate.

          SECTION 7.03.  Specific Enforcement. The Stockholders expressly agree
                         --------------------
that the Investors and the Company will be irreparably damaged if this Agreement
is not specifically enforced. Upon a breach or threatened breach of the terms,
covenants and/or conditions of this Agreement by a Stockholder, the Investors
and the Company shall, in addition to all other remedies, each be entitled to a
temporary or permanent injunction, without showing any actual damage, and/or a
decree for specific performance, in accordance with the provisions hereof

          SECTION 7.04.  Legend. In addition to any other legends provided for
                         ------
herein, each certificate evidencing any of the Shares or Preferred Shares shall
bear a legend substantially as follows:

          "The shares represented by this certificate are subject to all the
          terms and conditions of a certain Amended and Restated Stockholders
          Agreement dated as of August 14, 1997, a copy of which the Company
          will furnish to the holder of this certificate upon request and
          without charge. Such terms and conditions include restrictions on
          transfer and these shares may not be
<PAGE>
 
                                                                              42

          sold, exchanged, transferred, pledged, hypothecated or otherwise
          disposed of except in accordance with and subject to the terms of the
          Agreement."

          SECTION 7.05.  Notices. Notices given hereunder shall be deemed to
                         -------
have been duly given on the date of personal delivery, on the date of postmark
if mailed by certified or registered mail, return receipt requested, or on the
date sent by telecopier or telex to the party being notified at his/her or its
address specified below or such other address as the addressee may subsequently
notify the other parties of in writing. The addresses of the Company, the
Stockholders and the Investors are as follows:

     If to the Company:  Castle Tower Holding Corp.
                                510 Bering Drive, Suite 310
                                Houston, TX 77057
                                Fax: (713)974-1926
                                Attn: President

     with a copy to:     Brown, Parker & Leahy, L.L.P.
                                1200 Smith Street, Suite 3600
                                Houston, TX 77002
                                Fax: (713)654-1871
                                Attn: E. Blake Hawk, Esq.

                         Cravath, Swaine & Moore
                                Worldwide Plaza
                                825 Eighth Avenue
                                New York, NY 10019
                                Fax: (212)474-3700
                                Attn: Susan Webster, Esq.

     If to the Crowns:   Robert A. Crown
                         Barbara Crown
                                c/o Crown Communications
                                Penn Center West III
                                Suite 229
                                Pittsburgh, PA 15276
                                Fax: (412)788-0908

     with a copy to:     Kirkpatrick & Lockhart LLP
                                1500 Oliver Building
                                Pittsburgh, PA 15222
                                Fax: (412)355-6501
                                Attn: Charles J. Queenan, Jr., Esq.

     If to the Initial   
       Stockholders:     Edward C. Hutcheson, Jr. 
                                5599 San Felipe   
                                Suite 301         
                                Houston, TX 77056 
                                Fax: (713)993-4696 
<PAGE>
 
                                                                              43

                                Ted B. Miller, Jr.
                                510 Bering, Suite 310
                                Houston, TX 77056
                                Fax: (713) 974-1926


     If to any Investor: At the address of such Investor
                                listed on Schedule I

     with a copy to:     Hutchins, Wheeler & Dittmar  
                                101 Federal Street
                                Boston, MA 02110
                                Fax: (617) 951-1295
                                Attn: Harry A. Hanson III, Esq.

          SECTION 7.06.  Entire Agreement and Amendments. This Agreement
                         -------------------------------
constitutes the entire agreement of the parties with respect to the subject
matter hereof and neither this Agreement nor any provision hereof may be waived,
modified, amended or terminated except by a written agreement signed by the
parties hereto (other than as provided in Section 3.03); provided, however, that
                                                         --------  -------
(a) the Investment Parties owning at least 66 2/3% of the Shares owned by all
Investment Parties and (b) Initial Stockholders owning at least 66 2/3% of the
Shares owned by all Initial Stockholders may effect any such waiver,
modification, amendment or termination on behalf of all of the Investment
Parties or all of the Initial Stockholders, respectively, and provided further,
                                                              ----------------
that, without the consent of all parties to this Agreement who own Shares, no
amendment or addition to this Agreement may be made which (i) modifies this
Section 7.06 or (ii) would affect the holders of Shares in a disproportionate
manner (other than any disproportionate results which are due to a difference in
the relative stock ownership in the Company or due to provisions set forth in
the terms of the Preferred Stock set forth in the Company's Charter). To the
extent any term or other provision of any other indenture, agreement or
instrument by which any party hereto is bound conflicts with this Agreement,
this Agreement shall have precedence over such conflicting term or provision.
Notwithstanding anything to the contrary set forth herein, it is acknowledged
and agreed that the separate consent of the Initial Stockholders shall not be
required in connection with any amendment, modification or waiver of the
provisions of this Agreement which affects the holders of Preferred Shares,
Class B Common Stock and Class A Common Stock in a proportionate and similar
manner (except for disproportionate results which are due to differences in
relative stock or debt ownership of the Company or due to differences set forth
in the Company's Charter). Prompt notice of any such amendment or waiver shall
be given to any person who did not consent thereto.

          SECTION 7.07.  Governing Law; Successors and Assigns. This Agreement
                         -------------------------------------
shall be governed by the laws of the State of Delaware and shall be binding upon
the heirs, personal representatives, executors, administrators, successors and
assigns of the parties.

          SECtION 7.08.  Waivers. No waiver of any breach or default hereunder
                         -------
shall be considered valid unless in writing, and no such waiver shall be deemed
a waiver of any subsequent breach or default of the same or similar nature. 

<PAGE>
 
                                                                              44

          SECTION 7.09.  Severability. If any provision of this Agreement shall
                         ------------
be held to be illegal, invalid or unenforceable, such illegality, invalidity or
unenforceability shall attach only to such provision and shall not in any manner
affect or render illegal, invalid or unenforceable any other provision of this
Agreement, and this Agreement shall be carried out as if any such illegal,
invalid or unenforceable provision were not contained herein.

          SECTION 7.10.  Captions. Captions are for convenience only and are not
                         --------
deemed to be part of this Agreement.

          SECTION 7.11.  Continuation of Employment. Nothing in this Agreement
                         --------------------------
shall create an obligation on the Company or the Investors to continue the
Stockholders' employment with the Company (including an Affiliate or
Subsidiary).

          SECTION 7.12.  Counterparts. This Agreement may be executed in two or
                         ------------
more counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument. One or more counterparts
of this Agreement may be delivered via telecopier with the intention that they
shall have the same effect as an original counterpart hereof

          SECTION 7.13.  Parties in Interest. All representations, covenants and
                         -------------------
agreements contained in this Agreement by or on behalf of the Crowns shall bind
and inure to the benefit of any Crown Related Transferees whether so expressed
or not.

          SECTION 7.14.  Shares Owned by Affiliates. For the purpose of applying
                         --------------------------
all provisions of this Agreement which condition the receipt of information or
access to information or exercise of any rights upon ownership of a specified
number or percentage of shares, the shares owned of record by any Affiliate of a
Stockholder shall be deemed to be owned by such Stockholder.

          SECTION 7.15.  Effect on Prior Agreements. The Company and each of
                         --------------------------
the "Purchasers" (as defined in Article V of the Securities Purchase Agreement
dated February 14, 1997, relating to the purchase of the Series C Stock) by
their execution hereof has acknowledged his or its: (a) waiver of all notices
and rights of first refusal in connection with the issuance to the Crowns of the
Class B Stock of the Company pursuant to the Crown Purchase Agreement and the
issuance of the Senior Preferred Stock and Warrants pursuant to the Senior
Preferred Agreement; (b) consent to the transactions contemplated by the Crown
Purchase Agreement, the Senior Preferred Agreement and this Agreement; and (c)
agree that the covenants set forth in Article V hereof, the registration rights
as set forth in Article VI hereof and the provisions of Section 7.06 hereof
supersede and replace, in their entirety, the similar provisions set forth in
the Securities Purchase Agreements. All other terms and provisions of the
Securities Purchase Agreements not superseded and replaced hereby shall remain
in full force and effect in accordance with the terms and provisions thereof,

          SECTION 7.16.  Exculpation; Rights of Investors. Each holder of any
                         --------------------------------
issued or issuable Shares or any Preferred Shares shall have the absolute right
to exercise or refrain from exercising any rights that such holder may have by
reason of this Agreement, the Crown Purchase Agreement, the Senior Preferred
Agreement or the Charter (including, without limitation, the right to consent to
the waiver of any obligation of the Company under this Agreement, the Crown
Purchase Agreement, the Senior
 
<PAGE>
 
                                                                              45

Preferred Agreement or the Charter and to enter into an agreement with the 
Company for the purpose of amending or supplementing, in accordance with their 
respective terms, this Agreement, the Crown Purchase Agreement, the Senior 
Preferred Agreement or the Charter), and neither any such holder nor any of its 
controlling persons, officers, directors, partners, agents, or employees shall 
incur any liability to any other holder of Shares as a result of such holder's 
exercising or refraining from exercising any such right. Each Investor 
acknowledges to each other Investor that it is not relying upon any person, firm
or corporation, other than the Company and its officers and directors, in making
its investment or decision to invest in the Company.

                     [Signature Pages Follow Immediately]
<PAGE>
 
                  [Signature Page to Stockholders Agreement]

          IN WITNESS WHEREOF, this Agreement has been executed as of the date
and year first above written.

                                             COMPANY:

                                             CASTLE TOWER HOLDING CORP.

                                             By: /s/ David L. Ivy
                                                --------------------------------
                                             Print:  David L. Ivy
                                                   -----------------------------
                                             Title:  President
                                                   -----------------------------
                                             Address:  510 Bering Drive
                                                       Suite 310
                                                       Houston, Texas 77057
<PAGE>
 
                                        INVESTORS:                       
                                                                         
                                        CENTENNIAL FUND IV, L.P.         
                                             By:  Centennial Holdings IV, 
                                                  L.P., its General      
                                                  Partner                 
                                                                         
                                             By:  /s/ David C. Hull Jr.
                                                --------------------------------
                                             Print:  David C. Hull Jr.
                                                   -----------------------------
                                                       General Partner          

                                        CENTENNIAL FUND IV, L.P.         
                                             By:  Centennial Holdings IV, 
                                                  L.P., its General      
                                                  Partner                

                                             By:  /s/ David C. Hull Jr.
                                                --------------------------------
                                             Print:  David C. Hull Jr.
                                                   -----------------------------
                                                       General Partner          
<PAGE>
 
                              BERKSHIRE FUND III, a Limited Partnership         
                              By:  Third Berkshire Associates LP, its       
                              Sole General Partner                          
                                                                            
                                                                            
                              /s/ Garth H. Greimann                             
                              ------------------------------                
                              Garth H. Greimann                             
                              General Partner                               
                                                                            
                                                                            
                              BERKSHIRE FUND IV, a Limited Partnership     
                              By:  Fourth Berkshire Associates, LLC, its       
                              Sole General Partner                          
                                                                            
                                                                            
                              /s/ Garth H. Greimann                             
                              ------------------------------                
                              Garth H. Greimann                             
                              Managing Director                             
                                                                            
                                                                            
                              BERKSHIRE INVESTORS LLC.,                     
                                                                            
                              By: /s/ Garth H. Greimann                        
                                 ---------------------------                
                              Garth H. Greimann                             
                              Managing Director                             

<PAGE>
 
                                                 PNC VENTURE CORP.


                                                 By: /s/ David Hillerman
                                                    ----------------------------
                                                 Print: David Hillerman
                                                       -------------------------
                                                 Title: Executive Vice President
                                                       -------------------------
<PAGE>
 
                                     NASSAU CAPITAL PARTNERS II L.P.      
                                        By:    NASSAU CAPITAL L.L.C.    
                                           -----------------------------
                                             Its General Partner        
                                        
                                        
                                        By: /s/ Randall A. Hack
                                           -----------------------------
                                        Print:  RANDALL A. HACK         
                                              --------------------------
                                        Title:  MEMBER                  
                                              --------------------------
                                              
                                              
                                        NAS PARTNERS I L.L.C.                 
                                        
                                        By:  /s/ Randall A. Hack
                                           -----------------------------
                                        Print:  RANDALL A. HACK         
                                              --------------------------
                                        Title:  MEMBER                  
                                              --------------------------
<PAGE>
 
                                         FAY, RICHWHITE COMMUNICATIONS        
                                         LIMITED                              
                                                                              
                                         By: /s/ David Richwhite              
                                            --------------------------------- 
                                         Print:  DAVID RICHWHITE              
                                               ------------------------------ 
                                         Title:  PRINCIPAL                    
                                               ------------------------------  
<PAGE>
 
                                             NEW YORK LIFE INSURANCE
                                             COMPANY

                                             By:  /s/ Steven M. Benevento
                                                --------------------------------
                                             Print:  STEVEN M. BENEVENTO
                                                   -----------------------------
                                             Title:  INVESTMENT MANAGER
                                                   -----------------------------
<PAGE>
 
                                        AMERICAN HOME ASSURANCE              
                                        COMPANY                              
                                                                             
                                        By:  /s/ David B. Pinkerton
                                           ----------------------------------
                                        Print:  David B. Pinkerton           
                                              -------------------------------
                                        Title:  Vice President               
                                              ------------------------------- 
<PAGE>
 
                                        NORTHWESTERN MUTUAL LIFE             
                                        INSURANCE COMPANY                    
                                                                             
                                                                             
                                        By:  /s/ A. Kipp Koester
                                           ---------------------------------- 
                                        Print:  A. KIPP KOESTER              
                                              -------------------------------
                                        Title:  VICE PRESIDENT               
                                              ------------------------------- 
<PAGE>
 
          By virture of his signature below, each of the undersigned hereby 
enters into this Agreement on the same terms and subject to the same conditions 
as the other Investors listed in Schedule I hereto; provided, however, that 
                                                    --------  -------
none of the undersigned shall be subject to, and each of the undersigned hereby
acknowledges that he shall not enjoy the benefits of, Article V hereof.


                                                       /s/ Win J. Neuger
                                                       ------------------------
                                                       Win J. Neuger

                                                       /s/ Peter F. Smith
                                                       ------------------------
                                                       Peter F. Smith

                                                       /s/ David B. Pinkerton
                                                       ------------------------
                                                       David B. Pinkerton
<PAGE>
 
                                                       /s/ J. Landis Martin
                                                       -----------------------
                                                       J. Landis Martin
<PAGE>
 
                                                       /s/ Robert F. McKenzie
                                                       -----------------------
                                                       Robert F. McKenzie
<PAGE>
 
                                        STOCKHOLDERS:                        
                                                                             
                                                                             
                                        /s/ Robert A. Crown 
                                        -------------------------------------
                                        Robert A. Crown                      
                                                                             
                                                                             
                                        /s/ Barbara Crown
                                        -------------------------------------
                                        Barbara Crown                        
                                                                             
                                                                             
                                        _____________________________________
                                        Edward C. Hutcheson, Jr.             
                                                                             
                                                                             
                                        _____________________________________
                                        Ted B. Miller, Jr.                    

<PAGE>
 
                                        STOCKHOLDERS:                        
                                                                  
                                                                  
                                        _____________________________________
                                        Robert A. Crown                      
                                                                  
                                                                   
                                        _____________________________________
                                        Barbara Crown                        
                                                                             
                                                                             
                                        /s/ Edward C. Hutcheson, Jr.
                                        -------------------------------------
                                        Edward C. Hutcheson, Jr.             
                                                                             
                                                                             
                                        _____________________________________
                                        Ted B. Miller, Jr.                    


<PAGE>
 
                                        STOCKHOLDERS:                        
                                                                             
                                                                             
                                        _____________________________________
                                        Robert A. Crown                      
                                                                             
                                                                             
                                        _____________________________________
                                        Barbara Crown                        
                                                                             
                                                                             
                                        _____________________________________
                                        Edward C. Hutcheson, Jr.             
                                                                             
                                                                             
                                        /s/ Ted B. Miller, Jr. 
                                        -------------------------------------
                                        Ted B. Miller, Jr.                    
<PAGE>
 
                                                                      SCHEDULE I
                                                     TO THE AMENDED AND RESTATED
                                                          STOCKHOLDERS AGREEMENT


Investors
- ---------

Centennial Fund IV, L.P.
Centennial Fund V, L.P.
Centennial Entrepreneurs Fund V, L.P.
  c/o Centennial Fund IV, L.P.
  1428 15th Street
  Denver, CO 80202

Berkshire Fund III, a Limited Partnership
Berkshire Fund IV, a Limited Partnership   
Berkshire Investors LLC
  c/o Berkshire Partners
  One Boston Place, 33rd Floor
  Boston, MA 02108

PNC Venture Corp.
  Fifth Avenue and Wood
  Pittsburgh, PA 15265

Nassau Capital Partners II L.P.
NAS Partners I L.L.C.
  c/o Nassau Capital LLC
  22 Chambers Street
  Princeton, NJ 08542

Fay, Richwhite Communications Limited
  Level 27, 151 Queen Street
  P.O. Box 1650
  Auckland
  NEW ZEALAND

New York Life Insurance Company
  51 Madison Avenue
  New York, NY 10010
  Attention: Investment Department
             Private Fiance Group
             Room 206
             Fax: (212) 447-4122

  with a copy of any notices regarding defaults or Events of
  Default under the operative documents to:

  Attention: Office of General Counsel
             Investment Section Room 1104
             Fax: (212) 576-8340

American Home Assurance Company
  175 Water Street, 24th Floor
  New York, NY 10038
  Attention: Peter F. Smith   
<PAGE>
 
                                                                               2

 
Northwestern Mutual Life Insurance Company
  720 East Wisconsin Avenue
  Milwaukee, Wisconsin 53202
  Attention: Securities Department

Win J. Neugar *
  AIG Global Investment Corp.
  175 Water Street
  24th Floor
  New York, NY 10038

Peter F. SMith *
  AIG Global Investment Corp.
  175 Water Street
  24th Floor
  New York, NY 10038

David B. Pinkerton *
  30 Canfield Road
  Convent Station, NJ 07960

J. Landis Martin
  150 Vine Street
  Denver, CO 80206

Robert F. Mckenzie
  1496 Bruce Creek Road
  P.O Box 1133
  Eagle, CO 81631

____________________

      *   Investor is not subject to, and is not entitled to the benefits of, 
Article V of the Agreement; provided, however, that such Investor shall be 
                            --------  -------  
included as a Purchaser for purposes of the definition of Restricted Stock and 
shall be subject to, and is entitled to the benefits of, Article VI of the 
Agreement.
<PAGE>
 
                                                                     SCHEDULE II
                                                     TO THE AMENDED AND RESTATED
                                                          STOCKHOLDERS AGREEMENT


None
<PAGE>
 
                                                                    SCHEDULE III
                                                     TO THE AMENDED AND RESTATED
                                                          STOCKHOLDERS AGREEMENT


Castle Tower Corporation                          TEA Group Incorporated 
- ------------------------                          ----------------------

Ted B. Miller, Jr.                                Ted B. Miller, Jr.
Edward C. Hutcheson, Jr.                          David L. Ivy
Carl Ferenbach                                    John L. Gwyn    
Garth H. Greimann                                 Bruce W. Neurohr  
Jeffrey H. Schutz                                 Charles H. Jones 
David C.Hull, Jr
Randall A. Hack
David L. Ivy
J. Landis Martin
Robert F. McKenzie
Robert A. Crown


TeleStructures, Inc.                              TeleShare, Inc.
- --------------------                              --------------- 
                                                 
Ted B. Miller, Jr.                                Ted B. Miller, Jr. 
David L. Ivy                                      David L. Ivy
John L. Gwyn                                      John L. Gwyn       
Bruce W. Neurohr  
Charles H. Jones 


Spectrum Site Management Corporation              Castle Tower Corporation (PR) 
- ------------------------------------              ----------------------------- 

Ted B. Miller, Jr.                                Ted B. Miller, Jr. 
David L. Ivy                                      David L. Ivy
John L. Gwyn                                      John L. Gwyn       


Crown Communications Inc.
- ------------------------

Ted B. Miller, Jr.
David L. Ivy
John L. Gwyn 
Robert A. Crown


<PAGE>
 
                                                                EXHIBIT 4.4

                                                                CONFORMED COPY



                       CASTLE TRANSMISSION (FINANCE) PLC
                                   as Issuer

                                      and

                     CASTLE TRANSMISSION INTERNATIONAL LTD
                                  as Guarantor

                                      and

                  CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD
                                  as Guarantor

                                      and

                   THE LAW DEBENTURE TRUST CORPORATION p.l.c.
                                   as Trustee



           ---------------------------------------------------------

                                   TRUST DEED
                                  relating to
           (Pounds)125,000,000 9 per cent. Guaranteed Bonds due 2007
                    (with authority to issue further bonds)

           ---------------------------------------------------------



                                  21 May 1997



                                Clifford Chance
                                     London
<PAGE>
 
                               TABLE OF CONTENTS



1.   Definitions and Interpretation..........................................  1

2.   Covenant to Repay.......................................................  5

3.   The Original Bonds......................................................  8

4.   Guarantee and Indemnity.................................................  8

5.   Covenant to comply with Trust Deed and Schedules........................ 10

6.   Covenants by the Issuer and the Guarantors.............................. 10

7.   Amendments.............................................................. 14

8.   Enforcement............................................................. 17

9.   Application of Moneys................................................... 17

10.  Terms of Appointment.................................................... 19

11.  Costs and Expenses...................................................... 23

12.  Appointment and Retirement.............................................. 26

13.  Notices................................................................. 27

14.  Law and Jurisdiction.................................................... 28

15.  Severability............................................................ 29

16.  Counterparts............................................................ 29

First Schedule............................................................... 30
     PART I
     Form of Original Temporary Global Bond.................................. 30
     PART II
     Form of Original Permanent Global Bond.................................. 39
<PAGE>
 
Second Schedule.............................................................. 44
         PART A
         Form of Definitive Original Bond.................................... 44
         PART B
         Terms and Conditions of the Bonds................................... 47

         PART C
         Form of Original Coupon............................................. 48

Third Schedule............................................................... 50
         Provisions for meetings of the Bondholders.......................... 50
<PAGE>
 
THIS TRUST DEED is made on 21 May 1997

BETWEEN:

(1)  CASTLE TRANSMISSION (FINANCE) PLC (the "Issuer");

(2)  CASTLE TRANSMISSION INTERNATIONAL LTD ("CTI") and CASTLE TRANSMISSION
     SERVICES (HOLDINGS) LTD (the "Company" and, together with CTI, the
     "Guarantors" and each severally a "Guarantor"); and

(3)  THE LAW DEBENTURE TRUST CORPORATION p.l.c. (the "Trustee", which expression
     includes, where the context admits, all persons for the time being the
     trustee or trustees of this Trust Deed).

WHEREAS-

(A)  The Issuer has authorised the creation and issue of (Pounds)125,000,000 in
     aggregate principal amount of 9 per cent. Guaranteed Bonds due 2007 to be
     constituted in relation to this Trust Deed.

(B)  The Guarantors have authorised the giving of the joint and several
     guarantee contained herein in relation to these Bonds.

(C)  The Trustee has agreed to act as trustee of this Trust Deed on the
     following terms and conditions.

NOW THIS DEED WITNESSES AND IT IS HEREBY DECLARED as follows:

1.   Definitions and Interpretation

1.1  Definitions:  In this Trust Deed the following expressions have the
following meanings

"Authorised Signatory" means:

(i)    in relation to the Issuer, any Director notified to the Trustee by any
       Director as being an Authorised Signatory pursuant to Clause 6.1(q)
       (Authorised Signatories); and

(ii)   in relation to either Guarantor, any Director of such Guarantor notified
       to the Trustee by any Director of the 

                                      -1-
<PAGE>
 
       Guarantor as being an Authorised Signatory pursuant to Clause 6.1(q)
       (Authorised Signatories);

"Bondholder" means an Original Bondholder or holder of Further Bonds;

"Bonds" means the Original Bonds and any Further Bonds save that in the First
and Second Schedules "Bonds" means the Original Bonds and any Further Bonds
forming a single issue therewith and the words "Coupons", "Bondholders" and
"Couponholders" where used therein shall be construed accordingly;

"British Islands" means the United Kingdom, the Channel Islands and the Isle of
Man;

"Cedel Bank" means Cedel Bank, societe anonyme;

"Conditions" means, in relation to the Original Bonds, the terms and conditions
to be endorsed on the Original Bonds, in the form or substantially in the form
set out in Part B of the Second Schedule, and, in relation to any Further Bonds,
the terms and conditions endorsed on the Bonds in accordance with the
supplemental deed relating to them, as any of the same may from time to time be
modified in accordance with this Trust Deed and any reference in this Trust Deed
to a particular numbered Condition shall be construed in relation to the
Original Bonds accordingly and any reference in this Trust Deed to a particular
numbered Condition in relation to any Further Bonds shall be construed as a
reference to the provision (if any) in the Conditions of such Further Bonds
which corresponds to the particular numbered Condition of the Original Bonds;

"Couponholder" means the holder of a Coupon;

"Coupons" means the bearer interest coupons appertaining to the Bonds or, as the
context may require, a specific number thereof and includes any replacement
Coupons issued pursuant to Condition 11;

"Director" means any director of the Issuer (or of a Guarantor, as applicable)
from time to time;

"Euroclear" means Morgan Guaranty Trust Company of New York, Brussels office, as
operator of the Euroclear System;

                                      -2-
<PAGE>
 
"Event of Default" means any of the events listed in Condition 9 (but in the
case of any of the events described in paragraphs (ii), (iii), (iv), (v),
(vi)(1), (vi)(3), (vi)(4), (viii) or (ix) thereof in relation to the Issuer, the
Guarantors or any Restricted Subsidiary (as the case may be) only if, pursuant
to the provisions of Condition 9, the Trustee has certified to the Issuer that
the relevant event is, in its opinion, materially prejudicial to the interests
of the Bondholders and, at its discretion or, if so required by holders of at
least one-fifth in principal amount of the outstanding Bonds or if so directed
by an Extraordinary Resolution, the Trustee has given written notice to the
Issuer declaring the Bonds to be immediately due and payable);

"Extraordinary Resolution" has the meaning set out in the Third Schedule;

"Further Bonds" means any bonds or notes of the Issuer constituted in relation
to a deed supplemental to this Principal Trust Deed pursuant to Clause 2.3
(Further Issues) and for the time being outstanding or, as the context may
require, a specific number thereof and includes any global bond, note or
evidence of indebtedness which has not for the time being been exchanged for
such bonds or notes and any replacement bonds or notes issued pursuant to
Condition 11;

"Global Bond" means the Original Temporary Global Bond and Original Permanent
Global Bond and any other global bonds representing the Further Bonds or any of
them;

"Original Bondholder" and (in relation to a Bond) "holder" means the bearer of
an Original Bond;

"Original Bonds" means the bearer bonds in the denominations of (Pounds)10,000
and (Pounds)100,000 comprising the (Pounds)125,000,000 9 per cent. Guaranteed
Bonds due 2007 constituted in relation to this Trust Deed, in or substantially
in the form set out in the First and Second Schedules, and for the time being
outstanding or, as the case may be, a specific number thereof and includes any
replacement Original Bonds issued pursuant to Condition 11 and (except for the
purposes of Clause 3.1 (Global Bonds) and 3.3 (Signature)) the Original Global
Bond for so long as it has not been exchanged in accordance with the terms
thereof;

                                      -3-
<PAGE>
 
"Original Coupons" means the bearer interest coupons in or substantially in the
form set out in Part C of the Second Schedule appertaining to the Original Bonds
and for the time being outstanding or as the context may require a specific
number thereof and includes any replacement Original Coupons issued pursuant to
Condition 11;

"Original Couponholder" and (in relation to a Coupon) "holder" means the bearer
of an Original Coupon;

"Original Definitive Bonds" means any Definitive Bonds which have been issued
pursuant to the Conditions relating to the Original Bonds;

"Original Global Bond" means the Original Temporary Global Bond and the Original
Permanent Global Bond for so long as they have not been exchanged in accordance
with the terms thereof.

"Original Permanent Global Bond" means the Original Permanent Global Bond to be
issued pursuant to Clause 3.1 (Global Bonds) in the form or substantially in the
form set out in Part II of the First Schedule;

"Original Temporary Global Bond" means the Original Temporary Global Bond to be
issued pursuant to Clause 3.1 (Global Bonds) in the form or substantially in the
form set out in Part I of the First Schedule;

"outstanding" has the meaning set out in the Conditions as modified by the
proviso set out in Clause 6.1(h);

"Paying Agency Agreement" means, in relation to the Bonds of any relevant
series, the agreement appointing the initial Paying Agents in relation to such
Bonds and any other agreement for the time being in force appointing Successor
paying agents in relation to such Bonds, together with any agreement for the
time being in force amending or modifying with the prior written approval of the
Trustee any of the aforesaid agreements in relation to such Bonds;

"Paying Agents" means, in relation to the Bonds of any relevant series the
several institutions (including, where the context permits, the Principal Paying
Agent) at their respective specified offices initially appointed pursuant to the
relative Paying Agency Agreement 

                                      -4-
<PAGE>
 
Agreement and/or, if applicable, any Successor paying agents, in relation to
such Bonds at their respective specified offices;

"Permanent Global Bond" means the Original Permanent Global Bond and any other
permanent global instrument representing the Further Bonds (or any of them;)

"Principal Paying Agent" means, in relation to the Bonds of any series, the
institution at its specified office initially appointed as principal paying
agent in relation to such Bonds pursuant to the relative Paying Agency Agreement
or, if applicable, any Successor principal paying agent in relation to such
Bonds at its specified office;

"Principal Trust Deed" means the Trust Deed constituting the Original Bonds;

"Repay" shall include "redeem" and vice versa and "repaid", "repayable" and
"repayment" and "redeemed", "redeemable" and "redemption" shall be construed
accordingly;

"specified office" means, in relation to any Paying Agent, either the office
identified with its name in the Conditions of the Bonds of the relevant series
or any other office notified to any relevant parties pursuant to the Paying
Agency Agreement;

"Successor" means, in relation to the Paying Agents, such other or further
person, as may from time to time be appointed as a Paying Agent pursuant to the
Paying Agency Agreement;

"Temporary Global Bond" means the Original Temporary Global Bond and any other
temporary global instrument representing the Further Bonds or any of them;

"this Trust Deed" means this Principal Trust Deed and the Schedules (as from
time to time modified in accordance with the provisions contained herein) and
(unless the context requires otherwise) includes any deed or other document
executed in accordance with the provisions hereof (as from time to time modified
as aforesaid) and expressed to be supplemental hereto;

"U.K. GAAP" means generally accepted accounting principles in the United
Kingdom; and

                                      -5-
<PAGE>
 
"Written Resolution" means a resolution in writing signed by or on behalf of all
holders of Bonds who for the time being are entitled to receive notice of a
meeting in accordance with the provisions of this Trust Deed whether contained
in one document or several documents in like form, each signed by or on behalf
of one or more such holders of the Bonds.

Words denoting the masculine gender shall include the feminine gender also,
words denoting persons only shall include companies, corporations and
partnerships and words importing the singular number only shall include the
plural and in each case vice versa.

1.2  In this Trust Deed references to:

(a)  Statutory modification:  any provision of any statute shall be deemed also
     to refer to any statutory modification or re-enactment thereof or any
     statutory instrument, order or regulation made thereunder or under such
     modification or re-enactment;

(b)  Additional amounts:  principal and/or interest in respect of the Bonds
     shall be deemed also to include references to any additional amounts which
     may be payable under Condition 8;

(c)  Tax:  costs, charges or expenses shall include any value added tax or
     similar tax charged or chargeable in respect thereof;

(d)  Currency:  "Sterling and "(Pounds)" shall denote the lawful currency for
     the time being of the United Kingdom;

(e)  Enforcement of rights:  an action, remedy or method of judicial proceedings
     for the enforcement of rights of creditors shall include, in respect of any
     jurisdiction other than England, references to such action, remedy or
     method of judicial proceedings for the enforcement of rights of creditors
     available or appropriate in such jurisdictions as shall most nearly
     approximate thereto;

(f)  Clauses and Schedules:  any reference in this Trust Deed to a Schedule or a
     Clause, paragraph or sub-paragraph is, unless otherwise stated, to a
     schedule hereto or a clause, paragraph or sub-paragraph hereof
     respectively;

                                      -6-
<PAGE>
 
(g)  Principal:  references to principal shall, when applicable, include premium
     or any other amount payable on an early redemption;

(h)  Clearing systems:  means Euroclear and/or Cedel Bank; and

(i)  Trust Corporation: means a corporation entitled by rules made under the
     Public Trustee Act, 1906 of Great Britain (or any successor statute or re-
     enactment thereof) to act as a custodian trustee or entitled pursuant to
     any other legislation applicable to a trustee in any jurisdiction other
     than England to act as trustee and carry on trust business under the laws
     of the country of its incorporation.

1.3  The Conditions:  In this Trust Deed, unless the context requires or the
same are otherwise defined, words and expressions defined in the Conditions and
not otherwise defined herein shall have the same meaning in this Trust Deed.

1.4  Headings:  The headings and sub-headings are for ease of reference only and
shall not affect the construction of this Trust Deed.

1.5  The Schedules:  The schedules are part of this Trust Deed and shall have
effect accordingly.

2.   Covenant to Repay

2.1  Covenant to Repay:  The Issuer covenants with the Trustee that it will, as
and when the Original Bonds or any of them become due to be redeemed or any
principal on the Original Bonds or any of them becomes due to be repaid in
accordance with the Conditions, unconditionally pay or procure to be paid to or
to the order of the Trustee in Sterling in London in immediately available
freely transferable funds the principal amount of the Original Bonds or any of
them becoming due for redemption or repayment on that date and shall (subject to
the provisions of the Conditions) until all such payments (after as well as
before any judgment or other order of any court of competent jurisdiction) are
duly made unconditionally pay or procure to be paid to or to the order of the
Trustee as aforesaid on the dates provided for in the Conditions interest on the
principal amount of the Original Bonds or any of them outstanding from time to
time as set out in the Conditions provided that:

                                      -7-
<PAGE>
 
(a)  every payment of principal or interest in respect of the Original Bonds or
     any of them made to the Principal Paying Agent in the manner provided in
     the Paying Agency Agreement shall satisfy, to the extent of such payment,
     the relevant covenant by the Issuer contained in this Clause except to the
     extent that there is default in the subsequent payment thereof to the
     Original Bondholders or Original Couponholders (as the case may be) in
     accordance with the Conditions;

(b)  if any payment of principal or interest in respect of the Original Bonds or
     any of them is made after the due date, payment shall be deemed not to have
     been made until either the full amount is paid to the Original Bondholders
     or Original Couponholders or, if earlier, the seventh day after notice has
     been given to the Original Bondholders in accordance with the Conditions
     that the full amount has been received by the Principal Paying Agent or the
     Trustee except, in the case of payment to the Principal Paying Agent, to
     the extent that there is failure in the subsequent payment to the Original
     Bondholders or Original Couponholders under the Conditions; and

(c)  in any case where payment of the whole or any part of the principal amount
     due in respect of any Original Bond is improperly withheld or refused upon
     due presentation (if so provided for in the Paying Agency Agreement) of the
     Original Bond, interest shall accrue on the whole or such part of such
     principal amount from the date of such withholding or refusal until the
     date either on which such principal amount due is paid to the Original
     Bondholders or, if earlier, the seventh day after which notice is given to
     the Original Bondholders in accordance with the Conditions that the full
     amount payable in respect of the said principal amount is available for
     collection by the Original Bondholders provided that on further due
     presentation thereof (if so provided for in the Paying Agency Agreement)
     such payment is in fact made.

The Trustee will hold the benefit of this covenant and the covenant in Clause 5
(Covenant to comply with the Trust Deed and Schedules) on trust for the Original
Bondholders and Original Couponholders.

2.2  Following an Event of Default:  At any time after (x) any Event of Default
shall have occurred and is continuing and shall not have been waived by the
Trustee or remedied to its satisfaction  

                                      -8-
<PAGE>
 
or (y) any Potential Event of Default shall have occurred and is continuing and
(save where such Potential Event of Default is a failure to pay any amount of
interest in respect of the Bonds on the due date for payment thereof) the
Trustee has certified to the Issuer that such Potential Event of Default is
materially prejudicial to the interests of the Bondholders, the Trustee may:

(a)  by notice in writing to the Issuer, the Guarantors, the Principal Paying
     Agent and the other Paying Agents require the Principal Paying Agent and
     the other Paying Agents or any of them:

     (i)  to act thereafter as Paying Agents of the Trustee under the provisions
          of this Trust Deed on the terms provided in the Paying Agency
          Agreement (with consequential amendments as necessary and save that
          the Trustee's liability under any provisions thereof for the
          indemnification, remuneration and payment of out-of-pocket expenses of
          the Paying Agents shall be limited to amounts for the time being held
          by the Trustee on the trusts of this Trust Deed in relation to the
          Bonds on the terms of this Trust Deed and available to the Trustee for
          such purpose) and thereafter to hold all Bonds, Coupons and all sums,
          documents and records held by them in respect of Bonds and Coupons on
          behalf of the Trustee; and/or

     (ii) to deliver up all Bonds and Coupons and all sums, documents and
          records held by them in respect of Bonds and Coupons to the Trustee or
          as the Trustee shall direct in such notice provided that such notice
          shall be deemed not to apply to any document or record which the
          relevant Paying Agent is obliged not to release by any law or
          regulation; and

(b)  by notice in writing to the Issuer and the Guarantors require them to make
     all subsequent payments in respect of Bonds and Coupons to or to the order
     of the Trustee and with effect from the issue of any such notice until such
     notice is withdrawn, proviso (a) to Clause 2.1 (Covenant to Repay) and (so
     far as it concerns payments by the Issuer or the Guarantors) Clause 9.4
     (Payments to Bondholders and Couponholders) shall cease to have effect.

2.3  Further Issues:

                                      -9-
<PAGE>
 
(a)  The Issuer shall be at liberty from time to time (but subject always to the
     provisions of this Trust Deed) without the consent of the Bondholders or
     the Couponholders to create and issue further bonds or debt securities
     howsoever designated either ranking pari passu in all respects (or in all
     respects save for the first payment of interest thereon) and so as to form
     a single series with the Original Bonds and/or Further Bonds of any series
     or upon such terms as to interest, conversion, redemption and otherwise as
     the Issuer may at the time of the issue thereof determine.

(b)  Any further bonds or debt securities howsoever designated created and
     issued pursuant to the provisions of paragraph (a) above shall, if they are
     to form a single series with the Original Bonds, and/or Further Bonds of
     any series, be constituted in relation to a deed supplemental to this Trust
     Deed and in any other case, if the Trustee so agrees, may be so
     constituted.  In any such case the Issuer and the Guarantors shall prior to
     the issue of any such further bonds or debt securities, execute and deliver
     to the Trustee a deed supplemental to this Trust Deed (if applicable, duly
     stamped or denoted) and containing a covenant by the Issuer in the form
     mutatis mutandis of Clause 2.1 (Covenant to Repay) of this Trust Deed in
     relation to the principal and interest in respect of such further bonds or
     debt securities howsoever designated and such other provisions
     (corresponding to any of the provisions contained in this Trust Deed) as
     the Trustee shall require.

(c)  A memorandum of every such supplemental deed shall be endorsed by the
     Trustee on this Principal Trust Deed and by the Issuer on the duplicate of
     this Trust Deed.

(d)  Any Further Bonds not forming a single series with the Original Bonds or
     any other series of Further Bonds shall form a separate series and
     accordingly, unless for any purpose the Trustee at its absolute discretion
     shall otherwise determine, all the provisions of this Trust Deed (other
     than Clauses 2.1 (Covenant to Repay), 3.1 (Global Bonds), 3.2 (The
     Definitive Bonds), 3.3 (Signature) and 6.2 (The Original Bonds) and the
     First and Second Schedules) shall apply separately to each series of the
     Bonds, and in this Trust Deed (other than such Clauses and Schedules) the
     expression "Bonds", "Bondholders", "Coupons" and "Couponholders" shall be
     construed accordingly.

                                      -10-
<PAGE>
 
3.   The Original Bonds

3.1  Global Bonds:  The Original Bonds will initially be represented by the
Original Temporary Global Bond in the principal amount of (Pounds)125,000,000.
Interests in the Original Temporary Global Bond shall be exchangeable, in
accordance with its terms, for interests in the Original Permanent Global Bond.
The Original Permanent Global Bond shall be exchangeable, in accordance with its
terms, for Original Bonds in definitive form.

3.2  The Definitive Bonds:  The Definitive Original Bonds and the Original
Coupons will be security printed in accordance with applicable legal and stock
exchange requirements substantially in the forms set out in the Second Schedule.
The Original Bonds will be endorsed with the Conditions.

3.3  Signature:  The Original Global Bonds, the Original Bonds and the Original
Coupons will be signed manually or in facsimile by a duly authorised person
designated by the Issuer and, in the case of the Original Global Bonds and the
Original Bonds will be authenticated manually by or on behalf of the Principal
Paying Agent.  The Issuer may use the facsimile signature of a person who at the
date of this Trust Deed is such a duly authorised person even if at the time of
issue of any Original Bonds and/or Original Coupons he no longer holds that
office.  Original Bonds and Original Coupons so executed and authenticated will
be binding and valid obligations of the Issuer.

3.4  Entitlement to treat holder as Owner:  The Issuer, the Guarantors, the
Trustee and any Paying Agent may deem and treat the holder of any Bond and any
Coupon appertaining to the relevant Bond  as the absolute owner of such Bond or
such Coupon as the case may be (whether or not such Bond or such Coupon shall be
overdue and notwithstanding any notation of ownership or other writing thereon
or any notice of previous loss or theft of such Bond or Coupon for all purposes
and, except as ordered by a court of competent jurisdiction or as required by
applicable law, the Issuer, the Guarantors, the Trustee and the Paying Agents
shall not be affected by any notice to the contrary.  All payments made to any
such holder shall be valid and, to the extent of the sums so paid, effective to
satisfy and discharge the liability for the moneys payable upon the Bonds and
Coupons.

4.   Guarantee and Indemnity

                                      -11-
<PAGE>
 
4.1  Guarantee:  Each Guarantor hereby unconditionally, irrevocably jointly and
severally guarantees to the Trustee payment of all sums expressed to be payable
by the Issuer under this Trust Deed or in respect of the Bonds or Coupons, as
and when the same becomes due and payable, whether at maturity, upon early
redemption, upon acceleration or otherwise, according to the terms of this Trust
Deed, the Bonds and the Coupons.  In case of the failure of the Issuer to pay
any such sum as and when the same shall become due and payable, the Guarantors
hereby jointly and severally agree to cause such payment to be made as and when
the same becomes due and payable, whether at maturity, upon early redemption,
upon acceleration or otherwise, as if such payment were made by the Issuer.
This Guarantee constitutes joint and several direct, general and unsubordinated
obligations of each Guarantor which will at all times rank at least pari passu
with all other present and future unsecured and unsubordinated obligations of
such Guarantor, save for such obligations as may be preferred by mandatory
provisions of applicable law.

4.2  Guarantors as principal debtors:  Each Guarantor jointly and severally
agrees, as an independent primary obligation, that it shall pay to the Trustee
on demand sums sufficient to indemnify the Trustee and each Bondholder and
Couponholder against any loss sustained by the Trustee or such Bondholder or
Couponholder by reason of the non-payment as and when the same shall become due
and payable of any sum expressed to be payable by the Issuer under this Trust
Deed or in respect of the Bonds, whether by reason of any of the obligations
expressed to be assumed by the Issuer in this Trust Deed or the Bonds being or
becoming void, voidable or unenforceable for any reason, whether or not known to
the Trustee or such Bondholder or Couponholder or for any other reason
whatsoever.

4.3  Unconditional payment:  If the Issuer defaults in the payment of any sum
expressed to be payable by the Issuer under this Trust Deed or in respect of the
Bonds or Coupons as and when the same shall become due and payable, the
Guarantors shall forthwith unconditionally pay or procure to be paid to or to
the order of the Trustee in Sterling in London in immediately available freely
transferable funds the amount in respect of which such default has been made;
provided that every payment of such amount made by the Guarantors to the
Principal Paying Agent in the manner provided in the Paying Agency Agreement
shall be deemed to cure pro tanto such default by the Issuer and shall be deemed
for the purposes of this Clause 4 to have been paid to or for the account of the
Trustee 

                                      -12-
<PAGE>
 
except to the extent that there is failure in the subsequent payment of such
amount to the Bondholders and Couponholders in accordance with the Conditions,
and everything so paid by the Guarantors in accordance with the Paying Agency
Agreement shall have the same effect as if it had been paid thereunder by the
Issuer.

4.4  Unconditional obligation:  Each Guarantor jointly and severally agrees that
its obligations hereunder shall be unconditional, irrespective of the validity,
regularity or enforceability of this Trust Deed or any Bond or Coupon, or any
change in or amendment hereto or thereto, the absence of any action to enforce
the same, any waiver or consent by any Bondholder or Couponholder or by the
Trustee with respect to any provision of this Trust Deed or the Bonds, the
obtaining of any judgment against the Issuer or any action to enforce the same
or any other circumstance which might otherwise constitute a legal or equitable
discharge or defence of a guarantor.

4.5  Guarantors' obligations continuing:  Each Guarantor waives diligence,
presentment, demand of payment, filing of claims with a court in the event of
merger or bankruptcy of the Issuer, any right to require a proceeding first
against the Issuer, protest or notice with respect to any Bond or the
indebtedness evidenced thereby and all demands whatsoever.  Each Guarantor
agrees that the guarantee and indemnity contained in this Clause 4 is a
continuing guarantee and indemnity and shall remain in full force and effect
until all amounts due as principal, interest or otherwise in respect of the
Bonds or under this Trust Deed shall have been paid in full and that the
Guarantors shall not be discharged by anything other than a complete performance
of the obligations contained in this Trust Deed and the Bonds.

4.6  Subrogation of Guarantors' rights:  The Guarantors shall be subrogated to
all rights of the Bondholders against the Issuer in respect of any amounts paid
by such Guarantor pursuant hereto; provided that the Guarantors shall not
without the consent of the Trustee be entitled to enforce, or to receive any
payments arising out of or based upon or prove in any insolvency or winding up
of the Issuer in respect of, such right of subrogation until such time as the
principal of and interest on all outstanding Bonds and all other amounts due
under this Trust Deed and the Bonds have been paid in full.  Furthermore, until
such time as aforesaid neither Guarantor shall take any security or counter-
indemnity from the 

                                      -13-
<PAGE>
 
Issuer in respect of their respective obligations under this Clause 4.

4.7  Repayment to the Issuer:  If any payment received by the Trustee or the
Principal Paying Agent pursuant to the provisions of this Trust Deed or the
Conditions shall, on the subsequent bankruptcy, insolvency, corporate
reorganisation or other similar event affecting the Issuer, be avoided, reduced,
invalidated or set aside under any laws relating to bankruptcy, insolvency,
corporate reorganisation or other similar events, such payment shall not be
considered as discharging or diminishing the liability of either of the
Guarantors whether as guarantor, principal debtor or indemnifier and the
guarantee and indemnity contained in this Clause 4 shall continue to apply as if
such payment had at all times remained owing by the Issuer and the Guarantors
shall, jointly and severally, indemnify and keep indemnified the Trustee and the
Bondholders on the terms of the guarantee and indemnity contained in this Clause
4.

4.8  Suspense account:  Any amount received or recovered by the Trustee (other
than as a result of a payment by the Issuer to the Trustee in accordance with
proviso (i) of Clause 2.2(a) (Following an Event of Default) or the Guarantors
in accordance with this Clause 4) in respect of any sum payable by the Issuer
under this Trust Deed or the Bonds or the Coupons may be placed in a suspense
account and kept there for so long as the Trustee thinks fit.

5.   Covenant to comply with Trust Deed and Schedules

The Issuer and each Guarantor hereby covenants with the Trustee to comply with
those provisions of this Trust Deed and the Conditions which are expressed to be
binding on it and to perform and observe the same.  The Bonds are subject to the
provisions contained in this Trust Deed, all of which shall be binding upon the
Issuer, the Guarantors, the Bondholders and the Couponholders and all persons
claiming through or under them respectively.

6.   Covenants by the Issuer and the Guarantors

6.1  The Bonds generally:  The Issuer and each Guarantor hereby covenants with
the Trustee that, so long as any of the Bonds remains outstanding, it will:

                                      -14-
<PAGE>
 
(a)  Books of account:  at all times keep and procure that all its Subsidiaries
     keep such books of account as may be necessary to comply with all
     applicable laws so as to enable the financial statements of the Issuer and
     each Guarantor to be prepared and allow the Trustee and any person
     appointed by the Trustee free access to the same at all reasonable times
     during normal business hours and to discuss the same with responsible
     officers of the Issuer or the Guarantors;

(b)  Event of Default: give notice in writing to the Trustee forthwith upon
     becoming aware of any Event of Default or Potential Event of Default and
     without waiting for the Trustee to take any further action;

(c)  Certificate of Directors:  provide to the Trustee within ten days of any
     request by the Trustee and at the time of the despatch to the Trustee of
     its annual financial statements referred to in paragraph (f) below and in
     any event not later than 180 days after the end of its financial year, in
     the case of the Company, an Officers' Certificate and, in the case of the
     Issuer and CTI, a certificate signed by two of its Directors, certifying to
     the best of their knowledge and belief, having made all reasonable
     enquiries, that up to a specified date not earlier than seven days prior to
     the date of such certificate (the "Certified Date") the Company, the Issuer
     or CTI, as the case may be, has complied with its obligations under this
     Trust Deed (or, if such is not the case, giving details of the
     circumstances of such non-compliance) and, in the case of the Issuer, that
     as at such date there did not exist nor had there existed at any time prior
     thereto since the Certified Date in respect of the previous such
     certificate delivered by it to the Trustee (or, in the case of the first
     such certificate, since the date of this Trust Deed) any Event of Default
     or Potential Event of Default or (if such is not the case) specifying the
     same;

(d)  Officers' Certificates:  in the case of the Company provide to the Trustee
     within ten days of any request by the Trustee in the context of any
     relevant transaction an Officers' Certificate setting out the Company's
     Consolidated Cash Flow, Consolidated Cash Flow Coverage Ratio, Consolidated
     Net Worth, Indebtedness and/or (as applicable) Total Interest during any
     relevant period or as at any date and/or (as applicable) particulars of any
     Restricted Payments, Net Cash Proceeds, 

                                      -15-
<PAGE>
 
     Asset Sales, the issue of any Capital Stock by CTI or any Restricted
     Subsidiary and any Charges over any assets of the Company or any Restricted
     Subsidiaries paid, received or effected during such period or as at such
     date in order to demonstrate compliance by the Company, the Issuer and CTI,
     as applicable, with any of the provisions of Conditions 3 and 4(a);

(e)  Certificate relating to Restricted and Unrestricted Subsidiaries:  in the
     case of the Company promptly upon the designation by its Board of Directors
     of any Unrestricted Subsidiary as a Restricted Subsidiary deliver to the
     Trustee a copy of the board resolution giving effect to such designation
     and an Officers' Certificate certifying that such designation complies with
     the provisions of Condition 18 relating to any such designation and provide
     to the Trustee, within ten days of any request by the Trustee and at the
     time of the despatch to the Trustee of its annual financial statements
     referred to in paragraph (f) below and in accordance with the Conditions,
     an Officers' Certificate identifying the Restricted and Unrestricted
     Subsidiaries of the Company up to a specified date not earlier than seven
     days prior to the date of such certificate.  Each Officers' Certificate
     must specify which of the Restricted Subsidiaries are companies organised
     and existing under the laws of the British Islands, the Republic of France,
     the Netherlands or the United States of America, any state thereof and the
     District of Columbia or any territory thereof, and any additions to or
     deletions from the previous such certificate;

(f)  Financial statements:  deliver to the Trustee and to the Principal Paying
     Agent (if the same are produced) as soon as practicable after their date of
     publication and in any event not more than 90 days following the end of
     each financial year, four copies of its audited annual financial statements
     and, (but in the case of the Issuer and CTI only if they have prepared the
     same) not more than 45 days following the end of each of its financial
     quarters, four copies of its unaudited consolidated (in the case of the
     Company) quarterly financial statements setting out in the case of the
     Company its consolidated turnover, operating income, net earnings,
     indebtedness and shareholders' equity.  In addition, within one week of the
     issue of any such financial statements of the Issuer or a Guarantor, the
     Issuer or such Guarantor shall 

                                      -16-
<PAGE>
 
     publish a notice in accordance with Condition 17 confirming that such
     statements are available for collection by Bondholders from the specified
     offices of the Paying Agents;

(g)  Information:  so far as permitted by applicable law and not prohibited by
     direction of Her Majesty's Government at all times give to the Trustee such
     information as it properly requires for the performance of its functions;

(h)  Bonds held by the Issuer or either of the Guarantors or their respective
     Subsidiaries:  send to the Trustee forthwith upon being so requested in
     writing by the Trustee a certificate of the Issuer or, as the case may be,
     either Guarantor (signed on its behalf by an Authorised Signatory) setting
     out the total number of Bonds of each series which at the date of such
     certificate are held by or for the benefit of it or any of its Subsidiaries
     it being agreed that for each of the following purposes, namely:

     (i)   the right to attend and vote at any meeting of Bondholders;

     (ii)  the determination of how many and which Bonds are for the time being
           outstanding for the purposes of Clauses 7.1 (Waiver) and 8.1
           (Institution of Legal Proceedings) and Conditions 9 and 13 and the
           Third Schedule; and

     (iii) any discretion, power or authority, whether contained in this Trust
           Deed or provided by law, which the Trustee is required to exercise in
           or by reference to the interests of the Bondholders or any of them

     those Bonds (if any) which are for the time being held by any person
     (including but not limited to the Issuer, either of the Guarantors, or any
     of their respective Subsidiaries, for the benefit of the Issuer, either of
     the Guarantors or any of their respective Subsidiaries) shall (unless and
     until ceasing to be so held) be deemed not to remain outstanding;

(i)  Execution of further documents:  so far as permitted by applicable law, at
     all times execute all such further documents and do all such further acts
     and things as may be necessary at any time or times in the reasonable
     opinion of 

                                      -17-
<PAGE>
 
     the Trustee to give effect to the provisions of this Trust Deed;

(j)  Notices to Bondholders:  send or procure to be sent to the Trustee prior to
     the date of publication the form of each notice to be given to the
     Bondholders with a view to obtaining the Trustee's prior written approval
     thereof (such approval not, unless so expressed, to constitute approval for
     the purposes of Section 57 of the Financial Services Act 1986 of the United
     Kingdom of any such notice which is an investment advertisement (as therein
     defined)) and, upon publication, two copies of each notice given to the
     Bondholders;

(k)  Notification of non-payment:  use its best endeavours to procure that the
     Principal Paying Agent notifies the Trustee forthwith in the event that it
     does not, on or before the due date for payment in respect of the Bonds or
     any of them or any of the Coupons, receive unconditionally the full amount
     in the relevant currency of the moneys payable on such due date on all such
     Bonds or Coupons;

(l)  Notification of late payment:  in the event of the unconditional payment to
     the Principal Paying Agent or the Trustee of any sum due in respect of the
     Bonds or any of them or any of the Coupons being made after the due date
     for payment thereof, forthwith give notice to the Bondholders that such
     payment has been made;

(m)  Notification of redemption or repayment:  not less than the number of days
     specified in the relevant Condition prior to the redemption or repayment
     date in respect of any Bond, give to the Trustee notice in writing of the
     amount of such redemption or repayment, pursuant to the Conditions;

(n)  Obligations of Paying Agents:  observe and comply with its obligations and
     use all reasonable endeavours to procure that the Paying Agents observe and
     comply with all their obligations under the Paying Agency Agreement and
     notify the Trustee immediately it becomes aware of any material breach or
     failure by a Paying Agent in relation to the Bonds or Coupons;

(o)  Change of taxing jurisdiction:  if the Issuer or either of the Guarantors
     shall become subject generally to the taxing jurisdiction of any territory
     or any political sub-division 

                                      -18-
<PAGE>
 
     thereof or any authority therein or thereof having power to tax, other than
     or in addition to the United Kingdom, then immediately upon becoming aware
     thereof the Issuer or, as the case may be, such Guarantor, shall notify the
     Trustee of such event and (unless the Trustee otherwise agrees) enter
     forthwith into a trust deed supplemental hereto, giving to the Trustee an
     undertaking or covenant in form and manner satisfactory to the Trustee in
     terms corresponding to the terms of Condition 8 with the substitution for
     (or, as the case may be, the addition to) the references therein to the
     United Kingdom of references to that other or additional territory to whose
     taxing jurisdiction, or that of a political subdivision thereof or an
     authority therein or thereof, the Issuer or such Guarantor shall have
     become subject as aforesaid, such trust deed also to modify Condition 8 so
     that such Condition shall make reference to that other or additional
     territory;

(p)  Listing:  at all times use all its best endeavours to maintain the listing
     of the Original Bonds on the Luxembourg Stock Exchange or, if it is unable
     to do so having used all reasonable endeavours or if the maintenance of
     such listing is agreed by the Trustee to be unduly burdensome or
     impractical, use its best endeavours to obtain and maintain a quotation or
     listing of the Original Bonds on such other stock exchange or exchanges or
     securities market or markets as the Issuer and the Guarantors may (with the
     approval of the Trustee) decide; and

(q)  Authorised Signatories:  upon the execution hereof and thereafter forthwith
     upon any change of the same, deliver to the Trustee (with a copy to the
     Principal Paying Agent) a list of the Authorised Signatories of the Issuer
     and the Guarantors, together with certified specimen signatures of the
     same.

6.2  The Original Bonds:  The Company and, to the extent set out therein, the
Issuer and CTI  hereby covenants with the Trustee to the effect set out in
Conditions 3 and 4 of the Original Bonds.

6.3  Release of Covenants:  Upon the repayment in full of the principal of the
Bonds and payment in full of all interest thereon the Company, CTI and the
Issuer will be released without any further act or formality from 

                                      -19-
<PAGE>
 
complying with the provisions of Conditions 3 and 4 and the provisions of
Clauses 6.1 (The Bonds generally) and 6.2 (The Original Bonds).

6.4  Covenant Defeasance:  In the event of:

     (a)  any of the Company, CTI or the Issuer giving written notice to the
          Trustee pursuant to Condition 4(b);

     (b)  any of the Company, CTI or the Issuer satisfying the conditions set
          out in paragraphs (i) to (vii) inclusive of Condition 4(b); and

     (c)  the depositor (as defined in Condition 4(b)) having executed such
          documents and done such acts and things as the Trustee shall require
          to constitute the security over the Defeasance Collateral,

then the Issuer and the Guarantors will be released from the covenants and
obligations set out in Conditions 3, 4(a) and 6(d), the Guarantee and the
covenants contained in paragraphs (c), (d), (e) and (f) of Clause 6.1 (The Bonds
generally) and paragraphs (ii), (iii), (iv), (vi) (1) and (4), (viii) and, to
the extent it relates thereto, (ix) of Condition 9 shall cease to apply as if
they had been deleted provided that if the Trustee is prevented from applying
all or any part of the Defeasance Collateral  in or towards payment of the
principal of or interest on the Bonds by virtue of any legal or insolvency
proceedings relating to the depositor then all of the above-mentioned provisions
of this Trust Deed, including the Guarantee, and the Conditions shall be
reinstated until such time as the Trustee ceases to be prevented from so
applying the Defeasance Collateral.

7.   Amendments

7.1  Waiver:  The Trustee may, without any consent or sanction of the
Bondholders or Couponholders and without prejudice to its rights in respect of
any subsequent breach, condition, event or act, from time to time and at any
time, but only if and in so far as in its opinion the interests of the
Bondholders shall not be materially prejudiced thereby, authorise or waive, on
such terms and conditions (if any) as shall seem expedient to it, any proposed
breach or breach of any of the covenants or provisions contained in 

                                      -20-
<PAGE>
 
this Trust Deed or the Bonds or Coupons or determine that any Event of Default
or Potential Event of Default shall not be treated as such for the purposes of
this Trust Deed; any such authorisation, waiver or determination shall be
binding on the Bondholders and the Couponholders and, unless the Trustee
otherwise agrees, the Issuer shall cause such authorisation, waiver or
determination to be notified to the Bondholders as soon as practicable
thereafter in accordance with the Conditions; provided that the Trustee shall
not exercise any powers conferred upon it by this Clause in contravention of any
express direction by an Extraordinary Resolution or of a request in writing made
by the holders of not less than 25 per cent. in aggregate principal amount of
the Bonds then outstanding (but so that no such direction or request shall
affect any authorisation, waiver or determination previously given or made) or
so as to authorise or waive any such proposed breach or breach relating to any
of the matters the subject of the Reserved Matters as specified and defined in
the Third Schedule.

7.2  Modifications:  The Trustee may from time to time and at any time without
any consent or sanction of the Bondholders or Couponholders concur with the
Issuer and the Guarantors in making (a) any modification to the Conditions or
this Trust Deed (other than in respect of Reserved Matters as specified and
defined in the Third Schedule or any provision of this Trust Deed referred to in
that specification) which in the opinion of the Trustee it may be proper to make
provided the Trustee is of the opinion that such modification will not be
materially prejudicial to the interests of the Bondholders or (b) any
modification to the Conditions or this Trust Deed if in the opinion of the
Trustee such modification is of a formal, minor or technical nature or made to
correct a manifest error.  Any such modification shall be binding on the
Bondholders and the Couponholders and, unless the Trustee otherwise agrees, the
Issuer shall cause such modification to be notified to the Bondholders as soon
as practicable thereafter in accordance with the Conditions.

7.3  Substitution:

(a)  By CTI or any of its Subsidiaries:  CTI or any Restricted Subsidiary (which
     for the purposes of  Condition 16(a) and this Clause 7.3(a) is any
     Restricted Subsidiary which is a company organised and existing under the
     laws of any of the British Islands, the Republic of France, the Netherlands
     or the United States of America, any state thereof, the District 

                                      -21-
<PAGE>
 
     of Columbia or any territory thereof) which is also a Subsidiary of CTI (a
     "Substitute Debtor") shall be entitled without the consent of the
     Bondholders or the Couponholders to assume the obligations of the Issuer in
     respect of the Bonds and under this Trust Deed upon:

     (i)  the execution of a supplemental trust deed by the Issuer, the
          Substitute Debtor, the Company and (if the Substitute Debtor is not
          CTI) CTI in form and substance satisfactory to the Trustee which
          includes, without limitation: (A) a covenant by the Substitute Debtor
          in favour of the Trustee to be bound by this Trust Deed as if it had
          been named therein as the Issuer; (B) if the Substitute Debtor is
          incorporated, domiciled or resident for tax purposes in a territory
          other than the United Kingdom, a covenant by the Substitute Debtor
          corresponding to the provisions of Condition 8 (but with reference to
          such territory as well as to the United Kingdom) and the provisions of
          Clause 6.1(o) of this Trust Deed; and (C) a covenant by the Company
          and (if the Substitute Debtor is not CTI) CTI in favour of the Trustee
          guaranteeing the obligations of the Substitute Debtor under and by
          virtue of such supplemental trust deed; and

     (ii) the delivery by the Issuer to the Trustee of an opinion of independent
          legal advisers of recognised standing acceptable to the Trustee in
          form and substance satisfactory to the Trustee to the effect that: (A)
          such supplemental trust deed constitutes legal, valid, binding and
          enforceable obligations of the Substitute Debtor, the Company and (if
          the Substitute Debtor is not CTI) CTI; (B) the Bonds constitute legal,
          valid, binding and enforceable obligations of the Substitute Debtor;
          (C) the Guarantee constitutes legal, valid, binding and enforceable
          obligations of the Company and (if the Substitute Debtor is not CTI)
          CTI in respect of all sums from time to time payable by the Substitute
          Debtor in respect of the Bonds; (D) the Substitute Debtor has obtained
          all governmental and regulatory approvals and consents necessary for
          its assumption of liability as principal debtor in respect of the
          Bonds and the Coupons in place of the Issuer; (E) the Company and (if
          the Substitute Debtor is not CTI) CTI have obtained all governmental
          and regulatory approvals and consents 

                                      -22-
<PAGE>
 
          necessary for the Guarantee to be a binding obligation; and (F) such
          approvals and consents are at the time of substitution in full force
          and effect;

(b)  By the Company or any of its other Subsidiaries:  the Company or any
     Restricted Subsidiary (which for the purposes of Condition 16(b) and this
     Clause 7.3(b) is any Restricted Subsidiary which is a company organised and
     existing under the laws of any of the British Islands, the Republic of
     France, the Netherlands or the United States of America, any state thereof,
     the District of Columbia or any territory thereof) which is not also CTI or
     a Subsidiary of CTI (an "Alternative Substitute Debtor") shall be entitled
     without the consent of the Bondholders or the Couponholders to assume the
     obligations of the Issuer in respect of the Bonds and under this Trust Deed
     upon:

     (i)  the execution of a supplemental trust deed by the Issuer, the
          Alternative Substitute Debtor, CTI and (if the Alternative Substitute
          Debtor is not the Company) the Company in form and substance
          satisfactory to the Trustee which includes, without limitation: (A) a
          covenant by the Alternative Substitute Debtor in favour of the Trustee
          to be bound by this Trust Deed as if it had been named therein as the
          Issuer; (B) if the Alternative Substitute Debtor is incorporated,
          domiciled or resident for tax purposes in a territory other than the
          United Kingdom, a covenant by the Alternative Substitute Debtor
          corresponding to the provisions of Condition 8 (but with reference to
          such territory as well as to the United Kingdom) and the provisions of
          Clause 6.1(o) (Change of Taxing Jurisdiction) hereof; and (C) a
          covenant by CTI and (if the Substitute Debtor is not the Company) the
          Company in favour of the Trustee guaranteeing the obligations of the
          Alternative Substitute Debtor under and by virtue of such supplemental
          trust deed;

     (ii) the delivery by the Issuer to the Trustee of an opinion of independent
          legal advisers of recognised standing acceptable to the Trustee in
          form and substance satisfactory to the Trustee to the effect that: (A)
          such supplemental trust deed constitutes legal, valid, binding and
          enforceable obligations of the Alternative Substitute Debtor, CTI and
          (if the Alternative Substitute Debtor is 

                                      -23-
<PAGE>
 
           not the Company) the Company; (B) the Bonds constitute legal, valid,
           binding and enforceable obligations of the Alternative Substitute
           Debtor; (C) the Guarantee constitutes legal, valid, binding and
           enforceable obligations of CTI and (if the Alternative Substitute
           Debtor is not the Company) the Company in respect of all sums from
           time to time payable by the Substitute Debtor in respect of the Bonds
           and under this Trust Deed; (D) the Alternative Substitute Debtor has
           obtained all governmental and regulatory approvals and consents
           necessary for its assumption of liability as principal debtor in
           respect of the Bonds and the Coupons in place of the Issuer; (E) CTI
           and (if the Alternative Substitute Debtor is not the Company) the
           Company have obtained all governmental and regulatory approvals and
           consents necessary for the Guarantee to be a binding obligation; and
           (F) such approvals and consents are at the time of substitution in
           full force and effect; and

     (iii) the delivery by the Issuer to the Trustee of a certificate of the
           Auditors to the effect that substantially all of the Indebtedness of
           CTI (other than Indebtedness in respect of the Bonds and Intercompany
           Indebtedness) has been: (A) transferred to and assumed by the
           Company; or (B) repaid, redeemed, purchased and cancelled and/or
           otherwise discharged.

(c)  Extra duties:  The Trustee shall be entitled to refuse to implement the
     substitution of any Substitute Debtor or Alternative Substitute Debtor if,
     pursuant to the law of the country of incorporation of the Substitute
     Debtor or Alternative Substitute Debtor, the assumption by the Substitute
     Debtor or Alternative Substitute Debtor of its obligations hereunder
     imposes additional responsibilities on the Trustee which, in the opinion of
     the Trustee, are materially over and above those which have been assumed
     under this Trust Deed.

(d)  Financial Status: The Trustee shall not have regard to the financial
     condition, profits or prospects of the Substitute Debtor or the Alternative
     Substitute Debtor in connection with any substitution pursuant to this
     Clause 7.3.

                                      -24-
<PAGE>
 
(e)  Supplemental:  Upon the assumption by the Substitute Debtor or the
     Alternative Substitute Debtor of the Issuer's obligations in respect of
     this Trust Deed and the Bonds, the Issuer shall be released from such
     obligations and, thereafter, all references in the Conditions to the Issuer
     shall be deemed to be references to the Substitute Debtor or, as the case
     may be, the Alternative Substitute Debtor.  Notice of the assumption by the
     Substitute Debtor or the Alternative Substitute Debtor of the Issuer's
     obligations in respect of this Trust Deed and the Bonds shall promptly (and
     in any event not later than 14 days after the execution of any such
     supplemental trust deed as aforesaid and after delivery of such opinions
     and certificates required by the Trustee under the Conditions and pursuant
     to this Trust Deed) be given by such Substitute Debtor or, as the case may
     be, such Alternative Substitute Debtor to the Bondholders.

7.4  Merger, consolidation and sale of assets:  Each of the Company, CTI and the
Issuer covenants with the Trustee that it will not, whether in a single
transaction or a series of related transactions, consolidate with or merge with
or into, or sell, assign, transfer, lease, convey or otherwise dispose (other
than by granting any Permitted Charge) of all or substantially all of its assets
to another Person (each a "Relevant Transaction") otherwise than in accordance
with and subject to the provisions of Condition 4(a)(v) and subject to the
following further conditions precedent;

(a)  the Trustee is satisfied that the surviving Person (as defined in Condition
     4(a)(v)) has obtained all governmental and regulatory approvals and
     consents for its assumption of liability as principal debtor in respect of
     the Bonds and Coupons or, as the case may be, as guarantor and the same are
     in full force and effect;

(b)  the Trustee is satisfied the Relevant Transaction will not impose any
     additional responsibilities on the Trustee, which, in the opinion of the
     Trustee, are materially over and above those which have been assumed under
     this Trust Deed;

(c)  if the surviving Person is incorporated, domiciled or resident for tax
     purposes in a territory other than the United Kingdom it has delivered, in
     form and substance satisfactory to the Trustee, an undertaking
     corresponding to the provisions of 

                                      -25-
<PAGE>
 
     Condition 8 (but with reference to such territory as well as to the United
     Kingdom);

(d)  any Officers' Certificate referred to in Condition 4(a)(v) shall be signed
     by two Directors of the Company, the Issuer or CTI, as the case may be; and

(e)  if the Relevant Transaction involves CTI, then the Company, or if the
     Company, then CTI, shall have undertaken to the Trustee that its
     liabilities and obligations under this Trust Deed will remain a binding
     obligation.

8.   Enforcement

8.1  Legal Proceedings:  The Trustee may at any time, at its discretion and
without notice, institute such proceedings as it thinks fit to enforce its
rights under this Trust Deed and shall be bound to do so if (and only if): (i)
it has been so requested in writing by the holders of at least one-fifth in
principal amount of the outstanding Bonds or has been so directed by an
Extraordinary Resolution; and (ii) it has been indemnified or secured to its
satisfaction.  Only the Trustee may enforce the provisions of the Bonds or this
Trust Deed and no Bondholder or Couponholder shall be entitled to proceed
directly against the Issuer or either of the Guarantors unless the Trustee,
having become bound so to proceed, fails to do so within a reasonable time and
such failure is continuing.

8.2  Evidence of Default:  If the Trustee (or any Bondholder or Couponholder
where entitled under this Trust Deed so to do) makes any claim, institutes any
legal proceeding or lodges any proof in a winding-up or insolvency of the Issuer
or a Guarantor under this Trust Deed or under the Bonds, proof therein that:

(a)  as regards any specified Bond the Issuer has made default in paying any
     principal, and/or (where the same is not paid against presentation of the
     Global Bond or, as the case may be, Coupon) interest due in respect of such
     Bond shall (unless the contrary be proved) be sufficient evidence that the
     Issuer has made the like default as regards all other Bonds in respect of
     which a corresponding payment is then due; and

(b)  as regards any specified Coupon the Issuer has made default in paying any
     interest due in respect of such Coupon shall 

                                      -26-
<PAGE>
 
     (unless the contrary be proved) be sufficient evidence that the Issuer has
     made the like default as regards all other Coupons in respect of which a
     corresponding payment is then due; and

for the purposes of (a) and (b) above a payment shall be a "corresponding"
payment notwithstanding that it is due in respect of a Bond of a different
denomination from that in respect of the above specified Bond or specified
Coupon.

9.   Application of Moneys

9.1  Application of Moneys:  All moneys received by the Trustee in respect of
the Bonds or amounts payable under this Trust Deed will (i) despite any
appropriation of all or part of them by the Issuer or either of the Guarantors
and (ii) unless and to the extent attributable in the opinion of the Trustee to
a particular series of Bonds, be apportioned pari passu and rateably between
each series of the Bonds, and all moneys received by the Trustee under this
Trust Deed to the extent attributable in the opinion of the Trustee to a
particular series of the Bonds or which are apportioned to such series as
aforesaid (including any moneys which represent principal or interest in respect
of Bonds or Coupons which have become void under the Conditions) be held by the
Trustee on trust to apply them (subject to Clause 9.2  (Investment of Moneys)
and Clause 4.8 (Suspense Account):

(a)  first, in payment or satisfaction of the costs, charges, expenses and
     liabilities incurred by the Trustee in the preparation and execution of the
     trusts of this Trust Deed (including remuneration of the Trustee);

(b)  secondly, in or towards payment pari passu and rateably of all arrears of
     interest remaining unpaid in respect of the Bonds of that series and all
     principal moneys due on or in respect of the Bonds of that series; and

(c)  thirdly, the balance (if any) in payment to the Issuer or, if such moneys
     were received from a Guarantor, that Guarantor;

and without prejudice to the provisions of this Clause, if the Trustee holds any
moneys which represent principal or interest in respect of Bonds or Coupons
which have become void under the Conditions, the Trustee shall hold such moneys
on the above trusts.

                                      -27-
<PAGE>
 
9.2  Investment of Moneys:  If the amount of the moneys at any time available
for payment of principal and interest in respect of the Bonds under Clause 9.1
(Application of Moneys) shall be less than a sum sufficient to pay at least one-
tenth of the principal amount of the Bonds then outstanding, the Trustee may, at
its discretion, invest such moneys upon some or one of the investments
hereinafter authorised with power from time to time, with like discretion, to
vary such investments; and such investment with the resulting income thereof may
be accumulated until the accumulations together with any other funds for the
time being under the control of the Trustee and available for the purpose shall
amount to a sum sufficient to pay at least one-tenth of the principal amount of
the Bonds then outstanding and such accumulation and funds (after deduction of
any taxes and any other deductibles applicable thereto) shall then be applied in
the manner aforesaid.

9.3  Authorised Investments:  Any moneys which under this Trust Deed may be
invested by the Trustee may be invested in the name or under the control of the
Trustee in any of the investments for the time being authorised by English law
for the investment by trustees of trust moneys or in any other investments,
whether similar to those aforesaid or not, which may be selected by the Trustee
or by placing the same on deposit in the name or under the control of the
Trustee with such bank or other financial institution as the Trustee may think
fit and in such currency as the Trustee in its absolute discretion may determine
and the Trustee may at any time vary or transfer any of such investments for or
into other such investments or convert any moneys so deposited into any other
currency and shall not be responsible for any loss occasioned by reason of any
such investments or such deposit whether by depreciation in value, fluctuation
in exchange rates or otherwise.

9.4  Payment to Bondholders and Couponholders:  Any payment to be made in
respect of the Bonds or the Coupons by the Issuer, either of the Guarantors or
the Trustee may be made in the manner provided in the Conditions and any payment
so made shall be a good discharge pro tanto, to the Issuer, such Guarantor or
the Trustee, as the case may be.  Any payment in full of interest made in
respect of a Coupon in the manner aforesaid shall extinguish any claim of a
Bondholder which may arise directly or indirectly in respect of such interest.

9.5  Production of Bonds and Coupons:  Upon any payment under Clause 9.4
(Payment to Bondholders and Couponholders) of principal 

                                      -28-
<PAGE>
 
or interest, the Bond or Coupon in respect of which such payment is made shall,
if the Trustee so requires, be produced to the Trustee or the Paying Agent by or
through whom such payment is made and the Trustee shall, in the case of part
payment, enface or cause such Paying Agent to enface a memorandum of the amount
and date of payment thereon or, in the case of payment in full, shall cause such
Bond or Coupon to be surrendered or shall cancel or procure the same to be
cancelled and shall certify or procure the certification of such cancellation.

9.6  Bondholders to be treated as holding all Coupons:  Wherever in this Trust
Deed the Trustee is required or entitled to exercise a power, trust, authority
or discretion under this Trust Deed, the Trustee shall, notwithstanding that it
may have express notice to the contrary, assume that each Bondholder is the
holder of all Coupons appertaining to each Bond of which he is the holder.


10.  Terms of Appointment

By way of supplement to the Trustee Act, 1925 of England and Wales, it is
expressly declared as follows:

10.1 Reliance on Information:

(a)  Advice:  The Trustee may in relation to this Trust Deed act on the opinion
     or advice of or a certificate or any information obtained from any lawyer,
     banker, valuer, surveyor, broker, auctioneer, accountant or other expert
     (whether obtained by the Trustee, the Issuer, the Guarantors, any
     Subsidiary of the Issuer or the Guarantors or any Paying Agent) and shall
     not be responsible for any loss occasioned by so acting; any such opinion,
     advice, certificate or information may be sent or obtained by letter,
     telegram, telex, cablegram or facsimile transmission and the Trustee shall
     not be liable for acting on any opinion, advice, certificate or information
     purporting to be so conveyed although the same shall contain some error or
     shall not be authentic.

(b)  Certificate of Directors or Authorised Signatory: The Trustee shall be
     entitled to rely upon any certificate provided to it pursuant to any of the
     provisions of this Trust Deed or the Conditions by the Issuer or either of
     the Guarantors as conclusive with regard to the matters certified therein

                                      -29-
<PAGE>
 
     without being under any duty or obligation to verify the accuracy thereof
     and shall not be responsible for any loss that may be occasioned thereby
     and the Trustee may call for and shall be at liberty to accept a
     certificate signed by a Director and/or an Authorised Signatory of the
     Issuer or either of the Guarantors or other person duly authorised on their
     behalf as to any fact or matter prima facie within the knowledge of the
     Issuer or such Guarantor, as the case may be, as sufficient evidence
     thereof and a like certificate to the effect that any particular dealing,
     transaction or step or thing is, in the opinion of the person so
     certifying, expedient as sufficient evidence that it is expedient and the
     Trustee shall not be bound in any such case to call for further evidence or
     be responsible for any loss that may be occasioned by its failing so to do
     but shall be entitled to accept any such certificate as conclusive evidence
     of the facts therein stated.

(c)  Certificate of Auditors:  A certificate of the Auditors that in their
     opinion a Subsidiary is or is not or was or was not at any particular time
     or during any particular period a Restricted Subsidiary or an Unrestricted
     Subsidiary shall, in the absence of manifest error, be conclusive and
     binding on the Issuer, the Guarantors, the Trustee and all Bondholders.

(d)  Resolution of Bondholders: The Trustee shall not be responsible for acting
     upon any resolution purporting to be a Written Resolution or to have been
     passed at any meeting of the Bondholders in respect whereof minutes have
     been made and signed even though it may subsequently be found that there
     was some defect in the constitution of the meeting or the passing of the
     resolution or that for any reason the resolution was not valid or binding
     upon the Bondholders and Couponholders.

(e)  Reliance on certification of clearing system:  The Trustee may call for and
     shall be at liberty to accept and place full reliance on as sufficient
     evidence thereof and shall not be liable to the Issuer, the Guarantors or
     any Bondholder by reason only of either having accepted as valid or not
     having rejected an original certificate or letter of confirmation
     purporting to be signed on behalf of Euroclear, Cedel Bank or any other
     relevant clearing system in relation to any matter.

                                      -30-
<PAGE>
 
(f)  Bondholders as a class: Whenever in this Trust Deed the Trustee is required
     in connection with any exercise of its powers, trusts, authorities or
     discretions to have regard to the interests of the Bondholders, it shall
     have regard to the interests of the Bondholders as a class and in
     particular, but without prejudice to the generality of the foregoing, shall
     not be obliged to have regard to the consequences of such exercise for any
     individual Bondholder resulting from his or its being for any purpose
     domiciled or resident in, or otherwise connected with, or subject to the
     jurisdiction of, any particular territory provided that insofar as Bonds
     are represented by a Global Bond which is held in or by a depositary for
     one or more clearing systems, the Trustee will, when having regard to the
     interests of the Bondholders, have regard to the interests of the
     Bondholders as a class.

(g)  Trustee not responsible for investigations: The Trustee shall not be
     responsible for, or for investigating any matter which is the subject of,
     any recital, statement, representation, warranty or covenant of any person
     contained in this Trust Deed, the Bonds, or any other agreement or document
     relating to the transactions herein or therein contemplated or for the
     execution, legality, effectiveness, adequacy, genuineness, validity,
     enforceability or admissibility in evidence thereof.

(h)  No obligation to monitor: The Trustee shall be under no obligation to
     monitor whether the Issuer or either of the Guarantors is complying with
     their respective obligations under this Trust Deed or the Bonds or whether
     there has been a breach thereof and shall be entitled, in the absence of
     actual knowledge of a breach of obligation, to assume that each such person
     is properly performing and complying with its obligations.

(i)  Bonds held by the Issuer or Guarantors: In the absence of knowledge or
     express notice to the contrary, the Trustee may assume without enquiry
     (other than requesting a certificate of the Issuer or a Guarantor under
     Clause 6.1(h) (Bonds held by Issuer etc) that no Bonds are for the time
     being held by or for the benefit of the Issuer, either of the Guarantors or
     their respective Subsidiaries.

(j)  Forged bonds: The Trustee shall not be liable to the Issuer, the Guarantors
     or any Bondholder or Couponholder by reason of 

                                      -31-
<PAGE>
 
     having accepted as valid or not having rejected any Bond or Coupon as such
     and subsequently found to be forged or not authentic.

(k)  Events of Default: The Trustee shall not be bound to give notice to any
     person of the execution of this Trust Deed or to take any steps to
     ascertain whether any Event of Default or Potential Event of Default has
     happened and, until it shall have actual knowledge or express notice to the
     contrary, the Trustee shall be entitled to assume that no such Event of
     Default or Potential Event of Default has happened and that each of the
     Issuer and the Guarantors is observing and performing all the obligations
     on its part contained in the Bonds and Coupons and under this Trust Deed
     and no event has happened as a consequence of which any of the Bonds may
     become repayable.



10.2 Trustee's powers and duties

(a)  Trustee's determination: The Trustee may determine whether or not a default
     in the performance by the Issuer or either of the Guarantors of any
     obligation under the provisions of this Trust Deed or contained in the
     Bonds or Coupons is capable of remedy and/or materially prejudicial to the
     interests of the Bondholders and if the Trustee shall certify that any such
     default is, in its opinion, not capable of remedy, such certificate shall
     be conclusive and binding upon the Issuer, the Guarantors, the Bondholders
     and the Couponholders.

(b)  Determination of questions: The Trustee as between itself and the
     Bondholders and the Couponholders shall have full power to determine all
     questions and doubts arising in relation to any of the provisions of this
     Trust Deed and every such determination, whether made upon a question
     actually raised or implied in the acts or proceedings of the Trustee, shall
     be conclusive and shall bind the Trustee, the Bondholders and the
     Couponholders.

(c)  Trustee's discretion: The Trustee shall (save as expressly otherwise
     provided herein) as regards all the trusts, powers, authorities and
     discretions vested in it by this Trust Deed or by operation of law, have
     absolute and uncontrolled discretion 

                                      -32-
<PAGE>
 
     as to the exercise or non-exercise thereof and the Trustee shall not be
     responsible for any loss, costs, damages, expenses or inconveniences that
     may result from the exercise or non-exercise thereof but whenever the
     Trustee is under the provisions of this Trust Deed bound to act at the
     request or direction of the Bondholders, the Trustee shall nevertheless not
     be so bound unless first indemnified and/or provided with security to its
     satisfaction against all actions, proceedings, claims and demands to which
     it may render itself liable and all costs, charges, damages, expenses and
     liabilities which it may incur by so doing.

(d)  Trustee's consent: Any consent given by the Trustee for the purposes of
     this Trust Deed may be given on such terms and subject to such conditions
     (if any) as the Trustee may require.

(e)  Conversion of currency: Where it is necessary or desirable for any purpose
     in connection with this Trust Deed to convert any sum from one currency to
     another it shall (unless otherwise provided by this Trust Deed or required
     by law) be converted at such rate or rates, in accordance with such method
     and as at such date for the determination of such rate of exchange, as may
     be specified by the Trustee in its absolute discretion as relevant and any
     rate, method and date so specified shall be binding on the Issuer, the
     Guarantors, the Bondholders and the Couponholders.

(f)  Application of proceeds: The Trustee shall not be responsible for the
     receipt or application by the Issuer of the proceeds of the issue of the
     Bonds, the exchange of any Temporary Global Bond for any Permanent Global
     Bond or any Permanent Global Bond for Definitive Bonds or the delivery of
     any Bond or Coupon to the persons entitled to them.

(g)  Error of judgment: The Trustee shall not be liable for any error of
     judgment made in good faith by any officer or employee of the Trustee
     assigned by the Trustee to administer its corporate trust matters.

(h)  Agents: The Trustee may, in the conduct of the trusts of this Trust Deed
     instead of acting personally, employ and pay an agent, whether or not a
     lawyer or other professional person, to transact or conduct, or concur in
     transacting or

                                      -33-
<PAGE>
 
     conducting, any business and to do or concur in doing all acts required to
     be done by the Trustee (including the receipt and payment of money) and the
     Trustee shall not be responsible for any misconduct on the part of any
     person appointed by it hereunder or be bound to supervise the proceedings
     or acts of any such person.

(i)  Delegation: The Trustee may, in the execution and exercise of all or any of
     the trusts, powers, authorities and discretions vested in it by this Trust
     Deed, act by responsible officers or a responsible officer for the time
     being of the Trustee and the Trustee may also whenever it thinks fit,
     whether by power of attorney or otherwise, delegate to any person or
     persons or fluctuating body of persons (whether being a joint trustee of
     this Trust Deed or not) all or any of the trusts, powers, authorities and
     discretions vested in it by this Trust Deed and any such delegation may be
     made upon such terms and conditions and subject to such regulations
     (including power to sub-delegate with the consent of the Trustee) as the
     Trustee may think fit in the interests of the Bondholders and the Trustee
     shall not be bound to supervise the proceedings and shall not in any way or
     to any extent be responsible for any loss incurred by any misconduct or
     default on the part of such delegate or sub-delegate.

(j)  Deposit of documents: The Trustee shall be at liberty to place this Trust
     Deed and all deeds and other documents relating to this Trust Deed in any
     safe deposit, safe or other receptacle selected by the Trustee, in any part
     of the world, or with any bank or banking company, lawyer or firm of
     lawyers believed by it to be of good repute, in any part of the world, and
     the Trustee shall not be responsible for or required to insure against any
     loss incurred in connection with any such deposit and the Issuer shall pay
     all sums required to be paid on account of or in respect of any such
     deposits.

(k)  Confidential information: The Trustee shall not (unless required by law or
     ordered so to do by a court of competent jurisdiction) be required to
     disclose to any Bondholder or Couponholder confidential information or
     other information made available to the Trustee by the Issuer or either of
     the Guarantors in connection with this Trust Deed and no Bondholder or
     Couponholder shall be entitled to take any action to obtain from the
     Trustee any such information.

                                      -34-
<PAGE>
 
10.3 Financial matters

(a)  Professional charges: Any trustee being a banker, lawyer, broker or other
     person engaged in any profession or business shall be entitled to charge
     and be paid all usual professional and other charges for business
     transacted and acts done by him or his partner or firm on matters arising
     in connection with the trusts of this Trust Deed and also his reasonable
     charges in addition to disbursements for all other work and business done
     and all time spent by him or his partner or firm on matters arising in
     connection with this Trust Deed, including matters which might or should
     have been attended to in person by a trustee not being a banker, lawyer,
     broker or other professional person.

(b)  Expenditure by the Trustee: Nothing contained in this Trust Deed shall
     require the Trustee to expend or risk its own funds or otherwise incur any
     financial liability in the performance of its duties or the exercise of any
     right, power, authority or discretion hereunder if it has reasonable
     grounds for believing the repayment of such funds or adequate indemnity
     against, or security for, such risk or liability is not reasonably assured
     to it.

(c)  Trustee may enter into financial transactions with the Issuer or either of
     the Guarantors: No Trustee and no director or officer of any corporation
     being a Trustee hereof shall by reason of the fiduciary position of such
     Trustee be in any way precluded from making any contracts or entering into
     any transactions in the ordinary course of business with the Issuer, either
     of the Guarantors or any of their respective Subsidiaries, or any person or
     body corporate directly or indirectly associated with the Issuer, either of
     the Guarantors or any of their respective Subsidiaries, or from accepting
     the trusteeship of any other debenture stock, debentures or securities of
     the Issuer, either of the Guarantors or any of their respective
     Subsidiaries or any person or body corporate directly or indirectly
     associated with the Issuer, either of the Guarantors or any of their
     respective Subsidiaries, and neither the Trustee nor any such director or
     officer shall be accountable to the Bondholders or the Issuer, either of
     the Guarantors or any of their respective Subsidiaries, or any person or
     body corporate directly or indirectly associated with the Issuer, either of

                                      -35-
<PAGE>
 
     the Guarantors or of their respective Subsidiaries, for any profit, fees,
     commissions, interest, discounts or share of brokerage earned, arising or
     resulting from any such contracts or transactions and the Trustee and any
     such Director or officer shall also be at liberty to retain the same for
     its or his own benefit.

10.4 Trustee liable for negligence:  None of the provisions of this Trust Deed
     shall in any case in which the Trustee has failed to show the degree of
     care and diligence required by it as trustee, having regard to the
     provisions of this Trust Deed conferring on the Trustee any powers,
     authorities or discretions, relieve or indemnify the Trustee against any
     liability for breach of trust or any liability which by virtue of any rule
     of law would otherwise attach to it in respect of any negligence, default,
     breach of duty or breach of trust of which it may be guilty in relation to
     its duties under this Trust Deed.

11.  Costs and Expenses

11.1 Remuneration

(a)  Remuneration for services:  The Issuer shall pay to the Trustee
     remuneration for its services as trustee as from the date of this Trust
     Deed, such remuneration to be at such rate as may from time to time be
     agreed between the Issuer and the Trustee.  Such remuneration shall be
     payable in advance on 21 May in each year, the first such payment to be
     made on the date hereof.  Upon the issue of any Further Bonds the rate of
     remuneration in force immediately prior thereto shall be increased by such
     amount as shall be agreed between the Issuer and the Trustee, such
     increased remuneration to be calculated from such date as shall be agreed
     as aforesaid.  The rate of remuneration in force from time to time may upon
     the final redemption of the whole of the Bonds of any series be reduced by
     such amount as shall be agreed between the Issuer and the Trustee, such
     reduced remuneration to be calculated from such date as shall be agreed as
     aforesaid.  Such remuneration shall accrue from day to day and be payable
     (in priority to payments to the Bondholders and Couponholders) up to and
     including the date when, all the Bonds having become due for redemption,
     the redemption moneys and interest thereon to the date of redemption have
     been paid to the Principal Paying Agent or the 

                                      -36-
<PAGE>
 
     Trustee, provided that if upon due presentation of any Bond or Coupon or
     any cheque, payment of the moneys due in respect thereof is improperly
     withheld or refused, remuneration will commence again to accrue.

(b)  Additional remuneration:  In the event of the occurrence of an Event of
     Default or a Potential Event of Default or the Trustee considering it
     expedient or necessary or being requested by the Issuer or either of the
     Guarantors to undertake duties which the Trustee and the Issuer agree to be
     of an exceptional nature or otherwise outside the scope of the normal
     duties of the Trustee under this Trust Deed, the Issuer shall pay to the
     Trustee such additional remuneration as shall be agreed between them.

(c)  Tax:  The Issuer shall in addition pay to the Trustee an amount equal to
     the amount of any value added tax or similar tax chargeable in respect of
     its remuneration under this Trust Deed.

(d)  Appointment of an expert:  In the event of the Trustee and the Issuer
     failing to agree:

     (i)  (in a case to which Clause 11.1(a) above applies) upon the amount of
          the remuneration; or

     (ii) (in a case to which Clause 11.1(b) above applies) upon whether such
          duties shall be of an exceptional nature or otherwise outside the
          scope of the normal duties of the Trustee under this Trust Deed, or
          upon such additional remuneration;

     such matters shall be determined by a financial institution (acting as an
     expert and not as an arbitrator) selected by the Trustee and approved by
     the Issuer or, failing such approval, nominated (on the application of the
     Trustee) by the President for the time being of The Law Society of England
     and Wales (the expenses involved in such nomination and the fees of such
     financial institution being payable by the Issuer) and the determination of
     any such financial institution shall be final and binding upon the Trustee
     and the Issuer.

(e)  Costs and expenses:  The Issuer shall also pay or discharge all costs,
     charges and expenses incurred by the Trustee in 

                                      -37-
<PAGE>
 
     relation to the preparation and execution of, the exercise of its powers
     and the performance of its duties under, and in any other manner in
     relation to, this Trust Deed, including but not limited to legal and
     travelling expenses and any stamp, issue, registration, documentary and
     other taxes or duties paid or payable by the Trustee in connection with any
     action taken or contemplated by or on behalf of the Trustee for enforcing,
     or resolving any doubt concerning, or for any other purpose in relation to,
     this Trust Deed.

(f)  Indemnity:  The Issuer shall indemnify the Trustee (i) in respect of all
     liabilities and expenses incurred by it or by any persons appointed by it
     to whom any trust, power, authority or discretion may be delegated by it in
     the execution or purported execution of the trusts, powers, authorities or
     discretions vested in it by this Trust Deed and (ii) against all
     liabilities, actions, proceedings, costs, claims and demands in respect of
     any matter or thing done or omitted in any way relating to this Trust Deed
     provided that it is expressly stated that Clause 10.4 (Trustee liable for
     negligence) shall apply in relation to these provisions.

(g)  Interest:  All amounts payable pursuant to Clauses 11.1(e) and (f) above
     shall be payable by the Issuer on the date specified in a demand by the
     Trustee and in the case of payments actually made by the Trustee prior to
     such demand shall carry interest at the rate of two per cent. per annum
     above the base rate from time to time of National Westminster Bank Plc from
     the date specified in such demand, and in all other cases shall (if not
     paid on the date specified in such demand or, if later, within three days
     after such demand and, in either case, the Trustee so requires) carry
     interest at such rate from the date specified in such demand.  All
     remuneration payable to the Trustee shall carry interest at such rate from
     the due date therefor.

(h)  Trustee's determination:  The Trustee shall be entitled in its absolute
     discretion to determine in respect of which series of Bonds any costs,
     charges, expenses or liabilities incurred under this Trust Deed have been
     incurred or to allocate any such costs, charges, expenses or liabilities
     between two or more series of Bonds.

                                      -38-
<PAGE>
 
(i)  Provisions continue in full force and effect:  Unless otherwise
     specifically stated in any discharge of this Trust Deed the provisions of
     this Clause 11.1 shall continue in full force and effect notwithstanding
     such discharge.

11.2 Stamp Duties:  The Issuer will pay all stamp duties, registration taxes,
capital duties and other similar duties or taxes (if any) payable in the United
Kingdom, Luxembourg and Belgium on (i) the constitution and issue of the Bonds
and Coupons, (ii) the initial delivery of the Bonds (iii) any action taken by
the Trustee (or any Bondholder or Couponholder where permitted or required under
this Trust Deed so to do) to enforce the provisions of the Bonds or this Trust
Deed and (iv) the execution of this Trust Deed.  If the Trustee (or any
Bondholder or Couponholder where permitted under this Trust Deed so to do) shall
take any proceedings against the Issuer or either of the Guarantors in any other
jurisdiction and if for the purpose of any such proceedings this Trust Deed or
any Bonds are taken into any such jurisdiction and any stamp duties or other
duties or taxes become payable thereon in any such jurisdiction, the Issuer will
pay (or reimburse the person making payment of) such stamp duties or other
duties or taxes (including penalties).

11.3 Indemnities separate:  The indemnities in this Trust Deed constitute
separate and independent obligations from the other obligations in this Trust
Deed, will give rise to separate and independent causes of action, will apply
irrespective of any indulgence granted by the Trustee and/or any Bondholder or
Couponholder and will continue in full force and effect despite any judgment,
order, claim or proof for a liquidated amount in respect of any sum due under
this Trust Deed or the Bonds and/or the Coupons or any other judgment or order.

11.4 Exchange rate indemnity:

(a)  Currency of Account and Payment: Sterling (the "Contractual Currency") is
     the sole currency of account and payment for all sums payable by the Issuer
     and the Guarantors under or in connection with this Trust Deed and the
     Bonds and the Coupons, including damages.

(b)  Extent of Discharge: An amount received or recovered in a currency other
     than the Contractual Currency (whether as a result of, or of the
     enforcement of, a judgment or order of a 

                                      -39-
<PAGE>
 
     court of any jurisdiction, in the winding-up or dissolution of the Issuer
     or the Guarantors or otherwise), by the Trustee or any Bondholder or the
     Couponholder in respect of any sum expressed to be due to it from the
     Issuer or the Guarantors will only discharge the Issuer and the Guarantors
     to the extent of the Contractual Currency amount which the recipient is
     able to purchase with the amount so received or recovered in that other
     currency on the date of that receipt or recovery (or, if it is not
     practicable to make that purchase on that date, on the first date on which
     it is practicable to do so).

(c)  Indemnity: If that Contractual Currency amount is less than the Contractual
     Currency amount expressed to be due to the recipient under this Trust Deed
     or the Bonds or the Coupons, the Issuer will indemnify it against any loss
     sustained by it as a result.  In any event, the Issuer will indemnify the
     recipient against the cost of making any such purchase.

12.  Appointment and Retirement

12.1 Appointment of Trustees:

(a)  The power of appointing new trustees of this Trust Deed shall be vested in
     the Issuer but no person shall be appointed who shall not previously have
     been approved by an Extraordinary Resolution.  A trust corporation may be
     appointed sole trustee hereof but subject thereto there shall be at least
     two trustees hereof one at least of which shall be a trust corporation.
     Any appointment of a new trustee hereof shall as soon as practicable
     thereafter be notified by the Issuer to the Paying Agents and to the
     Bondholders.  The Bondholders shall together have the power, exercisable by
     Extraordinary Resolution, to remove any trustee or trustees for the time
     being hereof.  The removal of any trustee shall not become effective unless
     there remains a trustee hereof (being a trust corporation) in office after
     such removal.

(b)  Notwithstanding the provisions of Clause 12.1(a) (Appointment of Trustees),
     the Trustee may, upon giving prior notice to the Issuer and the Guarantors
     but without the consent of the Issuer or the Guarantors or the Bondholders,
     appoint any person established or resident in any jurisdiction (whether a
     trust corporation or not) to act either as a separate trustee or as a co-
     trustee jointly with the Trustee:

                                      -40-
<PAGE>
 
     (i)   if the Trustee considers such appointment to be in the interests of
           the Bondholders; or

     (ii)  for the purposes of conforming to any legal requirements,
           restrictions or conditions in any jurisdiction in which any
           particular act or acts are to be performed; or

     (iii) for the purposes of obtaining a judgment in any jurisdiction or the
           enforcement in any jurisdiction either of a judgment already obtained
           or of this Trust Deed.

(c)  The Issuer and the Guarantors each hereby irrevocably appoints the Trustee
     to be its attorney in its name and on its behalf to execute any such
     instrument of appointment.  Such a person shall (subject always to the
     provisions of this Trust Deed) have such trusts, powers, authorities and
     discretions (not exceeding those conferred on the Trustee by this Trust
     Deed) and such duties and obligations as shall be conferred on such person
     or imposed by the instrument of appointment.  The Trustee shall have power
     in like manner to remove any such person.  Such reasonable remuneration as
     the Trustee may pay to any such person, together with any attributable
     costs, charges and expenses incurred by it in performing its function as
     such separate trustee or co-trustee, shall for the purposes of this Trust
     Deed be treated as costs, charges and expenses incurred by the Trustee.

12.2 Retirement of Trustees:  Any Trustee for the time being of this Trust Deed
may retire at any time upon giving not less than three calendar months' notice
in writing to the Issuer without assigning any reason therefor and without being
responsible for any costs occasioned by such retirement.  The retirement of any
Trustee shall not become effective unless there remains a trustee hereof (being
a trust corporation) in office after such retirement.  The Issuer hereby
covenants that in the event of the only trustee hereof which is a trust
corporation giving notice under this Clause it shall use its best endeavours to
procure a new trustee, being a trust corporation, to be appointed.

12.3 Competence of a majority of Trustees:  Whenever there shall be more than
two trustees hereof the majority of such trustees shall (provided such majority
includes a trust corporation) be competent 

                                      -41-
<PAGE>
 
to execute and exercise all the trusts, powers, authorities and discretions
vested by this Trust Deed in the Trustee generally.

12.4 Powers additional:  The powers conferred by this Trust Deed upon the
Trustee shall be in addition to any powers which may from time to time be vested
in it by general law or as the holder of any of the Bonds or Coupons.

12.5 Merger, etc:  Any corporation into which the Trustee may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which the Trustee shall be a
party, or any corporation succeeding to all or substantially all the corporate
trust business of the Trustee, shall be the successor of the Trustee hereunder,
provided such corporation shall be otherwise qualified and eligible under this
Clause, without the execution or filing of any paper or any further act on the
part of any of the parties hereto.

13.  Notices

13.1 Addresses for notices:  All notices and other communications hereunder
shall be made in writing and in English (by letter or fax) and shall be sent as
follows:

(a)  Issuer:  If to the Issuer, to it at:

     Castle Transmission (Finance) plc
     Warwick Technology Park
     Gallows Hill
     Heathcote Lane
     Warwick CV34 6TN

     Fax:  01926 416441
     Attention:  Company Secretary

(b)  Guarantors:  if to the Guarantors, to:

     Castle Transmission International Ltd

     Warwick Technology Park
     Gallows Hill
     Heathcote Lane
     Warwick CV34 6TN

                                      -42-
<PAGE>
 
     Fax:  01926 416441
     Attention:  Company Secretary

(c)  Trustee:  if to the Trustee, to it at:

     The Law Debenture Trust Corporation p.l.c.
     Princes House
     95 Gresham Street
     London EC2V 7LY

     Fax:  + 0171 696 5261
     Attention:  The Manager, Trust Administration

13.2 Effectiveness:  Every notice or other communication sent in accordance with
Clause 13.1 (Addresses for notices) shall be effective upon receipt by the
addressee provided that any such notice or other communication which would
otherwise take effect after 4.00 p.m. on any particular day shall not take
effect until 10.00 a.m. on the immediately succeeding business day in the place
of the addressee.

13.3 No Notice to Couponholders:  Neither the Trustee nor the Issuer nor the
Guarantors shall be required to give any notice to the Couponholders for any
purpose under this Trust Deed and the Couponholders shall be deemed for all
purposes to have notice of the contents of any notice given to the Bondholders
in accordance with Condition 17.

14.  Law and Jurisdiction

14.1 Governing Law:  This Trust Deed and the Bonds shall be governed by, and
construed in accordance with, English law.

14.2 Jurisdiction:  Each of the Issuer and the Guarantors agrees for the benefit
of the Trustee and the Bondholders that the courts of England shall have
jurisdiction to hear and determine any suit, action or proceedings and to settle
any disputes which may arise out of or in connection with this Trust Deed or the
Bonds or Coupons (respectively, "Proceedings" and "Disputes") and for such
purposes, irrevocably submits to the jurisdiction of such courts.

14.3 Non-exclusivity:  The submission to the jurisdiction of the courts of
England shall not (and shall not be construed so as to) limit the right of the
Trustee or any of the Bondholders to take 

                                      -43-
<PAGE>
 
Proceedings in any other court of competent jurisdiction nor shall the taking of
Proceedings in any one or more jurisdictions preclude the taking of Proceedings
in any other jurisdiction (whether concurrently or not) if and to the extent
permitted by applicable law.

14.4 Consent to enforcement etc:  Each of the Issuer and the Guarantors consents
generally in respect of any Proceedings to the giving of any relief or the issue
of any process in connection with such Proceedings including (without
limitation) the making, enforcement or execution against any property whatsoever
(irrespective of its use or intended use) of any order or judgment which may be
made or given in such Proceedings.

15.  Severability

In case any provision in or obligation under this Trust Deed shall be invalid,
illegal or unenforceable in any jurisdiction, the validity, legality and
enforceability of the remaining provisions or obligations, or of such provision
or obligation in any other jurisdiction, shall not in any way be affected or
impaired thereby.

16.  Counterparts

This Trust Deed may be executed in any number of counterparts, each of which
shall be deemed an original.

IN WITNESS WHEREOF this Trust Deed has been executed as a deed by the parties
hereto and is intended to be and is hereby delivered on the date first before
written.

                                      -44-
<PAGE>
 
                                First Schedule

                                    PART I

                    Form of Original Temporary Global Bond

ANY UNITED STATES PERSON WHO HOLDS THIS OBLIGATION WILL BE SUBJECT TO
LIMITATIONS UNDER THE UNITED STATES INCOME TAX LAWS, INCLUDING THE LIMITATIONS
PROVIDED IN SECTIONS 165(j) AND 1287(a) OF THE INTERNAL REVENUE CODE.

                       CASTLE TRANSMISSION (FINANCE) PLC
   (incorporated with limited liability under the laws of England and Wales)

                              (Pounds)125,000,000
                     9 per cent. Guaranteed Bonds due 2007
                      jointly and severally guaranteed by

                     CASTLE TRANSMISSION INTERNATIONAL LTD
   (incorporated with limited liability under the laws of England and Wales)

                                      and

                  CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD
   (incorporated with limited liability under the laws of England and Wales)


                             TEMPORARY GLOBAL BOND

1.   Introduction:  This Temporary Global Bond is issued in respect of
(Pounds)125,000,000 in aggregate principal amount of 9 per cent. Guaranteed
Bonds due 2007 (the "Bonds") by Castle Transmission (Finance) plc (the "Issuer")
and has the benefit of the guarantee of Castle Transmission International Ltd
and Castle Transmission Services (Holdings) Ltd (together, the "Guarantors" and
each a "Guarantor") contained in the Trust Deed (as defined below). The Bonds
are subject to, and have the benefit of, a trust deed dated 21 May 1997 (the
"Trust Deed") between the Issuer, the Guarantors and The Law Debenture Trust
Corporation p.l.c. as trustee (the "Trustee", which expression includes any
successor trustee(s) 

                                      -45-
<PAGE>
 
appointed from time to time in connection with the Bonds) for the holders of the
Bonds from time to time. The Bonds are the subject of a paying agency agreement
dated 21 May 1997 (the "Paying Agency Agreement") between the Issuer, the
Guarantors, the Trustee, Morgan Guaranty Trust Company of New York, London
office as principal paying agent (the "Principal Paying Agent", which expression
includes any successor principal paying agent appointed from time to time in
connection with the Bonds) and the other paying agents named therein (together
with the Principal Paying Agent, the "Paying Agents", which expression includes
any successor or additional paying agents appointed from time to time in
connection with the Bonds). Copies of the Trust Deed and the Paying Agency
Agreement are available for inspection at the specified office of each Paying
Agent.

2.   References to Conditions:  Any reference herein to the "Conditions" is to
the terms and conditions of the Bonds scheduled to the Trust Deed.

3.   Promise to pay:  For value received, the Issuer promises to pay to the
bearer of this Temporary Global Bond on 30 March 2007 (or on such earlier date
as the principal sum stated below becomes repayable in accordance with the
Conditions) the principal sum of:

                              (Pounds)125,000,000
              ONE HUNDRED AND TWENTY-FIVE MILLION POUNDS STERLING

and to pay in arrear on the dates specified in the Conditions interest on such
principal sum at the rate specified in the Conditions together with any
additional amounts payable in accordance with the Conditions, all subject to and
in accordance with the Conditions; provided, however, that such interest shall
be payable only:

     (a)  in the case of interest falling due before the Exchange Date (as
          defined below), to the extent that a certificate or certificates
          issued by Morgan Guaranty Trust Company of New York, Brussels office,
          as operator of the Euroclear System ("Euroclear") and/or Cedel Bank,
          societe anonyme ("Cedel Bank") dated not earlier than the date on
          which such interest falls due and in substantially the form set out in
          Schedule III hereto is/are delivered to the specified office of the
          Principal Paying Agent; or

                                      -46-
<PAGE>
 
     (b)  in the case of interest falling due at any time, to the extent that
          the Issuer has failed to procure the exchange for a permanent global
          bond of that portion of this Temporary Global Bond in respect of which
          such interest has accrued.

4.   Exchange:  On or after the day following the expiry of forty days after the
date of issue of this Temporary Global Bond (the "Exchange Date") the Issuer
shall procure the delivery of a permanent global bond (the "Permanent Global
Bond") to the bearer of this Temporary Global Bond (in the case of first
exchange) or (in the case of any subsequent exchange) an increase in the
principal amount of the Permanent Global Bond in accordance with its terms
against:

     (a)  presentation and (in the case of final exchange) surrender of this
          Temporary Global Bond at the specified office of the Principal Paying
          Agent; and

     (b)  receipt of a certificate or certificates issued by Euroclear and/or
          Cedel Bank dated not earlier than the Exchange Date and in
          substantially the form set out in Schedule III hereto.

5.   Form of Permanent Global Bond:  The Permanent Global Bond shall be in
substantially the form scheduled to the Trust Deed and shall be subject to the
Conditions.  The principal amount of the Permanent Global Bond shall be equal to
the aggregate of the principal amounts specified in the certificates issued by
Euroclear and/or Cedel Bank; provided, however, that in no circumstances shall
the principal amount of the Permanent Global Bond exceed the principal amount of
this Temporary Global Bond.

6.   Writing down:  On each occasion on which:

     (a)  the Permanent Global Bond is delivered or the principal amount thereof
          is increased in accordance with its terms in exchange for a further
          portion of this Temporary Global Bond; or

     (b)  Bonds represented by this Temporary Global Bond are to be cancelled in
          accordance with Condition 6(g),

                                      -47-
<PAGE>
 
the Issuer shall procure that (a) the principal amount of the Permanent Global
Bond, the principal amount of such increase or (as the case may be) the
aggregate principal amount of such Bonds and (b) the remaining principal amount
of this Temporary Global Bond (which shall be the previous principal amount
hereof less the principal amount referred to in (a) above) are noted in Schedule
I hereto, whereupon the principal amount of this Temporary Global Bond shall for
all purposes be as most recently so noted.

7.   Payments:  All payments in respect of this Temporary Global Bond shall be
made against presentation and (in the case of payment of principal in full with
all interest accrued thereon) surrender of this Temporary Global Bond at the
specified office of any Paying Agent and shall be effective to satisfy and
discharge the corresponding liabilities of the Issuer in respect of the Bonds.
On each occasion on which a payment of interest is made in respect of this
Temporary Global Bond, the Issuer shall procure that the same is noted in
Schedule I hereto.

8.   Conditions apply:  Until the whole of this Temporary Global Bond has been
exchanged as provided herein or cancelled in accordance with the Paying Agency
Agreement, the bearer of this Temporary Global Bond shall be subject to the
Conditions and, subject as herein provided, shall be entitled to the same rights
and benefits under the Conditions as if the bearer were the holder of the
Definitive Bonds and Coupons represented by the relevant part of this Temporary
Global Bond.

9.   Notices:  Notwithstanding Condition 17, while all the Bonds are represented
by this Temporary Global Bond (or by this Temporary Global Bond and the
Permanent Global Bond) and this Temporary Global Bond is (or this Temporary
Global Bond and the Permanent Global Bond are) deposited with a common
depositary for Euroclear and Cedel Bank, notices may be delivered to Euroclear,
Cedel Bank and each Paying Agent, and any such notice shall be deemed to have
been given to the Bondholders in accordance with Condition 17 on the date of
delivery to Euroclear, Cedel Bank and each Paying Agent.

10.  Governing law:  This Temporary Global Bond is governed by, and shall be
construed in accordance with, English law.

AS WITNESS the manual signature of a duly authorised officer of the Issuer.

                                      -48-
<PAGE>
 
CASTLE TRANSMISSION (FINANCE) PLC



By:



ISSUED in London on 21 May 1997


This Temporary Global Bond shall not be valid for any purpose until it has been
authenticated for and on behalf of Morgan Guaranty Trust Company of New York,
London office as principal paying agent.


AUTHENTICATED for and on behalf of
Morgan Guaranty Trust Company of New York, London office
as principal paying agent
without recourse, warranty or liability


By:

                                      -49-
<PAGE>
 
                                  SCHEDULE I

    Payments, Exchange for Permanent Global Bond and Cancellation of Bonds

<TABLE>
<CAPTION>
=========================================================================================================
   Date of       Amount of         Principal         Aggregate           Remaining          Authorised 
   payment,    interest then       amount of         principal           principal           Signature 
 exchange or       paid            Permanent       amount of Bonds     amount of this 
 cancellation                     Global Bond      then cancelled        Temporary 
                                 then delivered                         Global Bond      
                                  or by which  
                                   Permanent                          
                                  Global Bond                         
                                 then increased
<S>            <C>               <C>               <C>                 <C>                  <C> 
- --------------------------------------------------------------------------------------------------------- 
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
- ---------------------------------------------------------------------------------------------------------  
 
=========================================================================================================
</TABLE>

                                      -50-
<PAGE>
 
                                  SCHEDULE II

                     Form of Accountholder's Certification

                       CASTLE TRANSMISSION (FINANCE) PLC
   (incorporated with limited liability under the laws of England and Wales)

                              (Pounds)125,000,000
                     9 per cent. Guaranteed Bonds due 2007
                      jointly and severally guaranteed by

                     CASTLE TRANSMISSION INTERNATIONAL LTD
   (incorporated with limited liability under the laws of England and Wales)

                                      and

                  CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD
   (incorporated with limited liability under the laws of England and Wales)


This is to certify that as of the date hereof, and except as set forth below,
the above-captioned Securities held by you for our account (i) are owned by
persons that are not citizens or residents of the United States, domestic
partnerships, domestic corporations or any estate or trust the income of which
is subject to United States Federal income taxation regardless of its source
("United States persons"), (ii) are owned by United States person(s) that (a)
are foreign branches of a United States financial institution (as defined in
U.S. Treasury Regulations Section 1.165-12(c)(1)(v)) ("financial institutions")
purchasing for their own account or for resale, or (b) acquired the Securities
through foreign branches of United States financial institutions and who hold
the Securities through such United States financial institutions on the date
hereof (and in either case (a) or (b), each such United States financial
institution hereby agrees, on its own behalf or through its agent, that you may
advise the issuer or the issuer's agent that it will comply with the
requirements of Section 165(j)(3)(A), (B) or (C) of the Internal Revenue Code of
1986, as amended, and the regulations thereunder), or (iii) are owned by United
States or foreign financial institution(s) for purposes of resale during the
restricted period (as defined in U.S. Treasury Regulations Section 

                                      -51-
<PAGE>
 
1.163-5(c)(2)(i)(D)(7)), and in addition if the owner of the Securities is a
United States or foreign financial institution described in clause (iii) above
(whether or not also described in clause (i) or (ii)) this is to further certify
that such financial institution has not acquired the Securities for purposes of
resale directly or indirectly to a United States person or to a person within
the United States or its possessions.

[If the Securities are of the category contemplated in Section 230.903(c)(3) of
Regulation S under the Securities Act of 1933, as amended (the "Act"), then this
is also to certify that, except as set forth below, the Securities are
beneficially owned by (a) non-U.S. person(s) or (b) U.S. person(s) who purchased
the Securities in transactions which did not require registration under the Act.
As used in this paragraph the term "U.S. person" has the meaning given to it by
Regulation S under the Act.]

As used herein, "United States" means the United States of America (including
the States and the District of Columbia); and its "possessions" include Puerto
Rico, the U.S. Virgin Islands, Guam, American Samoa, Wake Island and the
Northern Mariana Islands.

We undertake to advise you promptly by tested telex on or prior to the date on
which you intend to submit your certification relating to the Securities held by
you for our account in accordance with your operating procedures if any
applicable statement herein is not correct on such date, and in the absence of
any such notification it may be assumed that this certification applies as of
such date.

This certification excepts and does not relate to (Pounds)[     ] of such
interest in the above Securities in respect of which we are not able to certify
and as to which we understand exchange and delivery of definitive Securities
(or, if relevant, exercise of any rights or collection of any interest) cannot
be made until we do so certify.

We understand that this certification is required in connection with certain tax
laws and, if applicable, certain securities laws of the United States.  In
connection therewith, if administrative or legal proceedings are commenced or
threatened in connection with which this certification is or would be relevant,
we irrevocably authorise you to produce this certification to any interested
party in such proceedings.

                                      -52-
<PAGE>
 
Date:  [         ]

[          ]/1/



As, or as agent for,
the beneficial owner(s) of the Securities
to which this certificate relates.

By:

     Authorised Signatory

- --------------------------------------------------------------------------------
/1/    Insert name of account-holder.

                                      -53-
<PAGE>
 
                                 SCHEDULE III

                  Form of Euroclear/Cedel Bank Certification


                       CASTLE TRANSMISSION (FINANCE) PLC
   (incorporated with limited liability under the laws of England and Wales)

                              (Pounds)125,000,000
                     9 per cent. Guaranteed Bonds due 2007
                      jointly and severally guaranteed by

                     CASTLE TRANSMISSION INTERNATIONAL LTD
   (incorporated with limited liability under the laws of England and Wales)

                                      and

                  CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD
   (incorporated with limited liability under the laws of England and Wales)


This is to certify that, based solely on certifications we have received in
writing, by tested telex or by electronic transmission from member organisations
appearing in our records as persons being entitled to a portion of the principal
amount set forth below (our "Member Organisations") substantially to the effect
set forth in the Paying Agency Agreement or other Agreement, as of the date
hereof, (Pounds)[        ] principal amount of the above-captioned Securities
(i) is owned by persons that are not citizens or residents of the United States,
domestic partnerships, domestic corporations or any estate or trust the income
of which is subject to United States Federal income taxation regardless of its
source ("United States persons"), (ii) is owned by United States persons that
(a) are foreign branches of United States financial institutions (as defined in
U.S. Treasury Regulations Section 1.165-12(c)(1)(v)) ("financial institutions")
purchasing for their own account or for resale, or (b) acquired the Securities
through foreign branches of United States financial institutions and who hold
the Securities through such United States financial institutions on the date
hereof (and in either case (a) or (b), each such United States financial
institution has agreed, on its 

                                      -54-
<PAGE>
 
own behalf or through its agent, that we may advise the Issuer or the Issuer's
agent that it will comply with the requirements of Section 165(j)(3)(A), (B) or
(C) of the Internal Revenue Code of 1986, as amended, and the regulations
thereunder), or (iii) is owned by United States or foreign financial
institutions for purposes of resale during the restricted period (as defined in
U.S. Treasury Regulations Section 1.163-5(c)(2)(i)(D)(7)), and to the further
effect that United States or foreign financial institutions described in clause
(iii) above (whether or not also described in clause (i) or (ii)) have certified
that they have not acquired the Securities for purposes of resale directly or
indirectly to a United States person or to a person within the United States or
its possessions.

If the Securities are of the category contemplated in Section 230.903(c)(3) of
Regulation S under the Securities Act of 1933, as amended (the "Act"), then this
is also to certify that, except as set forth below, the Securities are
beneficially owned by (a) non-U.S. person(s) or (b) U.S. person(s) who purchased
the Securities in transactions which did not require registration under the Act.
As used in this paragraph the term "U.S. person" has the meaning given to it by
Regulation S under the Act.

We further certify (i) that we are not making available herewith for exchange
(or, if relevant, exercise of any rights or collection of any interest) any
portion of the Temporary Global security excepted in such certifications and
(ii) that as of the date hereof we have not received any notification from any
of our Member Organisations to the effect that the statements made by such
Member Organisations with respect to any portion of the part submitted herewith
for exchange (or, if relevant, exercise of any rights or collection of any
interest) are no longer true and cannot be relied upon as of the date hereof.

We understand that this certification is required in connection with certain tax
laws and, if applicable, certain securities laws of the United States.  In
connection therewith, if administrative or legal proceedings are commenced or
threatened in connection with which this certification is or would be relevant,
we irrevocably authorise you to produce this certification to any interested
party in such proceedings.

Dated:

                                      -55-
<PAGE>
 
Morgan Guaranty Trust Company of New York,
Brussels office,
as operator of the Euroclear System

or

Cedel Bank, societe anonyme

By:

     Authorised signatory

                                      -56-
<PAGE>
 
                                First Schedule

                                    PART II

                    Form of Original Permanent Global Bond


ANY UNITED STATES PERSON WHO HOLDS THIS OBLIGATION WILL BE SUBJECT TO
LIMITATIONS UNDER THE UNITED STATES INCOME TAX LAWS, INCLUDING THE LIMITATIONS
PROVIDED IN SECTIONS 165(j) AND 1287(a) OF THE INTERNAL REVENUE CODE.

                       CASTLE TRANSMISSION (FINANCE) PLC
   (incorporated with limited liability under the laws of England and Wales)

                              (Pounds)125,000,000
                     9 per cent. Guaranteed Bonds due 2007
                      jointly and severally guaranteed by

                     CASTLE TRANSMISSION INTERNATIONAL LTD
   (incorporated with limited liability under the laws of England and Wales)

                                      and

                  CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD
   (incorporated with limited liability under the laws of England and Wales)


                             PERMANENT GLOBAL BOND

1.   Introduction:  This Permanent Global Bond is issued in respect of
(Pounds)125,000,000 in aggregate principal amount of 9 per cent. Guaranteed
Bonds due 2007 (the "Bonds") by Castle Transmission (Finance) plc (the "Issuer")
and has the benefit of the guarantee of Castle Transmission International Ltd
and Castle Transmission Services (Holdings) Ltd (together, the "Guarantors" and
each a "Guarantor") contained in the Trust Deed (as defined below).  The Bonds
are subject to, and have the benefit of, a trust deed dated 21 May 1997 (the
"Trust Deed") between the Issuer, the Guarantors and The Law Debenture Trust
Corporation p.l.c. as trustee (the "Trustee" which expression includes any
successor trustee(s) 

                                      -57-
<PAGE>
 
appointed from time to time in connection with the Bonds) for the holders of the
Bonds from time to time. The Bonds are the subject of a paying agency agreement
dated 21 May 1997 (the "Paying Agency Agreement") between the Issuer, the
Guarantors, the Trustee, Morgan Guaranty Trust Company of New York, London
office as principal paying agent (the "Principal Paying Agent", which expression
includes any successor principal paying agent appointed from time to time in
connection with the Bonds) and the other paying agents named therein (together
with the Principal Paying Agent, the "Paying Agents", which expression includes
any successor or additional paying agents appointed from time to time in
connection with the Bonds). Copies of the Trust Deed and the Paying Agency
Agreement are available for inspection at the specified office of each Paying
Agent.

2.   References to Conditions:  Any reference herein to the "Conditions" is to
the terms and conditions of the Bonds scheduled to the Trust Deed.

3.   Promise to pay:  For value received, the Issuer promises to pay to the
bearer of this Permanent Global Bond on 30 March 2007 (or on such earlier date
as the principal sum stated below becomes repayable in accordance with the
Conditions) the principal sum of:

                              (Pounds)125,000,000
              ONE HUNDRED AND TWENTY-FIVE MILLION POUNDS STERLING

and to pay in arrear on the dates specified in the Conditions interest on such
principal sum at the rate specified in the Conditions together with any
additional amounts payable in accordance with the Conditions, all subject to and
in accordance with the Conditions.

4.   Exchange:  This Permanent Global Bond will become exchangeable, in whole
but not in part only and at the request of the bearer of this Permanent Global
Bond, for Bonds in definitive form ("Definitive Bonds") in the following
circumstances:

     (i)    if Morgan Guaranty Trust Company of New York, Brussels office, as
            operator of the Euroclear System ("Euroclear") or Cedel Bank,
            societe anonyme ("Cedel Bank") has been closed for business for a
            continuous period of fourteen days (other than by reason of public
            holidays) or announces its intention permanently to cease business;
            or

                                      -58-
<PAGE>
 
     (ii)   the Trustee has, in accordance with Condition 9, given written
            notice to the Issuer declaring the Bonds to be immediately due and
            payable; or

     (iii)  the Trustee has become bound to institute proceedings against the
            Issuer or either of the Guarantors and has failed to do so within a
            reasonable time and such failure is continuing.

5.   Delivery of Definitive Bonds:  Whenever this Permanent Global Bond is to be
exchanged for Definitive Bonds, the Issuer shall procure the prompt delivery of
such Definitive Bonds, with coupons attached, to the bearer of this Permanent
Global Bond (and in any event within 30 days of such request) against the
presentation and surrender of this Permanent Global Bond at the specified office
of the Principal Paying Agent.  If such Definitive Bonds have not been delivered
by 5.00 p.m. (London time) on such thirtieth day, this Permanent Global Bond
(including the obligation to deliver Definitive Bonds) will become void and the
bearer of this Permanent Global Bond will have no further rights hereunder (but
without prejudice to the rights which the bearer of this Permanent Global Bond
or others may have under the Trust Deed).

6.   Form of Definitive Bonds:  The Definitive Bonds shall be in substantially
the form scheduled to the Trust Deed and shall be subject to the Conditions.

7.   Writing down:  On each occasion on which:

     (a)  a payment of principal is made in respect of this Principal Global
          Bond; or

     (b)  Definitive Bonds are delivered; or

     (c)  Bonds represented by this Permanent Global Bond are to be cancelled in
          accordance with Condition 6(g),

the Issuer shall procure that the aggregate principal amount of such Bonds and
the remaining principal amount of this Permanent Global Bond (which shall be the
previous principal amount hereof less the aggregate principal amount of such
Bonds) are noted in Schedule I hereto, whereupon the principal amount of this
Permanent Global Bond shall for all purposes be as most recently so noted.

                                      -59-
<PAGE>
 
8.   Writing up:  If this Permanent Global Bond was originally issued in
exchange for part only of the temporary global bond (the "Temporary Global
Bond") representing the Bonds, then, if at any time any further portion of such
Temporary Global Bond is exchanged for an interest in this Permanent Global
Bond, the principal amount of this Permanent Global Bond shall be increased by
the amount of such further portion, and the Issuer shall procure that the
principal amount of this Permanent Global Bond (which shall be the previous
principal amount hereof plus the amount of such further portion) is noted in
Schedule I hereto, whereupon the principal amount of this Permanent Global Bond
shall for all purposes be as most recently so noted.

9.   Payments:  All payments in respect of this Permanent Global Bond shall be
made against presentation and (in the case of payment of principal in full with
all interest accrued thereon) surrender of this Permanent Global Bond at the
specified office of any Paying Agent and shall be effective to satisfy and
discharge the corresponding liabilities of the Issuer in respect of the Bonds.
On each occasion on which a payment of interest is made in respect of this
Permanent Global Bond, the Issuer shall procure that the same is noted in
Schedule I hereto.

10.  Conditions apply:  Until the whole of this Permanent Global Bond has been
exchanged as provided herein or cancelled in accordance with the Paying Agency
Agreement, the bearer of this Permanent Global Bond shall be subject to the
Conditions and, subject as herein otherwise provided, shall be entitled to the
same rights and benefits under the Conditions as if the bearer were the holder
of the Definitive Bonds and Coupons represented by the relevant part of this
Permanent Global Bond.

11.  Notices:  Notwithstanding Condition 17, while all the Bonds are represented
by this Permanent Global Bond (or by this Permanent Global Bond and the
Temporary Global Bond) and this Permanent Global Bond is (or this Permanent
Global Bond and such Temporary Global Bond are) deposited with a common
depositary for Euroclear and Cedel Bank, notices may be delivered to Euroclear,
Cedel Bank and each Paying Agent, and any such notice shall be deemed to have
been given to the Bondholders in accordance with the Condition 17 on the date of
delivery to Euroclear, Cedel Bank and each Paying Agent.

                                      -60-
<PAGE>
 
12.  Governing law:  This Permanent Global Bond is governed by, and shall be
construed in accordance with, English law.

AS WITNESS the manual signature of a duly authorised officer of the Issuer.

CASTLE TRANSMISSION (FINANCE) PLC


By:


ISSUED in London on 21 May 1997


This Permanent Global Bond shall not be valid for any purpose until it has been
authenticated for and on behalf of Morgan Guaranty Trust Company of New York,
London office as principal paying agent.


AUTHENTICATED for and on behalf of
Morgan Guaranty Trust Company of New York, London office
as principal paying agent
without recourse, warranty or liability


By:

                                      -61-
<PAGE>
 
                                   SCHEDULE I

        Payments, Exchanges against Temporary Global Bond, Delivery of 
                  Definitive Bonds and Cancellation of Bonds

<TABLE>
<CAPTION>
====================================================================================================================================

   Date of             Amount of       Principal           Aggregate         Aggregate         New principal      Authorised 
   payment,          interest then     amount of           principal         principal        amount of this       signature
   exchange,             paid          Temporary           amount of      amount of Bonds       Permanent
  delivery or                          Global Bond        Definitive       then cancelled      Global Bond
  cancellation                         then               Bonds then                
                                       exchanged           delivered 
- ------------------------------------------------------------------------------------------------------------------------------------

<S>                  <C>               <C>                <C>             <C>                 <C>                 <C>
- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------

 
- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------


====================================================================================================================================

</TABLE>

                                      -62-
<PAGE>
 
                                Second Schedule

                                    PART A

                       Form of Definitive Original Bond



[On the face of the Bond:]

(Pounds)[10,000] [100,000]

ANY UNITED STATES PERSON WHO HOLDS THIS OBLIGATION WILL BE SUBJECT TO
LIMITATIONS UNDER THE UNITED STATES INCOME TAX LAWS, INCLUDING THE LIMITATIONS
PROVIDED IN SECTIONS 165(j) and 1287(a) OF THE INTERNAL REVENUE CODE.

                       CASTLE TRANSMISSION (FINANCE) PLC
   (incorporated with limited liability under the laws of England and Wales)

                              (Pounds)125,000,000
                     9 per cent. Guaranteed Bonds due 2007
                      jointly and severally guaranteed by

                     CASTLE TRANSMISSION INTERNATIONAL LTD
   (incorporated with limited liability under the laws of England and Wales)

                                      and

                  CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD
   (incorporated with limited liability under the laws of England and Wales)


                                DEFINITIVE BOND

This Bond is one of a series of Bonds (the "Bonds") of (Pounds)10,000/100,000
each in the aggregate principal amount of (Pounds)125,000,000 issued by Castle
Transmission (Finance) plc (the "Issuer") subject to and with the benefit of a
trust deed dated 21 May 1997 (the "Trust Deed") between the Issuer, Castle
Transmission International Ltd, Castle Transmission Services (Holdings) Ltd and

                                      -63-
<PAGE>
 
The Law Debenture Trust Corporation p.l.c. as trustee for the holders of the
Bonds.

The Issuer for value received promises, all in accordance with the terms and
conditions (the "Conditions") endorsed hereon, to pay to the bearer upon
surrender hereof on 30 March 2007 or on such earlier date as the same may become
payable in accordance with such Conditions the principal sum of

                            (Pounds)[10,000/100,000]
              [TEN THOUSAND/ONE HUNDRED THOUSAND POUNDS STERLING]

and to pay in arrear on the dates specified in such Conditions interest on such
principal sum at the rates specified in such Conditions, together with any
additional amounts which may become payable pursuant to such Conditions.

Neither this Bond nor any of the interest coupons appertaining hereto shall be
valid for any purpose until this Bond has been authenticated for and on behalf
of Morgan Guaranty Trust Company of New York, London office as principal paying
agent.

This Bond is governed by and shall be construed in accordance with, English law.

AS WITNESS the facsimile signature of a duly authorised officer on behalf of the
Issuer.

CASTLE TRANSMISSION (FINANCE) PLC

By:
     (duly authorised)


ISSUED in London as of 21 May 1997

AUTHENTICATED for and on behalf of
MORGAN GUARANTY TRUST COMPANY OF NEW YORK, London office as principal paying
agent
without recourse, warranty or liability


By:
     (duly authorised)

                                      -64-
<PAGE>
 
[On the reverse of the Bonds:]

                       TERMS AND CONDITIONS OF THE BONDS
            [As set out in Part B of the Schedule of the Trust Deed]

[At the foot of the Terms and Conditions]

                             PRINCIPAL PAYING AGENT

                   MORGAN GUARANTY TRUST COMPANY OF NEW YORK
                             60 Victoria Embankment
                                     London
                                    EC4Y 0JP

                                 PAYING AGENTS

                   MORGAN GUARANTY TRUST COMPANY OF NEW YORK
                               Avenue des Arts 35
                                B-1040 Brussels
                                    Belgium

                           BANQUE PARIBAS LUXEMBOURG
                              10A Boulevard Royal
                               L-2093 Luxembourg

                                      -65-
<PAGE>
 
                                Second Schedule

                                     PART B

                       Terms and Conditions of the Bonds

                                      -66-
<PAGE>
 
                                Second Schedule

                                     PART C

                            Form of Original Coupon


                          [On the face of the Coupon:]


CASTLE TRANSMISSION (FINANCE) PLC
(Pounds)125,000,000 9 per cent. Guaranteed Bonds due 2007
jointly and severally guaranteed by
CASTLE TRANSMISSION INTERNATIONAL LTD and
CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD

Coupon for (Pounds)[     .     ] due on 30 March 1998.
Coupon for (Pounds)[     .     ] due on 30 March
[1999/2000/2001/2002/2003/2004/2005/2006/2007].

Such amount is payable, subject to the terms and conditions (the "Conditions")
endorsed on the Bond to which this Coupon relates (which are binding on the
holder of this Coupon whether or not it is for the time being attached to such
Bond), against presentation and surrender of this Coupon at the specified office
for the time being of any of the agents shown on the reverse of this Coupon (or
any successor or additional agents appointed from time to time in accordance
with the Conditions).

ANY UNITED STATES PERSON WHO HOLDS THIS OBLIGATION WILL BE SUBJECT TO
LIMITATIONS UNDER THE UNITED STATES INCOME TAX LAWS, INCLUDING THE LIMITATIONS
PROVIDED IN SECTIONS 165(j) AND 1287(a) OF THE INTERNAL REVENUE CODE.

                                      -67-
<PAGE>
 
[On the reverse of the Coupon:]



                            PRINCIPAL PAYING AGENT:

                   Morgan Guaranty Trust Company of New York
                             60 Victoria Embankment
                                London EC4Y OJP

                                 PAYING AGENTS:

                   Morgan Guaranty Trust Company of New York
                               Avenue des Arts 35
                                B-1040 Brussels
                                    Belgium

                           Banque Paribas Luxembourg
                              10A Boulevard Royal
                               L-2093 Luxembourg

                                      -68-
<PAGE>
 
                                 Third Schedule

                   Provisions for meetings of the Bondholders


1.   Definitions:  In this Trust Deed and the Conditions, the following
expressions have the following meanings:

     "Block Voting Instruction" means, in relation to any Meeting, a document in
     the English language issued by a Paying Agent:

     (a)  certifying that certain specified Bonds (the "deposited Bonds") have
          been deposited with such Paying Agent (or to its order at a bank or
          other depositary) or blocked in an account with a clearing system and
          will not be released until the earlier of:

          (i)  the conclusion of the Meeting; and

          (ii) the surrender to such Paying Agent, not less than 48 hours before
               the time fixed for the Meeting (or, if the Meeting has been
               adjourned, the time fixed for its resumption), of the receipt for
               the deposited or blocked Bonds and notification thereof by such
               Paying Agent to the Issuer, the Guarantors and the Trustee;

     (b)  certifying that the depositor of each deposited Bond or a duly
          authorised person on its behalf has instructed the relevant Paying
          Agent that the votes attributable to such deposited Bond are to be
          cast in a particular way on each resolution to be put to the Meeting
          that, during the period of 48 hours before the time fixed for the
          Meeting, such instructions may not be amended or revoked;

     (c)  listing the total number and (if in definitive form) the certificate
          numbers of the deposited Bonds, distinguishing for each resolution
          between those in respect of which instructions have been given to vote
          for, or against, the resolution; and

     (d)  authorising a named individual or individuals (each a "Proxy") to vote
          in respect of the deposited Bonds in accordance with such
          instructions;

                                      -69-
<PAGE>
 
     "Chairman" means, in relation to any Meeting, the individual who takes the
     chair in accordance with paragraph 7 (Chairman);

     "Extraordinary Resolution" means a resolution passed at a Meeting duly
     convened and held in accordance with this Schedule by a majority of not
     less that three quarters of the votes cast;

     "Meeting" means a meeting of Bondholders (whether originally convened or
     resumed following an adjournment);

     "Relevant Fraction" means:

     (a)  for all business other than voting on an Extraordinary Resolution, one
          fifth;

     (b)  for voting on any Extraordinary Resolution other than one relating to
          a Reserved Matter, one-quarter; and

     (c)  for voting on any Extraordinary Resolution relating to a Reserved
          Matter, three quarters.

     provided that, in the case of a Meeting which has resumed after adjournment
     for want of a quorum, it means:

     (i)  for all business other than voting on an Extraordinary Resolution
          relating to a Reserved Matter, two or more Voters whatever the
          principal amount of the Bonds held or represented by them; and

     (ii) for voting on any Extraordinary Resolution relating to a Reserved
          Matter, two or more Voters holding or representing not less than one-
          quarter in principal amount of the outstanding Bonds.

     "Reserved Matter" means any proposal:

     (a)  to change any date fixed for payment of principal or interest in
          respect of the Bonds, to reduce the amount of principal or interest
          payable on any date in respect of the Bonds or to alter the method of
          calculating the amount of any payment in respect of the Bonds on
          redemption or maturity or the date for any such payment;

                                      -70-
<PAGE>
 
     (b)  to effect any exchange, conversion or substitution of the Bonds;

     (c)  to change the currency in which amounts due in respect of the Bonds
          are payable;

     (d)  to modify any provision of the Guarantee;

     (e)  to change the quorum required at any Meeting or the majority required
          to pass an Extraordinary Resolution; or

     (f)  to amend this definition;

     "Voter" means, in relation to any Meeting, the bearer of a Voting
     Certificate, a Proxy or the bearer of a Definitive Bond who produces such
     Definitive Bond at the Meeting;

     "Voting Certificate" means, in relation to any Meeting, a certificate in
     the English language issued by a Paying Agent and dated in which it is
     stated:

     (a)  that certain specified Bonds (the "deposited Bonds") have been
          deposited with such Paying Agent (or to its order at a bank or other
          depositary) or blocked in an account with a clearing system and will
          not be released until the earlier of:

          (i)  the conclusion of the Meeting; and

          (ii) the surrender of such certificate to such Paying Agent; and

     (b)  that the bearer of such certificate is entitled to attend and vote at
          the Meeting in respect of the deposited Bonds;

     "24 hours" means a period of 24 hours including all or part of a day upon
     which banks are open for business in both the places where the relevant
     meeting is to be held and in each of the places where the Paying Agents
     have their specified offices (disregarding for this purpose the day upon
     which such meeting is to be held) and such period shall be extended by one
     period or, to the extent necessary, more periods of 24 

                                      -71-
<PAGE>
 
     hours until there is included as aforesaid all or part of a day upon which
     banks are open for business as aforesaid; and

     "48 hours" means two consecutive periods of 24 hours.

2.   Issue of Voting Certificates and Block Voting Instructions:  The holder of
     a Bond may obtain a Voting Certificate from any Paying Agent or require any
     Paying Agent to issue a Block Voting Instruction by depositing such Bond
     with such Paying Agent or (to its satisfaction) held to its order or under
     its control or blocked in an account with a clearing system not later than
     48 hours before the time fixed for the relevant meeting.  A Voting
     Certificate or Block Voting Instruction shall be valid until the release of
     the deposited Bonds to which it relates.  So long as a Voting Certificate
     or Block Voting Instruction is valid, the bearer thereof (in the case of a
     Voting Certificate) or any Proxy named therein (in the case of a Block
     Voting Instruction) shall be deemed to be the holder of the Bonds to which
     it relates for all purposes in connection with the meeting.  A Voting
     Certificate and a Block Voting instruction cannot be outstanding
     simultaneously in respect of the same Bond.

3.   References to deposit/release of Bonds:  Where Bonds are in definitive
     form, references to the deposit, or release, of Bonds are to the deposit or
     (as the case may be) release of Definitive Bonds.  Where Bonds are
     represented by a Global Bond or are held in definitive form within a
     clearing system, references to the deposit  or release of Bonds shall be
     construed in accordance with the usual practices (including blocking the
     relevant account) of Morgan Guaranty Trust Company of New York, Brussels
     office, as operator of the Euroclear System and Cedel Bank, societe
     anonyme.

4.   Validity of Block Voting Instructions:  A Block Voting Instruction shall be
     valid only if it is deposited at such place as the Trustee designates, at
     least 24 hours before the time fixed for the relevant Meeting or the
     Chairman decides otherwise before the Meeting proceeds to business.  If the
     Trustee requires, a notarised copy of each Block Voting Instruction and
     satisfactory proof of the identity of each Proxy named therein shall be
     produced at the Meeting, but the Trustee shall not be obliged to
     investigate the validity of any Block Voting Instruction or the authority
     of any Proxy.

                                      -72-
<PAGE>
 
5.   Convening of Meeting:  The Issuer and each Guarantor (acting together) or
     the Trustee may convene a Meeting at any time, and the Trustee shall be
     obliged to do so subject to its being indemnified to its satisfaction upon
     the request in writing of Bondholders holding not less than one fifth of
     the aggregate principal amount of the outstanding Bonds.  Every Meeting
     shall be held on a date, and at a time and place, approved by the Trustee.

6.   Notice: At least 21 days' notice (exclusive of the day on which the notice
     is given and of the day on which the relevant Meeting is to be held)
     specifying the date, time and place of the Meeting shall be given to the
     Bondholders and the Paying Agents (with a copy to the Issuer) and the
     Guarantors where the meeting is convened by the Trustee or, where the
     Meeting is convened by the Issuer and the Guarantors, the Trustee). The
     notice shall set out the full text of any resolutions to be proposed unless
     the Trustee agrees that the notice shall instead specify the nature of the
     resolutions without including the full text and shall state that the Bonds
     may be deposited with, or to the order of, any Paying Agent for the purpose
     of obtaining Voting Certificates or appointing Proxies not later than 48
     hours before the time fixed for the Meeting.

7.   Chairman:  An individual (who may, but need not, be a Bondholder) nominated
     in writing by the Trustee may take the chair at any Meeting but, if no such
     nomination is made or if the individual nominated is not present within
     fifteen minutes after the time fixed for the Meeting, those present shall
     elect one of themselves to take the chair failing which the Issuer may
     appoint a Chairman.  The Chairman of an adjourned meeting need not be the
     same person as was the Chairman of the original meeting.

8.   Quorum:  The quorum at any Meeting shall be at least two Voters
     representing or holding not less than the Relevant Fraction of the
     aggregate principal amount of the outstanding Bonds; provided that, so long
     as at least the Relevant Fraction of the aggregate principal amount of the
     outstanding Bonds is represented by the Temporary Global Bond and/or the
     Permanent Global Bond, a single Proxy representing the holder thereof shall
     be deemed to be two Voters for the purpose of forming a quorum.

                                     -73-
<PAGE>
 
9.   Adjournment for want of quorum:  If within fifteen minutes after the time
     fixed for any Meeting a quorum is not present, then:

     (a)  in the case of a Meeting requested by Bondholders, it shall be
          dissolved; and

     (b)  in the case of any other Meeting (unless the Issuer and the Trustee
          otherwise agree), it shall be adjourned for such period (which shall
          be not less than 14 days and not more than 42 days) and to such place
          as the Chairman determines (with the approval of the Trustee);
          provided that:

          (i)  the Meeting shall be dissolved if the Issuer and the Guarantors
               (acting together) and the Trustee so decide; and

          (ii) no Meeting may be adjourned more than once for want of a quorum.

10.  Adjourned Meeting:  The Chairman, with the consent of (and shall if
     directed by) any Meeting adjourn such Meeting from time to time and from
     place to place, but no business shall be transacted at any adjourned
     Meeting except business which might lawfully have been transacted at the
     Meeting from which the adjournment took place.

11.  Notice following adjournment:  paragraph 6 (Notice) shall apply to any
     Meeting which is to be resumed after adjournment for want of a quorum save
     that:

     (a)  10 days' notice (exclusive of the day on which the notice is given and
          of the day on which the Meeting is to be resumed) shall be sufficient;
          and

     (b)  the notice shall specifically set out the quorum requirements which
          will apply when the Meeting resumes.

     It shall not be necessary to give notice of the resumption of a Meeting
     which has been adjourned for any other reason.

12.  Participation:  The following may attend and speak at a Meeting:

                                     -74-
<PAGE>
 
     (a)  Voters;

     (b)  representatives of the Issuer, the Guarantors and the Trustee;

     (c)  financial advisers of the Issuer, the Guarantors and the Trustee;

     (d)  legal counsel to the Issuer, the Guarantors and the Trustee; and

     (e)  any other person approved by the Meeting or the Trustee.

13.  Show of hands:  Every question submitted to a Meeting shall be decided in
     the first instance by a show of hands.  Unless a poll is validly demanded
     before or at the time that the result is declared, the Chairman's
     declaration that on a show of hands a resolution has been passed, passed by
     a particular majority, rejected or rejected by a particular majority shall
     be conclusive, without proof of the number of votes cast for, or against,
     the resolution.

14.  Poll:  A demand for a poll shall be valid if it is made by the Chairman,
     the Issuer, either of the Guarantors, the Trustee or one or more Voters
     representing or holding not less than one fiftieth of the aggregate
     principal amount of the outstanding Bonds.  The poll may be taken
     immediately or after such adjournment as the Chairman directs, but any poll
     demanded on the election of the Chairman or on any question of adjournment
     shall be taken at the Meeting without adjournment.  A valid demand for a
     poll shall not prevent the continuation of the relevant Meeting for any
     other business as the Chairman directs.

15.  Votes:  Every Voter shall have:

     (a)  on a show of hands, one vote; and

     (b)  on a poll, one vote in respect of each (Pounds)10,000 in aggregate
          face amount of the outstanding Bond(s) represented or held by him.

     Unless the terms of any Block Voting Instruction state otherwise, a Voter
     shall not be obliged to exercise all the 

                                     -75-
<PAGE>
 
     votes to which he is entitled or to cast all the votes which he exercises
     in the same way. In the case of a voting tie the Chairman shall have a
     casting vote.

16.  Validity of Votes by Proxies:  Any vote by a Proxy in accordance with the
     relevant Block Voting Instruction shall be valid even if such Block Voting
     Instruction or any instruction pursuant to which it was given has been
     amended or revoked, provided that neither the Issuer, the Guarantors, the
     Trustee nor the Chairman has been notified in writing of such amendment or
     revocation by the time which is 24 hours before the time fixed for the
     relevant Meeting.

17.  Powers: A Meeting shall have power (exercisable by Extraordinary
     Resolution), without prejudice to any other powers conferred on it or any
     other person:

     (a)  to approve any proposal by the Issuer and the Guarantors (acting
          together) for any modification, abrogation, variation or compromise of
          any provisions of this Trust Deed or the Conditions or any arrangement
          in respect of the obligations of the Issuer under or in respect of the
          Bonds or the obligations of the Guarantors under the Guarantee of the
          Bonds;

     (b)  to approve the exchange or substitution of the Bonds for, or the
          conversion of the Bonds into, shares, bonds or other obligations or
          securities of the Issuer or the Guarantors or any other person or body
          corporate formed or to be formed;

     (c)  to approve the substitution (otherwise than pursuant to Clause 7.3 of
          the Trust Deed) of any person for the Issuer (or any previous
          substitute) as principal obligor under these presents, the Bonds or
          the Coupons or the substitution of any person for either of the
          Guarantors as guarantor under the Guarantee of the Bonds;

     (d)  to waive any breach or authorise any proposed breach by the Issuer or
          either of the Guarantors of its obligations under or in respect of
          this Trust Deed or the Bonds, any proposed breach by either of the
          Guarantors of its obligations under the Guarantee or Bonds or any act
          or 

                                     -76-
<PAGE>
 
          omission which might otherwise constitute an event of default under
          the Bonds;

     (e)  to remove any Trustee;

     (f)  to approve the appointment of a new Trustee;

     (g)  to authorise the Trustee (subject to its being indemnified and/or
          secured to its satisfaction) or any other person to execute all
          documents and do all things necessary to give effect to any
          Extraordinary Resolution;

     (h)  to discharge or exonerate the Trustee from any liability in respect of
          any act or omission for which it may become responsible under this
          Trust Deed or the Bonds;

     (i)  to give any other authorisation or approval which under this Trust
          Deed or the Bonds is required to be given by Extraordinary Resolution;
          and

     (j)  to appoint any persons as a committee to represent the interests of
          the Bondholders and to confer upon such committee any powers which the
          Bondholders could themselves exercise by Extraordinary Resolution.

18.  Extraordinary Resolution binds all holders: An Extraordinary Resolution
     shall be binding upon all Bondholders and Couponholders, whether or not
     present at such Meeting, and each of the Bondholders shall be bound to give
     effect to it accordingly.  Notice of the result of every vote on an
     Extraordinary Resolution shall be given to the Bondholders and the Paying
     Agents (with a copy to the Issuer and the Guarantors when the meeting was
     convened by the Trustee or, where the relevant Meeting was convened by the
     Issuer and the Guarantors, the Trustee) within 14 days of the conclusion of
     the Meeting.

19.  Minutes: The Issuer (whom failing, the Guarantors) shall provide a minute
     book in which minutes of all resolutions and proceedings at each Meeting
     shall be made.  The Chairman shall sign the minutes, which shall be prima
     facie evidence of the proceedings recorded therein.  Unless and until the
     contrary is proved, every such Meeting in respect of the proceedings of
     which minutes have been summarised and signed shall be deemed 

                                     -77-
<PAGE>
 
     to have been duly convened and held and all resolutions passed or
     proceedings transacted at it to have been duly passed and transacted.

20.  Written Resolution: A Written Resolution shall take effect as if it were an
     Extraordinary Resolution.

21.  Further regulations:  Subject to all other provisions contained in this
     Trust Deed, the Trustee may without the consent of the Issuer, the
     Guarantors or the Bondholders prescribe such further regulations regarding
     the holding of Meetings of Bondholders and attendance and voting at them as
     the Trustee may in its sole discretion determine.

22.  Several series: The following provisions shall apply where outstanding
     Bonds belong to more than one series:

     (a)  Business which in the opinion of the Trustee affects the Bonds of only
          one series shall be transacted at a separate Meeting of the holders of
          the Bonds of that series.

     (b)  Business which in the opinion of the Trustee affects the Bonds of more
          than one series but does not give rise to an actual or potential
          conflict of interest between the holder of Bonds of one such series
          and the holders of Bonds of any other such series shall be transacted
          either at separate Meetings of the holders of the Bonds of each such
          series or at a single Meeting of the holders of the Bonds of all such
          series, as the Trustee shall in its absolute discretion determine.

     (c)  Business which in the opinion of the Trustee affects the Bonds of more
          than one series and gives rise to an actual or potential conflict of
          interest between the holders of Bonds of one such series and the
          holders of Bonds of any other such series shall be transacted at
          separate Meetings of the holders of the Bonds of each such series.

     (d)  The preceding paragraphs of this Schedule shall be applied as if
          references to the Bonds and Bondholders were to the Bonds of the
          relevant series and to the holders of such Bonds.

                                     -78-
<PAGE>
 
     (e)  In this paragraph, "business" includes (without limitation) the
          passing or rejection of any resolution.

                               Execution Clauses


EXECUTED as a deed by
CASTLE TRANSMISSION (FINANCE) PLC


By:  TED MILLER JR                    By:     GEORGE REESE


Director                              Secretary


EXECUTED as a deed by
CASTLE TRANSMISSION INTERNATIONAL LTD


By:  TED MILLER JR                    By:     GEORGE REESE


Director                              Secretary


EXECUTED as a deed by
CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD


By:  TED MILLER JR                    By:             
     GEORGE REESE


Director                              Secretary

                                     -79-
<PAGE>
 
THE COMMON SEAL of
THE LAW DEBENTURE TRUST CORPORATION p.l.c.
was affixed in the presence of:


Director:               D.M. ANDERSON
                                              SEAL

Assistant Trust Manager:  C. RAKESTROW

                                     -80-

<PAGE>
 
                                                                     EXHIBIT 4.5

                                                                  CONFORMED COPY


                       CASTLE TRANSMISSION (FINANCE) plc
                                   as Issuer

                                      and

                     CASTLE TRANSMISSION INTERNATIONAL LTD
                                  as Guarantor

                                      and

                  CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD
                                  as Guarantor

                                      and

                   THE LAW DEBENTURE TRUST CORPORATION p.l.c.
                                   as Trustee




           ---------------------------------------------------------

                         FIRST SUPPLEMENTAL TRUST DEED
                                 in respect of
           (Pounds)125,000,000 9 per cent. Guaranteed Bonds due 2007


           ---------------------------------------------------------




                               17th October 1997


                                Clifford Chance
                                     London
<PAGE>
 
THIS FIRST SUPPLEMENTAL TRUST DEED is made on 17th October, 1997

BETWEEN:

(1)  CASTLE TRANSMISSION (FINANCE) plc (the "Issuer");

(2)  CASTLE TRANSMISSION INTERNATIONAL LTD ("CTI") and CASTLE TRANSMISSION
     SERVICES (HOLDINGS) LTD (the "Company" and, together with CTI, the
     "Guarantors" and each severally a "Guarantor"); and

(3)  THE LAW DEBENTURE TRUST CORPORATION p.l.c. (the "Trustee").

IS SUPPLEMENTAL to a Trust Deed dated 21 May 1997 (the "Trust Deed ") made
between the parties hereto constituting the (Pounds)125,000,000 9 per cent.
Guaranteed Bonds due 2007 (the "Bonds") of the Issuer.

WHEREAS each of the parties hereto is of the opinion that there is a manifest
error in the Trust Deed and in the Conditions of the Notes and has agreed to
correct such manifest error in the manner set forth below, the Trustee acting
pursuant to the powers conferred on it by Clause 7.2 of the Trust Deed.

NOW THIS DEED WITNESSES AND IT IS HEREBY DECLARED as follows:

1.   Interpretation

1.1  All Capitalised terms used herein and not otherwise defined in this
     Supplemental Trust Deed shall have the meaning ascribed to them in the
     Trust Deed.

1.2  Clause headings are for convenience only and shall not affect the
     construction hereof.

2.   Amendments to the Trust Deed and the Conditions

In the Second  Schedule to the Trust Deed in the third paragraph of Condition 5
"(Pounds)772.50" shall be substituted for "(Pounds)7725" and Condition 5 of the
Bonds shall be correspondingly amended.

                                      -1-
<PAGE>
 
3.   Supplemental Provisions

Save as expressly modified by this Supplemental Trust Deed, the Trust Deed and
the Bonds shall continue in full force and effect.  The Trust Deed and this
Supplemental Trust Deed shall henceforth be read and construed in conjunction as
one deed.

4.   Miscellaneous

4.1  A Memorandum of the execution of this Supplemental Trust Deed shall be
     endorsed by the Trustee on the Trust Deed and by the Issuer on any
     duplicate thereof.

4.2  The Issuer will give notice to the Bondholders in accordance with the
     Conditions of the modification to the Trust Deed and the Conditions as set
     out in Clause 2 in the form set out in the Schedule to this Supplemental
     Trust Deed.

5.   Effectiveness of this Supplemental Trust Deed

The provisions of this Supplemental Trust Deed shall take effect on the date on
which this Supplemental Trust Deed shall be executed by all of the parties
hereto.

6.   Governing Law

This Supplemental Trust Deed is governed by, and shall be construed in
accordance with, English law.

IN WITNESS whereof this Supplemental Trust Deed has been executed as a deed by
the parties hereto and entered into the day and year first before written.

                                      -2-
<PAGE>
 
                                   SCHEDULE

           Notice to holders of the (Pounds)125,000,000 9 per cent.
                    Guaranteed Bonds due 2007 (the "Bonds")
              of Castle Transmission (Finance) plc (the "Issuer")
              guaranteed by Castle Transmission International Ltd
 and Castle Transmission Services (Holdings) Ltd (together the "Guarantors").


Notice is hereby given that, pursuant to Clause 7.2 of the Trust Deed dated 21
May 1997 (the "Trust Deed") constituting the Bonds between the Issuer, the
Guarantors and The Law Debenture Trust Corporation p.l.c. as trustee in respect
of the Bonds (the "Trustee"), the third paragraph of Condition 5 in the Second
Schedule to the Trust Deed has been amended by a First Supplemental Trust Deed
dated . 1997 between the Issuer, the Guarantors and the Trustee to provide that
the first payment of interest on the Bonds due on 30 March 1998 will be an
amount of (Pounds)772.50 per (Pounds)10,000 principal amount of Bonds.  A
corresponding amendment has been made to Condition 5 of the Bonds.

This amendment was made to correct a manifest error in the Trust Deed and the
Conditions by conforming the amount specified in Condition 5 to the rate of
interest applicable to the Bonds for the period from (and including) 21 May 1997
to (but excluding) 30 March 1998.



 

 

                                      -3-
<PAGE>
 
EXECUTED as a deed by
CASTLE TRANSMISSION (FINANCE) plc


By:         /s/ TED MILLER

Director

By:         /s/ GEORGE E. REESE

Secretary


EXECUTED as a deed by
CASTLE TRANSMISSION INTERNATIONAL LTD


By:         /s/ TED MILLER

Director

By:         /s/ GEORGE E. REESE

Secretary


EXECUTED as a deed by
CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD

By:         /s/ TED MILLER

Director    

By:         /s/ GEORGE E. REESE

Secretary

                                      -4-
<PAGE>
 
THE COMMON SEAL of
THE LAW DEBENTURE TRUST CORPORATION p.l.c.
was affixed in the presence of:


Director:                 CLIVE RAKESTROW

Assistant Trust Manager:  ABIGAIL HOLLADAY

                                      -5-

<PAGE>
 
             [LETTERHEAD OF CRAVATH, SWAINE & MOORE APPEARS HERE]

                                                                  March 11, 1998

                       Crown Castle International Corp.
                       --------------------------------
                    10 5/8% Senior Discount Notes Due 2007
                    --------------------------------------
                                Exchange Offer
                                --------------

Ladies and Gentlemen:

          We have acted as counsel for Crown Castle International Corp., a
Delaware corporation (the "Company"), in connection with the filing by the
Company with the Securities and Exchange Commission of a registration statement
on Form S-4 under the Securities Act of 1933 (the "Registration Statement"),
relating to the proposed issuance, in exchange for up to $251,000,000 aggregate
principal amount at maturity of the Company's 10 5/8% Senior Discount Notes due
2007 (the "Old Notes"), of a like principal amount at maturity of the Company's
10 5/8% Senior Discount Notes due 2007 (the "New Notes" and, together with the
Old Notes, the "Notes"). The New Notes are to be issued pursuant to the
indenture dated as of November 25, 1997 (the "Indenture"), among the Company and
the United States Trust Company of New York, as Trustee. Capitalized terms used
but not defined herein shall have the meanings assigned thereto in the
Registration Statement.

          In that connection, we have examined originals, or copies certified or
otherwise identified to our satisfaction, of such documents, corporate records
and other instruments as we have deemed necessary or appropriate for the
purposes of this opinion, including: (a) the Indenture; (b) the Registration
Rights Agreement dated November 25, 1997 among the Company, Lehman Brothers Inc.
and Credit Suisse First Boston Corporation (the "Registration Rights
Agreement"); and (c) and the form of New Notes filed as an exhibit to the
Registration Statement.

<PAGE>
 

                                                                               2




           In rendering the opinions contained herein, we have assumed (a) that 
each of such parties has the legal power to act in the respective capacity or 
capacities in which it is to act thereunder, (b) the authenticity of all the 
documents submitted to us as originals, (c) the conformity to the original 
documents of all documents submitted to us as copies and (d) the genuineness of 
all signatures on all documents submitted to us.

           Based upon the foregoing, we are of the opinion that:

           1.  With respect to the Indenture, assuming the Indenture has been 
duly authorized, executed and delivered by the Company and the Trustee and has 
been duly qualified under the Trust Indenture Act of 1939, the Indenture 
constitutes a legal, valid and binding obligation of the Company enforceable 
against the Company in accordance with its terms (subject to applicable 
bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and 
similar laws affecting creditors' rights generally from time to time in effect 
and to general principles of equity, including without limitation, concepts of 
materiality, reasonableness, good faith and fair dealing, regardless of whether 
considered in a proceeding at law or in equity.

           2.  With respect to the New Notes issued under the Indenture, when 
the New Notes have been duly authorized, executed and authenticated in 
accordance with the provisions of the Indenture, duly issued and delivered in 
exchange for the Old Notes pursuant to the Registration Rights Agreement, and 
assuming the New Notes are in the form filed as an exhibit to the Registration 
Statement, the New Notes will constitute legal, valid and binding obligations of
the Company entitled to the benefits of the Indenture and enforceable against 
the Company in accordance with their terms (subject to applicable bankruptcy, 
insolvency, fraudulent transfer, reorganization, moratorium and similar laws 
affecting creditors' rights generally from time to time in effect and to general
principles of equity, including, without limitation, concepts of materiality, 
reasonableness, good faith and fair dealing, regardless of whether considered in
a proceeding at law or in equity).

           3.  The discussion set forth under the heading "Certain United States
Federal Income Tax Considerations" in the Prospectus accurately describes the 
material United States Federal income tax consequences of the ownership and 
disposition of the Notes, and (insofar as it purports to do so) accurately 
represents our opinion.


<PAGE>
 

                                                                               3



           We are admitted to practice in the State of New York, and we express 
no opinion as to matters governed by any laws other than the laws of the State 
of New York and the Federal laws of the United States of America.

           We are aware that we are referred to under the heading "Legal
Matters" in the Registration Statement, and we hereby consent to (i) the use of
our name in the Registration Statement and (ii) the filing of this opinion as an
exhibit to the Registration Statement.


                                           Very truly yours,


                                           /s/ Cravath, Swaine & Moore




Crown Castle International Corp.
     510 Bering Drive, Suite 500
          Houston, TX  77057 


<PAGE>
 
                                                                    EXHIBIT 10.1

================================================================================




                         REGISTRATION RIGHTS AGREEMENT

                        Dated as of  November 25, 1997

                                 by and among

                       CROWN CASTLE INTERNATIONAL CORP.


                                      and



                             LEHMAN BROTHERS INC.

                                      and

                    CREDIT SUISSE FIRST BOSTON CORPORATION



================================================================================
<PAGE>
 
     This Registration Rights Agreement (this "Agreement") is made and entered
                                               ---------                      
into as of November 25, 1997 by and between Crown Castle International Corp., a
Delaware corporation (the "Company"), and Lehman Brothers Inc. and Credit Suisse
                           -------                                              
First Boston Corporation (each an "Initial Purchaser," and together, the
                                   -----------------                    
"Initial Purchasers"), who have agreed to purchase the Company's 10/5//8% Series
 ------------------                                                             
A Senior Discount Notes due 2007 (the "Series A Notes") pursuant to the Purchase
                                       --------------                           
Agreement (as defined below).

     This Agreement is made pursuant to the Purchase Agreement, dated November
20, 1997, (the "Purchase Agreement"), by and among the Company and the Initial
                ------------------                                            
Purchasers. In order to induce the Initial Purchasers to purchase the Series A
Notes, the Company has agreed to provide the registration rights set forth in
this Agreement. The execution and delivery of this Agreement is a condition to
the obligations of the Initial Purchasers set forth in Section 7 of the Purchase
Agreement. Capitalized terms used herein and not otherwise defined shall have
the meaning assigned to them the Indenture, dated November 25, 1997, between the
Company and United States Trust Company of New York as Trustee, relating to the
Series A Notes and the Series B Notes (the "Indenture").
                                            ---------   

     The parties hereby agree as follows:

SECTION 1.     DEFINITIONS

     As used in this Agreement, the following capitalized terms shall have the
     following meanings:

     Act:  The Securities Act of 1933, as amended.
     ---                                          

     Affiliate:  As defined in Rule 144 of the Act.
     ---------                                     

     Broker-Dealer:  Any broker or dealer registered under the Exchange Act.
     -------------                                                          

     Closing Date:  The date of this Agreement.
     ------------                              

     Commission:  The Securities and Exchange Commission.
     ----------                                          

     Consummate:  An Exchange Offer shall be deemed "Consummated" for purposes
     ----------                                                               
of this Agreement upon the occurrence of (a) the filing and effectiveness under
the Act of the Exchange Offer Registration Statement relating to the Series B
Notes to be issued in the Exchange Offer, (b) the maintenance of such Exchange
Offer Registration Statement continuously effective and the keeping of the
Exchange Offer open for a period not less than the period required pursuant to
Section 3(b) hereof and (c) the delivery by the Company to the Registrar under
the Indenture of Series B Notes in the same aggregate principal amount as the
aggregate principal amount of Series A Notes tendered by Holders thereof
pursuant to the Exchange Offer.

     Effectiveness Deadline:  As defined in Section 3(a) and 4(a) hereof.
     ----------------------                                              

     Exchange Act:  The Securities Exchange Act of 1934, as amended.
     ------------                                                   

     Exchange Offer:  The exchange and issuance by the Company of a principal
     --------------                                                          
amount at maturity of Series B Notes (which shall be registered pursuant to the
Exchange Offer Registration Statement) equal to the outstanding principal amount
at maturity of Series A Notes that are tendered by such Holders in connection
with such exchange and issuance.
<PAGE>
 
     Exchange Offer Registration Statement:  The Registration Statement relating
     -------------------------------------                                      
to the Exchange Offer, including the related Prospectus.

     Exempt Resales:  The transactions in which the Initial Purchasers propose
     --------------                                                           
to sell the Series A Notes to certain "qualified institutional buyers," as such
term is defined in Rule 144A under the Act and pursuant to Regulation S under
the Act.

     Filing Deadline:  As defined in Sections 3(a) and 4(a) hereof.
     ---------------                                               

     Holders:  As defined in Section 2 hereof.
     -------                                  

     Indemnified Holder:  As defined in Section 8(a) hereof.
     ------------------                                     

     Notes:  Series A and Series B Notes.
     -----                               

     Participating Broker-Dealer:  Any Broker-Dealer that holds Series B Notes
     ---------------------------                                              
that were acquired in the Exchange Offer in exchange for Series A Notes that
such Broker-Dealer acquired for its own account as a result of market making
activities or other trading activities (other than Series A Notes acquired
directly from the Company or any of its affiliates).

     Person:  An individual, partnership, corporation, trust or unincorporated
     ------                                                                   
organization, or a government or agency or political subdivision thereof.

     Prospectus:  The prospectus included in a Registration Statement at the
     ----------                                                             
time such Registration Statement is declared effective, as amended or
supplemented by any prospectus supplement and by all other amendments thereto,
including post-effective amendments, and all material incorporated by reference
into such Prospectus.

     Recommencement Date: As defined in Section 6(d) hereof.
     -------------------                                    

     Registration Default:  As defined in Section 5 hereof.
     --------------------                                  

     Registration Statement:  Any registration statement of the Company relating
     ----------------------                                                     
to (a) an offering of Series B Notes pursuant to an Exchange Offer or (b) the
registration for resale of Transfer Restricted Securities pursuant to the Shelf
Registration Statement, in each case, (i) that is filed pursuant to the
provisions of this Agreement and (ii) including the Prospectus included therein,
all amendments and supplements thereto (including post-effective amendments) and
all exhibits and material incorporated by reference therein.

     Regulation S: Regulation S promulgated under the Act.
     ------------                                         

     Rule 144: Rule 144 promulgated under the Act.
     --------                                     

     Series B Notes:  The Company's 10/5//8% Series B Senior Notes due 2007 to
     --------------                                                           
be issued pursuant to the Indenture:  (i) in the Exchange Offer or (ii) as
contemplated by Section 4 hereof.

     Shelf Registration Statement:  As defined in Section 4 hereof.
     ----------------------------                                  

     Suspension Notice:  As defined in Section 6(d) hereof.
     -----------------                                     

                                       2
<PAGE>
 
     TIA:  The Trust Indenture Act of 1939 (15 U.S.C. Section 77aaa-77bbbb) as
     ---                                                                      
in effect on the date of the Indenture.

     Transfer Restricted Securities:  Each Note, until the earliest to occur of
     ------------------------------                                            
(a) the date on which such Note is exchanged in the Exchange Offer and entitled
to be resold to the public by the Holder thereof without complying with the
prospectus delivery requirements of the Act, (b) the date on which such Note has
been disposed of in accordance with a Shelf Registration Statement, (c) the date
on which such Note is disposed of by a Broker-Dealer pursuant to the "Plan of
Distribution" contemplated by the Exchange Offer Registration Statement
(including delivery of the Prospectus contained therein) or (d) the date on
which such Note is distributed to the public pursuant to Rule 144 under the Act.

SECTION 2.     HOLDERS

     A Person is deemed to be a holder of Transfer Restricted Securities (each,
a "Holder") whenever such Person owns Transfer Restricted Securities.
   ------                                                            

SECTION 3.     REGISTERED EXCHANGE OFFER

     (a)  Unless the Exchange Offer shall not be permitted by applicable federal
law (after the procedures set forth in Section 6(a)(i) below have been complied
with), the Company shall (i) cause the Exchange Offer Registration Statement to
be filed with the Commission as soon as practicable after the Closing Date (the
"Exchange Offer Filing Date"), but in no event later than 45 days after the
 --------------------------                                                
Closing Date (such 45th day being the "Filing Deadline"), (ii) use all
                                       ---------------                
commercially reasonable efforts to cause such Exchange Offer Registration
Statement to become effective at the earliest possible time, but in no event
later than 150 days after the Closing Date (such 150th day being the
"Effectiveness Deadline"), (iii) in connection with the foregoing, (A) file all
 ----------------------                                                        
pre-effective amendments to such Exchange Offer Registration Statement as may be
necessary in order to cause it to become effective, (B) file, if applicable, a
post-effective amendment to such Exchange Offer Registration Statement pursuant
to Rule 430A under the Act and (C) cause all necessary filings, if any, in
connection with the registration and qualification of the Series B Notes to be
made under the Blue Sky laws of such jurisdictions as are necessary to permit
Consummation of the Exchange Offer and (iv) upon the effectiveness of such
Exchange Offer Registration Statement, commence and Consummate the Exchange
Offer.  The Exchange Offer shall be on the appropriate form permitting
registration of the Series B Notes to be offered in exchange for the Series A
Notes that are Transfer Restricted Securities and to permit resales of Series B
Notes by Broker-Dealers that tendered into the Exchange Offer for Series A Notes
that such Broker-Dealer acquired for its own account as a result of market
making activities or other trading activities (other than Series A Notes
acquired directly from the Company or any of its Affiliates) as contemplated by
Section 3(c) below.

     (b)  The Company shall use its best efforts to cause the Exchange Offer
Registration Statement to be effective continuously, and shall keep the Exchange
Offer open for a period of not less than the minimum period required under
applicable federal and state securities laws to Consummate the Exchange Offer;
provided, however, that in no event shall such period be less than 20 Business
Days.  The Company shall cause the Exchange Offer to comply with all applicable
federal and state securities laws.  No securities other than the Series B Notes
shall be included in the Exchange Offer Registration Statement.  The Company
shall use its best efforts to cause the Exchange Offer to be Consummated on the
earliest practicable date after the Exchange Offer Registration Statement has
become effective, but in no event later than 30 Business Days thereafter.

                                       3
<PAGE>
 
     (c)  The Company shall include a "Plan of Distribution" section in the
Prospectus contained in the Exchange Offer Registration Statement and indicate
therein that any Broker-Dealer that holds Transfer Restricted Securities that
were acquired for the account of such Broker-Dealer as a result of market-making
activities or other trading activities (other than Transfer Restricted
Securities acquired directly from the Company or any Affiliate of the Company),
may exchange such Transfer Restricted Securities  pursuant to the Exchange
Offer; however, such Broker-Dealer may be deemed to be an "underwriter" within
the meaning of the Act and must, therefore, deliver a prospectus meeting the
requirements of the Act in connection with its initial sale of any Series B
Notes received by such Broker-Dealer in the Exchange Offer and that the
Prospectus contained in the Exchange Offer Registration Statement may be used to
satisfy such prospectus delivery requirement.  Such "Plan of Distribution"
section shall also contain all other information with respect to such sales by
such Broker-Dealers that the Commission may require in order to permit such
sales pursuant thereto, but such "Plan of Distribution" shall not name any such
Broker-Dealer or disclose the amount of Transfer Restricted Securities held by
any such Broker-Dealer, except to the extent required by the Commission as a
result of a change in policy, rules or regulations after the date of this
Agreement.

     To the extent necessary to ensure that the Exchange Offer Registration
Statement is available for sales of Series B Notes by Broker-Dealers, the
Company agrees to use its best efforts to keep the Exchange Offer Registration
Statement continuously effective, supplemented and amended as required by the
provisions of Section 6(c) hereof and in conformity with the requirements of
this Agreement, the Act and the policies, rules and regulations of the
Commission as announced from time to time, for a period of 180 days from the
date on which the Exchange Offer is Consummated, or such shorter period as will
terminate when all Transfer Restricted Securities held by such Broker-Dealers
covered by such Registration Statement have been sold pursuant thereto (unless
such period is extended pursuant to Section 6(c)(i) below).  The Company shall
promptly provide sufficient copies of the latest version of such Prospectus to
such Broker-Dealers promptly upon request, and in no event later than one day
after such request, at any time during such period.

SECTION 4.     SHELF REGISTRATION

     (a)  Shelf Registration.  If (i) the Exchange Offer is not permitted by
          ------------------                                                
applicable law (after the Company has complied with the procedures set forth in
Section 6(a)(i) below) or (ii) if any Holder of Transfer Restricted Securities
shall notify the Company within 20 Business Days following the Consummation of
the Exchange Offer that (A) such Holder was prohibited by law or Commission
policy from participating in the Exchange Offer or (B) such Holder may not
resell the Series B Notes acquired by it in the Exchange Offer to the public
without delivering a prospectus and the Prospectus contained in the Exchange
Offer Registration Statement is not appropriate or available for such resales by
such Holder or (C) such Holder is a Broker-Dealer and holds Series A Notes
acquired directly from the Company or any of its Affiliates, then the Company
shall:

     (x)  cause to be filed, on or prior to 45 days after the earlier of (i) the
date on which the Company determines that the Exchange Offer Registration
Statement cannot be filed as a result of clause (a)(i) above and (ii) the date
on which the Company receives the notice specified in clause (a) (ii) above,
(such earlier date, the "Filing Deadline"), a shelf registration statement
                         ---------------                                  
pursuant to Rule 415 under the Act (which may be an amendment to the Exchange
Offer Registration Statement (the "Shelf Registration Statement")), relating to
                                   ----------------------------                
all Transfer Restricted Securities, and

                                       4
<PAGE>
 
     (y)  shall use all commercially reasonable efforts to cause such Shelf
Registration Statement to become effective on or prior to 90 days after the
Filing Deadline (such 90th day the "Effectiveness Deadline").
                                    ----------------------   

     If, after the Company has filed an Exchange Offer Registration Statement
that satisfies the requirements of Section 3(a) above, the Company is required
to file and make effective a Shelf Registration Statement solely because the
Exchange Offer is not permitted under applicable federal law, then the filing of
the Exchange Offer Registration Statement shall be deemed to satisfy the
requirements of clause (x) above; provided that, in such event, the Company
shall remain obligated to meet the Effectiveness Deadline set forth in clause
(y).

     The Company shall use its best efforts to keep any Shelf Registration
Statement required by this Section 4(a) continuously effective, supplemented and
amended as required by and subject to the provisions of Sections 6(b) and (c)
hereof to the extent necessary to ensure that it is available for sales of
Transfer Restricted Securities by the Holders thereof entitled to the benefit of
this Section 4(a), and to ensure that it conforms with the requirements of this
Agreement, the Act and the policies, rules and regulations of the Commission as
announced from time to time, for a period of at least two years (as extended
pursuant to Section 6(c)(i)) following the date on which such Shelf Registration
Statement first becomes effective under the Act, or such shorter period as will
terminate when all Transfer Restricted Securities covered by such Registration
Statement (i) have been sold pursuant thereto or (ii) are no longer restricted
Securities (as defined in Rule 144 under the Act).

     (b)  Provision by Holders of Certain Information in Connection with the
          ------------------------------------------------------------------ 
Shelf Registration Statement. No Holder of Transfer Restricted Securities may
- ----------------------------
include any of its Transfer Restricted Securities in any Shelf Registration
Statement pursuant to this Agreement unless and until such Holder furnishes to
the Company in writing, within 20 days after receipt of a request therefor, the
information specified in Item 507 or 508 of Regulation S-K, as applicable, of
the Act for use in connection with any Shelf Registration Statement or
Prospectus or preliminary Prospectus included therein. No Holder of Transfer
Restricted Securities shall be entitled to liquidated damages pursuant to
Section 5 hereof unless and until such Holder shall have provided all such
information. Each selling Holder agrees to promptly furnish additional
information required to be disclosed in order to make the information previously
furnished to the Company by such Holder not materially misleading.

SECTION 5.     LIQUIDATED DAMAGES

     (a)  If (i) any Registration Statement required by this Agreement is not
filed with the Commission on or prior to the applicable Filing Deadline, (ii)
any such Registration Statement has not been declared effective by the
Commission on or prior to the applicable Effectiveness Deadline, (iii) the
Exchange Offer has not been Consummated within 30 Business Days after the
Exchange Offer Registration Statement is first declared effective by the
Commission or (iv) any Registration Statement required by this Agreement is
filed and declared effective but shall thereafter cease to be effective or fail
to be usable for its intended purpose without being succeeded immediately by a
post-effective amendment to such Registration Statement that cures such failure
and that is itself declared effective immediately (except as permitted in
paragraph (b); such period of time during which any such Registration Statement
is not effective or any such Registration Statement or the related Prospectus is
not usable being referred to as a Blackout Period") (each such event referred to
in clauses (i) through (iv), a "Registration Default"), then the Company hereby
                                --------------------
agrees to pay to each Holder of Transfer Restricted Securities affected thereby
liquidated damages in an amount equal to $.05 per week per $1,000 in Accreted
Value of Transfer Restricted Securities held by such Holder for each week or
portion thereof 

                                       5
<PAGE>
 
that the Registration Default continues for the first 90-day period immediately
following the occurrence of such Registration Default. The amount of the
liquidated damages shall increase by an additional $.05 per week per $1,000 in
Accreted Value of Transfer Restricted Securities with respect to each subsequent
90-day period until all Registration Defaults have been cured, up to a maximum
amount of liquidated damages for all Registration Defaults of $.50 per week per
$1,000 in Accreted Value of Transfer Restricted Securities. Notwithstanding
anything to the contrary set forth herein, (1) upon filing of the Exchange Offer
Registration Statement (and/or, if applicable, the Shelf Registration
Statement), in the case of (i) above, (2) upon the effectiveness of the Exchange
Offer Registration Statement (and/or, if applicable, the Shelf Registration
Statement), in the case of (ii) above, (3) upon Consummation of the Exchange
Offer, in the case of (iii) above, or (4) upon the filing of a post-effective
amendment to the Registration Statement or an additional Registration Statement
that causes the Exchange Offer Registration Statement (and/or, if applicable,
the Shelf Registration Statement) to again be declared effective or made usable
in the case of (iv) above, the liquidated damages payable with respect to the
Transfer Restricted Securities as a result of such clause (i), (ii), (iii) or
(iv), as applicable, shall cease.

     (b)  A Registration Default referred to in Section 5(a)(iv) shall be deemed
not to have occurred and be continuing in relation to a Registration Statement
or the related Prospectus if (i) the Blackout Period has occurred solely as a
result of (x) the filing of a post-effective amendment to such Shelf
Registration Statement to incorporate annual audited financial information with
respect to the Company where such post-effective amendment is not yet effective
and needs to be declared effective to permit Holders to use the related
Prospectus or (y) the occurrence of other material events with respect to the
Company that would need to be described in such Registration Statement or the
related Prospectus and (ii) in the case of clause (y), the Company is proceeding
promptly and in good faith to amend or supplement (including by way of filing
documents under the Exchange Act which are incorporated by reference into the
Registration Statement) such Registration Statement and the related Prospectus
to describe such events: provided, however, that in any case if such Blackout
Period occurs for a continuous period in excess of 30 days, a Registration
Default shall be deemed to have occurred on the 31st day of such Blackout Period
and liquidated damages shall be payable in accordance with the above paragraph
from the day such Registration Default occurs until such Registration Default is
cured or until the Company is no longer required pursuant to this Agreement to
keep such Registration Statement effective or such Registration Statement or the
related Prospectus usable; provided further, however, that in no event shall the
total of all Blackout Periods exceed 60 days in the aggregate in any 12-month
period.

     All accrued liquidated damages shall be paid to the Holders entitled
thereto, in the manner provided for the payment of interest in the Indenture, on
each Interest Payment Date, as more fully set forth in the Indenture and the
Notes.  All obligations of the Company set forth in the preceding paragraph that
are outstanding with respect to any Transfer Restricted Security at the time
such security ceases to be a Transfer Restricted Security shall survive until
such time as all such obligations with respect to such Security shall have been
satisfied in full.

SECTION 6.     REGISTRATION PROCEDURES

     (a)  Exchange Offer Registration Statement. In connection with the Exchange
Offer, the Company shall comply with all applicable provisions of Section 6(c)
below, shall use its best efforts to effect such exchange and to permit the
resale of Series B Notes by Broker-Dealers that tendered in the Exchange Offer
Series A Notes that such Broker-Dealer acquired for its own account as a result
of its market making activities or other trading activities (other than Series A
Notes acquired directly from the Company or any of its Affiliates) being sold in
accordance with the intended method or methods of distribution thereof, and
shall comply with all of the following provisions:

                                       6
<PAGE>
 
          (i)    If, following the date hereof there has been announced a change
     in Commission policy with respect to exchange offers such as the Exchange
     Offer, that in the reasonable opinion of counsel to the Company raises a
     substantial question as to whether the Exchange Offer is permitted by
     applicable federal law, the Company hereby agrees to seek a no-action
     letter or other favorable decision from the Commission allowing the Company
     to Consummate an Exchange Offer for such Transfer Restricted Securities.
     The Company hereby agrees to pursue the issuance of such a decision to the
     Commission staff level. In connection with the foregoing, the Company
     hereby agrees to take all such other actions as may be requested by the
     Commission or otherwise required in connection with the issuance of such
     decision, including without limitation (A) participating in telephonic
     conferences with the Commission, (B) delivering to the Commission staff an
     analysis prepared by counsel to the Company setting forth the legal bases,
     if any, upon which such counsel has concluded that such an Exchange Offer
     should be permitted and (C) diligently pursuing a resolution (which need
     not be favorable) by the Commission staff of such submission.

          (ii)   As a condition to its participation in the Exchange Offer, each
     Holder of Transfer Restricted Securities (including, without limitation,
     any Holder who is a Broker Dealer) shall furnish, upon the request of the
     Company, prior to the Consummation of the Exchange Offer, a written
     representation to the Company (which may be contained in the letter of
     transmittal contemplated by the Exchange Offer Registration Statement) to
     the effect that (A) it is not an Affiliate of the Company, (B) it is not
     engaged in, and does not intend to engage in, and has no arrangement or
     understanding with any person to participate in, a distribution of the
     Series B Notes to be issued in the Exchange Offer and (C) it is acquiring
     the Series B Notes in its ordinary course of business. Each Holder using
     the Exchange Offer to participate in a distribution of the Series B Notes
     hereby acknowledges and agrees that, if the resales are of Series B Notes
     obtained by such Holder in exchange for Series A Notes acquired directly
     from the Company or an Affiliate thereof, it (1) could not, under
     Commission policy as in effect on the date of this Agreement, rely on the
     position of the Commission enunciated in Morgan Stanley and Co., Inc.
                                              ----------------------------
     (available June 5, 1991) and Exxon Capital Holdings Corporation (available
                                  ----------------------------------           
     May 13, 1988), as interpreted in the Commission's letter to Shearman &
                                                                 ----------
     Sterling dated July 2, 1993, and similar no-action letters (including, if
     --------                                                                 
     applicable, any no-action letter obtained pursuant to clause (i) above),
     and (2) must comply with the registration and prospectus delivery
     requirements of the Act in connection with a secondary resale transaction
     and that such a secondary resale transaction must be covered by an
     effective registration statement containing the selling security holder
     information required by Item 507 or 508, as applicable, of Regulation S-K.

          (iii)  Prior to effectiveness of the Exchange Offer Registration
     Statement, the Company shall provide a supplemental letter to the
     Commission (A) stating that the Company is registering the Exchange Offer
     in reliance on the position of the Commission enunciated in Exxon Capital
                                                                 -------------
     Holdings Corporation (available May 13, 1988), Morgan Stanley and Co., Inc.
     --------------------                           ----------------------------
     (available June 5, 1991) as interpreted in the Commission's letter to
     Shearman & Sterling dated July 2, 1993, and, if applicable, any no-action
     -------------------                                                      
     letter obtained pursuant to clause (i) above, (B) including a
     representation that the Company  has not entered into any arrangement or
     understanding with any Person to distribute the Series B Notes to be
     received in the Exchange Offer and that, to the best of the Company's
     information and belief, each Holder participating in the Exchange Offer is
     acquiring the Series B Notes in its ordinary course of business and has no
     arrangement or understanding with any Person to participate in the
     distribution of the Series B Notes received in the Exchange Offer and (C)
     any other undertaking or representation required 

                                       7
<PAGE>
 
     by the Commission as set forth in any no-action letter obtained pursuant to
     clause (i) above, if applicable.

     (b)  Shelf Registration Statement. In connection with the Shelf
          ----------------------------
Registration Statement, the Company shall comply with all the provisions of
Section 6(c) below and shall use its best efforts to effect such registration to
permit the sale of the Transfer Restricted Securities being sold in accordance
with the intended method or methods of distribution thereof (as indicated in the
information furnished to the Company pursuant to Section 4(b) hereof), and
pursuant thereto the Company will prepare and file with the Commission a
Registration Statement relating to the registration on any appropriate form
under the Act, which form shall be available for the sale of the Transfer
Restricted Securities in accordance with the intended method or methods of
distribution thereof within the time periods and otherwise in accordance with
the provisions hereof.

     (c)  General Provisions. In connection with any Registration Statement and
          ------------------
any related Prospectus required by this Agreement, the Company shall:

          (i)    use its best efforts to keep such Registration Statement
     continuously effective and provide all requisite financial statements for
     the period specified in Section 3 or 4 of this Agreement, as applicable.
     Upon the occurrence of any event that would cause any such Registration
     Statement or the Prospectus contained therein (A) to contain a material
     misstatement or omission or (B) not to be effective and usable for resale
     of Transfer Restricted Securities during the period required by this
     Agreement, the Company shall file promptly an appropriate amendment to such
     Registration Statement curing such defect, and, if Commission review is
     required, use its best efforts to cause such amendment to be declared
     effective as soon as practicable.

          (ii)   prepare and file with the Commission such amendments and post-
     effective amendments to the applicable Registration Statement as may be
     necessary to keep such Registration Statement effective for the applicable
     period set forth in Section 3 or 4 hereof, as the case may be; cause the
     Prospectus to be supplemented by any required Prospectus supplement, and as
     so supplemented to be filed pursuant to Rule 424 under the Act, and to
     comply fully with Rules 424, 430A and 462, as applicable, under the Act in
     a timely manner; and comply with the provisions of the Act with respect to
     the disposition of all securities covered by such Registration Statement
     during the applicable period in accordance with the intended method or
     methods of distribution by the sellers thereof set forth in such
     Registration Statement or supplement to the Prospectus;

          (iii)  advise the selling Holders promptly and, if requested by such
     Persons, confirm such advice in writing, (A) when the Prospectus or any
     Prospectus supplement or post-effective amendment has been filed, and, with
     respect to any applicable Registration Statement or any post-effective
     amendment thereto, when the same has become effective, (B) of any request
     by the Commission for amendments to the Registration Statement or
     amendments or supplements to the Prospectus or for additional information
     relating thereto, (C) of the issuance by the Commission of any stop order
     suspending the effectiveness of the Registration Statement under the Act or
     of the suspension by any state securities commission of the qualification
     of the Transfer Restricted Securities for offering or sale in any
     jurisdiction, or the initiation of any proceeding for any of the preceding
     purposes, (D) of the existence of any fact or the happening of any event
     that makes any statement of a material fact made in the Registration
     Statement, the Prospectus, any amendment or supplement thereto or any
     document incorporated by reference 

                                       8
<PAGE>
 
     therein untrue, or that requires the making of any additions to or changes
     in the Registration Statement in order to make the statements therein not
     misleading, or that requires the making of any additions to or changes in
     the Prospectus in order to make the statements therein, in the light of the
     circumstances under which they were made, not misleading. If at any time
     the Commission shall issue any stop order suspending the effectiveness of
     the Registration Statement, or any state securities commission or other
     regulatory authority shall issue an order suspending the qualification or
     exemption from qualification of the Transfer Restricted Securities under
     state securities or Blue Sky laws, the Company shall use its best efforts
     to obtain the withdrawal or lifting of such order at the earliest possible
     time;

          (iv)   subject to Section 6(c)(i), if any fact or event contemplated
     by Section 6(c)(iii)(D) above shall exist or have occurred, prepare a
     supplement or post-effective amendment to the Registration Statement or
     related Prospectus or any document incorporated therein by reference or
     file any other required document so that, as thereafter delivered to the
     purchasers of Transfer Restricted Securities, the Prospectus will not
     contain an untrue statement of a material fact or omit to state any
     material fact necessary to make the statements therein, in the light of the
     circumstances under which they were made, not misleading;

          (v)    furnish to the Initial Purchasers and, if requested by any
     selling Holder, to such Holder, named in any Registration Statement or
     Prospectus in connection with such sale, if any, before filing with the
     Commission, copies of any Registration Statement or any Prospectus included
     therein or any amendments or supplements to any such Registration Statement
     or Prospectus (including all documents incorporated by reference after the
     initial filing of such Registration Statement), which documents will be
     subject to the review and comment of such Holders in connection with such
     sale, if any, for a period of at least five Business Days, and the Company
     will not file any such Registration Statement or Prospectus or any
     amendment or supplement to any such Registration Statement or Prospectus
     (including all such documents incorporated by reference) to which the
     selling Holders of the Transfer Restricted Securities covered by such
     Registration Statement in connection with such sale, if any, shall
     reasonably object within five Business Days after the receipt thereof. A
     selling Holder shall be deemed to have reasonably objected to such filing
     if such Registration Statement, amendment, Prospectus or supplement, as
     applicable, as proposed to be filed, contains a material misstatement or
     omission or fails to comply with the applicable requirements of the Act;

          (vi)   upon the reasonable request of any selling Holder, promptly
     prior to the filing of any document that is to be incorporated by reference
     into a Registration Statement or Prospectus, provide copies of such
     document to the selling Holders in connection with such sale, if any, make
     the Company's representatives available for discussion of such document and
     other customary due diligence matters, and include such information in such
     document prior to the filing thereof;

          (vii)  in the case of any Shelf Registration, make available at
     reasonable times for inspection by the selling Holders participating in any
     disposition pursuant to such Registration Statement and any attorney or
     accountant retained by such selling Holders, all financial and other
     records, pertinent corporate documents of the Company and cause the
     Company's officers, directors and employees to supply all information
     reasonably requested by any such selling Holder, attorney or accountant in
     connection with such Registration Statement or any post-effective amendment
     thereto subsequent to the filing thereof and prior to its effectiveness, in
     each case as shall reasonably be necessary to enable such persons to
     conduct a reasonable 

                                       9
<PAGE>
 
     investigation within the meaning of Section 11 of the Act; provided,
     however, that the foregoing inspection and information gathering shall be
     coordinated on behalf of the Initial Purchasers and such selling Holders by
     you and on behalf of the other parties, by one counsel designated by and on
     behalf of such other parties as described in Section 7 hereof, provided,
     further, that any records, documents, properties or information that are
     designated by the Company as confidential at the time of delivery of such
     records, documents, properties or information shall be kept confidential by
     such persons, unless (i) such records, documents, properties or information
     are in the public domain or otherwise publicly available, (ii) disclosure
     of such records, documents, properties or information is required by court
     or administrative order or (iii) disclosure of such records, documents,
     properties or information, in the written opinion of counsel to such
     person, is otherwise required by law (including, without limitation,
     pursuant to the requirements of the Act);

          (viii) subject to Section 4(b) hereof, if reasonably requested by
     selling Holders of a majority of Accreted Value of Transfer Restricted
     Securities being sold in connection with such offering, if any, promptly
     include in any Registration Statement or Prospectus, pursuant to a
     supplement or post-effective amendment if necessary, such information as
     such selling Holders may reasonably request to have included therein,
     including, without limitation, information relating to the "Plan of
     Distribution" of the Transfer Restricted Securities; and make all required
     filings of such Prospectus supplement or post-effective amendment as soon
     as practicable after the Company is notified of the matters to be included
     in such Prospectus supplement or post-effective amendment; provided,
     however. that the Company shall not be required to take any action pursuant
     to this Section 6(c)(viii) that would, in the opinion of counsel for the
     Company reasonably satisfactory to the Initial Purchasers, violate
     applicable law;

          (ix)   furnish to each selling Holder in connection with such sale, if
     any, without charge, at least one copy of the Registration Statement, as
     first filed with the Commission, and of each post-effective amendment
     thereto, including financial statements and schedules, and, if the Holder
     so requests in writing, all documents incorporated by reference therein and
     all exhibits (including exhibits incorporated therein by reference);

          (x)    deliver to each selling Holder, without charge, as many copies
     of the Prospectus (including each preliminary prospectus) and any amendment
     or supplement thereto as such Persons reasonably may request; the Company
     hereby consents to the use (in accordance with law and subject to the
     provisions of this Agreement) of the Prospectus and any amendment or
     supplement thereto by each of the selling Holders in connection with the
     offering and the sale of the Transfer Restricted Securities covered by the
     Prospectus or any amendment or supplement thereto;

          (xi)   upon the request of any selling Holder, enter into such
     agreements (including underwriting agreements) and make such
     representations and warranties and take all such other actions in
     connection therewith in order to expedite or facilitate the disposition of
     the Transfer Restricted Securities pursuant to any applicable Registration
     Statement contemplated by this Agreement as may be reasonably requested by
     any Holder of Transfer Restricted Securities in connection with any sale or
     resale pursuant to any applicable Registration Statement and in such
     connection, the Company shall:

          (A)    Upon the request of any selling Holder, furnish (or in the case
       of paragraphs (2) and (3), use its best efforts to cause to be furnished)
       to each selling Holder, upon the 

                                      10
<PAGE>
 
       effectiveness of the Shelf Registration Statement or upon Consummation of
       the Exchange Offer, as the case may be:

               (1)  a certificate, dated such date, signed on behalf of the
          Company by (x) the Chief Executive Officer or President and (y) the
          Chief Financial Officer or Treasurer of the Company, as set forth in
          Section 7(j) of the Purchase Agreement and such other similar matters
          as are customary and as the selling Holders may reasonably request;

               (2)  an opinion, dated the date of Consummation of the Exchange
          Offer, or the date of effectiveness of the Shelf Registration
          Statement, as the case may be, of counsel for the Company covering
          matters similar to those set forth in of Section 7(d) of the Purchase
          Agreement and such other matters as the selling Holders may reasonably
          request, and in any event including a statement to the effect that
          such counsel has participated in conferences with officers of the
          Company and with the independent public accountants for the Company
          concerning the preparation of the Exchange Offer Registration
          Statement or the Shelf Registration Statement, as the case may be, and
          although such counsel has made certain inquiries and investigations in
          connection with such preparation, it is not passing upon and does not
          assume any responsibility for the accuracy or completeness of the
          statements contained in such Registration Statements, except insofar
          as such statements relate to such counsel, and on the basis of the
          foregoing, such counsel's work in connection with this matter did not
          disclose any information that gave such counsel reason to believe that
          the applicable Registration Statement, at the time such Registration
          Statement or any post-effective amendment thereto became effective ,
          or the Prospectus contained in such Registration Statement as of its
          date, and, in the case of the Exchange Offer Registration Statement,
          as of the date of Consummation of the Exchange Offer, contained an
          untrue statement of a material fact or omitted to state a material
          fact required to be stated therein or necessary to make the statements
          therein not misleading; and

               (3)  a customary comfort letter, dated the date of Consummation
          of the Exchange Offer, or as of the date of effectiveness of the Shelf
          Registration Statement, as the case may be, from the Company's
          independent accountants, in the customary form and covering matters of
          the type customarily covered in comfort letters to underwriters in
          connection with underwritten offerings, and meeting the requirements
          set forth in the comfort letters delivered pursuant to Section 7(i) of
          the Purchase Agreement;

          (B)  Set forth in full or incorporated by reference in the
       underwriting agreement, if any, the indemnification provisions and
       procedures of Section 8 hereof with respect to all parties to be
       indemnified pursuant to said Section; and

          (C)  Deliver such other customary documents and certificates as may be
       reasonably requested by the selling Holders to evidence compliance with
       clause (A) above and with any customary conditions contained in any
       agreement entered into by the Company pursuant to this clause (xi).

     If at any time the representations and warranties of the Company set forth
in the certificate contemplated in clause (A)(1) above cease to be true and
correct, the Company shall so advise the Initial Purchasers and the
underwriter(s), if any, and each selling Holder promptly and, if requested by
such Persons, shall confirm such advice in writing;

                                      11
<PAGE>
 
          (xii)  prior to any public offering of Transfer Restricted Securities,
     cooperate with the selling Holders and their counsel in connection with the
     registration and qualification of the Transfer Restricted Securities under
     the securities or Blue Sky laws of such jurisdictions as the selling
     Holders may request and do any and all other acts or things necessary or
     advisable to enable the disposition in such jurisdictions of the Transfer
     Restricted Securities covered by the applicable Registration Statement;
     provided, however, that the Company shall not be required to register or
     qualify as a foreign corporation where it is not now so qualified or to
     take any action that would subject it to the service of process in suits or
     to taxation, other than as to matters and transactions relating to the
     Registration Statement, in any jurisdiction where it is not now so subject;

          (xiii) issue, upon the request of any Holder of Series A Notes covered
     by any Shelf Registration Statement contemplated by this Agreement, Series
     B Notes having an Accreted Value equal to the Accreted Value of Series A
     Notes surrendered to the Company by such Holder in exchange therefor or
     being sold by such Holder; such Series B Notes to be registered in the name
     of such Holder or in the name of the purchaser(s) of such Series B Notes,
     as the case may be; in return, the Series A Notes held by such Holder shall
     be surrendered to the Company for cancellation;

          (xiv)  in connection with any sale of Transfer Restricted Securities
     that will result in such securities no longer being Transfer Restricted
     Securities, cooperate with the selling Holders to facilitate the timely
     preparation and delivery of certificates representing Transfer Restricted
     Securities to be sold and not bearing any restrictive legends; and to
     register such Transfer Restricted Securities in such denominations and such
     names as the selling Holders may request at least two Business Days prior
     to such sale of Transfer Restricted Securities pursuant to such
     Registration Statements;

          (xv)   use its best efforts to cause the disposition of the Transfer
     Restricted Securities covered by the Registration Statement to be
     registered with or approved by such other governmental agencies or
     authorities as may be necessary to enable the seller or sellers thereof to
     consummate the disposition of such Transfer Restricted Securities, subject
     to the proviso contained in clause (xii) above;

          (xvi)  provide a CUSIP number for all Transfer Restricted Securities
     not later than the effective date of a Registration Statement covering such
     Transfer Restricted Securities and provide the Trustee under the Indenture
     with printed certificates for the Transfer Restricted Securities which are
     in a form eligible for deposit with The Depository Trust Company;

          (xvii) otherwise use its best efforts to comply with all applicable
     rules and regulations of the Commission, and make generally available to
     its security holders with regard to any applicable Registration Statement,
     as soon as practicable, a consolidated earnings statement meeting the
     requirements of Rule 158 (which need not be audited) covering a twelve-
     month period beginning after the effective date of the Registration
     Statement (as such term is defined in paragraph (c) of Rule 158 under the
     Act);

          (xviii) (A)  if the Notes have been rated prior to the initial sale
     of such Notes, use its best efforts to confirm that such ratings will apply
     to the Transfer Restricted Securities covered by a Registration Statement,
     or (B) if the Notes were not previously rated, use commercially reasonable
     efforts to cause the Transfer Restricted Securities covered by the
     Registration 

                                      12
<PAGE>
 
     Statement to be rated with the appropriate rating agencies, if so requested
     by the Holders of a majority in Accreted Value of Notes covered thereby or
     the managing underwriter(s), if any;

          (xix)  cause the Indenture to be qualified under the TIA not later
     than the effective date of the first Registration Statement required by
     this Agreement and, in connection therewith, cooperate with the Trustee and
     the Holders to effect such changes to the Indenture as may be required for
     such Indenture to be so qualified in accordance with the terms of the TIA;
     and execute and use its best efforts to cause the Trustee to execute, all
     documents that may be required to effect such changes and all other forms
     and documents required to be filed with the Commission to enable such
     Indenture to be so qualified in a timely manner; and

          (xx)   provide promptly to each Holder upon request each document
     filed with the Commission pursuant to the requirements of Section 13 or
     Section 15(d) of the Exchange Act.

     (d)  Restrictions on Holders. Each Holder agrees by acquisition of a
          -----------------------
Transfer Restricted Security that, upon receipt of the notice referred to in
Section 6(c)(i) or any notice from the Company of the existence of any fact of
the kind described in Section 6(c)(iii)(D) hereof (in each case, a "Suspension
                                                                    ----------  
Notice"), such Holder will forthwith discontinue disposition of Transfer
- ------
Restricted Securities pursuant to the applicable Registration Statement until
(i) such Holder has received copies of the supplemented or amended Prospectus
contemplated by Section 6(c)(iv) hereof, or (ii) such Holder is advised in
writing by the Company that the use of the Prospectus may be resumed, and has
received copies of any additional or supplemental filings that are incorporated
by reference in the Prospectus (in each case, the "Recommencement Date"). Each
                                                   -------------------         
Holder receiving a Suspension Notice hereby agrees that it will either (i)
destroy any Prospectuses, other than permanent file copies, then in such
Holder's possession which have been replaced by the Company with more recently
dated Prospectuses or (ii) deliver to the Company (at the Company's expense) all
copies, other than permanent file copies, then in such Holder's possession of
the Prospectus covering such Transfer Restricted Securities that was current at
the time of receipt of the Suspension Notice.  The time period regarding the
effectiveness of such Registration Statement set forth in Section 3 or 4 hereof,
as applicable, shall be extended by a number of days equal to the number of days
in the period from and including the date of delivery of the Suspension Notice
to the date of delivery of the Recommencement Date.

SECTION 7.     REGISTRATION EXPENSES

     (a)  All expenses incident to the Company's performance of or compliance
with this Agreement will be borne by the Company, regardless of whether a
Registration Statement becomes effective, including without limitation: (i) all
registration and filing fees and expenses; (ii) all fees and expenses of
compliance with federal securities and state Blue Sky or securities laws; (iii)
all expenses of printing (including printing of Prospectuses), messenger and
delivery services and telephone; (iv) all reasonable fees and disbursements of
counsel for the Company and one firm of counsel designated by the Holders of a
majority in Accreted Value of Transfer Restricted Securities to act as counsel
for the Holders in connection therewith; (v) all application and filing fees in
connection with listing the Series B Notes on a national securities exchange or
automated quotation system pursuant to the requirements hereof; and (vi) all
fees and disbursements of independent certified public accountants of the
Company (including the expenses of any special audit and comfort letters
required by or incident to such performance).

     The Company will, in any event, bear its internal expenses (including,
without limitation, all salaries and expenses of its officers and employees
performing legal or accounting duties), the expenses 

                                      13
<PAGE>
 
of any annual audit and the fees and expenses of any Person, including special
experts, retained by the Company.

     (b)  In connection with any Registration Statement required by this
Agreement (including, without limitation, the Exchange Offer Registration
Statement and the Shelf Registration Statement), the Company will reimburse the
Initial Purchasers and the Holders of Transfer Restricted Securities being
tendered in the Exchange Offer and/or resold pursuant to the "Plan of
Distribution" contained in the Exchange Offer Registration Statement or
registered pursuant to the Shelf Registration Statement, as applicable, for the
reasonable fees and disbursements of not more than one counsel, who shall be
Latham & Watkins, New York, New York, unless another firm shall be chosen by the
Holders of a majority in Accreted Value of Transfer Restricted Securities for
whose benefit such Registration Statement is being prepared.

     (c)  Each Holder of Transfer Restricted Securities will pay all
underwriting discounts, if any, and commissions and transfer taxes, if any,
relating to the sale or disposition of such Holder's Transfer Restricted
Securities.

     SECTION 8.     INDEMNIFICATION

     (a)  The Company agrees to indemnify and hold harmless (i) each Holder and
(ii) each person, if any, who controls (within the meaning of Section 15 of the
Act or Section 20 of the Exchange Act) any Holder (any of the persons referred
to in this clause (ii) being hereinafter referred to as a "controlling person")
and (iii) the respective officers, directors, partners, employees,
representatives and agents of any Holder or any controlling person (any person
referred to in clause (i), (ii) or (iii) may hereinafter be referred to as an
"Indemnified Holder"), from and against any and all losses, claims, damages,
 ------------------
liabilities, judgments (including without limitation, any legal or other
expenses incurred in connection with investigating or defending any matter,
including any action that could give rise to any such losses, claims, damages,
liabilities or judgments) caused by any untrue statement or alleged untrue
statement of a material fact contained in any Registration Statement,
preliminary prospectus or Prospectus (or any amendment or supplement thereto)
provided by the Company to any holder or any prospective purchaser of Series B
Notes, or caused by any omission or alleged omission to state therein a material
fact required to be stated therein or necessary to make the statements therein
not misleading, provided, however, that (i) the Company shall not be liable in
any such case to the extent that such loss, claim, damage or liability arises
out of or is based upon any untrue statement or alleged untrue statement or
omission or alleged omission made in a Registration Statement or Prospectus or
in any amendment or supplement thereto or in any preliminary Prospectus relating
to a Shelf Registration in reliance upon and in conformity with written
information pertaining to such Holder and furnished to the Company by or on
behalf of such Holder specifically for inclusion therein and (ii) with respect
to any untrue statement or omission or alleged untrue statement or omission made
in any preliminary Prospectus relating to a Shelf Registration Statement, the
indemnity agreement contained in this subsection (a) shall not inure to the
benefit of any Holder or Broker-Dealer from whom the person asserting any such
losses, claims, damages or liabilities purchased the Transfer Restricted
Securities concerned, to the extent that a Prospectus relating to such
Securities was required to be delivered by such Holder or Broker-Dealer under
the Act in connection with such purchase and any such loss, claim, damage or
liability of such Holder or Broker-Dealer results from the fact that there was
not sent or given to such person, at or prior to the written confirmation of the
sale of such Securities to such person, a copy of the final Prospectus if the
Company has previously furnished copies thereof to such Holder of Broker-Dealer;
provided further, however, that this indemnity agreement will be in addition to
any liability which the Company may otherwise have to such Indemnified Holder.

                                      14
<PAGE>
 
     (b)  Each Holder of Transfer Restricted Securities agrees, severally and
not jointly, to indemnify and hold harmless the Company, and its directors and
officers, and each controlling person, if any, to the same extent as the
foregoing indemnity from the Company to each of the Indemnified Holders, but
only with reference to information relating to such Indemnified Holder furnished
in writing to the Company by such Indemnified Holder expressly for use in any
Registration Statement and, subject to the limitation set forth immediately
preceding this clause, shall reimburse, as incurred, the Company for any legal
or other expenses reasonably incurred by the Company or any such controlling
person in connection with investigating or defending any loss, claim, damage,
liability or action in respect thereof. This indemnity agreement will be in
addition to any liability which such Holder may otherwise have the Company or
any of their controlling persons.

     (c)  In case any action shall be commenced involving any person in respect
of which indemnity may be sought pursuant to Section 8(a) or 8(b) (the
"indemnified party"), the indemnified party shall promptly notify the person
 ----------------- 
against whom such indemnity may be sought (the "indemnifying person") in writing
                                                -------------------
and the indemnifying party shall assume the defense of such action, including
the employment of counsel reasonably satisfactory to the indemnified party and
the payment of all fees and expenses of such counsel, as incurred (except that
in the case of any action in respect of which indemnity may be sought pursuant
to both Sections 8(a) and 8(b), an Indemnified Holder shall not be required to
assume the defense of such action pursuant to this Section 8(c), but may employ
separate counsel and participate in the defense thereof, but the fees and
expenses of such counsel, except as provided below, shall be at the expense of
the Indemnified Holder). Any indemnified party shall have the right to employ
separate counsel in any such action and participate in the defense thereof, but
the fees and expenses of such counsel shall be at the expense of the indemnified
party unless (i) the employment of such counsel shall have been specifically
authorized in writing by the indemnifying party, (ii) the indemnifying party
shall have failed to assume the defense of such action or employ counsel
reasonably satisfactory to the indemnified party or (iii) the named parties to
any such action (including any impleaded parties) include both the indemnified
party and the indemnifying party, and the indemnified party shall have been
advised by such counsel that there may be one or more legal defenses available
to it which are different from or additional to those available to the
indemnifying party (in which case the indemnifying party shall not have the
right to assume the defense of such action on behalf of the indemnified party).
In any such case, the indemnifying party shall not, in connection with any one
action or separate but substantially similar or related actions in the same
jurisdiction arising out of the same general allegations or circumstances, be
liable for the fees and expenses of more than one separate firm of attorneys (in
addition to any local counsel) for all indemnified parties and all such fees and
expenses shall be reimbursed as they are incurred. Such firm shall be designated
in writing by a majority in Accreted Valued Holders, in the case of the parties
indemnified pursuant to Section 8(a), and by the Company, in the case of parties
indemnified pursuant to Section 8(b). The indemnifying party shall indemnify and
hold harmless the indemnified party from and against any and all losses, claims,
damages, liabilities and judgments by reason of any settlement of any action (i)
effected with its written consent or (ii) effected without its written consent
if the settlement is entered into more than twenty business days after the
indemnifying party shall have received a request from the indemnified party for
reimbursement for the fees and expenses of counsel (in any case where such fees
and expenses are at the expense of the indemnifying party) and, prior to the
date of such settlement, the indemnifying party shall have failed to comply with
such reimbursement request. No indemnifying party shall (i) without the prior
written consent of the indemnified party, effect any settlement or compromise
of, or consent to the entry of judgment with respect to, any pending or
threatened action in respect of which the indemnified party is or could have
been a party and indemnity or contribution may be or could have been sought
hereunder by the indemnified party, unless such settlement, compromise or
judgment includes an unconditional release of the indemnified party from all
liability on claims that are or could have been the subject
matter of such 

                                      15
<PAGE>
 
action or (ii) be liable for any settlement of any such action effected without
its written consent (which consent shall not be unreasonably withheld), but if
settled with the consent of the indemnifying party or if there be a final
judgment of the plaintiff in any such action, the indemnifying party agrees to
indemnify and hold harmless any indemnified party from and against any loss or
liability by reason of such settlement or judgment.

     (d)  To the extent that the indemnification provided for in this Section 8
is unavailable to an indemnified party in respect of any losses, claims,
damages, liabilities or judgments referred to therein, then each indemnifying
party, in lieu of indemnifying such indemnified party, shall contribute to the
amount paid or payable by such indemnified party as a result of such losses,
claims, damages, liabilities or judgments (i) in such proportion as is
appropriate to reflect the relative benefits received by the Company, on the one
hand, and the Indemnified Holders, on the other hand, from their sale of
Transfer Restricted Securities or (ii) if the allocation provided by clause
8(d)(i) is not permitted by applicable law, in such proportion as is appropriate
to reflect not only the relative benefits referred to in clause 8(d)(i) above
but also the relative fault of the Company, on the one hand, and of the
Indemnified Holder, on the other hand, in connection with the statements or
omissions which resulted in such losses, claims, damages, liabilities or
judgments, as well as any other relevant equitable considerations. The relative
fault of the Company, on the one hand, and of the Indemnified Holder, on the
other hand, shall be determined by reference to, among other things, whether the
untrue or alleged untrue statement of a material fact or the omission or alleged
omission to state a material fact relates to information supplied by the
Company, on the one hand, or by the Indemnified Holder, on the other hand, and
the parties' relative intent, knowledge, access to information and opportunity
to correct or prevent such statement or omission. The amount paid or payable by
a party as a result of the losses, claims, damages, liabilities and judgments
referred to above shall be deemed to include, subject to the limitations set
forth in the second paragraph of Section 8(a), any legal or other fees or
expenses reasonably incurred by such party in connection with investigating or
defending any action or claim.

     The Company and each Holder agree that it would not be just and equitable
if contribution pursuant to this Section 8(d) were determined by pro rata
allocation (even if the Holders were treated as one entity for such purpose) or
by any other method of allocation which does not take account of the equitable
considerations referred to in the immediately preceding paragraph. The amount
paid or payable by an indemnified party as a result of the losses, claims,
damages, liabilities or judgments referred to in the immediately preceding
paragraph shall be deemed to include, subject to the limitations set forth
above, any legal or other expenses reasonably incurred by such indemnified party
in connection with investigating or defending any matter, including any action
that could have given rise to such losses, claims, damages, liabilities or
judgments. Notwithstanding the provisions of this Section 8, no Holder or its
related Indemnified Holders shall be required to contribute, in the aggregate,
any amount in excess of the amount by which the total received by such Holder
with respect to the sale of its Transfer Restricted Securities pursuant to a
Registration Statement exceeds the amount of any damages which such Holder has
otherwise been required to pay by reason of such untrue or alleged untrue
statement or omission or alleged omission. No person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Act) shall be
entitled to contribution from any person who was not guilty of such fraudulent
misrepresentation. The Holders' obligations to contribute pursuant to this
Section 8(d) are several in proportion to the respective Accreted Value of
Transfer Restricted Securities held by each of the Holders hereunder and not
joint.

                                      16
<PAGE>
 
SECTION 9.     RULE 144A

     The Company hereby agrees with each Holder, for so long as any Transfer
Restricted Securities remain outstanding and during any period in which the
Company is not subject to Section 13 or 15(d) of the Exchange Act, to make
available, upon request of any Holder of Transfer Restricted Securities, to any
Holder or beneficial owner of Transfer Restricted Securities in connection with
any sale thereof and any prospective purchaser of such Transfer Restricted
Securities designated by such Holder or beneficial owner, the information
required by Rule 144A(d)(4) under the Act in order to permit resales of such
Transfer Restricted Securities pursuant to Rule 144A.

SECTION 10.    MISCELLANEOUS

     (a)  Remedies.  The Company acknowledges and agrees that any failure by the
          --------                                                              
Company to comply with its obligations under Sections 3 and 4 hereof may result
in material irreparable injury to the Initial Purchasers or the Holders for
which there is no adequate remedy at law, that it will not be possible to
measure damages for such injuries precisely and that, in the event of any such
failure, the Initial Purchasers or any Holder may obtain such relief as may be
required to specifically enforce the Company's obligations under Sections 3 and
4 hereof.  The Company further agrees to waive the defense in any action for
specific performance that a remedy at law would be adequate.

     (b)  No Inconsistent Agreements. The Company will not, on or after the date
          --------------------------
of this Agreement, enter into any agreement with respect to its securities that
is inconsistent with the rights granted to the Holders in this Agreement or
otherwise conflicts with the provisions hereof. The Company has not previously
entered into any agreement granting any registration rights with respect to its
securities to any Person. The rights granted to the Holders hereunder do not in
any way conflict with and are not inconsistent with the rights granted to the
holders of the Company's securities under any agreement in effect on the date
hereof.

     (c)  Adjustments Affecting the Notes. The Company will not take any action,
          -------------------------------
or permit any change to occur, with respect to the Notes that would materially
and adversely affect the ability of the Holders to Consummate any Exchange
Offer.

     (d)  Amendments and Waivers.  The provisions of this Agreement may not be
          ----------------------                                              
amended, modified or supplemented, and waivers or consents to or departures from
the provisions hereof may not be given unless (i) in the case of Section 5
hereof and this Section 10(d)(i), the Company has obtained the written consent
of Holders of all outstanding Transfer Restricted Securities and (ii) in the
case of all other provisions hereof, the Company has obtained the written
consent of Holders of a majority of the outstanding Accreted Value of Transfer
Restricted Securities (excluding Transfer Restricted Securities held by the
Company of its Affiliates).  Notwithstanding the foregoing, a waiver or consent
to departure from the provisions hereof that relates exclusively to the rights
of Holders whose securities are being tendered pursuant to the Exchange Offer
and that does not affect directly or indirectly the rights of other Holders
whose securities are not being tendered pursuant to such Exchange Offer may be
given by the Holders of a majority of the outstanding Accreted Value of Transfer
Restricted Securities subject to such Exchange Offer.

     (e)  Third Party Beneficiary. The Holders shall be third party
          -----------------------
beneficiaries to the agreements made hereunder between the Company, on the one
hand, and the Initial Purchasers, on the other hand, and shall have the right to
enforce such agreements directly to the extent they may deem such enforcement
necessary or advisable to protect its rights or the rights of Holders hereunder.

                                      17
<PAGE>
 
     (f)  Notices. All notices and other communications provided for or
          -------
permitted hereunder shall be made in writing by hand-delivery, first-class mail
(registered or certified, return receipt requested), telex, telecopier, or air
courier guaranteeing overnight delivery:

          (i)    if to a Holder, at the address set forth on the records of the
     Registrar under the Indenture, with a copy to the Registrar under the
     Indenture; and

          (ii)   if to the Company:

                 Crown Castle International Corp.
                 510 Bering Drive, Suite 500
                 Houston, Texas 77057

                 Telecopier No.:  (713) 570-3150
                 Attention:  Chief Financial Officer

                 With a copy to:

                 Cravath, Swaine & Moore
                 825 Eighth Avenue
                 New York, NY  10019

                 Telecopier No.:  (212) 474-3700
                 Attention:  Kris F. Heinzelman, Esq.

     All such notices and communications shall be deemed to have been duly
given: at the time delivered by hand, if personally delivered; five Business
Days after being deposited in the mail, postage prepaid, if mailed; when receipt
acknowledged, if telecopied; and on the next Business Day, if timely delivered
to an air courier guaranteeing overnight delivery.

     Copies of all such notices, demands or other communications shall be
concurrently delivered by the Person giving the same to the Trustee at the
address specified in the Indenture.

     Upon the date of filing of the Exchange Offer or a Shelf Registration
Statement, as the case may be, notice shall be delivered to Lehman Brothers Inc.
on behalf of the Initial Purchasers (in the form attached hereto as Exhibit A)
and shall be addressed to:  Attention: Compliance Department, 3 World Financial
Center, New York, NY 10285.

     (g)  Successors and Assigns. This Agreement shall inure to the benefit of
          ----------------------
and be binding upon the successors and assigns of each of the parties, including
without limitation and without the need for an express assignment, subsequent
Holders of Transfer Restricted Securities; provided, that nothing herein shall
be deemed to permit any assignment, transfer or other disposition of Transfer
Restricted Securities in violation of the terms hereof or of the Purchase
Agreement or the Indenture. If any transferee of any Holder shall acquire
Transfer Restricted Securities in any manner, whether by operation of law or
otherwise, such Transfer Restricted Securities shall be held subject to all of
the terms of this Agreement, and by taking and holding such Transfer Restricted
Securities such Person shall be conclusively deemed to have agreed to be bound
by and to perform all of the terms and provisions of this Agreement, including
the restrictions on resale set forth in this Agreement and, if applicable, the
Purchase Agreement, and such Person shall be entitled to receive the benefits
hereof.

                                      18
<PAGE>
 
     (h)  Counterparts. This Agreement may be executed in any number of
          ------------
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

     (i)  Headings. The headings in this Agreement are for convenience of
          --------
reference only and shall not limit or otherwise affect the meaning hereof.

     (j)  Governing Law.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
          -------------                                                       
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO THE
CONFLICT OF LAW RULES THEREOF.

     (k)  Severability.  In the event that any one or more of the provisions
          ------------                                                      
contained herein, or the application thereof in any circumstance, is held
invalid, illegal or unenforceable, the validity, legality and enforceability of
any such provision in every other respect and of the remaining provisions
contained herein shall not be affected or impaired thereby.

     (l)  Entire Agreement. This Agreement is intended by the parties as a final
          ----------------      
expression of their agreement and intended to be a complete and exclusive
statement of the agreement and understanding of the parties hereto in respect of
the subject matter contained herein.  There are no restrictions, promises,
warranties or undertakings, other than those set forth or referred to herein
with respect to the registration rights granted with respect to the Transfer
Restricted Securities.  This Agreement supersedes all prior agreements and
understandings between the parties with respect to such subject matter.

                                      19
<PAGE>
 
     IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first written above.

                                          CROWN CASTLE INTERNATIONAL CORP.    
                                                                              
                                                                              
                                                                              
                                          By: /s/ JOHN L. GWYN
                                             ---------------------------------
                                             Name:  John L. Gwyn
                                                  ----------------------------
                                             Title: Executive Vice President
                                                   ---------------------------


Lehman Brothers Inc.



By: /s/ JOHN RUSSELL
   ------------------------------------
   Name:  John Russell
        -------------------------------
   Title: Managing Director
         ------------------------------


Credit Suisse First Boston Corporation



By: /s/ HAROLD H. BOGLE
   ------------------------------------
   Name:  Harold H. Bogle
        -------------------------------
   Title: Managing Director
         ------------------------------

                                      20
<PAGE>
 
                                   EXHIBIT A

                              NOTICE OF FILING OF
                   A/B EXCHANGE OFFER REGISTRATION STATEMENT


To:    Compliance Department
       3 World Financial Center
       New York, NY 10285

From:  Crown Castle International Corp.
       510 Bering Drive, Suite 500
       Houston, Texas  77057
       Re: __% Senior Discount Notes due 2007

Date_______________, 199______

       For your information only (NO ACTION REQUIRED):

Today, ______, 199_, we filed [an A/B Exchange Registration Statement/a Shelf
Registration Statement] with the Securities and Exchange Commission. We
currently expect this registration statement to be declared effective within 
[_______] business days of the date hereof.

<PAGE>
 
                                                                    Exhibit 10.2


                                LOAN AGREEMENT


                                 by and among

                           CASTLE TOWER CORPORATION,

                               as the Borrower,

                            SOCIETY NATIONAL BANK,

                                 as the Agent,

                                      and

                   THE FINANCIAL INSTITUTIONS LISTED HEREIN


                             AS OF APRIL 26, 1995
<PAGE>
 
                               TABLE OF CONTENTS
<TABLE>
 
<S>        <C>                                                            <C>
SECTION 1.   DEFINITIONS..................................................   1
             -----------
     1.1   Definitions....................................................   1
           -----------
     1.2   Other Terms....................................................  17
           -----------
     1.3   Accounting Terms...............................................  18
           ----------------

SECTION 2.   THE LOANS....................................................  18
             ---------
     2.1   The Reducing Commitment and the Reducing Loans.................  18
           ----------------------------------------------
     2.2   The Working Capital Commitment and the Working Capital Loans...  20
           ------------------------------------------------------------
     2.3   The Term Loan..................................................  21
           -------------
     2.4   Making and Conversion/Continuation of the Loans................  21
           -----------------------------------------------
     2.5   The Notes......................................................  23
           ---------
     2.6   Fees...........................................................  24
           ----
     2.7   Prepayment.....................................................  24
           ----------
     2.8   Reserves or Deposit Requirements, Etc..........................  27
           -------------------------------------
     2.9   Tax Law, Increased Costs, Etc..................................  28
           -----------------------------
     2.10  Eurodollar Deposits Unavailable or Interest Rate 
           ------------------------------------------------
           Unascertainable................................................  28
           ---------------
     2.11  Changes in Law Rendering LIBOR Loans Unlawful..................  28
           ---------------------------------------------
     2.12  Funding........................................................  29
           -------
     2.13  Indemnity......................................................  29
           ---------
     2.14  Capital Adequacy...............................................  29
           ----------------
     2.15  Taxes..........................................................  30
           ----- 

SECTION 3.   INTEREST; PAYMENTS...........................................  31
             ------------------
     3.1   Interest.......................................................  31
           --------
     3.2   Manner of Payments.............................................  32
           ------------------ 

SECTION 4.   CLOSING......................................................  33
             -------                                                        
 
SECTION 5.   REPRESENTATIONS AND WARRANTIES OF THE BORROWER...............  33
             ----------------------------------------------
     5.1   Organization and Powers........................................  33
           -----------------------
     5.2   Authorization..................................................  33
           -------------
     5.3   Financial Statements...........................................  34
           --------------------
     5.4   Projections....................................................  34
           -----------
     5.5   Capitalization of the Borrower.................................  34
           ------------------------------
     5.6   Subsidiaries...................................................  35
           ------------
     5.7   Title to Properties; Patents, Trademarks, Etc..................  35
           ---------------------------------------------
     5.8   Litigation; Proceedings........................................  35
           -----------------------
     5.9   Taxes..........................................................  35
           -----
     5.10  Absence of Conflicts...........................................  36
           --------------------
     5.11  Indebtedness...................................................  36
           ------------
     5.12  Compliance.....................................................  36
           ----------
     5.13  Statements Not Misleading......................................  37
           -------------------------
     5.14  Consents or Approvals..........................................  37
           ---------------------
     5.15  Material Contracts and Commitments.............................  37
           ----------------------------------
     5.16  Employee Benefit Plans.........................................  38
           ----------------------
     5.17  Licenses.......................................................  38
           --------
     5.18  Material Restrictions..........................................  39
           ---------------------
</TABLE> 
<PAGE>
 
<TABLE> 
<S>        <C>                                                            <C>
     5.19  Investment Company Act.........................................  39
           ----------------------
     5.20  Absence of Material Adverse Changes............................  39
           -----------------------------------
     5.21  Defaults.......................................................  39
           --------
     5.22  Real Property..................................................  39
           -------------
     5.23  Securities Laws................................................  39
           ---------------
     5.24  Insurance......................................................  40
           ---------
     5.25  Labor Disputes.................................................  40
           --------------
     5.26  Environmental Compliance.......................................  40
           ------------------------
     5.27  Solvency.......................................................  43
           --------
     5.28  Purchase Agreement.............................................  43
           ------------------ 

SECTION 6.   CONDITIONS PRECEDENT TO OBLIGATIONS OF THE BANKS.............  43
             ------------------------------------------------
     6.1   Compliance.....................................................  44
           ----------
     6.2   Security Agreement.............................................  44
           ------------------
     6.3   Pledge Agreement...............................................  44
           ----------------
     6.4   Real Property Matters..........................................  44
           ---------------------
     6.5   Financing Statements...........................................  46
           --------------------
     6.6   Seller Subordination Agreement.................................  46
           ------------------------------
     6.7   Assignment of Seller Escrow Deposit............................  46
           -----------------------------------
     6.8   Consummation of Purchase Agreement.............................  46
           ----------------------------------
     6.9   No Indebtedness................................................  47
           ---------------
     6.10  Opinion of Borrower's and Stockholders' Counsel................  47
           -----------------------------------------------
     6.11  Insurance Certificates.........................................  47
           ----------------------
     6.12  Financial Information..........................................  48
           ---------------------
     6.13  Engineer's Report..............................................  48
           -----------------
     6.14  Borrowing Request, Statement of Application of Proceeds and
           -----------------------------------------------------------
           Acquisition Advance Worksheet..................................  48
           -----------------------------
     6.15  Rate Hedging Obligations.......................................  48
           ------------------------
     6.16  Depository Accounts and Cash Management System.................  48
           ----------------------------------------------
     6.17  Corporate Documents............................................  48
           -------------------
     6.18  Consents and Releases of Liens.................................  49
           ------------------------------
     6.19  Fees and Expenses..............................................  49
           -----------------
     6.20  Legal Approval.................................................  49
           --------------
     6.21  Other Documents................................................  49
           --------------- 

SECTION 7.   AFFIRMATIVE COVENANTS OF THE BORROWER........................  50
             -------------------------------------
     7.1   Use of Proceeds................................................  50
           ---------------
     7.2   Continued Existence; Compliance with Law.......................  50
           ----------------------------------------
     7.3   Insurance......................................................  50
           ---------
     7.4   Obligations and Taxes..........................................  51
           ---------------------
     7.5   Financial Statements and Reports...............................  52
           --------------------------------
     7.6   Notices........................................................  54
           -------
     7.7   Maintenance of Property........................................  55
           -----------------------
     7.8   Information and Inspection.....................................  55
           --------------------------
     7.9   Maintenance of Liens...........................................  55
           --------------------
     7.10  Title To Property..............................................  56
           -----------------
     7.11  Environmental Compliance and Indemnity.........................  56
           --------------------------------------
     7.12  Appraisals.....................................................  57
           ----------
     7.13  Rate Hedging Obligations.......................................  57
           ------------------------
     7.14  Depository Accounts and Cash Management System.................  57
           ----------------------------------------------

SECTION 8.   NEGATIVE COVENANTS OF THE BORROWER...........................  57
             ----------------------------------
</TABLE> 

                                     -ii-
<PAGE>
 
<TABLE> 
<S>        <C>                                                             <C>  
     8.1   Indebtedness...................................................  58
           ------------
     8.2   Liens..........................................................  58
           -----
     8.3   Guaranties.....................................................  58
           ----------
     8.4   Rental and Conditional Sale Obligations........................  58
           ---------------------------------------
     8.5   Real Property Interests........................................  59
           -----------------------
     8.6   Capital Leases.................................................  59
           --------------
     8.7   Capital Expenditures...........................................  59
           --------------------
     8.8   Notes, Accounts Receivable and Claims..........................  59
           -------------------------------------
     8.9   Capital Distributions..........................................  59
           ---------------------
     8.10  Disposal of Property; Mergers; Acquisitions; Reorganizations...  60
           ------------------------------------------------------------
     8.11  Investments....................................................  63
           -----------
     8.12  Amendment of Governing Documents...............................  63
           --------------------------------
     8.13  Financial Covenants............................................  63
           -------------------
     8.14  Management Agreements and Fees.................................  64
           ------------------------------
     8.15  Fiscal Year....................................................  65
           -----------
     8.16  ERISA..........................................................  65
           -----
     8.17  Affiliates.....................................................  65
           ----------
     8.18  Change of Name or Corporate Structure..........................  65
           -------------------------------------
     8.19  Amendments or Waivers..........................................  65
           ---------------------  
     8.20  Issuance or Transfer of Capital Stock..........................  65
           -------------------------------------
     8.21  Change in Business.............................................  66
           ------------------
     8.22  Payments to Stockholders and Affiliates........................  66
           ---------------------------------------
     8.23  Regulation U...................................................  66
           ------------
     8.24  Subordinated Debt..............................................  66
           -----------------
     8.25  Rights of First Refusal and Call Rights........................  66
           ---------------------------------------

SECTION 9.   EVENTS OF DEFAULT............................................  66
             -----------------
     9.1   Non-Payment....................................................  66
           -----------
     9.2   Failure of Performance in Respect of Other Obligations.........  67
           ------------------------------------------------------
     9.3   Breach of Warranty.............................................  67
           ------------------
     9.4   Cross-Defaults.................................................  67
           --------------
     9.5   Assignment for Benefit of Creditors............................  67
           -----------------------------------
     9.6   Bankruptcy.....................................................  67
           ----------
     9.7   Appointment of Receiver; Liquidation...........................  68
           ------------------------------------
     9.8   Judgments......................................................  68
           ---------
     9.9   Impairment of Collateral; Invalidation of any Loan Document....  68
           -----------------------------------------------------------
     9.10  Termination of License or Agreements...........................  68
           ------------------------------------
     9.11  Change of Control..............................................  69
           -----------------
     9.12  Default under Collateral Document..............................  69
           ---------------------------------
     9.13  Condemnation...................................................  69
           ------------
     9.14  Put, Call and Redemption Rights................................  69
           -------------------------------
     9.15  Material Adverse Change........................................  69
           -----------------------

SECTION 10.  REMEDIES.....................................................  69
             --------  
     10.1  Optional Defaults..............................................  69
           -----------------
     10.2  Automatic Defaults.............................................  70
           ------------------
     10.3  Performance by the Banks.......................................  70
           ------------------------
     10.4  Other Remedies.................................................  70
           --------------
     10.5  Enforcement and Waiver by the Banks............................  70
           -----------------------------------
</TABLE> 

                                     -iii-
<PAGE>
 
<TABLE> 
<S>        <C>                                                             <C>  
SECTION 11.  THE AGENT....................................................  71
             ---------
     11.1  Appointment....................................................  71
           -----------
     11.2  Powers.........................................................  71
           ------
     11.3  General Immunity...............................................  71
           ----------------
     11.4  Action on Instructions of the Banks............................  72
           -----------------------------------
     11.5  Employment of Agents and Counsel...............................  72
           --------------------------------
     11.6  Reliance on Documents; Counsel.................................  72
           ------------------------------
     11.7  Agent's Reimbursement and Indemnification......................  72
           -----------------------------------------
     11.8  Rights as a Bank...............................................  73
           ----------------
     11.9  Bank Credit Decision...........................................  73
           --------------------
     11.10  Successor Agent...............................................  73
            --------------- 
     11.11  Ratable Sharing...............................................  74
            ---------------
     11.12  Actions by the Agent and the Banks............................  74
            ----------------------------------

SECTION 12.  MISCELLANEOUS................................................  74
             ------------- 
     12.1  Construction...................................................  74
           ------------
     12.2  Further Assurance..............................................  75
           -----------------
     12.3  Expenses of the Agent and the Banks; Indemnification...........  75
           ----------------------------------------------------
     12.4  Notices........................................................  76
           -------
     12.5  Waiver and Release by the Borrower.............................  77
           ----------------------------------
     12.6  Right of Set Off...............................................  77
           ----------------
     12.7  Successors and Assigns; Participations.........................  77
           --------------------------------------
     12.8  Applicable Law.................................................  79
           --------------
     12.9  Binding Effect and Entire Agreement............................  79
           -----------------------------------
     12.10  Counterparts..................................................  79
            ------------
     12.11  Survival of Agreements........................................  79
            ----------------------
     12.12  Modification..................................................  80
            ------------
     12.13  Separability..................................................  80
            ------------
     12.14  Section Headings..............................................  81
            ----------------
     12.15  Enforcement...................................................  81
            -----------
     12.16  Termination...................................................  81
            -----------
     12.17  Jury Trial Waiver.............................................  82
            -----------------
     12.18  Interest Limitation...........................................  82
</TABLE>

                                     -iv-
<PAGE>
 
                                 LOAN AGREEMENT
                                 --------------


          THIS LOAN AGREEMENT is made and entered into as of April 26, 1995, by
and among CASTLE TOWER CORPORATION, a Delaware corporation (the "Borrower"), the
FINANCIAL INSTITUTIONS listed on the signature pages hereof, and SOCIETY
NATIONAL BANK, as agent (the "Agent").


                                R E C I T A L S:
                                --------------- 


          The Borrower has entered into an agreement to acquire 133 wireless
communication tower sites and related towers and equipment.  The Borrower
desires to borrow up to $21,700,000 on a reducing revolving credit basis, up to
$1,000,000 on a revolving credit basis and $2,300,000 on a term loan basis from
the Banks, the proceeds of which will be used to finance such acquisition, for
short-term seasonal working capital purposes and for permitted acquisitions.


                              A G R E E M E N T S:
                              --------------------


          Accordingly, the Borrower, the Banks and the Agent agree as follows:


 SECTION 1.    DEFINITIONS.
               ----------- 

          1.1  Definitions.  All terms typed with leading capitals are terms
               -----------                                                  
defined in this Agreement.  For the purposes of this Agreement, the terms
defined in this Section 1 shall have the meanings set out below.

          "Acquisition Advance Worksheet" means a worksheet in the form attached
           -----------------------------                                        
hereto as Schedule 1.1 to be properly completed and delivered to the Agent in
          ------------                                                       
advance of the consummation of each Qualified Acquisition.

          "Affiliate" means, with respect to any Person, (a) any other Person
           ---------                                                         
which is directly or indirectly controlled by, under common control with or
controlling the first specified Person; (b) a Person owning beneficially or
controlling 5% or more of the equity interest in such other Person; (c) any
officer, director or partner of such other Person; or (d) any spouse or relative
(by blood, adoption or marriage) of any such individual Person.  
<PAGE>
 
The term "control" means possession, directly or indirectly, of the power to
direct or cause the direction of the management and policies of a Person whether
through the ownership of voting securities or partnership interests, by contract
or otherwise.

          "Annualized Operating Cash Flow" means, as of any date of
           ------------------------------                          
determination, Operating Cash Flow for the fiscal quarter then ended or most
recently ended multiplied by four.

          "Applicable Margin" means, as of any date of determination, the
           -----------------                                             
percentage determined from the following table based upon the ratio of Total
Debt outstanding on such date to Operating Cash Flow for the four quarter period
then most recently ended:

<TABLE>
<CAPTION>
 
Total Debt to          Applicable Margin   Applicable Margin
Operating Cash         for Base Rate       for LIBOR Loans:
Flow for last four     Loans:              ---------------   
quarters:              ----- 
- --------
<S>                    <C>                 <C>
Greater than or        2.00%               3.50%             
equal to 5.0:1.0:                                            
                                                             
Greater than or        1.50%               3.00%             
equal to 4.0:1.0                                             
but less than                                                
5.0:1.0:                                                     
                                                             
Less than 4.0 to       1.00%               2.50%              
1.0:
</TABLE>

          "Asset Sale" means the sale by the Borrower to any Person of any
           ----------                                                     
assets of the Borrower, other than (i) the sale of assets with an aggregate
value which does not exceed in any fiscal year an amount equal to $100,000 and
(ii) the sale in the ordinary course of business of assets held for resale in
the ordinary course of business or the trade in or replacement of assets in the
ordinary course of business or the disposition of any asset which, in the good
faith exercise of its business judgment, the Borrower determines is no longer
useful in the conduct of its business.

          "Banking Day" means a day on which the main office of the Agent is
           -----------                                                      
open to the public for the transaction of business, and on which, with respect
to any LIBOR Loan, banks are open for business in London, England, and quoting
deposit rates for dollar deposits.

          "Banks" means the financial institutions listed on the signature pages
           -----                                                                
of this Agreement and their respective successors and assigns as permitted
hereunder.

                                      -2-
<PAGE>
 
          "Base Rate" means the rate of interest determined and publicly
           ---------                                                    
announced by the Agent from time to time as its prime rate at its main office in
Cleveland, Ohio.  The prime rate functions as a reference rate index, and the
Agent may charge other borrowers more or less than the prime rate.  The Base
Rate will automatically change as and when such prime rate changes.

          "Base Rate Loans" means those Reducing Loans and Working Capital Loans
           ---------------                                                      
described in Sections 2.1 and 2.2 hereof on which the Borrower shall pay
interest at a rate based on the Base Rate.

          "Benefit Arrangement" means any pension, profit-sharing, thrift, or
           -------------------                                               
other retirement plan, medical, hospitalization, vision, dental, life,
disability or other insurance or benefit plan, deferred compensation, stock
ownership, stock purchase, stock option, performance share, bonus, fringe
benefit, savings or other incentive plan, severance plan or other similar plan,
agreement, arrangement or understanding, to which the Borrower or any member of
the Controlled Group is, or in the preceding six years was, required to
contribute on behalf of its employees or directors, whether or not such plan,
agreement, arrangement or understanding is subject to ERISA.

          "Capital Distribution" means any payment or distribution made,
           --------------------                                         
liability incurred or other consideration given for the purchase, acquisition,
redemption or retirement of any capital stock, partnership interest or other
equity interest of a Person or as a dividend, return of capital or other payment
or distribution of any kind to a stockholder or partner of such Person (other
than any stock dividend or stock split or similar distribution payable only in
capital stock of such Person) in respect of such Person's capital stock or
partnership interests.

          "Capital Expenditures" means any payments which are made by a Person
           --------------------                                               
for or in connection with the rental, lease, purchase, construction or use of
any real or personal property the value or cost of which, under GAAP, should be
capitalized and appear on such Person's balance sheet in the category of
property, plant or equipment, without regard to the manner in which such
payments or the instrument pursuant to which they are made are characterized by
such Person or any other Person; provided, however, that the capitalized portion
                                 --------  -------                              
of the purchase price payable pursuant to the Purchase Agreement or a Qualified
Acquisition shall not constitute a Capital Expenditure.

          "Capitalized Lease Obligations" means, as to any Person, the
           -----------------------------                              
obligations of such Person to pay rent or other amounts under leases of, or
other agreements conveying the right to use real or personal property, which
obligations are required 

                                      -3-
<PAGE>
 
to be classified and accounted for as capital leases on a balance sheet of such
Person, prepared in accordance with GAAP.

          "Closing" and "Closing Date" have the meanings assigned to them in
           -------       ------------                                       
Section 4.

          "Code" means the Internal Revenue Code of 1986, as amended, or any
           ----                                                             
successor statute thereto.

          "Collateral Documents" means all promissory notes, letters of credit,
           --------------------                                                
agreements, assignments, guaranties, mortgages, financing statements,
certificates and other instruments and documents which are required by this
Agreement or any other Collateral Document to be executed or delivered by or on
behalf of the Borrower, Holdco, the Sellers, the Stockholders or any other
Person.

          "Commitments" means the Reducing Commitment and the Working Capital
           -----------                                                       
Commitment, and "Commitment" means either of such Commitments.
                 ----------                                   

          "Controlled Group" means a controlled group of entities which are
           ----------------                                                
treated as a single employer under Sections 414(b), 414(c) or 414(m) of the Code
of which the Borrower is a part.

          "Corporate Development Expense" means any expense of the Borrower
           -----------------------------                                   
incurred in connection with the pursuit of new acquisition business and related
activities, including, without limitation, travel and entertainment expense,
professional fees, due diligence costs and overhead allocable to such
activities.

          "Debt Service" means, for any period, the sum of (a) all scheduled
           ------------                                                     
Reducing Commitment reductions under Section 2.1(b) during such period, (b) all
principal payments required to be made by the Borrower on the Term Loans
pursuant to Section 2.3(b) during such period, (c) all principal payments
required to be made by the Borrower on Total Debt, other than the Loans, but
including, without limitation, the PCI Debt, Seller Debt and Capitalized Lease
Obligations, during such period, and (d) all cash interest payments on, and fees
in respect of, Total Debt, and all fees in respect of the Letters of Credit,
required to be made by the Borrower during such period.

          "Default Interest Rate" means, as of any date, a rate of interest
           ---------------------                                           
equal to the rate of interest otherwise applicable to a Base Rate Loan pursuant
to Section 3.1(a) as of such date plus 2% per annum.

          "Deferred Interest" has the meaning assigned to it in Section 3.1(d).
           -----------------                                                   

                                      -4-
<PAGE>
 
          "Discount Rate" means, with respect to a prepayment or conversion of a
           -------------                                                        
LIBOR Loan on a date other than the last day of its Interest Period, a rate
equal to the interest rate (as of the date of prepayment or conversion) on
United States Treasury obligations in a like amount as such Loan and with a
maturity approximately equal to the period between the prepayment or conversion
date and the last day of the Interest Period of such Loan, as determined by the
Agent.

          "Division A Acquisition" means an acquisition by the Borrower of
           ----------------------                                         
wireless communications towers based on land or the top of buildings, or of
management agreements pursuant to which the Borrower acquires the right to
manage the leasing or licensing of space for wireless communications on the tops
of buildings, or of all of the equity interests of an entity which owns or
leases such towers or manages such roof tops, where the total Purchase Price of
such acquisition is equal to or greater than the product of 7.5 times the most
recent twelve months operating cash flow, as reasonably determined by the Agent,
of the towers or the management agreements, as the case may be, being acquired
for the twelve month period most recently ended prior to the closing of such
acquisition.  Any construction, purchase or other acquisition by the Borrower of
a Tower from the proceeds of a Capital Expenditure made by the Borrower pursuant
to the last sentence of Section 8.7 shall be deemed to be a Division A
Acquisition.

          "Division B Acquisition" means the acquisition by the Borrower of
           ----------------------                                          
substantially all of the assets of Spectrum Engineering, Inc. and any
acquisition by the Borrower of wireless communications towers based on land or
the top of buildings, or of management agreements pursuant to which the Borrower
acquires the right to manage the leasing or licensing of space for wireless
communications on the tops of buildings, or of all of the equity interests of an
entity which owns or leases such towers or manages such roof tops, where the
total Purchase Price of such acquisition is less than the product of 7.5 times
the most recent twelve months operating cash flow, as reasonably determined by
the Agent, of the towers or the management agreements, as the case may be, being
acquired for the twelve month period most recently ended prior to the closing of
such acquisition.

          "Environmental Claim" means, with respect to any Person, any written
           -------------------                                                
or oral notice, claim, demand, request for information, citation, summons, order
or other communication (each, a "claim") by any other Person alleging or
                                 -----                                  
asserting the liability of the recipient of such claim for investigatory costs,
cleanup costs, governmental response costs, damages to natural resources or
other Property or health, personal injuries, fines or penalties arising out of,
based on or resulting from (a) the presence or Release of any Hazardous Material
at or from any 

                                      -5-
<PAGE>
 
location, whether or not owned by such Person, or (b) any violation, or alleged
violation, of any Environmental Law. The term "Environmental Claim" shall
include, without limitation, any claim by any governmental authority for
enforcement, cleanup, removal, response, remedial or other actions or damages
pursuant to any applicable Environmental Law, and any claim by any third party
seeking damages, contribution, indemnification, cost recovery, compensation or
injunctive relief resulting from the presence or Release of Hazardous Materials
or arising from alleged injury or threat of injury to the environment.

          "Environmental Laws" means all provisions of law, statutes,
           ------------------                                        
ordinances, rules, regulations, permits, licenses, judgments, writs,
injunctions, decrees, orders, awards and standards promulgated by the government
of the United States of America or by any state or municipality thereof or by
any court, agency, instrumentality, regulatory authority or commission of any of
the foregoing regulating, relating to or imposing liability or a standard of
conduct concerning the environment or regulating the emission, release or
discharge of substances into the environment.

          "ERISA" means the Employee Retirement Income Security Act of 1974, as
           -----                                                               
amended, and the regulations thereunder.

          "Event of Default" means any of the events specified in Section 9.
           ----------------                                                 

          "Excess Cash Flow" means, as of any date of determination, Operating
           ----------------                                                   
Cash Flow for the four quarter period then most recently ended less the sum
(without duplication) of (a) all Debt Service payments made in such period, (b)
income taxes paid in such period, (c) Capital Expenditures, excluding proceeds
of casualty insurance policies reasonably and promptly applied to replace
insured assets, paid in cash during such fiscal year to the extent permitted
pursuant to Section 8.7, (d) Capitalized Lease Obligation payments made during
such period to the extent permitted pursuant to Section 8.6, and (e) the excess,
if any, in the Borrower's Working Capital as of the end of such fiscal year over
its Working Capital as of the end of the prior fiscal year.

          "Extraordinary Items" means, to the extent deducted in calculating Net
           -------------------                                                  
Earnings, (a) gains or losses from sales, exchanges and other dispositions of
property not in the ordinary course of business and (b) gains or losses from
sales, exchanges and other dispositions of any Tower, Land Lease Agreement or
management agreement in respect of a Tower.

          "FAA" means the Federal Aviation Administration or any governmental
           ---                                                               
authority at any time substituted therefor.

                                      -6-
<PAGE>
 
          "Fixed Charge Coverage Ratio" means, as of any date of determination,
           ---------------------------                                         
the ratio of Annualized Operating Cash Flow as of such date to Historical Fixed
Charges as of such date.

          "GAAP" means generally accepted accounting principles in effect from
           ----                                                               
time to time in the United States, consistently applied.

          "Guarantor" means one who pledges its credit or property in any
           ---------                                                     
manner, or otherwise becomes responsible for the payment or other performance of
the indebtedness, contract or other obligation of another Person and includes
(without limitation) any guarantor (whether of payment or of collection),
surety, co-maker, endorser or one who agrees conditionally or otherwise to make
any purchase, loan or investment in order thereby to enable another to prevent
or correct a default of any kind and one who has endorsed (otherwise than for
collection or deposit in the ordinary course of business), or has discounted
with recourse or agreed (contingently or otherwise) to purchase or repurchase or
otherwise acquire or become liable for, any Indebtedness or who has entered into
any agreement for the purchase or other acquisition of any product, materials or
supplies, or for the making of shipments, or for the payment for services, if in
any such case payment therefor is to be made regardless of the nondelivery of
the product, materials or supplies or the non-furnishing of the services.

          "Guaranty" has the meaning assigned to it in Section 6.3.
           --------                                                

          "Hazardous Material" means, collectively, (a) any petroleum or
           ------------------                                           
petroleum products, flammable materials, explosives, radioactive materials,
asbestos, urea formaldehyde foam insulation, and transformers or other equipment
that contain polychlorinated biphenyls ("PCBs"), (b) any chemicals or other
                                         ----                              
materials or substances that are now or hereafter become defined as or included
in the definition of "hazardous substances", "hazardous wastes", "hazardous
materials", "extremely hazardous wastes", "restricted hazardous wastes", "toxic
substances", "toxic pollutants", "contaminants", "pollutants" or words of
similar import under any Environmental Law and (c) any other chemical or other
material or substance, exposure to which is now or hereafter prohibited, limited
or regulated under any Environmental Law.

          "Historical Fixed Charges" means, as of any date of determination, the
           ------------------------                                             
sum (without duplication) of the aggregate amount of (a) all Debt Service
payments required to be made during the four quarter period then ended or most
recently ended, (b) Capital Expenditures made by the Borrower during such four
quarter period (other than Capital Expenditures made pursuant to 

                                      -7-
<PAGE>
 
the last sentence of Section 8.7), and (c) income taxes paid by the Borrower
during such four quarter period.

          "Holdco" means Castle Tower Holding Corp., a Delaware corporation
           ------                                                          
which owns all of the issued and outstanding capital stock of the Borrower.

          "Holdco Pledge Agreement" has the meaning assigned to it in Section
           -----------------------                                           
6.3.

          "Indebtedness" of any Person means, without duplication, (a) all
           ------------                                                   
obligations of such Person for borrowed money or with respect to deposits or
advances of any kind, (b) all obligations of such person evidenced by bonds,
debentures, notes or similar instruments, (c) all obligations of such Person
upon which interest charges are customarily paid, (d) all obligations of such
Person under conditional sale or other title retention agreements relating to
assets purchased by such Person, (e) all obligations of such Person issued or
assumed as the deferred purchase price of property or services (excluding trade
accounts payable and accrued expenses arising in the ordinary course of business
and not more than ninety days past due), (f) all Indebtedness of others secured
by (or for which the holder of such Indebtedness has an existing right,
contingent or otherwise, to be secured by) any Lien on property owned or
acquired by such Person, whether or not the obligations secured thereby have
been assumed by such Person, (g) all obligations or liabilities in respect of
which such Person is a Guarantor, (h) all Capitalized Lease Obligations of such
Person, (i) all Rate Hedging Obligations, and (j) all obligations of such Person
as an account party to reimburse any bank or any other Person in respect of
letters of credit or bankers' acceptances.  The Indebtedness of any Person shall
include any recourse Indebtedness of any partnership in which such Person is a
general partner.

          "Interest Period" means, with respect to any LIBOR Loan, a period of
           ---------------                                                    
one, two or three months, selected by the Borrower, commencing on the date such
Loan is made, continued or converted and ending on the last day of such period.
Whenever the last day of an Interest Period would otherwise occur on a day other
than a Banking Day, the last day of such Interest Period shall occur on the next
succeeding Banking Day; provided, however, that if such extension of time would
                        --------  -------                                      
cause the last day of such Interest Period to occur in the next calendar month,
the last day of such Interest Period shall occur on the next preceding Banking
Day.  The Borrower shall not select any Interest Period which extends beyond any
date on which a payment is required to be made pursuant to Section 2.1(b) or
Section 2.2(d) unless the sum of the amount available to be drawn under the
Reducing Commitment plus the aggregate principal balance of all Base Rate Loans
and all LIBOR Loans with Interest Periods 

                                      -8-
<PAGE>
 
ending prior to such date is at least equal to the maximum amount that is
required to be paid on such date.

          "Land Lease Agreement" means each lease for real property on which the
           --------------------                                                 
Borrower owns, operates or maintains a Tower.

          "Letters of Credit" has the meaning assigned to it in Section 2.1(d).
           -----------------                                                   

          "Leverage Ratio" means, as of any date of determination, the ratio of
           --------------                                                      
Total Debt as of such date to Annualized Operating Cash Flow as of such date;
provided, however, that (a) solely for purposes of calculating the Leverage
- --------  -------                                                          
Ratio in determining the Borrower's compliance with the financial covenant set
forth in Section 8.13(a), the PCI Debt shall not be included in Total Debt and
(b) for purposes of completing the Acquisition Advance Worksheet in connection
with any Qualified Acquisition the PCI Debt shall not be included in Total Debt.

          "LIBOR" means the average (rounded upward to the nearest 1/16th of 1%)
           -----                                                                
of the per annum rates at which deposits in immediately available funds in
United States dollars for the relevant Interest Period and in the amount of the
LIBOR Loan to be disbursed or to remain outstanding during such Interest Period,
as the case may be, are offered to the Agent by prime banks in any Eurodollar
market reasonably selected by the Agent, determined as of 11:00 a.m. London time
(or as soon thereafter as practicable), two Banking Days prior to the beginning
of the relevant Interest Period.

          "LIBOR Loans" means those Reducing Loans and Working Capital Loans
           -----------                                                      
described in Sections 2.1 and 2.2 hereof on which the Borrower shall pay
interest at a rate based on the applicable LIBOR Rate.

          "LIBOR Prepayment Premium" means, with respect to the prepayment or
           ------------------------                                          
conversion of any LIBOR Loan or any other receipt or recovery of any LIBOR Loan
prior to the end of the applicable Interest Period, whether by voluntary
prepayment, acceleration, conversion to a Base Rate Loan or otherwise, an amount
equal to the sum of (a) the product of (i) the excess, if any, of the rate of
interest then applicable to such Loan pursuant to Section 3.1 at the time of
such prepayment or conversion over LIBOR calculated as of such date, multiplied
by (ii) the principal amount so prepaid, converted or accelerated, as the case
may be, multiplied by (iii) a fraction, the numerator of which is the number of
days remaining in the related Interest Period and the denominator of which is
360 (taking into consideration the applicable compounding for the frequency of
installment payments of the Loans being prepaid), plus (b) out-of-pocket costs
and 

                                      -9-
<PAGE>
 
expenses incurred by the Banks and the Agent with respect to such prepayment.

          "LIBOR Rate" means a rate per annum equal to the quotient obtained
           ----------                                                       
(rounded upwards, if necessary, to the nearest 1/100th of 1%) by dividing (a)
the applicable LIBOR by (b) 1.00 minus the LIBOR Reserve Percentage.

          "LIBOR Reserve Percentage" means for any day that percentage
           ------------------------                                   
(expressed as a decimal) which is in effect on such day, as prescribed by the
Board of Governors of the Federal Reserve System (or any successor) for
determining the maximum reserve requirement (including, without limitation, all
basic, supplemental, marginal and other reserves and taking into account any
transitional adjustments or other scheduled changes in reserve requirements) for
a member bank of the Federal Reserve System in respect of Eurocurrency
Liabilities (as that term is defined in Regulation D of the Board of Governors
of the Federal Reserve System, as in effect from time to time).  The LIBOR Rate
shall be adjusted automatically on and as of the effective date of any change in
the LIBOR Reserve Percentage.

          "License" means any license, authorization, permit, consent,
           -------                                                    
franchise, ordinance, registration, certificate, agreement or other right filed
with, granted by, or entered into by a federal, state or local governmental
authority which permits or authorizes the construction or maintenance of a Tower
or the use of a Tower for wireless communications.

          "License Agreement" means the License Agreement dated as of January
           -----------------                                                 
10, 1995, among the Sellers and the Borrower.

          "Licensing Authority" means a governmental authority which has granted
           -------------------                                                  
a License.

          "Lien" as applied to the property of any Person means: (a) any
           ----                                                         
mortgage, lien, pledge, charge, lease constituting a Capitalized Lease
Obligation, conditional sale or other title retention agreement, or other
security interest or encumbrance of any kind in respect of any property of such
Person, or upon the income or profits therefrom; (b) any arrangement, express or
implied, under which any property of such Person is transferred, sequestered or
otherwise identified for the purpose of subjecting the same to the payment of
Indebtedness in priority to the payment of the general, unsecured creditors of
such person; (c) the filing of, or any agreement to give, any financing
statement under the Uniform Commercial Code or its equivalent of any
jurisdiction in respect of Indebtedness; and (d) in the case of securities or
other equity interests, any purchase option, call or similar right of a third
party with respect to such securities or other equity interests.

                                     -10-
<PAGE>
 
          "Loans" means the Reducing Loans, all amounts drawn under any Letter
           -----                                                              
of Credit (which amounts shall be deemed to be Reducing Loans) and not repaid,
the Working Capital Loans and the Term Loans.

          "Majority Banks" means, at any time, the Agent and Banks holding at
           --------------                                                    
least 66 2/3% of the then aggregate unpaid principal amount of the Notes and the
face amount of the outstanding Letters of Credit, or, if no principal amount of
the Notes or any Letter of Credit is then outstanding, the Agent and Banks
having at least 66 2/3% of the Commitments.

          "Management Agreement" means the Management Agreement dated as of
           --------------------                                            
January 1, 1995, among Pittencrieff Communications, Inc. and the Borrower.

          "Material Adverse Effect" means a material adverse effect upon or
           -----------------------                                         
change in (a) the properties, assets, business, operations, financial condition,
prospects, liabilities or capitalization of the Borrower or on the ability of
the Borrower to conduct its business or to own or maintain its Material Towers,
(b) the ability of the Borrower or any party to a Collateral Document (other
than the Agent and the Banks) to perform its obligations hereunder or under any
other Collateral Document to which it is a party, (c) the validity or
enforceability of this Agreement, any Note or any other Collateral Document, or
(d) the rights or remedies of the Agent or the Banks under this Agreement, the
Notes or any other Collateral Document or at law or in equity or the value of
any material collateral granted to the Agent, for the benefit of the Banks,
pursuant to any Collateral Document.

          "Material Towers" means, as of any date of determination, any Tower or
           ---------------                                                      
any group or set of Towers wheresoever located to which more than 10% of the
Operating Cash Flow for any of the immediately prior four fiscal quarters is
attributable.

          "Mortgages" has the meaning assigned to it in Section 6.4.
           ---------                                                

          "Net Earnings" means the net income (or deficit) of the Borrower for
           ------------                                                       
the period involved, after taxes, if any, and after all proper charges and
reserves (excluding, however, Extraordinary Items), all as determined in
accordance with GAAP.

          "Notes" means the Reducing Notes, the Working Capital Notes, the Term
           -----                                                               
Notes and any notes issued in connection with the issuance of a Letter of
Credit.

          "Obligation" means any obligation of the Borrower (a) to pay to the
           ----------                                                        
Banks the principal of and interest on the Notes in 

                                     -11-
<PAGE>
 
accordance with the terms thereof, including, without limitation, any interest
accruing after the date of any filing by the Borrower of any petition in
bankruptcy or the commencing of any bankruptcy, insolvency or similar
proceedings with respect to the Borrower, regardless of whether such interest is
allowable as a claim in any such proceeding; (b) in respect of the contingent
liability of the Borrower under all outstanding Letters of Credit, (c) in
respect of any Rate Hedging Obligations owing to any Bank or Affiliate of any
Bank; (d) to pay, satisfy or perform any other agreement, liability or
obligation of the Borrower or any other Person to the Agent or any Bank, arising
under this Agreement or any Collateral Document, whether now existing or
hereafter incurred by reason of future advances or otherwise, matured or
unmatured, direct or contingent, joint or several, including any extensions,
modifications or renewals thereof and substitutions therefor, and including
without limitation all fees, indemnification amounts, costs and expenses,
including interest thereon and reasonable attorneys' fees, incurred by the Agent
or any Bank for the protection and preservation or enforcement of its rights and
remedies arising hereunder or under the Collateral Documents; (e) to repay to
the Agent and the Banks all amounts advanced at any time by the Agent or the
Banks hereunder or under any Collateral Document, including, without limitation,
advances for principal or interest payments to prior secured parties,
mortgagees, or lienors or other Persons, or for taxes, levies, insurance, rent
or repairs to, or maintenance or storage of, any of the property of the
Borrower; (f) to perform any covenant or agreement made with the Agent or the
Banks pursuant to this Agreement or any Collateral Document; (g) to take any
other action in respect of any other liability of any nature of the Borrower to
the Agent or the Banks under this Agreement or any Collateral Document; or (h)
any renewal, continuation or extension of any of the foregoing.

          "Operating Cash Flow" means, during any period, Net Earnings for such
           -------------------                                                 
period (excluding, to the extent included in Net Earnings, any Extraordinary
Items and the effect of any exchange of space on a tower for non-cash
consideration, such as merchandise or services), minus the sum of any interest
                                                 -----                        
and other investment income during such period, plus the sum of, without
                                                ----                    
duplication, (a) depreciation on or obsolescence of fixed or capital assets and
amortization of intangibles and leasehold improvements for such period, plus (b)
                                                                        ----    
any amounts paid by the Borrower in such period in respect of Rate Hedging
Obligations to the extent such amounts were deducted in calculating Net
Earnings, plus (c) cash interest accrued and paid during such period, plus (d)
          ----                                                        ----    
federal and state income taxes accrued and paid during such period (exclusive of
any such taxes resulting from any Extraordinary Items), plus (e) non-recurring
                                                        ----                  
costs paid in such period in connection with the Purchase Agreement or Qualified
Acquisitions and approved by the Agent, to the extent that such costs were paid
from equity contributions or the 

                                     -12-
<PAGE>
 
proceeds of any Loan. For purposes of calculating Operating Cash Flow for any
quarter included within the four quarter period ending March 31, 1996, an amount
equal to the lesser of $75,000 or Corporate Development Expense actually accrued
and paid during such quarter shall be added back to Net Earnings (to the extent
deducted in calculating Net Earnings); provided, however, that in no event shall
                                       --------  -------
more that $250,000 of Corporate Development Expense be added back pursuant to
this sentence for the four quarter period ending March 31, 1996. In addition,
for purposes of calculating Operating Cash Flow for any period, the acquisition
pursuant to the Purchase Agreement, each other Qualified Acquisition and each
sale or other disposition by the Borrower of any Towers and related assets,
whether by sale of stock or assets, which occurs during such period, shall be
deemed to have occurred on the first day of such period. Accordingly, the
operating cash flow received by the seller of the Towers and related assets, or
of a management agreement in respect thereof, acquired pursuant to the Purchase
Agreement and each Qualified Acquisition shall be included for the entire period
and the Operating Cash Flow relating to any Towers and related assets, or of a
management agreement in respect thereof, sold or otherwise disposed of during
such period shall be excluded from the calculation of Operating Cash Flow for
the entire period.

          "PBGC" means the Pension Benefit Guaranty Corporation or any
           ----                                                       
governmental authority at any time substituted therefor.

          "PCI Debt" means the Indebtedness of the Borrower to the Sellers
           --------                                                       
evidenced by (a) the unsecured Promissory Note dated January 10, 1995, in the
original principal amount of $1,050,957 and (b) the secured, non-recourse
Promissory Note dated April 27, 1995, in an original principal amount not to
exceed $1,000,000.

          "Pension Plan" means an employee pension benefit plan as defined in
           ------------                                                      
Section 3(2) of ERISA which is subject to the provisions of Section 302 or Title
IV of ERISA or Section 412 of the Code.

          "Permitted Lien" means any of the following Liens:
           --------------                                   

          (a)  Liens for taxes or assessments and similar charges, which are
either not delinquent or being contested diligently and in good faith by
appropriate proceedings, and as to which the Borrower has set aside adequate
reserves on its books and which do not entail any risk of loss, forfeiture,
foreclosure or sale of the property subject thereto;

          (b)  statutory Liens, such as mechanic's, materialman's,
warehouseman's, landlord's, artisan's, workman's, contractor's, carrier's or
other like Liens, (i) incurred in good faith in the ordinary course of business,
(ii) which are either not delinquent or are being contested diligently and in
good 

                                     -13-
<PAGE>
 
faith by appropriate proceedings, (iii) as to which the Borrower has set aside
adequate reserves upon its books or bonded satisfactorily to the Agent and (iv)
which do not entail any risk of loss, forfeiture, foreclosure or sale of the
property subject thereto;

          (c)  encumbrances consisting of zoning restrictions, easements,
licenses, reservations, provisions, covenants, conditions, waivers, restrictions
on the use of property or minor irregularities of title, provided that none of
                                                         --------             
such encumbrances materially impairs the use or value of any property in the
operation of the Borrower's business;

          (d)  Liens securing conditional sale, rental or purchase money
obligations permitted under Section 8.4, but only in the property which is the
subject of such obligations;

          (e)  Liens arising under or pursuant to this Agreement or any
Collateral Document or otherwise securing any Obligation;

          (f)  Liens in respect of judgments or awards with respect to which the
Borrower is, in good faith, prosecuting an appeal or proceeding for review and
with respect to which a stay of execution upon such appeal or proceeding for
review has been secured, and as to which judgments or awards the Borrower has
established adequate reserves on its books or has bonded in a manner
satisfactory to the Agent;

          (g)  pledges or deposits made in the ordinary course of business to
secure payment of worker's compensation, or to participate in any fund in
connection with worker's compensation, unemployment insurance, old-age pensions
or other social security programs;

          (h)  Liens granted to secure the performance of letters of credit,
bids, tenders, contracts, leases, public or statutory obligations, surety,
customs, appeal and performance bonds and other similar obligations to the
extent permitted herein and not incurred in connection with the borrowing of
money, the obtaining of advances or the payment of the deferred purchase price
of any property; and

          (i)  any other Liens listed on Exhibit H hereto or to which the
                                         ---------                       
Majority Banks have consented in writing.

          "Person" includes natural persons, governmental agencies and
           ------                                                     
authorities, corporations, business trusts, associations, companies, limited
liability companies, joint ventures and partnerships.

                                     -14-
<PAGE>
 
          "Plan" means any employee benefit plan, as defined under Section 3(3)
           ----                                                                
of ERISA, established or maintained by the Borrower or any member of the
Controlled Group or any such Plan to which the Borrower or any member of the
Controlled Group is, or in the last six years was, required to contribute on
behalf of its employees.

          "Pledge Agreements" means the Holdco Pledge Agreement and the
           -----------------                                           
Stockholder Pledge Agreement.

          "Possible Default" means an event, condition, situation or thing which
           ----------------                                                     
constitutes, or which with the lapse of any applicable grace period or the
giving of notice or both would constitute, an Event of Default.

          "Projected Debt Service" means, as of any date of determination, the
           ----------------------                                             
sum of (a) all scheduled Reducing Commitment reductions under Section 2.1(b)
during the four quarter period following the end of the fiscal quarter then most
recently ended, (b) all principal payments required to be made by the Borrower
under Section 2.3(b) on the Term Loans during such subsequent four quarter
period, (c) all principal payments required to be made by the Borrower on Total
Debt, other than the Loans, but including, without limitation, the PCI Debt,
Seller Debt and Capitalized Lease Obligations, during such subsequent four
quarter period, and (d) all cash interest payments and payments of fees on Total
Debt required to be made by the Borrower during such subsequent four quarter
period.  In calculating Projected Debt Service, (i) the interest rate applicable
during such subsequent four quarter period to any Indebtedness which does not
bear interest at a rate which is fixed (either by its terms or pursuant to an
agreement regarding Rate Hedging Obligations) for the entire subsequent period
shall be deemed to be the interest rate in effect as of the date of
determination, and (ii) it shall be assumed that the principal amount of
Reducing Loans and Working Capital Loans outstanding as of the date of
determination will be outstanding for the subsequent four quarter period subject
to any required commitment reductions.

          "Purchase Agreement" means the Purchase and Sale Agreement, dated as
           ------------------                                                 
of December 23, 1994, as amended, by and among the Sellers and the Borrower.

          "Purchase Price", in respect of any Qualified Acquisition (whether of
           --------------                                                      
assets, stock or other equity interests), means the total consideration payable
in connection with such acquisition, whether payable in cash, by a note or other
property, by the assumption of indebtedness and including all forms of deferred
compensation, such as non-compete agreements, consulting agreements and the
like.

                                     -15-
<PAGE>
 
          "Qualified Acquisition" has the meaning assigned to it in Section
           ---------------------                                           
8.10(b).

          "Quarterly Date" means the last day of each March, June, September and
           --------------                                                       
December.

          "Ratable Share" means, with respect to any Bank, its pro rata share of
           -------------                                                        
the Commitments, the Letters of Credit or the Loans.  Initially, the Ratable
Shares of the Banks shall be as listed on Schedule 1.2 attached hereto.

          "Rate Hedging Obligations" means any and all obligations of the
           ------------------------                                      
Borrower, whether absolute or contingent and howsoever and whensoever created,
arising, evidenced or acquired (including all renewals, extensions and
modifications thereof and substitutions therefor), under (a) any and all
agreements, devices or arrangements designed to protect the Borrower from the
fluctuations of interest rates, including, but not limited to, interest rate
exchange or swap agreements and interest rate cap or collar protection
agreements, and (b) any and all cancellations, buy backs, reversals,
terminations or assignments of any of the foregoing.

          "Reducing Commitment" has the meaning assigned to it in Section
           -------------------                                           
2.1(a).

          "Reducing Loans" has the meaning assigned to it in Section 2.1(a).
           --------------                                                   

          "Reducing Notes" has the meaning assigned to it in Section 2.5.
           --------------                                                

          "Regulatory Change" means the adoption of or any change in federal,
           -----------------                                                 
state or local treaties, laws, rules, regulations or policies or the adoption of
or change in any interpretations, guidelines, directives or requests of or under
any federal, state or local treaties, laws, rules, regulations or policies
(whether or not having the force of law) by any court, governmental authority,
central bank or comparable agency charged with the interpretation or
administration thereof.

          "Release" shall mean any release, spill, emission, leaking, pumping,
           -------                                                            
injection, deposit, disposal, discharge, dispersal, leaching or migration into
the indoor or outdoor environment, including, without limitation, the movement
of Hazardous Materials through ambient air, soil, surface water, ground water,
wetlands, land or subsurface strata.

          "Reportable Event" means a reportable event as that term is defined in
           ----------------                                                     
Title IV of ERISA, excluding, however, such events as to which the PBGC by
regulation has waived the requirement of Section 4043(a) of ERISA that it be
notified 

                                     -16-
<PAGE>
 
within thirty days of the occurrence of such event (provided that a failure to
                                                    --------       
meet the minimum funding standard of Section 412 of the Code and of Section 302
of ERISA shall be a Reportable Event regardless of the issuance of any such
waivers in accordance with Section 412(d) of the Code).

          "Securities Purchase Agreement" means the Securities Purchase and Loan
           -----------------------------                                        
Agreement dated as of January 11, 1995, as amended as of April 27, 1995, among
the Borrower and the purchasers named therein, as the same may be further
amended from time to time with the consent of the Banks.

          "Security Agreement" has the meaning assigned to it in Section 6.2.
           ------------------                                                

          "Seller Debt" has the meaning assigned to it in Section 8.10(b).
           -----------                                                    

          "Sellers" means Pittencrieff Communications, Inc., a Texas
           -------                                                  
corporation, and A&B Electronics, Inc., a New Mexico corporation, and "Seller"
                                                                       ------ 
means either of such Sellers.

          "Sellers Subordination Agreement" has the meaning assigned to it in
           -------------------------------                                   
Section 6.6.

          "Seller Escrow Deposit" means, as of any date, the amount held by
           ---------------------                                           
River Oaks Trust Company (the "Escrow Agent") on such date pursuant to the
Escrow Agreement dated as of March 6, 1995, among the Sellers, the Borrower and
the Escrow Agent.

          "Stockholders" means the stockholders of Holdco, and "Stockholder"
           ------------                                         ----------- 
means any of such Stockholders.

          "Stockholders Agreement" means the Stockholders Agreement, dated as of
           ----------------------                                               
April 27, 1995, by and among Holdco and the Stockholders which are a party
thereto, as the same may be amended from time to time to the extent permitted
pursuant hereto.

          "Stockholder Debt" means the Indebtedness of the Borrower to
           ----------------                                           
Centennial Fund IV, L.P. pursuant to the Securities Purchase Agreement.

          "Stockholder Pledge Agreement" has the meaning assigned to it in
           ----------------------------                                   
Section 6.3.

          "Stockholder Subordination Agreement" has the meaning assigned to it
           -----------------------------------                                
in Section 6.6.

          "Subordinated Debt" means Indebtedness of the Borrower to a
           -----------------                                         
Stockholder or to the Sellers, including the Stockholder Debt and the PCI Debt,
which is subordinate to the Obligations of 

                                     -17-
<PAGE>
 
the Borrower to the Banks pursuant to terms and conditions satisfactory to the
Agent.

          "Subsidiary" means each existing or future partnership, corporation or
           ----------                                                           
limited liability company, the majority of the outstanding partnership
interests, capital stock or voting power of which is (or upon the exercise of
all outstanding warrants, options and other rights would be) owned, directly or
indirectly, at the time in question by the Borrower.

          "Termination Date" means June 30, 2002.
           ----------------                      

          "Term Loan Prepayment Premium" means, with respect to the voluntary
           ----------------------------                                      
prepayment of the Term Loans prior to the second anniversary of the Closing
Date, an amount equal to the product of (a) an interest factor equal to the
excess of the rate of interest applicable to the Term Loans pursuant to Section
3.1 hereof on the date of such prepayment over the LIBOR Rate on the date of
such prepayment, multiplied by (b) the principal amount so prepaid, multiplied
by (c) a fraction, the numerator of which is the number of days in the period
from and including the date of such prepayment to but not including the second
anniversary of the Closing Date and the denominator of which is 360.

          "Term Loans" has the meaning assigned to it in Section 2.3(a).
           ----------                                                   

          "Term Notes" has the meaning assigned to it in Section 2.5.
           ----------                                                

          "Total Debt" means, without duplication, all Indebtedness of the
           ----------                                                     
Borrower for borrowed money, including the Loans, all Capitalized Lease
Obligations of the Borrower, all other Indebtedness of the Borrower represented
by notes or drafts representing extensions of credit for borrowed money, all
other Indebtedness of other Persons for which the Borrower is a Guarantor, all
obligations of the Borrower evidenced by bonds, debentures, notes or other
similar instruments (including all such obligations to which any property or
asset owned by the Borrower is subject, whether or not the obligation secured
thereby shall have been assumed) and all obligations of the Borrower as an
account party to reimburse any bank or any other Person in respect of letters of
credit (other than the Letters of Credit) or bankers' acceptances; provided,
                                                                   -------- 
however, that the Stockholder Debt shall not constitute Total Debt so long as it
- -------                                                                         
is subject to the Stockholder Subordination Agreement.

          "Towers" means the wireless communications towers owned or leased by
           ------                                                             
the Borrower or which are subject to a management agreement to which the
Borrower is a party and which the Borrower has obtained pursuant to a Qualified
Acquisition, and "Tower" means each of such Towers.
                  -----                            

                                     -18-
<PAGE>
 
          "Working Capital" means, as of any date, the excess of the Borrower's
           ---------------                                                     
current assets, other than cash, over its current liabilities, other than the
current portion of long term debt, as of such date.

          "Working Capital Commitment" has the meaning assigned to it in Section
           --------------------------                                           
2.2(a).

          "Working Capital Loans" has the meaning assigned to it in Section
           ---------------------                                           
2.2(a).

          "Working Capital Notes" has the meaning assigned to it in Section 2.5.
           ---------------------                                                

          1.2  Other Terms.  Except as otherwise specifically provided in this
               -----------                                                    
Agreement, each term not otherwise expressly defined herein which is defined in
the Uniform Commercial Code, as amended (the "UCC"), as adopted in any
applicable jurisdiction, shall have the meaning assigned to it in the UCC in
effect in such jurisdiction.  Whenever the context may require, any pronoun
shall include the corresponding masculine, feminine and neuter forms.  All
references herein to Sections, Exhibits or Schedules shall be deemed to be
references to Sections of, and Exhibits and Schedules to, this Agreement unless
the context shall otherwise require.  Whenever any agreement, promissory note or
other instrument or document is defined in this Agreement, such definition shall
be deemed to mean and include, from and after the date of any amendment,
restatement or modification thereof, such agreement, promissory note or other
instrument or document as so amended, restated or modified.  All terms defined
in this Agreement in the singular shall have comparable meanings when used in
the plural and vice versa.  The words "hereof," "herein" and "hereunder" and
words of similar import when used in this Agreement shall refer to this
Agreement as a whole and not to any particular provision of this Agreement.

          1.3  Accounting Terms.  All accounting terms used in this Agreement
               ----------------                                              
which are not expressly defined herein shall have the respective meanings given
to them in accordance with GAAP, all computations shall be made in accordance
with GAAP, and all balance sheets and other financial statements shall be
prepared in accordance with GAAP.


 SECTION 2.    THE LOANS.
               --------- 

          2.1  The Reducing Commitment and the Reducing Loans.
               ---------------------------------------------- 

          (a)  Subject to the terms and conditions hereof, during the period up
to but not including the Termination Date, the Banks shall make loans to the
Borrower in such amounts as the Borrower may from time to time request (the
"Reducing Loans") but 

                                     -19-
<PAGE>
 
not exceeding in aggregate principal amount at any one time outstanding
$21,700,000 (as such amount may be reduced from time to time, the "Reducing
Commitment"). Each Reducing Loan requested by the Borrower shall be funded by
the Banks in accordance with their Ratable Shares of the requested Reducing
Loan. A Bank shall not be obligated hereunder to make any additional Reducing
Loan if immediately after making such Loan, the aggregate principal balance of
all Reducing Loans made by such Bank would exceed such Bank's Ratable Share of
the Reducing Commitment. The Reducing Loans may be comprised of Base Rate Loans
or LIBOR Loans, as provided in Section 2.4 hereof.

          (b)  On June 30, 1997, the Reducing Commitment shall automatically
reduce to the then outstanding amount of the Reducing Loans, and, on each date
set forth in the table below, the Reducing Commitment shall automatically
further reduce by an amount equal to that percentage set forth in such table for
such date of the Reducing Commitment in effect on July 1, 1997:

<TABLE>
<CAPTION>
=======================================================================
 Calendar      March 31     June 30      September 30     December 31
 Year
- -----------------------------------------------------------------------
<S>            <C>          <C>          <C>              <C>
 1997          N/A          N/A          4.00%            4.00%
- -----------------------------------------------------------------------
 1998          4.00%        4.00%        4.00%            4.00%
- -----------------------------------------------------------------------
 1999          4.50%        4.50%        4.50%            4.50%
- -----------------------------------------------------------------------
 2000          4.75%        4.75%        4.75%            4.75%
- -----------------------------------------------------------------------
 2001          5.25%        5.25%        5.25%            5.25%
- -----------------------------------------------------------------------
 2002          5.75%        12.25%       N/A              N/A
=======================================================================
</TABLE>

          (c)  Prior to the Termination Date, the Borrower may, at its option,
from time to time prepay all or any portion of the Reducing Loans, subject to
the provisions of Section 2.7, and the Borrower may reborrow from time to time
hereunder amounts so paid up to the amount of the Reducing Commitment in effect
at the time of reborrowing.

          (d)  (i)  Subject to the terms and conditions hereof, the Borrower may
request the Banks to issue, and the Banks agree to issue, from time to time,
standby letters of credit (the "Letters of Credit" and each individually a
"Letter of Credit") in an aggregate stated amount for all Letters of Credit at
any one time not exceeding $5,000,000; provided, however, that each Letter of
                                       --------  -------                     
Credit shall be in an amount of not less than $250,000; and provided, further,
                                                            --------  ------- 
that no Letter of Credit shall be issued if after giving effect to such
issuance, the sum of the outstanding principal balance of the Reducing Loans
(including amounts drawn on Letters of Credit and not 

                                     -20-
<PAGE>
 
repaid), plus the aggregate face amount of outstanding Letters of Credit would
exceed the Reducing Commitment. The Letters of Credit shall only be issued to
secure not more than five notes evidencing Seller Debt. No Letter of Credit
shall be issued if the sum of the face amount of such Letter of Credit and the
face amount of all other outstanding Letters of Credit would exceed as of any
date during the term of such Letters of Credit the Reducing Commitment as in
effect as of such date. Each Letter of Credit shall be issued in the manner and
on the conditions set forth in this Section 2.1(d) and Section 6. No Letter of
Credit shall be issued after June 30, 1997, or expire later than December 31,
2001. The Banks shall not be obligated to extend or renew any Letter of Credit.
Any amount drawn upon a Letter of Credit shall be deemed to be a Reducing Loan
for all purposes of this Agreement. All Letters of Credit shall be issued by the
Banks in accordance with their Ratable Shares of the amount requested by the
Borrower.

               (ii)  Each request for a Letter of Credit shall be made to the
Agent and each Bank by an application on each Bank's standard form or in such
other manner as a Bank may approve and shall be made such reasonable time in
advance as the Agent may require. Each Letter of Credit shall be issued by the
Banks within three Banking Days after satisfaction of the conditions set forth
herein and shall be accompanied by a duly executed note (each, a "Letter of
Credit Note"), in each case on the issuing Bank's standard form or in such other
form as it may approve.

               (iii)  The Borrower shall: (A) indemnify and hold each Bank
harmless from any loss resulting from any claim, demand or liability which may
be asserted against such Bank in connection with actions taken under any Letter
of Credit, and (B) reimburse such Bank for any fees or other reasonable expenses
paid or incurred by such Bank in connection with any Letter of Credit, other
than any loss or expense resulting from such Bank's willful misconduct or gross
negligence. Any amounts paid by any Bank on any Letter of Credit shall be deemed
to be a Reducing Loan and shall bear interest from the date of payment by such
Bank as the rates provided in Section 3.1 until paid in full.

               (iv)  Upon the occurrence of any Event of Default, the Borrower
shall, upon demand, pay to each Bank the face amount of any outstanding Letter
of Credit Note issued to such Bank, which amount such Bank shall hold as
security for the obligations incurred under such Letter of Credit, this
Agreement or the Notes. The payment by the Borrower of such security shall not
terminate the obligations of the Borrower under this Section 2.1(d).

               (v)  If any Regulatory Change shall either (A) impose upon,
modify, require, make or deem applicable to any

                                     -21-
<PAGE>
 
Bank any reserve requirement, special deposit requirement, insurance assessment
or similar requirement against or affecting any Letter of Credit issued or to be
issued hereunder, or (B) subject any Bank to any tax, charge, fee, deduction or
withholding of any kind whatsoever, or (C) impose any condition upon or cause in
any manner the addition of any supplement to or increase of any kind to any
Bank's capital or cost base for issuing such Letter of Credit which results in
an increase in the capital requirement supporting such Letter of Credit, or (D)
impose upon, modify, require, make or deem applicable to any Bank any capital
requirement, increased capital requirement or similar requirement such as the
deeming of such Letters of Credit to be assets held by such Bank for capital
calculation or other purposes and the result of any events referred to in (A),
(B), (C) or (D) above shall be to increase the costs or decrease the benefit in
any way to a Bank of issuing, maintaining or participating in such Letters of
Credit, then and in such event the Borrower shall, on the third Banking Day
after the mailing of written notice of such increased costs and/or decreased
benefits to the Borrower by any Bank, pay to such Bank all such additional
amounts which in such Bank's sole good faith calculation as allocated to such
Letters of Credit, shall be sufficient to compensate it for all such increased
costs and/or decreased benefits. Such Bank's calculation shall be conclusive
absent manifest error.

               (vi)  The Letters of Credit shall be issued for an annual fee of
4.5% of the amount then drawable thereunder payable upon issuance and on each
anniversary of the issuance.

          (e)  At any time prior to the Termination Date, by written notice to
the Agent no later than 11:00 A.M. Cleveland, Ohio time five Banking Days prior
to such termination or reduction, the Borrower may permanently terminate, or
from time to time permanently reduce, the Reducing Commitment.  Such notice
shall be in writing or by telephonic communication confirmed by telecopy or
other facsimile transmission on the same day as such telephone notice.  Any such
partial reduction hereunder shall be in an amount which is not less than
$2,500,000 or an integral multiple of $1,000,000 in excess thereof.  The Agent
shall notify the Banks of any such reduction or termination of the Reducing
Commitment.

          (f)  All Reducing Loans, together with all interest accrued thereon,
shall be paid in full no later than the Termination Date.

          (g)  All reductions of the Reducing Commitment pursuant to Section
2.1(e), 2.7(c) or any other provision of this Agreement shall be permanent
reductions, and the Reducing Commitment shall not be increased.

                                     -22-
<PAGE>
 
          2.2  The Working Capital Commitment and the Working Capital Loans.
               ------------------------------------------------------------ 

               (a)  Subject to the terms and conditions hereof, during the
period up to but not including the Termination Date, the Banks shall make loans
to the Borrower in such amounts as the Borrower may from time to time request
(the "Working Capital Loans") but not exceeding in aggregate principal amount at
any one time outstanding $1,000,000 (as such amount may be reduced from time to
time, the "Working Capital Commitment"). Each Working Capital Loan requested by
the Borrower shall be funded by the Banks in accordance with their Ratable
Shares of the requested Working Capital Loan. A Bank shall not be obligated
hereunder to make any additional Working Capital Loan if immediately after
making such Loan, the aggregate principal balance of all Working Capital Loans
made by such Bank would exceed such Bank's Ratable Share of the Working Capital
Commitment. All Working Capital Loans may be comprised of Base Rate Loans or
LIBOR Loans, as provided in Section 2.4 hereof.

               (b)  Prior to the Termination Date, the Borrower may, at the
Borrower's option, from time to time prepay all or any portion of the Working
Capital Loans, subject to the provisions of Section 2.7, and the Borrower may
reborrow from time to time hereunder amounts so paid up to the amount of the
Working Capital Commitment in effect at the time of reborrowing.

               (c)  At any time prior to the Termination Date, by written notice
to the Agent no later than 11:00 A.M. Cleveland, Ohio time five Banking Days
prior to such termination or reduction, the Borrower may permanently terminate,
or from time to time permanently reduce, the Working Capital Commitment. Such
notice shall be in writing or by telephonic communication confirmed by telecopy
or other facsimile transmission on the same day as such telephone notice. Any
such partial reduction hereunder shall be in an amount which is not less than
$250,000 or an integral multiple of $250,000 in excess thereof. The Agent shall
notify the Banks of any such reduction or termination of the Working Capital
Commitment.

               (d)  All Working Capital Loans, together with all interest
accrued thereon, shall be paid in full no later than the Termination Date.

               (e)  All reductions of the Working Capital Commitment pursuant to
Sections 2.2(c) or 2.7(c) or any other provision hereof shall be permanent
reductions, and the Working Capital Commitment shall not be increased.

                                     -23-
<PAGE>
 
          2.3  The Term Loan.
               ------------- 

               (a)  Subject to the terms and conditions of this Agreement, on
the Closing Date the Banks, severally, but not jointly, shall lend to the
Borrower on a term loan basis an aggregate amount equal to $2,300,000 (the "Term
Loans"). The Term Loans shall be funded by the Banks in accordance with their
Ratable Shares. No portion of the Term Loans, upon the payment or prepayment
thereof, may be reborrowed.

               (b)  The aggregate principal of the Term Loans shall be repaid in
fourteen installments due in the amounts and on the dates set forth in the
following table, with the final installment of all then outstanding principal,
together with all accrued interest, due no later than the Termination Date:

<TABLE>
<CAPTION>
=========================================================================
 Calendar      March 31      June 30        September       December 
 Year                                       30              31
- -------------------------------------------------------------------------
<S>            <C>           <C>            <C>             <C>
 1999          $ 62,500      $ 62,500       $ 62,500        $ 62,500
- -------------------------------------------------------------------------
 2000          $187,500      $187,500       $187,500        $187,500
- -------------------------------------------------------------------------
 2001          $250,000      $250,000       $250,000        $250,000
- -------------------------------------------------------------------------
 2002          $150,000      all            N/A             N/A
                             remaining
                             principal
=========================================================================
</TABLE>

          2.4  Making and Conversion/Continuation of the Loans.
               ----------------------------------------------- 

               (a)  Making of the Loans.
                    ------------------- 

                    (i)  Each Reducing Loan and each Working Capital Loan shall
be made by the Banks in such amount as the Borrower shall request, provided that
                                                                   --------
each borrowing shall be in an amount which is a minimum of (A), with respect to
any LIBOR Loan, $500,000, and integral multiples of $250,000 in excess thereof,
and (B) with respect to any Base Rate Loan, $250,000 and integral multiples of
$100,000 in excess thereof or such lesser amount as may be equal to the then
unused portion of the Reducing Commitment or the Working Capital Commitment, as
the case may be. The obligation of the Banks to make any Loan is conditioned
upon (x) the fact that no Possible Default or Event of Default shall then exist
or immediately after the Loan would exist; (y) the fact that all of the
Collateral Documents shall still be in full force and effect; and (z) the fact
that the representations and warranties contained herein and in the Collateral
Documents shall be true and correct in all material respects as if made on and
as of the date of such borrowing, except to the extent that any thereof
expressly relate to an earlier date.

                                     -24-
<PAGE>
 
                    (ii)  Subject to the satisfaction of the conditions set
forth in Section 6, Loans shall be effected at the principal banking office of
the Agent in Cleveland, Ohio, and shall be made at such times as the Borrower
may request by notice to the Agent no later than 11:00 A.M. Cleveland, Ohio time
(A) three Banking Days prior to the date of a requested LIBOR Loan and (B) one
Banking Day prior to the date of a requested Base Rate Loan. Such notices shall
be in writing, or by telephonic communication confirmed by telecopy or other
facsimile transmission on the same day as the telephone request, and shall
specify the proposed date and the amount of the requested Loan, whether it is to
bear interest initially at an interest rate based on the Base Rate or the LIBOR
Rate, and the Interest Period thereof, if applicable.

                    (iii)  Upon receipt of each borrowing notice for a Reducing
Loan or a Working Capital Loan, the Agent shall promptly notify each Bank of the
type, amount and date of the proposed borrowing or conversion. Not later than
11:00 A.M. Cleveland time, on the date of a proposed borrowing of a Reducing
Loan or Working Capital Loan, as the case may be, each Bank shall provide the
Agent at its address specified in Section 12.4 hereof with immediately available
funds covering such Bank's Ratable Share of the borrowing, and the Agent shall
pay over such immediately available funds to the Borrower.

               (b)  Conversion/Continuation of the Loans.  At the Borrower's 
                    ------------------------------------   
election pursuant to notice given to the Agent not later than 11:00 A.M.
Cleveland, Ohio time three Banking Days prior to such conversion or
continuation, any Base Rate Loan or LIBOR Loan may be converted to or continued
as, as the case may be, a LIBOR Loan as requested by the Borrower; provided,
                                                                   --------
however, that each conversion shall be in an amount which is a minimum of 
- -------                      
$500,000, and integral multiples of $250,000 in excess thereof; and provided,
                                                                    --------  
further, that no Loan may be continued as or converted to a LIBOR Loan at any 
- -------                               
time that an Event of Default or Possible Default exists; and provided, still,
                                                              --------  -----
further, that no Term Loan may be converted to a Base Rate Loan or LIBOR Loan.  
- -------                                    
If the Borrower has not timely delivered to the Agent such notice with respect
to any terminating Interest Period, the affected LIBOR Loan shall convert to a
Base Rate Loan at the end of such Interest Period.

               (c)  Number of Interest Rate Options.  In no event shall the 
                    -------------------------------   
Borrower have more than three LIBOR Loans outstanding at any time.

               (d)  Incurrence Limitations.
                    ---------------------- 

                    (i)  The Borrower may not borrow any Working Capital Loan if
the proceeds of such Loan are to be used to prepay any part of the Term Loans.
The Borrower may not borrow

                                     -25-
<PAGE>
 
any Reducing Loan if the proceeds of such Loan are to be used to prepay any part
of the Term Loans unless (A) such Loan is made prior to the second anniversary
of the Closing Date and (B) the Leverage Ratio has not at any time prior to the
making of such Loan been in excess of 5.0 to 1.0. If the Borrower uses the
proceeds of any Reducing Loan to prepay any part of the Term Loans, then (A) the
Average Acquisition Leverage Multiple set forth in Step 3 of the Acquisition
Advance Worksheet shall be reduced to 5.0 to 1.0 at all times thereafter and (B)
the Acquisition Leverage Multiple set forth in Step 3 of the Acquisition Advance
Worksheet shall be reduced to 67%.

                    (ii)  No more than [$_____________] may be borrowed on the
Closing Date for application to the portion of the purchase price then payable
under the Purchase Agreement.

                    (iii)  No later than ten Banking Days prior to the closing
of any Qualified Acquisition, the Borrower shall deliver to the Agent a properly
completed Acquisition Advance Worksheet computing, in accordance with such
worksheet, the amount of the Reducing Loans available to be borrowed in
connection with such acquisition. The Borrower shall provide to the Agent any
information and documentation reasonably requested by the Agent to assist in its
review of such worksheet and its verification of the computations set forth
therein. Subject to the Agent's satisfaction with the computations set forth
therein, the Borrower may borrow an amount of Reducing Loans up to but not
exceeding the lesser of the maximum availability as established in such
worksheet and the undrawn amount of the Reducing Commitment. No proceeds of a
Reducing Loan made after June 30, 1997, shall be used to pay any portion of the
Purchase Price of a Qualified Acquisition.

          2.5  The Notes.  All Reducing Loans shall be evidenced by separate
               ---------                                                    
promissory notes payable to the Banks substantially in the form attached hereto
as Exhibit A to be duly executed and delivered by the Borrower at or prior to
   ---------                                                                 
the Closing in the principal amount of the Reducing Commitment (the "Reducing
Notes").  All Working Capital Loans shall be evidenced by separate promissory
notes payable to the Banks substantially in the form attached hereto as Exhibit
                                                                        -------
B to be duly executed and delivered by the Borrower at or prior to the Closing
- -                                                                             
in the principal amount of the Working Capital Commitment (the "Working Capital
Notes").  All Term Loans shall be evidenced by separate promissory notes payable
to the Banks substantially in the form attached hereto as Exhibit C to be duly
                                                          ---------           
executed and delivered by the Borrower at or prior to the Closing in the
aggregate principal amount of the Term Loans (the "Term Notes").  The Banks may,
and are hereby authorized by the Borrower to, set forth on the grids attached to
the Notes, or in other comparable records maintained by them, the amount of each
Loan, all payments and prepayments of principal and interest received, the
current 

                                     -26-
<PAGE>
 
outstanding principal balance, and other appropriate information. The aggregate
unpaid amount of any Loan set forth in any records maintained by a Bank with
respect to a Note shall be presumptive evidence of the principal amount owing
and unpaid on such Note. Failure of a Bank to record the principal amount of any
Loan on the grid(s) attached to a Note shall not limit or otherwise affect the
obligation of the Borrower hereunder or under such Note to repay the principal
amount of such Loan and all interest accruing thereon.

          2.6  Fees.  The Borrower shall pay to the Agent, for the benefit of
               ----                                                          
the Banks, a commitment fee of  1/2% per annum (based on a year having 360 days
and actual days elapsed) on the aggregate average daily undisbursed amount of
each Commitment. Such commitment fee shall (a) commence to accrue as of the
earlier of the Closing Date and April 18, 1995, and continue for each day to and
including the Termination Date, (b) be in addition to any other fee required by
the terms and conditions of this Agreement or any other agreement among or
between the parties hereto, (c) be payable quarterly in arrears on each
Quarterly Date and (d) be shared by the Banks in accordance with their Ratable
Shares.

          2.7  Prepayment.
               ---------- 

               (a)  Voluntary Prepayments.
                    --------------------- 

                    (i)  By notice to the Agent (which shall be in writing or by
telephonic communication confirmed by telecopy or other facsimile transmission
on the same day as such telephone notice) no later than 11:00 A.M. Cleveland,
Ohio time on the Banking Day prior to such prepayment (with respect to any Base
Rate Loan) or on the third Banking Day prior to such prepayment (with respect to
any LIBOR Loan), the Borrower may, at its option, prepay the Reducing Loans or
the Working Capital Loans in whole at any time or in part from time to time
without penalty or premium (except as provided in Section 2.7(d)); provided,
                                                                   -------- 
however, that each partial prepayment of the Reducing Loans shall be in the
- -------                                                                    
aggregate principal amount of not less than $250,000 or an integral multiple of
$250,000 in excess thereof and that each partial prepayment of the Working
Capital Loans shall be in the aggregate principal amount of not less than
$100,000 or an integral multiple of $100,000 in excess thereof.

                    (ii)  By notice to the Agent (which shall be in writing or
by telephonic communication confirmed by telecopy or other facsimile
transmission on the same day as such telephone notice) no later than 11:00 A.M.
Cleveland, Ohio time on the third Banking Day prior to such prepayment, the
Borrower may, at its option, prepay the Term Loans in whole or in part;
provided, however, that each partial prepayment shall be in the aggregate  
- --------  ------- 
principal amount of not less than $250,000 or an integral 

                                     -27-
<PAGE>
 
multiple of $100,000 in excess thereof; provided, further, that the Borrower
                                        --------  -------   
shall pay to the Agent, for the benefit of the Banks, the applicable Term Loan
Prepayment Premium upon any voluntary prepayment of the Term Loans prior to the
second anniversary of the Closing Date; provided, still, further, that, unless
                                        --------  -----  -------   
such prepayment is in connection with a prepayment of all Loans, together with
all accrued interest and all other amounts due hereunder or under the Collateral
Documents, all voluntary prepayments of any Term Loan may only be made on the
last day of April of any year and may not exceed an amount equal to 50% of the
prior year's Excess Cash Flow. All accrued interest (including Deferred
Interest) on the amount prepaid shall be paid with the prepayment. The amount of
any voluntary prepayment that may be made pursuant to the last proviso of the
first sentence of this Section 2.7(a)(ii) shall be determined from the annual
financial statements delivered by the Borrower pursuant to Section 7.5(a) in
respect of such fiscal year, and any such voluntary prepayment shall be
accompanied by a certificate executed by the chief financial officer of the
Borrower setting forth the calculations from which the amount of such prepayment
and satisfaction of the conditions set forth herein were determined.

               (b)  Mandatory Prepayments.
                    --------------------- 

                    (i)  Reduction of Commitments.  If at any time the sum of 
                         ------------------------   
the outstanding principal amount of the Reducing Loans plus the face amount of
all outstanding Letters of Credit exceeds the Reducing Commitment, or if at any
time the outstanding principal amount of the Working Capital Loans exceeds the
Working Capital Commitment, the Borrower shall immediately prepay the Reducing
Loans or the Working Capital Loans, as the case may be, without penalty or
premium (except that any such prepayment of any LIBOR Loan shall be made
together with the applicable LIBOR Prepayment Premium), in an amount necessary
to cause the outstanding principal amount of the Reducing Loans not to exceed
the Reducing Commitment or to cause the outstanding principal amount of the
Working Capital Loans not to exceed the Working Capital Commitment, as the case
may be. All accrued interest on the amount prepaid shall be paid with the
prepayment.

                    (ii)  Excess Cash Flow Recapture.  Within ninety days of the
                          --------------------------          
end of each fiscal year ending on or after December 31, 1996, the Borrower shall
make a mandatory prepayment of the Loans in an amount equal to 50% of the Excess
Cash Flow for such fiscal year. Mandatory prepayments made pursuant to this
Section 2.7(b)(ii) shall be determined from the annual financial statements
delivered by the Borrower pursuant to Section 7.5(a) in respect of such fiscal
year and shall be accompanied by a certificate executed by the chief financial
officer of the Borrower setting forth the calculations from which the amount of
such prepayment was determined.

                                     -28-
<PAGE>
 
                    (iii)  Asset Sales.  Immediately upon receipt by the 
                           -----------               
Borrower of cash proceeds of any Asset Sale, the Borrower shall immediately make
a mandatory prepayment of the Loans in an amount equal to such cash proceeds,
net of any costs directly incurred in connection with such Asset Sale and any
taxes reasonably estimated to be payable in connection with such Asset Sale as
certified by the Borrower's chief financial officer. Together with such
prepayment, the Borrower shall deliver to the Agent a certificate executed by
the chief financial officer of the Borrower setting forth the calculation of the
net cash proceeds of such Asset Sale.

                    (iv)  Unapplied Insurance Proceeds.  Within ninety days from
                          ----------------------------   
the date of receipt of any cash payments under any insurance policy maintained
by the Borrower which have not been reinvested in productive assets of a kind
then used or usable in the business of the Borrower or used to maintain the
business of the Borrower as a going concern, the Borrower shall make a mandatory
prepayment of the Loans in the amount of such unreinvested or unused proceeds,
net of any costs directly incurred in connection with receiving payment of such
proceeds and any taxes reasonably estimated to be payable in connection with
such receipt as certified by the Borrower's chief financial officer; provided,
                                                                     --------
however, that upon and during the continuance of any Event of Default or 
- -------      
Possible Default all such insurance proceeds received by the Borrower shall be
applied as a prepayment of the Loans.

               (c)  Application of Prepayments.
                    -------------------------- 

                    (i)  Application to Accrued Interest.  All prepayments made
                         -------------------------------   
pursuant to this Section 2.7 shall be applied as follows: first, to accrued
interest (including, in the case of a prepayment of the Term Loans, Deferred
Interest) and then to the outstanding principal of the Loans. For purposes of
the calculation of interest and the determination of whether any LIBOR
Prepayment Premium is due in connection with any such prepayment, such principal
prepayments shall be applied first to the Base Rate Loans and then to the LIBOR
Loans with the shortest remaining Interest Periods.

                    (ii)  Application to Reducing Loans, Working Capital Loans 
                          ----------------------------------------------------
and Term Loans.  All mandatory prepayments of principal required to be made 
- --------------   
pursuant to Section 2.7(b)(ii), (iii) or (iv) shall be applied first to the
Reducing Loans and then, after the Reducing Loans and the Reducing Commitment
have been reduced to zero, to the Working Capital Loans and then, after the
Working Capital Loans and the Working Capital Commitment have been reduced to
zero, to the Term Loans. All voluntary and mandatory prepayments of the Term
Loans shall be applied to the subsequent principal installments due under
Section 2.3(b) in the inverse order of maturity.

                                     -29-
<PAGE>
 
                    (iii)  Application to the Reducing Loans and the Reducing 
                           --------------------------------------------------
Commitment. Any mandatory prepayment of the Reducing Loans (other than pursuant
- ----------
to Section 2.7(b)(i)) shall cause the Reducing Commitment to be immediately and
automatically reduced by the amount of such prepayment, and each such mandatory
reduction shall be applied to the subsequent Reducing Commitment reductions set
forth in Section 2.1(b) in the inverse order of maturity.

                    (iv)  Application to the Working Capital Loans and the 
                          ------------------------------------------------
Working Capital Commitment. Any mandatory prepayment of the Working Capital
- --------------------------
Loans (other than pursuant to Section 2.7(b)(i)) shall cause the Working Capital
Commitment to be immediately and automatically reduced by the amount of such
prepayment.

               (d)  Prepayment Premiums.  The Borrower shall pay to the Agent, 
                    -------------------   
for the benefit of the Banks, the applicable LIBOR Prepayment Premium upon any
prepayment or conversion (whether voluntary or involuntary) of any LIBOR Loan
not made on the last day of the applicable Interest Period.  The Borrower shall
pay to the Agent, for the benefit of the Banks, the applicable Term Loan
Prepayment Premium, if any, upon any prepayment (whether voluntary or
involuntary) of the Term Loans.

          2.8  Reserves or Deposit Requirements, Etc.  If at any time any
               -------------------------------------                     
Regulatory Change (including without limitation, any change in Regulation D of
the Board of Governors of the Federal Reserve System) shall impose any reserve
and/or special deposit requirement (other than reserves included in the LIBOR
Reserve Percentage, the effect of which is reflected in the interest rate of any
LIBOR Loan) against assets held by, or deposits in or for the amount of any
loans by, any Bank, and the result of the foregoing is to increase the cost
(whether by incurring a cost or adding to a cost) to such Bank of taking or
maintaining hereunder any LIBOR Loan or to reduce the amount of principal,
interest or fees received by such Bank with respect to any such Loan, then such
Bank shall notify the Borrower and the Agent of such occurrence.  Thereafter,
within ten days after written demand by such Bank the Borrower shall pay to such
Bank additional amounts sufficient to compensate and indemnify such Bank for
such increased cost or reduced amount.  A statement as to the increased cost or
reduced amount as a result of any event mentioned in this Section shall be
submitted by such Bank to the Agent and to the Borrower and shall, in the
absence of manifest error, be conclusive and binding as to the amount thereof.

          2.9  Tax Law, Increased Costs, Etc.  In the event that by reason of
               -----------------------------                                 
any Regulatory Change, any Bank shall, with respect to this Agreement or any
transaction under this Agreement, be subjected to any tax, levy, impost, charge,
fee, duty, deduction or withholding of any kind whatsoever (other than any tax
imposed 

                                     -30-
<PAGE>
 
upon the net income of such Bank and other than changes in franchise taxes), and
if any such measure or any other similar measure shall result in an increase in
the costs to such Bank of making or maintaining any LIBOR Loan or in a reduction
in the amount of principal or interest ultimately receivable by such Bank in
respect of such Loan, then such Bank shall notify the Borrower and the Agent
stating the reasons therefor. The Borrower shall thereafter pay to such Bank
within ten days after written demand such additional amounts as will compensate
such Bank for such increased cost or reduced amount. A statement as to any such
increased cost or reduced amount shall be submitted by such Bank to the Agent
and to the Borrower and shall, in the absence of manifest error, be conclusive
and binding as to the amount thereof.

          2.10  Eurodollar Deposits Unavailable or Interest Rate 
                ------------------------------------------------
Unascertainable. If any Bank determines that dollar deposits of the relevant
- ---------------
amount for the relevant Interest Period are not available to it in the
applicable Eurodollar market or if the Agent determines that, by reason of
circumstances affecting such market, adequate and reasonable means do not exist
for ascertaining the LIBOR Rate applicable to such Interest Period, or if any
Bank determines that the LIBOR Rate does not adequately reflect the cost to such
Bank of making such Loan, as the case may be, the Agent or such Bank shall
promptly give notice of such determination to the Agent and to the Borrower, and
any request for a new LIBOR Loan or notice of conversion of an existing Loan to
a LIBOR Loan given thereafter or previously given by the Borrower and not yet
converted shall be deemed a notice to make a Base Rate Loan.

          2.11  Changes in Law Rendering LIBOR Loans Unlawful. If at any time 
                ---------------------------------------------  
any Regulatory Change shall make it unlawful for any Bank to fund any LIBOR Loan
which it has committed to make hereunder with moneys obtained in the applicable
Eurodollar market, such Bank shall notify the Agent and the Borrower, and the
obligation of the Banks to fund such Loan shall, upon the happening of such
event, forthwith be suspended for the duration of such illegality.  If any such
change makes it unlawful for any Bank to continue in effect the funding in the
applicable Eurodollar market of any LIBOR Loan previously made by it hereunder,
such Bank shall, upon the happening of such event, notify the Agent and the
Borrower thereof in writing stating the reasons therefor, and the Borrower
shall, on the earlier of (a) the last day of the then current Interest Period or
(b) if required by such Regulatory Change on such date as shall be specified in
such notice, either convert all such Loans to Base Rate Loans or prepay all such
Loans in full.

          2.12  Funding.  Any Bank may, but shall not be required to, make LIBOR
                -------                                                         
Loans hereunder with funds obtained outside the United States.

                                     -31-
<PAGE>
 
          2.13  Indemnity.  Without prejudice to any other provisions of 
                ---------   
Sections 2.8 through 2.12, the Borrower hereby agrees to indemnify each Bank
against any loss or expense which it may sustain or incur as a consequence of
the Borrower's failure to borrow any LIBOR Loan requested pursuant to this
Agreement or any default by the Borrower in payment when due of any amount due
hereunder in respect of any LIBOR Loan or any prepayment or conversion by the
Borrower of a LIBOR Loan prior to the end of its Interest Period, whether
voluntarily or as required pursuant to the terms hereof, including, but not
limited to, any premium or penalty incurred by such Bank in respect of funds
borrowed by it for the purpose of making or maintaining such Loan, as determined
by such Bank; provided, however, that such indemnification shall be net of any
              --------  -------                                       
LIBOR Prepayment Premium received by such Bank in respect of any such action or
inaction of the Borrower. A statement as to any such loss or expense shall be
submitted by such Bank to the Agent and the Borrower for payment under the
aforesaid indemnification, which statement shall, in the absence of manifest
error, be conclusive and binding as to the amount thereof.

          2.14  Capital Adequacy.  If any Bank shall determine that any
                ----------------                                       
Regulatory Change regarding capital adequacy or compliance by such Bank (or its
lending office) with any request or directive regarding capital adequacy
(whether or not having the force of law) of any governmental authority, central
bank or comparable agency has or would have the effect of reducing the rate of
return on such Bank's capital (or on the capital of such Bank's holding company)
as a consequence of its obligations hereunder to a level below that which such
Bank (or its holding company) could have achieved but for such Regulatory Change
or compliance (taking into consideration such Bank's policies or the policies of
its holding company with respect to capital adequacy) by an amount which such
Bank deems to be material, then from time to time, within ten days after demand
by such Bank, the Borrower shall pay to such Bank such additional amount or
amounts as will compensate such Bank (or its holding company) for such
reduction. A certificate of such Bank claiming compensation under this Section
and setting forth the additional amount or amounts to be paid to it hereunder
shall be conclusive in the absence of manifest error.  In determining such
amount, such Bank may use any reasonable averaging and attribution methods.  The
protection of this Section shall be available to each Bank regardless of any
possible contention of the invalidity or inapplicability of the law, regulation
or other condition which shall have been imposed.

          2.15  Taxes.  All sums payable by the Borrower hereunder or under the
                -----                                                          
Notes, whether of principal, interest, fees, expenses or otherwise, shall be
paid in full, free of any deductions or withholdings for any and all present and
future taxes, levies, imposts, stamps, duties, fees, assessments, deductions,
withholdings, and other governmental charges and all 

                                     -32-
<PAGE>
 
liabilities with respect thereto (collectively referred to as "Taxes"). If the
                                                               -----         
Borrower is prohibited by law from making payments hereunder or under the Notes
free of such deductions or withholdings, then the Borrower shall pay such
additional amount as may be necessary in order that the actual amount received
by the Banks after such deduction or withholding shall equal the full amount
stated to be payable hereunder or under the Notes. The Borrower shall pay
directly to all appropriate taxing authorities any and all present and future
Taxes, and all liabilities with respect thereto imposed by law or by any taxing
authority on or with regard to any aspect of the transactions contemplated by
this Agreement or the execution and delivery of this Agreement or the Notes,
except for any Taxes or other liabilities that the Borrower is contesting in
good faith by appropriate proceedings, provided that the Borrower hereby
                                       --------                 
indemnifies the Agent and each of the Banks and holds them harmless from and
against any and all liabilities, fees or additional expense with respect to or
resulting from any delay in paying, or omission to pay, Taxes. Within thirty
days after the payment by the Borrower of any Taxes, the Borrower shall furnish
the Agent with the original or a certified copy of the receipt evidencing
payment thereof, together with any other information the Agent may reasonably
require to establish to its satisfaction that full and timely payment of such
Taxes has been made. The Agent shall notify the Borrower of any payment of Taxes
required or requested of it and shall give due consideration to any advice or
recommendation given in response thereto by the Borrower, and upon notice from
the Agent or any Bank that Taxes or any liability relating thereto (including
penalties and interest) have been paid, the Borrower shall pay or reimburse the
paying Bank therefor within ten days of such notice. Without prejudice to the
survival of any other agreement of the Borrower hereunder, the agreements and
obligations of the Borrower contained in this Section shall survive the payment
in full of principal and interest hereunder and under the Notes.


SECTION 3.     INTEREST; PAYMENTS.
               ------------------ 

          3.1  Interest.
               -------- 

               (a)  Subject to Section 3.1(c) below, prior to maturity, (i)
Reducing Loans and Working Capital Loans which are LIBOR Loans shall bear
interest at the LIBOR Rate plus the Applicable Margin, (ii) Reducing Loans and
Working Capital Loans which are Base Rate Loans shall bear interest at the Base
Rate plus the Applicable Margin and (iii) Term Loans shall bear interest at 16%
per annum.

               (b)  The Applicable Margin shall be determined by the Agent
annually based on the financial statements delivered to the Banks pursuant to
Section 7.5(a) below. Any change in the 

                                     -33-
<PAGE>
 
interest rate on the Loans due to a change in the Applicable Margin shall be
effective on the fifth Banking Day after delivery of such financial statements;
provided, however, that if any such annual financial statements indicate an 
- --------  -------                         
increase in the Applicable Margin and such financial statements are not provided
within the time period required in Section 7.5(a), the increase in the interest
rate due to such increase in the Applicable Margin shall be effective
retroactively as of the fifth Banking Day after the date on which such financial
statements were due; and provided, further, that at all times that any of the  
                         --------  -------         
Stockholder Debt is secured, the Applicable Margin shall be calculated as if the
ratio of Total Debt to Operating Cash Flow were greater than 5.0 to 1.0. The
Borrower shall deliver to the Banks with each set of annual financial statements
which indicate a change in the Applicable Margin a notice with respect to such
change.

          (c)  Upon the occurrence of any Event of Default, (i) the entire
outstanding principal amount of each Reducing Loan and each Working Capital Loan
and (to the extent permitted by law) unpaid interest thereon shall bear interest
until paid in full at the Default Interest Rate which shall be payable upon
demand and (ii) the entire outstanding principal amount of each Term Loan and
(to the extent permitted by law) unpaid interest thereon shall bear interest
until paid in full at a rate of interest equal to the rate otherwise applicable
to such Term Loan plus 2% per annum which shall be payable upon demand.

          (d)  Interest shall be computed on a Three Hundred Sixty day year
basis calculated for the actual number of days elapsed.  Interest accrued on
each Base Rate Loan shall be paid quarterly in arrears on each Quarterly Date
after the date hereof until such Loan is paid in full.  Interest accrued on each
LIBOR Loan shall be paid on the last day of the Interest Period thereof.
Interest accrued on the Term Loans shall be paid as follows: (i) interest at the
rate of 10% per annum shall be paid quarterly in arrears on each Quarterly Date
after the date hereof until such Loan is paid in full and (ii) the balance of
the accrued interest (6% per annum) shall accrue and compound annually and shall
be paid on the earlier of (A) the date that all outstanding principal of the
Term Loans is paid and (B) the Termination Date (the "Deferred Interest").  The
Borrower shall not have the right to prepay Deferred Interest; provided,
                                                               -------- 
however, that the Borrower shall have the right on each March Quarterly Date to
- -------                                                                        
make a prepayment of Deferred Interest in an amount not to exceed 25% of Excess
Cash Flow for the prior fiscal year.

          (e)  The rate of interest payable on any Note from time to time shall
in no event exceed the maximum rate, if any, permissible under applicable law.
If the rate of interest payable on any Note is ever reduced as a result of the
preceding 

                                     -34-
<PAGE>
 
sentence and at any time thereafter the maximum rate permitted by applicable law
shall exceed the rate of interest provided for on such Note, then the rate
provided for on such Note shall be increased to the maximum rate permitted by
applicable law for such period as is required so that the total amount of
interest received by the holder of such Note is that which would have been
received by such holder but for the operation of the preceding sentence.

          3.2  Manner of Payments.
               ------------------ 

               (a)  Prior to each Quarterly Date and the end of each Interest
Period, the Agent shall render a statement to the Borrower of all amounts due to
the Banks for principal, interest and fees hereunder. All amounts listed on each
such statement shall be due and payable on the Quarterly Date or, as the case
may be, the last day of such Interest Period, in respect of which such statement
was sent. As to all other Obligations which become due and payable other than on
a fixed date by their terms, the Agent shall advise the Borrower by a written
statement that they are due and payable, and the Borrower shall pay the same
within ten days of receipt of such statement. If any amounts are not paid by the
Borrower when due and payable, such amounts shall bear interest at the Default
Interest Rate, and the Banks may then charge any account of the Borrower for
such Obligation in the amount due to the Banks. Any failure by the Agent to
render any such statement or give any such advice shall in no way relieve the
Borrower of any liability for or obligation to pay any amount due and payable
hereunder.

               (b)  Whenever any payment to be made hereunder, including without
limitation any payment to be made on a Note, shall be stated to be due on a day
which is not a Banking Day, such payment may be made on the next succeeding
Banking Day, and such extension of time shall in each case be included in the
computation of the interest payable on such Note.

               (c)  Unless otherwise provided in this Agreement, all payments or
prepayments made or due hereunder or under the Notes shall be made in
immediately available funds by federal funds wire transfer, and without setoff,
deduction or counterclaim, to the Agent prior to 11:00 A.M., Cleveland time, on
the date when due, at its offices at 127 Public Square, Cleveland, Ohio 44114,
or at such other place as may be designated by the Agent.  Funds received after
11:00 A.M., Cleveland time, shall be deemed to have been received on the next
Banking Day.  To the extent any such payment is made for the ratable benefit of
the Banks, the Agent shall promptly distribute such payment to the Banks in
accordance with their respective Ratable Shares.

                                     -35-
<PAGE>
 
SECTION 4.    CLOSING.
              ------- 

          The closing of the transactions contemplated by this Agreement shall
take place on or about April 26, 1995, or such other date as to which the
parties may agree (the "Closing" and the "Closing Date").  Subject to the terms
and conditions hereof, upon the fulfillment or waiver in writing of all the
conditions precedent set out in Section 6, and the delivery to the Banks of the
Notes, the Banks shall make such Loans as may be requested by the Borrower.


SECTION 5.    REPRESENTATIONS AND WARRANTIES OF THE BORROWER.
              ---------------------------------------------- 

          To induce the Banks to enter into this Agreement and to make the
Loans, the Borrower represents and warrants as follows:

          5.1  Organization and Powers.  The Borrower is a corporation, duly
               -----------------------                                      
organized, validly existing and in good standing under the laws of the State of
Delaware.  The Borrower is duly qualified or registered to conduct business and
in good standing under the laws of each jurisdiction in which any Tower is
located and of each other jurisdiction in which the character of its business or
the ownership of its assets makes such qualification or registration necessary,
except where failure to so qualify or register could not reasonably be expected
to have a Material Adverse Effect.  The Borrower has all requisite power and
authority to own and operate its properties, to carry on its business as now
conducted and proposed to be conducted, to enter into the Purchase Agreement,
this Agreement and the Collateral Documents to which it is a party and all other
documents to be executed by it in connection with the transactions contemplated
hereby and thereby and to carry out the terms hereof and thereof.

          5.2  Authorization.  All necessary corporate, stockholder or other
               -------------                                                
actions on the part of the Borrower to authorize the execution and delivery of
the Purchase Agreement, this Agreement and the Collateral Documents, and the
performance of the obligations of the Borrower herein and therein, have been
taken.  This Agreement, the Purchase Agreement and each Collateral Document have
been duly authorized and executed and are valid and legally binding upon the
Borrower to the extent it is a party thereto, and enforceable in accordance with
their respective terms, except to the extent that the enforceability thereof may
be limited by bankruptcy, insolvency or like laws affecting creditors rights
generally and the availability of equitable remedies.

          5.3  Financial Statements.  Exhibit D attached hereto contains the
               --------------------   ---------                             
Borrower's unaudited financial statements as of March 31, 1995, and for the
three month period then ended, 

                                      -36-
<PAGE>
 
including a balance sheet, income statement and statement of cash flows (the
"Financial Statements"). The Financial Statements are true and complete in all
material respects, disclose all material contingent liabilities and present
fairly the financial condition and results of operations of the Borrower as of
the dates and for the periods indicated and have been prepared in accordance
with GAAP, subject in the case of statements for interim periods to normal year-
end adjustments and to the absence of footnotes.

          5.4  Projections.  Exhibit E attached hereto are the Borrower's
               -----------   ---------                                   
projections for the calendar years 1995 through 2001. Such projections were
prepared on an operating basis and assume the consummation of the transactions
contemplated in the Purchase Agreement.  Such projections represent the
Borrower's best estimate of projected future operations as of the date of this
Agreement.

          5.5  Capitalization of the Borrower.  The capitalization of Holdco and
               ------------------------------                                   
of the Borrower as of the date hereof is as set forth on Exhibit F attached
                                                         ---------         
hereto, including the identity of each Stockholder and the number of shares of
stock of each Stockholder.  Holdco owns all of the issued and outstanding
capital stock of the Borrower.  All of the issued and outstanding shares of
capital stock of the Borrower have been duly and validly issued and are fully
paid and nonassessable. All of the authorized, issued and outstanding shares of
capital stock of the Borrower are free and clear of any Liens, except as
disclosed on Exhibit F, and except for the Lien in favor of the Agent.  None of
             ---------                                                         
such capital stock has been issued in violation of the Securities Act of 1933,
as amended, or the securities or "Blue Sky" or any other applicable laws, rules
or regulations of any applicable jurisdiction.  Except as set forth on Exhibit
                                                                       -------
F, as of the date hereof, the Borrower has no commitment or obligation, either
- -
firm or conditional, to issue, deliver, purchase or sell, under any offer,
option agreement, bonus agreement, purchase plan, incentive plan, compensation
plan, warrant, conversion rights, contingent share agreement, stockholders
agreement, partnership agreement or otherwise, any capital stock or other equity
securities or securities convertible into shares of capital stock or other
equity securities.

          5.6  Subsidiaries.  The Borrower has no Subsidiaries.
               ------------                                    

          5.7  Title to Properties; Patents, Trademarks, Etc. The Borrower has,
               ----------------------------------------------                  
and will have after giving effect to the closing under the Purchase Agreement,
good and marketable title to all of its material assets, whether real or
personal, tangible or intangible, free and clear of any Liens or adverse claims
or interests, except Permitted Liens.  The Borrower owns or possesses, and will
own or possess after giving effect to the closing under the Purchase Agreement,
the valid right to use all 

                                      -37-
<PAGE>
 
the material patents, trademarks, service marks, trade names, copyrights and
licenses and rights in respect of the foregoing necessary for the conduct of its
business, without any known conflict with the rights of others.

          5.8  Litigation; Proceedings.  Except as disclosed on Exhibit G
               -----------------------                          ---------
attached hereto, there is no action, suit, proceeding, inquiry or investigation
at law or in equity, or by or before any court or governmental instrumentality
or agency, nor any order, decree or judgment in effect, now pending or, to the
best of the Borrower's knowledge, threatened against or affecting the Borrower,
any Material Towers or any of the properties or rights relating to any Material
Towers, which could reasonably be expected to have a Material Adverse Effect.
Except as disclosed on Exhibit G hereto, there is no application, petition,
                       ---------                                           
complaint, proceeding or investigation pending or, to the best of the Borrower's
knowledge, threatened, with respect to any License or which could restrict in
any material manner the ownership, operation or license status of any Material
Towers.

          5.9  Taxes.  All Federal, state and local tax returns, reports and
               -----                                                        
statements (including, without limitation, those relating to income taxes,
withholding, social security and unemployment taxes, sales and use taxes and
franchise taxes) required to be filed by the Borrower have been properly filed
with the appropriate governmental agencies in all jurisdictions in which such
returns, reports and statements are required to be filed, which returns, reports
and statements are complete and accurate, and all taxes and other impositions
due and payable have been timely paid prior to the date on which any fine,
penalty, interest, late charge or loss may be added thereto for non-payment
thereof.  As of the date hereof, the Borrower has not filed with the Internal
Revenue Service or any other governmental authority any agreement or other
document extending or having the effect of extending the period for assessment
or collection of any Federal, state, local or foreign taxes or other
impositions. All tax deficiencies asserted or assessments made as a result of
any examinations conducted by the Internal Revenue Service or any other
governmental authority relating to the Borrower have been fully paid or are
being contested in accordance with the provisions of Section 7.4.  Proper and
accurate amounts have been withheld by the Borrower from its employees for all
periods to fully comply with the tax, social security and unemployment
withholding provisions of applicable Federal, state, local and foreign law.  The
charges, accruals and reserves on the books of the Borrower in respect of any
taxes or other governmental charges for the Borrower are adequate.

          5.10  Absence of Conflicts. The execution, delivery and performance of
                --------------------
the Purchase Agreement, this Agreement and the Collateral Documents and all
actions and transactions contemplated hereby and thereby will not (a) violate,
be in 

                                      -38-
<PAGE>
 
conflict with, result in a breach of or constitute (with due notice or lapse of
time or both) a default under (i) any provision of the Certificate of
Incorporation or By-laws of the Borrower, (ii) any arbitration award or any
order of any court or of any other governmental agency or authority, (iii) any
License relating to any Material Towers or under which the Borrower operates or
will operate after giving effect to the closing under the Purchase Agreement
which breach or default of such License could reasonably be expected to have a
Material Adverse Effect, or (iv) any applicable law, rule, order or regulation
(including without limitation, (A) any law, rule, regulation or policy of the
FAA or any other Licensing Authority or (B) Regulations G, T, U or X of the
Board of Governors of the Federal Reserve System) or any material agreement,
instrument or document relating to any Material Towers or to which the Borrower
is a party, or by which the Borrower or any of its properties is bound,
including, without limitation, the License Agreement or any of the leases
relating to Material Towers, or (b) result in the creation or imposition of any
Lien of any nature whatsoever, other than those Liens arising hereunder or under
the Collateral Documents, upon any of the properties of the Borrower.

          5.11  Indebtedness.  The Borrower has no Indebtedness of any nature,
                ------------                                                  
whether due or to become due, absolute, contingent or otherwise, including
Indebtedness for taxes and any interest or penalties relating thereto, except
(a) liabilities reflected in the Financial Statements, (b) the liability to pay
legal and accounting fees and reasonable closing expenses in connection with
this Agreement and the Purchase Agreement, (c) to the extent disclosed on
                                                                         
Exhibit H attached hereto and (d) Indebtedness permitted pursuant to Section
- ---------                                                                   
8.1.

          5.12  Compliance.  Except as disclosed on Exhibit G attached hereto,
                ----------                          ---------                 
neither the Borrower nor, to the best of the Borrower's knowledge, either
Seller, is in violation of any statute, ordinance, law, rule, regulation or
order of the United States of America, the FAA, or any other federal, state,
county, municipal or other governmental agency or authority applicable to it,
its properties, the maintenance of any Material Towers or the conduct of its
business, which violation could reasonably be expected to have a Material
Adverse Effect.  The Borrower has not violated or breached in any material
respect the provisions of any material indenture, License, agreement, note,
lease or other instrument or document to which it is a party or by which it is
bound, nor does there exist any material default, or any event or condition
which, upon notice or lapse of time, or both, would become a material default,
under any such material indenture, License, agreement, note, lease, or other
instrument or document. The Borrower has the legal right and authority,
including without limitation, necessary authorizations from the FAA, to conduct
its business as now conducted or proposed to be conducted.

                                      -39-
<PAGE>
 
          5.13  Statements Not Misleading.  No statement, representation or
                -------------------------                                  
warranty made by the Borrower or any other party (other than the Agent and the
Banks) in or pursuant to this Agreement or the Exhibits attached hereto or any
of the Collateral Documents contains or will contain any untrue statement of a
material fact, nor omits or will omit to state a material fact necessary to make
such statement not misleading or otherwise violates any federal or state
securities law, rule or regulation.  There is no fact known to the Borrower
(other than matters of a general economic nature) that has had or could
reasonably be expected to have a Material Adverse Effect and that has not been
disclosed herein.

          5.14  Consents or Approvals.  No consent, approval or authorization 
                ---------------------
of, or filing, registration or qualification with, any governmental authority or
any other Person (including, without limitation, the FAA or any other Licensing
Authority) is required to be obtained by the Borrower in connection with the
execution, delivery or performance of the Purchase Agreement, this Agreement or
any of the Collateral Documents, including, without limitation, in connection
with the granting of liens and security interests in the assets of the Borrower
and in the capital stock of the Borrower, which has not already been obtained or
completed, except for the filing of financing statements and the Mortgages and
other actions expressly required to be taken pursuant to the Collateral
Documents.

          5.15  Material Contracts and Commitments.  Exhibit I attached hereto
                ----------------------------------   ---------                
contains a true and complete description of all material contracts and
commitments of the Borrower as of the Closing Date (after giving effect to the
closing under the Purchase Agreement), whether oral or written, including,
without limitation, (a) those governing any Indebtedness; (b) any security
agreement, pledge agreement, mortgage or guaranty; (c) management, construction
supervision, service or employment agreements, conditional sales contracts or
leases of real or personal property, which involve expenditures in excess of
$50,000 in any single case; (d) collective bargaining agreements; (e) contracts
or commitments for the future purchase or sale of goods by the Borrower, other
than those which involve the payment or receipt of less than $50,000 in any
single case; (f) contracts or commitments which involve a Capital Expenditure in
excess of $50,000 in any single case; (g) bonus, pension, retirement, insurance
or other employee benefit plans; (h) all Licenses and (i) all Land Lease
Agreements.  All of the agreements, contracts and commitments listed on Exhibit
                                                                        -------
I are in full force and effect without material default.  Exhibit I further
- -                                                         ---------        
identifies each such contract which requires consent to the granting of a Lien
in favor of the Agent, for the benefit of the Banks, on the rights of the
Borrower under such contract.  The Borrower has made available to the Agent true
and complete copies of all of the agreements, contracts and commitments listed
on Exhibit I.
   --------- 

                                      -40-
<PAGE>
 
          5.16  Employee Benefit Plans.  Exhibit J contains a true and complete
                ----------------------   ---------                             
list of all Plans maintained by the Borrower or any member of the Controlled
Group.  Neither the Borrower nor any member of the Controlled Group has or will
have, as of the closing under the Purchase Agreement, any liability, or
reasonably anticipates any liability, of any kind in excess, in the aggregate,
of $50,000, to or in respect of any Plan or Benefit Arrangement.  With respect
to the Plans and Benefit Arrangements currently maintained by the Borrower or
any member of the Controlled Group: (a) each Plan that is intended to be
qualified under Code Section 401(a) is so qualified and has been so qualified
since its adoption, and each trust forming a part thereof is exempt from tax
under Code Section 501(a); (b) each Plan complies in all material respects with
all applicable requirements of law, has been administered in accordance with its
terms and all required contributions have been made; (c) neither the Borrower
nor any member of the Controlled Group knows or has reason to know that the
Borrower or any member of the Controlled Group has engaged in a transaction
which would subject it to any tax, penalty or liability under ERISA or the Code
for any prohibited transaction; (d) no Plan is subject to the minimum funding
requirements under ERISA Section 302 or Code Section 412, is a multiemployer
plan (as defined in ERISA Section 4001(a)(3)), is a defined benefit plan (as
defined under ERISA Section 3(35) or Code Section 414(j)), or is a multiple
employer plan (as defined in ERISA Section 4063).  No Plan or Benefit
Arrangement maintained by the Borrower or any member of the Controlled Group is
a multiple employer welfare arrangement (as defined in ERISA Section 3(40)).

          5.17  Licenses.  The Licenses shown on Exhibit I constitute all of the
                --------                         ---------                      
Licenses which are necessary for the lawful operation of the business of the
Borrower (after giving effect to the closing under the Purchase Agreement) in
the manner and to the full extent they are currently operated.  Exhibit I sets
                                                                ---------     
forth a correct and complete list of each pending application for a License
filed by the Borrower.  All of the FAA Licenses have been duly and validly
issued to and are legally held by the Borrower and are in full force and effect
without condition except those of general application.  The Licenses have been
issued in compliance with all applicable laws and regulations, are legally
binding and enforceable in accordance with their terms and are in good standing.
The Borrower knows of no facts or conditions which would constitute grounds for
any Licensing Authority to deny any pending material application for a License,
to suspend, revoke, materially adversely modify or annul any License or to
impose a material financial penalty on the Borrower.

          5.18  Material Restrictions.  The Borrower is not a party to any
                ---------------------                                     
agreement or other instrument or subject to any other restriction which
materially and adversely affects or could 

                                      -41-
<PAGE>
 
materially and adversely affect its business, property, assets, operations or
condition, financial or otherwise.

          5.19  Investment Company Act.  The Borrower (a) is not an investment
                ----------------------                                        
company as that term is defined in the Investment Company Act of 1940, as
amended, (b) does not directly or indirectly control, and is not directly or
indirectly controlled by a company which is an investment company as that term
is defined in such act and (c) is not otherwise subject to regulation under such
act.

           5.20  Absence of Material Adverse Changes. No Material Adverse Effect
                 -----------------------------------
has occurred.

           5.21  Defaults. No Possible Default or Event of Default now exists or
                 --------
will exist upon the making of any Loan.

           5.22  Real Property. Exhibit K attached hereto lists as of the
                 -------------  ---------
Closing Date (a) all real estate owned by the Borrower or which the Borrower
will acquire pursuant to the Purchase Agreement and all leases pursuant to which
the Borrower has acquired or will acquire pursuant to the Purchase Agreement a
leasehold interest in real estate, (b) all such leases that have been recorded
in the real property records of any jurisdiction, (c) all such owned and leased
property for which the Borrower has obtained title insurance or a commitment for
title insurance and (d) the use of such owned and leased property in the
Borrower's operations and the Borrower's good faith estimate of the fair market
value of each such owned parcel.

           5.23  Securities Laws.  No proceeds of any Loan will be used by the
                 ---------------                                              
Borrower to acquire any security in any transaction which is subject to Section
13 or 14 of the Securities Exchange Act of 1934, as amended.  Neither the
registration of any security under the Securities Act of 1933, as amended, or
the securities laws of any state, nor the qualification of an indenture in
respect thereof under the Trust Indenture Act of 1939, as amended, is required
in connection with the consummation of this Agreement or the Purchase Agreement.

           5.24  Insurance. All policies of insurance of any kind or nature
                 ---------
owned by or issued to the Borrower, including, without limitation, policies of
fire, theft, public liability, property damage, other casualty, employee
fidelity, worker's compensation, employee health and welfare, title, property
and liability insurance, are in full force and effect and are of a nature and
provide such coverage as is sufficient and as is customarily carried by
companies of the size and character of the Borrower and engaged in a similar
business. In the past three years, the Borrower has not been refused insurance
for which it applied or had any policy of insurance terminated (other than at
its request).

                                      -42-
<PAGE>
 
           5.25  Labor Disputes.  There are no strikes or other material labor
                 --------------                                               
disputes or grievances pending against the Borrower.  To the best knowledge of
the Borrower, there are no such strikes and no such disputes threatened which
could reasonably be expected to have a Material Adverse Effect.  There are no
material unfair labor practice charges or grievances pending or in process or,
to the best knowledge of the Borrower, threatened by or on behalf of any
employee or group of employees of the Borrower.  The Borrower has not received
any written complaints, and has no knowledge of any threatened complaints, nor
to the best of the Borrower's knowledge are any such complaints on file with any
Federal, state or local governmental agency, alleging employment discrimination
by the Borrower.  All payments due from the Borrower pursuant to the provisions
of any collective bargaining agreement have been paid or accrued as a liability
on the books of the Borrower.

            5.26  Environmental Compliance.
                  ------------------------ 

                  (a)  The Borrower has obtained all material permits, licenses
and other authorizations which are required under all Environmental Laws. The
Borrower is in material compliance with all terms and conditions of all such
permits, licenses and authorizations, and is also in material compliance with
all other limitations, restrictions, conditions, standards, prohibitions,
requirements, obligations, schedules and timetables contained in any applicable
Environmental Law or in any regulation, code, plan, order, decree, judgment,
injunction, notice or demand letter issued, entered, promulgated or approved
thereunder, including, without limitation, all Environmental Laws in all
jurisdictions in which the Borrower owns, maintains or manages a Tower, a
facility or site, arranges or has arranged for disposal or treatment of
Hazardous Materials, solid waste or other wastes, accepts or has accepted for
transport any Hazardous Materials, solid waste or other wastes or holds or has
held any interest in real property or otherwise.

                  (b) No Environmental Claim has been issued, no complaint has
been filed, no penalty has been assessed and no litigation, proceeding,
investigation or review is pending or, to the best of the Borrower's knowledge,
threatened by any Person with respect to any alleged failure by the Borrower to
comply with any Environmental Law or to have any permit, license or
authorization required in connection with the conduct of the business of the
Borrower or with respect to any generation, treatment, storage, recycling,
transportation, use, disposal or Release of any Hazardous Materials generated by
the Borrower or with respect to any real property in which the Borrower holds or
has held an interest or any past or present operation of the Borrower.

                                      -43-
<PAGE>
 
                  (c) There are no Environmental Laws requiring any material
work, repairs, construction, Capital Expenditures or other remedial work of any
nature whatsoever, with respect to any real property in which the Borrower holds
or has held an interest or any past or present operation of the Borrower.

                  (d) To the best of the Borrower's knowledge, the Borrower has
not handled any Hazardous Material, on any property now or previously owned or
leased by the Borrower to an extent that it has, or could reasonably be expected
to have, a Material Adverse Effect, and to the best of the Borrower's knowledge,
except as could not reasonably be expected to have a Material Adverse Effect:

                      (i)   no PCBs are present at any property now or
previously owned or any premises now or previously leased by the Borrower;

                      (ii)  no asbestos is present at any property now or
previously owned or any premises now or previously leased by the Borrower;

                      (iii) no underground storage tanks for Hazardous
Materials, active or abandoned, are now or were previously operated at any
property now or previously owned by the Borrower, and, with respect to premises
now or previously leased by the Borrower, no underground storage tanks for
Hazardous Materials, active or abandoned, are now or were previously operated by
the Borrower;

                      (iv)  no Hazardous Materials have been Released, in a
reportable quantity, where such a quantity has been established by statute,
ordinance, rule, regulation or order, at, on or under any property now or
previously owned by the Borrower; and

                      (v)   no Hazardous Materials have been otherwise Released
at, on or under any property now or previously owned or any premises now or
previously leased by the Borrower.

                  (e) The Borrower has not transported or arranged for the
transportation of any material amount of Hazardous Material to any location that
is listed on the National Priorities List ("NPL") under the Comprehensive
Environmental Response, Compensation and Liability Act of 1980, as amended
("CERCLA"), listed for possible inclusion on the NPL by the Environmental
Protection Agency in the Comprehensive Environmental Response and Liability
Information System, as provided for by 40 C.F.R. (S)300.5 ("CERCLIS"), or on any
similar state or local list or that is the subject of Federal, state or local
enforcement actions or other investigations that may lead to any material
Environmental Claims against the Borrower.

                                      -44-
<PAGE>
 
                  (f) No material amount of Hazardous Material generated by the
Borrower has been recycled, treated, stored, disposed of or Released by the
Borrower at any location.

                  (g) No oral or written notification of a Release of any
material amount of a Hazardous Material has been filed by or on behalf of the
Borrower and no property now, or, to the best of the Borrower's knowledge,
previously, owned or leased by the Borrower is listed or proposed for listing on
NPL or on any similar state list of sites requiring investigation or clean-up.

                  (h) There are no Liens arising under or pursuant to any
Environmental Laws on any of the property owned or premises leased by the
Borrower, and no government actions have been taken or are in process which
could subject any of such property to such Liens, and the Borrower would not be
required to place any notice or restriction relating to the presence of
Hazardous Materials at any property owned by it in any deed to such property.

                  (i) The Borrower has not retained or assumed any liabilities
(contingent or otherwise) in respect of any Environmental Claims (i) under the
terms of any contract or agreement or (ii) by operation of law as a result of
merger, consolidation or the sale, exchange or contribution of assets or stock.

                  (j) There have been no environmental investigations, studies,
audits, tests, reviews or other analyses conducted by or which are in the
possession of the Borrower in relation to any property or facility now or
previously owned or leased by the Borrower which have not been disclosed in
writing and made available to the Banks.

          5.27  Solvency.  The Borrower has received, or has the right hereunder
                --------                                                        
to receive, consideration which is the reasonable equivalent value of the
obligations and liabilities that the Borrower has incurred to the Banks.  The
Borrower is not insolvent as defined in Section 101 of Title 11 of the United
States Code or any applicable state insolvency statute, nor, after giving effect
to the consummation of the transactions contemplated herein, will the Borrower
be rendered insolvent by the execution and delivery of this Agreement, the Notes
or the Collateral Documents to the Banks or the consummation of the Purchase
Agreement.  The Borrower is not engaged, and is not about to engage, in any
business or transaction for which the assets retained by it shall be an
unreasonably small capital, taking into consideration the obligations to the
Banks incurred hereunder.  The Borrower does not intend to, and does not believe
that it will, incur debts beyond its ability to pay them as they mature.

                                      -45-
<PAGE>
 
          5.28  Purchase Agreement.  The Borrower has provided to the Agent a
                ------------------                                           
complete and correct copy of the Purchase Agreement, together with all exhibits
thereto.  To the best of the Borrower's knowledge, all of the representations
and warranties of the Sellers in the Purchase Agreement are true and correct in
all material respects as of the date hereof as if given as of the date hereof.
No party to the Purchase Agreement has given notice of any breach of its
representations or agreements therein.  All of the representations and
warranties of the Borrower in this Section 5 shall be deemed to be given as of
the moment following consummation of the closing under the Purchase Agreement,
and the Towers being acquired pursuant to the Purchase Agreement shall be deemed
to be Towers for all purposes of these representations and warranties.


 SECTION 6.    CONDITIONS PRECEDENT TO OBLIGATIONS OF THE BANKS.
               ------------------------------------------------ 

          The obligations of the Banks to make the initial Loans on the Closing
Date, to issue any Letter of Credit and to make any subsequent Loan are subject
to the fulfillment or waiver in writing of each of the following conditions
precedent.  The Borrower shall deliver to the Agent copies for each Bank of each
document, instrument or other item to be delivered pursuant to this Section 6.

          6.1  Compliance.  All of the representations and warranties of the
               ----------                                                   
Borrower herein and in the Collateral Documents shall be true in all material
respects on and as of the Closing Date, the date of issuance of any Letter of
Credit and the date of any subsequent Loan (other than a Loan resulting from the
funding of a Letter of Credit), as if made on and as of such date.  The Borrower
shall be in compliance with all the provisions of this Agreement and each
Collateral Document, and no Possible Default or Event of Default shall have
occurred and be continuing.  On the Closing Date and on the date of each
subsequent Loan (other than a Loan resulting from the funding of a Letter of
Credit) and the date of issuance of any Letter of Credit, the Borrower shall
deliver to the Banks a certificate, dated as of such date, and signed by the
President or the chief financial officer of the Borrower, certifying compliance
with the conditions of this Section 6.1.  Each request by the Borrower for a
Loan shall, in and of itself, constitute a representation and warranty that the
Borrower, as of the date of such Loan, is in compliance with this Section.

          6.2  Security Agreement.  The Borrower shall have executed and
               ------------------                                       
delivered to the Agent a Security Agreement (the "Security Agreement"), in form
and substance satisfactory to the Agent, granting to the Agent, for the benefit
of the Banks, a perfected, first priority security interest in substantially all
of the personal property of the Borrower, in form and substance 

                                      -46-
<PAGE>
 
satisfactory to the Agent; and the Security Agreement, and the security
interests granted pursuant thereto, shall be in full force and effect.

           6.3  Guaranty and Pledge Agreements.
                ------------------------------ 

                (a)  Holdco shall have executed and delivered to the Agent a
Guaranty (the "Guaranty"), in form and substance satisfactory to the Agent, of
all of the Borrower's Obligations hereunder, under the Notes and under each
Collateral Document.

                (b)  Holdco shall have executed and delivered to the Agent a
Pledge Agreement (the "Holdco Pledge Agreement"), in form and substance
satisfactory to the Agent, granting to the Agent, for the benefit of the Banks,
a perfected, first priority security interest in all of the issued and
outstanding shares of capital stock of the Borrower; and Holdco shall have
delivered to the Agent stock certificates evidencing all of such shares and duly
executed blank stock powers in respect thereof and shall have taken all other
actions as may be required to effect the grant and perfection of the Agent's
security interest in such stock; and the Holdco Pledge Agreement, and the
security interests granted pursuant thereto, shall be in full force and effect.

                (c)  Centennial Fund IV, L.P. shall have executed and delivered
to the Agent a Pledge Agreement (the "Stockholder Pledge Agreement"), in form
and substance satisfactory to the Agent, granting to the Agent, for the benefit
of the Banks, a perfected, first priority security interest in all of the notes
evidencing the Stockholder Debt; and Centennial Fund IV, L.P. shall have
delivered to the Agent all of such notes and shall have taken all other actions
as may be required to effect the grant and perfection of the Agent's security
interest in such notes; and the Stockholder Pledge Agreement, and the security
interests granted pursuant thereto, shall be in full force and effect.

           6.4  Real Property Matters.
                --------------------- 

                (a)  With respect to each parcel of real property owned by the
Borrower, including real property being acquired pursuant to the Purchase
Agreement, the Borrower shall have executed and delivered a first priority
mortgage or deed of trust, in form and substance satisfactory to the Agent,
covering such parcel of real property.  With respect to each parcel of real
property leased by the Borrower, including real property being acquired pursuant
to the Purchase Agreement, the Borrower shall have executed and delivered a
first priority leasehold mortgage or collateral assignment of lease, in form and
substance satisfactory to the Agent, covering such leasehold interest. Such
mortgages, deeds of trust, leasehold mortgages and 

                                      -47-
<PAGE>
 
collateral assignments of leases may be referred to hereinafter collectively as
the "Mortgages". Each Mortgage covering owned property and each Mortgage
covering leased property in respect of which a lease or memorandum of lease has
been recorded in the real property records of the jurisdiction where the leased
property is located shall have been duly recorded, and the Borrower shall have
paid all taxes, fees or charges incurred in connection with the execution or
recording thereof.

                (b)  The Borrower shall have procured and delivered to the Agent
a commitment from a title insurance company satisfactory to the Agent for an
ALTA mortgagee's policy of title insurance (Form 1970 if available, or 1984 or
1990 with 1970 Endorsement or state equivalent) covering each parcel of owned or
leased real property which is subject to a Mortgage that shall have been duly
recorded pursuant to Section 6.4(a), which policy shall be for the benefit of
the Agent on behalf of the Banks and reasonably satisfactory to the Agent and
shall insure that such Mortgage is a valid first mortgage lien on the property
covered thereby. Such policy shall, to the extent available and appropriate: (i)
insure title to the real property and all recorded easements benefitting such
real property, (ii) contain a commercial revolving line of credit endorsement
insuring that advances made subsequent to the date of the title insurance policy
are included in the title coverage, not to exceed the face amount of the title
policy, (iii) contain a last dollar endorsement insuring that the Banks may
apply all payments from Borrower to the release of security or collateral other
than the real property until the aggregate outstanding indebtedness equals the
face amount of the title insurance policy and (iv) contain first loss
endorsement insuring the Agent may realize upon the real property without
requiring maturity of the entire indebtedness by acceleration and regardless of
the existence of and without pursuing other security or collateral. No title
indemnities shall be established in connection with the issuance of the
aforesaid lender's title insurance policy.

                (c)  With respect to each parcel of real property owned by the
Borrower, including real property being acquired pursuant to the Purchase
Agreement, with respect to which the Borrower has granted a Mortgage to the
Agent, for the benefit of the Banks, the Borrower shall have procured and
delivered to the Agent evidence as to whether such parcel of property is located
within a flood hazard area for purposes of the National Flood Insurance Act of
1968, as amended.

                (d)  The Borrower shall obtain from each lessor under a lease,
in respect of which lease the Borrower has granted to the Agent, for the benefit
of the Banks, a Mortgage, written consent to such grant in form and substance
satisfactory to the Agent, to the extent such lease requires such consent.

                                      -48-
<PAGE>
 
                (e)  The Borrower shall have provided to the Agent a copy of the
environmental report (transaction screen) prepared by Arter, Hadden, Johnson &
Bromberg in January, 1995.

          6.5  Financing Statements.  Any financing statements or fixture
               --------------------                                      
filings required by the Security Agreement and the Mortgages shall have been
filed for record with the appropriate governmental authorities.

          6.6  Subordination Agreements.  The Sellers shall have executed and
               ------------------------                                      
delivered to the Agent a Subordination Agreement (the "Sellers Subordination
Agreement"), in form and substance satisfactory to the Agent, in favor of the
Agent, for the benefit of the Banks, and Centennial Fund IV, L.P. shall have
executed and delivered to the Agent a Subordination Agreement (the "Stockholder
Subordination Agreement"), in form and substance satisfactory to the Agent, in
favor of the Agent, for the benefit of the Banks.  The Borrower shall have
caused to be delivered to the Agent a certificate in form and substance
satisfactory to the Agent calculating the amount of Stockholder Debt that must
be secured in order for the Borrower not to be deemed to be a "United States
Real Property Holding Corporation" for purposes of Section 897 of the Code.
Centennial Fund IV, L.P. shall have delivered to the Agent executed but undated
releases, in form and substance satisfactory to the Agent, of all Liens held by
it securing Stockholder Debt, which the Agent shall have the right to file for
record upon the occurrence and during the continuance of an Event of Default.

          6.7  Assignment of Seller Escrow Deposit.  The Borrower shall deliver
               -----------------------------------                             
to the Agent an assignment, in form and substance satisfactory to the Agent, of
the Seller Escrow Deposit, and all of the Borrower's rights therein, in favor of
the Agent, for the benefit of the Banks.

          6.8  Consummation of Purchase Agreement.
               ---------------------------------- 

               (a)  The transactions contemplated by the Purchase Agreement
shall have been consummated, or shall be so consummated simultaneously with the
making of the initial Loans hereunder, without the waiver of any material term
or condition by any party thereto. Without limiting the foregoing sentence, the
Borrower shall have acquired from the Sellers all of the Sites (as that term is
defined in the Purchase Agreement) free and clear of all Liens, except Permitted
Liens, except for any Sites with respect to which the Agent has approved the
Borrower's decision not to acquire such Site. No Site acquired by the Borrower
shall have any Defect (as that term is defined in the Purchase Agreement) except
as approved by the Agent. The consummation of the transactions contemplated by
the Purchase Agreement shall be completed in a manner satisfactory to the Agent
and its counsel, who shall be present at the closing thereof and shall receive

                                      -49-
<PAGE>
 
conformed copies or photocopies of all documents relating thereto, including,
without limitation, copies of all conveyance documents and financial information
delivered by the parties to the Purchase Agreement. The Borrower shall use its
best efforts to cause all opinions and certificates of the Sellers delivered in
connection with such closing to be addressed to the Banks.

                (b)  As of the Closing Date, the Borrower shall have submitted
to the Agent (i) a list of all Sites which have not been acquired by the
Borrower as of the Closing Date and a statement of the reduction to the purchase
price payable under the Purchase Agreement relating to such non-transferred
Sites and (ii) a list of all Defects (as that term is defined in the Purchase
Agreement) which have not been cured and which relate to Sites which have been
transferred to the Borrower, and all such submissions shall be satisfactory to
the Agent.

                (c)  The Promissory Note dated January 10, 1995, by the Borrower
to the Sellers in the principal amount of $8,031,330 shall have been paid down
to an outstanding principal amount of less than $1,000,000 (or shall be so paid
with the proceeds of the initial Loan hereunder) and all security granted by the
Borrower to the Sellers securing the PCI Debt shall have been released and
terminated.

           6.9  No Indebtedness.  The Agent shall have received evidence
                ---------------                                         
satisfactory to it that (a) the Borrower shall have no Indebtedness to any
Stockholder, any Affiliate of the Borrower or any Affiliate of any Stockholder
(other than the Stockholder Debt), (b) all Liens in favor of any Stockholder
(other than Centennial Fund IV, L.P.) in any assets of the Borrower shall have
been terminated and released and (c) the Liens securing the Stockholder Debt
held by Centennial Fund IV, L.P. shall have been subordinated to all of the
Obligations.

           6.10 Opinion of Borrower's and Stockholder's Counsel. On the Closing
                -----------------------------------------------                
Date, the Agent shall have received the favorable written opinions of general
counsel to the Borrower and Centennial Fund IV, L.P. and of counsel to the
Borrower in the States of Texas, New Mexico and Arizona, in each case dated the
Closing Date, addressed to the Banks and in form and substance satisfactory to
the Agent.

           6.11 Insurance Certificates. The Borrower shall have furnished to the
                ----------------------
Agent on or prior to the Closing Date certificates of insurance together with
copies of all policies or other satisfactory evidence that the insurance
required by Section 7.3 is in full force and effect.

                                      -50-
<PAGE>
 
           6.12  Financial Information.  On the Closing Date, the Borrower shall
                 ---------------------                                          
have delivered to the Agent a pro forma balance sheet and income statement as of
the Closing Date giving effect to the closing under the Purchase Agreement.

           6.13  Engineer's Report.  The Agent shall have received from the
                 -----------------                                         
Borrower an engineering report from an engineer, satisfactory to the Agent,
acceptable in form and substance to the Agent, with respect to the construction,
engineering and maintenance of the Towers.

           6.14  Borrowing Request, Statement of Application of Proceeds and
                 -----------------------------------------------------------
Acquisition Advance Worksheet.  The Borrower shall have delivered to the Agent
- -----------------------------                                                 
in respect of each Loan a borrowing request, in form and substance satisfactory
to the Agent, setting forth the application of the proceeds of the requested
Loan, evidence that such application is permitted pursuant to Sections 2 and
7.1, the recipient of such proceeds and wire transfer instructions.  The initial
Borrowing Request shall also set forth the Borrower's estimate of closing costs
incurred in connection with this transaction and the Purchase Agreement.  The
Borrower shall have delivered to the Agent the Acquisition Advance Worksheet, as
required pursuant to Section 2.4(d)(iii), in advance of any borrowing the
proceeds of which will be used for a Qualified Acquisition.

           6.15  Rate Hedging Obligations.  On the Closing Date, the Borrower
                 ------------------------                                    
shall have entered into agreements in form and substance reasonably satisfactory
to the Agent regarding Rate Hedging Obligations so that the notional amount
subject to such agreements equals at least 67% of the principal amount of the
Loans then outstanding for an average maturity of three years.

           6.16  Corporate Documents.  On the Closing Date, the Borrower shall
                 -------------------                                          
deliver to the Agent the following:

                 (a)  certificates of good standing for the Borrower from the
Secretary of State of each of the States of Delaware, Texas, Colorado, New
Mexico, Arizona, Oklahoma and Nevada and from the Secretary of State of each
other state in which the Borrower is qualified to do business, in each case
dated as of a date as near to the Closing Date as practicable;

                 (b)  a certificate signed by the Secretary or Assistant
Secretary of the Borrower dated as of the Closing Date certifying that attached
thereto are true and complete copies of (i) the Certificate of Incorporation and
By-Laws of the Borrower, (ii) the Certificate of Incorporation and By-Laws of
Holdco, (iii) the Purchase Agreement, the Securities Purchase Agreement (as
amended), the Securities Exchange Agreement among the Borrower, Holdco and the
Stockholders, the Stockholders Agreement, the License Agreement and the
Management Agreement, 

                                      -51-
<PAGE>
 
and (iv) resolutions adopted by its Board of Directors and by Holdco and the
Stockholders, if necessary, authorizing the execution, delivery and performance
of the Borrower of the Purchase Agreement, this Agreement and the Collateral
Documents to which it is a party and the Obligations to be performed by the
Borrower hereunder and thereunder;

                 (c)  an incumbency certificate for the Borrower; and

                 (d)  such other documents as any Bank may reasonably request in
connection with the proceedings taken by the Borrower, Holdco or the
Stockholders authorizing this Agreement, the Collateral Documents and the
transactions contemplated hereby, to the extent it is a party thereto.

          6.17   Consents and Releases of Liens. The Agent shall have received
                 ------------------------------
on or prior to the Closing Date: (a) consents to the granting of Liens in all
material Licenses and other material contracts and leases (other than the Land
Lease Agreements, except as provided in Section 6.4(d)) of the Borrower which by
their terms require such consent, and (b) releases of any existing Liens
encumbering any of the Borrower's assets (including, without limitation, assets
being acquired pursuant to the Purchase Agreement and the Land Lease
Agreements), except for Permitted Liens.

          6.18   Fees and Expenses.  The Borrower shall have paid all fees,
                 -----------------                                         
expenses and other amounts which are due pursuant hereto or pursuant to any
separate fee agreement with the Agent on or prior to the date of such initial or
subsequent Loan.

          6.19   Legal Approval. All legal matters incident to this Agreement
                 --------------
and the consummation of the transactions contemplated hereby shall be reasonably
satisfactory to Dow, Lohnes & Albertson, special counsel to the Banks.

          6.20   Other Documents.  The Agent shall have received all Collateral
                 ---------------                                               
Documents duly executed, and each Bank shall have received such other
certificates, opinions, agreements and documents, in form and substance
satisfactory to it, as it may reasonably request.


 SECTION 7.    AFFIRMATIVE COVENANTS OF THE BORROWER.
               ------------------------------------- 

          So long as this Agreement remains in effect or any of the Obligations
remain unpaid or to be performed, or any Letter of Credit remains outstanding,
the Borrower shall perform and comply with the affirmative covenants contained
in this Section.

           7.1  Use of Proceeds.
                --------------- 

                                      -52-
<PAGE>
 
                (a)  The Borrower shall use the proceeds of the Reducing Loans
only as follows: (i) [$____________] shall be used at Closing to pay a portion
of the purchase price pursuant to the Purchase Agreement and to pay all fees and
expenses in connection with the transactions contemplated by the Purchase
Agreement, (ii) to voluntarily prepay the Term Loans, subject to satisfaction of
the provisions of Section 2.7(a)(ii), (iii) for Qualified Acquisitions on or
prior to June 30, 1997, and (iv) for Capital Expenditures made pursuant to the
last sentence of Section 8.7.

                (b)  The Borrower shall use the proceeds of the Working Capital
Loans only for working capital purposes.

                (c)  The Borrower shall use the proceeds of the Term Loans only
to pay a portion of the purchase price pursuant to the Purchase Agreement.

          7.2  Continued Existence; Compliance with Law.  The Borrower shall do
               ----------------------------------------                        
or cause to be done all things necessary to preserve, renew and keep in full
force and effect its existence and its material rights, Licenses and Land Lease
Agreements. Without limiting the generality of the foregoing, the Borrower shall
obtain and maintain and preserve in full force and effect any and all material
Licenses and Land Lease Agreements and other material contracts necessary to
maintain, operate and manage the Towers, not breach or violate the same, and
take all actions which may be required to comply in all material respects with
all laws, statutes, rules, regulations, orders and decrees now in effect or
hereafter promulgated by any governmental authority. The Borrower shall obtain,
renew and extend all of the foregoing rights, franchises, permits, Licenses,
Land Lease Agreements and the like which may be necessary for the continuance of
the operation, maintenance and management of the Towers.

          7.3  Insurance.  The Borrower shall keep its insurable properties
               ---------                                                   
insured to the full replacement cost thereof at all times by financially sound
and reputable insurers acceptable to the Agent, and maintain such other
insurance, to such extent and against such risks, including fire, lightning,
vandalism, malicious mischief, flood (if the Borrower's property is located in
an identified flood hazard area, in which insurance has been made available
pursuant to the National Flood Insurance Act of 1968) and other risks insured
against by extended coverage, as is customary with companies engaged in the same
or similar business similarly situated.  All such insurance shall be in amounts
sufficient to prevent the Borrower from becoming a coinsurer, shall name the
Agent, for the benefit of the Banks, as loss payee and may contain loss
deductible provisions of not to exceed $25,000.  The Borrower shall maintain in
full force and effect liability insurance and general accident and public
liability insurance against claims for personal or bodily injury, death or

                                      -53-
<PAGE>
 
property damage occurring upon, in, about or in connection with the use or
operation of any property or motor vehicles owned, occupied, controlled or used
by the Borrower and its employees or agents, or arising in any other manner out
of the business conducted by the Borrower.  All of such insurance shall be in
amounts reasonably satisfactory to the Agent and shall be obtained and
maintained by means of policies with generally recognized, responsible insurance
companies authorized to do business in such states as may be necessary depending
upon the locations of the Borrower's assets and shall name the Agent, for the
benefit of the Banks, as an additional insured or loss payee, as the case may
be.  The insurance to be provided may be blanket policies.  Each policy of
insurance shall be written so as not to be subject to cancellation or
substantial modification without not less than thirty days advance written
notice to the Agent. The Borrower shall furnish the Agent annually with
certificates or other evidence satisfactory to the Agent that the insurance
required hereby has been obtained and is in full force and effect and, prior to
the expiration of any such insurance, the Borrower shall furnish the Agent with
evidence satisfactory to the Agent that such insurance has been renewed or
replaced.  The Borrower shall, upon request of the Agent, furnish the Agent such
information about the Borrower's insurance as the Agent may from time to time
reasonably request.  The Agent may, in its discretion, advise the Borrower that
such insurance coverage should be increased or extended, and by what amounts,
based upon how other companies engaged in the same or similar business similarly
situated are insuring or may be insuring, and these amounts shall become the
insurance coverage required hereunder.

          7.4  Obligations and Taxes.  The Borrower shall pay or perform all of
               ---------------------                                           
its material Indebtedness and other material liabilities and obligations in a
timely manner in accordance with normal business practices and with the terms
governing the same. The Borrower shall comply with the terms and covenants of
all material agreements and all material leases of real or personal property,
including, without limitation, the Land Lease Agreements.  The Borrower shall
pay and discharge promptly all taxes, assessments and governmental charges or
levies imposed upon it or in respect of its property before the imposition of
any penalty, as well as all lawful claims for labor, materials, supplies or
other matters which, if unpaid, might become a Lien or charge upon such
properties or any part thereof; provided, however, that the Borrower shall not
                                --------  -------                             
be required to pay and discharge or cause to be paid and discharged any such
tax, assessment, charge, levy or claim so long as (a) the validity thereof is
being contested diligently and in good faith by appropriate proceedings and the
enforcement thereof is stayed, pending the outcome of such proceedings, (b) the
Borrower has set aside on its books adequate reserves (to the extent required by
GAAP or sound business practice) with respect thereto, and (c) 

                                      -54-
<PAGE>
 
such contest will not endanger the Lien of the Agent or the Banks in any of the
Borrower's assets.

          7.5  Financial Statements and Reports.  The Borrower shall maintain
               --------------------------------                              
true and complete books and records of account in accordance with GAAP.  The
Borrower shall furnish to the Agent, for delivery to the Banks, the following
financial statements, projections and notices at the following times:

               (a)  As soon as available, but in no event later than ninety days
after the end of each fiscal year of the Borrower, the Borrower shall furnish
(i) audited financial statements, including a balance sheet and income
statement, showing the financial condition of the Borrower as of the close of
such fiscal year and the results of its operations during such fiscal year,
together with a statement of cash flows of the Borrower and additional
statements, schedules and footnotes as are customary in a complete accountant's
report; such financial statements shall set forth, in comparative form,
corresponding figures for the prior year and shall be certified by nationally
recognized independent certified public accountants selected by the Borrower and
acceptable to the Agent and accompanied by the management letter of such
accountants to the Borrower, and the opinion of such accountants shall be
unqualified and in a form reasonably satisfactory to the Agent; and (ii) a
statement signed by such accountants to the effect that in connection with their
examination of such financial statements they have reviewed the provisions of
this Agreement and have no knowledge of any event or condition which constitutes
an Event of Default or Possible Default or, if they have such knowledge,
specifying the nature and period of existence thereof; provided, however, that
                                                       --------  -------      
in issuing such statement, such independent accountants shall not be required to
go beyond normal auditing procedures conducted in connection with their opinion
referred to above;

               (b)  As soon as available, but in no event later than forty-five
days after the end of each quarter of the Borrower, the Borrower shall furnish
(i) unaudited financial statements, including a balance sheet and income
statement, showing the financial condition of the Borrower as of the end of such
period and the results of its operations during such period and for the then
elapsed portion of the fiscal year, which shall be accompanied by a statement of
cash flows of the Borrower, (ii) a statement showing Capital Expenditures
(including a comparison to Capital Expenditures budgeted for such period) and
income taxes paid, each for such period, and (iii) for periods ending prior to
July 1, 1997, separate income statements for such period for all Division A
Acquisitions and Division B Acquisitions; all such financial statements shall
set forth, in comparative form, corresponding figures for the equivalent period
of the prior year and a comparison to budget for the relevant period, shall be
in form and detail satisfactory to the Agent, and shall be certified 

                                      -55-
<PAGE>
 
as to accuracy and completeness by the chief financial officer of the Borrower;

               (c)  As soon as available, but in no event later than thirty days
after the end of each month, the Borrower shall furnish an unaudited statement
of income and expense for the Borrower for such month and for the then elapsed
portion of the fiscal year, containing comparisons with the budget for such
period and with the prior year; each such statement shall be in form and detail
satisfactory to the Agent and shall be certified as to accuracy and completeness
by the chief financial officer of the Borrower;

               (d)  The financial statements required under (a) and (b) above,
shall be accompanied by a compliance certificate in the form attached hereto as
Exhibit L executed by the chief financial officer of the Borrower setting forth
- ---------
the computations showing compliance with the financial covenants set forth in
Section 8, and certifying that no Possible Default or Event of Default has
occurred, or if any Event of Default or Possible Default has occurred, stating
the nature thereof and the actions the Borrower intends to take in connection
therewith;

               (e)  The Borrower shall deliver (i) within forty-five days after
the end of each fiscal year, an annual operating budget for the Borrower for the
next succeeding fiscal year, (ii) promptly upon preparation thereof, any
material revisions of such annual budget and (iii) after each monthly period in
which there is a material adverse deviation from budget a certificate of the
chief financial officer of the Borrower explaining the deviation and the action,
if any, the Borrower has taken or proposes to take with respect thereto;

               (f)  The Borrower shall furnish (i) upon request, promptly after
the filing thereof with the Internal Revenue Service, copies of each annual
report with respect to each Plan established or maintained by the Borrower or
any member of the Controlled Group for each plan year, including (A) where
required by law, a statement of assets and liabilities of such Plan as of the
end of such plan year and statements of changes in fund balance and in financial
position, or a statement of changes in net assets available for plan benefits,
for such plan year, certified by an independent public accountant satisfactory
to the Agent, and (B) if prepared by or available to the Borrower, an actuarial
statement of such Plan applicable to such plan year, certified by an enrolled
actuary of recognized standing acceptable to the Agent; and (ii) promptly after
receipt thereof, a copy of any notice the Borrower or a member of the Controlled
Group may receive from the Department of Labor or the Internal Revenue Service
with respect to any Plan (other than notices of general application) which could
result in a material liability to the Borrower; the Borrower will promptly
notify the Agent of 

                                      -56-
<PAGE>
 
any material taxes assessed, proposed to be assessed or which the Borrower has
reason to believe may be assessed against the Borrower or any member of the
Controlled Group by the Internal Revenue Service with respect to any Plan or
Benefit Arrangement; and

          (g)  Upon the Agent's written request, such other information about
the financial condition, properties and operations of the Borrower as any Bank
may from time to time reasonably request.

          7.6  Notices.  The Borrower shall give the Agent, for distribution to
               -------                                                         
the Banks, notice (i) promptly after its receipt of notice thereof, of any
action, suit or proceeding by or against the Borrower at law or in equity, or
before any governmental instrumentality or agency, or of any of the same which
may be threatened, which, if adversely determined, could have a Material Adverse
Effect, including, without limitation, any citation or order by any Licensing
Authority or any admonition, censure or adverse citation from the FAA or any
other regulatory agency, (ii) within three days after its receipt of notice
thereof, of any action or event constituting an event of default or violation of
any License, Land Lease Agreement or other material contract to which the
Borrower is a party or by which the Borrower is bound, or any investigation,
assertion, claim or challenge relating thereto, in either case which could
reasonably be expected to have a Material Adverse Effect, (iii) within three
days after the occurrence thereof, of any Possible Default or Event of Default
and the actions the Borrower intends to take in connection therewith, (iv)
within five days after its receipt of notice thereof, of any cancellation of or
any material amendment to any of the insurance policies maintained in accordance
with the requirements of this Agreement, except for cancellations and amendments
that occur in the ordinary course of business, (v) promptly after the occurrence
thereof, of any strike, labor dispute, slow down or work stoppage due to a labor
disagreement (or any material development regarding any thereof) affecting the
Borrower which could reasonably be expected to have a Material Adverse Effect,
(vi) promptly after the occurrence thereof, of any other event, condition,
situation, occurrence or circumstance which could reasonably be expected to have
a Material Adverse Effect; (vii) promptly after its receipt of notice thereof,
of any material Environmental Claims and (viii) with respect to all rights,
franchises, permits, Licenses and the like which may be necessary for the
continuance of the operation, maintenance and management of its Towers, (A) any
citation or order relating thereto, (B) any lapse, suspension, revocation,
rescission, adverse modification or other termination thereof, (C) any alleged
breach or violation thereof by the Borrower or any other Person, (D) any
proceeding relating thereto and (E) any refusal of any Person to grant, renew or
extend the same.

                                      -57-
<PAGE>
 
          7.7  Maintenance of Property.  The Borrower shall at all times
               -----------------------                                  
maintain and preserve its Towers, machinery, equipment, motor vehicles, fixtures
and other property in good working order, condition and repair, normal wear and
tear excepted, and in compliance with all material applicable standards, rules
or regulations imposed by any governmental authority or agency (including,
without limitation, the Federal Communications Commission, the FAA and any other
Licensing Authority) or by any insurance policy held by the Borrower, except for
such property which, in the good faith judgment of the Borrower, can no longer
be profitably employed in the business of the Borrower.

          7.8  Information and Inspection.  The Borrower shall furnish to the
               --------------------------                                    
Banks from time to time, upon request, full information pertaining to any
covenant, provision or condition hereof, or to any matter connected with its
books, records, operations, financial condition, properties, activities or
business.  The Borrower shall upon request supply the Banks with copies of all
correspondence, documents, reports or information filed with or received from
any Licensing Authority relating to the Borrower, any Tower or any License.  At
all reasonable times, the Borrower shall permit any authorized representatives
designated by any Bank to visit and inspect any of the properties of the
Borrower and its books and records, and to take extracts therefrom and make
copies thereof, and to discuss the Borrower's affairs, finances and accounts
with the management and independent accountants of the Borrower.

          7.9  Maintenance of Liens.  The Borrower shall do all things necessary
               --------------------                                             
to preserve and perfect the Liens of the Agent, for the benefit of the Banks,
arising pursuant hereto and pursuant to the Collateral Documents as first
priority Liens, except for Permitted Liens, and to insure that the Agent, for
the benefit of the Banks, has a Lien on substantially all of the assets of the
Borrower, including, without limitation, all assets acquired pursuant to the
Purchase Agreement.  If the Borrower purchases any real property or enters into
any material lease for real property, the Borrower shall (a) notify the Agent
and execute, deliver and cause to be recorded any Mortgage requested by the
Agent in connection therewith, which shall be a first lien, except for Permitted
Liens and (b) obtain from each lessor under such lease, in respect of which
lease the Borrower has granted to the Agent, for the benefit of the Banks, a
Mortgage, written consent to such grant in form and substance satisfactory to
the Agent.  If the Borrower enters into any other new material contract which
prohibits the assignment thereof or the granting of a security interest therein
without the consent of the other party, the Borrower shall obtain the written
consent of such other party to the grant to the Agent, for the benefit of the
Banks, of a security interest therein pursuant to the Security Agreement.

                                      -58-
<PAGE>
 
          7.10  Title To Property.  The Borrower shall own and hold title to all
                -----------------                                               
of its assets in its own name and not in the name of any nominee.

          7.11  Environmental Compliance and Indemnity.
                -------------------------------------- 

                (a)  The Borrower shall comply in all material respects with any
and all Environmental Laws, including, without limitation, all Environmental
Laws in jurisdictions in which the Borrower owns, maintains, operates or manages
a Tower, facility or site, arranges for disposal or treatment of Hazardous
Materials, solid waste or other wastes, accepts for transport any Hazardous
Materials, solid wastes or other wastes or holds any interest in real property
or otherwise. The Borrower shall not cause or allow the Release of Hazardous
Materials, solid waste or other wastes on, under or to any real property in
which the Borrower holds any interest or performs any of its operations, in
material violation of any Environmental Law. The Borrower shall promptly notify
the Agent and the Banks (i) of any material Release of a Hazardous Material on,
under or from the real property in which the Borrower holds or has held an
interest, upon the Borrower's learning thereof by receipt of notice that the
Borrower is or may be liable to any Person as a result of such Release or that
the Borrower has been identified as potentially responsible for, or is subject
to investigation by any governmental authority relating to, such Release, and
(ii) of the commencement or threat of any judicial or administrative proceeding
alleging a violation of any Environmental Laws.

                (b)  The Borrower shall defend, indemnify and hold the Agent and
the Banks, and their respective officers, directors, stockholders, employees,
agents, affiliates, successors and assigns harmless from and against all costs
(including clean up costs), expenses, fines, claims, demands, damages, penalties
and liabilities of every kind or nature whatsoever (including reasonable
attorneys', consultants' and experts' fees) arising out of, resulting from or
relating to, directly or indirectly, (i) the noncompliance of the Borrower or
any property owned or leased by the Borrower with any Environmental Law, or (ii)
any investigatory or remedial action involving the Borrower or any property
owned or leased by the Borrower and required by Environmental Laws or by order
of any governmental authority having jurisdiction under any Environmental Laws,
or (iii) any injury to any Person whatsoever or damage to any property arising
out of, in connection with or in any way relating to the breach of any of the
environmental warranties or covenants contained in this Agreement or any facts
or circumstances that cause any of the environmental representations or
warranties contained in this Agreement to cease to be true, or (iv) the Release
of any Hazardous Material on or affecting any property owned or leased by the
Borrower, or (v) the presence of any asbestos-containing material or 

                                      -59-
<PAGE>
 
underground storage tanks, whether in use or closed, under or on any property
owned or leased by the Borrower.

          7.12  Appraisals.  If at any time any Bank determines that it must 
                ---------- 
have current appraisals of any of the real property subject to a Mortgage to
comply with any law, rule or regulation applicable to it, then, upon request by
such Bank, the Borrower shall, at its expense, order appraisals of such real
property. Such appraisals shall be in form and substance acceptable to the
Banks, shall be prepared by appraisers acceptable to the Banks and shall be
delivered to the Agent within forty-five days of the request therefor.

          7.13  Rate Hedging Obligations.  The Borrower shall maintain, as of 
                ------------------------     
the end of each calendar quarter ending prior to July 1, 2001, and on the date
of closing of each Qualified Acquisition having a Purchase Price of $1,000,000
or more, in full force and effect agreements in form and substance reasonably
satisfactory to the Agent regarding Rate Hedging Obligations so that the
notional amount subject to such agreements equals at least 67% of the principal
amount of the Loans then outstanding for an average maturity of three years or,
if less, the period remaining prior to the Termination Date.

          7.14  Depository Accounts and Cash Management System. Within thirty
                ----------------------------------------------               
days after the Closing, the Borrower shall establish, and at all times
thereafter maintain, a deposit account with the Agent for the payment of
expenses in the ordinary course of business, and within one year after the
Closing, the Borrower shall establish, and at all times thereafter maintain, a
lockbox arrangement and such other cash management systems as the Agent shall
reasonably request.  The Borrower shall, promptly after the establishment of
such deposit account, instruct all licensees of space on its Towers to make all
payments due to the Borrower to such deposit account.

          7.15  Liens Securing Stockholder Debt.  At the request of the Agent,
                -------------------------------                               
which shall not be made more frequently than once in any twelve month period,
the Borrower shall provide, or cause to be provided, to the Agent a certificate
in form and substance reasonably satisfactory to the Agent calculating the
amount of Stockholder Debt that must be secured in order for the Borrower not to
be deemed to be a "United States Real Property Holding Corporation" for purposes
of Section 897 of the Code.  At such time as the affected Stockholder determines
that the Stockholder Debt is no longer required to prevent the Borrower from
being deemed to be a "United States Real Property Holding Corporation" for
purposes of Section 897 of the Code, all Liens securing the Stockholder Debt
shall be released.

                                      -60-
<PAGE>
 
SECTION 8.    NEGATIVE COVENANTS OF THE BORROWER.
              ---------------------------------- 

          So long as this Agreement remains in effect or any of the Obligations
remains unpaid or to be performed, or any Letter of Credit remains outstanding,
the Borrower shall not, directly or indirectly, take any of the actions set out
in this Section 8 nor permit any of the conditions set out herein to occur.

          8.1  Indebtedness.  The Borrower shall not incur, create, assume or
               ------------                                                  
permit to exist any Indebtedness, except:

               (a)  the Obligations;

               (b)  Indebtedness permitted under Section 8.4, 8.5 or 8.6;

               (c)  existing Indebtedness set forth on Exhibit H;
                                                       --------- 

               (d)  (i) Indebtedness to the Sellers in a principal amount not to
exceed $1,050,957, so long as such Indebtedness is unsecured and is subject to
the Sellers Subordination Agreement, (ii) secured Indebtedness to the Sellers in
a principal amount not to exceed $1,000,000, so long as such Indebtedness (A) is
non-recourse to the Borrower, (B) is secured only by the Borrower's interest in
accounts and contract rights attributable to Sites (as that term is defined in
the Purchase Agreement) not conveyed to the Borrower, (C) is for a term of no
more than ninety days from the Closing Date, and (D) is subject to the Sellers
Subordination Agreement, (iii) Stockholder Debt to Centennial Fund IV, L.P. in a
principal amount not to exceed $3,125,264, so long as such Indebtedness is
subject to the Stockholder Subordination Agreement, and (iv) Seller Debt in an
amount not to exceed $5,000,000;

               (e)  unsecured trade accounts payable and other unsecured current
Indebtedness incurred in the ordinary course of business and not more than one
hundred twenty days past due (but excluding any Indebtedness for borrowed
money);

               (f)  Indebtedness for taxes, assessments, governmental charges,
liens or similar claims to the extent that payment thereof shall not be required
to be made by the provisions of Section 7.4; and

               (g)  Indebtedness arising under Rate Hedging Obligations required
pursuant to Section 6.15 and 7.13.

          8.2  Liens.  The Borrower shall not incur, create, assume or permit to
               -----                                                            
exist any Lien of any nature whatsoever, including those arising in connection
with conditional sales or other title retention agreements, on any property or
assets now owned or hereafter acquired by the Borrower, other than (a) 

                                      -61-
<PAGE>
 
Permitted Liens, (b) Liens securing Stockholder Debt held by Centennial Fund IV,
L.P. to the extent required to prevent the Borrower from being deemed to be a
"United States Real Property Holding Corporation" for purposes of Section 897 of
the Code and (c) Liens in favor of the Sellers in the Borrower's interest in
accounts and contract rights attributable to Sites (as that term is defined in
the Purchase Agreement) not conveyed to the Borrower securing the Indebtedness
of the Borrower permitted pursuant to Section 8.1(d)(ii).

          8.3  Guaranties.  The Borrower shall not become a Guarantor for any
               ----------                                                    
Person, except with respect to endorsements of negotiable instruments for
collection in the ordinary course of business.

          8.4  Rental and Conditional Sale Obligations.  The Borrower shall not
               ---------------------------------------                         
incur, create, assume or permit to exist, with respect to any personal property,
any conditional sale obligation, any purchase money obligation, any rental
obligation, any purchase money security interest or any other arrangement for
the use of personal property of any other Person, other than an arrangement
classifiable as a capital lease which is permitted in Section 8.6, if the
aggregate amount payable by the Borrower pursuant to such arrangements (other
than any such arrangements incurred in connection with a Qualified Acquisition)
would exceed $50,000 in any fiscal year.

          8.5  Real Property Interests.  Notwithstanding any contrary provisions
               -----------------------                                          
of Section 7.9, the Borrower shall not enter into, assume or permit to exist any
lease or rental obligation for real property, including, without limitation,
towers and related facilities, if the aggregate amount payable in respect
thereof by the Borrower (other than any such arrangements incurred in connection
with a Qualified Acquisition) would exceed $50,000 in any fiscal year.  Except
as permitted in Section 8.10(b), the Borrower shall not purchase or lease any
real property.

          8.6  Capital Leases.  The Borrower shall not incur, create, assume or
               --------------                                                  
permit to exist any Capitalized Lease Obligations under any lease of personal or
real property if the aggregate amount payable in respect of all such Capitalized
Lease Obligations (other than Capitalized Lease Obligations incurred in
connection with a Qualified Acquisition) would exceed $50,000 in any fiscal
year.

          8.7  Capital Expenditures.  Except for Qualified Acquisitions
               --------------------                                    
permitted pursuant to Section 10(b), the Borrower shall not make Capital
Expenditures (not including (x) any payments in respect of Capitalized Lease
Obligations or (y) expenditures of proceeds of casualty insurance policies
reasonably and promptly applied to replace insured assets) which 

                                      -62-
<PAGE>
 
exceed the sum of (a) (i) $175,000 in the aggregate in either of fiscal years
1995 or 1996, and (ii) $75,000 in the aggregate in any fiscal year thereafter,
plus (b) an amount equal to 10% of operating cash flow, for the twelve month
period most recently ended prior to such acquisition, of Towers acquired in each
Qualified Acquisition. In addition to the Capital Expenditures permitted
pursuant to the foregoing sentence, the Borrower may make Capital Expenditures
in fiscal years 1995 and 1996 in an amount not to exceed $1,000,000 per year for
the purpose of constructing new Towers.

          8.8  Notes, Accounts Receivable and Claims.  The Borrower shall not
               -------------------------------------                         
(a) sell, discount or otherwise dispose of any note, account receivable or other
right to receive payment, with or without recourse, except for collection in the
ordinary course of business; or (b) fail to timely assert any claim, cause of
action or contract right which it possesses against any third party nor agree to
settle or compromise any such claim, cause of action or contract right except in
any case in the exercise of good business judgment and except for settlements or
compromises made in the reasonable exercise of business judgment in the ordinary
course of business.

          8.9  Capital Distributions.  The Borrower shall not make, or declare
               ---------------------                                          
or incur any liability to make, any Capital Distribution.

           8.10  Disposal of Property; Mergers; Acquisitions; Reorganizations.
                 ------------------------------------------------------------ 

                 (a)  Except as expressly permitted pursuant to Section 8.10(b),
the Borrower shall not (i) dissolve or liquidate; (ii) sell, lease, transfer or
otherwise dispose of any material portion of its properties or assets to any
Person; (iii) be a party to any consolidation, merger, recapitalization or other
form of reorganization; (iv) make any acquisition of all or substantially all
the assets of any Person, or of a business division or line of business of any
Person, or of any other assets constituting a going business; (v) create,
acquire or hold any Subsidiary; or (vi) be or become a party to any joint
venture or other partnership.

                 (b)  The Borrower may make the acquisitions contemplated by the
Purchase Agreement and other Division A Acquisitions and Division B
Acquisitions, subject to the satisfaction of the following conditions (any such
acquisition, or series of related acquisitions, which satisfies such conditions
being referred to hereinafter as a "Qualified Acquisition"):

                      (i)  the Borrower shall have given to the Agent written
notice of such acquisition at least thirty days 

                                      -63-
<PAGE>
 
prior to executing any binding commitment with respect thereto and shall have
delivered to the Agent a properly completed Acquisition Advance Worksheet no
later than ten Banking Days prior to the closing of such acquisition, in
accordance with the provisions of Section 2.4(d)(iii);

          (ii)  the Borrower shall have demonstrated to the satisfaction of the
Agent that the Borrower will be in compliance with all of the covenants
contained herein after giving effect to such acquisition and that no Event of
Default or Possible Default then exists or would exist after giving effect to
such acquisition;

          (iii) the Borrower shall have delivered to the Agent within twenty
days prior to the consummation of such acquisition an acquisition report signed
by the chief financial officer of the Borrower in form and substance
satisfactory to the Agent which shall contain calculations demonstrating on a
pro forma basis the Borrower's compliance with the financial covenants set forth
in this Section 8 after giving effect to the Qualified Acquisition and, if the
borrowing hereunder in connection with such acquisition is in an amount in
excess of $500,000, projections for the Borrower for a five year period after
the closing of the Qualified Acquisition giving effect to the Qualified
Acquisition and including a statement of sources and uses of funds for such
acquisition showing, among other things, the source of financing for such
acquisition;

           (iv) after giving effect to such acquisition, the Borrower shall have
(A) marketable fee simple title or an assignable and insurable leasehold
interest in each property on which an acquired Tower is located and (B) either
(I) written agreements for licensing of space on such Tower with at least 75% of
the licensees of space on such Tower existing immediately prior to such
acquisition or (II) in its good faith judgment, a strong probability of
retaining 90% of the licensees of space on such Tower existing immediately prior
to such acquisition, in each case, with respect to such license agreements, on
substantially the same terms and conditions as existed immediately prior to such
acquisition;

           (v)  the Agent shall have received from the Borrower an engineering
report from an engineer, satisfactory to the Agent, acceptable in form and
substance to the Agent, with respect to the construction, engineering and
maintenance of the Towers to be acquired or managed and their compliance with
applicable laws, rules and regulations; provided, however, that delivery of an
                                        --------  -------                     
engineering report in form and substance substantially similar to the
engineering reports prepared in connection with the Purchase Agreement shall be
deemed to have satisfied this subsection (v);

                                      -64-
<PAGE>
 
          (vi)  the agreement governing such acquisition and all related
documents and instruments shall be satisfactory to the Agent in form and
substance and no Event of Default or Possible Default shall exist immediately
prior to, or after giving effect to the consummation of, such acquisition;

          (vii)  the Purchase Price of such acquisition shall be payable in cash
at the closing of such acquisition or by the delivery of the Borrower's note, so
long as such note satisfies the following conditions (the aggregate Indebtedness
evidenced by all such notes being referred to herein collectively as "Seller
Debt"):

                (A)  such note shall be secured by a Letter of Credit issued
pursuant hereto (subject to the satisfaction of the conditions to such issuance
set forth herein) in the amount of such note but shall not be secured by any
Lien on any property of the Borrower;

                (B)  such note shall bear interest at a fixed rate which shall
not exceed the lower of the rate of interest on United States Treasury
obligations having a term of one year or 7% per annum;

                (C)  the term of such note shall not extend beyond December 31,
2001;

                (D)  the sum of the principal amount of such note and the
principal amount of all other notes issued by the Borrower in connection with
Qualified Acquisitions shall not exceed $5,000,000; and

                (E)  no more than five notes issued by the Borrower pursuant to
Qualified Acquisitions shall be outstanding at any one time.

          (viii)  the Borrower shall have taken any actions as may be necessary
or reasonably requested by the Agent to grant to the Agent, for the benefit of
the Banks, first priority, perfected Liens in all assets, real and personal,
tangible and intangible, acquired by the Borrower in such Qualified Acquisition
pursuant to the Collateral Documents, subject to no prior Liens except Permitted
Liens; and if the Borrower acquires a Subsidiary or creates a Subsidiary
pursuant to or in connection with such acquisition,

                (A)  the Borrower shall execute a Pledge Agreement, in form and
substance satisfactory to the Agent, pursuant to which all of the stock or other
securities or equity interests of such acquired or created Subsidiary are
pledged to the Agent, for the benefit of the Banks, as security for the
Obligations of the Borrower hereunder and under the Notes;

                                      -65-
<PAGE>
 
                (B)  such acquired or created Subsidiary shall execute and
deliver to the Agent, for the benefit of the Banks, a Guaranty, in form and
substance satisfactory to the Agent, and shall grant to the Agent, for the
benefit of the Banks, a first priority, perfected lien or security interest in
all of its assets, real and personal, tangible and intangible, subject to no
prior liens or security interests except for Permitted Liens, pursuant to a
Security Agreement and Mortgages, in form and substance satisfactory to the
Agent, and shall take all actions required pursuant thereto; and

                (C)  the Borrower shall have entered into an amendment to this
Agreement, in form and substance reasonably satisfactory to the Agent, which
shall make the covenants, defaults and other provisions of this Agreement
applicable to such Subsidiary;

          (ix)  the Borrower shall have delivered to the Agent evidence
reasonably satisfactory to the Agent to the effect that all approvals, consents
or authorizations required in connection with such acquisition from any
Licensing Authority or other governmental authority shall have been obtained,
and such opinions as the Agent may reasonably request as to the liens and
security interests granted to the Agent, for the benefit of the Banks, as
required pursuant to this Section, and as to any required regulatory approvals
for such acquisition;

          (x)   the Agent shall have received copies of all documents relating
to the Qualified Acquisition, and the Borrower shall have caused all opinions
and certificates of the seller of such Towers delivered in connection with such
closing to be addressed to the Banks;

          (xi)  if such acquisition involves an aggregate Purchase Price of at
least $2,000,000, then the Agent shall have received a statement from KPMG Peat
Marwick (or another nationally recognized firm of independent certified public
accountants selected by the Borrower and acceptable to the Agent) certifying as
to the operating cash flow of the acquired Towers or, in the case of a
management agreement, such management agreement, for the twelve month period
most recently ended prior to the closing of such acquisition and as to such
other matters as the Agent may reasonably request;

          (xii)  if such acquisition involves an aggregate Purchase Price in
excess of $6,000,000, then the Agent in its sole discretion shall have approved
such acquisition; and

          (xiii)  the closing of such acquisition shall occur no later than June
30, 1997.

                                      -66-
<PAGE>
 
          8.11  Investments.  The Borrower shall not purchase or otherwise
                -----------                                               
acquire, hold or invest in any stock or other securities or evidences of
indebtedness of, or any interest or investment in, or make or permit to exist
any loans or advances to, any other Person, except:

                (a)  direct obligations of the United States Government maturing
within one year;

                (b)  certificates of deposit of a member bank of the Federal
Reserve System having capital, surplus and undivided profits in excess of
$100,000,000; and

                (c)  any investment in commercial paper which at the time of
such investment is assigned the highest quality rating in accordance with the
rating systems employed by either Moody's Investors Service, Inc. or Standard &
Poor's Corporation.

          8.12  Amendment of Governing Documents.  The Borrower shall not, and
                --------------------------------                              
shall not permit any other Person to, amend, modify or supplement its
Certificate of Incorporation, its By-Laws, the Stockholders Agreement or any
other organizational or governing document of the Borrower, unless required by
law.

          8.13  Financial Covenants.
                ------------------- 

                (a)  Leverage Ratio.  The Borrower shall not permit the 
                     --------------      
Leverage Ratio as of any date in any period listed in Column A below to be
greater than the ratio set forth in Column B below opposite such period:
<TABLE>
<CAPTION>
 
Column A                                  Column B
- --------                                  --------
                            
Period:                               Permitted Ratio:
- ------                                ---------------
<S>                                   <C>
Closing to June 29, 1997:                 5.50:1.0
June 30, 1997, to December 30,            5.25:1.0
1997:

December 31, 1997, to June 29,            4.50:1.0
1998:

June 30, 1998, to December 30,            4.25:1.0
1998:

December 31, 1998, to December            3.50:1.0
30, 1999:

December 31, 1999, and                    3.00:1.0;
thereafter:
</TABLE>

                                      -67-
<PAGE>
 
provided, however, that if the Borrower uses any proceeds of a Reducing Loan to
- --------  -------                                                              
make any prepayment of the Term Loans pursuant to Section 8.4(d)(i), then the
ratio set forth in Column B above for all periods ending prior to December 30,
1997, shall be reduced to 5.0:1.0.

               (b)  Fixed Charge Coverage Ratio.  The Borrower shall not permit
                    ---------------------------  
 the Fixed Charge Coverage Ratio as of any date to be less than 1.05:1.0.

               (c)  Projected Debt Service Coverage Ratio.  The Borrower shall 
                    -------------------------------------   
not permit the ratio of the excess of (i) Annualized Operating Cash Flow as of
the end of any quarter over (ii) federal and state income taxes (to the extent
added back to Net Earnings in calculating Operating Cash Flow) for the four
quarter period then ended, to Projected Debt Service as of the end of such
quarter to be less than 1.10:1.00.

               (d)  Minimum Annualized Operating Cash Flow.  The Borrower shall
                    --------------------------------------  
not permit Annualized Operating Cash Flow as of the end of any quarter ending in
any period listed in Column A below to be less than or equal to the amount set
forth in Column B below opposite such period:
<TABLE>
<CAPTION>
 
Column A                           Column B
- --------                           -------- 
 
Period:                            Amount:
- ------                             ------     
<S>                               <C>
Closing to December 30, 1996:     $2,000,000

December 31, 1996, to December    $2,300,000
30, 1997:

December 31, 1997, to December    $2,850,000
30, 1998:

December 31, 1998, and            $3,000,000
thereafter:
</TABLE>

               (e)  Minimum Cash Reserve.  The Borrower shall not permit the 
                    --------------------       
sum of the aggregate amount of its cash and cash equivalents permitted pursuant
to Section 8.11 plus the undrawn amount of the Working Capital Commitment to be
less than or equal to, at any time, $300,000.

         8.14  Management Agreements and Fees.  Except for the Management
               ------------------------------                            
Agreement, the Borrower shall not make or enter into, nor pay any management
fees pursuant to, any so-called management or service agreement whereby
management, supervision or control of its business, or any significant aspect
thereof, shall be delegated to or placed in any Person other than an employee of
the Borrower.  Except to the extent approved by the Banks, the Borrower shall
not pay management fees or other compensation to the Sellers pursuant to the
Management Agreement in an amount in any year which exceeds 15% of the
Borrower's tower revenues. 

                                      -68-
<PAGE>
 
Upon the termination of the Management Agreement, the Borrower shall not enter
into a replacement management agreement unless the terms and conditions of such
agreement and the manager thereunder are reasonably acceptable to the Agent. Any
such replacement management agreement approved by the Agent shall be deemed to
be the Management Agreement for all purposes hereof.

         8.15  Fiscal Year.  The Borrower shall not change its fiscal year,
               -----------                                                 
which shall be the calendar year.

         8.16  ERISA.  Neither the Borrower nor any member of the Controlled
               -----                                                        
Group shall fail to make any contributions which are required pursuant to the
terms of any Plan or any Benefit Arrangement.  Neither the Borrower nor any
member of the Controlled Group shall contribute to or agree to contribute to any
Plan which is (a) subject to the minimum funding requirements under ERISA
Section 302 or Code Section 412; (b) a multiemployer plan (as defined in ERISA
Section 4001(a)(3)); (c) a defined benefit plan (as defined under ERISA Section
3(35) or Code Section 414(j)); (d) a multiple employer plan (as defined in ERISA
Section 4063); or (e) a multiple employer welfare arrangement (as defined in
ERISA Section 3(40)).

         8.17  Affiliates.  The Borrower shall not enter into any transaction or
               ----------                                                       
agreement with any Stockholder or other Affiliate of the Borrower or of a
Stockholder unless the terms of such transaction or agreement are no less
favorable to the Borrower than could be obtained in an arms-length transaction.

         8.18  Change of Name or Corporate Structure.  The Borrower shall not
               -------------------------------------                         
change its name or corporate structure without thirty days prior written notice
to the Agent.

         8.19  Amendments or Waivers.  The Borrower shall not amend, alter or
               ---------------------                                         
modify, or consent to or suffer any amendment, alteration or modification, (a)
of the Securities Purchase Agreement, the Purchase Agreement, the License
Agreement or the Management Agreement, or (b) of any License, Land Lease
Agreement or other material contract (or waive a material right thereunder)
except, in the case of the agreements listed in this clause (b) for any
amendments, alterations or modifications which could not reasonably be expected
to have a Material Adverse Effect.

         8.20  Issuance or Transfer of Capital Stock.  The Borrower shall not
               -------------------------------------                         
sell or issue any capital stock or other equity interests or any warrants,
options or other securities convertible into or exercisable for any capital
stock or other equity interests, and the Borrower shall not permit the transfer
of any capital stock.

          8.21  Change in Business.  The Borrower shall not change the nature of
                ------------------                                              
its business in any material respect.

          8.22  Payments to Stockholders and Affiliates.  The Borrower shall not
                ---------------------------------------                         
pay any compensation or salary to any 

                                      -69-
<PAGE>
 
Stockholder or any other Person who owns any right to acquire capital stock of
Holdco or the Borrower by warrant, option or otherwise, or to any Affiliate of
any such owner unless such owner or Affiliate performs services required by the
Borrower for the normal conduct of its business and the compensation paid to
such Person is not materially in excess of the fair value of the services
rendered to the Borrower.

          8.23  Regulation U.  The Borrower shall not, directly or indirectly,
                ------------                                                  
(a) apply any part of the proceeds of the Loans to the purchasing or carrying of
any "margin stock" within the meaning of Regulations G, T, U or X of the Federal
Reserve Board, or any regulations, interpretations or rulings thereunder, (b)
extend credit to others for the purpose of purchasing or carrying any such
margin stock, or (c) retire Indebtedness which was incurred to purchase or carry
any such margin stock.

          8.24  Subordinated Debt.  The Borrower shall not make, or cause or
                -----------------                                           
permit to be made, any payments in respect of any Indebtedness which is
subordinated to the Obligations in contravention of the subordination provisions
contained in the evidence of such subordinated Indebtedness or in contravention
of the Sellers Subordination Agreement or the Stockholder Subordination
Agreement or any other subordination agreement or other written agreement
pertaining to Subordinated Debt.

          8.25  Rights of First Refusal and Call Rights.  The Company shall not
                ---------------------------------------                        
exercise any right of first refusal, call right or other right to acquire any of
its outstanding capital stock or other equity interests from any Person, unless
the entire amount paid by the Borrower to such Person (or his estate) in respect
of such exercise is funded entirely from the proceeds of key man life insurance
maintained by the Borrower on the life of such Person.


 SECTION 9.     EVENTS OF DEFAULT.
                ----------------- 

          The occurrence of any one or more of the following events, whether
voluntarily or involuntarily or by operation of law, shall constitute an Event
of Default hereunder:

           9.1  Non-Payment.  The Borrower shall (a) fail to pay when due,
                -----------                                               
whether by acceleration of maturity or otherwise, any installment of principal
under any Note or (b) fail to pay when due, whether by acceleration of maturity
or otherwise, or within two days thereafter, any installment of interest or any
fee or other payment obligation in respect of the Obligations.

           9.2  Failure of Performance in Respect of Other Obligations.  (a) The
                ------------------------------------------------------          
Borrower shall fail to observe, perform or be in compliance with any of the
provisions of Section 8, Sections 7.1 or 7.3 or the first sentence of Section
7.2; or (b) the Borrower or any other party to a Collateral Document (other than
the Agent or a Bank) shall fail to observe, perform or be in 

                                      -70-
<PAGE>
 
compliance with the terms of any Obligation, covenant or agreement, other than
those referred to in Section 9.1, Section 8, Sections 7.1 or 7.3 or the first
sentence of Section 7.2, to be observed, performed or complied with by the
Borrower or such other party hereunder or under any Collateral Document and, 
provided that such failure is of a type which can be cured, such failure shall
- --------                  
continue and not be cured for thirty days after: (i) notice thereof from the
Agent or a Bank or (ii) the Banks are notified thereof or should have been
notified thereof pursuant to the provisions of Section 7.6, whichever is
earlier; or (c) any party to any Pledge Agreement shall, or shall attempt to,
voluntarily or involuntarily, encumber, subject to any further pledge or
security interest, sell, transfer or otherwise dispose of any of the Pledged
Collateral (as that term is defined in any Pledge Agreement) or any interest
therein except as expressly provided herein or therein.

          9.3  Breach of Warranty.  Any financial statement, representation,
               ------------------                                           
warranty, statement or certificate made or furnished by the Borrower or any
other party to a Collateral Document (other than the Agent or a Bank) to the
Agent or the Banks in or in connection with this Agreement or any Collateral
Document, or as an inducement to the Agent or the Banks to enter into this
Agreement, including, without limitation, those in Section 5 above or in any
Collateral Document, shall have been false, incorrect or incomplete when made or
deemed made in any material respect;

          9.4  Cross-Defaults.  The Borrower shall default in any payment due on
               --------------                                                   
any Indebtedness in excess of $50,000 and such default shall continue for more
than the period of grace, if any, applicable thereto; or the Borrower shall
default in the performance of or compliance with any term of any evidence of
such Indebtedness or of any mortgage, indenture or other agreement relating
thereto, and any such default shall continue for more than the period of grace,
if any, specified therein and shall not have been waived pursuant thereto if
such default causes, or permits the holder thereof to cause, the acceleration of
such Indebtedness; or the Borrower shall default in the performance of any
material covenant or agreement set forth in the Securities Purchase Agreement or
the Securities Exchange Agreement among the Borrower, Holdco and the
Stockholders or shall breach in any material respect any representation or
warranty therein.

          9.5  Assignment for Benefit of Creditors.  The Borrower shall make an
               -----------------------------------                             
assignment for the benefit of its creditors, or shall admit its insolvency or
shall fail to pay its debts generally as such debts become due.

          9.6  Bankruptcy.  Any petition seeking relief under Title 11 of the
               ----------                                                    
United States Code, as now constituted or hereafter amended, shall be filed by
or against the Borrower or any proceeding shall be commenced by or against the
Borrower with respect to relief under the provisions of any other applicable

                                      -71-
<PAGE>
 
bankruptcy, insolvency or other similar law of the United States or any State
providing for the reorganization, winding-up or liquidation of Persons or an
arrangement, composition, extension or adjustment with creditors; provided,
                                                                  -------- 
however, that no Event of Default shall be deemed to have occurred if any such
- -------                                                                       
involuntary petition or proceeding shall be discharged within sixty days of its
filing or commencement.

          9.7  Appointment of Receiver; Liquidation.  A receiver or trustee
               ------------------------------------                        
shall be appointed for the Borrower or for any substantial part of its assets,
and such receiver or trustee shall not be discharged within sixty days of his
appointment; any proceedings shall be instituted for the dissolution or the full
or partial liquidation of the Borrower, and such proceedings shall not be
dismissed or discharged within sixty days of their commencement; or the Borrower
shall discontinue its business.

          9.8  Judgments.  The Borrower shall incur a final judgment for the
               ---------                                                    
payment of money in an amount which, together with all other final judgments
against the Borrower, exceeds $50,000, and shall not discharge (or make adequate
provision for the discharge of) the same within a period of thirty days unless,
pending further proceedings, execution thereon has been effectively stayed.

          9.9  Impairment of Collateral; Invalidation of any Loan Document.  (a)
               -----------------------------------------------------------      
A creditor of the Borrower or any other party to a Collateral Document shall
obtain possession of any of the collateral for the Obligations by any means,
including, without limitation, attachment, levy, distraint, replevin or self-
help, or any creditor shall establish or obtain any right in such collateral; or
(b) the Agent shall cease to have a perfected, first priority Lien on all of the
issued and outstanding capital stock of the Borrower; or (c) any Lien created or
purported to be created by this Agreement or any Collateral Document shall cease
or fail to be perfected with respect to any of the collateral purported to be
covered thereby; or (d) any material portion of such collateral shall be lost,
stolen, damaged or destroyed for which there is either no insurance coverage or
in, in the reasonable opinion of the Agent, there is insufficient insurance
coverage; or (e) this Agreement, any Note or any Collateral Document ceases to
be a legal, valid, binding agreement or obligation enforceable against any party
thereto (including the Agent and the Banks) in accordance with its terms, or
shall be terminated, invalidated, set aside or declared ineffective or
inoperative.

          9.10  Termination of License or Agreements.  The FAA or any other
                ------------------------------------                       
Licensing Authority shall revoke, terminate, substantially and adversely modify
or fail to renew any material License of the Borrower or commence proceedings to
suspend, revoke, terminate or substantially and adversely modify any such
License and such proceedings shall not be dismissed or discharged within sixty
days; or any License Agreements or Land Lease Agreements or other agreements
which are necessary to the 

                                      -72-
<PAGE>
 
operation of the business of the Borrower shall be revoked, terminated or
adversely modified and not replaced by substitutes acceptable to the Agent
within thirty days of such revocation, termination or modification and without
which agreements a Material Adverse Effect could reasonably be expected.

          9.11  Change of Control.  Holdco shall cease to own all of the issued
                -----------------                                              
and outstanding capital stock of the Borrower; or Edward C. Hutcheson, Jr. and
Ted B. Miller, Jr. shall cease to own in the aggregate 10% of the capital stock
of Holdco, or the persons who are Stockholders of Holdco as of the date of this
Agreement shall cease to own in the aggregate 60% of the capital stock of
Holdco.

          9.12  Default under Collateral Document.  The Borrower or any other
                ---------------------------------                            
party (other than the Agent and the Banks) shall default under any Collateral
Document after any required notice and such default shall continue beyond any
applicable grace period.

          9.13  Condemnation.  Any court, government or governmental agency 
                ------------   
shall condemn, seize, or otherwise appropriate, or take custody or control of
any substantial portion of the assets of the Borrower.

          9.14  Put, Call and Redemption Rights.  The Borrower shall exercise 
                -------------------------------     
any call right or right of first refusal in respect of any of its capital stock,
or any Person shall exercise any put right in respect of any of the capital
stock of the Borrower, unless the entire amount paid by the Borrower to such
Person (or his estate) in respect of such exercise of a put or call right is
funded entirely from the proceeds of key man life insurance maintained by the
Borrower on the life of such Person, or Holdco or any other stockholder of the
Borrower shall exercise any redemption right pursuant to the Certificate of
Incorporation of the Borrower.

           9.15  Material Adverse Change.  Any Material Adverse Effect shall
                 -----------------------                                    
occur.


 SECTION 10.   REMEDIES.
               -------- 

          Notwithstanding any contrary provision or inference herein or
elsewhere,

           10.1  Optional Defaults.
                 ----------------- 

           If any Event of Default referred to in Sections 9.1-9.4 or 9.8-9.15
shall occur, the Agent, with the consent of the Majority Banks, upon written
notice to the Borrower, may

                 (a)  terminate the Commitments and the credit hereby
established and forthwith upon such election the obligations of the Banks to
make any further Loans (other than 

                                      -73-
<PAGE>
 
Loans resulting from the funding of Letters of Credit) or issue any Letters of
Credit hereunder immediately shall be terminated, and/or

                 (b)  accelerate the maturity of the Loans and all other
Obligations (including Rate Hedging Obligations subject to the terms and
conditions of the agreements governing such Rate Hedging Obligations), whereupon
all Obligations shall become and thereafter be immediately due and payable in
full without any notice of intent to accelerate or notice of acceleration and
without any presentment or demand and without any further or other notice of any
kind, all of which are hereby waived by the Borrower, and/or

                 (c)  demand the payment to the Banks of the aggregate principal
amounts of the Letter of Credit Notes, which amounts the Banks shall hold as
security for the obligations incurred under the Letters of Credit, this
Agreement or the Notes.

          10.2  Automatic Defaults.  If any Event of Default referred to in
                ------------------                                         
Sections 9.5-9.7 shall occur,

                (a)  the Commitments and the credit hereby established shall
automatically and forthwith terminate, and the Banks thereafter shall be under
no obligation to grant any further Loans hereunder (other than Loans resulting
from the funding of Letters of Credit) or issue any Letters of Credit, and

                (b)  the principal of and interest on the Notes, then
outstanding, and all of the other Obligations shall thereupon become and
thereafter be immediately due and payable in full, all without any notice of
intent to accelerate or notice of acceleration and without any presentment,
demand or other notice of any kind, which are hereby waived by the Borrower, and

                (c)  the aggregate principal amounts of the Letter of Credit
Notes shall be immediately payable by the Borrower to the Banks.

          10.3  Performance by the Banks.  If at any time the Borrower fails or
                ------------------------                                       
refuses to pay or perform any obligation or duty to any third Person, except for
payments which are the subject of bona fide disputes in the ordinary course of
business, the Banks may, in their sole discretion, but shall not be obligated
to, pay or perform the same on behalf of the Borrower, and the Borrower shall
promptly repay all amounts so paid, and all costs and expenses so incurred.
This repayment obligation shall become one of the Obligations of the Borrower
hereunder and shall bear interest at the Default Interest Rate.

          10.4  Other Remedies.  Upon the occurrence of an Event of Default, the
                --------------                                                  
Agent and the Banks may exercise any other right, power or remedy as may be
provided herein, in any Note or in any other Collateral Document, or as may be
provided at law or in 

                                      -74-
<PAGE>
 
equity, including, without limitation, the right to recover judgment against the
Borrower for any amount due either before, during or after any proceedings for
the enforcement of any security or any realization upon any security.

          10.5  Enforcement and Waiver by the Banks.  The Agent and the Banks
                -----------------------------------                          
shall have the right at all times to enforce the provisions of this Agreement
and all Collateral Documents in strict accordance with the terms hereof and
thereof, notwithstanding any conduct or custom on the part of the Agent or the
Banks in refraining from so doing at any time, unless the Banks shall have
waived such enforcement in writing in respect of a particular instance.  The
failure of the Banks at any time to enforce their rights under such provisions
shall not be construed as having created a custom or course of dealing in any
way contrary to the specific provisions of this Agreement or the Collateral
Documents, or as having in any way modified or waived the same.  All rights,
powers and remedies of the Banks are cumulative and concurrent and the exercise
of one right, power or remedy shall not be deemed a waiver or release of any
other right, power or remedy.


 SECTION 11.    THE AGENT.
                --------- 

          11.1  Appointment.  Society National Bank is hereby appointed Agent
                -----------                                                  
hereunder, and each of the Banks irrevocably authorizes the Agent to act as the
agent of such Bank.  The Agent agrees to act as such upon the express conditions
contained in this Section 11.  The Agent shall not have a fiduciary relationship
in respect of any Bank by reason of this Agreement.

          11.2  Powers.  The Agent shall have and may exercise such powers
                ------                                                    
hereunder as are specifically delegated to it by the terms hereof, together with
such powers as are reasonably incidental thereto.  The Agent shall not have any
implied duties or any obligation to the Banks to take any action hereunder
except any action specifically provided by this Agreement to be taken by the
Agent.

          11.3  General Immunity.  Neither the Agent nor any of its directors,
                ----------------                                              
officers, affiliates, agents or employees shall be liable to the Banks or any
Bank for any action taken or omitted to be taken by it or them hereunder or in
connection herewith except for its or their own gross negligence or willful
misconduct.  Without limiting the foregoing, neither the Agent nor any of its
directors, officers, affiliates, agents or employees shall be responsible for,
or have any duty to examine (a) the genuineness, execution, validity,
effectiveness, enforceability, value or sufficiency of this Agreement, any
Collateral Document, or any other document or instrument furnished pursuant to
or in connection with this Agreement or any Collateral Document, (b) the
collectibility of any amounts owed by the Borrower, (c) any recitals,
statements, reports, representations or warranties made in connection with this

                                      -75-
<PAGE>
 
Agreement or any Collateral Document, (d) the performance or satisfaction by the
Borrower of any covenant or agreement contained herein or in any Collateral
Document, (e) any failure of any party to this Agreement to receive any
communication sent, including any telegram, teletype, bank wire, cable,
radiogram or telephone message sent or any writing, application, notice, report,
statement, certificate, resolution, request, order, consent letter or other
instrument or paper or communication entrusted to the mails or to a delivery
service, or (f) the assets or liabilities or financial condition or results of
operations or business or credit-worthiness of the Borrower.  The Agent shall
not be bound to ascertain or inquire as to the performance or observance of any
of the terms of this Agreement or any Collateral Document.

          11.4  Action on Instructions of the Banks.  The Agent shall not be
                -----------------------------------                         
required to exercise any discretion or take any action, but shall be required to
act or to refrain from acting (and shall be fully protected in so acting or
refraining from acting) upon the instructions of the Majority Banks (subject to
Section 11.12 hereof), and such instructions shall be binding upon all the Banks
and all holders of the Notes; provided, however, that the Agent shall not be
                              --------  -------                             
required to take any action which exposes it to personal liability or which is
contrary to this Agreement or applicable law.  The foregoing provisions of this
Section 11.4 shall not limit in any way the exercise by any Bank of any right or
remedy granted to such Bank pursuant to the terms of this Agreement or any
Collateral Document.  Except as otherwise expressly provided herein, any
reference in this Agreement to action by the Banks shall be deemed to be a
reference to the Majority Banks.

          11.5  Employment of Agents and Counsel.  The Agent may execute any of
                --------------------------------                               
its duties as Agent hereunder by or through employees, agents and attorneys-in-
fact and shall not be answerable to the Banks, except as to money or securities
received by it or its authorized agents, for the default or misconduct of any
such agents or attorneys-in-fact selected by it with reasonable care.

          11.6  Reliance on Documents; Counsel.  The Agent shall be entitled to
                ------------------------------                                 
rely upon any Note, notice, consent, certificate, affidavit, letter, telegram,
statement, paper or document believed by it to be genuine and correct and to
have been signed or sent by the proper person or persons, and, with respect to
legal matters, upon the opinion of counsel selected by the Agent, which counsel
may be employees of the Agent, concerning all matters pertaining to the agency
hereby created and its duties hereunder.

          11.7  Agent's Reimbursement and Indemnification.  The Banks agree to
                -----------------------------------------                     
reimburse and indemnify the Agent (which indemnification shall be shared by the
Banks ratably in proportion to their respective Ratable Shares) (a) for any
amounts not reimbursed by the Borrower for which the Agent is 

                                      -76-
<PAGE>
 
entitled to reimbursement by the Borrower hereunder or under any Collateral
Document, (b) for any other expenses reasonably incurred by the Agent on behalf
of the Banks, in connection with the preparation, execution, delivery,
administration, amendment or enforcement hereof or of any of the Collateral
Documents and (c) for any liabilities, obligations, losses, damages, penalties,
actions, judgments, suits, costs, expenses or disbursements of any kind and
nature whatsoever which may be imposed on, incurred by or asserted against the
Agent in any way relating to or arising out of this Agreement, any Collateral
Document or any other document related hereto or thereto or the transactions
contemplated hereby or the enforcement of any of the terms hereof or thereof or
of any such other documents, provided that no Bank shall be liable for any of
                             --------
the foregoing to the extent they arise from the gross negligence or willful
misconduct of the Agent.

          11.8  Rights as a Bank.  With respect to its Ratable Share of the
                ----------------                                           
Commitments, the Loans made by it, the Letters of Credit issued by it and the
Notes issued to it, the Agent shall have the same rights and powers hereunder as
any Bank and may exercise the same as though it were not the Agent, and the term
"Bank" or "Banks" shall, unless the context otherwise indicates, include the
Agent in its individual capacity.  The Agent may accept deposits from, lend
money to, and generally engage in any kind of banking or trust business with the
Borrower as if it were not the Agent hereunder.

          11.9  Bank Credit Decision.  Each Bank acknowledges that it has,
                --------------------                                      
independently and without reliance upon the Agent or any other Bank and based on
the financial statements prepared by the Borrower and such other documents and
information as it has deemed appropriate, made its own credit analysis and
decision to enter into this Agreement and the other Collateral Documents. Each
Bank also acknowledges that it will, independently and without reliance upon the
Agent or any other Bank and based on such documents and information as it shall
deem appropriate at the time, continue to make its own credit decisions in
taking or not taking action under this Agreement and the other Collateral
Documents.  The Agent shall not be required to keep the Banks informed as to the
performance or observance by the Borrower of this Agreement or any other
document referred to or provided for herein or to inspect the properties or
books of the Borrower. Except for notices, reports and other documents and
information expressly required to be furnished to the Banks by the Agent
hereunder, the Agent shall not have any duty or responsibility to provide any
Bank with any credit or other information concerning the affairs, financial
condition or business of the Borrower which may come into its possession.

          11.10 Successor Agent.  The Agent may resign at any time by giving
                ---------------                                             
written notice thereof to the Banks.  Upon any such resignation, the Majority
Banks shall have the right to appoint a successor Agent.  If no successor Agent
shall have been so appointed by the Majority Banks and shall have accepted such
appointment within thirty days after the notice of resignation, 

                                      -77-
<PAGE>
 
then the retiring Agent may appoint a successor Agent. Such successor Agent
shall be a commercial bank having capital and retained earnings of at least
$500,000,000. Upon the acceptance of any appointment as the Agent hereunder by a
successor Agent, such successor Agent shall thereupon succeed to and become
vested with all the rights, powers, privileges and duties of the retiring Agent,
and the retiring Agent shall be discharged from its duties and obligations
hereunder. After any retiring Agent's resignation hereunder as the Agent, the
provisions of this Section 11 shall continue in effect for its benefit in
respect of any actions taken or omitted to be taken by it while it was acting as
the Agent hereunder.

          11.11  Ratable Sharing.  All principal and interest payments on Loans
                 ---------------                                               
and commitment fees received by the Agent shall be remitted to the Banks in
accordance with their Ratable Shares. Any amounts received by the Agent or any
other Bank upon the sale of any collateral for the Loans or upon the exercise of
any remedies hereunder or under any of the Collateral Documents or upon the
exercise of any right of setoff shall be remitted to the Banks in accordance
with their Ratable Shares; provided, however, that, solely for purposes of the
                           --------  -------                                  
sharing of any amounts received by the Agent or any other Bank, if at the time
of any such receipt the Borrower has defaulted under any agreements regarding
Rate Hedging Obligations with any Bank or the Affiliate of any Bank, such Bank's
Ratable Share shall be proportionately increased and the Ratable Shares of the
other Banks shall be proportionately decreased based upon the amount due to such
Bank pursuant to the such agreements.  If any Bank shall obtain any payment
hereunder (whether voluntary, involuntary, through exercise of any right of set-
off or otherwise) in excess of its Ratable Share, then such Bank shall
immediately remit such excess to the other Banks pro rata.

          11.12  Actions by the Agent and the Banks. The Agent shall take formal
                 ----------------------------------
action only upon the agreement of the Majority Banks; provided, however, that if
                                                      --------  -------
the Agent gives notice to the Banks of a Possible Default or an Event of
Default, and the Majority Banks cannot agree (which agreement shall not be
unreasonably withheld) on a mutual course of action within ten days following
such notice, the Agent may (but shall not be required to) pursue such legal
rights and remedies against the Borrower as it deems necessary and appropriate
to protect the Banks and any collateral under the circumstances.


 SECTION 12.   MISCELLANEOUS.
               ------------- 

          12.1  Construction.  The provisions of this Agreement shall be in
                ------------                                               
addition to those of the Collateral Documents and to those of any other
guaranty, security agreement, note or other evidence of the liability relating
to the Borrower held by the Banks, all of which shall be construed as
complementary to each other.  Nothing contained herein shall prevent the Banks
from enforcing any or all of such instruments in accordance with their

                                      -78-
<PAGE>
 
respective terms.  Each right, power or privilege specified or referred to in
this Agreement or in any Collateral Document is in addition to any other rights,
powers or privileges that the Banks may otherwise have or acquire by operation
of law, by other contract or otherwise.  No course of dealing in respect of, nor
any omission or delay in the exercise of, any right, power or privilege by the
Banks shall operate as a waiver thereof, nor shall any single or partial
exercise thereof preclude any further or other exercise thereof or of any other,
as each right, power or privilege may be exercised independently or concurrently
with others and as often and in such order as the Banks may deem expedient.
Notwithstanding any other provision of this Agreement, the Borrower shall not be
required to pay any amount pursuant hereto which is in excess of the maximum
amount permitted by law.

          12.2   Further Assurance. From time to time, the Borrower shall
                 -----------------
execute and deliver to the Agent and the Banks such additional documents and
take such additional actions as the Agent may require to carry out the purposes
of this Agreement or any of the Collateral Documents, or to preserve and protect
the rights of the Agent and the Banks hereunder or thereunder.

           12.3  Expenses of the Agent and the Banks; Indemnification.
                 ---------------------------------------------------- 

                 (a)  Whether or not the transactions contemplated by this
Agreement are consummated, the Borrower shall pay the costs and expenses,
including the reasonable fees and disbursements of the Agent's special counsel,
incurred by the Banks in connection with (i) the negotiation, preparation,
administration, amendment or enforcement of this Agreement and the Collateral
Documents and the closing of the transactions contemplated hereby and thereby;
(ii) the perfection of the Liens granted pursuant hereto or the Collateral
Documents; (iii) the making of the Loans and issuance of the Letters of Credit
hereunder; (iv) the negotiation, preparation or enforcement of any other
document in connection with this Agreement, the Collateral Documents or the
Loans made hereunder; (v) any proceeding brought or formal action taken by the
Banks to enforce any provision of this Agreement or any Collateral Document, or
to enforce or exercise or preserve any right, power or remedy hereunder or
thereunder; or (vi) any action which may be taken or instituted by any Person
against any Bank as a result of any of the foregoing. The fees and expenses of
the Agent's special counsel through the Closing shall be paid on the Closing
Date. If any taxes, charges or fees shall be payable, or ruled to be payable, to
any state or Federal authority in respect of the execution, delivery or
performance of this Agreement, any Note or any other Collateral Document by
reason of any existing or hereinafter enacted Federal or state statute (other
than any such taxes on the net income of the Banks and any taxes, charges or
fees which are included in the LIBOR Reserve Percentage), the Borrower will pay
all such taxes, charges or fees, including interest and penalties thereon, if
any, and will indemnify and 

                                      -79-
<PAGE>
 
hold harmless the Agent and the Banks against any liability in connection
therewith.

               (b)  The Borrower hereby indemnifies and holds harmless the Agent
and each Bank and their respective directors, officers, employees, agents,
counsel, subsidiaries and affiliates (the "Indemnified Persons") from and
against any and all losses, liabilities, obligations, damages, penalties,
actions, judgments, suits, costs, expenses or disbursements of any kind or
nature whatsoever (including reasonable attorneys fees) which may be imposed on,
incurred by, or asserted against any Indemnified Person in any way relating to
or arising out of this Agreement, the Collateral Documents, or any of them or
any of the transactions contemplated hereby or thereby or the business, assets
or operations of the Borrower or the ownership, maintenance, operation or
management of the Towers; provided, however, that the Borrower shall not be
                          --------  -------
liable to any Indemnified Person, if there is a final judicial determination
that such losses, liabilities, obligations, damages, penalties, actions,
judgments, suits, costs, expenses or disbursements resulted solely from the
gross negligence or willful misconduct of such Indemnified Person.

               12.4 Notices.  Except as otherwise expressly provided herein, all
                    -------                                                     
notices, demands and requests required or permitted to be given under the
provisions of this Agreement shall be in writing and shall be deemed to have
been duly delivered and received (a) on the date of personal delivery, (b) on
the date of receipt (as shown on the return receipt) if mailed by registered or
certified mail, postage prepaid and return receipt requested, (c) on the next
business day after delivery to a courier service that guarantees delivery on the
next business day if the conditions to the courier's guarantee are complied
with, or (d) on the date of receipt (if such date is a Banking Day, otherwise on
the next Banking Day) by telecopy, in each case addressed as follows:

               TO THE AGENT:
         
               Society National Bank
               127 Public Square
               Cleveland, Ohio  44114-1306
               Attn:  Theodore W. Frank
                      Media Finance Division
               Telecopy:  216-689-4666
         
               Copy to:
         
               Timothy J. Kelley, Esq.
               Dow, Lohnes & Albertson
               1255 Twenty-third Street, N.W.
               Suite 500
               Washington, D.C.  20037
               Telecopy:  202-857-2900

                                      -80-
<PAGE>
 
               TO THE BANKS, AT THE ADDRESSES LISTED ON THE SIGNATURE PAGES
               HEREOF OR IN THE ASSIGNMENT INSTRUMENT DELIVERED PURSUANT TO
               SECTION 12.7(b)

               TO THE BORROWER:
         
               Castle Tower Corporation
               510 Bering Drive
               Suite 310
               Houston, Texas  77057
               Attention:  President
               Telecopy:  713-789-7651
         
               with a copy to:
         
               Robert C. Walker, Esq.
               Brown, Parker & Leahy, L.L.P.
               1200 Smith Street
               Suite 3600
               Houston, TX  77002-4595
               Telecopy:  713-654-1871

or to such other address or addresses as the party to which such notice is
directed may have designated in writing to the other parties hereto.

               12.5  Waiver and Release by the Borrower. The Borrower hereby
                     ----------------------------------
releases the Agent and each Bank from, and hereby waives, all claims for loss or
damage caused by any act or omission on the part of the Agent or any Bank or
their respective officers, attorneys, agents and employees, except gross
negligence and willful misconduct.

               12.6  Right of Set Off. Upon the occurrence and during the
                     ----------------
continuance of any Event of Default, each Bank is hereby authorized at any time
and from time to time, to the fullest extent permitted by law, to set-off and
apply any and all deposits (general or special, time or demand, provisional or
final) at any time held and other indebtedness at any time owing by such Bank to
or for the credit or the account of the Borrower against any and all of the
obligations of the Borrower now or hereafter existing hereunder or under any
Collateral Document, irrespective of whether or not such Bank shall have made
any demand under any Collateral Document and although such obligations may be
unmatured. The rights of the Banks under this Section are in addition to other
rights and remedies (including without limitation, other rights of set-off)
which the Banks may have. The Borrower agrees, to the fullest extent it may
effectively do so under applicable law, that any other holder of a participation
in any Note may exercise rights of set-off or counterclaim and other rights with
respect to such participation as fully as if such holder of a participation were
a direct creditor of the Borrower in the amount of such participation.

               12.7  Successors and Assigns; Participations.
                     -------------------------------------- 

                                      -81-
<PAGE>
 
               (a)   Whenever in this Agreement any of the parties hereto is
referred to, such reference shall be deemed to include the successors and
assigns of such party; provided, however, that the Borrower shall not assign or
                       --------  -------
transfer any of its rights or obligations hereunder or under any Note without
the prior written consent of all of the Banks and the Agent.

               (b)   Each Bank may, with the consent of the Agent, assign all or
any part of the Loans, any Note and the Commitments to a financial institution;
provided, however, that any partial assignment shall be an amount of at least
- --------  -------                                                            
$5,000,000.  Upon execution and delivery by the assignee and such Bank of an
instrument in writing pursuant to which such assignee agrees to become a "Bank"
hereunder having the share of the Commitments and Loans specified in such
instrument, the assignee shall have, to the extent of such assignment (unless
otherwise provided in such assignment), the obligations, rights and benefits of
a Bank hereunder holding the share of the Commitments and Loans (or portions
thereof) assigned to it (in addition to the share of the Commitments and Loans,
if any, theretofore held by such assignee) and the assigning Bank shall, to the
extent of such assignment, be released from the share of the Commitments and the
obligations hereunder so assigned.  The assignee shall pay to the Agent a
processing and recordation fee of $5,000.

               (c)   Within five business days after receipt of notice of any
assignment pursuant to Section 12.7(b) above, the Borrower, at its expense,
shall execute and deliver in exchange for any surrendered Notes new Notes to the
order of the assignee in an amount equal to the share of the Commitments and of
the Loans assumed by the assignee and, if the assigning Bank has retained a
portion of the Commitments and the Loans hereunder, new Notes to the order of
the assigning Bank in an amount equal to the share of the Commitments and the
Loans retained by it hereunder.  Such new Notes shall be in an aggregate
principal amount equal to the aggregate principal amount of such surrendered
Notes, shall be dated the effective date of such assignment and shall otherwise
be in substantially the form of Exhibit A, Exhibit B or Exhibit C hereto, as the
                                ---------  ---------    ---------               
case may be. The cancelled Notes shall be returned to the Borrower.

               (d)   A Bank may sell or agree to sell to one or more other
Persons a participation in all or any part of the Loans or in the Commitments,
in which event each purchaser of a participation (a "Participant") shall be
                                                     -----------
entitled to the rights and benefits of the provisions of Section 7.5 with
respect to its participation in such Loans and share of the Commitments as if
(and the Borrower shall be directly obligated to such Participant under such
provisions as if) such Participant were a "Bank" for purposes of said Section,
but, except as otherwise provided in the last sentence of this Section 12.7(d),
shall not have any other rights or benefits under this Agreement or any Note or
any other Collateral Documents (the Participant's rights against such Bank in
respect of such participation to be those set forth in the agreements executed
by such Bank in favor of the 

                                      -82-
<PAGE>
 
Participant). All amounts payable by the Borrower to any Bank under Section 2 in
respect of the Loans shall be determined as if such Bank had not sold or agreed
to sell any participations in such Loans and as if such Bank were funding each
of such Loans in the same way that it is funding the portion of such Loan in
which no participations have been sold. The Borrower agrees that each
Participant shall be entitled to the benefits of Sections 2.7 through 2.13 and
Section 12.6 with respect to its participating interest.

               (e)  In addition to the assignments and participations permitted
under the foregoing provisions of this Section 12.7, any Bank may assign and
pledge all or any portion of its Loans and the Notes to any Federal Reserve Bank
as collateral security pursuant to Regulation A of the Board of Governors of the
Federal Reserve System and any Operating Circular issued by such Federal Reserve
Bank. No such assignment shall release the assigning Bank from its obligations
hereunder.

               (f)  A Bank may furnish any information concerning the Borrower
in the possession of such Bank from time to time to assignees and participants
(including prospective assignees and participants).

               (g)  Anything in this Section 12.7 to the contrary
notwithstanding, no Bank may assign or participate any interest in any Loan held
by it hereunder to the Borrower or any of its Affiliates without the prior
written consent of each Bank.

         12.8  Applicable Law.  THIS AGREEMENT AND THE COLLATERAL DOCUMENTS, AND
               --------------                                                   
THE DUTIES, RIGHTS, POWERS AND REMEDIES OF THE PARTIES HERETO AND THERETO, SHALL
BE CONSTRUED IN ACCORDANCE WITH, AND GOVERNED BY, THE LAWS OF THE STATE OF OHIO
(WITHOUT REGARD TO THE CONFLICTS OF LAWS PROVISIONS THEREOF), EXCEPT TO THE
EXTENT THAT ANY COLLATERAL DOCUMENT PROVIDES THAT THE LOCAL LAW OF ANOTHER
JURISDICTION GOVERNS THE GRANT, PERFECTION AND ENFORCEMENT OF THE LIENS GRANTED
PURSUANT TO SUCH COLLATERAL DOCUMENT.

         12.9  Binding Effect and Entire Agreement; No Oral Agreements.  This
               -------------------------------------------------------       
Agreement shall inure to the benefit of, and shall be binding upon, the
respective successors and permitted assigns of the parties hereto.  This
Agreement, the Schedules and Exhibits hereto, which are hereby incorporated in
this Agreement, and the Collateral Documents constitute the entire agreement
among the parties on the subject matter hereof.  There are no unwritten or oral
agreements between the Borrower and the Banks, and this written Agreement, the
Notes, the other Collateral Documents, and the instruments and documents
executed in connection herewith, represent the final agreement between the
parties and may not be contradicted by evidence of prior, contemporaneous or
subsequent oral agreements of the parties.

          12.10 Counterparts.  This Agreement may be executed in any number of
                ------------                                                  
counterparts or duplicate originals, each of which 

                                      -83-
<PAGE>
 
shall be deemed to be an original, but all of which together shall constitute
one and the same instrument.

          12.11 Survival of Agreements.  All covenants, agreements,
                ----------------------                             
representations and warranties made herein or in any Collateral Document shall
survive any investigation and the Closing Date, and shall continue in full force
and effect so long as any of the Obligations remain to be performed or paid or
the Banks have any obligation to advance sums or issue Letters of Credit
hereunder or any Letter of Credit remains outstanding.

          12.12 Modification.  Any term of this Agreement or of any Note may be
                ------------                                                   
amended and the observance of any term of this Agreement or of any Note may be
waived (either generally or in a particular instance and either retroactively or
prospectively) only with the written consent of the Borrower and the Majority
Banks.  Any amendment or waiver effected in accordance with this Section 12.12
shall be binding upon each holder of a Note at the time outstanding, each future
holder of a Note and the Borrower; provided, however, that no such amendment or
                                   --------  -------                           
waiver or other action shall, without the prior written consent of all of the
Banks or the holders of all of the Notes at the time outstanding, (a) extend the
maturity or reduce the principal amount of, or reduce the rate or extend the
time of payment of interest on, or reduce the amount or extend the time of
payment of any principal of, any Note, (b) reduce the amount or extend the time
of payment of the commitment fees, (c) change the Commitments or the Ratable
Share of any Bank (other than any change in Commitments or Ratable Share
resulting from the sale of a participation in or assignment of any Bank's
interest in the Commitments and Loans in accordance with Section 12.7), (d)
change the percentage referred to in the definition of "Majority Banks"
contained in Section 1.1, (e) amend this Section 12.12, (f) amend or waive
compliance with Section 2.7(b), or (g) release any collateral for the Loans
except for collateral which the Borrower is not prohibited pursuant hereto from
selling; and provided, further, that notwithstanding the foregoing provisions of
             --------  -------                                                  
this Section 12.12, this Agreement and the Notes may be amended or modified in
the manner contemplated by Section 12.7 for the purpose of permitting any Bank
to assign its interest, rights and obligations hereunder to another bank or
financial institution, if the appropriate assignment agreement or counterparts
thereof are executed by the Borrower (to the extent required), the Agent and the
appropriate Bank assignor and assignee.  Any amendment or waiver effected in
accordance with this Section 12.12 shall be binding upon each holder of any Note
at the time outstanding, each future holder of any Note and the Borrower.

          12.13 Separability.  If any one or more of the provisions contained in
                ------------                                                    
this Agreement or any Collateral Document should be invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of all
remaining provisions shall not in any way be affected or impaired.  Any
provision of this Agreement which is prohibited or unenforceable in any
jurisdiction shall, as to such jurisdiction, be ineffective to 

                                      -84-
<PAGE>
 
the extent of such prohibition or unenforceability without invalidating the
remaining provisions hereof or affecting the validity or enforceability of such
provision in any other jurisdiction.

          12.14 Section Headings.  The section headings contained herein are for
                ----------------                                                
reference purposes only and shall not in any way affect the meaning or
interpretation of this Agreement.

          12.15 Enforcement.  THE BORROWER (A) HEREBY IRREVOCABLY SUBMITS TO THE
                -----------                                                     
JURISDICTION OF THE STATE COURTS OF THE STATE OF OHIO AND TO THE JURISDICTION OF
THE UNITED STATES DISTRICT COURT FOR THE NORTHERN DISTRICT OF OHIO, FOR THE
PURPOSE OF ANY SUIT, ACTION OR OTHER PROCEEDING ARISING OUT OF OR BASED UPON
THIS AGREEMENT OR ANY COLLATERAL DOCUMENT OR THE SUBJECT MATTER HEREOF OR
THEREOF BROUGHT BY THE BANKS OR THEIR SUCCESSORS OR ASSIGNS AND (B) HEREBY
WAIVES, AND AGREES NOT TO ASSERT, BY WAY OF MOTION, AS A DEFENSE, OR OTHERWISE,
IN ANY SUCH SUIT, ACTION OR PROCEEDING, ANY CLAIM THAT IT IS NOT SUBJECT
PERSONALLY TO THE JURISDICTION OF THE ABOVE-NAMED COURTS, THAT ITS PROPERTY IS
EXEMPT OR IMMUNE FROM ATTACHMENT OR EXECUTION, THAT THE SUIT, ACTION OR
PROCEEDING IS BROUGHT IN AN INCONVENIENT FORUM, THAT THE VENUE OF THE SUIT,
ACTION OR PROCEEDING IS IMPROPER OR THAT THIS AGREEMENT OR ANY COLLATERAL
DOCUMENT OR THE SUBJECT MATTER HEREOF OR THEREOF MAY NOT BE ENFORCED IN OR BY
SUCH COURT, AND (C) HEREBY WAIVES AND AGREES NOT TO SEEK ANY REVIEW BY ANY COURT
OF ANY OTHER JURISDICTION WHICH MAY BE CALLED UPON TO GRANT AN ENFORCEMENT OF
THE JUDGMENT OF ANY SUCH OHIO STATE OR FEDERAL COURT.  THE BORROWER HEREBY
CONSENTS TO SERVICE OF PROCESS BY REGISTERED MAIL AT THE ADDRESS TO WHICH
NOTICES ARE TO BE GIVEN. THE BORROWER AGREES THAT ITS SUBMISSION TO JURISDICTION
AND ITS CONSENT TO SERVICE OF PROCESS BY MAIL IS MADE FOR THE EXPRESS BENEFIT OF
THE BANKS.  FINAL JUDGMENT AGAINST THE BORROWER IN ANY SUCH ACTION, SUIT OR
PROCEEDING MAY BE ENFORCED IN OTHER JURISDICTIONS BY SUIT, ACTION OR PROCEEDING
ON THE JUDGMENT, OR IN ANY OTHER MANNER PROVIDED BY OR PURSUANT TO THE LAWS OF
SUCH OTHER JURISDICTION; PROVIDED, HOWEVER, THAT THE BANKS MAY AT THEIR OPTION
                         --------  -------                                    
BRING SUIT, OR INSTITUTE OTHER JUDICIAL PROCEEDINGS, AGAINST THE BORROWER OR ANY
OF ITS ASSETS IN ANY STATE OR FEDERAL COURT OF THE UNITED STATES OR OF ANY
COUNTRY OR PLACE WHERE THE BORROWER, OR SUCH ASSETS, MAY BE FOUND.

          12.16 Termination. This Agreement shall terminate when all amounts due
hereunder, under each Note and under each Collateral Document shall have been
indefeasibly paid in full in cash and all other Obligations hereunder or
thereunder shall have been fully performed, so long as no Letters of Credit are
then outstanding and the Banks have no further obligation to advance sums or
issue Letters of Credit hereunder. Notwithstanding the foregoing, this Agreement
shall continue to be effective or be reinstated and relate back to such time as
though this Agreement had always been in effect, as the case may be, if at any
time any amount received by any Bank in respect of the Obligations is rescinded
or must otherwise be restored or returned by such Bank upon the insolvency,
bankruptcy, dissolution, liquidation or 

                                      -85-
<PAGE>
 
reorganization of the Borrower or upon the appointment of any intervenor or
conservator of, or trustee or similar official for, the Borrower or any
substantial part of its properties, or other wise, all as though such payments
had not been made.

          12.17 Jury Trial Waiver.  THE BORROWER AND THE BANKS EACH WAIVE ANY
                -----------------                                            
RIGHT TO HAVE A JURY PARTICIPATE IN RESOLVING ANY DISPUTE, WHETHER SOUNDING IN
CONTRACT, TORT OR OTHERWISE, BETWEEN THE BANKS AND THE BORROWER ARISING OUT OF,
IN CONNECTION WITH, RELATED TO, OR INCIDENTAL TO THE RELATIONSHIP ESTABLISHED
BETWEEN THEM IN CONNECTION WITH THIS AGREEMENT OR ANY NOTE OR OTHER INSTRUMENT,
DOCUMENT OR AGREEMENT EXECUTED OR DELIVERED IN CONNECTION HEREWITH OR THE
TRANSACTIONS RELATED THERETO.

          12.18 Interest Limitation. It is the intention of the Borrower and the
                -------------------
Banks to conform strictly to the respective usury laws applicable to the Banks.
Accordingly, if the transactions contemplated hereby would be usurious under
applicable law as to any Bank, then, in that event, notwithstanding anything to
the contrary in the Notes or this Agreement or in any other Collateral Document,
it is agreed as follows: (a) the aggregate of all consideration which
constitutes interest under law applicable to such Bank that is contracted for,
taken, reserved, charged or received under any Note payable to such Bank or this
Agreement or under any other Collateral Document or otherwise in connection with
such Note shall under no circumstances exceed the maximum amount allowed by such
Note (or, if the principal amount of such Note shall have been or would thereby
be paid in full, refunded to the Borrower); and (b) in the event that the
maturity of any Note payable to a Bank is accelerated or in the event of any
required or permitted prepayment, then such consideration that constitutes
interest under law applicable to such Bank may never include more than the
maximum amount allowed by such applicable law, and excess interest, if any,
provided for in this Agreement or otherwise shall be cancelled automatically as
of the date of such acceleration or prepayment and, if theretofore paid, shall
be credited by such Bank on the principal amount of such Note (or, if the
principal amount of such Note shall have been or would thereby be paid in full,
refunded by such Bank to the Borrower). All calculations made to compute the
rate of interest that is contracted for, taken, reserved, charged or received
under any Note payable to any Bank or under this Agreement or under any other
Collateral Document or otherwise in connection with such Note for the purpose of
determining whether such rate exceeds the maximum amount allowed by law
applicable to such Bank shall be made, to the extent permitted by such
applicable law, by amortizing, prorating, and spreading in equal parts during
the period of the full stated term of the Loan or Loans evidenced by such Note
all interest at any time contracted for, taken, reserved, charged or received by
such Bank in connection therewith.

          12.19 DTPA Waiver.  TO THE MAXIMUM EXTENT NOT PROHIBITED BY APPLICABLE
                -----------                                                     
LAW FROM TIME TO TIME IN EFFECT, THE 

                                      -86-
<PAGE>
 
BORROWER HEREBY KNOWINGLY, VOLUNTARILY AND INTENTIONALLY (AND AFTER THE BORROWER
HAS CONSULTED WITH ITS OWN ATTORNEY), IRREVOCABLY AND UNCONDITIONALLY WAIVES THE
PROVISIONS OF THE TEXAS DECEPTIVE TRADE PRACTICES - CONSUMER PROTECTION ACT
(TEXAS BUSINESS AND COMMERCE CODE, CHAPTER 17, SECTION 17.41 - 17.63).

                                      -87-
<PAGE>
 
          TO WITNESS THE ABOVE, the Borrower, the Banks and the Agent have
caused this Loan Agreement to be executed by their respective representatives
thereunto duly authorized as of the date first above written.


BORROWER:

CASTLE TOWER CORPORATION



By: /s/ TED MILLER, JR.
   --------------------------------

Name: Ted Miller, Jr.
     ------------------------------

Title: President
      -----------------------------


AGENT:

SOCIETY NATIONAL BANK



By: /s/ THEODORE W. FRANK
   --------------------------------
Name:  Theodore W. Frank
Title: Vice President


BANKS:

SOCIETY NATIONAL BANK



By: /s/ THEODORE W. FRANK
   --------------------------------
Name:  Theodore W. Frank
Title: Vice President

Address:  127 Public Square
          Cleveland, Ohio  44114-1306
          Attn:  Media Finance Division

                                      -88-
<PAGE>
 
FIRST INTERSTATE BANK OF TEXAS, N.A.



By: /s/ BENNETT D. DOUGLAS
   ---------------------------------
Name:  Bennett D. Douglas
Title: Vice President

Address:  First Interstate Bank Plaza
          1000 Louisiana
          Houston, Texas  77002-5093
          Attn:  Bennett D. Douglas, Vice President

                                      -89-
<PAGE>
 
                         LIST OF SCHEDULES AND EXHIBITS
                         ------------------------------


Schedule 1.1                  Acquisition Advance Worksheet

Schedule 1.2                  List of Banks and Ratable Shares


Exhibit A                     Form of Reducing Note

Exhibit B                     Form of Working Capital Note

Exhibit C                     Form of Term Note

Exhibit D                     Financial Statements

Exhibit E                     Projections

Exhibit F                     Capitalization

Exhibit G                     Proceedings, Litigation and Non-
                              Compliance with Law

Exhibit H                     Liens and Indebtedness

Exhibit I                     List of Contracts, Commitments and Licenses

Exhibit J                     ERISA Liabilities and Plans

Exhibit K                     Real Property List

Exhibit L                     Form of Compliance Certificate

                                      -90-
<PAGE>
 
                                  SCHEDULE 1.1
                                  ------------

                         Acquisition Advance Worksheet
                         -----------------------------


Pursuant to the Loan Agreement, this Acquisition Advance Worksheet shall be used
to determine borrowing availability under the Reducing Commitment and must be
presented to the Agent prior to each draw under such facility.  This Worksheet
should be completed according to the steps detailed herein, in sequential order.

=========
Step #1
=========

Specifically excluding the acquisition for which availability is being
calculated herein ("Current Acquisition"), enter Annualized Operating Cash Flow
                    -------------------                                        
("AOCF") for each Division A and Division B Acquisition for the most recently
completed fiscal quarter.  (For Division A and Division B Acquisitions made
since the beginning of the most recently completed fiscal quarter, use the
trailing twelve month operating cash flow of such acquired towers or of the
acquired management agreement.) Operating expenses should be allocated between
the Divisions according to each Division's gross profit contribution (Division
gross profit/total gross profit).

                                                   ----------------
                                Division A: AOCF                    (a)
                                                   ----------------
                                Division B: AOCF                    (b)
                                                   ----------------
=========
Step #2
=========

Pursuant to the definitions of Division A Acquisition and Division B Acquisition
in the Loan Agreement, indicate the division classification for the Current
Acquisition and enter the trailing twelve month operating cash flow of such
acquired towers or of the acquired management agreement.

                                                   ----------------
                         Division Classification                    (c)
                                                   ----------------
                         Acquisition OCF                            (d)
                                                   ----------------

                                      -91-
<PAGE>
 
=========
Step #3
=========

If the Current Acquisition is a Division B Acquisition, enter the required
information regarding the Current Acquisition in the "Division B - Average
Acquisition Leverage Worksheet", set forth below, immediately after the
information regarding the most recent Division B Acquisition (if any), including
the number of towers purchased, date of purchase, name of seller, operating cash
flow for the most recently completed twelve month period (figure does not change
from original for subsequent calculations), and the funds to be paid to the
seller.  An acquisition from a single buyer cannot be sub-divided into multiple
purchases for division classification purposes. Excluding the Purchase
Agreement, any assets covered by a single purchase agreement, but to be
purchased in stages, must be classified according to their consolidated purchase
multiple.  In addition, multiple purchases from the same seller (excluding the
Sellers) on a trailing three month basis must be classified according to their
blended purchase multiple.  The "Division B -Average Acquisition Leverage
Worksheet" calculates an "Acquisition Leverage Multiple" for each acquisition
equal to 73% of the Purchase Multiple (or 67%, pursuant to Section 2.4(d)(i) of
the Loan Agreement, if the Borrower uses any proceeds of the Reducing Loans to
prepay any portion of the Term Loans).  A Weighted Average Leverage Multiple is
then calculated for all Division B Acquisitions.

DIVISION B -- AVERAGE ACQUISITION LEVERAGE WORKSHEET:


<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
                                                                                               Acquisition
                                                                                                  Leverage
                                                                                                  Multiple      Weighted
                                                                                               (initially,           Avg
               # of        Date of                        OCF as of     Purchase     Purchase       73% of      Leverage
Tower        Towers       Purchase      Seller              date of         Cost     Multiple     Purchase      Multiple
                                                           Acquisi-                              Multiple)
                                                               tion  
- --------------------------------------------------------------------------------------------------------------------------
<S>          <C>          <C>           <C>               <C>           <C>          <C>        <C>             <C> 
1.

2.

3.
- --------------------------------------------------------------------------------------------------------------------------
TOTAL
- --------------------------------------------------------------------------------------------------------------------------
                                    DIVISION B - AVERAGE ACQUISITION LEVERAGE MULTIPLE
                               -------------------------------------------------------------------------------------------
</TABLE>


=========
Step #4
=========

This step calculates borrowing capacity by Division under the Reducing
Commitment. Enter the following information and calculate figures according to
designated formulas.

                                      -92-
<PAGE>
 
<TABLE>
<CAPTION>
<S>                                                                          <C>                      <C> 
Enter balance from box (a)                                                                            (e)
                                                                             -----------------------
If Current Acquisition classified Division A, enter balance from box (d)                              (f)
                                                                             -----------------------
(e) + (f)                                                                                             (g) 
                                                                             ----------------------- 
Multiply box (g) by 5.50                                                                              (h)
                                                                             ----------------------- 
Enter balance from box (b)                                                                            (i)
                                                                             ----------------------- 
If Current Acquisition classified Division B, enter balance from box (d)                              (j)
                                                                             ----------------------- 
(i) + (j)                                                                                             (k)
                                                                             ----------------------- 
Enter Division B - Average Acquisition Leverage Multiple from Step #3                                 (l)
 or the last completed Acquisition Advance Worksheet                      
                                                                             -----------------------  
Multiply (k) by (l)                                                                                   (m)
                                                                             ----------------------- 
</TABLE>

=========
Step #5
=========

This step calculates total availability under the Reducing Commitment for the
Current Acquisition contemplated herein.  Enter the following information and
calculate figures according to designated formulas.

<TABLE>
<CAPTION>
<S>                                                                          <C>                      <C> 
[Total Borrowing Capacity] (h) + (m)                                                                  (n)
                                                                             -----------------------  
Total Debt Outstanding (other than PCI Debt)                                                          (o)
                                                                             -----------------------  
[Acquisition Availability] (n) - (o)                                                                  (p)
                                                                             -----------------------  
Current Acquisition purchase price                                                                    (q)
                                                                             -----------------------  
</TABLE>


Box (p) indicates availability under the Reducing Commitment for the Current
Acquisition.  If box (q) exceeds box (p), the difference must be funded with
equity.

                                      -93-
<PAGE>
 
                                  SCHEDULE 1.2
                                  ------------


                        List of Banks and Ratable Shares
                        --------------------------------
<TABLE>
<CAPTION>
 
 
Banks:               Reducing            Working             Term Loan
- ------               Loan Amount         Capital Loan        Amount and
                     and Ratable         Amount and          Ratable
                     Share of            Ratable             Share of
                     Reducing            Share of            Term Loans:
                     Commitment:         Working             --------------
                     -----------         Capital         
                                         Commitment:     
                                         -----------     
<S>                  <C>                 <C>                 <C>
Society              $13,020,000         $600,000            $1,380,000
                     (60%)               (60%)               (60%)
First                $8,680,000          400,000             $920,000
Interstate           (40%)               (40%)               (40%)
</TABLE>

                                      -94-

<PAGE>
 
                                                                   Exhibit 10.3

                       FIRST AMENDMENT TO LOAN AGREEMENT


          This FIRST AMENDMENT TO LOAN AGREEMENT is made and entered into as of
June 26, 1996, by and among CASTLE TOWER CORPORATION, a Delaware corporation
("CTC-Del"), CASTLE TOWER CORPORATION (PR), a Puerto Rican corporation ("CTC-PR"
and, together with CTC-Del, collectively, the "Borrowers" and individually, a
"Borrower"), the FINANCIAL INSTITUTIONS listed on the signature pages hereof,
and KEYBANK NATIONAL ASSOCIATION (formerly known as "Society National Bank"), as
agent (the "Agent").


                                    RECITALS
                                    --------

          A.  CTC-Del, the Agent and the Banks entered into a Loan Agreement
dated as of April 26, 1995 (the "Original Agreement"), pursuant to which the
Banks agreed to make available to CTC-Del loans of up to $25,000,000.  The
Original Agreement, as amended hereby, may be referred to hereinafter as the
"Loan Agreement."  Capitalized terms used herein and not otherwise defined shall
have the meanings assigned to them in the Loan Agreement.

          B.  CTC-Del has created CTC-PR as its wholly owned Subsidiary in order
to acquire all of the Puerto Rico radio communication tower business,
specialized mobile radio business and microwave business of Motorola, Inc.,
Motorola Communications and Electronics, Inc. and Motorola De Puerto Rico, Inc.
CTC-PR desires to become a party to the Loan Agreement as a borrower. Subject to
the terms and conditions of this Amendment, the Agent and the Banks have agreed
to such request.


                                   AGREEMENTS
                                   ----------

          In consideration of the foregoing Recitals and of the covenants and
representations contained herein, and for other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the Borrowers, the
Agent and the Banks agree as follows:

          1.  Joinder.  CTC-PR is hereby added as a Borrower to the Original
              -------                                                       
Agreement and shall be deemed to be a Borrower for all purposes of the Original
Agreement and the Collateral Documents.  CTC-PR agrees to be bound by all of the
terms, conditions, obligations and covenants applicable to the Borrower under
the Original Agreement as if it were an original signatory thereto.  Every
reference in the Original Agreement or any Collateral Document to "the Borrower"
shall be deemed to be a 
<PAGE>
 
reference to each of CTC-Del and CTC-PR individually. All financial and
accounting calculations and determinations shall be made on a combined basis for
the Borrowers. All obligations and liabilities of CTC-Del under the Original
Agreement shall be the joint and several obligations and liabilities of the
Borrowers.

          2.  Amendments.  Subject to the satisfaction of the conditions set
              ----------                                                    
forth in Section 4 of this Amendment, the Original Agreement shall be amended as
follows:

               (a)  Section 1.1 shall be amended by adding thereto the following
new definitions in the proper alphabetical order:

               "Borrowers" means CTC-Del and CTC-PR.
                ---------                           

               "CTC-Del" means Castle Tower Corporation, a Delaware corporation.
                -------                                                         

               "CTC-PR" means Castle Tower Corporation (PR), a Puerto Rico
                ------                                                    
          corporation.

               "First Amendment" means the First Amendment to Loan Agreement
                ---------------                                             
          dated as of June 26, 1996, among the Borrowers, the Agent and the
          Banks.

               "Motorola Purchase Agreement" means the Purchase and Sale
                ---------------------------                             
          Agreement dated as of May 24, 1996, among CTC-Del (which has assigned
          its interest therein to CTC-PR) and the Motorola Sellers.

               "Motorola Sellers" Motorola, Inc., a Delaware corporation,
                ----------------                                         
          Motorola Communications and Electronics, Inc., a Illinois corporation,
          and Motorola De Puerto Rico, Inc., a Delaware corporation.

               (b)  Section 5 of the Original Agreement shall be amended in its
entirety to read as follows:

          SECTION 5      REPRESENTATIONS AND WARRANTIES OF THE BORROWERS.
                         ----------------------------------------------- 

               To induce the Banks to enter into this Agreement and to make the
          Loans, the Borrowers, jointly and severally, represent and warrant as
          follows:

                                      -2-
<PAGE>
 
                5.1  Organization and Powers.  CTC-Del is a corporation, duly
                     -----------------------                                 
          organized, validly existing and in good standing under the laws of the
          State of Delaware. CTC-PR is a corporation, duly organized, validly
          existing and in good standing under the laws of the Commonwealth of
          Puerto Rico.  Each Borrower is duly qualified or registered to conduct
          business and in good standing under the laws of each jurisdiction in
          which any Tower owned or leased by it is located and of each other
          jurisdiction in which the character of its business or the ownership
          of its assets makes such qualification or registration necessary,
          except where failure to so qualify or register could not reasonably be
          expected to have a Material Adverse Effect.  Each Borrower has all
          requisite power and authority to own and operate its properties, to
          carry on its business as now conducted and proposed to be conducted,
          to enter into the Purchase Agreement, the Motorola Purchase Agreement,
          this Agreement and the Collateral Documents to which it is a party and
          all other documents to be executed by it in connection with the
          transactions contemplated hereby and thereby and to carry out the
          terms hereof and thereof.

                5.2  Authorization.  All necessary corporate, stockholder or
                     -------------                                          
          other actions on the part of each Borrower to authorize the execution
          and delivery of the Purchase Agreement, the Motorola Purchase
          Agreement, this Agreement and the Collateral Documents, and the
          performance of the obligations of such Borrower herein and therein,
          have been taken.  This Agreement, the Purchase Agreement, the Motorola
          Purchase Agreement and each Collateral Document have been duly
          authorized and executed and are valid and legally binding upon each
          Borrower to the extent it is a party thereto, and enforceable in
          accordance with their respective terms, except to the extent that the
          enforceability thereof may be limited by bankruptcy, insolvency or
          like laws affecting creditors rights generally and the availability of
          equitable remedies.

                5.3  Financial Statements.  Exhibit D attached to the First
                     --------------------   ---------                      
          Amendment contains Holdco's audited financial statements as of
          December 31, 1995, and for the fiscal year then ended, including a
          balance sheet, income statement and statement of cash flows and
          Holdco's financial statements as of March 31, 1996, and for the three
          month period then ended, including a balance sheet, income statement
          and statement of cash flows, and within thirty (30) days of the date
          hereof, CTC-Del 

                                      -3-
<PAGE>
 
          will provide the Agent with CTC-Del's audited financial statements as
          of December 31, 1995, and for the fiscal year then ended, including a
          balance sheet, income statement and statement of cash flows and CTC-
          Del's financial statements as of March 31, 1996, and for the three
          month period then ended, including a balance sheet, income statement
          and statement of cash flows (the "Financial Statements"). The
          Financial Statements are true and complete in all material respects,
          disclose all material contingent liabilities and present fairly the
          financial condition and results of operations of CTC-Del as of the
          dates and for the periods indicated and have been prepared in
          accordance with GAAP, subject in the case of statements for interim
          periods to normal year-end adjustments and to the absence of
          footnotes.

                5.4  Projections.  Exhibit E attached to the First Amendment are
                     -----------   ---------                                    
          the Borrowers' projections for the calendar years 1996 through 2001.
          Such projections were prepared on an operating basis and assume the
          consummation of the transactions contemplated in the Purchase
          Agreement and the Motorola Purchase Agreement. Such projections
          represent the Borrowers' best estimate of projected future operations
          as of the date of this Agreement.

                5.5  Capitalization of the Borrower.  The capitalization of
                     ------------------------------                        
          Holdco and of the Borrowers as of the date of the First Amendment is
          as set forth on Exhibit F attached to the First Amendment, including
                          ---------                                           
          the identity of each Stockholder and the number of shares of stock of
          each Stockholder.  Holdco owns all of the issued and outstanding
          capital stock of CTC-Del, and CTC-Del owns all of the issued and
          outstanding capital stock of CTC-PR.  All of the issued and
          outstanding shares of capital stock of each Borrower have been duly
          and validly issued and are fully paid and nonassessable.  All of the
          authorized, issued and outstanding shares of capital stock of each
          Borrower are free and clear of any Liens, except as disclosed on
          Exhibit F attached to the First Amendment, and except for the Lien in
          ---------                                                            
          favor of the Agent.  None of such capital stock has been issued in
          violation of the Securities Act of 1933, as amended, or the securities
          or "Blue Sky" or any other applicable laws, rules or regulations of
          any applicable jurisdiction.  Except as set forth on such Exhibit F,
                                                                    --------- 
          as of the date of the First Amendment, neither Borrower has any
          commitment or obligation, either firm or conditional, to issue,

                                      -4-
<PAGE>
 
          deliver, purchase or sell, under any offer, option agreement, bonus
          agreement, purchase plan, incentive plan, compensation plan, warrant,
          conversion rights, contingent share agreement, stockholders agreement,
          partnership agreement or otherwise, any capital stock or other equity
          securities or securities convertible into shares of capital stock or
          other equity securities.

                5.6  Subsidiaries.  Neither Borrower has any Subsidiaries,
                     ------------                                         
          except that CTC-PR is a wholly owned Subsidiary of CTC-Del.

                5.7  Title to Properties; Patents, Trademarks, Etc.  Each
                     ----------------------------------------------      
          Borrower has, and will have after giving effect to the closings under
          the Purchase Agreement and the Motorola Purchase Agreement, good and
          marketable title to all of its material assets, whether real or
          personal, tangible or intangible, free and clear of any Liens or
          adverse claims or interests, except Permitted Liens.  Each Borrower
          owns or possesses, and will own or possess after giving effect to the
          closings under the Purchase Agreement and the Motorola Purchase
          Agreement, the valid right to use all the material patents,
          trademarks, service marks, trade names, copyrights and licenses and
          rights in respect of the foregoing necessary for the conduct of its
          business, without any known conflict with the rights of others.

                5.8  Litigation; Proceedings.  Except as disclosed on Exhibit G
                     -----------------------                          ---------
          attached to the First Amendment, there is no action, suit, proceeding,
          inquiry or investigation at law or in equity, or by or before any
          court or governmental instrumentality or agency, nor any order, decree
          or judgment in effect, now pending or, to the best of the Borrowers'
          knowledge, threatened against or affecting either Borrower, any
          Material Towers or any of the properties or rights relating to any
          Material Towers or any other material assets or business of either
          Borrower, which could reasonably be expected to have a Material
          Adverse Effect.  Except as disclosed on Exhibit G to the First
                                                  ---------             
          Amendment, there is no application, petition, complaint, proceeding or
          investigation pending or, to the best of the Borrowers' knowledge,
          threatened, with respect to any License or which could restrict in any
          material manner the ownership, operation or license status of any
          Material Towers or any other material assets or business of either
          Borrower.

                                      -5-
<PAGE>
 
                5.9  Taxes.  All Federal, state and local tax returns, reports
                     -----                                                    
          and statements (including, without limitation, those relating to
          income taxes, withholding, social security and unemployment taxes,
          sales and use taxes and franchise taxes) required to be filed by
          either Borrower have been properly filed with the appropriate
          governmental agencies in all jurisdictions in which such returns,
          reports and statements are required to be filed, which returns,
          reports and statements are complete and accurate, and all taxes and
          other impositions due and payable have been timely paid prior to the
          date on which any fine, penalty, interest, late charge or loss may be
          added thereto for non-payment thereof.  As of the date of the First
          Amendment, neither Borrower has filed with the Internal Revenue
          Service or any other governmental authority any agreement or other
          document extending or having the effect of extending the period for
          assessment or collection of any Federal, state, local or foreign taxes
          or other impositions.  All tax deficiencies asserted or assessments
          made as a result of any examinations conducted by the Internal Revenue
          Service or any other governmental authority relating to either
          Borrower have been fully paid or are being contested in accordance
          with the provisions of Section 7.4.  Proper and accurate amounts have
          been withheld by each Borrower from its employees for all periods to
          fully comply with the tax, social security and unemployment
          withholding provisions of applicable Federal, state, local and foreign
          law.  The charges, accruals and reserves on the books of each Borrower
          in respect of any taxes or other governmental charges for such
          Borrower are adequate.

                5.10  Absence of Conflicts.  The execution, delivery and
                      --------------------                              
          performance of the Purchase Agreement, the Motorola Purchase
          Agreement, this Agreement and the Collateral Documents and all actions
          and transactions contemplated hereby and thereby will not (a) violate,
          be in conflict with, result in a breach of or constitute (with due
          notice or lapse of time or both) a default under (i) any provision of
          the Certificate of Incorporation or By-laws of either Borrower, (ii)
          any arbitration award or any order of any court or of any other
          governmental agency or authority, (iii) any License relating to any
          Material Towers or under which either Borrower operates or will
          operate after giving effect to the closings under the Purchase
          Agreement and the Motorola Purchase Agreement which breach or default
          of such License could reasonably be expected to have a 

                                      -6-
<PAGE>
 
          Material Adverse Effect, or (iv) any applicable law, rule, order or
          regulation (including without limitation, (A) any law, rule,
          regulation or policy of the FAA or any other Licensing Authority or
          (B) Regulations G, T, U or X of the Board of Governors of the Federal
          Reserve System) or any material agreement, instrument or document
          relating to any Material Towers or to which either Borrower is a
          party, or by which either Borrower or any of its properties is bound,
          including, without limitation, the License Agreement or any of the
          leases relating to Material Towers, or (b) result in the creation or
          imposition of any Lien of any nature whatsoever, other than those
          Liens arising hereunder or under the Collateral Documents, upon any of
          the properties of either Borrower.

                5.11  Indebtedness.  Neither Borrower has any Indebtedness of
                      ------------                                           
          any nature, whether due or to become due, absolute, contingent or
          otherwise, including Indebtedness for taxes and any interest or
          penalties relating thereto, except (a) in the case of CTC-Del,
          liabilities reflected in the Financial Statements, (b) the liability
          to pay legal and accounting fees and reasonable closing expenses in
          connection with the First Amendment and the Motorola Purchase
          Agreement, (c) to the extent disclosed on Exhibit H attached to the
                                                    ---------                
          First Amendment and (d) Indebtedness permitted pursuant to Section
          8.1.

                5.12  Compliance.  Except as disclosed on Exhibit G attached to
                      ----------                          ---------            
          the First Amendment, neither Borrower nor, to the best of the
          Borrowers' knowledge, either Seller or any Motorola Seller, is in
          violation of any statute, ordinance, law, rule, regulation or order of
          the United States of America, the FAA, or any other federal, state,
          county, municipal or other governmental agency or authority applicable
          to it, its properties, the maintenance of any Material Towers or the
          conduct of its business, which violation could reasonably be expected
          to have a Material Adverse Effect.  Neither Borrower has violated or
          breached in any material respect the provisions of any material
          indenture, License, agreement, note, lease or other instrument or
          document to which it is a party or by which it is bound, nor does
          there exist any material default, or any event or condition which,
          upon notice or lapse of time, or both, would become a material
          default, under any such material indenture, License, agreement, note,
          lease, or other instrument or document.  Each Borrower has the legal
          right and authority, including without 

                                      -7-
<PAGE>
 
          limitation, necessary authorizations from the FAA, to conduct its
          business as now conducted or proposed to be conducted.

                5.13  Statements Not Misleading.  No statement, representation
                      -------------------------                               
          or warranty made by either Borrower or any other party (other than the
          Agent and the Banks) in or pursuant to this Agreement, the First
          Amendment or the Exhibits attached to the First Amendment or any of
          the Collateral Documents contains or will contain any untrue statement
          of a material fact, nor omits or will omit to state a material fact
          necessary to make such statement not misleading or otherwise violates
          any federal or state securities law, rule or regulation. There is no
          fact known to either Borrower (other than matters of a general
          economic nature) that has had or could reasonably be expected to have
          a Material Adverse Effect and that has not been disclosed herein.

                5.14  Consents or Approvals.  No consent, approval or
                      ---------------------                          
          authorization of, or filing, registration or qualification with, any
          governmental authority or any other Person (including, without
          limitation, the FAA or any other Licensing Authority) is required to
          be obtained by either Borrower in connection with the execution,
          delivery or performance of the Purchase Agreement, the Motorola
          Purchase Agreement, this Agreement or any of the Collateral Documents,
          including, without limitation, in connection with the granting of
          liens and security interests in the assets of either Borrower or in
          the capital stock of either Borrower, which has not already been
          obtained or completed, except for the filing of financing statements
          and the Mortgages and other actions expressly required to be taken
          pursuant to the Collateral Documents.

                5.15  Material Contracts and Commitments.  Exhibit I attached to
                      ----------------------------------   ---------            
          the First Amendment contains a true and complete description of all
          material contracts and commitments of each Borrower as of the date of
          the First Amendment (after giving effect to the closings under the
          Purchase Agreement and the Motorola Purchase Agreement), whether oral
          or written, including, without limitation, (a) those governing any
          Indebtedness; (b) any security agreement, pledge agreement, mortgage
          or guaranty; (c) management, construction supervision, service or
          employment agreements, conditional sales contracts or leases of real
          or personal property, which involve expenditures in excess of $50,000
          in any single 

                                      -8-
<PAGE>
 
          case; (d) collective bargaining agreements; (e) contracts or
          commitments for the future purchase or sale of goods by either
          Borrower, other than those which involve the payment or receipt of
          less than $50,000 in any single case; (f) contracts or commitments
          which involve a Capital Expenditure in excess of $50,000 in any single
          case; (g) bonus, pension, retirement, insurance or other employee
          benefit plans; (h) all Licenses and (i) all Land Lease Agreements. All
          of the agreements, contracts and commitments listed on Exhibit I 
                                                                 ---------
          attached to the First Amendment are in full force and effect without
          material default. Such Exhibit I further identifies each such contract
                                 --------- 
          which requires consent to the granting of a Lien in favor of the
          Agent, for the benefit of the Banks, on the rights of the Borrowers
          under such contract. The Borrowers have made available to the Agent
          true and complete copies of all of the agreements, contracts and
          commitments listed on such Exhibit I.
                                     --------- 

                 5.16  Employee Benefit Plans.  Exhibit J attached to the First
                       ----------------------   ---------                      
          Amendment contains a true and complete list of all Plans maintained by
          either Borrower or any member of the Controlled Group.  Neither a
          Borrower nor any member of the Controlled Group has or will have, as
          of the closing under the Purchase Agreement, any liability, or
          reasonably anticipates any liability, of any kind in excess, in the
          aggregate, of $50,000, to or in respect of any Plan or Benefit
          Arrangement.  With respect to the Plans and Benefit Arrangements
          maintained by a Borrower or any member of the Controlled Group: (a)
          each Plan that is intended to be qualified under Code Section 401(a)
          is so qualified and has been so qualified since its adoption, and each
          trust forming a part thereof is exempt from tax under Code Section
          501(a); (b) each Plan complies in all material respects with all
          applicable requirements of law, has been administered in accordance
          with its terms and all required contributions have been made; (c)
          neither a Borrower nor any member of the Controlled Group knows or has
          reason to know that either Borrower or any member of the Controlled
          Group has engaged in a transaction which would subject it to any tax,
          penalty or liability under ERISA or the Code for any prohibited
          transaction; (d) no Plan is subject to the minimum funding
          requirements under ERISA Section 302 or Code Section 412, is a
          multiemployer plan (as defined in ERISA Section 4001(a)(3)), is a
          defined benefit plan (as defined under ERISA Section 3(35) or Code
          Section 

                                      -9-
<PAGE>
 
          414(j)), or is a multiple employer plan (as defined in ERISA Section
          4063). No Plan or Benefit Arrangement maintained by a Borrower or any
          member of the Controlled Group is a multiple employer welfare
          arrangement (as defined in ERISA Section 3(40)).

                5.17  Licenses.  The Licenses shown on Exhibit I attached to the
                      --------                         ---------                
          First Amendment constitute all of the Licenses which are necessary for
          the lawful operation of the business of the Borrowers (after giving
          effect to the closings under the Purchase Agreement and the Motorola
          Purchase Agreement) in the manner and to the full extent they are
          currently operated.  Such Exhibit I sets forth a correct and complete
                                    ---------                                  
          list of each pending application for a License filed by either
          Borrower.  All of the FAA Licenses have been duly and validly issued
          to and are legally held by the Borrowers and are in full force and
          effect without condition except those of general application.  The
          Licenses have been issued in compliance with all applicable laws and
          regulations, are legally binding and enforceable in accordance with
          their terms and are in good standing. The Borrowers know of no facts
          or conditions which would constitute grounds for any Licensing
          Authority to deny any pending material application for a License, to
          suspend, revoke, materially adversely modify or annul any License or
          to impose a material financial penalty on either Borrower.

                5.18  Material Restrictions.  Neither Borrower is a party to any
                      ---------------------                                     
          agreement or other instrument or subject to any other restriction
          which materially and adversely affects or could materially and
          adversely affect its business, property, assets, operations or
          condition, financial or otherwise.

                5.19  Investment Company Act.  Neither Borrower (a) is an
                      ----------------------                             
          investment company as that term is defined in the Investment Company
          Act of 1940, as amended, (b) directly or indirectly controls, and is
          not directly or indirectly controlled by a company which is an
          investment company as that term is defined in such act or (c) is
          otherwise subject to regulation under such act.

                5.20  Absence of Material Adverse Changes.  No Material Adverse
                      -----------------------------------                      
          Effect has occurred.

                                      -10-
<PAGE>
 
                5.21  Defaults.  No Possible Default or Event of Default now
                      --------                                              
          exists or will exist upon the making of any Loan.

                5.22  Real Property.  Exhibit K attached to the First Amendment
                      -------------   ---------                                
          lists as of the effective date of the First Amendment (a) all real
          estate owned by either Borrower or which CTC-PR will acquire pursuant
          to the Motorola Purchase Agreement and all leases, permits and
          licenses pursuant to which either Borrower has acquired or will
          acquire pursuant to the Motorola Purchase Agreement a leasehold,
          license or other interest in real estate, (b) all such leases that
          have been recorded in the real property records of any jurisdiction,
          (c) all such owned and leased property for which either Borrower has
          obtained title insurance or a commitment for title insurance and (d)
          the use of such property in such Borrower's operations and the
          Borrowers' good faith estimate of the fair market value of each such
          owned parcel.

                5.23  Securities Laws.  No proceeds of any Loan will be used by
                      ---------------                                          
          either Borrower to acquire any security in any transaction which is
          subject to Section 13 or 14 of the Securities Exchange Act of 1934, as
          amended. Neither the registration of any security under the Securities
          Act of 1933, as amended, or the securities laws of any state, nor the
          qualification of an indenture in respect thereof under the Trust
          Indenture Act of 1939, as amended, is required in connection with the
          consummation of this Agreement, the Purchase Agreement or the Motorola
          Purchase Agreement.

                5.24  Insurance.  All policies of insurance of any kind or
                      ---------                                           
          nature owned by or issued to either Borrower, including, without
          limitation, policies of fire, theft, public liability, property
          damage, other casualty, employee fidelity, worker's compensation,
          employee health and welfare, title, property and liability insurance,
          are in full force and effect and are of a nature and provide such
          coverage as is sufficient and as is customarily carried by companies
          of the size and character of the Borrowers and engaged in a similar
          business.  In the past three years, neither Borrower has been refused
          insurance for which it applied or had any policy of insurance
          terminated (other than at its request).

                5.25  Labor Disputes.  There are no strikes or other material
                      --------------                                         
          labor disputes or grievances pending 

                                      -11-
<PAGE>
 
          against either Borrower. To the best knowledge of the Borrowers, there
          are no such strikes and no such disputes threatened which could
          reasonably be expected to have a Material Adverse Effect. There are no
          material unfair labor practice charges or grievances pending or in
          process or, to the best knowledge of the Borrowers, threatened by or
          on behalf of any employee or group of employees of either Borrower.
          Neither Borrower has received any written complaints, and neither
          Borrower has any knowledge of any threatened complaints, nor to the
          best of the Borrowers' knowledge are any such complaints on file with
          any Federal, state or local governmental agency, alleging employment
          discrimination by either Borrower. All payments due from either
          Borrower pursuant to the provisions of any collective bargaining
          agreement have been paid or accrued as a liability on the books of
          such Borrower.

                5.26  Environmental Compliance.
                      ------------------------ 

                      (a)  Each Borrower has obtained all material permits,
          licenses and other authorizations which are required under all
          Environmental Laws.  Each Borrower is in material compliance with all
          terms and conditions of all such permits, licenses and authorizations,
          and is also in material compliance with all other limitations,
          restrictions, conditions, standards, prohibitions, requirements,
          obligations, schedules and timetables contained in any applicable
          Environmental Law or in any regulation, code, plan, order, decree,
          judgment, injunction, notice or demand letter issued, entered,
          promulgated or approved thereunder, including, without limitation, all
          Environmental Laws in all jurisdictions in which such Borrower owns,
          maintains or manages a Tower, a facility or site, arranges or has
          arranged for disposal or treatment of Hazardous Materials, solid waste
          or other wastes, accepts or has accepted for transport any Hazardous
          Materials, solid waste or other wastes or holds or has held any
          interest in real property or otherwise.

                      (b)  No Environmental Claim has been issued, no complaint
          has been filed, no penalty has been assessed and no litigation,
          proceeding, investigation or review is pending or, to the best of the
          Borrowers' knowledge, threatened by any Person with respect to any
          alleged failure by either Borrower to comply with any Environmental
          Law or to have any permit, license or authorization required in
          connection with the conduct of the business of such Borrower or with
          respect to any 

                                      -12-
<PAGE>
 
          generation, treatment, storage, recycling, transportation, use,
          disposal or Release of any Hazardous Materials generated by such
          Borrower or with respect to any real property in which such Borrower
          holds or has held an interest or any past or present operation of such
          Borrower.

                      (c)  Except as set forth on Exhibit L, there are no
                                                  ---------              
          Environmental Laws requiring any material work, repairs, construction,
          Capital Expenditures or other remedial work of any nature whatsoever,
          with respect to any real property in which either Borrower holds or
          has held an interest or any past or present operation of such
          Borrower.

                      (d)  To the best of the Borrowers' knowledge, except as
          set forth on Exhibit L, neither Borrower has handled any Hazardous
                       ---------                                            
          Material on any property now or previously owned or leased by either
          Borrower to an extent that it has, or could reasonably be expected to
          have, a Material Adverse Effect; and to the best of the Borrowers'
          knowledge, except as could not reasonably be expected to have a
          Material Adverse Effect:

                           (i)    no PCBs are present at any property now or
          previously owned or any premises now or previously leased by either
          Borrower;

                           (ii)   no asbestos is present at any property now or
          previously owned or any premises now or previously leased by either
          Borrower;

                           (iii)  no underground storage tanks for Hazardous
          Materials, active or abandoned, are now or were previously operated at
          any property now or previously owned by either Borrower, and, with
          respect to premises now or previously leased by either Borrower, no
          underground storage tanks for Hazardous Materials, active or
          abandoned, are now or were previously operated by either Borrower;

                           (iv)   no Hazardous Materials have been Released, in
          a reportable quantity, where such a quantity has been established by
          statute, ordinance, rule, regulation or order, at, on or under any
          property now or previously owned by either Borrower; and

                           (v)    no Hazardous Materials have been otherwise
          Released at, on or under any property now or 

                                      -13-
<PAGE>
 
          previously owned or any premises now or previously leased by either
          Borrower.

                      (e)  Neither Borrower has transported or arranged for the
          transportation of any material amount of Hazardous Material to any
          location that is listed on the National Priorities List ("NPL") under
          the Comprehensive Environmental Response, Compensation and Liability
          Act of 1980, as amended ("CERCLA"), listed for possible inclusion on
          the NPL by the Environmental Protection Agency in the Comprehensive
          Environmental Response and Liability Information System, as provided
          for by 40 C.F.R. (S)300.5 ("CERCLIS"), or on any similar state or
          local list or that is the subject of Federal, state or local
          enforcement actions or other investigations that may lead to any
          material Environmental Claims against either Borrower.

                      (f)  No material amount of Hazardous Material generated by
          either Borrower has been recycled, treated, stored, disposed of or
          Released by either Borrower at any location.

                      (g)  Except as set forth on Exhibit L, no oral or written
                                                  ---------                    
          notification of a Release of any material amount of a Hazardous
          Material has been filed by or on behalf of either Borrower and no
          property now, or, to the best of the Borrowers' knowledge, previously,
          owned or leased by either Borrower is listed or proposed for listing
          on NPL or on any similar state list of sites requiring investigation
          or clean-up.

                      (h)  There are no Liens arising under or pursuant to any
          Environmental Laws on any of the property owned or premises leased by
          either Borrower, and no government actions have been taken or are in
          process which could subject any of such property to such Liens, and
          neither Borrower would be required to place any notice or restriction
          relating to the presence of Hazardous Materials at any property owned
          by it in any deed to such property.

                      (i)  Except as set forth on Exhibit L, neither Borrower
                                                  ---------
          has retained or assumed any liabilities (contingent or otherwise) in
          respect of any Environmental Claims (i) under the terms of any
          contract or agreement or (ii) by operation of law as a result of
          merger, consolidation or the sale, exchange or contribution of assets
          or stock.

                                      -14-
<PAGE>
 
                      (j)  There have been no environmental investigations,
          studies, audits, tests, reviews or other analyses conducted by or
          which are in the possession of either Borrower in relation to any
          property or facility now or previously owned or leased by such
          Borrower which have not been disclosed in writing and made available
          to the Banks.

                5.27  Solvency.  Each Borrower has received, or has the right
                      --------                                               
          hereunder to receive, consideration which is the reasonable equivalent
          value of the obligations and liabilities that such Borrower has
          incurred to the Banks.  Neither Borrower is insolvent as defined in
          Section 101 of Title 11 of the United States Code or any applicable
          state insolvency statute, nor, after giving effect to the consummation
          of the transactions contemplated herein, will either Borrower be
          rendered insolvent by the execution and delivery of this Agreement,
          the Notes or the Collateral Documents to the Banks or the consummation
          of the Purchase Agreement or the Motorola Purchase Agreement.  Neither
          Borrower is engaged, or is about to engage, in any business or
          transaction for which the assets retained by it shall be an
          unreasonably small capital, taking into consideration the obligations
          to the Banks incurred hereunder.  Neither Borrower intends to, and
          neither Borrower believes that it will, incur debts beyond its ability
          to pay them as they mature.

                5.28  Purchase Agreement and Motorola Purchase Agreement.  The
                      --------------------------------------------------      
          Borrowers have provided to the Agent a complete and correct copy of
          the Purchase Agreement and of the Motorola Purchase Agreement,
          together with all exhibits thereto.  To the best of the Borrowers'
          knowledge, all of the representations and warranties of the Motorola
          Sellers in the Motorola Purchase Agreement are true and correct in all
          material respects as of the date of the First Amendment as if given as
          of such date.  No party to either the Purchase Agreement or the
          Motorola Purchase Agreement has given notice of any breach of its
          representations or agreements therein. All of the representations and
          warranties of the Borrowers in this Section 5 shall be deemed to be
          given as of the moment following consummation of the closing under the
          Motorola Purchase Agreement, and the Towers being acquired pursuant to
          the Purchase Agreement and the Motorola Purchase Agreement shall be
          deemed to be Towers for all purposes of these representations and
          warranties.

                                      -15-
<PAGE>
 
               (c)  The text of Exhibits A, B, C, D, E, F, G, H, I, J and
K to the Original Agreement shall be deleted and replaced with the text of
Exhibits A, B, C, D, E, F, G, H, I, J and K attached to this Amendment.

          3.  Consent.  Subject to the satisfaction of the conditions set forth
              -------                                                          
in Section 4, the Agent and the Banks hereby consent to the acquisition by CTC-
PR pursuant to the Motorola Purchase Agreement.  However, CTC-PR shall either
sell the SMR Business and the SMR Assets, as those terms are defined in the
Motorola Purchase Agreement, within four months of the date hereof or obtain a
capital contribution from Holdco, in an amount equal to $1,075,000 pursuant to
agreements, documents and instruments in form and substance acceptable to the
Agent.  All of the net sales proceeds of such sale or all of such capital
contribution, as the case may be, shall be paid to the Banks as a mandatory
prepayment pursuant to Section 2.7(b) of the Loan Agreement.

          4.  Conditions to Effectiveness.  The amendments set forth in Section
              ---------------------------                                      
2 and the consent set forth in Section 3 shall be effective upon satisfaction of
all of the following conditions:

               (a)  Each Borrower shall have delivered to the Agent a certified
copy of resolutions of its Board of Directors evidencing approval of the
execution, delivery and performance of this Amendment, the Amended Notes, the
Motorola Purchase Agreement, and the other amendments, agreements, documents and
instruments required pursuant hereto.

               (b)  The Borrowers shall have executed and delivered to the Banks
Amended and Restated Revolving Credit Notes in the form attached hereto as
                                                                          
Exhibit A (the "Amended Reducing Notes"), Amended and Restated Working Capital
- ---------                                                                     
Notes in the form attached hereto as Exhibit B (the "Amended Working Capital
                                     ---------                              
Notes"), and Amended and Restated Term Notes in the form attached hereto as
                                                                           
Exhibit C (the "Amended Term Notes" and, together with the Amended Reducing
- ---------                                                                  
Notes and the Amended Working Capital Notes, collectively, the "Amended Notes"
and individually, an "Amended Note").

               (c)  The Borrowers shall have delivered to the Agent (i) a duly
executed amendment, in form and substance satisfactory to the Agent, to the
Security Agreement entered into pursuant to the Original Agreement, pursuant to
which CTC-PR is added as a Debtor thereunder and grants to the Agent, for the
benefit of the Banks security interests in substantially all of its assets, and
(ii) agreements and documents in form and substance satisfactory to the Agent
granting to the Agent, for 

                                      -16-
<PAGE>
 
the benefit of the Banks, perfected, first priority liens and security interest
in substantially all of the real and personal property of the Borrowers located
in Puerto Rico.

               (d)  CTC-Del shall have executed and delivered to the Agent a
pledge agreement in form and substance satisfactory to the Agent, granting to
the Agent, for the benefit of the Banks, a perfected, first priority security
interest in all of the issued and outstanding shares of capital stock of CTC-PR,
and CTC-Del shall have delivered to the Agent stock certificates evidencing all
of such shares and duly executed blank stock powers in respect thereof and shall
have taken all other actions as may be required to effect the grant and
perfection of the Agent's security interest in such stock.

               (e)  Holdco shall have executed and delivered to the Agent (i) an
amendment, in form and substance satisfactory to the Agent, to the Guaranty
executed and delivered to the Agent pursuant to the Original Agreement pursuant
to which Holdco guarantees all of the Borrowers' Obligations under the Loan
Agreement, under the Notes and under each Collateral Document, (ii) an
amendment, in form and substance satisfactory to the Agent, to the Borrower
Pledge Agreement entered into pursuant to the Original Agreement, and (iii) a
new pledge agreement in form and substance satisfactory to the Agent, granting
to the Agent, for the benefit of the Banks, a perfected, first priority security
interest in all of the issued and outstanding shares of capital stock of
Spectrum Site Management Corporation, and Holdco shall have delivered to the
Agent stock certificates evidencing all of such shares and duly executed blank
stock powers in respect thereof and shall have taken all other actions as may be
required to effect the grant and perfection of the Agent's security interest in
such stock.

               (f)  Spectrum Site Management Corporation shall have executed and
delivered to the Agent (i) a guarantee in form and substance satisfactory to the
Agent guaranteeing all of the Obligations of the Borrowers and (ii) a Security
Agreement, in form and substance satisfactory to the Agent, granting to the
Agent, for the benefit of the Banks, a perfected, first priority security
interest in substantially all of its personal property, and such Security
Agreement, and the security interests granted pursuant thereto, shall be in full
force and effect.

               (g)  Centennial Fund IV, L.P. shall have executed and delivered
to the Agent amendments in form and substance satisfactory to the Agent to the
Stockholder Pledge Agreement and the Stockholder Subordination Agreement entered
into pursuant to the Original Agreement.

                                      -17-
<PAGE>
 
               (h)  The Borrowers shall have taken all actions required pursuant
to Section 8.10(b) of the Loan Agreement in respect of the acquisition
contemplated by the Motorola Purchase Agreement.

               (i)  The Borrowers shall have taken all actions required pursuant
to Section 6 of the Loan Agreement in respect of any Reducing Loans to be made
by the Banks in connection with the acquisition contemplated by the Motorola
Purchase Agreement.

               (j)  The Borrowers shall have delivered to the Agent the
following:

                    (i)    certificates of good standing for CTC-Del from the
Secretary of State of each of the States of Delaware and Texas, and a
certificate of good standing for CTC-PR from the Secretary of the Commonwealth
of Puerto Rico, in each case dated as of a date as near to the Closing Date as
practicable;

                    (ii)   a certificate signed by the Secretary or Assistant
Secretary of each Borrower certifying that attached thereto are true and
complete copies of (A) the Certificate of Incorporation and By-Laws of each
Borrower, (B) the Motorola Purchase Agreement, and (C) resolutions adopted by
the respective Boards of Directors of each Borrower and of Holdco authorizing
the execution, delivery and performance by the Borrowers and Holdco of the
Motorola Purchase Agreement, this Amendment, the Amended Notes and the other
agreements, documents and instruments to be executed and delivered pursuant
hereto to which it is a party;

                    (iii)  an incumbency certificate for each Borrower; and

                    (iv)   such other documents as any Bank may reasonably
request in connection with the proceedings taken by either Borrower or Holdco
authorizing this Amendment, the Amended Notes or the other Collateral Documents
and the transactions contemplated hereby, to the extent it is a party thereto.

               (k)  The Borrowers shall have paid to the Agent and the Banks all
commitment fees accrued under the Original Agreement.

               (l)  The transactions contemplated by the Motorola Purchase
Agreement shall have been consummated, or shall be consummated simultaneously
with the making of new Reducing Loans without the waiver of any material term or
condition by any party thereto. Without limiting the foregoing sentence, CTC-PR
shall have purchased from the Motorola Sellers substantially all of the 

                                      -18-
<PAGE>
 
Tower Assets, SMR Assets and Microwave Assets, as those terms are defined in the
Motorola Purchase Agreement, free and clear of all Liens, except Permitted
Liens. The consummation of the transactions contemplated by the Motorola
Purchase Agreement shall be completed in a manner satisfactory to the Agent, and
the Agent shall have received conformed copies or photocopies of all documents
relating thereto.

               (m)  The Borrowers shall have satisfied the requirements of
Section 6.4 of the Original Agreement with respect to any real estate interests
to be acquired pursuant to the Motorola Purchase Agreement to the extent
reasonably requested by the Agent.

               (n)  The Borrowers shall have delivered to the Agent (i) lien
searches in all applicable jurisdictions with respect to all property to be
acquired pursuant to the Motorola Purchase Agreement, (ii) consents to the
granting of Liens in all material leases, Licenses and other material contracts
and leases being acquired pursuant to the Motorola Purchase Agreement which by
their terms require such consent, and (iii) releases of any existing Liens
encumbering any of such material leases, Licenses and other material contracts
and leases being acquired pursuant to the Motorola Purchase Agreement, except
for Permitted Liens.

               (o)  There shall have been no changes in the business,
properties, operations, prospects or condition, financial or otherwise, of
either Borrower since December 31, 1995, which are individually or in the
aggregate materially adverse.

               (p)  The Borrowers shall have delivered to the Agent opinions in
form and substance satisfactory to the Agent from the general counsel, FCC
counsel and local Texas and Puerto Rico counsel of the Borrowers.

               (q)  CTC-PR shall have delivered to the Agent certificates of
insurance or other satisfactory evidence that the insurance required by Section
7.3 of the Loan Agreement is in full force and effect.

               (r)  The Borrowers shall have delivered to the Bank a
certificate, dated as of the closing of the Motorola Purchase Agreement,
certifying as to their compliance with the terms of the Loan Agreement after
giving pro forma effect to the acquisition under the Motorola Purchase
Agreement, the accuracy of the representations and warranties of the Borrowers
in the Loan Agreement, as amended hereby, this Amendment and the other
Collateral Documents, and such other documents, instruments and opinions as any
Bank may reasonably request.

                                      -19-
<PAGE>
 
          5.  Representations, Warranties and Events of Default.
              ------------------------------------------------- 

               (a)  Except as amended hereby, the terms, provisions, conditions
and agreements of the Original Agreement are hereby ratified and confirmed and
shall remain in full force and effect. Each and every representation and
warranty of the Borrowers set forth in the Original Agreement, as amended
hereby, other than those which by their terms are limited to a specific date, is
hereby confirmed and ratified in all material respects and such representations
and warranties as so confirmed and ratified shall be deemed to have been made
and undertaken as of the date of this Amendment as well as at the time they were
made and undertaken.

               (b)  The Borrowers, jointly and severally, represent and warrant
that:

                    (i)    No Event of Default or Possible Default now exists or
will exist immediately following the execution hereof or after giving effect to
the transactions contemplated hereby, including the consummation of the purchase
pursuant to the Motorola Purchase Agreement.

                    (ii)   All necessary corporate or shareholder actions on the
part of each Borrower, Holdco and each stockholder of Holdco to authorize the
execution, delivery and performance of this Amendment, the Amended Notes, the
Motorola Purchase Agreement, and all other amendments, agreements, documents or
instruments required pursuant hereto or thereto have been taken; this Amendment,
the Amended Notes, the Motorola Purchase Agreement and each such other
amendment, agreement, document or instrument have been duly and validly executed
and delivered and are legally valid and binding upon each Borrower that is a
party thereto and enforceable in accordance with their respective terms, except
to the extent that the enforceability thereof may be limited by bankruptcy,
insolvency or like laws or by general equitable principles.

                    (iii)  The execution, delivery and performance of this
Amendment, the Amended Notes, the Motorola Purchase Agreement and all other
amendments, agreements, documents and instruments required pursuant hereto or
thereto, and all actions and transactions contemplated hereby and thereby will
not (A) violate, be in conflict with, result in a breach of or constitute (with
due notice or lapse of time or both) a default under (I) any provision of the
charter documents or by-laws of either Borrower, (II) any arbitration award or
any order of any court or of any other governmental agency or authority, (III)
any license, permit or authorization granted to either Borrower or under which
either Borrower operates, or (IV) any 

                                      -20-
<PAGE>
 
applicable law, rule, order or regulation, indenture, agreement or other
instrument to which either Borrower is a party or by which either Borrower or
any of its properties is bound and which has not been waived or consented to, or
(B) result in the creation or imposition of any lien, charge or encumbrance of
any nature whatsoever, except as expressly permitted in the Loan Agreement, upon
any of the properties of either Borrower.

                    (iv)   No consent, approval or authorization of, or filing,
registration or qualification with, any governmental authority (including,
without limitation, the FCC and any other Licensing Authority) is required to be
obtained by either Borrower or Holdco in connection with the execution, delivery
or performance of this Amendment, the Amended Notes, the Motorola Purchase
Agreement or any amendment, agreement, document or instrument required in
connection herewith or therewith which has not already been obtained or
completed.

          6.  Affirmation of the Borrowers.  The Borrowers acknowledge that the
              ----------------------------                                     
security interests and liens granted by the Borrowers to the Agent, for the
benefit of the Banks, pursuant to the Security Agreement, the Mortgages and the
other Collateral Documents, as amended pursuant hereto, remain in full force and
effect and shall continue to secure all Obligations of the Borrowers.

          7.  Fees and Expenses.  As required under the Original Agreement, the
              -----------------                                                
Borrowers, jointly and severally, will reimburse the Agent upon demand for all
out-of-pocket costs, charges and expenses of the Agent (including fees and
disbursements of special counsel to the Agent and local counsel to the Agent in
Puerto Rico) in connection with the preparation, negotiation, execution and
delivery of this Amendment and the other agreements or documents relating hereto
or required hereby.

          8.  Counterparts.  This Amendment may be executed in as many
              ------------                                            
counterparts as may be convenient and shall become binding when each Borrower,
the Agent and the Banks have executed at least one counterpart.

          9.  Governing Law.  This Amendment shall be a contract made under and
              -------------                                                    
governed by the laws of the State of Ohio, without regard to the conflicts of
law provisions thereof.

          10.  Binding Effect.  This Amendment shall be binding upon and shall
               --------------                                                 
inure to the benefit of the Borrowers, the Agent and the Banks and their
respective successors and assigns.

          11.  Reference to Original Agreement.  Except as amended hereby, the
               -------------------------------                                
Original Agreement shall remain in full force 

                                      -21-
<PAGE>
 
and effect and is hereby ratified and confirmed in all respects. On and after
the effectiveness of the amendments to the Original Agreement accomplished
hereby, each reference in the Original Agreement to "this Agreement",
"hereunder", "hereof", "herein" or words of like import, and each reference to
the Original Agreement or the original notes issued pursuant thereto in any Note
or other Collateral Document, or other agreement, document or instrument
executed and delivered pursuant to the Original Agreement, shall be deemed a
reference to the Original Agreement, as amended hereby, or the Amended Notes, as
the case may be.

                                      -22-
<PAGE>
 
          IN WITNESS WHEREOF, the parties have executed this First Amendment to
Loan Agreement as of the date first above written.

BORROWERS:

CASTLE TOWER CORPORATION



By: /s/ EDWARD C. HUTCHESON, JR.
   -----------------------------
Name: Edward C. Hutcheson, Jr.
     ---------------------------
Title: President
      --------------------------

CASTLE TOWER CORPORATION (PR)



By: /s/ EDWARD C. HUTCHESON, JR.
   -----------------------------
Name: Edward C. Hutcheson, Jr.
     ---------------------------
Title: President 
      --------------------------

BANKS:

KEYBANK NATIONAL ASSOCIATION



By: /s/ JASON R. WEAVER
   -----------------------------
   Jason R. Weaver
   Assistant Vice President

WELLS FARGO BANK (TEXAS),
NATIONAL ASSOCIATION



By: /s/ BENNETT D. DOUGLAS
   -----------------------------
   Bennett D. Douglas
   Vice President

AGENT:

KEYBANK NATIONAL ASSOCIATION



By: /s/ JASON R. WEAVER
   -----------------------------
   Jason R. Weaver
   Assistant Vice President

                                      -23-
<PAGE>
 
                                LIST OF EXHIBITS
                                ----------------

Exhibit A                     Form of Amended and Restated Reducing Note

Exhibit B                     Form of Amended and Restated Working Capital Note

Exhibit C                     Form of Amended and Restated Term Note

Exhibit D                     Financial Statements

Exhibit E                     Projections

Exhibit F                     Capitalization

Exhibit G                     Proceedings, Litigation and Non-Compliance with
                              Law

Exhibit H                     Liens and Indebtedness

Exhibit I                     List of Contracts, Commitments and Licenses

Exhibit J                     ERISA Liabilities and Plans

Exhibit K                     Real Property List

Exhibit L                     Environmental Compliance

                                      -24-

<PAGE>
 
                                                                    Exhibit 10.4

                       SECOND AMENDMENT TO LOAN AGREEMENT


          This SECOND AMENDMENT TO LOAN AGREEMENT is made and entered into as of
January 17, 1997, by and among CASTLE TOWER CORPORATION, a Delaware corporation
("CTC-Del"), CASTLE TOWER CORPORATION (PR), a Puerto Rico corporation ("CTC-PR"
and, together with CTC-Del, collectively, the "Borrowers" and individually, a
"Borrower"), the FINANCIAL INSTITUTIONS listed on the signature pages hereof,
and KEYBANK NATIONAL ASSOCIATION (formerly known as "Society National Bank"), as
agent (the "Agent").

                                    RECITALS
                                    --------

          A.   CTC-Del, CTC-PR, the Agent and the Banks entered into a Loan
Agreement dated as of April 26, 1995 (as amended by the First Amendment to Loan
Agreement dated as of June 26, 1996, the "Original Agreement"), pursuant to
which the Banks agreed to make available to the Borrowers loans of up to
$25,000,000.  The Original Agreement, as amended hereby, may be referred to
hereinafter as the "Loan Agreement."  Capitalized terms used herein and not
otherwise defined shall have the meanings assigned to them in the Loan
Agreement.

          B.   The Borrowers desire to increase the amount of the Reducing
Commitment to $49,000,000, to revise the amortization schedules, to revise
certain of the financial covenants and to make certain other changes in the
Original Agreement.  Subject to the terms and conditions of this Amendment, the
Agent and the Banks have agreed to such requests.


                                   AGREEMENTS
                                   ----------

          In consideration of the foregoing Recitals and of the covenants and
representations contained herein, and for other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the Borrowers, the
Agent and the Banks agree as follows:

          1.   Amendments.  Subject to the satisfaction of the conditions set
               ----------                                                    
forth in Section 3 of this Amendment, the Original Agreement shall be amended as
follows:

               (a) Section 1.1 shall be amended by adding thereto the following
new definitions in the proper alphabetical order:


               "Adjusted Leverage Ratio" means, as of any date of determination,
                -----------------------                                         
          the ratio of Adjusted Total Debt as of 
<PAGE>
 
          such date to Operating Cash Flow for the four quarter period then
          ended or most recently ended.

               "Adjusted Total Debt" means, as of any date, Total Debt
                -------------------                                   
          outstanding as of such date minus an amount equal to 80% of the sum,
                                      -----                                   
          as of such date, of all cash, currency and credit balances of the
          Borrowers and their Subsidiaries in any demand, time, savings,
          passbook or like account with a bank, savings and loan association,
          credit union or like organization, other than an account evidenced by
          a negotiable certificate of deposit; provided that accounts evidenced
                                               --------                        
          by negotiable certificates of deposit issued by any Bank shall be
          included in such sum.

               "Interest Expense" means, for any period, the gross interest
                ----------------                                           
          expense accrued by the Borrowers and their Subsidiaries in respect of
          their Indebtedness for such period, determined on a consolidated
          basis, all fees payable under Section 2.6 or the Fee Letter referred
          to in the Second Amendment and any other fees, charges, commissions
          and discounts in respect of Indebtedness, including fees payable in
          connection with the Letters of Credit.  For purposes of the foregoing,
          gross interest expense shall be determined after giving effect to any
          net payments made or received by the Borrowers with respect to Rate
          Hedging Obligations.

               "Second Amendment" means the Second Amendment to Loan Agreement
                ----------------                                              
          dated as of January 17, 1997, among the Borrowers, the Agent and the
          Banks.

               (b) The definition of the term "Applicable Margin" in Section 1.1
shall be amended in its entirety to read as follows:

               "Applicable Margin" means, as of any date of determination, the
                -----------------                                             
          percentage determined from the following table based upon the Adjusted
          Leverage Ratio:
<TABLE>
<CAPTION>
 
          Adjusted              Applicable         Applicable
          Leverage              Margin for         Margin for
          Ratio:                Base Rate Loans:   LIBOR Loans:
          -----                 ---------------    -----------
         <S>                    <C>                <C>
          Greater than          1.50%              3.00%
          5.00:1.0 but less                     
          than or equal to                      
          5.50:1.0                              
</TABLE> 


                                      -2-
<PAGE>
 
<TABLE> 
          <S>                         <C>              <C> 
          Greater than                1.25%            2.75%
          4.50:1.0 but less                     
          than or equal to                      
          5:00:1.0                              

          Greater than                1.00%            2.50%
          4.00:1.0 but less                     
          than or equal to                      
          4.50:1.0                              

          Greater than                 .75%            2.25%
          3.50:1.0 but less                     
          than or equal to                      
          4:00:1.0                              

          Greater than                 .50%            2.00%
          3.00:1.0 but less                     
          than or equal to                      
          3.50:1.0                              

          Less than or equal           .25%            1.75%
          to 3.0:1.0
</TABLE>

               (c) The definition of the term "Debt Service" in Section 1.1
shall be amended by deleting the word "Borrower" on the sixth line thereof and
in its place inserting the words "Borrowers and their Subsidiaries."

               (d) The definition of the term "Default Interest Rate" in Section
1.1 shall be amended in its entirety to read as follows:

               "Default Interest Rate" means, as of any date, a rate of interest
                ---------------------                                           
          equal to the Base Rate plus 5.5% per annum.

               (e) The definition of the term "Excess Cash Flow" in Section 1.1
shall be amended by deleting clause (e) thereof and in its place inserting the
following clause:

               (e) the excess, if any, in Working Capital of the Borrowers and
          their Subsidiaries as of the end of such fiscal year over the Working
          Capital of the Borrowers and their Subsidiaries as of the end of the
          prior fiscal year.

               (f) The definition of the term "Historical Fixed Charges" in
Section 1.1 shall be amended by deleting the word "Borrower" in each place it
appears therein and in its place inserting the words "Borrowers or their
Subsidiaries".

                                      -3-
<PAGE>
 
               (g) The definition of "Material Adverse Effect" in Section 1.1
shall be amended by deleting the word "Borrower" in each place it appears
therein, and in its place inserting the words "Borrowers or any of their
Subsidiaries."

               (h) The definition of "Net Earnings" in Section 1.1 shall be
amended by deleting the word Borrower in the second line thereof and in its
place inserting the words "Borrowers and their Subsidiaries".

               (i) The definition of the term "Operating Cash Flow" in Section
1.1 shall be amended in its entirety to read as follows:

               "Operating Cash Flow" means, during any period, Net Earnings for
                -------------------                                            
          such period (excluding, to the extent included in Net Earnings, any
          Extraordinary Items and the effect of any exchange of space on a Tower
          for non-cash consideration, such as merchandise or services), minus
                                                                        -----
          the sum of any interest and other investment income during such
          period, plus the sum of, without duplication, (a) depreciation on or
                  ----                                                        
          obsolescence of fixed or capital assets and amortization of
          intangibles and leasehold improvements for such period, plus (b) any
                                                                  ----        
          amounts paid by the Borrowers in such period in respect of Rate
          Hedging Obligations to the extent such amounts were deducted in
          calculating Net Earnings, plus (c) cash interest accrued and paid
                                    ----                                   
          during such period, plus (d) federal and state income taxes accrued
                              ----                                           
          and paid during such period (exclusive of any such taxes resulting
          from any Extraordinary Items), plus (e) non-recurring costs paid in
                                         ----                                
          such period in connection with the Purchase Agreement or Qualified
          Acquisitions and approved by the Agent, to the extent that such costs
          were paid from equity contributions or the proceeds of any Loan.  The
          calculation of Operating Cash Flow shall be subject to the following
          adjustments:

               (i)  For purposes of calculating Operating Cash Flow for any
          quarter ending on or prior to December 31, 1998, an amount equal to
          Corporate Development Expense actually accrued and paid during such
          quarter shall be added back to Net Earnings (to the extent deducted in
          calculating Net Earnings); provided, however, that (A) no more than an
                                     --------  -------                          
          amount equal to $750,000 of Corporate Development Expense may be added
          back to Net Earnings in any quarter; (B) no amount of Corporate
          Development Expense shall be added back to Net Earnings for any
          quarter ending after December 31, 1998; and (C) in no event shall more
          than an aggregate amount of $1,500,000 

                                      -4-
<PAGE>
 
          of Corporate Development Expense be added back to Net Earnings for
          either of the four quarter periods ending December 31, 1997, or
          December 31, 1998, or more than an aggregate amount of $3,000,000 of
          Corporate Development Expense be added back to Net Earnings for the
          eight quarter period ending December 31, 1998, except, in either such
          case, to the extent Holdco shall have made a cash capital contribution
          to CTC-Del after the date of the Second Amendment in the amount of
          such excess and expressly designated for the payment of Corporate
          Development Expense; and

               (ii)  For purposes of calculating Operating Cash Flow for any
          period, the acquisition pursuant to the Purchase Agreement, each other
          Qualified Acquisition and each sale or other disposition by the
          Borrowers of any Towers and related assets, whether by sale of stock
          or assets, which occurs during such period, shall be deemed to have
          occurred on the first day of such period; accordingly, the operating
          cash flow received by the seller of the Towers and related assets, or
          of a management agreement in respect thereof, acquired pursuant to the
          Purchase Agreement and each Qualified Acquisition shall be included
          for the entire period and the Operating Cash Flow relating to any
          Towers and related assets, or of a management agreement in respect
          thereof, sold or otherwise disposed of during such period shall be
          excluded from the calculation of Operating Cash Flow for the entire
          period.

               (j) The definition of the term "Pledge Agreements" in Section 1.1
shall be amended in its entirety to read as follows:

               "Pledge Agreements" means the Holdco Pledge Agreement, the
                -----------------                                        
          Stockholder Pledge Agreement, the Pledge Agreement dated June 26, 1996
          between Holdco and KeyBank National Association, as agent, and the
          Pledge Agreement dated June 26, 1996 between CTC-Del and KeyBank
          National Association, as agent as each such Agreement may be amended.

               (k) The definition of "Projected Debt Service" in Section 1.1
shall be amended by deleting the word "Borrower" in the eighth and twelfth lines
thereof and in its place inserting the words "Borrowers or their Subsidiaries."

               (l) The definition of the term "Ratable Share" in Section 1.1
shall be amended in its entirety to read as follows:

                                      -5-
<PAGE>
 
               "Ratable Share" means, with respect to any Bank, its pro rata
                -------------                                               
          share of the Commitments, the Letters of Credit or the Loans.  The
          Ratable Shares of the Banks as of the effective date of the Second
          Amendment shall be as listed on Schedule 1 to the Second Amendment.

               (m) The definition of "Rate Hedging Obligations" in Section 1.1
shall be amended by deleting the word "Borrower" in the second and sixth lines
thereof and in its place inserting the words "Borrowers or their Subsidiaries".

               (n) The definition of the term "Termination Date" in Section 1.1
shall be amended in its entirety to read as follows:

               "Termination Date" means December 31, 2003.
                ----------------                          

               (o) The definition of "Total Debt" in Section 1.1 shall be
amended by deleting the word "Borrower" in each place it appears therein and in
its place inserting the words "Borrowers or their Subsidiaries".

               (p) Section 1.3 shall be amended by adding at the end thereof the
following sentence:

          "All financial or accounting calculations or determinations required
          pursuant to this Agreement unless otherwise expressly provided shall
          be made on a consolidated basis for the Borrowers and their
          Subsidiaries."

               (q) Sections 2.1(a) and (b) shall be amended in their entirety to
read as follows:

                    (a) Subject to the terms and conditions hereof, during the
          period up to but not including the Termination Date, the Banks shall
          make loans to the Borrowers in such amounts as the Borrowers may from
          time to time request (the "Reducing Loans") but not exceeding in
          aggregate principal amount at any one time outstanding $49,000,000 (as
          such amount may be reduced from time to time, the "Reducing
          Commitment").  Each Reducing Loan requested by the Borrowers shall be
          funded by the Banks in accordance with their Ratable Shares of the
          requested Reducing Loan.  A Bank shall not be obligated hereunder to
          make any additional Reducing Loan if immediately after making such
          Loan, the aggregate principal balance of all Reducing Loans made by
          such Bank would exceed such Bank's Ratable Share of the Reducing
          Commitment.  The Reducing Loans 

                                      -6-
<PAGE>
 
          may be comprised of Base Rate Loans or LIBOR Loans, as provided in
          Section 2.4 hereof.

                    (b) On December 31, 1998, the Reducing Commitment shall
          automatically reduce to the then outstanding amount of the Reducing
          Loans, and, on each date set forth in the table below, the Reducing
          Commitment shall automatically further reduce by an amount equal to
          that percentage set forth in such table for such date of the Reducing
          Commitment in effect on January 1, 1999:

<TABLE>
<CAPTION>
          ================================================================ 
          Calendar      March 31   June 30     September 30   December 31
          Year
          <S>        <C>        <C>       <C>            <C>          
          1999            3.50%     4.00%          4.00%         4.00%
          ----------------------------------------------------------------
          2000            4.00%     4.00%          4.00%         4.00%
          ----------------------------------------------------------------
          2001            4.00%     4.50%          4.50%         4.50%
          ----------------------------------------------------------------
          2002            4.50%     5.00%          5.00%         5.00%
          ----------------------------------------------------------------
          2003            5.00%     5.00%          5.00%         16.5%
          ================================================================
</TABLE>


               (r) The fifth sentence of Section 2.1(d)(i) shall be amended to
read in its entirety as follows:

          No Letter of Credit shall be issued after December 31, 1998 (except
          for any renewals thereof), or expire later than March 31, 2003, and no
          Letter of Credit shall have a term exceeding 364 days.

               (s) Section 2.4(d)(iii) shall be amended by deleting the date
"June 30, 1997" from the last sentence thereof and in its place inserting the
date "December 31, 1998".

               (t) Section 2.7(b)(ii) shall be amended by deleting the date
"December 31, 1996" from the first sentence thereof and in its place inserting
the date "December 31, 1998".

               (u) Section 2.7(b) shall be amended by adding clauses (v) and
(vi) at the end thereof which shall read in their entirety as follows:

               (v) Net Equity Proceeds.  If any Borrower issues or sells any
                   -------------------                                      
          shares of its capital stock or other equity interests or securities
          convertible into or exercisable for any shares of its capital stock or
          other equity interests, it shall, within five days of 

                                      -7-
<PAGE>
 
          such sale or issuance, make a mandatory prepayment of the Loans in an
          amount (not to exceed 100% of the net cash proceeds of such issuance
          or sale) equal to that amount which, had it been paid on the last day
          of the most recently ended quarter, would have caused the Leverage
          Ratio to equal 4.5 to 1.0; provided, however, that if, as of the date
                                     --------  -------  
          of such equity issuance, such Borrower is a party to a legally binding
          acquisition agreement for a Qualified Acquisition permitted pursuant
          to Section 8.10(b), such Borrower may use the proceeds of such
          issuance or sale to pay the purchase price of such Qualified
          Acquisition;

               (vi)  Required Divestitures.  On or before June 30, 1997, the
                     ---------------------                                  
          Borrowers shall make a mandatory prepayment of the Loans in an amount
          equal to $1,075,000, the proceeds for which shall be derived from
          either (A) the sale of the SMR Business and the SMR Assets, as such
          terms are defined in the Motorola Purchase Agreement, by CTR-PR or (B)
          the capital contribution received by CTC-Del in July of 1996. Together
          with such prepayment, the Borrowers shall deliver to the Agent written
          notice specifying the source of funds for such prepayment.

               (v) Section 2.7(c)(ii) shall be amended by deleting the phrase
"Section 2.7(b)(ii), (iii) or (iv)" in the first sentence thereof and in its
place inserting the phrase "Section 2.7(b)(ii), (iii), (iv), (v) or (vi)".

               (w) Section 3.1(b) shall be amended in its entirety to read as
follows:

                    (b) The Applicable Margin shall be determined by the Agent
          quarterly, and upon the making of each Loan and the issuance of each
          Letter of Credit, based on the financial statements and the Compliance
          Certificate delivered to the Banks pursuant to Sections 7.5(b) and (d)
          (in the case of a quarterly determination) and the compliance
          certificate delivered pursuant to Section 6.12(b) (in the case of the
          determination of the Applicable Margin upon the making of a Loan or
          the issuance of a Letter of Credit).  Any change in the interest rate
          on the Loans due to a change in the Applicable Margin shall be
          effective on the fifth Banking Day after delivery of such financial
          statements; provided, however, that if any such financial statements
                      --------  -------                                       
          or compliance certificate indicate an increase in the Applicable
          Margin and such financial statements or compliance certificate are not
          provided within the time period required in Section 7.5(a) or 

                                      -8-
<PAGE>
 
          (b), as the case may be, the increase in the interest rate due to such
          increase in the Applicable Margin shall be effective retroactively as
          of the fifth Banking Day after the date on which such financial
          statements were due. The Borrowers shall deliver to the Banks with
          each set of annual or quarterly financial statements which indicate a
          change in the Applicable Margin a notice with respect to such change.

               (x) Section 6.12 shall be amended to read in its entirety as
follows:


           6.12  Financial Information.
                 --------------------- 

               (a)  On the Closing Date, the Borrower shall have delivered to
          the Agent a pro forma balance sheet and income statement as of the
          Closing Date giving effect to the closing under the Purchase
          Agreement.

               (b)  The Borrowers shall have delivered to the Agent a pro forma
          compliance certificate in form and substance satisfactory to the Agent
          showing the Adjusted Leverage Ratio as the date of each borrowing or
          issuance of a Letter of Credit and the Borrowers' compliance with the
          financial covenants set forth in Section 8.

               (y)  Section 7.1 shall be amended to read in its entirety as
follows:

               7.1  Use of Proceeds.
                    --------------- 

               (a)  The Borrowers shall use the proceeds of the Reducing Loans
          only as follows: (i) to voluntarily prepay the Term Loan, subject to
          payment of the applicable Term Loan Prepayment Premium and other
          senior indebtedness in an amount not to exceed $18,000,000; (ii) for
          Qualified Acquisitions on or prior to December 31, 1998; (iii) for
          Capital Expenditures made pursuant to the last sentence of Section
          8.7; (iv) for fees and transaction costs associated with the Closing;
          and (v) for corporate purposes approved by the Majority Banks.

               (b)  The Borrowers shall use the proceeds of the Working Capital
          Loan only for working capital purposes.

               (z)  Section 7.3 shall be amended by adding at the end of the
third sentence thereof, the following sentence:

                                      -9-
<PAGE>
 
          The Borrowers shall maintain business interruption insurance in form
          and amount satisfactory to the Agent.
               (aa  Section 7.5 shall be amended in its entirety to read as
follows:

          7.5  Financial Statements and Reports.  The Borrowers shall maintain
               --------------------------------                               
          true and complete books and records of account in accordance with
          GAAP.  The Borrowers shall furnish to the Agent, for delivery to the
          Banks, the following financial statements, projections and notices at
          the following times:

               (a) As soon as available, but in no event later than ninety days
          after the end of each fiscal year of the Borrowers, the Borrowers
          shall furnish (i) audited consolidated financial statements, including
          balance sheets and income and expense statements of the Borrowers and
          their Subsidiaries, showing the financial condition of the Borrowers
          and their Subsidiaries as of the close of such fiscal year and the
          results of their operations during such fiscal year, together with a
          statement of cash flows of the Borrowers and their Subsidiaries and
          additional statements, schedules and footnotes as are customary in a
          complete accountant's report; such financial statements shall set
          forth, in comparative form, corresponding figures for the prior year
          and shall be certified by nationally recognized independent certified
          public accountants selected by the Borrowers and acceptable to the
          Agent and accompanied by the management letter of such accountants to
          the Borrowers, and the opinion of such accountants shall be
          unqualified and in a form reasonably satisfactory to the Agent; and
          (ii) a statement signed by such accountants to the effect that in
          connection with their examination of such financial statements they
          have reviewed the provisions of this Agreement and have no knowledge
          of any event or condition which constitutes an Event of Default or
          Possible Default or, if they have such knowledge, specifying the
          nature and period of existence thereof; provided, however, that in
                                                  --------  -------         
          issuing such statement, such independent accountants shall not be
          required to go beyond normal auditing procedures conducted in
          connection with their opinion referred to above;

               (b) As soon as available, but in no event later than forty-five
          days after the end of each quarter of the Borrowers, the Borrowers
          shall furnish (i) unaudited consolidated financial statements,
          including consolidated balance sheets and income statements of 

                                      -10-
<PAGE>
 
          the Borrowers and their Subsidiaries, showing the financial condition
          of the Borrowers and their Subsidiaries as of the end of such period
          and the results of their operations during such period and for the
          then elapsed portion of the fiscal year, which shall be accompanied by
          a statement of cash flows of the Borrowers and their Subsidiaries for
          such periods, (ii) an unaudited statement of income and expense for
          each Tower for such quarter and the then elapsed portion of the fiscal
          year as the Agent may reasonably request, (iii) a statement showing
          Capital Expenditures (including a comparison to Capital Expenditures
          budgeted for such period) and income taxes paid, each for such period,
          and (iv) for periods ending prior to December 31, 1998, separate
          income statements for such period for all Division A Acquisitions and
          Division B Acquisitions; all such financial statements shall set
          forth, in comparative form, corresponding figures for the equivalent
          period of the prior year and a comparison to budget for the relevant
          period, shall be in form and detail satisfactory to the Agent, and
          shall be certified as to accuracy and completeness by the chief
          financial officer of each Borrower;

               (c) As soon as available, but in no event later than thirty days
          after the end of each month, the Borrowers shall furnish an unaudited
          statement of income and expense for each Borrower for such month and
          for the then elapsed portion of the fiscal year, containing
          comparisons with the budget for such period and with the prior year;
          each such statement shall be in form and detail satisfactory to the
          Agent and shall be certified as to accuracy and completeness by the
          chief financial officer of each Borrower;

               (d) The financial statements required under (a) and (b) above,
          shall be accompanied by a compliance certificate in the form attached
          hereto as Exhibit L executed by the chief financial officer of each
                    ---------                                                
          Borrower setting forth the computations showing compliance with the
          financial covenants set forth in Section 8, and certifying that no
          Possible Default or Event of Default has occurred, or if any Event of
          Default or Possible Default has occurred, stating the nature thereof
          and the actions the Borrowers intend to take in connection therewith;

               (e) The Borrowers shall deliver (i) within forty-five days after
          the end of each fiscal year, an annual operating budget for the
          Borrowers for the next succeeding fiscal year, (ii) promptly upon
          preparation 

                                      -11-
<PAGE>
 
          thereof, any material revisions of such annual budget and (iii) after
          each monthly period in which there is a material adverse deviation
          from budget a certificate of the chief financial officer of each
          Borrower explaining the deviation and the action, if any, the
          Borrowers have taken or propose to take with respect thereto;

               (f) The Borrowers shall furnish (i) upon request, promptly after
          the filing thereof with the Internal Revenue Service, copies of each
          annual report with respect to each Plan established or maintained by
          any Borrower or any member of the Controlled Group for each plan year,
          including (A) where required by law, a statement of assets and
          liabilities of such Plan as of the end of such plan year and
          statements of changes in fund balance and in financial position, or a
          statement of changes in net assets available for plan benefits, for
          such plan year, certified by an independent public accountant
          satisfactory to the Agent, and (B) if prepared by or available to the
          Borrowers, an actuarial statement of such Plan applicable to such plan
          year, certified by an enrolled actuary of recognized standing
          acceptable to the Agent; and (ii) promptly after receipt thereof, a
          copy of any notice any Borrower or a member of the Controlled Group
          may receive from the Department of Labor or the Internal Revenue
          Service with respect to any Plan (other than notices of general
          application) which could result in a material liability to any
          Borrower; the Borrowers will promptly notify the Agent of any material
          taxes assessed, proposed to be assessed or which the Borrowers have
          reason to believe may be assessed against any Borrower or any member
          of the Controlled Group by the Internal Revenue Service with respect
          to any Plan or Benefit Arrangement; and

               (g)  Upon the Agent's written request, such other information
          about the financial condition, properties and operations of either
          Borrower as any Bank may from time to time reasonably request.

               (bb) Section 7.13 shall be amended by deleting the date "July 1,
2001" in the third line thereof, and in its place inserting the words "the
Termination Date".

               (cc) Section 7.16 shall be added, to read in its entirety as
follows:

               7.16  Borrowers' Subsidiaries.  So long as this Agreement remains
                     -----------------------                                    
          in effect or any of the Obligations remain unpaid or to be performed,
          or any Letter of Credit remains outstanding, the Borrowers shall cause

                                      -12-
<PAGE>
 
          each of their Subsidiaries to perform and comply with the affirmative
          covenants contained in Section 7 hereof (except for Section 7.13) and
          shall cause each of their Subsidiaries not, directly or indirectly, to
          take any of the actions set forth in Section 8 hereof nor permit any
          of the conditions set forth in Section 8 hereof to occur.

               (dd)  Section 8.4 shall be amended by (i) deleting the word
"Borrower" in the eighth line thereof and in its place inserting the words
"Borrowers and their Subsidiaries" and (ii) deleting the figure "$50,000" in the
last line thereof, and in its place inserting the words "$150,000 in the
aggregate."

               (ee)  Section 8.5 shall be amended by (i) deleting the word
"Borrower" from the sixth line thereof and in its place inserting the words
"Borrowers and their Subsidiaries" and (ii) inserting after the figure "$50,000"
in the eighth line thereof, the words "in the aggregate".

               (ff)  Section 8.6 shall be amended by (i) adding the words "by
the Borrowers and their Subsidiaries" after the word "payable" in the fourth
line thereof and (ii) deleting the figure "$50,000" in the sixth line thereof,
and in its place inserting the words "$150,000 in the aggregate."

               (gg)  Section 8.7 shall be amended in its entirety to read as
follows:

               8.7   Capital Expenditures.  Except for Qualified Acquisitions
                     --------------------                                    
          permitted pursuant to Section 8.10(b), the Borrowers and their
          Subsidiaries shall not make Capital Expenditures (not including (x)
          any payments in respect of Capitalized Lease Obligations or (y)
          expenditures of proceeds of casualty insurance policies reasonably and
          promptly applied to replace insured assets) which exceed the sum of
          (a) (i) $250,000 in the aggregate per year in each of fiscal years
          1996 and 1997, and (ii) $75,000 in the aggregate in any fiscal year
          thereafter, plus (b) an amount equal to 10% of operating cash flow,
          for the twelve month period most recently ended prior to such
          acquisition, of Towers acquired in each Qualified Acquisition.  In
          addition to the Capital Expenditures permitted pursuant to the
          foregoing sentence, the Borrowers may make Capital Expenditures
          through the Termination Date in an amount not to exceed $5,000,000 in
          the aggregate for the purpose of constructing new Towers.

                                      -13-
<PAGE>
 
               (hh)  Section 8.10(a) shall be amended by adding, after the words
"Section 8.10(b)" on the second line thereof, the phrase "or (c)".

               (ii)  Section 8.10(b)(vii)(C) shall be amended in its entirety to
read as follows:

          (C) the term of such note shall not extend beyond March 31, 2003;

               (jj)  Section 8.10(b)(xiii) shall be amended in its entirety to
read as follows:

               (xiii)  the closing of such acquisition shall occur no later than
          December 31, 1998.

               (kk)  Section 8.10 shall be amended by adding a new Section (c)
at the end thereof which shall read in its entirety as follows:

                (c)  Notwithstanding the provisions of Section 8.10(a), the
          Borrowers may take the actions described in Section 8.10(a)(iv) or (v)
          with the advance written approval of the Agent, which approval shall
          be in the sole discretion of the Agent.

               (ll)  Section 8.13(a) shall be amended to read in its entirety as
follows:

                     (a) Leverage Ratio.  The Borrower shall not permit the
                         --------------                                    
          Leverage Ratio as of any date in any period listed in Column A below
          to be greater than the ratio set forth in Column B below opposite such
          period:
<TABLE>
<CAPTION>
 
          Column A                                      Column B
          --------                                      --------  
                                        
          Period:                                       Permitted Ratio:
          ------                                        ---------------
          <S>                                           <C>
          Closing to December 30, 1998:                     5.50:1.0
                                                         
          December 31, 1998, to                             5.25:1.0
           March 30, 1999:                               
                                                         
          March 31, 1999, to                                4.50:1.0
           September 29, 1999:                           
                                                         
          September 30, 1999, to                            4.25:1.0
           March 30, 2000:                               
                                                         
          March 31, 2000, to March 30,                      3.50:1.0
           2001:                                         
</TABLE> 

                                      -14-
<PAGE>
 
<TABLE> 
          <S>                                              <C> 
          March 31, 2001, and                              3.00:1.0.
           thereafter:
</TABLE>
               (mm)  Section 8.13(e) shall be amended to read in its entirety as
follows:

               (e) Minimum Cash Reserve.  The Borrowers and their Subsidiaries
                   --------------------                                       
          shall not permit the sum of the aggregate amount of their cash and
          cash equivalents permitted pursuant to Section 8.11 plus the undrawn
          amount of the Working Capital Commitment to be less than or equal to,
          at any time $300,000.

               (nn)  Section 8.13 shall be amended by adding a new Section (f)
at the end thereof which shall read in its entirety as follows:

          (f) The Borrowers shall not permit the ratio of (i) Operating Cash
          Flow for any four quarter period to (ii) Interest Expense for such
          four quarter period to be less than 2.00:1.00.

               (oo)  Section 9.4 shall be amended by (i) deleting the words "the
Borrower" in the first and fourth lines thereof and in their place inserting the
words "Any Borrower or any of their Subsidiaries" and (ii) inserting after the
figure "$50,000" in the second line thereof the words "in the aggregate."

               (pp)  Section 9.5 shall be amended by deleting the words "The
Borrower" in the first line thereof and in their place inserting the words "Any
Borrower or any of their Subsidiaries."

               (qq)  Section 9.6 shall be amended by deleting the words "the
Borrower" in the third and fourth lines thereof and in their place inserting the
words "any Borrower or any of their Subsidiaries."

               (rr)  Section 9.7 shall be amended by deleting the words "the
Borrower" in each place it appears therein and in their place inserting the
words "any Borrower or any of their Subsidiaries."

               (ss)  Section 9.8 shall be amended by (i) deleting the words "the
Borrower" in the first and third line thereof and in their place inserting the
words "any Borrower or any of their Subsidiaries" and (ii) inserting after the
figure "$50,000" in the fourth line thereof the words "in the aggregate."

               (tt)  Section 9.9 shall be amended by (i) deleting the words "the
Borrower" from the first line thereof and inserting in their place the words
"any Borrower or any of their 

                                      -15-
<PAGE>
 
Subsidiaries" and (ii) deleting the words "the Borrower" from the eighth line
thereof and inserting in their place the words "each Borrower and each of their
Subsidiaries."

               (uu)  Section 9.10 shall be amended by deleting the words "the
Borrower" in each place it appears and inserting in their place the words "any
Borrower or any of their Subsidiaries."

               (vv)  Section 12.4 shall be amended by deleting the address of
the Agent and in its place inserting the following address:

               TO THE AGENT:

         KeyBank National Association
         127 Public Square
         M/C OH-01-127-0602
         Cleveland, Ohio  44114-1306
         Attention:  Jason R. Weaver
                     Media and Telecommunications Finance             
                       Division
         Telecopy:   216-689-4666
   
         Copy to:
   
         Timothy J. Kelley, Esq.
         Dow, Lohnes & Albertson, PLLC
         1200 New Hampshire Ave., N.W.
         Suite 800
         Washington, D.C.  20036
         Telecopy:   202-776-2222

               (ww)  The text of Exhibits A, B, D, E, F, H, I, K and L to the
Original Agreement shall be deleted and replaced with the text of Exhibits A, B,
D, E, F, H, I, K and L attached to this Amendment.

         2.   Consent.  Notwithstanding any limitation on prepayment of the Term
              -------                                                           
Loan set forth in Section 2.7(a)(ii) of the Original Agreement, but subject to
the payment of the applicable Term Loan Prepayment Premium, the Banks hereby
consent to the prepayment of the Term Loan in full on the effective date of this
Amendment with the proceeds of a Reducing Loan, and, upon such prepayment, the
Term Loan shall be deemed paid in full and shall not be deemed outstanding for
any purposes of the Loan Agreement.

         3.   Conditions to Effectiveness.  The amendments set forth in Section
              ---------------------------     
 1 and the consent set forth in Section 2 shall 

                                      -16-
<PAGE>
 
be effective upon satisfaction of all of the following conditions:

              (a) Each Borrower shall have delivered to the Agent a certified
copy of resolutions of its Board of Directors evidencing approval of the
execution, delivery and performance of this Amendment, the Amended Notes, and
the other agreements, documents and instruments required pursuant hereto.

              (b) The Borrowers shall have executed and delivered to the Banks
Amended and Restated Revolving Credit Notes in the form attached hereto as
                                                                          
Exhibit A (the "Amended Reducing Notes"), and Amended and Restated Working
- ---------                                                                 
Capital Notes in the form attached hereto as Exhibit B (the "Amended Working
                                             ---------                      
Capital Notes" and, together with the Amended Reducing Notes, collectively, the
"Amended Notes" and individually, an "Amended Note").

              (c) Holdco shall have executed and delivered to the Agent the
Acknowledgment and Agreement set forth in Annex 1 attached hereto.

              (d) Spectrum Site Management Corporation shall have executed and
delivered to the Agent the Acknowledgment and Agreement set forth in Annex 2
attached hereto.

              (e) Centennial Fund IV, L.P. shall have executed and delivered to
the Agent the Acknowledgment and Agreement set forth in Annex 3 attached hereto.

              (f) The Borrowers, Holdco, Spectrum Site Management Corporation
and Centennial Fund IV, L.P. shall have executed and delivered such amendments
to the Pledge Agreements, Security Agreements, Mortgages, Guaranty, and other
Collateral Documents to which they are respectively parties, as the Agent and
its counsel may request, in form and substance satisfactory to the Agent.

              (g) The Borrowers shall have delivered to the Agent the following:

                  (i)    certificates of good standing for CTC-Del from the
Secretary of State of each of the States of Delaware and Texas, and a
certificate of good standing for CTC-PR from the Secretary of the Commonwealth
of Puerto Rico, in each case dated as of a date as near to the effective date as
practicable;

                  (ii)   a certificate signed by the Secretary or Assistant
Secretary of each Borrower certifying that attached thereto are true and
complete copies of the Certificate of Incorporation and By-Laws of each
Borrower;

                                      -17-
<PAGE>
 
                  (iii)  an incumbency certificate for each Borrower; and
  
                  (iv)   such other documents as any Bank may reasonably request
in connection with the proceedings taken by either Borrower or Holdco
authorizing this Amendment, the Amended Notes or the other Collateral Documents
and the transactions contemplated hereby, to the extent it is a party thereto.

              (h) The Borrowers shall have paid to the Agent and the Banks all
commitment fees accrued under the Original Agreement and the fees required
pursuant to Section 4.

              (i) There shall have been no changes in the business, properties,
operations, prospects or condition, financial or otherwise, of either Borrower
since December 31, 1995, which are individually or in the aggregate materially
adverse.

              (j) The Borrowers shall have delivered to the Agent opinions in
form and substance satisfactory to the Agent from the general counsel, Texas and
Puerto Rico counsel of the Borrowers.

              (k) The Borrowers shall have delivered to the Agent the
certificate referred to in Section 7.15 of the Loan Agreement calculating the
amount of Stockholder Debt that must be secured in order for each Borrower not
to be deemed to be a "United States Real Property Holding Corporation" for
purposes of Section 897 of the Code.

              (l) The Borrowers shall have paid to each Bank such Bank's Ratable
Share of the applicable Term Loan Prepayment Premium and all accrued and unpaid
interest on the Term Loan or agreed to make such payments at such later date as
may be designated by such Bank.

              (m) Spectrum Site Management Corporation shall have become a
direct wholly-owned subsidiary of CTC-Del.

         4.   Fees.  The Borrowers shall pay to the Agent the fees provided in 
              ----    
the separate letter agreement between the Borrowers and the Agent of even date
herewith.

         5.   Representations, Warranties and Events of Default.
              ------------------------------------------------- 

              (a) Except as amended hereby, the terms, provisions, conditions
and agreements of the Original Agreement are hereby ratified and confirmed and
shall remain in full force and effect. Each and every representation and
warranty of the Borrowers set forth in the Original Agreement, as amended
hereby, 

                                      -18-
<PAGE>
 
other than those which by their terms are limited to a specific date, is hereby
confirmed and ratified in all material respects and such representations and 
warranties as so confirmed and ratified shall be deemed to have been made and 
undertaken as of the date of this Amendment as well as at the time they were 
made and undertaken.

          (b) The Borrowers, jointly and severally, represent and warrant that:

              (i)   No Event of Default or Possible Default now exists or will 
exist immediately following the execution hereof or after giving effect to the
transactions contemplated hereby.

              (ii)  All necessary corporate or shareholder actions on the part
of each Borrower, Holdco and each stockholder of Holdco to authorize the
execution, delivery and performance of this Amendment, the Amended Notes, and
all other amendments, agreements, documents or instruments required pursuant
hereto or thereto have been taken; this Amendment, the Amended Notes and each
such other amendment, agreement, document or instrument have been duly and
validly executed and delivered and are legally valid and binding upon each
Borrower that is a party thereto and enforceable in accordance with their
respective terms, except to the extent that the enforceability thereof may be
limited by bankruptcy, insolvency or like laws or by general equitable
principles.

              (iii) The execution, delivery and performance of this Amendment,
the Amended Notes and all other amendments, agreements, documents and
instruments required pursuant hereto or thereto, and all actions and
transactions con templated hereby and thereby will not (A) violate, be in
conflict with, result in a breach of or constitute (with due notice or lapse of
time or both) a default under (I) any provision of the charter documents or by-
laws of either Borrower, (II) any arbitration award or any order of any court or
of any other governmental agency or authority, (III) any license, permit or
authorization granted to either Borrower or under which either Borrower
operates, or (IV) any applicable law, rule, order or regulation, indenture,
agreement or other instrument to which either Borrower is a party or by which
either Borrower or any of its properties is bound and which has not been waived
or consented to, or (B) result in the creation or imposition of any lien, charge
or encumbrance of any nature whatsoever, except as expressly permitted in the
Loan Agreement, upon any of the properties of either Borrower.

              (iv) No consent, approval or authorization of, or filing, 
registration or qualification with, any 


                                     -19-
<PAGE>
 
governmental authority (including, without limitation, the FCC and any other
Licensing Authority) is required to be obtained by either Borrower or Holdco in
connection with the execution, delivery or performance of this Amendment, the
Amended Notes or any amendment, agreement, document or instrument required in
connection herewith or therewith which has not already been obtained or
completed.

     6.   Affirmation of the Borrowers.  The Borrowers acknowledge that the
          ----------------------------                                     
security interests and liens granted by the Borrowers to the Agent, for the
benefit of the Banks, pursuant to the Subsidiary Pledge Agreement dated June 26,
1996 between CTC-Del and KeyBank National Association, as agent, the Security
Agreement, the Mortgages and the other Collateral Documents, as amended pursuant
hereto, remain in full force and effect and shall continue to secure all
Obligations of the Borrowers as such Obligations may be increased pursuant
hereto.

     7.   Fees and Expenses.  As required under the Original Agreement, the
          -----------------                                                
Borrowers, jointly and severally, will reimburse the Agent upon demand for all
out-of-pocket costs, charges and expenses of the Agent (including fees and
disbursements of special counsel to the Agent and local counsel to the Agent in
Puerto Rico) in connection with the preparation, negotiation, execution and
delivery of this Amendment and the other agreements or documents relating hereto
or required hereby.

     8.   Counterparts.  This Amendment may be executed in as many counterparts
          ------------                                                         
as may be convenient and shall become binding when each Borrower, the Agent and
the Banks have executed at least one counterpart.

     9.   Governing Law.  This Amendment shall be a contract made under and
          -------------                                                    
governed by the laws of the State of Ohio, without regard to the conflicts of
law provisions thereof.

     10.  Binding Effect.  This Amendment shall be binding upon and shall inure
          --------------                                                       
to the benefit of the Borrowers, the Agent and the Banks and their respective
successors and assigns.

     11.  Reference to Original Agreement.  Except as amended hereby, the
          -------------------------------                                
Original Agreement shall remain in full force and effect and is hereby ratified
and confirmed in all respects. On and after the effectiveness of the amendments
to the Original Agreement accomplished hereby, each reference in the Original
Agreement to "this Agreement", "hereunder", "hereof", "herein" or words of like
import, and each reference to the Original Agreement or the original notes
issued pursuant thereto in any Note or other Collateral Document, or other
agreement, document or instrument executed and delivered pursuant to the
Original 


                                     -20-
<PAGE>
 
Agreement, shall be deemed a reference to the Original Agreement, as amended
hereby, or the Amended Notes, as the case may be.

     12.  No Other Modifications; Same Indebtedness.  Except as expressly
          -----------------------------------------                      
provided in this Amendment, all of the terms and conditions of the Original
Agreement remain unchanged and in full force and effect.  The modifications
effected by this Amendment and by the other documents and instruments
contemplated hereby shall not be deemed to provide for or effect a repayment and
re-advance of any of the Loans now outstanding, it being the intention of the
Borrowers, the Agent and the Banks that the Loans outstanding under the Original
Agreement, as amended by this Amendment, be and are the same Indebtedness as
that owing under the Original Agreement immediately prior to the effectiveness
hereof.  It is not the intention of the parties to cause an extinctive novation
of the Original Agreement, any Collateral Document or the obligations
thereunder.



                                     -21-
<PAGE>
 
     IN WITNESS WHEREOF, the parties have executed this Second Amendment to Loan
Agreement as of the date first above written.

BORROWERS:

CASTLE TOWER CORPORATION



By: /s/ TED B. MILLER, JR.
   ---------------------------
Name: Ted B. Miller, Jr.
     -------------------------
Title: President
      ------------------------

CASTLE TOWER CORPORATION (PR)



By: /s/ TED B. MILLER, JR.
   --------------------------- 
Name: Ted B. Miller, Jr.
     -------------------------
Title: President
      ------------------------

BANKS:

KEYBANK NATIONAL ASSOCIATION



By: /s/ JASON R. WEAVER
   ---------------------------
   Jason R. Weaver
   Assistant Vice President

WELLS FARGO BANK (TEXAS),
NATIONAL ASSOCIATION



By: /s/ BENNETT D. DOUGLAS
   ---------------------------
   Bennett D. Douglas
   Vice President

AGENT:

KEYBANK NATIONAL ASSOCIATION



By: /s/ JASON R. WEAVER
   ---------------------------
   Jason R. Weaver
   Assistant Vice President




                                     -22-
<PAGE>
 
                                  SCHEDULE 1
                                  ----------

                       List of Banks and Ratable Shares
                       --------------------------------


<TABLE>
<CAPTION>
                                        Working Capital Loan
               Reducing Loan Amount     Amount and Ratable
               and Ratable Share of     Share of Working
Banks:         Reducing Commitment:     Capital Commitment:
- -----          -------------------      ------------------
<S>            <C>                      <C>
KeyBank             $24,500,000              $500,000
                      (50%)                    (50%)

Wells Fargo         $24,500,000              $500,000
                      (50%)                    (50%)
</TABLE>
<PAGE>
 
                               LIST OF EXHIBITS
                               ----------------



Exhibit A                     Form of Amended and Restated 
                              Reducing Note

Exhibit B                     Form of Amended and Restated 
                              Working Capital Note

Exhibit D                     Financial Statements

Exhibit E                     Projections

Exhibit F                     Capitalization

Exhibit G                     Proceedings, Litigation and Non-
                              Compliance with Law

Exhibit H                     Liens and Indebtedness

Exhibit I                     List of Contracts, Commitments and 
                              Licenses

Exhibit J                     ERISA Liabilities and Plans

Exhibit K                     Real Property List

Exhibit L                     Form of Compliance Certificate
<PAGE>
 
                                   EXHIBIT A
                                   ---------

              AMENDED AND RESTATED REDUCING REVOLVING CREDIT NOTE
              ---------------------------------------------------


$24,500,000                                               January __, 1997


     FOR VALUE RECEIVED, CASTLE TOWER CORPORATION, a Delaware corporation ("CTC-
Del"), and CASTLE TOWER CORPORATION (PR), a Puerto Rican corporation ("CTC-PR",
and together with CTC-Del collectively the "Makers" and individually a "Maker"),
hereby jointly and severally promise to pay to the order of ___________ (the
"Payee"), on or before December 31, 2003, in the manner and at the place
provided in the Loan Agreement, as that term is defined below, the principal sum
of $24,500,000, or if less, the outstanding balance of the Reducing Loans, as
that term is defined in the Loan Agreement described below, made by the Payee.

     The unpaid principal balance of this Note shall bear interest prior to
maturity at the rates determined in accordance with the provisions of that
certain Loan Agreement dated as of April 26, 1995, as amended by the First
Amendment to Loan Agreement dated as of June 26, 1996, and as amended by the
Second Amendment to Loan Agreement dated as of January __, 1997, among the
Makers, KeyBank National Association (formerly known as "Society National
Bank"), as Agent, the Payee and the other financial institutions as may from
time to time be parties thereto (as the same may be amended, modified, extended
or restated from time to time, the "Loan Agreement").  Interest accrued on each
Base Rate Loan shall be paid quarterly in arrears on each Quarterly Date after
the date hereof until such Loan is paid in full, and interest accrued on each
LIBOR Loan shall be paid on the last day of the Interest Period thereof.

     This Note is an amendment and restatement of the Amended and Restated
Reducing Revolving Credit Note dated April 26, 1995, of CTC-Del to the Payee
(the "Original Note") and not a replacement, substitution or repayment thereof.
The indebtedness and liabilities of CTC-Del under the Original Note evidenced
hereby remain in full force and effect as amended, renewed and extended hereby.

     This Note is subject to voluntary and mandatory prepayment in whole or in
part at the times and in the manner specified in the Loan Agreement.

     The Payee may enter all amounts of principal borrowed, paid or prepaid at
any time on the grid annexed hereto or on any separate record thereof maintained
by the Payee.
<PAGE>
 
     This Note evidences indebtedness of the Makers to the Payee arising under
the Loan Agreement, to which reference is hereby made for a statement of the
rights of the Payee and the duties and obligations of the Makers in relation
thereto, but neither this reference to the Loan Agreement nor any provision
thereof shall affect or impair the absolute and unconditional obligation of the
Makers to pay the principal of and interest on this Note when due.

     The principal of and all interest on this Note shall be paid as provided in
the Loan Agreement in immediately available funds constituting lawful money of
the United States of America, not later than 11:00 A.M. (Cleveland time) on the
day when due.

     Upon the occurrence of any Event of Default, the entire outstanding
principal amount of this Note and (to the extent permitted by law) unpaid
interest shall bear interest thereafter until paid in full at the Default
Interest Rate which shall be payable on demand.

     Subject to the provisions of Section 10 of the Loan Agreement, the entire
unpaid principal balance of this Note, together with all interest accrued
thereon, shall become immediately due and payable upon the occurrence of an
Event of Default.  Upon the occurrence of any Event of Default, the holder
hereof shall have all of the rights, powers and remedies provided in the Loan
Agreement or in any Collateral Document or at law or in equity.  Failure of the
Payee or any holder of this Note to exercise any such right or remedy available
hereunder or under the Loan Agreement or any Collateral Document or at law or in
equity shall not constitute a waiver of the right to exercise subsequently such
option or such other right or remedy.

     The payment of this Note is secured by certain Security Agreements, certain
Pledge Agreements, certain Guarantees and certain Mortgages and Collateral
Assignments of Leases, all as more fully identified in the Loan Agreement.

     To the extent permitted by law, except as otherwise provided herein or in
the Loan Agreement, the Makers and each endorser of this Note, and their
respective heirs, successors, legal representatives and assigns, hereby
severally waive presentment; protest and demand; notice of protest, demand,
dishonor and nonpayment; and diligence in collection, and agree to the
application of any bank balance as payment or part payment of this Note or as an
offset hereto as provided in the Loan Agreement, and further agree that the
holder hereof may release all or any part of the collateral given as security
for this Note or any rights of the holder thereunder and may amend this Note
(with the consent of the Makers), without notice to, and without in any way
affecting the liability of, the Makers or any endorser 


                                      -2-
<PAGE>
 
of this Note, and their respective heirs, successors, legal representatives and
assigns.

     If at any time the indebtedness evidenced by this Note is collected through
legal proceedings or this Note is placed in the hands of attorneys for
collection, the Makers and each endorser of this Note, and their respective
heirs, successors, legal representatives and assigns, hereby jointly and
severally agree to pay all costs and expenses (including reasonable attorneys'
fees if permitted by law) incurred by the holder of this Note in collecting or
attempting to collect such indebtedness.

     The rate of interest payable on this Note from time to time shall in no
event exceed the maximum rate permissible under applicable law.  If the rate of
interest payable on this Note is ever reduced as a result of the preceding
sentence and at any time thereafter the maximum rate permitted by applicable law
shall exceed the rate of interest provided for on this Note, then the rate
provided for on this Note shall be increased to the maximum rate permitted by
applicable law for such period as is required so that the total amount of
interest received by the Payee is that which would have been received by the
Payee but for the operation of the preceding sentence.

     THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH THE
PROVISIONS OF, THE LAW OF THE STATE OF OHIO, WITHOUT REGARD TO THE CONFLICTS OF
LAW PRINCIPLES THEREOF.

     Capitalized terms used herein and not otherwise defined shall have the
meanings assigned to them in the Loan Agreement.


CASTLE TOWER CORPORATION



By:
   --------------------------
Name:
     ------------------------
Title:
      -----------------------

CASTLE TOWER CORPORATION (PR)



By:
   --------------------------
Name:
     ------------------------
Title:
      -----------------------



                                      -3-
<PAGE>
 
                             REVOLVING CREDIT GRID
                             ---------------------
- --------------------------------------------------------------------------------
                   AMOUNT           AMOUNT          UNPAID        OFFICER'S
DATE              BORROWED           PAID          BALANCE        INITIALS
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
<PAGE>
 
                                   EXHIBIT B
                                   ---------

                   AMENDED AND RESTATED WORKING CAPITAL NOTE
                   -----------------------------------------


$500,000                                                   January __, 1997


     FOR VALUE RECEIVED, CASTLE TOWER CORPORATION, a Delaware corporation ("CTC-
Del"), and CASTLE TOWER CORPORATION (PR), a Puerto Rican corporation ("CTC-PR",
and together with CTC-Del collectively the "Makers" and individually a "Maker"),
hereby jointly and severally promise to pay to the order of _________ (the
"Payee"), on or before December 31, 2003, in the manner and at the place
provided in the Loan Agreement, as that term is defined below, the principal sum
of $500,000, or if less, the outstanding balance of the Working Capital Loans,
as that term is defined in the Loan Agreement described below, made by the
Payee.

     The unpaid principal balance of this Note shall bear interest prior to
maturity at the rates determined in accordance with the provisions of that
certain Loan Agreement dated as of April 26, 1996, as amended by the First
Amendment to Loan Agreement dated as of June 26, 1996, as amended by the Second
Amendment to Loan Agreement dated as of January __, 1997, among the Makers,
KeyBank National Association (formerly known as "Society National Bank"), as
Agent, the Payee and the other financial institutions as may from time to time
be parties thereto (as the same may be amended, modified, extended or restated
from time to time, the "Loan Agreement").  Interest accrued on each Base Rate
Loan shall be paid quarterly in arrears on each Quarterly Date after the date
hereof until such Loan is paid in full, and interest accrued on each LIBOR Loan
shall be paid on the last day of the Interest Period thereof.

     This Note is an amendment and restatement of the Amended and Restated
Working Capital Note dated June 26, 1996, of the Makers to the Payee (the
"Original Note") and not a replacement, substitution or repayment thereof.  The
indebtedness and liabilities of the Makers under the Original Note evidenced
hereby remain in full force and effect as amended, renewed and extended hereby.

     This Note is subject to voluntary and mandatory prepayment in whole or in
part at the times and in the manner specified in the Loan Agreement.

     The Payee may enter all amounts of principal borrowed, paid or prepaid at
any time on the grid annexed hereto or on any separate record thereof maintained
by the Payee.
<PAGE>
 
     This Note evidences indebtedness of the Makers to the Payee arising under
the Loan Agreement, to which reference is hereby made for a statement of the
rights of the Payee and the duties and obligations of the Makers in relation
thereto, but neither this reference to the Loan Agreement nor any provision
thereof shall affect or impair the absolute and unconditional obligation of the
Makers to pay the principal of and interest on this Note when due.

     The principal of and all interest on this Note shall be paid as provided in
the Loan Agreement in immediately available funds constituting lawful money of
the United States of America, not later than 11:00 A.M. (Cleveland time) on the
day when due.

     Upon the occurrence of any Event of Default, the entire outstanding
principal amount of this Note and (to the extent permitted by law) unpaid
interest shall bear interest thereafter until paid in full at the Default
Interest Rate which shall be payable on demand.

     Subject to the provisions of Section 10 of the Loan Agreement, the entire
unpaid principal balance of this Note, together with all interest accrued
thereon, shall become immediately due and payable upon the occurrence of an
Event of Default.  Upon the occurrence of any Event of Default, the holder
hereof shall have all of the rights, powers and remedies provided in the Loan
Agreement or in any Collateral Document or at law or in equity.  Failure of the
Payee or any holder of this Note to exercise any such right or remedy available
hereunder or under the Loan Agreement or any Collateral Document or at law or in
equity shall not constitute a waiver of the right to exercise subsequently such
option or such other right or remedy.

     The payment of this Note is secured by certain Security Agreements, certain
Pledge Agreements, certain Guarantees and certain Mortgages and Collateral
Assignments of Leases, all as more fully identified in the Loan Agreement.

     To the extent permitted by law, except as otherwise provided herein or in
the Loan Agreement, the Makers and each endorser of this Note, and their
respective heirs, successors, legal representatives and assigns, hereby
severally waive presentment; protest and demand; notice of protest, demand,
dishonor and nonpayment; and diligence in collection, and agree to the
application of any bank balance as payment or part payment of this Note or as an
offset hereto as provided in the Loan Agreement, and further agree that the
holder hereof may release all or any part of the collateral given as security
for this Note or any rights of the holder thereunder and may amend this Note
(with the consent of the Makers), without notice to, and without in any way
affecting the liability of, the Makers or any endorser 



                                      -2-
<PAGE>
 
of this Note, and their respective heirs, successors, legal representatives and
assigns.

     If at any time the indebtedness evidenced by this Note is collected through
legal proceedings or this Note is placed in the hands of attorneys for
collection, the Makers and each endorser of this Note, and their respective
heirs, successors, legal representatives and assigns, hereby jointly and
severally agree to pay all costs and expenses (including reasonable attorneys'
fees if permitted by law) incurred by the holder of this Note in collecting or
attempting to collect such indebtedness.

     The rate of interest payable on this Note from time to time shall in no
event exceed the maximum rate permissible under applicable law.  If the rate of
interest payable on this Note is ever reduced as a result of the preceding
sentence and at any time thereafter the maximum rate permitted by applicable law
shall exceed the rate of interest provided for on this Note, then the rate
provided for on this Note shall be increased to the maximum rate permitted by
applicable law for such period as is required so that the total amount of
interest received by the Payee is that which would have been received by the
Payee but for the operation of the preceding sentence.

     THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH THE
PROVISIONS OF, THE LAW OF THE STATE OF OHIO, WITHOUT REGARD TO THE CONFLICTS OF
LAW PRINCIPLES THEREOF.

     Capitalized terms used herein and not otherwise defined shall have the
meanings assigned to them in the Loan Agreement.


CASTLE TOWER CORPORATION



By:
   --------------------------
Name:
     ------------------------
Title:
      -----------------------


CASTLE TOWER CORPORATION (PR)



By:
   --------------------------
Name:
     ------------------------
Title:
      -----------------------



                                      -3-
<PAGE>
 
                             REVOLVING CREDIT GRID
                             ---------------------
- --------------------------------------------------------------------------------
              AMOUNT          AMOUNT         UNPAID             OFFICER'S
DATE         BORROWED          PAID          BALANCE            INITIALS
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
<PAGE>
 
                                    ANNEX 1
                                    -------

           ACKNOWLEDGMENT AND AGREEMENT OF CASTLE TOWER HOLDING CORP.
           ----------------------------------------------------------


     The undersigned hereby (a) certifies that it is the sole shareholder of
CTC-Del and consents to the execution and delivery by the Borrowers of the
foregoing Second Amendment to Loan Agreement and the Amended Notes described
therein, and (b) acknowledges and agrees (i) that the Pledge Agreement dated
June 26, 1996 between the undersigned and KeyBank National Association, as agent
(the "Spectrum Pledge Agreement"), the Holdco Pledge Agreement, the Guaranty and
each other Collateral Document (as those terms are defined in the Loan
Agreement, and as such documents may be amended pursuant to the Second Amendment
to Loan Agreement) to which it is a party, and all of its respective obligations
thereunder, remain in full force and effect, (ii) that the security interests
granted pursuant to such Spectrum Pledge Agreement and Holdco Pledge Agreement
secure all of the Obligations, as increased pursuant to the Second Amendment to
Loan Agreement, and (iii) that the Guaranteed Obligations, as that term is
defined in the Guaranty, include all of the Obligations, as increased pursuant
to the Second Amendment to Loan Agreement.

CASTLE TOWER HOLDING CORP.



By:  
     -------------------------
     Name:
     Title:
<PAGE>
 
                                    ANNEX 2
                                    -------

                        ACKNOWLEDGMENT AND AGREEMENT OF
                      SPECTRUM SITE MANAGEMENT CORPORATION
                      ------------------------------------


     The undersigned hereby (a) consents to the execution and delivery by the
Borrowers of the foregoing Second Amendment to Loan Agreement and the Amended
Notes described therein, and (b) acknowledges and agrees (i) that the Security
Agreement dated June 26, 1996 between the undersigned and KeyBank National
Association, as agent (the "Security Agreement"), and the Guaranty executed by
the undersigned in favor of KeyBank National Association, as agent (the
"Guaranty") and each other Collateral Document (as defined in the Loan
Agreement, and as such documents may be amended pursuant to the Second Amendment
to Loan Agreement) to which it is a party, and all of its respective obligations
thereunder, remain in full force and effect, (ii) that the security interests
granted pursuant to such Security Agreement secure all of the Obligations, as
increased pursuant to the Second Amendment to Loan Agreement, and (iii) that the
Guaranteed Obligations, as that term is defined in the Guaranty, include all of
the Obligations, as increased pursuant to the Second Amendment to Loan
Agreement.

SPECTRUM SITE MANAGEMENT CORPORATION



By:  
     ------------------------
     Name:
     Title:
<PAGE>
 
                                    ANNEX 3
                                    -------

            ACKNOWLEDGMENT AND AGREEMENT OF CENTENNIAL FUND IV, L.P.
            --------------------------------------------------------


     The undersigned hereby (a) certifies that it is a shareholder of Holdco and
consents to the execution and delivery by the Borrowers of the foregoing Second
Amendment to Loan Agreement and the Amended Notes described therein, and (b)
acknowledges and agrees (i) that the Stockholder Pledge Agreement, the
Stockholder Subordination Agreement and each other Collateral Document (as those
terms are defined in the Loan Agreement, and as such documents may be amended
pursuant to the Second Amendment to Loan Agreement) to which it is a party, and
all of its respective obligations thereunder, remain in full force and effect,
(ii) that the security interests granted pursuant to such Stockholder Pledge
Agreement secure all of the Obligations, as increased pursuant to the Second
Amendment to Loan Agreement, and (iii) that all of the Obligations, as increased
pursuant to the Second Amendment to Loan Agreement, constitute Senior Debt as
that term is defined in the Stockholder Subordination Agreement.

CENTENNIAL FUND IV, L.P.

By:  Centennial Holdings IV, L.P.,
     its general partner


By:  
     -----------------------------
     Name:
     Title:

<PAGE>
 
                                                                    Exhibit 10.5

                                                                  EXECUTION COPY
                                                                  --------------

                       THIRD AMENDMENT TO LOAN AGREEMENT


          This THIRD AMENDMENT TO LOAN AGREEMENT is made and entered into as of
April 3, 1997, by and among CASTLE TOWER CORPORATION, a Delaware corporation
("CTC-Del"), CASTLE TOWER CORPORATION (PR), a Puerto Rico corporation ("CTC-PR"
and, together with CTC-Del, collectively, the "Borrowers" and individually, a
"Borrower"), the FINANCIAL INSTITUTIONS listed on the signature pages hereof,
and KEYBANK NATIONAL ASSOCIATION (formerly known as "Society National Bank"), as
agent (the "Agent").

                                    RECITALS
                                    --------

          A.   CTC-Del, CTC-PR, the Agent and the Banks entered into a Loan
Agreement dated as of April 26, 1995 (as amended by the First Amendment to Loan
Agreement dated as of June 26, 1996, and the Second Amendment to Loan Agreement
dated as of January 17, 1997, the "Original Agreement"), pursuant to which the
Banks agreed to make available to the Borrowers loans of up to $50,000,000.  The
Original Agreement, as amended hereby, may be referred to hereinafter as the
"Loan Agreement."  Capitalized terms used herein and not otherwise defined shall
have the meanings assigned to them in the Loan Agreement.

          B.   The Borrowers desire to revise Section 8.5 of the Original
Agreement as set forth herein.  Subject to the terms and conditions of this
Amendment, the Agent and the Banks have agreed to such request.


                                   AGREEMENTS
                                   ----------

          In consideration of the foregoing Recitals and of the covenants and
representations contained herein, and for other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the Borrowers, the
Agent and the Banks agree as follows:

          1.   Amendments.  The Original Agreement shall be amended as follows:
               ----------                                                       
Section 8.5 shall be amended by deleting the figure "$50,000" in the eighth line
thereof, and in its place inserting the figure "$150,000".

          2.   Representations, Warranties and Events of Default.
               ------------------------------------------------- 

          (a) Except as amended hereby, the terms, provisions, conditions and
agreements of the Original Agreement are hereby ratified and confirmed and shall
remain in full force 
<PAGE>
 
and effect. Each and every representation and warranty of the Borrowers set
forth in the Original Agreement, other than those which by their terms are
limited to a specific date, is hereby confirmed and ratified in all material
respects and such representations and warranties as so confirmed and ratified
shall be deemed to have been made and undertaken as of the date of this
Amendment as well as at the time they were made and undertaken.

               (b) The Borrowers, jointly and severally, represent and warrant
that:

                   (i)   No Event of Default or Possible Default now exists or
will exist immediately following the execution hereof or after giving effect to
the transactions contemplated hereby.

                   (ii)  All necessary corporate or shareholder actions on the
part of each Borrower, Holdco and each stockholder of Holdco to authorize the
execution, delivery and performance of this Amendment have been taken; this
Amendment has been duly and validly executed and delivered and is legally valid
and binding upon each Borrower and enforceable in accordance with its terms,
except to the extent that the enforceability may be limited by bankruptcy,
insolvency or like laws or by general equitable principles.

                   (iii) The execution, delivery and performance of this
Amendment and all actions and transactions contemplated hereby will not (A)
violate, be in conflict with, result in a breach of or constitute (with due
notice or lapse of time or both) a default under (I) any provision of the
charter documents or by-laws of either Borrower, (II) any arbitration award or
any order of any court or of any other governmental agency or authority, (III)
any license, permit or authorization granted to either Borrower or under which
either Borrower operates, or (IV) any applicable law, rule, order or regulation,
indenture, agreement or other instrument to which either Borrower is a party or
by which either Borrower or any of its properties is bound and which has not
been waived or consented to, or (B) result in the creation or imposition of any
lien, charge or encumbrance of any nature whatsoever, except as expressly
permitted in the Loan Agreement, upon any of the properties of either Borrower.

                   (iv)  No consent, approval or authorization of, or filing,
registration or qualification with, any governmental authority (including,
without limitation, the FCC and any other Licensing Authority) is required to be
obtained by either Borrower or Holdco in connection with the execution, 

                                      -2-
<PAGE>
 
delivery or performance of this Amendment which has not already been obtained or
completed.

          3.   Affirmation of the Borrowers.  The Borrowers acknowledge that the
               ----------------------------                                     
security interests and liens granted by the Borrowers to the Agent, for the
benefit of the Banks, pursuant to the Amended and Restated Subsidiary Pledge
Agreement dated January 17, 1997 between CTC-Del and KeyBank National
Association, as agent, the Security Agreement, the Mortgages and the other
Collateral Documents remain in full force and effect and shall continue to
secure all Obligations of the Borrowers.

          4.   Fees and Expenses.  As required under the Original Agreement, the
               -----------------                                                
Borrowers, jointly and severally, will reimburse the Agent upon demand for all
out-of-pocket costs, charges and expenses of the Agent (including fees and
disbursements of special counsel to the Agent) in connection with the
preparation, negotiation, execution and delivery of this Amendment and the other
agreements or documents relating hereto or required hereby.

          5.   Counterparts.  This Amendment may be executed in as many
               ------------                                            
counterparts as may be convenient and shall become binding when each Borrower,
the Agent and the Banks have executed at least one counterpart.

          6.   Governing Law.  This Amendment shall be a contract made under and
               -------------                                                    
governed by the laws of the State of Ohio, without regard to the conflicts of
law provisions thereof.

          7.   Binding Effect.  This Amendment shall be binding upon and shall
               --------------                                                 
inure to the benefit of the Borrowers, the Agent and the Banks and their
respective successors and assigns.

          8.   Reference to Original Agreement.  Except as amended hereby, the
               -------------------------------                                
Original Agreement shall remain in full force and effect and is hereby ratified
and confirmed in all respects. On and after the effectiveness of the amendments
to the Original Agreement accomplished hereby, each reference in the Original
Agreement to "this Agreement", "hereunder", "hereof", "herein" or words of like
import, and each reference to the Original Agreement in any Note or other
Collateral Document, or other agreement, document or instrument executed and
delivered pursuant to the Original Agreement, shall be deemed a reference to the
Original Agreement, as amended hereby.

                                      -3-
<PAGE>
 
          IN WITNESS WHEREOF, the parties have executed this Third Amendment to
Loan Agreement as of the date first above written.

BORROWERS:

CASTLE TOWER CORPORATION



By: /s/ JOHN L. GWYN
   ---------------------------------------
Name: John L. Gwyn
     -------------------------------------
Title: Senior Vice President - Operations
      ------------------------------------

CASTLE TOWER CORPORATION (PR)



By: /s/ JOHN L. GWYN
   ---------------------------------------
Name: John L. Gwyn
     -------------------------------------
Title: Senior Vice President - Operations
      ------------------------------------

BANKS:

KEYBANK NATIONAL ASSOCIATION



By: /s/ KENNETH J. KEELER
   ---------------------------------------
   Kenneth J. Keeler
   Vice President

WELLS FARGO BANK (TEXAS),
NATIONAL ASSOCIATION



By: /s/ BENNETT D. DOUGLAS
   ---------------------------------------
   Bennett D. Douglas
   Vice President

AGENT:

KEYBANK NATIONAL ASSOCIATION



By: /s/ KENNETH J. KEELER
   ---------------------------------------
   Kenneth J. Keeler
   Vice President


                                      -4-

<PAGE>
 
                                                                    Exhibit 10.6

                       FOURTH AMENDMENT TO LOAN AGREEMENT


                                  by and among

                          CASTLE TOWER CORPORATION and

                         CASTLE TOWER CORPORATION (PR),

                               as the Borrowers,

                        KEYBANK NATIONAL ASSOCIATION and

                        PNC BANK, NATIONAL ASSOCIATION,

                                  as Arrangers

                                      and

                    THE FINANCIAL INSTITUTIONS LISTED HEREIN

                             AS OF OCTOBER 31, 1997
<PAGE>
 
                       FOURTH AMENDMENT TO LOAN AGREEMENT


          This FOURTH AMENDMENT TO LOAN AGREEMENT is made and entered into as of
October 31, 1997, by and among CASTLE TOWER CORPORATION, a Delaware corporation
("CTC-Del"), CASTLE TOWER CORPORATION (PR), a Puerto Rico corporation ("CTC-PR"
and, together with CTC-Del, collectively, the "Borrowers" and individually, a
"Borrower"), the FINANCIAL INSTITUTIONS listed on the signature pages hereof,
KEYBANK NATIONAL ASSOCIATION (formerly known as "Society National Bank"), as
Arranger and agent (the "Agent"), and PNC BANK, NATIONAL ASSOCIATION, as
Arranger (the "Arranger").

                                    RECITALS
                                    --------

          A.  CTC-Del, CTC-PR, the Agent and the Banks entered into a Loan
Agreement dated as of April 26, 1995, as amended by the First Amendment to Loan
Agreement dated as of June 26, 1996, the Second Amendment to Loan Agreement
dated as of January 17, 1997, and the Third Amendment to Loan Agreement dated as
of April 3, 1997 (as so amended, the "Original Agreement"), pursuant to which
the Banks agreed to make available to the Borrowers loans of up to $49,000,000.
The Original Agreement, as amended hereby, may be referred to hereinafter as the
"Loan Agreement." Capitalized terms used herein and not otherwise defined shall
have the meanings assigned to them in the Loan Agreement.

          B.  The Borrowers desire to increase the amount of the Reducing
Commitment to $100,000,000, to terminate the Working Capital Commitment, to
revise the amortization schedule, to revise certain of the financial covenants
and to make certain other changes in the Original Agreement.  Subject to the
terms and conditions of this Amendment, the Agent and the Banks have agreed to
such requests.

          C.  The Arranger desires to be added to the Original Agreement as a
Bank, having an initial Ratable Share of 50%.


                                   AGREEMENTS
                                   ----------

          In consideration of the foregoing Recitals and of the covenants and
representations contained herein, and for other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the Borrowers, the
Agent, the Arranger and the Banks agree as follows:
<PAGE>
 
          1.   Working Capital Loans.  On the effective date of this Fourth
               ---------------------                                       
Amendment, (a) all Working Capital Loans outstanding as of such date shall be
converted into Reducing Loans and shall be subject thereafter to all of the
terms and conditions of the Original Agreement as amended hereby relating to
Reducing Loans, and (b) the Working Capital Commitment shall be terminated.

          2.   Amendments.  Subject to the satisfaction of the conditions set
               ----------                                                    
forth in Section 3 of this Amendment, the Original Agreement shall be amended as
follows:

               (a) Section 1.1 shall be amended by deleting therefrom the
following definitions: "Acquisition Advance Worksheet," "Adjusted Leverage
Ratio," "Adjusted Total Debt," "Annualized Operating Cash Flow," "Corporate
Development Expense," "Deferred Interest," "Division A Acquisition," and
"Division B Acquisition."

               (b) Section 1.1 shall be amended by adding thereto the following
new definitions in the proper alphabetical order:

               "Applicable Percentage" means, as of any date of determination,
                ---------------------                                         
          the percentage determined from the following table based upon the
          Leverage Ratio:
<TABLE>
<CAPTION>
 
          Leverage Ratio:                 Applicable Percentage:
          --------------                  ---------------------
          <S>                             <C>
          Greater than or                          50%
           equal to 5.0:1.0

          Less than 5.0:1.0                         0%;
</TABLE>
          provided, however, that the Applicable Percentage shall be 100% if at
          --------  -------        
          the time of determination a Possible Default or Event of Default
          exists.

               "Fee Letter" means the letter agreement among the Agent, the 
                ----------  
          Arranger and the Borrowers dated as of the date of the Fourth
          Amendment regarding certain fees.

               "Fourth Amendment" means the Fourth Amendment to Loan Agreement
                ----------------                                              
          dated as of October 31, 1997, among the Borrowers, the Agent, the
          Arranger and the Banks.

               "Holdco Affiliates" means collectively Crown Communication Inc.,
                -----------------                                              
          a Delaware corporation, Crown Mobile Systems, Inc., a Pennsylvania
          corporation, Crown Network Systems, Inc., a Pennsylvania corporation,

                                      -2-
<PAGE>
 
          Telestructures, Inc., a Georgia corporation, and TEA Group,
          Incorporated, a Georgia corporation.

               "Issuing Bank" means KeyBank National Association in its capacity
                ------------                                                    
          as the issuer of the Letters of Credit, or any successor issuer of the
          Letters of Credit.

               "Second Amendment" means the Second Amendment to Loan Agreement
                ----------------                                              
          dated as of January 17, 1997, among the Borrowers, the Agent and the
          Banks.

               "Test Operating Cash Flow" means, as of any date, the sum of (a)
                ------------------------                                       
          Operating Cash Flow for the four quarter period then ended or then
          most recently ended less that portion of such Operating Cash Flow
          which is attributable to the leasing or licensing of space on Towers,
          and (b) the product of four times that portion of Operating Cash Flow
          for the quarter then ended or most recently ended which is
          attributable to the leasing or licensing of space on Towers.

               "Third Amendment" means the Third Amendment to Loan Agreement
                ---------------                                             
          dated as of April 3, 1997, among the Borrowers, the Agent and the
          Banks.

                (c) The definition of the terms "Applicable Margin," "Asset
Sale," "Banks," "Debt Service," "Default Interest Rate," "Excess Cash Flow,"
"Fixed Charge Coverage Ratio," "Historical Fixed Charges," "Interest Expense,"
"Leverage Ratio," "Loans," Majority Banks," "Net Earnings," "Notes," "Operating
Cash Flow," "Projected Debt Service," "Ratable Share," "Subsidiary,"
"Termination Date," "Total Debt," "Towers" and "Working Capital" in Section 1.1
shall be amended in their entirety to read as follows:

               "Applicable Margin" means, as of any date of determination, the
                -----------------                                             
          percentage determined from the following table based upon the ratio of
          Total Debt as of such date to Operating Cash Flow for the four quarter
          period then ended or then most recently ended:

                                      -3-
<PAGE>
 
<TABLE>
<CAPTION>
 
          Leverage         Applicable   Applicable
          Ratio:           Margin for   Margin for
          -----            Base Rate    LIBOR Loans:
                           Loans:       -------------
                           -----
          <S>              <C>          <C>
          Greater than      1.500%       3.250%
          6.5:1.0                      

          Greater than      1.250%       2.750%
          6.0:1.0 but                  
          less than or                 
          equal to                     
          6.5:1.0                      

          Greater than      1.000%       2.250%
          5.5:1.0 but                  
          less than or                 
          equal to                     
          6.0:1.0                      

          Greater than      0.875%       2.125%
          5.0:1.0 but                  
          less than or                 
          equal to                     
          5.5:1.0                      

          Greater than      0.625%       1.875%
          4.5:1.0 but                  
          less than or                 
          equal to                     
          5.0:1.0                      

          Greater than      0.375%       1.625%
          4.0:1.0 but                  
          less than or                 
          equal to                     
          4.5:1.0                      

          Greater than      0.000%       1.250%
          3.5:1.0 but                  
          less than or                 
          equal to                     
          4.0:1.0                      

          Less than or      0.000%       1.000%
          equal to
          3.5:1.0
</TABLE>

               "Asset Sale" means the sale by either Borrower, any Holdco 
                ----------     
          Affiliate or any of their respective 

                                      -4-
<PAGE>
 
          Subsidiaries to any Person of any assets of such Borrower, Holdco
          Affiliate or Subsidiary, other than (i) the sale of assets with an
          aggregate value which does not exceed in any fiscal year an amount
          equal to $500,000 and (ii) the sale in the ordinary course of business
          of assets held for resale in the ordinary course of business or the
          trade in or replacement of assets in the ordinary course of business
          or the disposition of any asset which, in the good faith exercise of
          its business judgment, such Borrower, Holdco Affiliate or Subsidiary
          determines is no longer useful in the conduct of its business.

               "Banks" means the financial institutions listed on the signature
                -----                                                          
          pages of this Agreement and their respective successors and assigns;
          the term "Banks" shall include the Issuing Bank.

               "Debt Service" means, for any period, the sum of (a) all
                ------------                                           
          scheduled Reducing Commitment reductions under Section 2.1(b) during
          such period, (b) all principal payments required to be made by the
          Borrowers, the Holdco Affiliates and their respective Subsidiaries on
          Total Debt, other than the Loans, but including, without limitation,
          the PCI Debt, Seller Debt and Capitalized Lease Obligations, during
          such period, and (c) all cash interest payments on, and fees in
          respect of, Total Debt, and all fees in respect of the Letters of
          Credit, required to be made by the Borrowers, the Holdco Affiliates
          and their respective Subsidiaries during such period.

               "Default Interest Rate" means a rate of interest equal to the sum
                ---------------------                                           
          of the Base Rate plus 3.5% per annum.

               "Excess Cash Flow" means, as of any date of determination,
                ----------------                                         
          Operating Cash Flow for the four quarter period then most recently
          ended less the sum (without duplication) of (a) all Debt Service
          payments made by the Borrowers, the Holdco Affiliates and their
          Subsidiaries in such period, (b) income taxes paid by the Borrowers,
          the Holdco Affiliates and their Subsidiaries in such period, (c)
          Capital Expenditures, excluding proceeds of casualty insurance
          policies reasonably and promptly applied to replace insured assets,
          paid in cash by the Borrowers, the Holdco Affiliates and their
          Subsidiaries during such fiscal year to the extent permitted pursuant
          to Section 8.7, (d) Capitalized Lease Obligation payments made by the
          Borrowers, the Holdco Affiliates and their Subsidiaries 

                                      -5-
<PAGE>
 
          during such period to the extent permitted pursuant to Section 8.6,
          and (e) the excess, if any, in Working Capital of the Borrowers, the
          Holdco Affiliates and their respective Subsidiaries as of the end of
          such fiscal year over the Working Capital of the Borrowers, the Holdco
          Affiliates and their respective Subsidiaries as of the end of the
          prior fiscal year.

               "Fixed Charge Coverage Ratio" means, as of any date of
                ---------------------------                          
          determination, the ratio of Operating Cash Flow for the four quarter
          period then ended or most recently ended as of such date to Historical
          Fixed Charges as of such date.

               "Historical Fixed Charges" means, as of any date of
                ------------------------                          
          determination, the sum (without duplication) of the aggregate amount
          of (a) all scheduled Reducing Commitment reductions during the four
          quarter period then ended or most recently ended, (b) all Debt Service
          payments made by the Borrowers, the Holdco Affiliates and their
          respective Subsidiaries during such four quarter period, (c) Capital
          Expenditures made by the Borrowers, the Holdco Affiliates and their
          respective Subsidiaries during such four quarter period, (d) income
          taxes paid by the Borrowers, the Holdco Affiliates and their
          respective Subsidiaries during such four quarter period and (e)
          Capital Distributions made by CTC-Del during such four quarter period.

               "Interest Expense" means, for any period, the gross interest
                ----------------                                           
          expense accrued by the Borrowers, the Holdco Affiliates and their
          respective Subsidiaries in respect of their Indebtedness for such
          period, determined on a consolidated basis, all fees payable under
          Section 2.6 or the Fee Letter and any other fees, charges, commissions
          and discounts in respect of Indebtedness, including fees payable in
          connection with the Letters of Credit.  For purposes of the foregoing,
          gross interest expense shall be determined after giving effect to any
          net payments made or received by the Borrowers with respect to Rate
          Hedging Obligations.

               "Leverage Ratio" means, as of any date of determination, the
                --------------                                             
          ratio of Total Debt as of such date to Test Operating Cash Flow as of
          such date.

               "Loans" means the Reducing Loans and all amounts drawn under any
                -----                                                          
          Letter of Credit (which amounts shall be deemed to be Reducing Loans)
          and not repaid.

                                      -6-
<PAGE>
 
               "Majority Banks" means, at any time, Banks holding at least 51%
                --------------                                                
          of the then aggregate unpaid principal amount of the Notes and the
          face amount of the outstanding Letters of Credit, or, if no principal
          amount of the Notes or any Letter of Credit is then outstanding, Banks
          having at least 51% of the Reducing Commitment.

               "Net Earnings" means the combined net income (or deficit) of the
                ------------                                                   
          Borrowers, the Holdco Affiliates and their Subsidiaries for the period
          involved, after taxes, if any, and after all proper charges and
          reserves (excluding, however, Extraordinary Items), all as determined
          in accordance with GAAP.

               "Notes" means the Reducing Notes and any notes issued in
                -----                                                  
          connection with the issuance of a Letter of Credit.

               "Operating Cash Flow" means, during any period, Net Earnings for
                -------------------                                            
          such period (excluding, to the extent included in Net Earnings, any
          Extraordinary Items and the effect of any exchange of space on a Tower
          for non-cash consideration, such as merchandise or services), minus
                                                                        -----
          the sum of any interest and other investment income of the Borrowers,
          the Holdco Affiliates and their Subsidiaries during such period, plus
                                                                           ----
          the sum of, without duplication, (a) depreciation on or obsolescence
          of fixed or capital assets and amortization of intangibles and
          leasehold improvements of the Borrowers, the Holdco Affiliates and
          their Subsidiaries for such period, plus (b) any amounts paid by the
                                              ----                            
          Borrowers, the Holdco Affiliates and their Subsidiaries in such period
          in respect of Rate Hedging Obligations to the extent such amounts were
          deducted in calculating Net Earnings, plus (c) cash interest accrued
                                                ----                          
          and paid by the Borrowers, the Holdco Affiliates and their
          Subsidiaries during such period, plus (d) federal and state income
                                           ----                             
          taxes accrued and paid by the Borrowers, the Holdco Affiliates and
          their Subsidiaries during such period (exclusive of any such taxes
          resulting from any Extraordinary Items), plus (e) non-recurring costs
                                                   ----                        
          paid by the Borrowers, the Holdco Affiliates and their Subsidiaries in
          such period in connection with Qualified Acquisitions and approved by
          the Agent, to the extent that such costs were paid from equity
          contributions or the proceeds of any Loan.  For purposes of
          calculating Operating Cash Flow for any period, each Qualified
          Acquisition and each sale or other disposition of any Towers and
          related assets, 

                                      -7-
<PAGE>
 
          whether by sale of stock or assets, which occurs during such period,
          shall be deemed to have occurred on the first day of such period;
          accordingly, the operating cash flow received by the seller of the
          Towers and related assets, or of a management agreement in respect
          thereof, acquired pursuant to each Qualified Acquisition shall be
          included for the entire period and the Operating Cash Flow relating to
          any Towers and related assets, or of a management agreement in respect
          thereof, sold or otherwise disposed of during such period shall be
          excluded from the calculation of Operating Cash Flow for the entire
          period.

               "Projected Debt Service" means, as of any date of determination,
                ----------------------                                         
          the sum of (a) all scheduled Reducing Commitment reductions under
          Section 2.1(b) during the four quarter period following the end of the
          fiscal quarter then most recently ended, (b) all principal payments
          required to be made by the Borrowers, the Holdco Affiliates and their
          respective Subsidiaries on Total Debt, other than the Loans, but
          including, without limitation, the PCI Debt, Seller Debt and
          Capitalized Lease Obligations, during such subsequent four quarter
          period, and (c) all cash interest payments and payments of fees on
          Total Debt required to be made by the Borrowers, the Holdco Affiliates
          and their respective Subsidiaries during such subsequent four quarter
          period.  In calculating Projected Debt Service, (i) the interest rate
          applicable during such subsequent four quarter period to any
          Indebtedness which does not bear interest at a rate which is fixed
          (either by its terms or pursuant to an agreement regarding Rate
          Hedging Obligations) for the entire subsequent period shall be deemed
          to be the interest rate in effect as of the date of determination, and
          (ii) it shall be assumed that the principal amount of Loans
          outstanding as of the date of determination will be outstanding for
          the subsequent four quarter period subject to any required commitment
          reductions.

               "Ratable Share" means, with respect to any Bank, its pro rata
                -------------                                               
          share of the Reducing Commitment, the Letters of Credit or the Loans.
          The Ratable Shares of the Banks as of the effective date of the Fourth
          Amendment shall be as listed on Schedule 1 to the Fourth Amendment.

               "Subsidiary" means each existing or future partnership,
                ----------                                            
          corporation or limited liability company, the majority of the
          outstanding partnership interests, 

                                      -8-
<PAGE>
 
          capital stock or voting power of which is (or upon the exercise of all
          outstanding warrants, options and other rights would be) owned,
          directly or indirectly, at the time in question by a Borrower or a
          Holdco Affiliate.

               "Termination Date" means December 31, 2004.
                ----------------                          

               "Total Debt" means, without duplication, all Indebtedness of the
                ----------                                                     
          Borrowers, the Holdco Affiliates and their respective Subsidiaries for
          borrowed money, including the Loans, all Capitalized Lease Obligations
          of the Borrowers, the Holdco Affiliates and their Subsidiaries, all
          other Indebtedness of the Borrowers, the Holdco Affiliates and their
          Subsidiaries represented by notes or drafts representing extensions of
          credit for borrowed money, all other Indebtedness of other Persons for
          which either Borrower, any Holdco Affiliate or any of their
          Subsidiaries is a Guarantor, all obligations of the Borrowers, the
          Holdco Affiliates and their Subsidiaries evidenced by bonds,
          debentures, notes or other similar instruments (including all such
          obligations to which any property or asset owned by a Borrower, Holdco
          Affiliate or Subsidiary is subject, whether or not the obligation
          secured thereby shall have been assumed) and all obligations of either
          Borrower, any Holdco Affiliate or any Subsidiary as an account party
          to reimburse any bank or any other Person in respect of letters of
          credit (other than the Letters of Credit) or bankers' acceptances.

               "Towers" means the wireless communications towers owned or leased
                ------                                                          
          by the Borrowers, the Holdco Affiliates and their Subsidiaries or
          which are subject to a management agreement to which either Borrower,
          a Holdco Affiliate or a Subsidiary is a party and which a Borrower or
          such Holdco Affiliate or such Subsidiary has obtained pursuant to a
          Qualified Acquisition, and "Tower" means each of such Towers.

               "Working Capital" means, as of any date, the excess of the
                ---------------                                          
          Borrowers', the Holdco Affiliates' and their Subsidiaries' combined
          current assets, other than cash, over their combined current
          liabilities, other than the current portion of long term debt, as of
          such date.

               (d) Sections 2.1(a), (b), (c) and (d) shall be amended in their
entirety to read as follows:

                                      -9-
<PAGE>
 
                2.1  The Reducing Commitment and the Reducing Loans.
                     ---------------------------------------------- 

                     (a)  Subject to the terms and conditions hereof, during the
          period from the Closing Date up to but not including the Termination
          Date, the Banks severally, but not jointly, shall make loans to the
          Borrowers in such amounts as the Borrowers may from time to time
          request but not exceeding in aggregate principal amount at any one
          time outstanding $100,000,000 (as such amount may be reduced from time
          to time, the "Reducing Commitment"); provided, however, that in no
                                               --------  -------            
          event shall the aggregate principal amount of such loans plus the
          aggregate stated amount of the Letters of Credit exceed the Reducing
          Commitment.  All amounts borrowed by the Borrowers pursuant to this
          Section 2.1(a) and all amounts drawn under any Letter of Credit and
          not repaid may be referred to hereinafter collectively as the
          "Reducing Loans."  Each Reducing Loan requested by the Borrowers shall
          be funded by the Banks in accordance with their Ratable Shares of the
          requested Reducing Loan.  A Bank shall not be obligated hereunder to
          make any additional Reducing Loan if immediately after making such
          Reducing Loan, the aggregate principal balance of all Reducing Loans
          made by such Bank plus such Bank's Ratable Share of any outstanding
          Letters of Credit would exceed such Bank's Ratable Share of the
          Reducing Commitment.  The Reducing Loans may be comprised of Base Rate
          Loans or LIBOR Loans, as provided in Section 2.4.

                     (b)  On each date set forth in the table below, the
          Reducing Commitment shall automatically reduce by the amount set forth
          for such date in such table:

<TABLE>
<CAPTION>
          =========================================================== 
          Calendar    March 31    June 30    September    December
          Year                                  30          31
          <S>         <C>         <C>         <C>         <C>
          2001        $5,000,000  $5,000,000  $5,000,000  $5,000,000
          -----------------------------------------------------------
          2002        $5,000,000  $5,000,000  $5,000,000  $5,000,000
          -----------------------------------------------------------
          2003        $5,000,000  $5,000,000  $5,000,000  $5,000,000
          -----------------------------------------------------------
          2004        $5,000,000  $5,000,000  $5,000,000  all
                                                          remaining
                                                          principal
          ===========================================================
</TABLE>

                                      -10-
<PAGE>
 
                    (c)  Prior to the Termination Date, the Borrowers may, at
          their option, from time to time prepay all or any portion of the
          Reducing Loans, subject to the provisions of Section 2.7, and the
          Borrowers may reborrow from time to time hereunder amounts so paid up
          to the amount of the Reducing Commitment in effect at the time of
          reborrowing.

                    (d)  Letters of Credit.
                         ----------------- 

                         (i)  Issuance.  Subject to the terms and conditions 
                              --------   
          hereof, including the provisions of Section 6, the Borrowers may
          request that the Issuing Bank issue, from time to time, and the
          Issuing Bank agrees to issue, from time to time, letters of credit in
          an aggregate stated amount not exceeding $5,000,000 (the "Letters of
          Credit"). No Letter of Credit shall be issued for a term of more than
          three hundred sixty-four days, and no Letter of Credit shall have an
          expiration date which is later than the Termination Date. No Letter of
          Credit shall be issued if after giving effect to such issuance, the
          sum of the outstanding principal balance of the Reducing Loans
          (including amounts drawn on Letters of Credit and not repaid), plus
          the aggregate stated amount of outstanding Letters of Credit, would
          exceed the Reducing Commitment. Each Letter of Credit shall be issued
          in the manner and on the conditions set forth in this Section 2.1(d)
          and Section 6. Each Letter of Credit shall be in the Issuing Bank's
          standard form for letters of credit or in such other form as is
          acceptable to the Issuing Bank in form and substance.

                         (ii)  Application.  Each request for a Letter of Credit
                               -----------                                      
          shall be made to the Issuing Bank by an application on the Issuing
          Bank's standard form or in such other manner as the Issuing Bank may
          approve. Promptly following the issuance of any Letter of Credit, the
          Issuing Bank shall notify the Agent and the Banks of such issuance.

                         (iii)  Participation by the Banks.
                                -------------------------- 

                                (A)  By the issuance of a Letter of Credit and
          without any further action on the part of the Issuing Bank, the Agent
          or the other Banks in respect thereof, the Issuing Bank hereby grants
          to each other Bank, and each other Bank hereby agrees to acquire from
          the Issuing Bank, a participation in such Letter of Credit equal to
          such Bank's Ratable Share of 

                                      -11-
<PAGE>
 
          the stated amount of such Letter of Credit, effective upon the
          issuance of such Letter of Credit; provided, however, that no Bank 
                                             --------  -------         
          shall be required to acquire participations in any Letter of Credit
          that would result in its Ratable Share of the sum of outstanding
          Reducing Loans plus the stated amount of all outstanding Letters of
          Credit to be greater than its Ratable Share of the Reducing
          Commitment. In consideration and in furtherance of the foregoing, each
          Bank hereby absolutely and unconditionally agrees to pay to the Agent,
          for the account of the Issuing Bank, in accordance with Section
          2.1(d)(iv), such Bank's Ratable Share of each amount disbursed
          pursuant to a Letter of Credit; provided, that payment by the Issuing
                                          -------- 
          Bank under such Letter of Credit against presentation of such draft 
          or document shall not have constituted gross negligence or willful
          misconduct of the Issuing Bank.

                                (B)  Each Bank acknowledges and agrees that its
          obligation to acquire participations pursuant to paragraph (A) above
          in respect of Letters of Credit is absolute and unconditional and
          shall not be affected by any circumstances whatsoever, including the
          occurrence and continuance of an Event of Default or Possible Default,
          and that each such payment shall be made without any offset,
          abatement, withholding or reduction whatsoever.

                    (iv)  Letter of Credit Disbursements.
                          ------------------------------ 

                          (A)  If the Agent has not received from the Borrowers
          the payment permitted pursuant to paragraph (B) of this Section
          2.1(d)(iv) by 11:00 a.m., Cleveland time, on the date on which the
          Issuing Bank has notified the Borrowers that payment of a draft
          presented under any Letter of Credit will be made, as provided in such
          paragraph (B), the Agent shall promptly notify the Issuing Bank and
          each other Bank of the disbursement to be made under such Letter of
          Credit and, in the case of each Bank, its Ratable Share of such
          disbursement. Each Bank shall pay to the Agent, not later than 1:00
          P.M., Cleveland time, on such date (or, if the Issuing Bank shall
          elect to defer reimbursement from the Banks hereunder, such later date
          as the Issuing Bank shall specify by notice to the Agent and the
          Banks), such Bank's Ratable Share of such disbursement, which the
          Agent shall promptly pay to the Issuing Bank. The Agent will promptly
          remit to each Bank its share of any amount subsequently received by

                                      -12-
<PAGE>
 
          the Agent from the Borrowers in respect of such disbursement; provided
                                                                        --------
          that amounts so received for the account of any Bank prior to payment
          by such Bank of amounts required to be paid by it hereunder in respect
          of any disbursement shall be remitted to the Issuing Bank.

                                (B)  If the Issuing Bank shall receive any draft
          presented under any Letter of Credit, the Issuing Bank shall give
          notice thereof as provided in paragraph (C) below. If the Issuing Bank
          shall pay any draft presented under a Letter of Credit, the Borrowers
          may (but shall not be required to) pay to the Agent, for the account
          of the Issuing Bank, an amount equal to the amount of such draft
          before 11:00 A.M., Cleveland time, on the Banking Day on which the
          Issuing Bank shall have notified the Borrowers that payment of such
          draft will be made. The Agent will promptly pay any such amounts
          received by it to the Issuing Bank.

                                (C)  The Issuing Bank shall, promptly following
          its receipt thereof, examine all documents purporting to represent a
          demand for payment under a Letter of Credit to ascertain that the same
          appear on their face to be in substantial conformity with the terms
          and conditions of such Letter of Credit. The Issuing Bank shall as
          promptly as reasonably practicable give oral notification, confirmed
          in writing, to the Agent and the Borrowers of such demand for payment
          and the determination by the Issuing Bank as to whether such demand
          for payment was in accordance with the terms and conditions of such
          Letter of Credit and whether the Issuing Bank has made or will make a
          disbursement thereunder, provided that the failure to give such notice
          shall not relieve the Borrowers of their obligation to reimburse such
          disbursement, and the Agent shall promptly give each Bank notice
          thereof.

                                (D)  Any amounts paid by the Issuing Bank on any
          Letter of Credit shall be deemed to be a Reducing Loan for all
          purposes of this Agreement and shall bear interest from the date of
          payment by the Issuing Bank at the rates provided in Section 3.1 until
          paid in full.

                           (v)  Obligation to Repay Letter of Credit 
                                ------------------------------------
          Disbursements, etc.  The Borrowers assume all risks in connection 
          ------------------
          with the Letters of Credit and the Borrowers' obligation to repay each
          disbursement under a Letter of Credit shall be absolute, unconditional
          and  

                                      -13-
<PAGE>
 
          irrevocable under any and all circumstances and irrespective of:

                                (A)  any lack of validity or enforceability of
          any Letter of Credit;

                                (B)  the existence of any claim, setoff, defense
          or other right which the Borrowers or any other person may at any time
          have against the beneficiary under any Letter of Credit, the Agent,
          the Issuing Bank or any other Bank (other than the defense of payment
          in accordance with the terms of this Agreement or a defense based on
          the gross negligence or willful misconduct of the Issuing Bank) or any
          other Person in connection with this Agreement or any other agreement
          or transaction;

                                (C)  any draft or other document presented under
          a Letter of Credit proving to be forged, fraudulent, invalid or
          insufficient in any respect or any statement therein being untrue or
          inaccurate in any respect; and

                                (D)  any other circumstance or event whatsoever,
          whether or not similar to any of the foregoing.

               It is understood that in making any payment under a Letter of
          Credit (I) the Issuing Bank's exclusive reliance as to any and all
          matters set forth therein, including reliance on the amount of any
          draft presented under such Letter of Credit, whether or not the amount
          due to the beneficiary equals the amount of such draft and whether or
          not any documents presented pursuant to such Letter of Credit prove to
          be insufficient in any respect, if such document on its face appears
          to be in order, and whether or not any such Letter of Credit proves to
          be forged or invalid or any statement therein proves to be inaccurate
          or untrue in any respect whatsoever and (II) any noncompliance in any
          immaterial respect of the documents presented under a Letter of Credit
          with the terms thereof, shall, in each case, not be deemed willful
          misconduct or gross negligence of the Issuing Bank.

                    (vi)  Indemnification.  The Borrowers jointly and severally
                          ---------------                                      
          shall: (A) indemnify and hold the Agent and each Bank (including the
          Issuing Bank) harmless from any loss resulting from any claim, demand
          or liability which may be asserted against the Agent or



                                     -14-
<PAGE>
 
          such Bank in connection with actions taken under any Letter of Credit,
          and (B) reimburse the Agent or such Bank for any fees or other
          reasonable expenses paid or incurred by the Agent or such Bank in
          connection with any Letter of Credit, other than any loss or expense
          resulting from the Agent's or such Bank's willful misconduct or gross
          negligence.

                    (vii)   Security.  Upon the occurrence of any Event of
                            --------                                      
          Default, the Borrowers shall, upon demand, pay to the Issuing Bank the
          stated amount of all outstanding Letters of Credit, which amount the
          Issuing Bank shall hold as security for the obligations incurred under
          the Letters of Credit, this Agreement and the Notes.  The payment by
          the Borrowers of such security shall not terminate the obligations of
          the Borrowers under this Section 2.1(d).

                    (viii)  Additional Costs.  If any Regulatory Change shall
                            ----------------                                 
          either (A) impose upon, modify, require, make or deem applicable to
          the Issuing Bank, the Agent or any Bank (or its holding company) any
          reserve requirement, special deposit requirement, insurance assessment
          or similar requirement against or affecting any Letter of Credit
          issued or to be issued hereunder, or (B) subject the Issuing Bank, the
          Agent or any Bank to any tax, charge, fee, deduction or withholding of
          any kind whatsoever, or (C) impose any condition upon or cause in any
          manner the addition of any supplement to or increase of any kind to
          the Issuing Bank's, the Agent's or any Bank's (or its holding
          company's) capital or cost base for issuing such Letter of Credit
          which results in an increase in the capital requirement supporting
          such Letter of Credit, or (D) impose upon, modify, require, make or
          deem applicable to the Issuing Bank, the Agent or any Bank (or its
          holding company) any capital requirement, increased capital
          requirement or similar requirement such as the deeming of such Letters
          of Credit to be assets held by the Issuing Bank, the Agent or such
          Bank (or its holding company) for capital calculation or other
          purposes and the result of any events referred to in (A), (B), (C) or
          (D) above shall be to increase the costs or decrease the benefit in
          any way to the Issuing Bank, the Agent or a Bank (or its holding
          company) of issuing, maintaining or participating in such Letters of
          Credit, then and in such event the Borrowers shall, within ten days
          after the mailing of written notice of such increased costs and/or
          decreased benefits to the Agent and the Borrowers, pay to the Issuing
          Bank, the Agent 

                                      -15-
<PAGE>
 
          or such Bank all such additional amounts which in the Issuing Bank's,
          the Agent's or such Bank's sole good faith calculation as allocated to
          such Letters of Credit, shall be sufficient to compensate it (or its
          holding company) for all such increased costs and/or decreased
          benefits. The Issuing Bank's, the Agent's or such Bank's calculation
          shall be conclusive absent manifest error.

                    (ix)  Fees.  Each Letter of Credit shall be issued for a fee
                          ----                                                  
          equal to the product of the Applicable Margin applicable to LIBOR
          Loans as of the date of issuance thereof times the stated amount
          thereof, payable upon issuance.  The fee shall be payable to the Agent
          for the benefit of the Banks in accordance with their Ratable Shares.
          If any Letter of Credit is drawn upon prior to its expiration date,
          the Banks shall reimburse to the Borrowers that portion of the fee
          allocable to the period from the date of the draw to the expiration
          date, calculated in accordance with the Issuing Bank's standard letter
          of credit procedures. In addition, the Borrowers shall pay to the
          Issuing Bank for its own account its standard charges for the issuance
          of letters of credit and for draws upon letters of credit, which
          charges, as of the date hereof, are as follows:  (i) $200 per Letter
          of Credit, payable upon issuance and (ii) $100 per Letter of Credit,
          payable upon a draw under such Letter of Credit.

                (e) Section 2.4 shall be amended by deleting Section 2.4(d) in
its entirety.

                (f) Section 2.6 shall be amended in its entirety to read as
follows:

                2.6  Fees.
                     ---- 

                     (a)  Commitment Fees.  The Borrowers shall pay to the Agent
                          ---------------                                       
          for the benefit of the Banks a non-refundable commitment fee of 1/2%
          per annum (based on a year having 360 days and actual days elapsed) on
          the excess of the aggregate average daily undisbursed amount of the
          Reducing Commitment over the aggregate stated amount of the Letters of
          Credit then outstanding; provided, however, that the commitment fee
                                   --------  -------                         
          shall be 1/4% per annum for any day on which the Leverage Ratio is
          less than or equal to 3.5 to 1.0. Such commitment fee shall (i)
          commence to accrue as of the date hereof and continue for each day to
          and   

                                      -16-
<PAGE>
 
          including the Termination Date, (ii) be in addition to any other
          fee required by the terms and conditions of this Agreement, (iii) be
          payable quarterly in arrears on each Quarterly Date and on the date
          the Reducing Commitment is terminated, and (iv) be shared by the Banks
          in accordance with their Ratable Shares.

                     (b)  Other Fees.  The Borrowers shall pay to the Agent and
                          ----------                                           
          the Arranger such other fees as are set forth in the Fee Letter.

                (g)  Section 2.7(b)(ii) shall be amended in its entirety to read
as follows:

                          (ii)  Excess Cash Flow.  Within one hundred twenty 
                                ----------------     
          days after the end of each fiscal year of the Borrowers, commencing
          with the fiscal year ending on December 31, 2000, the Borrowers shall
          make a mandatory prepayment of the Loans in an amount equal to the
          Applicable Percentage of Excess Cash Flow, if any, for such fiscal
          year. Mandatory prepayments made pursuant to this Section 2.7(b)(ii)
          shall be determined from the annual financial statements for such
          fiscal year delivered by the Borrowers pursuant to Section 7.5(a) and
          shall be accompanied by a certificate signed by each Borrower's chief
          financial officer setting forth the calculations from which the amount
          of such prepayment was determined.

               (h) Section 2.7(b)(v) shall be amended in its entirety to read as
follows:

               (v) Net Equity and Debt Proceeds.  If CTC-Del receives any
                   ----------------------------                          
          capital contribution from Holdco which Holdco is required to make to
          CTC-Del pursuant to the Amended and Restated Holdco Guaranty, it
          shall, within five days of receipt of such capital contribution, make
          a mandatory prepayment of the Loans in an amount equal to such capital
          contribution; provided, however, that if, as of the date of such
                        --------  -------                                 
          capital contribution, (A) the Leverage Ratio is less than 6.0 to 1.0
          and (B) either Borrower is a party to a legally binding acquisition
          agreement for a Qualified Acquisition permitted pursuant to Section
          8.10(b), then the Borrowers may use the proceeds of such capital
          contribution to pay the purchase price of such Qualified Acquisition.

               (i) Section 2.7(c) shall be amended in its entirety to read as
follows:

               

                                      -17-
<PAGE>
 
               (c)  Application of Prepayments.
                    -------------------------- 

                    (i)  Application to Accrued Interest.  All prepayments made
                         -------------------------------                       
          pursuant to this Section 2.7 shall be applied as follows: first, to
          accrued interest and then to the outstanding principal of the Loans.
          For purposes of the calculation of interest and the determination of
          whether any LIBOR Prepayment Premium is due in connection with any
          such prepayment, such principal prepayments shall be applied first to
          the Base Rate Loans and then to the LIBOR Loans with the shortest
          remaining Interest Periods.

                    (ii)  Application to the Reducing Loans and the Reducing
                          --------------------------------------------------
          Commitment.  Any mandatory prepayment of the Reducing Loans (other
          ----------                                                        
          than pursuant to Section 2.7(b)(i)) shall cause the Reducing
          Commitment to be immediately and automatically reduced by the amount
          of such prepayment, and each such mandatory reduction shall be applied
          to the subsequent Reducing Commitment reductions set forth in Section
          2.1(b) in the inverse order of maturity; provided, however, that any
                                                   --------  -------          
          mandatory prepayment pursuant to Section 2.7(b)(v) made on or before
          December 31, 2000, shall not cause the Reducing Commitment to be
          reduced.

          (j) Sections 3.1(a), (b), (c) and (d) shall be amended in their
entirety to read as follows:

               (a)  Subject to Section 3.1(c), prior to maturity, LIBOR Loans
          shall bear interest at the LIBOR Rate plus the Applicable Margin and
          Base Rate Loans shall bear interest at the Base Rate plus the
          Applicable Margin.

               (b)  The Applicable Margin shall be determined by the Agent
          quarterly, and upon the making of each Loan in an amount in excess of
          $5,000,000, based on the financial statements and the Compliance
          Certificate delivered to the Banks pursuant to Sections 7.5(b) and (d)
          (in the case of a quarterly determination) and the compliance
          certificate delivered pursuant to Section 6.12(b) (in the case of the
          determination of the Applicable Margin upon the making of a Loan).
          Any change in the interest rate on the Loans due to a change in the
          Applicable Margin shall be effective on the fifth Banking Day after
          delivery of such financial statements or compliance certificate;
                                                                          
          provided, however, that if any such quarterly financial statements and
          --------  -------                                                     
          Compliance Certificate indicate an increase in the Applicable Margin
          and such financial

                                      -18-
<PAGE>
 
          statements and certificate are not provided within the time period
          required in Section 7.5(b), the increase in the interest rate due to
          such increase in the Applicable Margin shall be effective
          retroactively as of the fifth Banking Day after the date on which such
          financial statements and certificate were due. The Borrowers shall
          deliver to the Banks with each set of quarterly financial statements
          which indicate a change in the Applicable Margin a notice with respect
          to such change, which notice shall set forth the calculation of, and
          the supporting evidence for, such change.

               (c)  Upon the occurrence of any Event of Default, the entire
          outstanding principal amount of each Loan and (to the extent permitted
          by law) unpaid interest thereon and all other amounts due hereunder
          shall bear interest, from the date of occurrence of such Event of
          Default until the earlier of the date such Loan is paid in full and
          the date on which such Event of Default is cured or waived in writing,
          at the Default Interest Rate which shall be payable upon demand.

               (d)  Interest shall be computed on a Three Hundred Sixty day year
          basis calculated for the actual number of days elapsed.  Interest
          accrued on each Base Rate Loan shall be paid quarterly in arrears on
          each Quarterly Date after the date hereof until such Loan is paid in
          full and on the date such Loan is paid in full, and interest accrued
          on each LIBOR Loan shall be paid on the last day of the Interest
          Period thereof and on the date such Loan is paid in full.

          (k) Section 6.12(b) (as amended by the Second Amendment) shall be
amended by deleting the word "Adjusted" in the fourth line thereof.

          (l) Section 6.14 shall be amended by deleting the last sentence
thereof.

          (m) Section 7.1 shall be amended in its entirety to read as follows:

               7.1  Use of Proceeds.  The Borrowers shall use the proceeds of
                    ---------------                                          
          the Reducing Loans only as follows: (i) to prepay on the effective
          date of the Fourth Amendment the Working Capital Loans; (ii) to make a
          Capital Distribution to Holdco in an amount not to exceed
          [$65,000,000] on the effective date of the Fourth Amendment to be used
          by Holdco (A) to pay the Note dated August 15, 1997, made by Holdco in
          favor of

                                      -19-
<PAGE>
 
          Robert A. Crown and Barbara Crown (the "Crown Note"), and (B) to
          contribute to Crown Communication Inc. to be used by it to pay in full
          all amounts owing to its existing credit facility with PNC Bank,
          National Association; (iii) for Qualified Acquisitions; (iv) for
          Capital Expenditures made pursuant to the last sentence of Section
          8.7, including the construction of communications tower facilities;
          (v) for fees and transaction costs associated with the Fourth
          Amendment; and (vi) for general corporate purposes.

          (n) Section 7.5(b) shall be amended in its entirety to read as
follows:

               (b) As soon as available, but in no event later than forty-five
          days after the end of each quarter of the Borrowers, the Borrowers
          shall furnish unaudited consolidated and consolidating financial
          statements, including consolidated and consolidating balance sheets
          and income statements of the Borrowers and their Subsidiaries, showing
          the financial condition of the Borrowers and their Subsidiaries as of
          the end of such period and the results of their operations during such
          period and for the then elapsed portion of the fiscal year, which
          shall be accompanied by a statement of cash flows of the Borrowers and
          their Subsidiaries for such periods; all such financial statements
          shall set forth, in comparative form, corresponding figures for the
          equivalent period of the prior year and a comparison to budget for the
          relevant period, shall be in form and detail satisfactory to the
          Agent, and shall be certified as to accuracy and completeness by the
          chief financial officer of each Borrower;

          (o) Section 7.13 shall be amended to read in its entirety as follows:

                7.13  Rate Hedging Obligations.  The Borrowers shall within
                      ------------------------                             
          sixty days after the effective date of the Fourth Amendment enter
          into, and shall at all times thereafter maintain in full force and
          effect, agreements in form and substance reasonably satisfactory to
          the Majority Banks regarding Rate Hedging Obligations so that the sum
          of the notional amount subject to such agreements plus the aggregate
          principal amount of all Total Debt plus the principal amount of all
          Indebtedness of Holdco which bears interest at a fixed interest rate
          equals at all times at least 50% of such sum.

                                      -20-
<PAGE>
 
          (p) A new Section 7.17 shall be added to the Loan Agreement which
shall read in its entirety as follows:

               7.17  Maintenance of Separate Identity.  Each Borrower shall (i)
                     --------------------------------                          
          not fail to correct any known misunderstanding regarding its existence
          separate and distinct from Holdco, (ii) maintain its accounts, books
          and records separate from those of Holdco, (iii) not commingle its
          funds or assets with those of Holdco and shall not permit Holdco to
          have direct access to its cash, (iv) hold all of its assets in its own
          name and shall not permit Holdco to acquire or dispose of any assets
          on its behalf, (v) not conduct business in the name of Holdco, (vi)
          not assume or guaranty or otherwise become obligated for the debts of
          Holdco or hold out its credit as being available to satisfy the
          obligations of Holdco, and (vii) allocate fairly and reasonably any
          overhead for office space shared with Holdco and shall use separate
          stationery, invoices and checks from those used by Holdco.

                (q) Section 8.7 shall be amended in its entirety to read as
follows:

               8.7  Capital Expenditures.  Except for (a) Qualified Acquisitions
                    --------------------                                        
          permitted pursuant to Section 8.10(b), (b) the construction of
          communications tower facilities, (c) any payments in respect of
          Capitalized Lease Obligations and (d) expenditures of proceeds of
          casualty insurance policies reasonably and promptly applied to replace
          insured assets, the Borrowers, the Holdco Affiliates and their
          Subsidiaries shall not make Capital Expenditures which exceed the sum
          of (i) [$      ] in the aggregate in 1997, (ii) [$      ] in the
                   ------                                   ------
          aggregate in 1998, (iii) [$      ] in the aggregate in 1999, or (iv)
                                     ------
          [$     ] in the aggregate in any fiscal year thereafter (the amount
            -----
          permitted in any year pursuant to this sentence being referred to as
          the "Base Amount" for such year).  If the Base Amount for any year
          exceeds the aggregate amount of Capital Expenditures actually made by
          the Borrowers, the Holdco Affiliates and their Subsidiaries in such
          year (such excess being referred to as the "Excess Amount"), then the
          Borrowers, the Holdco Affiliates and their Subsidiaries may make
          Capital Expenditures in the immediately succeeding year (but not in
          any year thereafter) in excess of the Base Amount for such succeeding
          year in an amount not to exceed the Excess Amount for the prior year.

        

                                      -21-
<PAGE>
 
                (r) Section 8.9 shall be amended in its entirety to read as
follows:

                    8.9  Capital Distributions.
                         --------------------- 

                         (a)  Neither Borrower shall, and neither Borrower shall
          permit any of its Subsidiaries or any Holdco Affiliate to, make, or
          declare or incur any liability to make, any Capital Distribution,
          except that:

                              (i)  any Subsidiary of a Borrower may make Capital
          Distributions to such Borrower or to a wholly owned Subsidiary of such
          Borrower;

                              (ii) CTC-Del may make Capital Distributions to
          Holdco solely in order to permit Holdco to pay its out-of-pocket costs
          for corporate development and overhead and to pay cash interest
          expense actually incurred by Holdco on Permitted Indebtedness (as that
          term is defined in the Amended and Restated Holdco Guaranty executed
          and delivered by Holdco pursuant to the Fourth Amendment) so long as:
          (A) the aggregate amount of such Capital Distributions does not exceed
          $6,000,000 in any year ending on or prior to the fifth anniversary of
          the effective date of the Fourth Amendment or $28,000,000 in any year
          thereafter; (B) prior to making any such distribution, the Borrowers
          shall have demonstrated to the satisfaction of the Agent that the
          Borrowers will be in compliance with all of the covenants contained
          herein after giving effect to such distribution; (C) no Possible
          Default or Event of Default exists at the time of making such
          distribution or would exist after giving effect thereto; (D) prior to
          making any such distribution, the Borrowers shall have delivered to
          the Agent a certificate of their chief financial officers in form and
          substance satisfactory to the Agent which shall contain calculations
          demonstrating on a pro forma basis the Borrowers' compliance with the
          financial covenants set forth in this Section 8 after giving effect to
          such distribution; and (E) such distributions shall not be made more
          frequently than four times per year; and

                              (iii) CTC-Del may make Capital Distributions to
          Holdco solely in order to permit Holdco to pay that portion of the
          federal, state and local income tax liability (exclusive of penalties
          and interest) of Holdco which arises from the allocation to

                                      -22-
<PAGE>
 
          Holdco for income tax purposes of taxable income and/or taxable gain
          of the Borrowers (not to exceed the actual federal, state and local
          income tax liability of Holdco) so long as: (A) prior to making any
          such distribution, the Borrowers shall have demonstrated to the
          satisfaction of the Agent that the Borrowers will be in compliance
          with all of the covenants contained herein after giving effect to such
          distribution; (B) no Possible Default or Event of Default exists at
          the time of making such distribution or would exist after giving
          effect thereto; (C) prior to making any such distribution, the
          Borrowers shall have delivered to the Agent a certificate of their
          chief financial officers in form and substance satisfactory to the
          Agent which shall contain calculations demonstrating on a pro forma
          basis the Borrowers' compliance with the financial covenants set forth
          in this Section 8 after giving effect to such distribution and the
          calculation of such income tax liability; and (D) such distributions
          shall not be made more frequently than four times per year.

                    (b)  Neither Borrower shall permit any of its Subsidiaries
          or any Holdco Affiliate to agree to or to be subject to any
          restriction on its ability to make Capital Distributions or loans or
          loan repayments or other asset transfers to its stockholders other
          than restrictions imposed by applicable law and the restrictions set
          forth in this Section.

               (s) Section 8.10 shall be amended in its entirety to read as
follows:

               8.10  Disposal of Property; Mergers; Acquisitions;
                      --------------------------------------------
          Reorganizations.
          --------------- 

                    (a)  Except as expressly permitted pursuant to Section
          8.10(b), Section 8.11 or the Fourth Amendment, neither Borrower shall,
          and neither Borrower shall permit any Subsidiary or any Holdco
          Affiliate to, (i) dissolve or liquidate; (ii) sell, lease, transfer or
          otherwise dispose of any material portion of its properties or assets
          to any Person; (iii) be a party to any consolidation, merger,
          recapitalization or other form of reorganization; (iv) make any
          acquisition of all or substantially all the assets of any Person, or
          of a business division or line of business of any Person, or of any
          other assets constituting a going business; (v) create, acquire or
          hold any Subsidiary; or (vi) be or become a party to any joint venture
          or other partnership.

                                      -23-
<PAGE>
 
                    (b)  The Borrowers may make acquisitions of communications
          tower facilities, site management and site acquisition companies and
          related communications and information transmission businesses, either
          by the acquisition of assets or the acquisition of all of the
          outstanding equity interests of entities engaged in such businesses,
          subject to the satisfaction of the following conditions (any such
          acquisition, or series of related acquisitions, which satisfies such
          conditions being referred to hereinafter as a "Qualified
          Acquisition"):

                         (i) the Borrowers shall have given to the Agent written
          notice of such acquisition at least fifteen days prior to executing
          any binding commitment with respect thereto;

                         (ii) the Borrowers shall have demonstrated to the
          satisfaction of the Agent that the Borrowers will be in compliance
          with all of the covenants contained herein after giving effect to such
          acquisition and that no Event of Default or Possible Default then
          exists or would exist after giving effect to such acquisition;

                         (iii) the Borrowers shall have delivered to the Agent
          within twenty days prior to the consummation of such acquisition an
          acquisition report signed by the chief financial officer of each
          Borrower in form and substance satisfactory to the Agent which shall
          contain calculations demonstrating on a pro forma basis the Borrowers'
          compliance with the financial covenants set forth in this Section 8
          after giving effect to such acquisition and, if the borrowing
          hereunder in connection with such acquisition is in an amount in
          excess of $5,000,000, projections for the Borrowers for a five year
          period after the closing of such acquisition giving effect to such
          acquisition and including a statement of sources and uses of funds for
          such acquisition showing, among other things, the source of financing
          for such acquisition;

                         (iv) after giving effect to such acquisition, the
          Borrowers shall have (A) marketable fee simple title or an assignable
          and insurable leasehold interest in each property on which an acquired
          Tower is located and (B) either (I) written agreements for licensing
          of space on such Tower with at least 75% of the licensees of space on
          such Tower existing immediately prior to such acquisition or (II)

                                      -24-
<PAGE>
 
          in their good faith judgment, a strong probability of retaining 90% of
          the licensees of space on such Tower existing immediately prior to
          such acquisition, in each case, with respect to such license
          agreements, on substantially the same terms and conditions as existed
          immediately prior to such acquisition;

                    (v)  the Agent shall have received from the Borrowers an
          engineering report from an engineer, satisfactory to the Agent,
          acceptable in form and substance to the Agent, with respect to the
          construction, engineering and maintenance of the Towers to be acquired
          or managed and their compliance with applicable laws, rules and
          regulations;

                    (vi)  the agreement governing such acquisition and all
          related documents and instruments shall be satisfactory to the Agent
          in form and substance;

                    (vii)  the Purchase Price of such acquisition shall be
          payable in cash at the closing of such acquisition or by the delivery
          of a Borrower's note, so long as such note satisfies the following
          conditions (the aggregate Indebtedness evidenced by all such notes
          being referred to herein collectively as "Seller Debt"):

                         (A) such note shall be secured by a Letter of Credit
          issued pursuant hereto (subject to the satisfaction of the conditions
          to such issuance set forth herein) in the amount of such note but
          shall not be secured by any Lien on any property of either Borrower;

                         (B) such note shall be subordinate to all of the
          Obligations pursuant to a subordination agreement executed by the
          holder of such note and in form and substance satisfactory to the
          Agent;

                         (C) such note shall bear interest at a fixed rate which
          shall not exceed the lower of the rate of interest on United States
          Treasury obligations having a term of one year or 7% per annum;

                         (D) no principal payment shall be permitted or required
          on such note prior to December 31, 2004;

                                      -25-
<PAGE>
 
                         (E) the sum of the principal amount of such note and
          the principal amount of all other notes issued by the Borrowers in
          connection with Qualified Acquisitions shall not exceed $5,000,000;
          and

                         (F) no more than five notes issued by the Borrowers
          pursuant to Qualified Acquisitions shall be outstanding at any one
          time;

                    (viii)  the Borrowers shall have taken any actions as may be
          necessary or reasonably requested by the Agent to grant to the Agent,
          for the benefit of the Banks, first priority, perfected Liens in all
          assets, real and personal, tangible and intangible, acquired by either
          Borrower in such acquisition pursuant to the Collateral Documents,
          subject to no prior Liens except Permitted Liens; and if either
          Borrower acquires a Subsidiary or creates a Subsidiary pursuant to or
          in connection with such acquisition,

                         (A)  such Borrower shall execute a Pledge Agreement, in
          substantially the form of the Pledge Agreements or otherwise in form
          and substance satisfactory to the Majority Banks, pursuant to which
          all of the stock or other securities or equity interests of such
          acquired or created Subsidiary are pledged to the Agent, for the
          benefit of the Banks, as security for the Obligations of the Borrowers
          hereunder and under the Notes and the Collateral Documents;

                         (B) such acquired or created Subsidiary shall execute
          and deliver to the Agent, for the benefit of the Banks, a Guaranty,
          and shall grant to the Agent, for the benefit of the Banks, a first
          priority, perfected lien or security interest in all of its assets,
          real and personal, tangible and intangible, subject to no prior liens
          or security interests except for Permitted Liens, pursuant to a
          Security Agreement and Mortgages, in each case in substantially the
          form of the guaranties and security agreements contained in the
          Collateral Documents or otherwise in form and substance satisfactory
          to the Majority Banks, and shall take all actions required pursuant
          thereto; and

                         (C) the Borrowers shall have entered into an amendment
          to this Agreement, in form and substance reasonably satisfactory to
          the Banks, which shall make the covenants, defaults and other
          provisions of this Agreement applicable to such Subsidiary;

                                      -26-
<PAGE>
 
                    (ix)  the Borrowers shall have delivered to the Agent
          evidence reasonably satisfactory to the Agent to the effect that all
          approvals, consents or authorizations required in connection with such
          acquisition from any Licensing Authority or other governmental
          authority shall have been obtained, and such opinions as the Agent may
          reasonably request as to the liens and security interests granted to
          the Agent, for the benefit of the Banks, as required pursuant to this
          Section, and as to any required regulatory approvals for such
          acquisition;

                    (x)  the Agent shall have received copies of all documents
          relating to such acquisition, and the Borrowers shall have caused all
          opinions and certificates of the seller of such Towers delivered in
          connection with such closing to be addressed to the Banks; and

                    (xi)  if such acquisition involves an aggregate Purchase
          Price of at least $5,000,000, then the Banks shall have received a
          statement from KPMG Peat Marwick (or another nationally recognized
          firm of independent certified public accountants selected by the
          Borrowers and acceptable to the Agent) certifying as to the operating
          cash flow of the acquired Towers or, in the case of a management
          agreement, such management agreement, for the twelve month period most
          recently ended prior to the closing of such acquisition and as to such
          other matters as the Agent may reasonably request.

                  (c)  The Borrowers may, subject to compliance with Section
          2.7(b)(iii), dispose of tower facilities subject to the following
          conditions:

                    (i)  no Event of Default or Possible Default shall then
          exist or shall exist after giving effect to such disposition;

                    (ii)  the Operating Cash Flow attributable to such tower
          facilities in the four quarter period most recently ended, together
          with the Operating Cash Flow attributable to all tower facilities
          previously disposed of in such four quarter period, shall not exceed
          5% of total Operating Cash Flow for such four quarter period; and

                    (iii)  no tower facilities may be disposed of at any time if
          the Operating Cash Flow 

                                      -27-
<PAGE>
 
          attributable to such tower facilities, together with the Operating
          Cash Flow attributable to all tower facilities previously disposed of
          since the effective date of the Fourth Amendment, exceeds 15% of total
          Operating Cash Flow for the four quarter period most recently ended.

                  (t) Section 8.11 shall be amended by adding a new clause (d)
at the end thereof which shall read in its entirety as follows:

                      (d) any investment in joint ventures, whether structured
          as limited partnerships, limited liability companies or otherwise,
          subject to the following conditions:

                          (i) no Event of Default or Possible Default shall
          exist at the time of making any such investment or after giving effect
          to the making of such investment;

                          (ii) the contribution of all such joint ventures to
          the consolidated revenues of the Borrowers shall not at any time
          exceed 20% of the consolidated revenues of the Borrowers;

                          (iii) the aggregate amount of proceeds of the Loans
          contributed to such joint ventures shall not exceed $20,000,000; and

                          (iv) neither Borrower shall have any liability for any
          of the obligations or liabilities of any such joint venture.

                  (u) Section 8.13 shall be amended to read in its entirety as
follows:

                      (a) Leverage Ratio. The Borrowers shall not permit the
                          --------------
          Leverage Ratio as of any date in any period listed in Column A below
          to be greater than the ratio set forth in Column B below opposite such
          period:

                                      -28-
<PAGE>
 
<TABLE>
<CAPTION>
 
        Column A                                   Column B
        --------                                   --------     
        
        Period:                                    Permitted Ratio:
        -------                                    --------------- 
        <S>                                        <C>
        October 31, 1997, to December              7.0:1.0
        30, 1997:

        December 31, 1997, to December             6.0:1.0
        31, 2000:

        January 1, 2001, to June 30,               5.5:1.0
        2001:

        July 1, 2001, to December 31,              5.0:1.0
        2001:

        January 1, 2002, to June 30,               4.5:1.0
        2002:

        July 1, 2002, to December 31,              4.0:1.0
        2002:

        January 1, 2003, and                       3.5:1.0.
        thereafter:
        </TABLE>

                  (b)  Fixed Charge Coverage Ratio. The Borrowers shall not
                       ---------------------------
        permit the Charge Coverage Ratio as of any date to be less than 1.05 to
        1.00.

                  (c)  Projected Debt Service Coverage Ratio. The Borrowers
                       -------------------------------------
        shall not permit the ratio of Test Operating Cash Flow as of the end of
        any four quarter period ending on or prior to December 31, 2000, to
        Projected Debt Service for the subsequent four quarter period to be less
        than 1.1 to 1.0; and the Borrowers shall not permit the ratio of Test
        Operating Cash Flow as of the end of any four quarter period ending
        after December 31, 2000, to Projected Debt Service for the subsequent
        four quarter period to be less than 1.15 to 1.0.

                  (d) Operating Cash Flow to Interest Expense Ratio. The
                      ---------------------------------------------
        Borrowers shall not permit the ratio of Operating Cash Flow for any four
        quarter period to Interest Expense for such four quarter period to be
        less than 2.0:1.0.

           (v) Sections 10.1 and 10.2 shall be amended in their entirety to read
 as follows:

                                      -29-
<PAGE>
 
                10.1  Optional Defaults.  If any Event of Default referred to in
                      -----------------                                         
          Section 9.1 through and including Section 9.4 or Section 9.8 through
          and including Section 9.15 shall occur, the Issuing Bank shall not be
          required to issue any additional Letters of Credit, and the Agent,
          with the consent of the Majority Banks, upon written notice to the
          Borrowers, may

                    (a)  terminate the Reducing Commitment and the credit hereby
          established and forthwith upon such election the obligations of the
          Banks to make any further Loans hereunder (other than Loans resulting
          from the funding of Letters of Credit) immediately shall be
          terminated, and/or

                    (b)  accelerate the maturity of the Loans and all other
          Obligations, whereupon all Obligations shall become and thereafter be
          immediately due and payable in full without any presentment or demand
          and without any further or other notice of any kind, all of which are
          hereby waived by the Borrowers, and/or

                    (c)  demand the payment to the Issuing Bank of the aggregate
          stated amount of the outstanding Letters of Credit, which amount the
          Issuing Bank shall hold as security for the obligations incurred under
          the Letters of Credit.

                10.2  Automatic Defaults.  If any Event of Default referred to
                      ------------------                                      
          in Sections 9.5-9.7 shall occur,

                    (a)  the Reducing Commitment and the credit hereby
          established shall automatically and forthwith terminate, and the Banks
          thereafter shall be under no obligation to grant any further Loans
          hereunder (other than Loans resulting from the funding of Letters of
          Credit), and

                    (b)  the principal of and interest on the Notes, then
          outstanding, and all of the other Obligations shall thereupon become
          and thereafter be immediately due and payable in full, all without any
          presentment, demand or notice of any kind, which are hereby waived by
          the Borrowers, and

                    (c)  the Issuing Bank shall not be required to issue any
          additional Letters of Credit, and the aggregate stated amount of the
          outstanding Letters of Credit shall be immediately payable by the
          Borrowers to the Issuing Bank, which amount the Issuing Bank shall

                                      -30-
<PAGE>
 
          hold as security for the obligations incurred under the Letters of
          Credit.

               (w) Section 11.10 shall be amended in its entirety to read as
follows:

               11.1  Appointment.  KeyBank National Association is hereby
                     -----------                                         
          appointed Agent hereunder, and each of the Banks irrevocably
          authorizes the Agent to act as the agent of such Bank.  The Agent
          agrees to act as such upon the express conditions contained in this
          Section 11.  The Agent shall not have a fiduciary relationship in
          respect of any Bank by reason of this Agreement.

               (x) Section 11.10 shall be amended in its entirety to read as
follows:

               11.10  Successor Agent.
                      --------------- 

                    (a)  The Agent may, without the consent of the Borrowers or
          the other Banks, assign its rights and obligations as Agent hereunder
          and under the Collateral Documents to any wholly owned subsidiary of
          the Agent which has capital and retained earnings of at least
          $500,000,000, and upon such assignment, the former Agent shall be
          deemed to have retired, and such wholly owned subsidiary shall be
          deemed to be a successor Agent.

                    (b)  The Agent may resign at any time by giving written
          notice thereof to the Banks.  Upon any such resignation, the Required
          Banks shall have the right to appoint a successor Agent.  If no
          successor Agent shall have been so appointed by the Required Banks and
          shall have accepted such appointment within thirty days after the
          notice of resignation, then the retiring Agent may appoint a successor
          Agent.  Such successor Agent shall be a commercial bank having capital
          and retained earnings of at least $500,000,000.

                    (c)  Upon the acceptance of any appointment as the Agent
          hereunder by a successor Agent, such successor Agent shall thereupon
          succeed to and become vested with all the rights, powers, privileges
          and duties of the assigning or retiring Agent, and the assigning or
          retiring Agent shall be discharged from its duties and obligations
          hereunder.  After any assigning or retiring Agent's resignation
          hereunder as the Agent, the provisions of this Section 11.10 shall
          continue in effect for its benefit in respect of any

                                      -31-
<PAGE>
 
     actions taken or omitted to be taken by it while it was acting as the Agent
     hereunder.

          (y) The text of Exhibits [A, F, G, H, I, J, K and L] to the Original
Agreement shall be deleted and replaced with the text of Exhibits [A, F, G, H,
I, J, K and L] attached to this Amendment.

     3.   Conditions to Effectiveness.  The amendments set forth in Section 2
          ---------------------------                                        
shall be effective upon satisfaction of all of the following conditions:

          (a) Each Borrower shall have delivered to the Agent a certified copy
of resolutions of its Board of Directors evidencing approval of the execution,
delivery and performance of this Amendment, the New Notes (as that term is
defined below), and the other agreements, documents and instruments required
pursuant hereto.

          (b) The Borrowers shall have executed and delivered to the Banks
Reducing Revolving Credit Notes in the form attached hereto as Exhibit A (the
                                                               ---------     
"New Notes").

          (c) Holdco shall have executed and delivered to the Agent (i) an
Amended and Restated Holdco Guaranty in form and substance satisfactory to the
Agent and the Arranger, (ii) a Pledge Agreement in form and substance
satisfactory to the Agent and the Arranger pursuant to which Holdco pledges to
the Agent, for the benefit of the Banks, and grants to the Agent, for the
benefit of the Banks, a first priority security interest in, all of the issued
and outstanding capital stock of each of the Holdco Affiliates, and Holdco shall
have delivered to the Agent the stock certificates evidencing all of such stock,
together with duly executed blank stock powers with respect thereto, and (iii)
the Acknowledgment and Agreement set forth in Annex 1 attached hereto.

          (d) Each of the Holdco Affiliates shall have executed and delivered to
the Agent, for the benefit of the Banks, a guaranty in form and substance
satisfactory to the Agent and the Arranger, pursuant to which it guaranties the
obligations of the Borrowers under the Loan Agreement, the New Notes and the
Collateral Documents, and a security agreement in form and substance
satisfactory to the Agent and the Arranger, pursuant to which it grants to the
Agent, for the benefit of the Banks, as security for the obligations of the
Borrowers under the Loan Agreement, the New Notes and the Collateral Documents,
a security interest in substantially all of its assets, together with UCC-1
financing statements for filing in all jurisdictions in which

                                      -32-
<PAGE>
 
such filings are necessary or appropriate to perfect such security interests.

          (e) The Borrowers shall have delivered to the Agent UCC, judgment and
tax lien searches satisfactory to the Agent naming each Holdco Affiliate as a
debtor in all jurisdictions in which any Holdco Affiliate has any assets.

          (f) Spectrum Site Management Corporation shall have executed and
delivered to the Agent the Acknowledgment and Agreement set forth in Annex 2
attached hereto.

          (g) The Borrowers shall have delivered to the Agent evidence
satisfactory to it that the Crown Note shall have been paid in full (or that the
Crown Note shall be paid in full simultaneously with the making of Loans on the
effective date of this Amendment) and cancelled and that the pledge to Robert A.
Crown and Barbara Crown of all of the outstanding capital stock of those of the
Holdco Affiliates the stock of which has been pledged as security for the Crown
Note shall have been released.

          (h) The Borrowers shall have delivered to the Agent evidence
satisfactory to it that all obligations owing by the Holdco Affiliates to PNC
Bank, National Association pursuant to the Amended and Restated Credit
Agreement, dated as of August 14, 1997, between Crown Communication Inc. and PNC
Bank, National Association shall have been paid in full (or that such
obligations shall be paid in full simultaneously with the making of Loans on the
effective date of this Amendment) and that all liens and security interests
securing such obligations shall have been released.

          (i) The Borrowers, Holdco and Spectrum Site Management Corporation
shall have executed and delivered such amendments to the Pledge Agreements,
Security Agreements, Mortgages, Guaranty, and other Collateral Documents to
which they are respectively parties, as the Agent and its counsel may request,
in form and substance satisfactory to the Agent.

          (j) The Borrowers shall have delivered evidence satisfactory to the
Agent that Holdco has received unrestricted net cash proceeds from additional
capital contributions made by its stockholders or net cash proceeds from the
issuance of additional capital stock, in either case in an aggregate amount of
not less than $35,000,000, pursuant to documentation in form and substance
satisfactory to the Agent, and all of such proceeds shall have been used, or
shall be used simultaneously with the making of Loans on the effective date of
the Amendment, to pay the Crown Note.

                                      -33-
<PAGE>
 
          (k) The Borrowers shall have furnished to the Agent on or prior to the
Closing Date certificates of insurance or other satisfactory evidence that the
insurance required by Section 7.3 of the Loan Agreement is in full force and
effect and that each of the Holdco Affiliates has obtained insurance coverage
that would comply with the requirements of such Section 7.3 if such Holdco
Affiliate were a Borrower.

          (l) The Borrowers shall have delivered to the Agent (i) a pro forma
balance sheet and income statement as of the effective date of this Amendment
giving effect to the transactions contemplated hereby and (ii) a certificate of
their chief financial officers in form and substance satisfactory to the Agent
which shall contain calculations demonstrating on a pro forma basis the
Borrowers' compliance with the financial covenants set forth in Section 8 of the
Loan Agreement.

          (m) The Borrowers shall have delivered to the Agent the following:

              (i)    certificates of good standing for Holdco from the Secretary
of the State of Delaware, for CTC-Del from the Secretary of State of each of the
States of Delaware and Texas, for CTC-PR from the Secretary of the Commonwealth
of Puerto Rico, and for each Holdco Affiliate from the Secretary of State of the
jurisdiction of its incorporation, in each case dated as of a date as near to
the effective date of this Amendment as practicable;

              (ii)   a certificate signed by the Secretary or Assistant
Secretary of Holdco, each Borrower and each Holdco Affiliate certifying that
attached thereto are true and complete copies of the Certificate of
Incorporation and By-Laws of such entity;

              (iii)  an incumbency certificate for Holdco, each Borrower and
each Holdco Affiliate; and

              (iv)   such other documents as any Bank may reasonably request in
connection with the proceedings taken by either Borrower, Holdco or any Holdco
Affiliate authorizing this Amendment, the New Notes or the other Collateral
Documents and the transactions contemplated hereby, to the extent it is a party
thereto.

          (n) The Borrowers shall have paid to the Agent, the Arranger and the
Banks all commitment fees accrued under the Original Agreement and the fees
required pursuant to the Fee Letter. 

                                      -34-
<PAGE>
 
          (o) There shall have been no changes in the business, properties,
operations, prospects or condition, financial or otherwise, of either Borrower
since December 31, 1996, which are individually or in the aggregate materially
adverse.

          (p) The Borrowers shall have delivered to the Agent opinions in form
and substance satisfactory to the Agent from the Texas counsel of the Borrowers.

     4.   Covenants.
          --------- 

          (a) The Borrowers shall, by no later than December 31, 1997, (i) cause
CTC-Del to be merged with and into Crown Communication Inc. and (ii) cause the
other Holdco Affiliates to become wholly owned subsidiaries of Crown
Communication Inc., in each case pursuant to documentation in form and substance
satisfactory to the Agent.  The Borrowers shall give the Agent no less than
thirty days notice prior to the consummation of such merger.

          (b) Simultaneously with the merger required pursuant to Section 4(a),
Crown Communication Inc., as the successor by merger to CTC-Del, and CTC-PR
shall enter into an Amended and Restated Loan Agreement and amendments to all of
the Collateral Documents which shall (i) amend and restate the Original
Agreement to reflect all the amendments thereto including the amendments
contained herein, (ii) reflect the merger required pursuant to Section 4(a),
(iii) reflect all acquisitions, dispositions and other changed circumstances of
the Borrowers since April 25, 1995, (iv) contain such provisions as the Agent
may reasonably determine to be necessary or appropriate in connection with the
syndication of the Loans, and (v) contain such other matters as may be
reasonably required by the Agent and the Banks.  Such Amended and Restated Loan
Agreement shall contain, among other things, a negative covenant pursuant to
which the Borrowers will agree not to permit the ratio of Test Operating Cash
Flow for any four quarter period to the sum of their aggregate Total Debt plus
the principal amount of all Indebtedness of Holdco to exceed a ratio to be
agreed upon between the Borrowers and the Majority Banks.

          (c) The Borrowers shall, by no later than December 31, 1997, take all
actions with respect to any real estate owned by any Holdco Affiliate or either
Borrower that would have been required pursuant to Section 6.4 of the Loan
Agreement had such property been owned by CTC-Del as of the original closing
date under the Loan Agreement.

                                      -35-
<PAGE>
 
          (d) The Agent acknowledges that each of Key Corporate Capital Inc. and
PNC Bank, National Association intends to assign a portion of its interest in
the Reducing Commitment, the Notes and the Loans following the effective date of
this Amendment.  The Agent agrees that it will not charge either Key Corporate
Capital Inc. or PNC Bank, National Association the processing and recordation
fee required pursuant to the last sentence of Section 12.7(b) of the Loan
Agreement in respect of any such assignment occurring prior to January 31, 1998.

          (e) The Borrowers acknowledge that each of Key Corporate Capital Inc.
and PNC Bank, National Association intends to assign a portion of its interest
in the Reducing Commitment, the Notes and the Loans following the effective date
of this Amendment.  In order to facilitate such syndication efforts and to
lessen any breakage fees that might otherwise result from such assignments, the
Borrowers agree that during the period from the effective date of this Amendment
through January 31, 1998, they will not elect an Interest Period of longer than
one month in respect of any LIBOR Loans.

          (f) The Borrowers shall cause each Holdco Affiliate to comply with the
affirmative covenants set forth in Section 7 of the Loan Agreement as if each
such Holdco Affiliate were a Subsidiary of the Borrower, and the Borrowers shall
not permit any Holdco Affiliate to take any action which the Borrowers are
required to prohibit their Subsidiaries from taking under Section 8 of the Loan
Agreement.

     5.   Representations, Warranties and Events of Default.
          ------------------------------------------------- 

          (a) The Borrowers have provided to the Agent complete and correct
copies of the First Amended and Restated Asset Purchase and Merger Agreement
dated as of August 14, 1997, among Crown Network Systems, Inc., Crown Mobile
Systems, Inc., Robert A. Crown, Barbara Crown, Castle Acquisition Corp. I,
Castle Acquisition Corp. II and Castle Tower Holding Corp., and the schedules
and exhibits attached thereto.

          (b) Except as amended hereby, the terms, provisions, conditions and
agreements of the Original Agreement are hereby ratified and confirmed and shall
remain in full force and effect.  Each and every representation and warranty of
the Borrowers set forth in the Original Agreement, as amended hereby, other than
those which by their terms are limited to a specific date, is hereby confirmed
and ratified in all material respects and such representations and warranties as
so confirmed and ratified shall be deemed to have been made and undertaken as of
the date of this Amendment as well as at the time they were made and undertaken.

                                      -36-
<PAGE>
 
          (c) The Borrowers, jointly and severally, represent and warrant that:

              (i)   No Event of Default or Possible Default now exists or will
exist immediately following the execution hereof or after giving effect to the
transactions contemplated hereby.

              (ii)  All necessary corporate or shareholder actions on the part
of each Borrower, Holdco, each Holdco Affiliate, and each stockholder of Holdco
to authorize the execution, delivery and performance of this Amendment, the New
Notes, and all other amendments, agreements, documents or instruments required
pursuant hereto or thereto have been taken; this Amendment, the New Notes and
each such other amendment, agreement, document or instrument have been duly and
validly executed and delivered and are legally valid and binding upon each of
the Borrowers, Holdco and each Holdco Affiliate that is a party thereto and
enforceable in accordance with their respective terms, except to the extent that
the enforceability thereof may be limited by bankruptcy, insolvency or like laws
or by general equitable principles.

              (iii) The execution, delivery and performance of this Amendment,
the New Notes and all other amendments, agreements, documents and instruments
required pursuant hereto or thereto, and all actions and transactions con-
templated hereby and thereby will not (A) violate, be in conflict with, result
in a breach of or constitute (with due notice or lapse of time or both) a
default under (I) any provision of the charter documents or by-laws of either
Borrower, Holdco or any Holdco Affiliate, (II) any arbitration award or any
order of any court or of any other governmental agency or authority, (III) any
license, permit or authorization granted to either Borrower, Holdco or any
Holdco Affiliate or under which any such entity operates, or (IV) any applicable
law, rule, order or regulation, indenture, agreement or other instrument to
which either Borrower, Holdco or any Holdco Affiliate is a party or by which
either Borrower, Holdco or any Holdco Affiliate or any of its properties is
bound and which has not been waived or consented to, or (B) result in the
creation or imposition of any lien, charge or encumbrance of any nature
whatsoever, except as expressly permitted in the Loan Agreement, upon any of the
properties of either Borrower, Holdco or any Holdco Affiliate.

              (iv)  No consent, approval or authorization of, or filing,
registration or qualification with, any governmental authority (including,
without limitation, the FCC and any other Licensing Authority) is required to be
obtained by either Borrower, Holdco or any Holdco Affiliate in connection 

                                      -37-
<PAGE>
 
with the execution, delivery or performance of this Amendment, the New Notes or
any amendment, agreement, document or instrument required in connection herewith
or therewith which has not already been obtained or completed.

     6.   Affirmation of the Borrowers.  The Borrowers acknowledge that the
          ----------------------------                                     
security interests and liens granted by the Borrowers to the Agent, for the
benefit of the Banks, pursuant to the Subsidiary Pledge Agreement dated June 26,
1996 between CTC-Del and KeyBank National Association, as agent, the Security
Agreement, the Mortgages and the other Collateral Documents, as the same may
have been amended, remain in full force and effect and shall continue to secure
all Obligations of the Borrowers as such Obligations may be increased pursuant
hereto.

     7.   Fees and Expenses.  The Borrowers, jointly and severally, will
          -----------------                                             
reimburse the Agent and the Arranger upon demand for all out-of-pocket costs,
charges and expenses of the Agent and the Arranger (including fees and
disbursements of special counsel to the Agent and of special counsel to the
Arranger) in connection with the preparation, negotiation, execution and
delivery of this Amendment and the other agreements or documents relating hereto
or required hereby.

     8.   Counterparts.  This Amendment may be executed in as many counterparts
          ------------                                                         
as may be convenient and shall become binding when each Borrower, the Agent and
the Banks have executed at least one counterpart.

     9.   Governing Law.  This Amendment shall be a contract made under and
          -------------                                                    
governed by the laws of the State of Ohio, without regard to the conflicts of
law provisions thereof.

     10.  Binding Effect.  This Amendment shall be binding upon and shall inure
          --------------                                                       
to the benefit of the Borrowers, the Agent, the Arranger and the Banks and their
respective successors and assigns.

     11.  Reference to Original Agreement.  Except as amended hereby, the
          -------------------------------                                
Original Agreement shall remain in full force and effect and is hereby ratified
and confirmed in all respects. On and after the effectiveness of the amendments
to the Original Agreement accomplished hereby, each reference in the Original
Agreement to "this Agreement", "hereunder", "hereof", "herein" or words of like
import, and each reference to the Original Agreement or the original notes
issued pursuant thereto in any Note or other Collateral Document, or other
agreement, document or instrument executed and delivered pursuant to the
Original Agreement, shall be deemed a reference to the Original Agreement, as
amended hereby, or the New Notes, as the case may be.

                                      -38-
<PAGE>
 
     12.  No Other Modifications; Same Indebtedness.  Except as expressly
          -----------------------------------------                      
provided in this Amendment, all of the terms and conditions of the Original
Agreement remain unchanged and in full force and effect.  The modifications
effected by this Amendment and by the other documents and instruments
contemplated hereby shall not be deemed to provide for or effect a repayment and
re-advance of any of the Loans now outstanding, it being the intention of the
Borrowers, the Agent, the Arranger and the Banks that the Loans outstanding
under the Original Agreement, as amended by this Amendment, be and are the same
Indebtedness as that owing under the Original Agreement immediately prior to the
effectiveness hereof.  It is not the intention of the parties to cause an
extinctive novation of the Original Agreement, any Collateral Document or the
obligations thereunder.

                                      -39-
<PAGE>
 
     IN WITNESS WHEREOF, the parties have executed this Fourth Amendment to Loan
Agreement as of the date first above written.

BORROWERS:

CASTLE TOWER CORPORATION



By: /s/ DAVID L. IVY
   -------------------------------------
Name: David L. Ivy
     -----------------------------------
Title: President
      ----------------------------------

CASTLE TOWER CORPORATION (PR)



By: /s/ DAVID L. IVY
   -------------------------------------
Name: David L. Ivy
     -----------------------------------
Title: Chief Financial Officer
      ----------------------------------

BANKS:

KEY CORPORATE CAPITAL INC.



By: /s/ JASON R. WEAVER
   -------------------------------------
   Jason R. Weaver
   Vice President

PNC BANK, NATIONAL ASSOCIATION



By: /s/ DAVID G. SCHAICH
   -------------------------------------
Name: David G. Schaich
     -----------------------------------
Title: Vice President
      ----------------------------------


AGENT:

KEYBANK NATIONAL ASSOCIATION



By: /s/ JASON R. WEAVER
   -------------------------------------
   Jason R. Weaver
   Vice President

                                      -40-
<PAGE>
 
ARRANGER:

PNC BANK, NATIONAL ASSOCIATION



By: /s/ DAVID G. SCHAICH
   ------------------------------
Name: David G. Schaich
     ----------------------------
Title: Vice President
      ---------------------------

                                      -41-
<PAGE>
 
                                   SCHEDULE 1
                                   ----------

                        List of Banks and Ratable Shares
                        --------------------------------


<TABLE>
<CAPTION>
 
                      Reducing Loan Amount
                      and Ratable Share of
Banks:                Reducing Commitment:
- -----                 -------------------
<S>                   <C>
Key Corporate              $50,000,000
Capital Inc.                  (50%)
 
PNC Bank, National         $50,000,000
Association                   (50%)
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

                                LIST OF EXHIBITS
                                ----------------

<S>                     <C> 
Exhibit A               Form of Amended and Restated Reducing Note
                     
Exhibit F               Capitalization
                     
Exhibit G               Proceedings, Litigation and Non-Compliance with Law
                     
Exhibit H               Liens and Indebtedness
                     
Exhibit I               List of Contracts, Commitments and Licenses
                     
Exhibit J               ERISA Liabilities and Plans
                     
Exhibit K               Real Property List
                     
Exhibit L               Form of Compliance Certificate
</TABLE> 
<PAGE>
 
                                   EXHIBIT A
                                   ---------

                         REDUCING REVOLVING CREDIT NOTE
                         ------------------------------


$50,000,000                                                     October 31, 1997


     FOR VALUE RECEIVED, CASTLE TOWER CORPORATION, a Delaware corporation ("CTC-
Del"), and CASTLE TOWER CORPORATION (PR), a Puerto Rican corporation ("CTC-PR",
and together with CTC-Del collectively the "Makers" and individually a "Maker"),
hereby jointly and severally promise to pay to the order of ___________ (the
"Payee"), on or before December 31, 2004, in the manner and at the place
provided in the Loan Agreement, as that term is defined below, the principal sum
of $50,000,000, or if less, the outstanding balance of the Reducing Loans, as
that term is defined in the Loan Agreement described below, made by the Payee.

     The unpaid principal balance of this Note shall bear interest prior to
maturity at the rates determined in accordance with the provisions of that
certain Loan Agreement dated as of April 26, 1995, as amended by the First
Amendment to Loan Agreement dated as of June 26, 1996, the Second Amendment to
Loan Agreement dated as of January 17, 1997, the Third Amendment to Loan
Agreement dated as of April 3, 1997, and  the Fourth Amendment to Loan Agreement
dated as of October 31, 1997, among the Makers, KeyBank National Association
(formerly known as "Society National Bank"), as Arranger and Agent, PNC Bank,
National Association, as Arranger, the Payee and the other financial
institutions as may from time to time be parties thereto (as the same may be
amended, modified, extended or restated from time to time, the "Loan
Agreement").  Interest accrued on each Base Rate Loan shall be paid quarterly in
arrears on each Quarterly Date after the date hereof until such Loan is paid in
full, and interest accrued on each LIBOR Loan shall be paid on the last day of
the Interest Period thereof.

     This Note is subject to voluntary and mandatory prepayment in whole or in
part at the times and in the manner specified in the Loan Agreement.

     The Payee may enter all amounts of principal borrowed, paid or prepaid at
any time on the grid annexed hereto or on any separate record thereof maintained
by the Payee.

     This Note evidences indebtedness of the Makers to the Payee arising under
the Loan Agreement, to which reference is hereby made for a statement of the
rights of the Payee and the duties and obligations of the Makers in relation
thereto, but neither this reference to the Loan Agreement nor any provision
<PAGE>
 
thereof shall affect or impair the absolute and unconditional obligation of the
Makers to pay the principal of and interest on this Note when due.

     The principal of and all interest on this Note shall be paid as provided in
the Loan Agreement in immediately available funds constituting lawful money of
the United States of America, not later than 11:00 A.M. (Cleveland time) on the
day when due.

     Upon the occurrence of any Event of Default, the entire outstanding
principal amount of this Note and (to the extent permitted by law) unpaid
interest shall bear interest thereafter until paid in full at the Default
Interest Rate which shall be payable on demand.

     Subject to the provisions of Section 10 of the Loan Agreement, the entire
unpaid principal balance of this Note, together with all interest accrued
thereon, shall become immediately due and payable upon the occurrence of an
Event of Default.  Upon the occurrence of any Event of Default, the holder
hereof shall have all of the rights, powers and remedies provided in the Loan
Agreement or in any Collateral Document or at law or in equity.  Failure of the
Payee or any holder of this Note to exercise any such right or remedy available
hereunder or under the Loan Agreement or any Collateral Document or at law or in
equity shall not constitute a waiver of the right to exercise subsequently such
option or such other right or remedy.

     The payment of this Note is secured by certain Security Agreements, certain
Pledge Agreements, certain Guarantees and certain Mortgages and Collateral
Assignments of Leases, all as more fully identified in the Loan Agreement.

     To the extent permitted by law, except as otherwise provided herein or in
the Loan Agreement, the Makers and each endorser of this Note, and their
respective heirs, successors, legal representatives and assigns, hereby
severally waive presentment; protest and demand; notice of protest, demand,
dishonor and nonpayment; and diligence in collection, and agree to the
application of any bank balance as payment or part payment of this Note or as an
offset hereto as provided in the Loan Agreement, and further agree that the
holder hereof may release all or any part of the collateral given as security
for this Note or any rights of the holder thereunder and may amend this Note
(with the consent of the Makers), without notice to, and without in any way
affecting the liability of, the Makers or any endorser of this Note, and their
respective heirs, successors, legal representatives and assigns.


                                      -2-
<PAGE>
 
     If at any time the indebtedness evidenced by this Note is collected through
legal proceedings or this Note is placed in the hands of attorneys for
collection, the Makers and each endorser of this Note, and their respective
heirs, successors, legal representatives and assigns, hereby jointly and
severally agree to pay all costs and expenses (including reasonable attorneys'
fees if permitted by law) incurred by the holder of this Note in collecting or
attempting to collect such indebtedness.

     The rate of interest payable on this Note from time to time shall in no
event exceed the maximum rate permissible under applicable law.  If the rate of
interest payable on this Note is ever reduced as a result of the preceding
sentence and at any time thereafter the maximum rate permitted by applicable law
shall exceed the rate of interest provided for on this Note, then the rate
provided for on this Note shall be increased to the maximum rate permitted by
applicable law for such period as is required so that the total amount of
interest received by the Payee is that which would have been received by the
Payee but for the operation of the preceding sentence.

     THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH THE
PROVISIONS OF, THE LAW OF THE STATE OF OHIO, WITHOUT REGARD TO THE CONFLICTS OF
LAW PRINCIPLES THEREOF.

     Capitalized terms used herein and not otherwise defined shall have the
meanings assigned to them in the Loan Agreement.


CASTLE TOWER CORPORATION



By:__________________________
Name:________________________
Title:_______________________

CASTLE TOWER CORPORATION (PR)



By:__________________________
Name:________________________
Title:_______________________


                                      -3-
<PAGE>
 
<TABLE> 
<CAPTION> 
                             REVOLVING CREDIT GRID
                             ---------------------
- --------------------------------------------------------------
          AMOUNT        AMOUNT       UNPAID         OFFICER'S
DATE     BORROWED        PAID        BALANCE        INITIALS
<S>      <C>            <C>          <C>            <C>     
- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------

- --------------------------------------------------------------
</TABLE> 
<PAGE>
 
                                    ANNEX 1
                                    -------

           ACKNOWLEDGMENT AND AGREEMENT OF CASTLE TOWER HOLDING CORP.
           ----------------------------------------------------------


     The undersigned hereby (a) certifies that it is the sole shareholder of
CTC-Del and consents to the execution and delivery by the Borrowers of the
foregoing Fourth Amendment to Loan Agreement and the New Notes described
therein, and (b) acknowledges and agrees (i) that the Holdco Pledge Agreement,
the Guaranty and each other Collateral Document (as those terms are defined in
the Loan Agreement, and as such documents may be amended pursuant to the Fourth
Amendment to Loan Agreement) to which it is a party, and all of its respective
obligations thereunder, remain in full force and effect, (ii) that the security
interests granted pursuant to such Holdco Pledge Agreement secure all of the
Obligations, as increased pursuant to the Fourth Amendment to Loan Agreement,
and (iii) that the Guaranteed Obligations, as that term is defined in the
Guaranty, include all of the Obligations, as increased pursuant to the Fourth
Amendment to Loan Agreement.

CASTLE TOWER HOLDING CORP.



By:  _________________________
Name:_________________________
Title:________________________


                                      -5-
<PAGE>
 
                                    ANNEX 2
                                    -------

                        ACKNOWLEDGMENT AND AGREEMENT OF
                      SPECTRUM SITE MANAGEMENT CORPORATION
                      ------------------------------------


     The undersigned hereby (a) consents to the execution and delivery by the
Borrowers of the foregoing Fourth Amendment to Loan Agreement and the New Notes
described therein, and (b) acknowledges and agrees (i) that the Security
Agreement dated June 26, 1996, between the undersigned and KeyBank National
Association, as agent (the "Security Agreement"), and the Guaranty executed by
the undersigned in favor of KeyBank National Association, as agent (the
"Guaranty") and each other Collateral Document (as defined in the Loan
Agreement, and as such documents may be amended pursuant to the Fourth Amendment
to Loan Agreement) to which it is a party, and all of its respective obligations
thereunder, remain in full force and effect, (ii) that the security interests
granted pursuant to such Security Agreement secure all of the Obligations, as
increased pursuant to the Fourth Amendment to Loan Agreement, and (iii) that the
Guaranteed Obligations, as that term is defined in the Guaranty, include all of
the Obligations, as increased pursuant to the Fourth Amendment to Loan
Agreement.

SPECTRUM SITE MANAGEMENT CORPORATION



By:  _________________________
Name:_________________________
Title:________________________


                                      -6-

<PAGE>
 
                                                                    Exhibit 10.7

                       FIFTH AMENDMENT TO LOAN AGREEMENT


     This FIFTH AMENDMENT TO LOAN AGREEMENT is made and entered into as of
November 24, 1997, by and among CASTLE TOWER CORPORATION, a Delaware corporation
("CTC-Del"), CROWN CASTLE INTERNATIONAL CORP. DE PUERTO RICO (formerly known as
"Castle Tower Corporation (PR)"), a Puerto Rico corporation ("CCIC-PR" and,
together with CTC-Del, collectively, the "Borrowers" and individually, a
"Borrower"), the FINANCIAL INSTITUTIONS listed on the signature pages hereof,
KEYBANK NATIONAL ASSOCIATION (formerly known as "Society National Bank"), as
Arranger and agent (the "Agent"), and PNC BANK, NATIONAL ASSOCIATION, as
Arranger (the "Arranger").

                                   RECITALS
                                   --------

     A.    CTC-Del, CCIC-PR, the Agent and the Banks entered into a Loan
Agreement dated as of April 26, 1995, as amended by the First Amendment to Loan
Agreement dated as of June 26, 1996, the Second Amendment to Loan Agreement
dated as of January 17, 1997, the Third Amendment to Loan Agreement dated as of
April 3, 1997, the Fourth Amendment to Loan Agreement dated as of October 31,
1997 (as so amended, the "Original Agreement"), pursuant to which the Banks
agreed to make available to the Borrowers loans of up to $100,000,000. The
Original Agreement, as amended hereby, may be referred to hereinafter as the
"Loan Agreement." Capitalized terms used herein and not otherwise defined shall
have the meanings assigned to them in the Loan Agreement.

     B.    The Borrowers desire to increase, under certain circumstances, the
amount of Capital Distributions that may be made by CTC-Del, and the Agent and
the Banks have agreed to such request.

                                  AGREEMENTS
                                  ----------

     In consideration of the foregoing Recitals and of the covenants and
representations contained herein, and for other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the Borrowers, the
Agent, the Arranger and the Banks agree as follows:

     1.    Amendments.
           ---------- 

           (a)   Section 8.9(a) of the Original Agreement is hereby amended by
deleting the reference to "$28,000,000" in clause (ii)(A) thereof and replacing
it with a reference to "$33,000,000."

           (b)   The definition of the term "Total Debt" in Section 1.1 is
hereby amended in its entirety to read as follows:

           ""Total Debt" means, without duplication, (i) all Indebtedness of
             ----------                                                     
     the Borrowers, the Holdco Affiliates and their respective Subsidiaries for
     borrowed money, including the Loans, all Capitalized Lease Obligations of
     the Borrowers, the Holdco Affiliates and their Subsidiaries, all other
     Indebtedness of the Borrowers, the Holdco Affiliates and their Subsidiaries
     represented by notes or drafts representing extensions of credit for
     borrowed money, all other Indebtedness of other Persons for which either
     Borrower, any Holdco Affiliate or any of their Subsidiaries 
<PAGE>
 
     is a Guarantor, all obligations of the Borrowers, the Holdco Affiliates and
     their Subsidiaries evidenced by bonds, debentures, notes or other similar
     instruments (including all such obligations to which any property or asset
     owned by a Borrower, Holdco Affiliate or Subsidiary is subject, whether or
     not the obligation secured thereby shall have been assumed) and all
     obligations of either Borrower, any Holdco Affiliate or any Subsidiary as
     an account party to reimburse any bank or any other Person in respect of
     letters of credit (other than the Letters of Credit) or bankers'
     acceptances, plus (ii) each of the following items of Indebtedness to the
     extent such Indebtedness has a maturity date, or requires a principal
     payment, prior to the Termination Date: all Indebtedness for borrowed money
     of Holdco, all other Indebtedness represented by notes or drafts
     representing extensions of credit for borrowed money of Holdco, all
     obligations evidenced by bonds, debentures, notes or other similar
     instruments of Holdco and all obligations of Holdco as an account party to
     reimburse any bank or any other Person in respect of letters of credit or
     bankers' acceptances."

     2.    Representations, Warranties and Events of Default.
           ------------------------------------------------- 

           (a)   Except as amended hereby, the terms, provisions, conditions and
agreements of the Original Agreement are hereby ratified and confirmed and shall
remain in full force and effect. Each and every representation and warranty of
the Borrowers set forth in the Original Agreement, as amended hereby, other than
those which by their terms are limited to a specific date, is hereby confirmed
and ratified in all material respects and such representations and warranties as
so confirmed and ratified shall be deemed to have been made and undertaken as of
the date of this Amendment as well as at the time they were made and undertaken.

           (b)   The Borrowers, jointly and severally, represent and warrant
that:

                 (i)   No Event of Default or Possible Default now exists or
will exist immediately following the execution hereof or after giving effect to
the transactions contemplated hereby.

                 (ii)  All necessary corporate or shareholder actions on the
part of each Borrower to authorize the execution, delivery and performance of
this Amendment have been taken; this Amendment has been duly and validly
executed and delivered and is legally valid and binding upon each of the
Borrowers and enforceable in accordance with its terms, except to the extent
that the enforceability hereof may be limited by bankruptcy, insolvency or like
laws or by general equitable principles.

                 (iii) The execution, delivery and performance of this Amendment
will not (A) violate, be in conflict with, result in a breach of or constitute
(with due notice or lapse of time or both) a default under (I) any provision of
the charter documents or by-laws of either Borrower, Holdco or any Holdco
Affiliate, (II) any arbitration award or any order of any court or of any other
governmental agency or authority, (III) any license, permit or authorization
granted to either Borrower, Holdco or any Holdco Affiliate or under which any
such entity 

                                      -2-
<PAGE>
 
operates, or (IV) any applicable law, rule, order or regulation, indenture,
agreement or other instrument to which either Borrower, Holdco or any Holdco
Affiliate is a party or by which either Borrower, Holdco or any Holdco Affiliate
or any of its properties is bound and which has not been waived or consented to,
or (B) result in the creation or imposition of any lien, charge or encumbrance
of any nature whatsoever, except as expressly permitted in the Loan Agreement,
upon any of the properties of either Borrower, Holdco or any Holdco Affiliate.

                 (iv)  No consent, approval or authorization of, or filing,
registration or qualification with, any governmental authority (including,
without limitation, the FCC and any other Licensing Authority) is required to be
obtained by either Borrower, Holdco or any Holdco Affiliate in connection with
the execution, delivery or performance of this Amendment, the New Notes or any
amendment, agreement, document or instrument required in connection herewith or
therewith which has not already been obtained or completed.

     3.    Counterparts.  This Amendment may be executed in as many counterparts
           ------------
as may be convenient and shall become binding when each Borrower, the Agent, the
Arranger and the Banks have executed at least one counterpart.

     4.    Governing Law.  This Amendment shall be a contract made under and
           -------------                                                    
governed by the laws of the State of Ohio, without regard to the conflicts of
law provisions thereof.

     5.    Binding Effect.  This Amendment shall be binding upon and shall inure
           --------------
to the benefit of the Borrowers, the Agent, the Arranger and the Banks and their
respective successors and assigns.

     6.    Reference to Original Agreement.  Except as amended hereby, the
           -------------------------------
Original Agreement shall remain in full force and effect and is hereby ratified
and confirmed in all respects. On and after the effectiveness of the amendments
to the Original Agreement accomplished hereby, each reference in the Original
Agreement to "this Agreement", "hereunder", "hereof", "herein" or words of like
import, and each reference to the Original Agreement or the original notes
issued pursuant thereto in any Note or other Collateral Document, or other
agreement, document or instrument executed and delivered pursuant to the
Original Agreement, shall be deemed a reference to the Original Agreement, as
amended hereby.

                                      -3-
<PAGE>
 
     IN WITNESS WHEREOF, the parties have executed this Fifth Amendment to Loan
Agreement as of the date first above written.

BORROWERS:

CASTLE TOWER CORPORATION



By: /s/ CHARLES C. GREEN, III
   -------------------------------
Name: Charles C. Green, III
     -----------------------------
Title: EVP/CFO
      ----------------------------

CROWN CASTLE INTERNATIONAL CORP. DE PUERTO RICO



By: /s/ DAVID L. IVY
   -------------------------------
Name: David L. Ivy
     -----------------------------
Title: VP
      ----------------------------

BANKS:

KEY CORPORATE CAPITAL INC.



By: /s/ JASON R. WEAVER
   -------------------------------
   Jason R. Weaver
   Vice President

PNC BANK, NATIONAL ASSOCIATION



By: /s/ DAVID SCHAICH
   -------------------------------
Name: David Schaich
     -----------------------------
Title: Vice President
      ----------------------------

AGENT:

KEYBANK NATIONAL ASSOCIATION



By: /s/ JASON R. WEAVER
   -------------------------------
   Jason R. Weaver
   Vice President

                                      -4-
<PAGE>
 
ARRANGER:

PNC BANK, NATIONAL ASSOCIATION



By: /s/ DAVID SCHAICH
   -------------------------------
Name: David Schaich
     -----------------------------
Title: Vice President
      ----------------------------

                                      -5-

<PAGE>
 
                                                                    Exhibit 10.8

                  AMENDED AND RESTATED LIMITED HOLDCO GUARANTY
                  --------------------------------------------


          THIS AMENDED AND RESTATED LIMITED HOLDCO GUARANTY is made and entered
into as of November 25, 1997, by CROWN CASTLE INTERNATIONAL CORP. (formerly
known as "Castle Tower Holding Corp."), a Delaware corporation (the
"Guarantor"), in favor of KEYBANK NATIONAL ASSOCIATION, as agent for the Banks
(as that term is defined in the Loan Agreement described below) (in such
capacity, the "Agent").

                                    RECITALS
                                    --------

          A.  The Guarantor owns all the issued and outstanding capital stock of
CASTLE TOWER CORPORATION, a Delaware corporation ("CTC-Del"), and CTC-Del owns
all the issued and outstanding capital stock of CROWN CASTLE INTERNATIONAL CORP.
DE PUERTO RICO (formerly known as "Castle Tower Corporation (PR)"), a Puerto
Rico corporation ("CTC-PR" and, together with CTC-Del, collectively, the
"Borrowers" and individually, a "Borrower").

          B.  The Borrowers, the Agent, PNC Bank, National Association, as an
Arranger, and the Banks which are a party thereto have entered into a Loan
Agreement dated as of April 26, 1995, as amended by the First Amendment to Loan
Agreement dated as of June 26, 1996, the Second Amendment to Loan Agreement
dated as of January 17, 1997, the Third Amendment to the Loan Agreement dated as
of April 3, 1997, and the Fourth Amendment to the Loan Agreement dated as of
October 31, 1997 (as the same may be further amended, restated, modified or
extended, the "Loan Agreement"), pursuant to which the Banks have agreed to make
available to the Borrowers loans of up to $100,000,000.  All capitalized terms
used herein and not otherwise defined herein shall have the meanings ascribed to
such terms in the Loan Agreement.

          C.  The Borrowers and the Guarantor have requested that the Agent and
the Banks agree to modify the guaranty executed by the Guarantor pursuant to the
Fourth Amendment to Loan Agreement in certain respects, and the Agent and the
Banks have agreed to such request.

          D.  The Guarantor will derive substantial benefits as a result of the
extensions of credit to the Borrowers under the Loan Agreement, which benefits
are hereby acknowledged by the Guarantor.

          E.  The Banks have appointed the Agent as their agent for the purpose,
among other things, of protecting and preserving 
<PAGE>
 
the security for the repayment of the Borrowers' obligations under the Loan
Agreement.

                                   AGREEMENTS
                                   ----------

          In consideration of the foregoing Recitals, and of the Loans made or
to be made by the Banks to the Borrowers under the Loan Agreement, which will be
of material economic benefit to the Guarantor, the Guarantor agrees as follows
in favor of the Agent for the benefit of the Banks:

          1.   Guaranty of Payment.
               ------------------- 
 
          (a)  The Guarantor hereby absolutely, unconditionally and irrevocably
guarantees as primary obligor, and not merely as surety, the prompt performance
and payment in full when due, whether at stated maturity, by acceleration or
otherwise (including, without limitation, obligations that would become due but
for the operation of the automatic stay under Section 362(a) of Title 11 of the
United States Code, including interest, fees and other charges whether or not a
claim is allowed for such obligations in any such bankruptcy proceeding), of (i)
all indebtedness, Obligations and liabilities of the Borrowers arising at any
time, now or in the future, pursuant to the Loan Agreement, the Notes or any
Collateral Document, including, without limitation, the Borrowers' obligations
under any outstanding Letters of Credit; (ii) all indebtedness, Obligations and
liabilities of the Borrowers arising at any time, now or in the future, pursuant
to any agreement with any Bank or an Affiliate of any Bank with respect to
interest rate swap agreements or other agreements regarding Rate Hedging
Obligations; (iii) all reasonable costs and expenses incurred by the Agent or
any Bank, including, without limitation, reasonable attorneys fees and legal
expenses, in the exercise, preservation or enforcement of any of the rights,
powers or remedies of the Agent or the Banks, or in the enforcement of the
obligations of the Guarantor, hereunder and under any other Collateral Document
to which the Guarantor is a party; and (iv) any renewals, continuations or
extensions of any of the foregoing (all of which are referred to herein as the
"Guaranteed Obligations").

          (b)  Notwithstanding anything to the contrary contained in this
Guaranty, the recourse of the Agent and the Banks hereunder against the
Guarantor for the Guaranteed Obligations shall be limited to the assets and
property pledged by the Guarantor to the Agent or the Banks pursuant to any
pledge agreement or other Collateral Document, and neither the Agent nor any
Bank shall have any recourse hereunder against the Guarantor or any of its other
assets or properties in respect of the Guaranteed Obligations; provided,
                                                               -------- 
however, that the Guarantor 
- -------                                                                        

                                      -2-
<PAGE>
 
shall be liable for any costs, expenses, losses and liabilities suffered or
incurred by the Agent or any Bank as a result of the breach by the Guarantor of
any of its representations or warranties herein or in any of the other
Collateral Documents to which it is a party or the failure of the Guarantor to
comply with the obligations imposed on it hereunder or under any of the other
Collateral Documents to which it is a party, provided, however, notwithstanding
the foregoing proviso, nothing therein shall be construed as to make the
Guarantor secondarily liable for the Guaranteed Obligations under any event or
circumstance, it being the intent of such proviso that it be limited to the
costs, expenses, losses and liabilities described above.

          2.  Extension or Renewal of Guaranteed Obligations.  The Guarantor
              ----------------------------------------------                
agrees that the Guaranteed Obligations may be extended or renewed, in whole or
in part, without notice or further assent from it, that the Guarantor will
remain bound upon this Guaranty notwithstanding any extension, renewal or other
alteration of any Guaranteed Obligation and that the guaranty herein made shall
apply to the Guaranteed Obligations as so amended, renewed or altered.  The
Guarantor waives diligence, presentment, demand of payment, filing of claims
with a court in the event of insolvency or bankruptcy of a Borrower, any right
to require a proceeding first against such Borrower, protest, notice and all
demands whatsoever and covenants that its guaranty of such Borrower's
Obligations under this Guaranty will not be discharged except by complete
performance by a Borrower of such Obligations

          3.  Nature of Guaranty:  Continuing, Absolute and Unconditional.
              ----------------------------------------------------------- 
  
              (a) This Guaranty is and is intended to be a continuing guaranty
of payment when due of the Guaranteed Obligations, and not of collection, and is
independent of and in addition to any other guaranty, indorsement, collateral or
other agreement held by the Banks or the Agent, for the benefit of the Banks,
therefor or with respect thereto, whether or not furnished by the Guarantor. The
Guarantor waives any right to require that any resort be had by the Agent or any
Bank to any of the security held for payment of any of the Guaranteed
Obligations (subject to the limitation set forth in Section 1(b) hereof) or to
any balance of any deposit account or credit on the books of the Agent or any
Bank in favor of the Borrowers or any other Person. Upon the occurrence and
during the continuance of any Event of Default, the Agent or the Banks may, at
their sole election, proceed directly and at once, without notice, against the
Guarantor to collect and recover the full amount or any portion of the
Guaranteed Obligations, without first proceeding against the Borrowers or any
other Person, or against any security or 

                                      -3-
<PAGE>
 
collateral for the Guaranteed Obligations (subject to the limitation set forth
in Section 1(b) hereof). All Guaranteed Obligations shall be conclusively
presumed to have been created in reliance hereon.

              (b)  This Guaranty shall not be changed or affected by any
representation, oral agreement, act or thing whatsoever, except as herein
provided.  This Guaranty is intended by the Guarantor to be the final, complete
and exclusive expression of the agreement between the Guarantor and the Agent,
for the benefit of the Banks, with respect to the subject matter hereof.

              (c) The obligations of the Guarantor under this Guaranty are
absolute and unconditional and shall not be impaired or discharged by:

                  (i)   the failure of the Agent or any Bank to assert any claim
or demand or to enforce any right or remedy against the Borrowers, any other
guarantor or any other party to a Collateral Document under the provisions of
the Loan Agreement, the Notes, any Collateral Document or any other agreement or
otherwise;

                 (ii)   any extension, renewal or other alteration of any
provision of the Loan Agreement, the Notes, any Collateral Document or any other
agreement or otherwise;

                 (iii)  any rescission, waiver, amendment or modification of any
of the terms or provisions of the Loan Agreement, the Notes, any Collateral
Document or any other agreement or otherwise;

                 (iv)   the failure of the Agent or any Bank to assert any claim
or demand or to exercise or enforce any right or remedy under the Loan
Agreement, any Collateral Document or any other agreement or otherwise, or
against any other guarantor of, or any other party which has provided security
for, any of the Guaranteed Obligations;

                 (v)    the sale, exchange, release, surrender, realization of
or upon or the failure to perfect with respect to or otherwise deal with in any
manner and in any order any property by whomsoever at any time pledged or
mortgaged to secure, or howsoever securing, the Guaranteed Obligations;

                 (vi)   the settlement or compromise of any of the Guaranteed
Obligations, any security therefor or any liability (including any of those
hereunder) incurred directly or indirectly in respect thereof or hereof, or any
subordination of 

                                      -4-
<PAGE>
 
the payment of all or any part thereof to the payment of any liability (whether
due or not) of the Borrowers to creditors of the Borrowers other than the Agent,
the Banks and the Guarantor;

                 (vii)  application of any sums by whomsoever paid or howsoever
realized to any liability or liabilities of the Borrowers to the Agent or the
Banks regardless of what liability or liabilities of the Borrowers remain
unpaid; or

                 (viii) the act or failure to act in any manner referred to in
this Guaranty which may deprive the Guarantor of its right to subrogation or
contribution against the Borrowers or any other guarantor to recover any
payments made pursuant to this Guaranty.

            (d)  The Guarantor's obligation hereunder is to pay the Guaranteed
Obligations in full when due according to the Loan Agreement as herein provided
(subject to the limitation set forth in Section 1(b) hereof), and such
obligation shall not be affected by any stay or extension of time for payment by
either Borrower resulting from any proceeding under Title 11 of the United
States Code, as now constituted or hereafter amended or replaced, or any similar
federal or state law.

          4.  No Discharge or Diminishment of Guaranty.  Except for the
              ---------------------------------------                  
limitation set forth in Section 1(b) hereof, the obligations of the Guarantor
under this Guaranty shall not be subject to any reduction, limitation,
impairment or termination for any reason (other than if the Guaranteed
Obligations have been indefeasibly paid in full and all commitments under the
Loan Agreement have terminated and no Letters of Credit remain outstanding),
including, without limitation, any claim of waiver, release, surrender,
alteration or compromise of any of the Guaranteed Obligations, and shall not be
subject to any defense or setoff, counterclaim, recoupment or termination
whatsoever by reason of the invalidity, illegality or unenforceability of any of
the Guaranteed Obligations or any discharge of the Borrowers from any of the
Guaranteed Obligations in a bankruptcy or similar proceeding or otherwise.
Without limiting the generality of the foregoing, and subject to the limitation
set forth in Section 1(b) hereof, the obligations of the Guarantor under this
Guaranty shall not be discharged or impaired or otherwise affected by the
failure of the Agent or any Bank to assert any claim or demand or to enforce any
remedy under the Loan Agreement, any Collateral Document or any other agreement
or otherwise, by any waiver or modification of any such agreement, by any
default, waiver or delay, or by any other act or agreement or thing or omission
or delay to do any other act or thing that may or might in any manner or to any
extent vary the risk of the Guarantor or that 

                                      -5-
<PAGE>
 
would otherwise operate as a discharge of the Guarantor as a matter of law or
equity.

          5.  Representations and Warranties.  The Guarantor hereby represents,
              ------------------------------                                   
warrants and agrees as follows:

               (a)  The Guarantor (i) is a duly organized and validly existing
 corporation in good standing under the laws of the State of Delaware, (ii) has
 the corporate power and authority to own its property and assets and to
 transact the business in which it is engaged and (iii) is duly qualified as a
 foreign corporation and in good standing in each jurisdiction where the
 ownership, leasing or operation of property or the conduct of its business
 requires such qualification, except where the failure to so qualify could not
 reasonably be expected to have a material adverse effect on the business,
 prospects, operations, property, assets or other condition, financial or
 otherwise, of the Guarantor.

               (b)  The Guarantor has the corporate power to execute, deliver
and perform the terms and provisions of this Guaranty and the other Collateral
Documents to which it is a party (collectively, the "CCI Agreements") and has
taken all necessary action to authorize the execution, delivery and performance
by it of this Guaranty and the CCI Agreements. The Guarantor has duly executed
and delivered this Guaranty and the CCI Agreements, and this Guaranty and the
CCI Agreements constitute its legal, valid and binding obligations enforceable
in accordance with their respective terms, except as such enforceability may be
limited by applicable bankruptcy, insolvency, reorganization or other similar
laws affecting the enforcement of creditors' rights generally and by general
principles of equity.

               (c)  Neither the execution, delivery or performance by the
Guarantor of this Guaranty and the CCI Agreements, nor compliance by it with the
terms and provisions hereof and thereof, (i) will contravene any provision of
any law, statute, rule or regulation or any order, writ, injunction or decree of
any court or governmental instrumentality, (ii) will conflict or be inconsistent
with or result in any breach of any of the material terms, covenants, conditions
or provisions of, or constitute a material default under, or result in the
creation or imposition of (or the obligation to create or impose) any Lien or
encumbrance upon any of the property or assets of the Guarantor pursuant to the
terms of any indenture, mortgage, deed of trust, credit agreement, loan
agreement or any other agreement, contract or instrument to which the Guarantor
is a party or by which it or any of its property or assets is bound or to which
it may be subject or (iii) will violate any provision of the Certificate of

                                      -6-
<PAGE>
 
Incorporation, By-Laws or other organizational document of the Guarantor.

               (d)  No order, consent, approval, license, authorization or
validation of, or filing, recording or registration with, or exemption by, any
governmental or public body or authority, or any subdivision thereof, is
required to authorize, or is required in connection with, the execution,
delivery, performance, legality, validity, binding effect or enforceability of
this Guaranty or the CCI Agreements.

               (e)  There are no actions, suits or proceedings pending or, to
the knowledge of the Guarantor, threatened against or affecting the Guarantor
that might materially and adversely affect the business, financial condition or
results of operations of the Guarantor. No judgment or order for the payment of
money has been entered against the Guarantor which remains outstanding and
unpaid.

               (f)  The Guarantor has received, or has the right hereunder to
receive, consideration which is the reasonable equivalent value of the
obligations and liabilities that the Guarantor has incurred to the Banks.  The
Guarantor is not insolvent as defined in Section 101 of Title 11 of the United
States Code or any applicable state insolvency statute, nor, after giving effect
to the consummation of the transactions contemplated herein, will the Guarantor
be rendered insolvent by the execution and delivery of this Guaranty or any
other Collateral Document to which it is a party.  The Guarantor is neither
engaged nor about to engage in any business or transaction for which the assets
retained by it shall be an unreasonably small capital, taking into consideration
the obligations to the Banks incurred hereunder.  The Guarantor does not intend
to, nor does it believe that it will, incur debts beyond its ability to pay them
as they mature.

               (g)  All representations and warranties contained in the Loan
Agreement that pertain to the Guarantor are true and correct in all material
respects.

               (h)  Teleshares, Inc., a Georgia corporation, which is wholly
owned by the Guarantor has no material assets and is in the process of being
dissolved and liquidated.

          6.  Covenants.
              --------- 

               (a)  The Guarantor will at all times preserve and keep in full
force and effect its existence as a corporation incorporated in the State of
Delaware and shall at all times use 

                                      -7-
<PAGE>
 
its good faith efforts to preserve and keep in full force and effect all rights
and franchises material to its business.

               (b)  The Guarantor shall comply in all material respects with all
applicable laws, rules, regulations and orders, such compliance to include,
without limitation, paying when due all taxes, assessments and governmental
charges imposed upon it or upon any of its properties or assets or in respect of
any of its franchises, businesses, income or property before any penalty or
interest accrues thereon unless such taxes, assessments or governmental charges
are being diligently contested by the Guarantor in good faith.

               (c)  The Guarantor shall keep and maintain books of records and
accounts with respect to its operations sufficient to enable it to prepare its
financial statements in accordance with GAAP and shall permit the Agent and the
Banks and their respective officers, employees and authorized agents to examine,
copy and make excerpts from such books and records and to inspect the properties
of the Guarantor both real and personal at any reasonable time.  The Guarantor
shall:

                    (i)    furnish to the Agent (A) on or before the forty-fifth
day after the close of each of its fiscal quarters unaudited consolidated and
consolidating balance sheets as at the close of such quarter and consolidated
and consolidating income statements for such quarter, prepared in accordance
with GAAP and (B) copies of any additional monthly, quarterly or annual
financial statements required to be filed by the Guarantor with any regulatory
agency or any securities exchange on which the Guarantor's securities are listed
promptly following the filing thereof, in each case certified by its chief
financial officer as being complete and correct and fairly presenting the
financial condition of the Guarantor as at the close of such quarter and the
results of its operations for such quarter;

                    (ii)   furnish to the Agent on or before the ninetieth day
after the end of each of its fiscal years, (A) its consolidated balance sheet as
at the close of such fiscal year and its consolidated income statement for such
fiscal year, prepared in accordance with GAAP, audited by independent
accountants as selected by it and acceptable to the Agent as fairly presenting
the financial condition of the Guarantor as at the close of such fiscal year and
(B) an annual auditor's letter; and

                    (iii)  furnish to the Agent copies of any registration
statements and regular periodic reports, if any, which the Guarantor shall have
filed with the Securities and 

                                      -8-
<PAGE>
 
Exchange Commission (or any governmental agency substituted therefor) or any
national securities exchange, and copies of all financial statements, reports
and proxy statements mailed to its stockholders.

               (d)  The Guarantor shall not, directly or indirectly, incur,
create, assume, guaranty or otherwise become or remain directly or indirectly
liable with respect to, any Indebtedness or liability, except unsecured
Indebtedness which satisfies the following conditions (any such Indebtedness
which satisfies such conditions being referred to as "Permitted Indebtedness"):

                    (i)  such Indebtedness shall be permitted pursuant to the
terms of Section 4.09 of the Indenture dated as of November 25, 1997 (the
"Indenture"), between the Guarantor and United States Trust Company of New York.

               (e)  If the Guarantor issues or sells any shares of its capital
stock or other equity interests or securities convertible into or exercisable
for any shares of its capital stock or other equity interests or issues or sells
any debt securities, it shall, within five days of such sale or issuance, make a
contribution to the capital of CTC-Del in an amount equal to the lesser of (i)
50% of the net cash proceeds of such sale or issuance and (ii) that amount of
such proceeds which, when added to Operating Cash Flow for the four quarter
period then ended or most recently ended, would cause the Leverage Ratio as of
the date of such issuance or sale to equal 5.0 to 1.0; provided, however, that
                                                       --------  -------
the Guarantor shall not be required to make any such capital contribution of the
proceeds of Permitted Indebtedness of up to $150,000,000 or the net proceeds of
up to $150,000,000 in the aggregate of the issuance or sale of shares of its
capital stock or other equity interests if at the time of receipt of such
proceeds the Leverage Ratio is less than 6.0 to 1.0.

               (f)  The Guarantor shall (i) hold itself out and identify itself
as a separate and distinct entity under its own name and not as a part of the
Borrowers and shall not fail to correct any known misunderstanding regarding its
existence separate and distinct from the Borrowers, (ii) maintain its accounts,
books and records separate from those of each Borrower, (iii) not commingle its
funds or assets with those of either Borrower and shall not permit either
Borrower to have direct access to its cash, (iv) hold all of its assets in its
own name and shall not permit either Borrower to acquire or dispose of any
assets on its behalf, (v) conduct business, to the extent permitted herein, in
its own name, (vi) not assume or guaranty or otherwise become obligated for the
debts of either Borrower or hold out its credit as being available to satisfy
the obligations 

                                      -9-
<PAGE>
 
of either Borrower except to the extent expressly provided by the Loan
Agreement, and (vii) allocate fairly and reasonably any overhead for office
space shared with either Borrower and shall use separate stationery, invoices
and checks from those used by either Borrower.

          7.  Security.  To secure timely payment of the Guaranteed Obligations
              --------                                                         
and performance in full of the obligations related thereto, the Guarantor has
entered into pledge agreements pursuant to which the Guarantor has granted to
the Agent, for the benefit of the Banks, first priority, perfected security
interests in all of the issued and outstanding capital stock of CTC-Del and of
the Holdco Affiliates.

          8.  Information.  The Guarantor assumes all responsibility for being
              -----------                                                     
and keeping itself informed of the financial condition and assets of the
Borrowers and of all other circumstances bearing upon the risk of nonpayment of
the Guaranteed Obligations and the nature, scope and extent of the risks which
the Guarantor assumes and incurs hereunder, and agrees that neither the Agent
nor any Bank shall have any duty to advise the Guarantor of information known to
any of them regarding such circumstances or risks.

          9.  Reinstatement.  The Guarantor agrees that this Guaranty shall
              -------------                                                
continue to be effective or be reinstated, as the case may be, if at any time
any payment, or any part thereof, of principal of, interest on or any other
amount with respect to the Guaranteed Obligations is rescinded or must otherwise
be restored by the Agent or any Bank upon the bankruptcy, insolvency or
reorganization of the Borrowers, the Guarantor or any other Person.

          10.  Subrogation and Subordination.  Until the indefeasible payment in
               -----------------------------                                    
full of the Guaranteed Obligations, the termination of the Commitments under the
Loan Agreement and the cancellation of all outstanding Letters of Credit, the
Guarantor hereby waives any claim, right or remedy, direct or indirect, that the
Guarantor now has or may hereafter have against either Borrower or its assets in
connection with this Guaranty or the performance by the Guarantor of its
obligations hereunder, in each case whether such claim, right or remedy arises
in equity, under contract, by statute, under common law or otherwise, including,
without limitation (a) any right of subrogation, reimbursement or
indemnification that the Guarantor now has or may hereafter have against a
Borrower, (b) any right to enforce, or to participate in, any claim, right or
remedy that the Agent or the Banks now have or may hereafter have against a
Borrower or any other guarantor, and (c) any benefit of, and any right to
participate in, any collateral or security now or hereafter held by the Agent or
the Banks.  In addition, until the Guaranteed 

                                     -10-
<PAGE>
 
Obligations shall have been indefeasibly paid in full, the Commitments shall
have terminated and all outstanding Letters of Credit shall have been canceled,
the Guarantor shall withhold exercise of any right of contribution that the
Guarantor may have against any other guarantor of the Guaranteed Obligations at
law or in equity or otherwise. The Guarantor further agrees that, to the extent
the waiver of its rights of subrogation, reimbursement, indemnification and
contribution as set forth herein is found by a court of competent jurisdiction
to be void or voidable for any reason, such rights of subrogation, reimbursement
or indemnification that the Guarantor may have against a Borrower or against any
collateral or security, and any rights of contribution that the Guarantor may
have against any such other guarantor, shall be junior and subordinate to any
rights that the Agent and the Banks may have against the Borrowers, to all
right, title and interest the Agent or the Banks may have in any such collateral
or security, and to any right the Agent or the Banks may have against such other
guarantor. The Agent or the Banks may use, sell or dispose of any items of
collateral or security as they see fit without regard to any subrogation rights
arising out of this Guaranty that the Guarantor may have and, upon any such
disposition or sale, any rights of subrogation that the Guarantor may have
shall, with respect to the collateral disposed of, terminate. If any amount
shall be paid to the Guarantor on account of subrogation rights at any time when
all Guaranteed Obligations shall not have been paid in full in cash or the
Commitments under the Loan Agreement shall not have been terminated, or any
Letters of Credit shall remain outstanding, such amount shall be held in trust
for the Agent, on behalf of the Banks, and shall forthwith be paid over to the
Agent, for the benefit of the Banks, to be credited and applied against the
Guaranteed Obligations, whether matured or unmatured, in accordance with the
terms of the Loan Agreement, the Notes or any applicable Collateral Document.

          11.  Delays; Omissions.  No delay or omission by the Agent or any Bank
               -----------------                                                
in the exercise of any right under this Guaranty shall impair any such right,
nor shall it be construed to be a waiver thereof; nor shall any single or
partial exercise of any right hereunder preclude any other or further exercise
of any other right.

          12.  Modification.  Any term of this Guaranty may be amended and the
               ------------                                                   
observance of any term of this Guaranty may be waived (either generally or in a
particular instance and either retroactively or prospectively) only with the
written consent of the Guarantor and the Agent.  No waiver of any single breach
or default under this Guaranty shall be deemed a waiver of any other breach or
default.

                                     -11-
<PAGE>
 
          13.  Successors and Assigns.  This Guaranty is a continuing guaranty
               ----------------------                                         
and shall be binding upon the Guarantor and its successors and assigns, except
that the Guarantor shall not have the right to assign its rights hereunder.
This Guaranty shall inure to the benefit of the successors and assigns of the
Agent and the Banks and, in the event of any transfer or assignment of rights by
any Bank the rights and privileges herein conferred upon such Bank shall
automatically extend to and be vested in such transferee or assignee, all
subject to the terms and conditions hereof.

          14.  No Set-Off Rights.  The Agent and each Bank hereby agree and
               -----------------                                           
acknowledge that they have no right to set off, appropriate or apply any
deposits (general or special) or any other indebtedness at any time held or
owing by the Agent or any Bank to or for the credit or the account of the
Guarantor, against obligations or liabilities of the Guarantor to the Agent or
such Bank under this Guaranty.

          15.  GOVERNING LAW.  THIS AGREEMENT SHALL BE CONSTRUED IN ACCORDANCE
               -------------                                                  
WITH AND GOVERNED BY THE LAWS OF THE STATE OF OHIO (WITHOUT GIVING EFFECT TO ANY
CONFLICTS OF LAWS PROVISIONS CONTAINED THEREIN).  THE PROVISIONS OF THIS SECTION
HAVE BEEN FULLY DISCUSSED BY THE AGENT AND THE GUARANTOR AND SHALL BE SUBJECT TO
NO EXCEPTIONS.  THE GUARANTOR HAS MADE THIS CHOICE OF GOVERNING LAW KNOWINGLY
AND WILLINGLY AND AFTER CONSULTING WITH ITS COUNSEL.  NEITHER THE AGENT NOR THE
GUARANTOR HAVE AGREED WITH OR REPRESENTED TO THE OTHER THAT THE PROVISIONS OF
THIS SECTION WILL NOT BE FULLY ENFORCED IN ALL INSTANCES.

          16.  ENFORCEMENT.  The Guarantor (a) hereby irrevocably submits to the
               -----------                                                      
jurisdiction of the state courts of the State of Ohio and to the jurisdiction of
the United States District Court for the Northern District of Ohio, for the
purpose of any suit, action or other proceeding arising out of or based upon
this Agreement or the subject matter hereof brought by the Agent or its
successors or assigns, (b) hereby waives, and agrees not to assert, by way of
motion, as a defense, or otherwise, in any such suit, action or proceeding, any
claim that it is not subject personally to the jurisdiction of the above-named
courts, that its property is exempt or immune from attachment or execution, that
the suit, action or proceeding is brought in an inconvenient forum, that the
venue of the suit, action or proceeding is improper or that this Agreement or
the subject matter hereof may not be enforced in or by such court, (c) hereby
waives and agrees not to seek any review of judgment of any such Ohio state or
federal court by any court of any other jurisdiction which may be called upon to
grant an enforcement of such judgment and (d) hereby waives, to the fullest
extent permitted by law, and agrees not to assert, any right it may have to
claim or recover in any legal action or proceeding referred to in this Section
any 

                                     -12-
<PAGE>
 
special, exemplary, punitive or consequential damages.  The Guarantor hereby
consents to service of process by registered mail at the address at which
notices are to be given.  The Guarantor agrees that its submission to
jurisdiction and its consent to service of process by mail are made for the
express benefit of the Agent.  Final judgment against the Guarantor in any such
action, suit or proceeding may be enforced in other jurisdictions by suit,
action or proceeding on the judgment, or in any other manner provided by or
pursuant to the laws of such other jurisdiction; provided, however, that the
                                                 --------  -------          
Agent may at its option bring suit, or institute other judicial proceedings,
against the Guarantor in any state or federal court of the United States or of
any country or place where the Guarantor may be found or as required by
applicable law, rules and regulations.

          17.  WAIVER OF JURY TRIAL.  THE GUARANTOR, TO THE EXTENT PERMITTED BY
               --------------------                                            
LAW, WAIVES ANY RIGHT TO HAVE A JURY PARTICIPATE IN RESOLVING ANY DISPUTE,
WHETHER SOUNDING IN CONTRACT, TORT, OR OTHERWISE, BETWEEN THE AGENT AND THE
GUARANTOR ARISING OUT OF, IN CONNECTION WITH, RELATING TO, OR INCIDENTAL TO THE
RELATIONSHIP ESTABLISHED AMONG THEM IN CONNECTION WITH THIS GUARANTY, ANY NOTE
OR OTHER INSTRUMENT, DOCUMENT OR AGREEMENT EXECUTED OR DELIVERED IN CONNECTION
THEREWITH OR THE TRANSACTIONS RELATED THERETO.

          18.  COLLATERAL AGENT.  The parties hereby acknowledge and reaffirm
               ----------------                                              
that the Agent has been designated to act as agent for the Banks.  All rights
and remedies of the Agent hereunder may be exercised by the Agent on behalf of,
and as agent for, the Banks.  The Banks may, pursuant to the terms of the Loan
Agreement, appoint a successor agent, who shall, upon appointment, succeed to
all the rights and obligations of the Agent hereunder.  The Guarantor
acknowledges that the rights of the Agent hereunder are for the benefit of each
Bank, and that, upon the termination of the appointment of an agent under the
Loan Agreement and the failure of the Banks to appoint a successor agent
thereunder, the rights of the Agent under the covenants, conditions and
agreements hereof shall inure to the benefit of the Banks.  At any time or
times, in order to comply with any legal requirement in any jurisdiction, the
Agent may in good faith appoint one or more other Persons, either to act as co-
agent or co-agents, jointly with the Agent, or to act as separate agent or
agents on behalf of the Agent and the holders of the Guaranteed Obligations,
with such power and authority as may be necessary for the effectual operation of
the provisions hereof and may be specified in the instrument of appointment
(which may, in the discretion of the Agent, include provisions for the
protection of such co-agent or separate agent identical to the provisions
herein).

                                     -13-
<PAGE>
 
          19.  NOTICES.  All notices, demands and requests required or permitted
               -------                                                          
to be given under the provisions of this Guaranty shall be in writing and shall
be deemed to have been duly delivered and received if given in accordance with
the provisions of the Loan Agreement with the address of the Guarantor being the
address of the Borrowers in the Loan Agreement.

          20.  SEVERABILITY.  Every provision of this Guaranty is intended to be
               ------------                                                     
severable.  In case any one or more of the provisions of this Guaranty shall for
any reason be held to be invalid, illegal or unenforceable in any respect, such
invalidity, illegality or unenforceability shall not affect (a) any other
provision hereof, (b) the validity, legality or enforceability of the remainder
of this Guaranty, or (c) the application of such provision(s) to Persons or
circumstances other than those to which it was held to be invalid, illegal or
unenforceable.

          21.  HEADINGS.  Section headings used herein are for convenience only
               --------                                                        
and are not to affect the construction of or be taken into consideration in
interpreting this Guaranty.

          22.  PRONOUNS.  Any pronoun used herein shall be construed in the
               --------                                                    
person, number and gender which is appropriate in the context.

          23.  EFFECTIVENESS.  This Guaranty shall be effective and shall
               -------------                                             
supersede the Amended and Restated Holdco Guaranty dated as of October 31, 1997,
upon receipt by the Agent for the benefit of the Banks of payment of all amounts
outstanding under the Loan Agreement from the proceeds of the offering by the
Guarantor of senior discount notes pursuant to the Indenture.

                                     -14-
<PAGE>
 
          IN WITNESS WHEREOF, the Guarantor has caused this Amended and Restated
Limited Holdco Guaranty to be duly executed as of the day and year first written
above.



                              CROWN CASTLE INTERNATIONAL CORP.,
                              formerly known as "Castle Tower 
                              Holding Corp."


                              By: /s/ DAVID L. IVY
                                 -------------------------------------
                              Name: David L. Ivy
                                   -----------------------------------
                              Title: President
                                    ----------------------------------

<PAGE>
 
                                                                    Exhibit 10.9

                          MEMORANDUM OF UNDERSTANDING
                                        
                     REGARDING MANAGEMENT AND GOVERNANCE OF
                         CASTLE TOWER HOLDING CORP. AND
                           CROWN COMMUNICATIONS, INC.



          The purpose of this Memorandum is to set forth in summary outline form
the principal objectives to be pursued and the principal procedures to be
implemented in connection with the management, governance and operations of the
domestic business of Castle Tower Holding Corp. (together with any successor or
assign, "Castle") and Crown Communications, Inc. (together with Crown Network
         ------                                                              
Systems, Inc. and Crown Mobile Systems, Inc., "Crown Communications"), and all
                                               --------------------           
other domestic subsidiaries or other operating units of Castle, as follows:



A.  Principal Objectives
    --------------------
 
    .  All parties recognize the significance of the business combination of
       Castle and the business and operations conducted by Robert A. Crown and
       Barbara Ann Crown (together, the "Crowns") as "Crown Communications" and
                                         ------                                
       Crown Network Systems, Inc. and Crown Mobile Systems, Inc. (such acquired
       businesses being referred to collectively as the "Crown Businesses")
                                                         ----------------  
       including the exciting opportunities from combining the experience and
       talent of the Crown Businesses' management team with the proven capital-
       raising abilities of Castle.

    .  Castle will be managed with a view towards enhancing the long-term growth
       and profitability of the enterprise and the interests of its
       shareholders.  To that end, Castle will continue to pursue its growth
       policies, reflected by its successful acquisition program culminating in
       the business combination today with the Crown Businesses.

    .  The Crowns, for themselves and the existing Crown management team,
       recognize the importance of the business combination and agree to
       facilitate a prompt and smooth transition of ownership and operation of
       the Crown Businesses within the Castle enterprise.

    .  Castle recognizes that in order to achieve its current expansion plans,
       Crown, without  the addition of any new EBITDA, will likely experience a
       reduction in projected EBITDA as a result of significantly increased
       general and administrative, engineering and other infrastructure costs
       needed to support expected growth.

    .  Effective communication and teamwork will be important objectives
       throughout the Castle organization.

    .  This Memorandum of Understanding is intended to supplement in certain
       respects the Amended and Restated Stockholders Agreement ("Stockholders
                                                                  ------------
       Agreement") of Castle.
       ---------             
<PAGE>
 
B.  Crown Communications
    --------------------

    .  In his capacity as President and Chief Executive Officer, Robert A. Crown
       will be fully authorized to manage and direct the day-to-day operations
       of Crown Communications.  Mr. Crown will endeavor to manage and operate
       these businesses in a manner consistent with the historic operations of
       the Crown Businesses.  Without limiting the generality of the foregoing,
       Mr. Crown's responsibilities and authority will include negotiation and
       completion of significant operating contracts, major personnel decisions,
       and the design, construction, operation and maintenance of Crown
       Communications facilities.  Mr. Crown will also participate in any
       important transactions involving acquisitions or dispositions of business
       units, joint ventures or other alliances and significant contractual
       arrangements involving the current and future customers of the U.S.
       domestic operations.

    .  With respect to Crown Communications, Mr. Crown's current and future
       recommendations for the staffing, promotion and compensation of corporate
       and senior executive officers shall be implemented to the fullest extent
       practicable.  To that end, the following individuals will hold the
       corporate offices set forth opposite their names for Crown
       Communications:

          Robert A. Crown      President and Chief Executive Officer

          Giuseppe A. Floro    Senior Vice President-Operations and Treasurer

          Barbara Ann Crown    Executive Vice President and (on a temporary 
                               basis) Corporate Secretary

        Mr. Crown will select a full-time Corporate Secretary/in-house legal
        counsel for Crown Communications at the earliest practicable date.

    .  It is also contemplated that the Board of Directors of Crown
       Communications will consist of five members, as follows:

          Robert A. Crown

          Ted B. Miller, Jr.

          David L. Ivy

          Giuseppe A. Floro

          Robert J. Coury

    .  So long as Robert A. Crown and the Crown Related Transferees (as defined
       in the Stockholders Agreement) hold in the aggregate at least 5% of the
       outstanding Common Stock of Castle, Mr. Crown shall be entitled to
       nominate three of the five board members for Crown Communications. Mr.
       Crown will also be entitled to nominate at least one director for all
       other domestic subsidiaries of Castle.

                                       2
<PAGE>
 
C.  Executive Management Committee
    ------------------------------

    .  An Executive Management Committee consisting of at least four individuals
       (Messrs. Miller, Ivy, Crown and Green) shall be established by Castle for
       the purpose of facilitating communications and reviewing on a regular
       basis all aspects of the domestic operations of Castle, promoting the
       long-term growth and profitability of Castle, insuring that significant
       decisions affecting the domestic operations shall be completed smoothly
       and effectively, and insuring that corporate policies are adhered to
       throughout the Castle organization.

    .  The Executive Management Committee shall hold monthly meetings
       alternating the site of such meetings between Pittsburgh and Houston.

    .  The Executive Management Committee shall be encouraged to invite other
       key corporate and operating management of Castle and its domestic
       subsidiaries to participate in meetings as they deem appropriate.

    .  The Executive Management Committee will select appropriate means for
       communicating on a regular basis with the full Board of Directors of
       Castle and key operating management of the domestic operations.

    .  The Executive Management Committee will also develop appropriate means
       for implementing clear lines of reporting responsibilities and for
       corporate approval processes (e.g., capital expenditures, budget approval
       and significant contracts).

D.  Equity Based Incentives
    -----------------------

    .  Castle has advised Mr. Crown that it is in the process of completing
       definitive and comprehensive equity based incentive compensation programs
       for key management personnel of Castle and its subsidiaries, including
       Crown Communications.  Castle's existing stock option plan and/or any
       future definitive plans will reflect the following agreed allocation of
       options covering shares of Castle Class B Common Stock:

              .  With respect to options covering a total of 604,000 shares of
                 Castle Class B Common Stock that are presently available, an
                 aggregate of 300,000 shares will be allocated to management of
                 Crown Communications.

              .  An aggregate of 167,000 of such 300,000 options will be
                 allocated in accordance with the terms and conditions set forth
                 in the attached Exhibit. The remaining 133,000 options will be
                 allocated to existing and future management of Crown
                 Communications following approval by Castle's Compensation
                 Committee (or separate Stock Option Committee, if applicable)
                 in the normal course of business, giving due regard to the
                 views and recommendations of Mr. Crown.

    .  In allocating these options, Castle will give due regard to the views and
       recommendations of Mr. Crown's regarding appropriate incentives needed to
       attract and retain talented management employees.

                                       3
<PAGE>
 
E.  Other
    -----

    .  For so long as either (a) Robert Crown and the Crown Related Transferees
       (as defined in the Stockholders Agreement) own at least 5% of the
       outstanding Castle Common Stock or (b) Robert Crown serves as President
       and Chief Executive Officer of Crown Communications, Castle's domestic
       operations will maintain its headquarters in Pittsburgh, Pennsylvania.

    .  Castle will obtain comprehensive directors and officers liability
       insurance coverage for all directors and officers of Castle and Crown
       Communications (including Mr. and Mrs. Crown) as promptly as practicable,
       but in any event not later the effective date of any public offering of
       debt or equity securities.

    .  Castle and all its domestic subsidiaries (including Crown Communications)
       shall pursue and obtain all necessary corporate and shareholder approvals
       in order to fully implement this Memorandum in accordance with applicable
       law and contracts.

    .  This Memorandum shall remain in full force and effect following any
       "rollup" or reorganization or other corporate transaction involving
       Castle.

    .  If and to the extent this Memorandum conflicts with any transaction
       document executed with regard to the business combination of Castle and
       the Crown Businesses (the "Transaction Documents"), the Transaction
                                  ---------------------                   
       Documents shall be deemed controlling.


     WITNESS the due execution hereof as of August 15, 1997.



                                    CASTLE TOWER HOLDING CORP.



                                    By   /s/ David Ivy
                                      ---------------------------------

                                    Its  President
                                       --------------------------------


                                        /s/ Robert A. Crown
                                    -----------------------------------
                                    Robert A. Crown


                                        /s/ Barbara Ann Crown
                                    -----------------------------------
                                    Barbara Ann Crown

                                       4

<PAGE>
                                                                   EXHIBIT 10.10

                           SITE COMMITMENT AGREEMENT

     THIS SITE COMMITMENT AGREEMENT (this "Agreement"), dated as of July 11, 
1997, is between Nexel Communications, Inc., a Delaware corporation ("NCI") and 
Castle Tower Corporation, a Delaware corporation ("Castle").

                                   RECITALS

     On October 2, 1996, NCI, Castle and Pittencrieff Communications, Inc. 
entered into a letter agreement (as amended by subsequent extension letters, the
"Letter Agreement") which contemplated, subject to the satisfaction of certain 
conditions, that the parties would subsequently enter into one or more 
definitive agreements. Following further discussions and negotiation, the 
parties agreed to modify certain terms of the agreements contemplated by the 
Letter Agreement. This Agreement constitutes one of the definitive agreements 
contemplated to be entered into between NCI and Castle, as so modified. Pursuant
to the Letter Agreement, NCI and Castle desire to enter into an arrangement by 
which NCI will offer Castle certain opportunities relating to the construction 
and lease, or purchase and lease-back, of communications sites to be used in 
part by Nextel.

     NOW, THEREFORE, in consideration of the mutual promises and covenants 
hereinafter set forth, and other good and valuable consideration, the receipt 
and sufficiency of which are hereby acknowledged, and pursuant to the 
requirements of the Letter Agreement, NCI and Castle agree as follows:

                           ARTICLE I  DEFINED TERMS

     The following terms as used in this Agreement shall, unless the context 
otherwise requires, have their respective meanings indicated below:

          (a)  "Acceptance Notice" shall have the meaning provided in Section 
3.2(c).

          (b)  "Accepted Project" shall have the meaning provided in Section 
3.2(b).

          (c)  "Additional Equipment" shall have the meaning provided in Section
3.4.

          (d)  "Additional New Site" shall have the meaning provided in Section 
3.2(b).

          (e)  "Affiliate" means any entity which the party in question (or an 
Affiliate of the party in question) directly or indirectly controls, is 
controlled by, or is under common control with, through the ownership or control
of equity interests.

          (f)  "Base Equipment" shall have the meaning provided in Section 3.4.

          (g)  "Build Period" shall have the meaning provided in Section 3.1.

          (h)  "Castle/Crown Effective Date" shall mean the date of consummation
of the proposed merger of Castle with Crown.

          (i)  "Closing" means the consummation of a purchase and sale of an 
Existing Tower Site or a Purchased Site, under the terms of the Purchase 
Agreement.

          (j)  "Communication Equipment" shall have the meaning provided in 
Section 3.2(a).

1

<PAGE>
 
          (k)  "Completion Notice" shall have the meaning provided in Section 
3.2(b).

          (l)  "Construction Approvals" means all necessary approvals from 
applicable governmental authorities relating to Site acquisition and 
development, including, without limitation, building and FAA permits, zoning 
approvals and FCC approvals (if any).

          (m)  "Construction Period" shall have the meaning provided in Section 
3.2(d).

          (n)  "Construction Schedule" shall have the meaning provided in 
Section 3.2(d).

          (o)  "Crown" means Crown Network Systems, Inc.

          (P)  "Crown Territory" shall have the meaning provided in Section 
3.1(b).

          (q)  "Dallas/Houston Site" shall have the meaning provided in Section 
3.2(a).

          (r)  "End Date" shall have the meaning provided in Section 3.5.

          (s)  "Existing Tower Sites" means the communications towers or 
monopoles identified on SCHEDULE 1 (as such SCHEDULE may be revised in 
accordance with Section 2.1), including the Tower Assets and Communication 
Equipment associated therewith, as further identified in Section 2.4.

          (t)  "Expedited Project" shall have the meaning provided in Section 
3.2(g).

          (u)  "Final Approvals" means all Construction Approvals, together with
other necessary approvals from applicable governmental authorities relating to 
the occupancy and use of a Site by Nextel, including, without limitation, a 
certificate of occupancy, if available.

          (v)  "Force Majeure" means any of the following events: delays in 
delivery of construction materials, including towers and monopoles, if provided
by Nextel or a vendor approved by Nextel, delays in zoning or permitting (other
than delays resulting from or occasioned by Castle's pursuit of any
modifications or supplements to the zoning and permitting completed by Nextel
prior to delivery of the Completion Notice), strikes, lockouts, labor disputes,
embargoes, flood, earthquake, storm, dust storm, lightning, fire, and any other
weather conditions that prevent (according to the tower construction industry's
standard of prudence) construction for any calendar day(s) in excess of the four
(4) "weather days" provided for in each Construction Schedule, epidemic, acts of
God, war, national emergency, civil disturbance or disobedience, riot, sabotage,
terrorism, threats of sabotage or terrorism, restraint by court order or order
of public authority, and similar occurrences beyond the reasonable control of
Castle, and such non-performance shall be excused for the period of time any
such Force Majeure causes such non-performance.

          (w)  "Guaranty" means the Guaranty Agreement to be entered into by 
NFC, in the form attached hereto as EXHIBIT "C".

          (x)  "Initial Closing Date(s)" means the date(s) of closing under the 
Purchase Agreement for the purchase and sale of the Existing Tower Sites with 
respect to which the Option is exercised.

          (y)  "Initial Notice" shall have the meaning provided in Section 
3.2(b).

          (z)  "Net Cash Flow" shall have the meaning provided in Section 2.2.

2

<PAGE>
 
          (aa) "New Sites" means all locations for the construction of new 
communications towers or monopoles for use by Nextel (including Tower Assets and
Communication Equipment associated therewith) but for which required building 
permits have not been obtained, as of the date hereof, and in the event the New
Site is acquired by Castle, on which Nextel would become an anchor tenant (on 
terms consistent with those set forth in this Agreement).

          (bb) "Nextel" means the applicable Affiliate of NCI which will offer 
to sell the Existing Tower Sites and Purchased Sites and enter into the Nextel 
Lease for any given Site.

          (cc) "Nextel Lease" means the lease agreement to be entered into 
between Castle and Nextel for each Site leased by Nextel from Castle, in the 
form attached hereto as EXHIBIT "B".

          (dd) "Nextel's Construction Cost" means, as to a Purchased Site being 
acquired by Castle (or a Digital Existing Tower Site added in a supplement to 
SCHEDULE 1), Reimbursable Costs plus any additional reasonable actual costs 
previously paid or incurred by Nextel which are attributable to construction or 
acquisition by Nextel of the Tower Assets; provided that no cost will be deemed 
not to be reasonable if its payment or incurrence is consistent with 
information provided to Castle in the Initial Notice.

          (ee) "NFC" means Nextel Finance Company, a Delaware corporation.

          (ff) "Option" shall have the meaning set out in Section 2.1.

          (gg) "Owner's Title Policy" means an owner's policy of title insurance
which insures either the fee simple title or the leasehold interest being 
conveyed in a Site, subject only to the Permitted Exceptions.

          (hh) "PCI/NCI Effective Date" shall mean the date of the closing under
the Amended and Restated Agreement of Merger and Plan of Reorganization, dated 
as of December 3, 1996, by and among NCI, NFC, DCI Merger Inc., and Pittencrieff
Communications, Inc., as the same may be amended from time to time by the 
parties thereto.

          (ii) "Permitted Exceptions" means as to any Site (i) title 
encumbrances or exceptions set forth in the title commitment which do not 
materially and adversely affect the intended use of the Site, such as, by way of
example and not of limitation, utility easements, and (ii) standard preprinted 
exceptions to be set out in the Owner's Title Policy; and (iii) any title 
encumbrances or exceptions identified in the title report delivered to Castle as
part of the Initial Notice.

          (jj) "Person" means any individual, corporation, partnership, limited 
liability company, firm, joint venture, association, joint-stock company, trust,
unincorporated organization, governmental or regulatory body or other entity.

          (kk) "Preexisting Contract" shall have the meaning set out in Section 
4.3.

          (ll) "Purchase Agreement" means the agreement for the purchase and 
sale of Existing Tower Sites with respect to which the Option is exercised, or 
of the Purchased Sites, the form of which is attached hereto as EXHIBIT "A".

          (mm) "Purchase Notice" shall have the meaning set out in Section 
3.2(c).

          (nn) "Purchase Price" shall have the meaning set out in Section 2.2.

          (oo) "Purchased Site" shall have the meaning set out in Section 3.3.

3




<PAGE>
 
          (pp) "Reimbursable Costs" means, as to a Site being acquired by Castle
under Article III (or a Digital Existing Tower Site added in a supplement to
SCHEDULE 1), those actual costs previously paid or incurred by Nextel which are
attributable solely to Site development (including site acquisition costs and
zoning approval) such as, without limitation, title insurance and survey costs,
outside attorneys' fees and direct costs associated with Construction Approvals
and Final Approvals, but shall exclude any such costs which exceed reasonable
and customary expenditures based on market conditions and competitive market
rates for such services or equipment. Reimbursable Costs do not include any
costs relating to shelter costs (when Nextel will own and exclusively use the
shelter), radio frequency engineering, administrative costs, indirect costs or
overhead or profit. In cases in which Site Acquisition Work is undertaken by
Nextel directly, without use of outside contracted service providers,
Reimbursable Costs shall mean the sum of either (i) [*], if the Site Acquisition
Work undertaken by Nextel with respect to the applicable Site included obtaining
zoning approvals or designations related thereto; or (ii) [*], if the Site
Acquisition Work undertaken by Nextel did not include obtaining such zoning
approvals or designations.

          (qq)   "Site" means, individually, a New Site, an Additional New Site 
or an Existing Tower Site, as applicable.

          (rr)   "Site Acquisition Work" means, with respect to each New Site or
Additional New Site, taking all of the following actions in compliance with all 
applicable laws: (i) obtaining from a qualified surveyor a recent (i.e. prepared
or updated no more than six (6) months prior to the Completion Notice given by 
Nextel to Castle with respect thereto) on-the-ground survey depicting the 
boundaries and areas of the site location, all easements, rights-of-way and 
other matters affecting title thereto, any improvements thereon, applicable 
set-back lines, if any, information regarding flood plain location and any 
encroachments affecting the site, (ii) obtaining all building permits and FAA 
and FCC approvals (if any) needed to construct Tower Assets on such site, (iii) 
obtaining all zoning approvals or designations necessary to construct and 
operate Tower Assets on such Site, (iv) obtaining an environmental transaction 
screening (as defined in the ASTM) of such Site and a related report, which 
report shall be addressed to Nextel and Castle and (v) obtaining a title 
commitment or abstract for each Site current within six (6) months of the 
Completion Notice.

          (ss)   "Site Agreement" shall have the meaning provided in Section 
3.2(a).

          (tt)   "Term" shall have the meaning set out in Section 4.3.

          (uu)   "Territory" shall have the meaning set out in Section 3.1(b).

          (vv)   "Territory Reduction Right" shall have the meaning provided in 
Section 3.1.

          (ww)   "Tower Assets" shall have the meaning provided in Section 
3.2(a).

     Terms may be defined above in either their singular or plural form, but may
also be used in this Agreement in their other form not expressly defined above.

                          ARTICLE II PURCHASE OPTION

          Section 2.1    GRANT OF OPTION.  In consideration of the mutual 
                         ---------------
covenants and agreements set forth herein, NCI hereby grants to Castle an 
exclusive and irrevocable option (the "Option") for period of one hundred and 
twenty (120) days from and after the date hereof (the "Option Term") to purchase
up to fifty (50) of the Existing Tower Sites, as set forth on SCHEDULE 1 hereto.
From and after the date hereof until the end of the Option Term, Nextel shall 
permit representatives of Castle, upon reasonable prior notice, during normal 
business hours, to inspect each of the Existing Tower Sites and to examine such 
contracts, records, permits,

4

[*] Indicates where text has been omitted or pursuant to a request for
confidential treatment. The omitted text has been filed with the Securities and
Exchange Commission separately.



<PAGE>
 
technical specifications and plans related to any of the Existing Tower Sites as
may be in Nextel's possession or under its control and to furnish such
representatives with all such information as they may reasonably request. Any
information provided to Castle pursuant to this Section 2.1 is subject to the
confidentiality provisions set forth in Section 4.14. During the Option Term, in
the event either party identifies any towers that were owned by Nextel on the
date hereof in any of the States of Texas or Florida, or the Denver, Colorado or
Philadelphia, Pennsylvania metropolitan areas, but which were not listed on
SCHEDULE 1, Nextel shall promptly supplement such SCHEDULE to add such towers
(and provide Castle with Notice thereof), and such towers shall be deemed
"Existing Tower Sites" subject to the Option and for all other purposes hereof,
provided, however, that SCHEDULE 1 need not be supplemented to include, and the
- --------  -------
Option shall not be deemed to cover, any towers acquired by Nextel from and
after the date hereof, including, without limitation, those acquired as a
consequence of the occurrence of the PCI/NCI Effective Date; and,
notwithstanding any supplement to such SCHEDULE, (i) the Option Term shall not
be extended beyond the 120-day period noted above, and (ii) the Option shall not
be expanded beyond the right to purchase up to fifty (50) Existing Tower Sites.

     Section 2.2    PAYMENT. As consideration for the purchase of an Existing
                    -------
Tower Site, Castle shall pay NCI the "Purchase Price" (as hereinafter defined)
for such Existing Tower Site with respect to which Option is exercised, by wire
transfer of immediately available funds on the Initial Closing Date with respect
thereto. In the case of any Existing Tower Site designated as a "Digital" Site
on SCHEDULE 1 hereto (including any supplement thereto), the Purchase Price
shall be the price indicated on such SCHEDULE (or supplement) for such Site
(which, in the case of Digital Existing Tower Sites added in any such
supplement, shall be an amount equal to Nextel's Construction Cost with respect
thereto). In the case of any Existing Tower Site designated as an "Analog" Site
on SCHEDULE 1 hereto (including any supplement thereto), the Purchase Price
shall be the greater of the price indicated on such SCHEDULE (or supplement) for
such Site (which, in the case of Analog Existing Tower Sites added in any such
supplement, shall be an amount equal to the estimated replacement cost
reasonably determined by Nextel with respect thereto) or eight (8) times Net
Cash Flow. "Net Cash Flow" for any "Analog" Site shall equal gross revenue from
third party tenants unaffiliated with Nextel derived from such Site in the last
calendar month preceding the Option Exercise Date with respect thereto (adjusted
for non-monthly billing), less (i) an administrative fee equal to ten percent
(10%) of such gross revenue, (ii) any monthly amounts subject to revenue sharing
arrangements with third parties unaffiliated with Nextel and (iii) monthly rent
payable by Nextel under the ground lease associated with such Site; times twelve
(12).

     Section 2.3    EXERCISE OF OPTION. The Option may be exercised form time to
                    ------------------  
time during the Option Term, with respect to up to fifty (50) of the Existing
Tower Sites, in the aggregate, by delivery to NCI of written notice of election
to exercise, identifying those Existing Tower Sites which Castle has opted to
purchase. Included with notice of exercise, Castle may include a summary sheet
specifying the particular Existing Site's specifications (including existing
tenants and rental rates) assumed by Castle in making its decision to exercise
the Option with respect to the Existing Tower Site. If, at the time of the
Initial Closing with respect to such Site, such specifications vary in any
respect from those (if any) set forth in the notice of exercise (including,
without limitation, as a result of a site lease entered into By Nextel with
respect to such Existing Tower Site, described in Section 2.5), Nextel will so
notify Castle in writing and Castle may elect not to consummate the purchase of
such Existing Tower Site.

     Section 2.4    TERMS OF PURCHASE: NEXTEL LEASE.
                    -------------------------------

              (a) The parties hereby agree that within thirty (30) days
following the initial exercise of the Option, they shall execute a Purchase
Agreement in the form of EXHIBIT A hereto, providing, inter alia, for the
purchase and sale of the Existing Tower Sites with respect to which the Option
is exercised and (i) the assignment or, if assignment is not permitted, sublease
of any underlying ground lease for such Site or (ii) in cases in which Nextel is
the owner of the underlying land, a ground lease, with Nextel as lessor,
providing for a twenty-five (25) year term, at a monthly rental rate of [*],
with the right exercisable by either party at any time during the lease term to
require the purchase and sale of the underlying parcel for a cash purchase price
of [*] for each such parcel. The parcel covered by such lease and purchase right
described in clause (ii) shall be of a size and configuration sufficient to
accommodate the then existing tower assets and reasonable space for additional
equipment shelter, if necessary, as mutually agreed by

5

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
the parties. In connection with any such lease or sale, the parties shall grant 
each other such easements or other perpetual contractual rights of access to and
from their respective adjoining parcels as may be reasonably necessary.

          (b)  The specific assets to be conveyed to Castle for any Existing 
Tower Site with respect to which the Option is exercised shall be identified in 
a schedule to the Purchase Agreement with respect thereto at the time of 
execution thereof or supplement thereto. Castle acknowledges that the Purchase 
Prices specified on SCHEDULE 1 for the Existing Tower Sites do not include, nor 
will any purchase of such Site upon exercise of the Option include, any shelters
or buildings at any such Site or any equipment included in any such shelter or 
building (unless such Purchase Price is with respect to an "Analog" Site and is 
determined as a multiple of Net Cash Flow, in which case any such shelter, 
building or equipment shall be included in such purchase and sale, subject to 
the exclusions hereafter provided). The categories of assets to be included or 
excluded in the purchase and sale of Existing Tower Sites (either with or 
without shelter, building or equipment thereat) are identified on SCHEDULE 7. To
the extent the parties agree to include such shelter, building or equipment as 
part of a purchase, the determination of the assets to be included will be based
on the types of other shelter assets identified on SCHEDULE 7 and the purchase 
price therefor will be determined with reference to Nextel's cost for such 
assets. To the extent that assets other than those of the type categorized as 
either "Included" or "Excluded" on SCHEDULE 7 are identified at any particular 
Existing Tower Site with respect to which the Option is exercised, the parties 
shall mutually agree as to whether such assets should be included in or excluded
from the purchase, in a manner consistent with SCHEDULE 7. Following any 
additional exercises of the Option, supplemental exhibits to the Purchase 
Agreement will be added to include the additional Existing Tower Site(s) with 
respect to which the Option is exercised.

          (c) At the Initial Closing, Castle, as lessor, and Nextel, as lessee,
shall enter into a Nextel Lease for each such Existing Tower Site purchased by
Castle, in the form of EXHIBIT B hereto, providing for monthly rent (i) in the
case of "Digital" Sites, determined by reference to the rate schedule set forth
on SCHEDULE 2A; and (ii) in the case of "Analog" Sites, in the amount of [*] per
month. Such Nextel Lease (and monthly rent) shall cover the number of antennas
(or lines) and Communication Equipment, and at the height locations, then
maintained by Nextel at such Site. In addition, Nextel shall have a right of
first refusal to lease additional space within one designated twenty (20) foot
area, on/in such Existing Tower Site for Nextel's additional equipment, as
notified to Castle promptly following exercise of the Option with respect to
such Site. Such right, and the exercise thereof, shall be subject to the terms
of Section 3.4(c). Concurrently with the execution of the first Nextel Lease to
be entered into, NFC shall execute and deliver to Castle a Guaranty in the form
of EXHIBIT "C".

     Section 2.5    RESTRICTION OF TRANSFER. Except as otherwise contemplated 
                    -----------------------
herein, no direct or indirect sale, assignment, transfer, exchange or other 
disposition ("Transfer") of an ownership interest in any Existing Tower Site or 
any portion thereof or right of access with respect thereto may be made by 
Nextel from the date hereof until the end of the Option Term. Any purported or 
attempted Transfer of any such interest in any Existing Tower Site in violation 
of this Agreement shall be void and of no force and effect. Nor shall Nextel, 
from the date hereof until the end of the Option Term, solicit, make or accept 
any offers to sell, purchase, assign or otherwise transfer an ownership interest
in any Existing Tower Site. Notwithstanding the foregoing, until the exercise of
the Option with respect to a particular Existing Tower Site, Nextel may, 
providing it is operating in good faith and in a commercially reasonable manner,
after giving Castle ten (10) days written notice, enter into, modify or 
terminate site leases, as lessor, with any other Person, on such terms as may be
acceptable to Nextel, with respect to space on such Existing Tower Site; 
provided that Nextel may enter into, modify or terminate any such site lease,
notwithstanding an exercise of the Option by Castle following such notice with 
respect thereto.

          ARTICLE III CONSTRUCTION AND PURCHASE OF NEW SITES

          Section 3.1    NEW SITES.
                         ---------

6

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.



<PAGE>
 
          (a)  From and after the date hereof and until the "End Date", as 
hereinafter defined ("the Build Period"), Nextel agrees that is shall not 
construct or contract with a third party for the construction of a New Site in 
the Territory, without first complying with the provisions of this Article III, 
except for any New Site subject to a Preexisting Contract, or during a period 
following NCI's exercise of the "Territory Reduction Right" (as hereinafter 
defined) and prior to its receipt of notice of the Castle/Crown Effective Date, 
with respect to any New Site located in a portion of the Crown Territory 
affected by the exercise of such Territory Reduction Right.

          (b)  The "Territory" shall mean the geographic areas and highway 
corridors identified on SCHEDULE 3, provided that any time from and after 
January 1, 1998, in the event the Castle/Crown Effective Date has not 
theretofore occurred, NCI shall have the right (the "Territory Reduction 
Right"), by written notice to Castle, to delete from the Territory any or all of
the areas and corridors designated as a Crown Corridor on SCHEDULE 3 (the "Crown
Territory"), until such time as the Castle/Crown Effective Date occurs and 
Castle provides NCI with notice thereof. Notwithstanding any such exercise of 
the Territory Reduction Right, this Agreement shall remain in effect (x) for all
New Sites in the Territory other than those in the Crown Territory so deleted, 
(y) for all New Sites in the Crown Territory with respect to which an Acceptance
Notice or Purchase Notice (as such terms are hereinafter defined) has been 
delivered to Nextel, and (z) in all other respects, including, without 
limitation, Castle's Option to acquire the Existing Tower Sites, as described in
Article II.

     Section 3.2    IDENTIFICATION AND CONSTRUCTION OF SITE LOCATIONS.
                    -------------------------------------------------

     (a)  With respect to each New Site in the Territory, and each "Additional 
New Site" (as hereinafter defined) prior to the delivery of an "Initial Notice" 
(as hereinafter defined) with respect thereto, Nextel shall have entered into 
lease agreements or option agreements assignable to Castle (individually the 
"Site Agreement"; collectively the "Site Agreements") by and between Nextel, as 
lessee (or optionee), and certain lessors (or optionors) identified in the Site 
Agreements, for rights to certain portions of their land for the construction of
radio communications towers or monopoles and related assets including equipment 
shelters (collectively, "Tower Assets"), for the installation of wireless 
communication receivers, transmitters, other antenna devices and related 
communication equipment (collectively, "Communication Equipment"). During the 
Build Period, before constructing (or causing the construction of) any Tower 
Assets at any New Sites in the Territory for Nextel's own account and ownership 
or lease, Nextel will first grant Castle the opportunity to develop, construct, 
own, maintain and operate Tower Assets at such New Sites according to the 
remaining terms of this Article III, In addition to the foregoing, Nextel shall,
during the Build Period, provide Castle with Initial Notices with respect to at 
least eight (8) New Sites located in either the Dallas or Houston, Texas 
metropolitan areas (the "Dallas/Houston Sites").

     (b)  In connection with the development during the Build Period of each New
Site in the Territory, Nextel shall, following execution of a Site Agreement 
with respect thereto, provide Castle, in writing, the information enumerated on 
SCHEDULE 4; and in connection with the development during the Build Period of 
each "Additional New Site" (as hereinafter defined), Nextel may, but shall not 
be obligated, to following execution of a Site Agreement with respect thereto, 
provide Castle, in writing, the information enumerated on SCHEDULE 4. The notice
given in accordance with this Section 3.2(b) is referred to as the "Initial 
Notice." (For purposes hereof, "Additional New Sites" are New Sites that are not
located in the Territory, but which Nextel, in its sole discretion, may choose 
to offer Castle the opportunity to develop, construct, own, maintain and operate
either in accordance with the terms hereof or on other terms mutually agreed by 
the parties.) Whenever reasonably practicable, Nextel shall notify Castle of 
substantially all of the New Sites in the Territory proposed to be constructed 
within a highway corridor (as identified on SCHEDULE 3). If Castle provides 
Nextel an Acceptance Notice under Section 3.2(c) with respect to a New Site or 
Additional New Site (which Site shall then become and be referred to herein as 
an "Accepted Project"), Nextel may, but shall be under no obligation to, cause 
Site Acquisition Work with respect thereto, together with all information 
included in the Initial Notice, as amended, and any notice of expedited 
construction of the Tower Assets (the "Completion Notice"). In undertaking Site 
Acquisition

7
<PAGE>
 
Work with respect to an Accepted Project, Nextel shall exercise its reasonable 
best efforts to accommodate the reasonable requests of Castle to pursue zoning 
and permitting approvals necessary for the construction of the Tower Assets in 
the manner desired by Castle; provided, however, that Nextel shall be under no 
obligation to accommodate any such request if to do so would, in Nextel's 
judgment, be reasonably likely to jeopardize or delay the completion of Site 
Acquisition Work with respect to such Accepted Project.

          (c)  Within ten (10) business days after Castle has received the 
Initial Notice, Castle shall provide Nextel written notice of its desire to 
either (i) develop, construct, own and operate Tower Assets at the New Sites or 
Additional New Sites (the "Acceptance Notice"); (ii) purchase the Tower Assets 
at the New Sites or Additional New Sites following the development and 
construction thereof by Nextel (the "Purchase Notice") or (iii) waive without 
condition any and all rights granted hereunder with respect to such New Site or 
Additional New Site, including, without limitation, its rights to develop, 
construct or purchase such Site. Castle shall be deemed to have elected the 
waiver described in clause (iii) if it fails to provide Nextel with an 
Acceptance Notice or a Purchase Notice within such ten (10) day period described
in the preceding sentence.

          (d)  Castle shall construct (or, in the case of Accepted Projects in 
the Crown Territory, shall cause Crown to construct) each Accepted Project 
according to the minimum tower height specifications and ground or surface space
specifications in order to accommodate a 10' X 20' (200sq.feet) equipment
shelter designated by Nextel in the Completion Notice and such construction
shall be completed by Castle (or Crown, as applicable) as quickly as
commercially reasonable but in any event within the Construction Period defined
herein. The term "Construction Period" means (i) the 60-day construction period
established in the Construction Schedule set forth as SCHEDULE 5, beginning on
the date of delivery of the Completion Notice, which Completion Notice shall not
be given until all necessary building permits and required FAA and FCC approvals
(if any) have been received; or (ii) such shorter period as is established by
mutual agreement of the parties with respect to an Expedited Project (as
hereinafter defined). In each case, the Construction Period may be extended by
reason of an event of Force Majeure, to the extent such Force Majeure is a
direct cause of the construction delay, or by agreement of the parties due to
the diversion of resources from a pending project to an Expedited Project.

          (c)  Such construction by Castle (or Crown, as applicable) shall 
include: (i) all site engineering, architectural and engineering drawings (as 
necessary) and geotechnical investigations (if geotechnical investigations are 
necessary in connection with the construction of Tower Assets that vary from 
that for which Nextel performed such investigations as part of the Site 
Acquisition Work); (ii) if necessary, construction of an access road suitable 
for pedestrian and vehicular ingress and egress; (iii) the construction of a 
communication tower complete with ground systems and tower lighting (as 
necessary); and (iv) except as otherwise provided in this Section 3.2(e), all 
other reasonable and customary installations. In addition, Castle may, at its 
option, expand the scope of its construction of an Accepted Project to include 
(x) the installation of a shared communication equipment shelter with an 
appropriate HVAC system installed, suitable for the installation of Nextel's 
Communication Equipment, as set forth in the Completion Notice, to include 
access to all necessary utilities; and (y) the installation of a stand-by 
generator for Nextel's non-exclusive use. In the event Castle chooses to include
such expanded construction, Nextel shall have the right, but not the obligation,
to include the use of such shelter and/or generator within the terms of the 
Nextel Lease (as hereafter defined) for the additional monthly rent described on
SCHEDULE 2. Completion of construction shall be certified by all governmental 
agencies required to give regulatory certification and shall be subject to 
acceptance by Nextel, which acceptance will not be unreasonably withheld. 
Acceptance by Nextel shall be upon written notice from Nextel to Castle that the
Accepted Project meets the specifications set forth in the Completion Notice. 
Nextel shall be permitted to designate representatives to have supervised access
to the construction site to review construction progress, including grounding, 
utility runs and easements, shelter location and antenna Platform. Nextel shall 
give written notice to Castle of any construction defect at the time Nextel 
becomes aware of such defect, or when a review of construction would have 
exposed such defect. Upon completion of the Accepted Project, Castle shall give 
Nextel written notice of completion. Nextel shall have five (5) calendar days 
thereafter to give its written acceptance or objections to construction, which 
objections shall

8

<PAGE>
 
be limited to those not previously waived. In addition to the foregoing, Castle 
shall have the right, but not the obligation, to provide the services identified
on SCHEDULE 6, on each Approved Project, if requested by Nextel, at the rates 
and on the terms therein specified. Castle shall notify Nextel whether or not it
wishes to provide such services with respect to an Approved Project, within (5) 
days following Nextel's request for such additional services.

          (f)  Upon completion of construction of an Accepted Project and 
acceptance thereof by Nextel, Nextel and Castle shall execute a Nextel Lease for
such completed New Site, in the form of EXHIBIT "B", with respect to the Base 
Equipment (as hereafter defined) and, subject to space availability, so much of 
the Additional Equipment (as hereafter defined) that the applicable Tower Assets
are able to accommodate, providing for monthly rent determined by reference to 
the rate schedule attached hereto as SCHEDULE 2B, all as further detailed in 
Section 3.4 hereof. Concurrently therewith, Nextel shall cause the applicable 
land lease agreements, options, permits, zoning approvals and other relevant 
site development items to be assigned to Castle free and clear of all liens and 
security interests (subject to Permitted Exceptions).

          (g)  From time to time, Nextel may request Castle to construct an 
Accepted Project in less than the 60-day period from the date of delivery of the
Completion Notice. Upon receiving the foregoing request, Castle shall provide 
Nextel a good faith estimate of all incremental expenses related to the proposed
expediting of the Accepted Project. On Nextel's notice of approval of the 
estimated cost to expedite the proposed construction of the Accepted Project, 
Castle shall within five (5) business days thereof notify Nextel in writing of 
its intention to either continue with the construction of the Accepted Project 
or reject the Accepted Project. If Castle elects to proceed with the 
construction of the Accepted Project on the expedited schedule (each, an 
"Expedited Project"), Castle will use its commercially reasonable efforts to 
complete the project on the schedule requested by Nextel. Castle shall provide a
good-faith estimate of all incremental expenses related to the Accepted Project 
that Castle would not have incurred but for the expedited schedule (such as 
stand-by charges and overtime expenses and compensation) and Nextel agrees to 
reimburse Castle for all such expenses thereof. Nextel shall have the right to 
approve all extraordinary expenses related to an Expedited Project not 
previously made known to Nextel. In the event Castle proceeds with the 
construction of an Expedited Project at Nextel's request, Nextel and Castle 
shall in good faith modify the construction schedule of any other pending 
projects in the event Castle's resources are diverted from pending projects to 
Expedited Projects to meet Nextel's expedited construction requests.

          (h)  In the event Castle fails to complete construction of an Accepted
Project within the Construction Period described above, then Nextel's sole and
exclusive remedy shall be to recover from Castle, and Castle shall, promptly
following notice, deliver to Nextel the sum of [*] for each Site that is not
constructed according to schedule. Castle shall have no liability for failing to
complete the construction of an Expedited Project within the schedule requested
by Nextel unless Castle fails to complete construction within the 60-day
Construction Period beginning on delivery of the Completion Notice with respect
thereto and, in such case, Nextel's sole and exclusive remedy shall be to
recover from Castle, and Castle shall, promptly following notice, deliver to
Nextel the sum of [*] for each Site that is not constructed according to
schedule.

          (i)  In the event Castle (or Crown, as applicable) fails to (i) 
commence construction of an Accepted Project in accordance with the Construction
Schedule or (ii) complete the installation of the Tower Assets for an Accepted 
Project in accordance with the Construction Schedule or (iii) complete the 
construction Schedule, Nextel may elect, at its sole option, on notice to 
Castle, subject to the cure right hereinafter described, to purchase the 
Accepted Project (including all real and personal property including the Tower 
Assets) that has been installed on such Site or that has been ordered by Castle 
for installation on such Site, and Nextel shall pay Castle an amount equal to 
Castle's costs for the foregoing items upon receipt of all supporting 
documentation evidencing such costs. In the event Nextel wishes to exercise its 
right under either of clause (i) or (ii), it shall notify Castle of such failure
and Castle shall have five (5)

9

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
business days from such Notice to effectuate a cure. In the event such cure is 
not effectuated within such five (5) day period, or, in the case of an exercise 
of the right under clause (iii), promptly following Notice with respect thereto,
Castle shall present to Nextel a bill of sale conveying Castle's right, title 
and interest in and to any and all personal property in the possession and under
the control of Castle with respect to the applicable Accepted Project/Expedited 
Project, free and clear of all liens and security interests (subject to 
Permitted Exceptions). Upon payment of such amount, Nextel shall have no further
obligation or liability to Castle for the Accepted Project/Expedited Project. 
Castle shall transfer or assign to Nextel (1) any warranties or guaranties 
pertaining to any of the Tower Assets to the extent allowed by such manufacturer
and (2) any technical information or documents related to the Tower Assets and 
the development and operation thereof. Nextel shall accept such real and 
personal property subject to all matters of the public records (other than any 
mortgage, deed of trust or security interest securing Castle's indebtedness for 
borrowed money) and any user contracts, licenses, or similar agreements by which
Castle has committed to provide space on the Tower Assets to any third party.

          Section 3.3    PURCHASED SITES. If Castle provides Nextel a Purchase 
                         ---------------
Notice under Section 3.2(c) with respect to a New Site or Additional New Site (a
"Purchased Site"), Nextel may, but shall be under no obligation to, complete the
development and construction of such New Site or Additional New Site. On notice
to Castle from Nextel of Nextel's completion of any Purchased Site, the parties
shall enter into the Purchased Agreement (if the Purchase Agreement had not
previously been executed in connection with the purchase of one or more Existing
Tower Sites or Purchased Sites) or addenda to the Purchase Agreement previously
executed will be added to include the additional Purchased Site(s). Such
Purchase Agreement shall be in the form of EXHIBIT "A", and provide for the
purchase and sale of such Site, for a purchase price equal to Nextel's
Construction Cost. Concurrently with the closing of the purchase and sale of the
Purchase Site, Nextel and Castle shall execute a Nextel Lease for such Purchased
Site, in the form of EXHIBIT "B", with respect to the Base Equipment (as
hereafter defined) and, subject to space availability, so much of the Additional
Equipment (as hereafter defined) that the applicable Tower Assets are able to
accommodate, providing for monthly rent determined by reference to the rate
schedule attached hereto as SCHEDULE 2B, all as further detailed in Section 3.4
hereof.

          Section 3.4    LICENSED SPACE.
                         --------------

          (a)  Castle shall notify Nextel fifteen (15) days prior to the then 
anticipated completion of each Accepted Project and Nextel shall notify Castle 
fifteen (15) days prior to the then anticipated completion of each Purchased 
Site and, (i) within five (5) days after receipt of such notice from Castle or 
(ii) concurrently with the delivery of its notice to Castle, Nextel shall notify
Castle of the number of antennas (or lines) on the constructed tower and the 
location thereon that Nextel desires to install equipment and of the associated 
space Nextel will require in equipment shelters. Nextel shall be required to 
designate not less than the number of antennas (or lines), specified in the 
Completion Notice at heights not lower than those specified in such notice 
(such equipment specified in the Completion Notice being referred to herein as 
the "Base Equipment") and if, notwithstanding the foregoing requirement, Nextel 
designates fewer antennas or antennas at lower heights than the Base Equipment, 
Nextel shall nonetheless be deemed to have designated at least three (3) 
antennas at height locations as specified in the Completion Notice, and will be 
required to enter into a Nextel Lease with respect to such equipment. If Nextel 
designates more antennas than set forth in the Completion Notice (the 
"Additional Equipment"), Castle shall allow Nextel to use such additional space 
on and in the Tower Assets as is necessary to operate the Additional Equipment; 
provided, Nextel acknowledges that Tower Assets may not be adequate, or have 
space available, to accommodate any or all of the Additional Equipment, and the 
failure of the Tower Assets to accommodate the Additional Equipment shall not 
effect in any manner Nextel's obligation with respect to the Base Equipment.

          (b)  Upon the execution of the applicable Nextel Lease (i) Castle
shall pay to Nextel an amount equal to the Reimbursable Costs attributable to
such Site as full reimbursement for costs incurred with the Site Acquisition
Work performed by Nextel for any Accepted Project or (ii) Castle shall pay to
Nextel an amount equal to Nextel's Construction Costs attributable to such Site
as full reimbursement for

10
<PAGE>
 
costs incurred with the Site Acquisition Work performed by Nextel and 
construction of any Purchased Site. Nextel shall indemnify and hold Castle 
harmless for any payment demands by contractors and other persons performing 
services in connection with the Site Acquisition Work hired by Nextel.

          (c)  Nextel shall have a one-time right of first refusal to lease 
additional space within one designated twenty (20) foot area, on/in the Tower 
Assets for the possible relocation of Nextel's equipment, as notified to Castle 
in the Completion Notice. For a period of three (3) years from the effective 
date of the applicable Nextel Lease, Castle shall give Nextel fifteen (15) days 
notice prior to entering into any lease for the space therefore identified by 
Nextel in the Completion Notice. Nextel shall, within ten (10) days following 
receipt of such notice, inform Castle of whether it intends to exercise its 
rights to such space. In the event Nextel chooses not to exercise its right to 
such space, the above described right of first refusal will thereafter expire 
and be of no further force or affect.

          (d)  In addition to Existing Tower Sites with respect to which the 
Option is exercised, Accepted Projects and Purchased Sites, Castle shall offer 
to enter into a Nextel Lease in form of EXHIBIT B, at least rates determined in 
accordance with the Rate Schedule set forth as SCHEDULE 2B, and subject only to 
space availability, for space requested by Nextel on any communications sites or
towers owned or operated by Castle in the Territory.

          Section 3.5  END DATE.  For purposes hereof, the "End Date" shall be 
                       --------
the date on which the sum of the number of all:

     (a)  New Sites in the Territory for which an Initial Notice is given, but 
with respect to which Castle either waives or is deemed to have waived its right
to construct or purchase such Site, provided that Nextel subsequently constructs
or contracts for the construction of such Site;

     (b)  New Sites (including Dallas/Houston Sites) and Additional New Sites
with respect to which, following delivery of the Initial Notice either (i)
Castle delivers an Acceptance Notice and Nextel delivers a Completion Notice; or
(ii) Castle delivers a purchase Notice and the parties subsequently enter into a
Purchase Agreement with respect thereto; and

     (c)  any other tower sites not otherwise subject to the terms of this 
Agreement which are sold by Nextel and purchased by Castle during the Build 
Period;

equals or exceeds two hundred and fifty (250), in the aggregate.

11

<PAGE>
 
                        ARTICLE IV  MISCELLANEOUS TERMS

          Section 4.1.  CO-LOCATION.
                        -----------

          (a)  Prior to executing any lease for any Site made available to 
Castle pursuant to this Agreement with a Person who owns or has access to other 
communication sites (including without limitation communications towers or 
monopoles), Castle shall use its best efforts to include in such lease a 
requirement that such Person grant Nextel the right, for each Site that Castle 
makes available to such Person, to locate Nextel equipment at one other site 
that such Person owns or has access to. Nextel's right to use any other site 
made available by the other Person shall be on commercially reasonable terms and
shall be subject to space availability at such site. Castle's use of "best 
efforts" as contemplated by this paragraph, shall only include a written request
by Castle to such Person as to the matter set forth in this paragraph, and shall
not include any requirement that Castle expend money or negotiate lease terms 
for the Person which are more favorable than its then quoted market rates

          (b)  Nextel shall have the authority to offer any other Person access
to any New Site in the Territory, Additional New Site or Existing Tower Site, to
be constructed or purchased by Castle, subject only to space availability and
the execution of Castle's standard commercial lease (at market rates). At
Nextel's request, Castle agrees to negotiate in good faith with any such other
Person identified by Nextel.

          Section 4.2.  TERMINATION.
                        -----------

          (a)  This Agreement shall be effective as of the date hereof and shall
continue in effect until the End Date, unless earlier terminated as provided 
herein (the "Term").

          (b)  Castle may terminate this Agreement prior to the end of the Term 
by written notice given to NCI upon the occurrence of either of the following 
events:

               (i)   the insolvency of NCI; suffering or committing any act of 
insolvency; or the inability of NCI to pay its debts when due; or

               (ii)  NCI's liquidation, whether voluntarily or unvoluntarily; or
the appointment for it of a receiver or liquidator.

          (c)  NCI or Nextel may terminate this Agreement prior to the end of 
the Term by written notice given to Castle upon the occurrence of any of the 
following events:

               (i)   the insolvency of Castle; suffering or committing any act 
of insolvency; or the inability of Castle to pay its debts when due;

               (ii)  Castle's liquidation, whether voluntarily or involuntarily;
or the appointment for it of a receiver or liquidator;

               (iii) at any time after December 31, 1997, if the PCI/NCI 
Effective Date has not theretofore occurred; or

               (iv)  Nextel has, within any continuous eight-month period during
the Term, exercised its rights to recover the penalty payment described under 
Section 3.2(h) and/or elected to purchase an Accepted Project under Section 
3.2(i), a number of times no fewer than the greater of five (5) or five percent 
(5%) of the aggregate number of Accepted Projects during such eight-month 
period.

12

<PAGE>
 
          (d)  Either Castle or NCI may terminate this Agreement in the event 
the other party is in breach of this Agreement (unless the breach is waived by 
the non-breaching party) and fails to cure such breach (i) in the case of breach
of an obligation to pay money, within twenty (20) days after written notice has 
been served on the breaching party by the non-breaching party indicating the 
nature of the breach of purported breach; or (ii) in the case of a non-monetary 
breach, (x) within forty five (45) days after written notice of the breach, or 
(y) if cure is not possible within such forty-five day period, one hundred and 
twenty (120) days after written notice of the breach, provided the breaching 
party continues to exercise reasonable diligence in effectuating a cure.

          (e)  Termination of this Agreement pursuant to this Section 4.2 shall 
be effective the day such notice is deemed given under Section 4.6 of this 
Agreement. The termination of this Agreement shall not discharge, affect or 
otherwise modify the rights and obligations of the parties under this Agreement 
which, by their terms and/or express intent, may require or contemplate 
performance subsequent to any such termination, including, without limitation, 
with respect to the completion of construction and sale and purchase of any New 
Sites or Additional New Sites that are Accepted Projects or Purchased Sites but 
for which Final Approvals, the execution of the Nextel Leases and/or Closing 
remain outstanding. In the event that this Agreement is terminated, all rights 
and obligations of Nextel and Castle set out in the executed Nextel Leases shall
remain in full force and effect, as provided therein.

          (f)  In the event that this Agreement is terminated, the terminating 
party's right to pursue all legal (and equitable) remedies for breach of 
contract and damages (and specific performance) shall survive such termination 
unimpaired, except as provided and limited by the provisions of Section 3.2(h) 
of this Agreement.

          (g)  Termination of this Agreement shall not affect the terms of the 
Purchase and Sale Agreement by and between Pittencrieff Communications, Inc. 
("PCI"), A&B Electronics, Inc. ("A&B"), and Castle (formerly known as Castle 
Communications Corporation), as amended, or the License Agreement dated as of 
January 10, 1995, by and among PCI, A&B, and Castle, as amended, which are being
amended by further amendments (the "Further Amendments") executed on or about 
the date this Agreement is being executed, except that in the event that this 
Agreement is terminated by NCI or Nextel under Section 4.2(c)(iii), such Further
Amendments shall be deemed null and void and of no further force or effect.

          Section 4.3  REPRESENTATIONS AND WARRANTIES OF NEXTEL.  NCI represents
                       ----------------------------------------
and warrants to Castle that:

          (a)  Corporate Status; Qualification.  NCI has been duly incorporated 
               -------------------------------
and is validly existing as a corporation in good standing under the laws of 
Delaware.

          (b)  Authority; Binding Obligation; Authorized.  NCI has all necessary
               -----------------------------------------
corporate power and authority to enter into this Agreement and to perform and to
cause each relevant Affiliate to perform the obligations to be performed by it 
hereunder. This Agreement constitutes a valid and legally binding obligation of 
NCI and is enforceable against NCI in accordance with its terms, and the 
execution, delivery and performance of this Agreement by NCI have been duly 
authorized by all requisite corporate action.

          (c)  No Breach.  The execution and delivery of this Agreement by NCI 
               ---------
and the performance of this Agreement by NCI and the relevant Affiliate will not
(i) conflict with any provision of the Amended and Restated Certificate of
Incorporation, or By-Laws of NCI or the Certificate or Articles of Incorporation
or By-Laws of such Affiliate; (ii) violate, conflict with, or result in the
breach of any of the terms of, result in a material modification of the effect
of, otherwise give any other contracting party the right to terminate, or
constitute (or with notice or lapse of time or both constitute) a default under,
any material contract or other agreement to which NCI or such Affiliate is a
party or by or to which it or they or any of its or their assets or properties
may be bound or subject; or (iii)

13

<PAGE>
 
conflict with or violate any provision of any law, rule, regulation, order, 
writ, judgment, injunction, decree, determination, or award having applicability
to NCI or such Affiliate.

          (d)  Towers. To the extent NCI or Nextel is responsible for the 
               ------
development of a particular Site hereunder, (i) each tower and other 
improvements on a Site acquired from NCI or Nextel by Castle has been or will be
built in accordance with the plans and specifications therefor, and in material 
compliance with all applicable governmental rules, regulations, and (ii) Final 
Approvals have been or will have been obtained by Nextel as to all Sites 
acquired by Castle from NCI or Nextel.

          (e)  Preexisting Contracts. (i) Except as set forth on SCHEDULE 8 
               ---------------------
attached hereto Nextel is not a party to any agreement or commitment (each, a 
"Preexisting Contract") with any Person (except the execution of this Agreement 
with Castle) for the construction or sale of any Existing Tower Site or New Site
within the Territory; and (ii) identified on SCHEDULE 8 are all locations for 
the construction of new communications towers or monopoles for use by Nextel in 
the Territory, for which required building permits have obtained, as of the date
hereof.

     Section 4.4    REPRESENTATIONS AND WARRANTIES OF CASTLE. Castle represents 
                    ----------------------------------------
and warrants to Nextel that:

          (a)  Corporate Status; Qualification. Castle has been duly 
               -------------------------------
incorporated and is validly existing as a corporation in good standing under the
laws of Delaware.

          (b)  Authority; Binding Obligation; Authorized. Castle has all 
               -----------------------------------------
necessary corporate power and authority to enter into this Agreement and to 
perform the obligations to be performed by it hereunder. This Agreement 
constitutes a valid and legally binding obligation of Castle and is enforceable 
against Castle in accordance with its terms, and this Agreement and the 
consummation hereof have been duly authorized and approved by Castle by all 
requisite corporate action.

          (c)  No Breach. The execution, delivery, and performance of this 
               ---------
Agreement by Castle will not (i) conflict with any provision of the Certificate 
of Incorporation or By-Laws of Castle; (ii) violate, conflict with, or result in
the breach of any of the terms of, result in a material modification of the 
effect of, otherwise give any other contracting party the right to terminate, or
constitute (or with notice or lapse of time or both constitute) a default under,
any material contract or other agreement to which Castle is a party or by or to 
which it or any of its assets or properties may be bound or subject; or (iii) 
Conflict with or violate any provision of any law, rule, regulation, order, 
writ, judgment, injunction, decree, determination, or award having applicability
to Castle.
          
          (d)  Towers. Each tower and other improvements on a Site constructed 
               ------
by Castle has been or will be built in accordance with the plans and 
specifications therefor, and in material compliance with all applicable 
governmental rules, regulations and Final Approvals have been or will have been 
obtained by Castle as to all Sites constructed by Castle.

     Section 4.5    DISPUTE RESOLUTION.
                    ------------------

          (a)  Prior to commencing arbitration under subsection (b) of this 
Section 4.5, for a dispute arising under this Agreement, the dispute between the
parties shall be submitted for discussion and possible resolution during a 
15-day period commencing with the date that either party gives written notice to
the other that it is invoking the provisions of this Section 4.5(a). The dispute
shall be submitted to the General Counsel or Chief Legal Officer of NCI and the 
President of Castle (or any other member of the senior management of Castle 
designated by the President of Castle). Any person designated to replace any 
named officer shall have the authority to resolve the dispute that has been 
submitted to the provisions of this Section 4.5(a).

14
<PAGE>
 
          (b)  Any controversy, dispute or claim arising out of the
interpretation, performance or breach of this Agreement which is not resolved
under subsection (a) of this Section 4.5, shall be resolved by binding
arbitration, at the request of either party, in accordance with the rules of the
American Arbitration Association. The arbitration shall be conducted by a panel
of three arbitrators, one selected by NCI, one by Castle and the third by the
first two so selected. The arbitration shall be held in Denver, Colorado or such
other location as shall be mutually agreeable to the NCI and Castle. The
arbitration panel shall, upon the concurrence of at least a majority of its
members, have the authority to render an appropriate decision or award,
including the power to grant all legal and equitable remedies and award
compensatory damages provided by the law in the State of Texas and consistent
with the terms of this Agreement but shall have no power to award punitive
damages. The arbitrators shall prepare in writing and provide to the parties an
award including factual findings and the reasons on which the decision is based.
The decision of the arbitrators shall be final and unreviewable of error of law
or legal reasoning of any kind any may be enforced in any court having
jurisdiction of the parties. The parties shall (unless the arbitration panel's
award provides otherwise) each bear one-half of the cost of the arbitration
proceeding (including the fees and expenses of the arbitrators) and all of their
own (and their advisor's) expenses of participation in the arbitration.

     Section 4.6  NOTICES.  Any notice, communication, request, reply or advise 
                  -------   
(hereinafter severally and collectively called "Notice") in this Agreement 
provided or permitted to be given, made or accepted by NCI, Nextel or Castle to 
the other party, must be in writing and may, unless otherwise expressly 
provided herein, be given or be served by depositing the same in the United 
States mail, postpaid and addressed to the other party to be notified, by 
registered or certified mail, return receipt requested, or by delivering the 
same in person to such addressee.  Notice in the manner herein described shall 
be effective, unless otherwise stated in this Agreement, from and after the 
receipt of such Notice by the addressee. Notice given in any other manner 
(including, but not limited to, Notice by courier or Federal Express or the 
like) shall be effective only if and when received by the party notified.  In 
the event addressee refuses delivery of any such Notice, then Notice will be 
deemed to have been received on the date of such refusal.

Notices to NCI or Nextel shall be addressed as follows:

                    Nextel Communications, Inc.
                    1505 Farm Credit Drive
                    Suite 100
                    McLean, Virginia 22102
                    Attn:  Richard Byrne
                    Telecopier No: (703) 394-3417

                    with a copy to:

                    Nextel Communications, Inc.
                    1505 Farm Credit Drive
                    Suite 100
                    McLean, Virginia 22102   
                    Attn: Legal Department - Corporate Counsel - Commercial
                    Telecopier No: (703) 394-3763
   

15
<PAGE>
 
Notices to Castle shall be addressed as follows:

                         Castle Tower Corporation
                         510 Bering, Suite 310
                         Houston, Texas 77057
                         Attn: Mr Ted B. Miller, Jr. and Mr. Jimmy R. Taylor
                         Telecopier No: (713) 974-1926

                         with a copy to:

16


<PAGE>
 
                         Singleton & Cooksey
                         1600 Smith, Suite 4500
                         Houston, Texas 77002
                         Attn: Mr. Taylor V. Cooksey
                         Telecopier No.: (713)651-0251

Either NCI or Castle shall have the right from time to time to change their 
respective address for Notices by providing the other party with 30 days prior 
written Notice in the manner set forth above.

     Section 4.7   INSURANCE.  With respect to each Site acquired by Castle 
                   --------- 
hereunder (whether an Existing Tower Site, Accepted Project or Purchased Site), 
Castle shall procure and maintain, until such date as the applicable Nextel 
Lease expires or terminates, the following insurance: (i) commercial property 
insurance (in an amount equal to the replacement value of the Tower Assets, 
provided that such coverage may be maintained under a blanket policy of 
insurance), Workers Compensation (statutory limits) and contractual liability. 
Such insurance shall insure, on an occurrence basis, against all liability of 
Castle, its employees, agents and contractors arising out of or in connection 
with Castle's construction, use, occupancy and maintenance of the Site.

     Section 4.8   Intentionally Omitted

     Section 4.9.  CONSTRUCTION OF AGREEMENT.  This Agreement shall be governed 
                   -------------------------
by and construed in accordance with the laws of the State of Texas. This 
Agreement embodies the entire agreement and understanding between NCI and other 
Nextel entities and Castle with respect to the subject matter hereof, and 
supersedes all prior and contemporaneous agreements and understandings between 
NCI and Castle, oral or written, relative to the subject matter of this 
Agreement, including, without limitation, the Letter Agreement, but only to the 
extent the Letter Agreement covers the subject matter of this Agreement (the 
parties acknowledging that the Letter Agreement contemplates the execution of 
certain other definitive agreements as well).

     Section 4.10  WAIVERS; MODIFICATIONS.  No waiver or modification of any 
                   ----------------------
provisions of this Agreement shall be effective against either party hereto 
unless it is set forth in a writing signed by both parties. No waiver of any 
breach of any provision of this Agreement shall be deemed a waiver of any other 
breach of the same provision or of any other provision hereof, unless expressly 
so stated in the writing setting forth such waiver.

     Section 4.11  SUCCESSORS AND ASSIGNS.  This Agreement shall be binding upon
                   ----------------------
and inure to the benefit of the parties hereto and their respective successors 
and assigns. No party hereto may make any assignment of this Agreement or any of
its rights or interests herein without the prior written consent of the other; 
provided, however, that each of Castle and NCI may (i) assign this Agreement or 
any of its rights or interests hereunder to any controlled Affiliate, or, (ii) 
collaterally assign, mortgage, pledge, hypothecate or otherwise collaterally 
transfer without consent its interest in this Agreement to any financing entity 
or agent on behalf of any financing entity, to whom NCI or any Affiliate (a) has
obligations for borrowed money or in respect of guaranties thereof, (b) has 
obligations evidenced by bonds, debentures, notes or similar instruments, or (c)
has obligations under or with respect to letters of credit, bankers acceptances 
and similar facilities or in respect of guaranties thereof. Anything in this 
Section to the contrary notwithstanding, no assignment, delegation or pledge of 
this Agreement or any rights or interests hereunder shall relieve the assignor 
of any liability or obligation hereunder. The parties hereby agree that no 
Person not a party to this Agreement shall have any rights or be entitled to any
benefits under this Agreement except Nextel.

     Section 4.12  INTERPRETATION.  The headings in this Agreement are for 
                   --------------
reference only and shall not affect the interpretation of this Agreement. 
Whenever the context requires, words used in the singular shall be construed to 
include the plural and vice versa, and pronouns of any gender shall be

     17
<PAGE>
 
deemed to include and designate the masculine, feminine or neuter gender. Unless
otherwise stated, references to Sections, Exhibits or Schedules refer to the 
Sections of and Exhibits or Schedules to this Agreement.

     Section 4.13  COUNTERPARTS. This Agreement may be executed in multiple 
                   ------------
counterparts, each of which shall be deemed an original, but all of which taken 
together shall constitute one and the same instrument.

     Section 4.14  CONFIDENTIALITY. Except as otherwise required by law, NCI 
                   ---------------
and Castle shall keep confidential the specific terms and provisions of this
Agreement and Castle shall keep confidential the information provided by Nextel
pursuant to Section 2.1. All press releases or other public communications of
any nature whatsoever relating to the transactions contemplated by this
Agreement, and the method of the release for publication thereof, shall be
subject to the mutual prior approval of NCI and Castle, which approval shall not
be unreasonably withheld. In the event either party is required by law to
disclose any term of this Agreement, it shall notify the other party and the
parties shall cooperate and obtain (to the extent practicable) confidential
treatment for the matters disclosed.

     Section 4.15  REMEDIES. Each party's obligation under this Agreement is 
                   --------
unique. If either party should fail to perform its respective obligations under 
this Agreement, the parties acknowledge that it would not be possible to measure
adequately the resulting damages, accordingly, the other party, in addition to 
any other available rights or remedies, shall be entitled to specific 
performance of its rights under this Agreement, and the parties expressly waive 
the defense that damages will be adequate.

     Section 4.16  ATTORNEYS' FEES. The prevailing party in any legal or 
                   ---------------
equitable action shall be entitled to recover its attorneys fees and expenses 
in addition to any other damages or other remedy.

     Section 4.17  SURVIVAL. This Agreement shall survive the Closing as to any 
                   --------
given Site but shall terminate and be of no further force and effect as set 
forth in Section 4.2.

     Section 4.18  BROKERS. Each party represents and warrants to the other that
                   -------
no brokers or finders have been engaged by it in connection with any of the 
transactions contemplated by this Agreement, or, to its knowledge is in any way 
connected with any such transactions. In the event of any claim for broker's or 
finder's fees or commissions in connection with the negotiation, execution or 
consummation of this Agreement, then each party shall indemnify, hold harmless 
and defend the other party from and against any such claim based upon any 
statement or representation or agreement made by or allegedly made by the 
indemnifying party.

18

<PAGE>
 
     IN WITNESS WHEREOF, the parties have caused this Agreement to be duly 
executed as of the date first above written.

                                             NEXTEL COMMUNICATIONS, INC.


                                             By:  /s/ John H. Willmoth
                                                 -----------------------
                                             Name:  John H. Willmoth
                                                   ---------------------
                                             Title: Vice President
                                                   ---------------------

                                             CASTLE TOWER CORPORATION


                                             By:  /s/ John Gwyn
                                                 -----------------------
                                             Name:  John Gwyn
                                                   ---------------------
                                             Title: Senior Vice President-
                                                   -----------------------
                                                    Operations
                                                   -----------------------

19

<PAGE>
 
                           EXHIBIT AND SCHEDULE LIST


Exhibit "A" - Form of Purchase Agreement

Exhibit "B" - Form of Nextel Lease

Exhibit "C" - Form of Guaranty

SCHEDULE "1" - EXISTING TOWER SITES; PURCHASE PRICES

SCHEDULE "2-A" - NEXTEL LEASE RATE SCHEDULE - EXISTING TOWER SITES
SCHEDULE "2-B" - NEXTEL LEASE RATE SCHEDULE - PURCHASED SITES

SCHEDULE "3" - TERRITORY

SCHEDULE "4" - INFORMATION TO BE INCLUDED IN INITIAL NOTICE

SCHEDULE "5" - CONSTRUCTION SCHEDULE

SCHEDULE "6" - ADDITIONAL CONSTRUCTION SERVICES

SCHEDULE "7" - PURCHASED AND EXCLUDED ASSETS

SCHEDULE "8" - PREEXISTING CONTRACTS; CURRENTLY PERMITTED SITES

20

<PAGE>
 
                                  SCHEDULE 2


A. Monthly rate for existing digital Towers PURCHASED by Castle
     Number of Antennas (Lines)                   Monthly Rate (see Notes below)
             5 or less                                        [*]
             6-8                                              [*]
             9-11                                             [*]
             12                                               [*]


B. Monthly Rates for new Towers BUILT or PURCHASED by Castle
     Number of Antennas (Lines)                   Monthly Rate (see Notes Below)
             5 or less                                        [*]
             6-8                                              [*]
             9-11                                             [*]
             12                                               [*]


Notes
- -----

1.   The specified monthly tower rate shall be increased by (a) [*] in the event
Licensee requires the use of Castle's equipment shelter; and (b) [*] if Licensee
requires the use of Castle's generator (minimum 35KW for exclusive use).

2.   Upon the installation of any microwave antenna(s) the specified monthly 
tower rate shall be increased at a rate of (a) [*] per linear foot per microwave
antenna, using standard microwave cabling, plus (b) (i) [*] for antenna dishes
two (2) feet in diameter; (ii) [*] for antenna dishes four (4) feet in diameter;
(iii) [*] for antenna dishes six (6) feet in diameter; and (ii) [*] for antenna
dishes eight (8) feet in diameter.

 .  Heights above 250 feet are subject to review and evaluation by Castle.
 .  All grid dishes must contain de-icers.
 .  All dishes larger than 2' must contain radone cover

3.   The specified monthly tower rates shall be fixed for the first five years; 
thereafter, the rent is subject to annual escalation at the rate of [*]. 
Additionally, with respect to Existing Tower Sites that are designated as 
"Digital" Sites on SCHEDULE 1, Nextel is entitled to a reduction in it's rent 
payment equal to [*].

21

[*] Indicates where text has been omitted pursuant to a request for confidential
treatement. The omitted text has been filed with the Securities and Exchange 
Commission separately.
<PAGE>
 
                                  SCHEDULE 4

                            FORM OF INITIAL NOTICE

 .    Site Name

 .    Site Number

 .    Corridor

 .    Site City, County and State

 .    Site Map (Important Information)

 .    Site Latitude and Longitude

 .    Photographs (Minimum 6)

 .    Executed Ground Lease/License including pertinent lease documents

          .        Easement or contractual right of access and any utility right
               of way if not included in lease

          .        Exhibit showing preliminary plan for Nextel use of site (to 
               be finalized in Completion Notice).

 .    Preliminary Zoning and Permitting Analysis

 .    Telephone and Electrical Service Provider

 .    Tile Report

 .    Phase I

 .    Geotechnical Report

 .    Registered Site Survey (within 6 months)

 .    General information on Tower proposed

          .        Type (self support, monopole, guy....)

          .        AGL

          .        Capacity

22

<PAGE>
 
Date of Initial Notice:____________________________

Notice Complete?  Yes ___     No___ (if No, circle missing data)

Accepted ______

Purchase ______

Waive _________

                              CASTLE TOWER CORPORATION

                              By:_____________________
                              Name:
                              Title:

                              Date:___________________

23
          
<PAGE>
 
                                  Schedule 5

                             Construction Schedule
                             ---------------------

(Day 1:   Delivery of Completion Notice)

Day 15:   Tower Foundation Initiated

Day 30:   Tower Installed

Day 60:   Completion

24 
<PAGE>
 
SCHEDULE 6 - ADDITIONAL CONSTRUCTION SERVICES             
                                                               
The following pricing is based upon Castle (or Crown) building the entire site
and installing a NEXTEL supplied 10'x 20' equipment building, three antennas
with three runs of coaxial, along with associated hardware and three GPS
antennas. NEXTEL will supply all antennas, coaxial and materials. Crown will
supply the side arms for the tower. For each additional antenna and coaxial
cable installed over three, there will be a [*] fee added which will include the
cost of labor and side arms (i.e. if there are six total antennas installed, the
antenna installation pricing will be [*]. In addition, Nextel and Castle (or
Crown) will determine on a site by site basis which services set forth below
will be required. In the event that certain services are not required or
supplied by Castle (or Crown), then the fee charged will be adjusted in
accordance with the below listed schedule.

A.   COST BREAKOUT FOR EACH PHASE FOR NEXTEL WILL BE AS FOLLOWS:      
     -----------------------------------------------------------       
                                                                          
     Cost breakout:                                                  
                                                                     
     1.   Electric and Telco Service                       [*]
     2.   Building Foundation with Door Pad                [*]
     3.   Grounding                                        [*]
     4.   Ice Bridge                                       [*]
     5.   Crane and Spreaders for Building                 [*]
     6.   Project Management                               [*]
     7.   As-Build Documentation                           [*]
     8.   Antenna Installation including Materials,        [*]
     9.   Inventory and Delivery                           [*]
               For each additional antenna and coaxial installed over three,
        there will be a [*] labor fee added, (i.e. if there are six total
        antennas installed, the antenna installation pricing will be [*]).

B.   PROJECT MANAGEMENT AND COORDINATION:  
     -----------------------------------   
                                                                          
     Castle (or Crown) will perform the following:
                                                                          
     1.   Coordinate all engineering layouts and site selection.     
     2.   Document all final site locations; obtain NEXTEL/Castle (or Crown)
     approvals.
     3.   Document all locations by site, by material.               
     4.   Obtain all electrical approvals and permits for each installation.
     5.   Coordinate lease execution, site by site.                  
     6.   Coordinate and order all materials by site, including types of        
     antennas, length of coaxial, and electrical installation.
     7.   Inventory all material by site, by type.               
     8.   Schedule all installations.                            
     9.   Coordinate all acceptance testing by NEXTEL.           
     10.  Submit Weekly Project Reports by site, by work type, etc. For example:
          a.   Permitting         
          b.   Construction       
          c.   Antenna Installation 
          d.   Acceptance          
          e.   Documentation       
     11.  Submit any project updates as required by NEXTEL management.
     12.  Provide as-built documentation by site upon completion of the project.
     
25    

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
C.   SCOPE OF WORK TO INCLUDE BUT NOT LIMITED TO:
     -------------------------------------------

     The following is a list of work activities to be performed by Castle (or 
     Crown) under their exclusive direction.

          .              Install and ground coax all NEXTEL antennas with the
               appropriate Andrew hangers. Prepare and install coax jumpers
               between antennas and NEXTEL lines.
          .              Ground all lines at the top of the tower, at the base 
               of the tower, and at the entrance of the building.
          .              Furnish and install 10' of ice bridge between tower and
               equipment building.
          .              All connectors, coax, hangers, grounding kits and 
               hoisting grips will be provided by NEXTEL.
          .              Sweep test all antenna lines after installation. A
               graph print-out is to be provided to the local NEXTEL maintenance
               engineer for approval.
          .              Installation of prefabricated equipment shelter for
               NEXTEL. Coordination of delivery and off-loading of NEXTEL's
               shelter is the responsibility of Castle (or Crown); Crane,
               rigging and spreaders bars are to be provided for by Castle (or
               Crown).
          .              Furnish and install NEXTEL building foundation, per
               equipment shelter manufacturer's specifications along with a pad
               outside door.
          .              Furnish and install three #3/0 RHW copper cable in 4"
               PVC conduit buried 24" below finished grade to provide
               underground single-phase, 100 ampere, 120/240 VAC electrical
               service from meter cabinet to telephone pole. Meter cabinet and
               100 ampere fused disconnect shall be furnished and installed in
               accordance to local power company requirements and the NEC. The
               meter cabinet will be located inside the fenced area and will not
               be greater than 20' from building, in a location which provides
               visibility of meter from outside of fenced area, as well as
               inside.
          .              Furnish and install 4" PVC and 24" below finished grade
               from power pole to equipment shelter. Provide pull cable in
               conduit. Stub up and cap 12" above grade at the meter cabinet.
               Run conduit into building through existing sleeve and seal
               penetration. Seal both ends water tight after telephone cable is
               installed.
          .              Furnish and install exterior grounding around shelter,
               guy anchors (if applicable) and lower in accordance with NEXTEL'S
               ground specifications.
          .              Test and provide results of test which verify ground 
               resistance of less than 5 ohms.

26

<PAGE>
 
SCHEDULE 7     PURCHASED AND EXCLUDED ASSETS
               -----------------------------


     SALE OF TOWER WITHOUT SHELTER
     ---------------------------------------------------------------------------

     INCLUDED (IF EXISTING)
     ----------------------
     .    Seller's interest in the ground leases and tenant license and lease 
          agreements
     .    Seller's interest in all access easements and rights of ingress and
          egress to the property, and all rights to easements and / or licenses
          which authorize the placement of guy wires, anchors and utilities.
     .    Tower Structure
     .    Tower Foundation
     .    Guy Wires and Anchors (if applicable)
     .    Cable ladder on tower
     .    Tower Lights and electrical connections thereto
     .    Tower Light Controller and Tower light alarm system, (subject to them
          being removed from shelter)
     .    Tower Grounding System
     .    Perimeter fencing, gates, attachments thereto
     .    Any site lighting not attached to equipment shelter
     .    Access Road (to the extent owned by Nextel)
     .    Rights to any contracts, warranties, or guarantees relating to
          management, ownership, operation and maintenance of the transferred
          items, (to the extent transferable)
     .    Telephone and electrical utility poles, transformers and lines (to 
          drop point at shelter)
     .    Utility Capacity
     .    All intangible rights and properties owned by Seller, to the extent
          arising under or forming a part of the leasehold or fee interest
          included within the Assets and being sold, assigned or transferred to
          Buyer
     .    All other rights, privileges and appurtenances owned by Seller,
          reversionary or otherwise, relating to the leased or owned real estate
          included within or comprising a part of the Assets and being sold,
          assigned or transferred to Buyer, but only to the extent (i) used or
          available for use by Seller in connection with Seller's ownership or
          operation of such Assets and (ii) not listed within the Excluded items
          enumerated below.
     .    To the extent existing, all site plans, surveys, plans and
          specifications, geotechnical studies, engineering plans and studies,
          environmental reports, and other plans or studies, provided that
          Seller may retain copies of any or all of such items


     EXCLUDED
     --------
     .    Generator, fuel tank, concrete pad and electrical conduit
     .    Shelter and all equipment therein with possible exception of tower 
          light controller
     .    Shelter foundation
     .    Antennas and mounts including platform if applicable
     .    Coaxial cables including mounting and grounding hardware
     .    Waveguide bridge
     .    Any external or "cabinetized" installation of Nextel electronics
     .    Any other of Seller's Communication Equipment (as defined in the Site 
          Commitment Agreement) located at the Site
     ---------------------------------------------------------------------------

27

<PAGE>
 
     SALE OF SHELTER
     ---------------------------------------------------------------------------


     INCLUDED (IF EXISTING)
     ----------------------
     .    Equipment shelter (shell)
     .    Shelter foundation
     .    Overhead lighting and all AC electrical outlets
     .    Interior halo ground
     .    HVAC system
     .    Waveguide bridge
     .    Tower light controller
     .    AC Surge arrestor
     .    TI Surge Arrestor
     .    Electrical circuit breaker panel(s)
     .    Fire suppression system
     .    POTS line
     .    Exterior lighting attached to shelter
     .    Security System
     .    Cable Ladder Rack (if practical)
     .    Electrical conduit
     .    All other items listed above as "Included" in Sale of Tower without 
          Shelter


     EXCLUDED
     --------
     .    DC power plant (including rectifiers, inverters and batteries)
     .    Equipment racks and components installed therein
     .    All wiring from DC power plant to equipment racks (and within 
          equipment racks)
     .    All wiring between equipment racks (including MDF connections)
     .    Coax jumpers and connectors
     .    Generator, fuel tank, electrical conduit and concrete pad
     .    Generator transfer switch
     .    Interconnect equipment (CSU, etc.)
     .    Coax surge suppression system
     .    Any other of Seller's Communication Equipment (as defined in the Site 
          Commitment Agreement) located at the Site
     .    All other items listed above as "Excluded" in Sale of Tower without 
          Shelter
     ---------------------------------------------------------------------------

28

<PAGE>
 
SCHEDULE 8    PREEXISTING CONTRACTS; CURRENTLY PERMITTED SITES
              ------------------------------------------------

          PREEXISTING CONTRACTS: SITES COMMITTED TO OTHER PARTIES
          -------------------------------------------------------

<TABLE> 
<CAPTION> 
          --------------------------------------------------------------
                                                               BUILD
          NAME                LATITUDE        LONGITUDE        MARKET         
          ----                --------        ---------        ------    
          <S>                 <C>             <C>              <C> 
          Prairic Dell        30-49-34        97-35-20         Texas      
          --------------------------------------------------------------
          Bruceville          31-18-45        97-15-28         Texas      
          --------------------------------------------------------------
          Selinsky            29-38-15        95-19-30         Texas        
          --------------------------------------------------------------
          Hamshire            29-51-30        94-20-55         Texas        
          --------------------------------------------------------------
          Mustang             29-30-16        95-24-48         Texas      
          --------------------------------------------------------------
          Grandview           32-15-15        97-09-58         Texas       
          --------------------------------------------------------------
          Italy               32-11-51        96-54-03         Texas       
          --------------------------------------------------------------
          Carl's Corner       32-02-41        97-03-39         Texas       
          --------------------------------------------------------------
          Lebanon             36-12-01        86-21-26         Nashville
          --------------------------------------------------------------
          Arlington           35-21-11        89-38-00         Memphis
          --------------------------------------------------------------
          Stanton             35-25-46        89-22-57         Memphis
          --------------------------------------------------------------
          Brownsville         35-33-46        89-08-06         Memphis
          --------------------------------------------------------------
</TABLE> 
         
29

<PAGE>
 
                                                                   EXHIBIT 10.11

                       INDEPENDENT CONTRACTOR AGREEMENT

- --------------------------------------------------------------------------------
              WITH CONFIDENTIALITY AND NON-COMPETITION AGREEMENTS

THIS AGREEMENT is entered into as of this 8th day of July 1996 between Crown
Network Systems, Inc. a Pennsylvania corporation (the "Contractor"), with an
office at Penn Center West III, Suite 229, Pittsburgh, Pennsylvania 15276, and
Sprint Spectrum L. P., a Delaware limited partnership ("Sprint Spectrum"), with
an office at Penn Center West II, Suite 200, Pittsburgh, Pennsylvania 15276.

WHEREAS, the Contractor has been approved to perform construction services for
Sprint Spectrum on selected communications sites (each of which is referred to
herein as a "Site") for Sprint Spectrum's Personal Communications System ("PCS')
in the Pittsburgh Metropolitan Trading Area.

In consideration of the mutual covenants and promises set forth herein, the
parties hereto, intending to be legally bound hereby, agree as follows:

1.   The Contractor shall perform all the work set forth in the Scope of Work
     (the "Work"), pursuant to the specifications and terms and conditions set
     forth therein or which may reasonably be implied therefrom. All of the
     services set forth in Exhibit "B" attached hereto and all materials,
     supplies, services, equipment, technical specifications and other items set
     forth in the Notice to Proceed (as defined in Paragraph 3 hereof), are
     included in the Work. Technical specifications and a Construction Services
     Fee will be negotiated independently for each selected Site and
     incorporated into the Notice to Proceed. The Construction Services Fee will
     be "Firm Fixed Price" for the services described in the Construction
     Services section of Exhibit B and those services set forth in the Notice to
     Proceed (the "Construction Services Fee").

2.   Following the full execution of a Site Lease Acknowledgment ("SLA"), the
     Contractor shall send its invoice to Sprint Spectrum requesting payment of
     a Lump Sum Price for such Site. Payment of the Lump Sum Price by Sprint
     Spectrum shall be due within thirty (30) days from receipt of the
     Contractor's invoice. The Lump Sum Price for each selected Site shall be
     comprised of a Construction Management Fee of [*], and a Warehousing and
     Material Handling Fee of [*] for the services described in the Construction
     Management and Warehousing and Material Handling sections of Exhibit B (the
     "Lump Sum Price").

3.   The Contractor shall prepare and deliver to Sprint Spectrum, together with
     a signed SLA, a "Firm Fixed Price" proposal, a bill of materials, a
     description of the Work and technical specifications. Upon agreement to the
     price and terms of the foregoing, Sprint Spectrum shall issue to the
     Contractor a written notice confirming the price and terms agreed upon and
     fixing the date on which the Contractor shall commence

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT 
PAGE 2 OF 15

- --------------------------------------------------------------------------------

     performance of its obligations under this Agreement (the "Notice to
     Proceed"). The Contractor shall commence the Work, pursuant to this
     Agreement, on each Site promptly upon the commencement date set forth in
     the Notice to Proceed and shall prosecute the Work on each Site diligently
     to completion. The Contractor will complete the Work required pursuant to
     the Notice to Proceed within thirty (30) calendar days of the commencement
     date set forth in the Notice to Proceed; provided, however, that the
     Contractor shall not be obligated to complete more than 16 Sites in any
     thirty (30) calendar day period. If more than 16 Notices to Proceed are
     concurrently outstanding, the Contractor will have an additional three (3)
     days to complete each Site above the 16 Site minimum. For example, if 17
     Notices to Proceed are outstanding, the last Site will be completed within
     thirty-three (33) calendar days of the commencement date set forth in its
     Notice to Proceed. If 18 Notices to Proceed are outstanding, the first 16
     must be completed within thirty (30) days, the 17th within thirty-three
     (33) days of the commencement date set forth in its Notice to Proceed and
     the 18th within thirty-six (36) days of the commencement date set forth in
     its Notice to Proceed. Once the outstanding Notices to Proceed are below
     16, the thirty day completion requirement will resume for any Notices to
     Proceed thereafter issued. The Contractor shall not perform any of the Work
     or make any financial commitments until receiving the Notice to Proceed.
     The performance of any portion of the Work or preparation to perform any of
     the Work by the Contractor, prior to receiving the Notice to Proceed, is
     done at the Contractor's own risk.

4.   Upon final completion of the entire Work at each Site by the Contractor in
     accordance with the provisions of this Agreement, the Contractor shall
     request, in writing, final inspection of the Work. Sprint Spectrum will
     inspect the Work within five (5) calendar days of the Contractor's written
     request. Within five (5) calendar days of the inspection, Sprint Spectrum
     will either provide a signed writing evidencing final acceptance of the
     Work, or, through the use of a punch list form, advise the Contractor of
     the portions of the Work that are defective or incomplete or of obligations
     that have not been fulfilled but are required for final acceptance. The
     Contractor shall complete any unfinished or defective portion of the Work
     which is necessary to install and operate Sprint Spectrum's equipment
     within five (5) working days following issuance of the punch list. In no
     event shall completion by the Contractor of all unfinished or defective
     portions of the Work exceed thirty (30) calendar days following issuance of
     the punch list. After final acceptance of the Work, Sprint Spectrum shall
     pay the Contractor the Construction Services Fee identified in the Work
     within forty-five (45) days from the date of receipt of the Contractor's
     invoice. Acceptance by the Contractor of payment shall release Sprint
     Spectrum from all claims and all liability to the Contractor for all things
     done or furnished in connection with the Work and from all acts or
     omissions of Sprint
<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT
PAGE 3 OF 15

- --------------------------------------------------------------------------------

     Spectrum relating to or arising out of the Work. No payment, however, shall
     operate to release the Contractor from its obligations under this
     Agreement.

5.   Sprint Spectrum will, from time to time, provide the Contractor with a list
     of materials and equipment which Sprint Spectrum will supply (the "List").
     The Contractor will use the materials and equipment supplied by Sprint
     Spectrum and will not substitute any of the same without Sprint Spectrum's
     prior written consent. Materials and equipment supplied by Sprint Spectrum
     shall be inspected, approved and accepted by the Contractor and become part
     of the Work of this Agreement. If materials or equipment are required which
     are not on the List, the Contractor may supply such materials or equipment
     itself or obtain them from independent parties. If the Contractor supplies
     any materials, equipment or labor it shall be based on the Contractor's
     published rates as set forth on Exhibit "C" attached hereto. The Contractor
     shall identify the cost being billed to Sprint Spectrum for any materials,
     equipment or labor which it desires to obtain from an independent party and
     shall identify the manufacturer of such materials as are obtained from an
     independent party in its proposal for the Construction Services Fee. Upon
     request, the Contractor shall submit an itemized account and supporting
     data which substantiates all costs and expenses associated with materials,
     equipment or labor procured from independent parties.

6.   Notwithstanding any other provision contained in the Work or any other
     document exchanged by the parties, the following terms and conditions shall
     apply with respect to this Agreement and the materials, equipment and
     services provided hereunder:

     a)   The Contractor, its agents, subcontractors, and employees shall
          perform the Work as independent contractors, and not as agents,
          partners, joint venturers or employees of Sprint Spectrum. The
          Contractor shall supervise and direct the Work, using the care and
          skill ordinarily used by members of the Contractor's profession
          practicing under similar conditions at the same time and in the same
          geographic area, and the Contractor shall be solely responsible for
          all construction means, methods, techniques, sequences and procedures
          and for coordinating all portions of the Work.

     b)   Unless otherwise specifically provided in the Work, the Contractor
          shall provide and pay for all labor, supervision, materials,
          construction surveys and layout, equipment, tools, construction
          equipment and machinery, water, heat, utilities, transportation, and
          other facilities and services necessary for the proper execution and
          completion of the Work, whether temporary or permanent, and whether or
          not incorporated or to be incorporated in the Work
<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT
PAGE 4 OF 15

- --------------------------------------------------------------------------------

          and any other items incidental to the execution of the Work, all as
          indicated or which may reasonably be implied from the Work.

     c)   The Contractor shall at all times enforce strict discipline and good
          order among its employees and shall not employ on the Work any unfit
          person or anyone not skilled in the task assigned to such person.

     d)   The Contractor hereby represents and warrants to Sprint Spectrum that
          all materials and equipment incorporated in the Work will be new
          unless otherwise requested in writing by the Contractor and agreed to
          in writing by Sprint Spectrum prior to their use. All such materials
          and equipment shall be subject to inspection and approval by Sprint
          Spectrum. The Contractor further represents and warrants that the Work
          to be performed under this Agreement, and all workmanship, materials
          and equipment provided, furnished, used or installed in construction
          of the same, shall be safe, substantial and durable construction in
          all respects, and that all of the Work will be free from faults and
          defects and in conformance with the terms of the Work. All of the
          Work, including all materials and equipment, not conforming to these
          requirements may be considered defective by Sprint Spectrum. This
          warranty for each Site shall be for a period of twelve (12) months
          from the date of final acceptance of the Work on each Site by Sprint
          Spectrum (the "Warranty Period"). Nothing herein shall limit Sprint
          Spectrum's right to seek recovery for latent defects which are not
          observable until after the Warranty Period has expired. The warranty
          provided herein shall be in addition to and not in limitation of any
          other warranty or remedy required by law or this Agreement. The
          Contractor will be responsible to make sure that all third-party
          warranties flow through to Sprint Spectrum and will enforce all such
          warranties for the benefit of Sprint Spectrum.

          The Contractor agrees to correct any defective portion of the Work,
          including all materials and equipment upon request and to the
          reasonable satisfaction of Sprint Spectrum during the Warranty Period;
          provided, however, that materials supplied by Sprint Spectrum which
          are installed and tested by the Contractor and accepted by Sprint
          Spectrum and are thereafter found to be defective shall be replaced by
          the Contractor at the expense of Sprint Spectrum in accordance with
          the Contractor's published rates as set forth on Exhibit C. If the
          Contractor fails, after three (3) business days following notice from
          Sprint Spectrum: (i) to commence and continue correction of such
          defective Work with diligence and promptness; (ii) to perform the
          Work; or (iii) to comply with any other provision of this Agreement,
          Sprint Spectrum may correct and remedy any such deficiency. In
          connection with such corrective
<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT 
PAGE 5 OF 15

- --------------------------------------------------------------------------------

          and remedial action, Sprint Spectrum may exclude the Contractor from
          all or part of the Site, take possession of all or part of the Work,
          and suspend the Contractor's services related thereto, take possession
          of and incorporate in the Work all materials and equipment paid for by
          Sprint Spectrum which either are stored at the Site or are stored
          elsewhere. The Contractor shall allow Sprint Spectrum, its agents,
          representatives and employees, access to the Site to enable Sprint
          Spectrum to exercise the rights and remedies as stated hereunder. All
          claims, costs, losses and damages incurred or sustained by Sprint
          Spectrum in exercising such rights and remedies will be charged
          against the Contractor and may be deducted from monies due or to
          become due to the Contractor; and Sprint Spectrum shall be entitled to
          an appropriate decrease in the Construction Services Fee or any other
          remedy permitted in this Agreement or allowed by law. Such claims,
          costs, losses and damages will include, but not be limited to, all
          costs of repair or replacement for work of others destroyed or damaged
          by correction, removal or replacement of the Contractor's defective
          work. No extension of the time for completion will be given or
          inferred due to the exercise by Sprint Spectrum of Sprint Spectrum's
          rights and remedies hereunder. The Contractor shall not be responsible
          for reasonable delays caused by inclement weather which typically
          delays a reasonable contractor's performance of work substantially
          similar to the Work set forth herein.

     e)   The Contractor shall give all notices and comply with all laws,
          ordinances, rules, regulations, and lawful orders of any public
          authority bearing on the performance of the Work (hereinafter "Laws
          and Regulations"), and shall promptly notify Sprint Spectrum if the
          terms of the Work are at variance therewith.

          Unless otherwise set forth herein, the Contractor shall obtain at its
          expense, all necessary local and municipal permits, licenses,
          inspections, certificates and approvals of the Work and shall ensure
          compliance with all state environmental laws and shall furnish
          utilities it may require to perform the Work. Sprint Spectrum shall
          pay all fees for such permits, licenses, inspections, certificates or
          approvals to the appropriate government body or other entity.

          The Contractor shall at all times itself observe and comply with, and
          cause all its agents and employees to observe and comply with, all
          such existing and future Laws and Regulations; and shall protect and
          indemnify Sprint Spectrum, its officers and agents, against any claims
          or liability arising from or based
<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT
PAGE 6 OF 15

- --------------------------------------------------------------------------------

          upon violation of such Laws and Regulations, whether by itself or its
          agents or employees.

     f)   The Contractor shall be responsible to Sprint Spectrum for the acts
          and omissions of its employees, subcontractors and their agents and
          employees, and other persons performing any of the Work under a
          contract with the Contractor.

     g)   The Contractor at all times shall keep the Site free from accumulation
          of waste materials or rubbish caused by its operations. At the
          completion of the Work, the Contractor shall remove all its waste
          materials and rubbish from and about the project as well as its tools,
          construction equipment, machinery and surplus materials. If the
          Contractor fails to clean up as provided pursuant to this Agreement,
          Sprint Spectrum may do so and the reasonable cost thereof shall be
          charged to the Contractor and may be deducted from monies due or to
          become due to the Contractor.

     h)   The Contractor shall protect, maintain and secure the Work during
          construction and until final acceptance of the Work. This protection,
          maintenance and security shall be continuous so that the Work is
          protected, maintained and secured in satisfactory condition at all
          times. All costs of protection, maintenance and security before final
          acceptance of the Work shall be part of the Construction Services Fee.
          Should the Contractor, at any time, fail to so protect, maintain and
          secure the Work, Sprint Spectrum, upon observing such failure, shall
          notify the Contractor of such non-compliance and the Contractor shall
          remedy such unsatisfactory condition within three (3) business days.
          If the Contractor fails to remedy such condition, Sprint Spectrum may
          suspend any of the Contractor's Work at a Site and Sprint Spectrum may
          correct such unsatisfactory condition. Any protection, maintenance or
          security cost incurred by Sprint Spectrum, shall be charged to the
          Contractor and may be deducted from monies due or to become due to the
          Contractor.

     i)   The Contractor shall acquire through assignment, purchase, license, or
          other means, all rights required to fully utilize all technology, 
          know-how, trade secrets, inventions, processes, articles, procedures,
          equipment, apparatus, devices, or any other part thereof, and any and
          all things or matters that are to be used in pursuance of performance
          of the Work under the terms and conditions of this Agreement.

<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT 
PAGE 7 OF 15

- --------------------------------------------------------------------------------

          If a temporary, preliminary or permanent injunction is secured because
          of an alleged patent or proprietary rights infringement, which
          prevents Sprint Spectrum from using the process, materials or
          equipment furnished, utilized or installed, the Contractor, at its
          expense, shall within thirty (30) calendar days following notification
          either: 1) procure the right for Sprint Spectrum to continue using the
          same process, materials or equipment; or 2) modify the process,
          materials or equipment, or provide a replacement process, materials or
          equipment which is non-infringing, and is reasonably satisfactory to
          Sprint Spectrum. The Contractor shall defend all suits or claims for
          infringement of any patent or proprietary rights and shall save Sprint
          Spectrum harmless from loss on account thereof. The obligations of the
          Contractor under this paragraph shall survive the termination or
          expiration of this Agreement.

     j)   Sprint Spectrum reserves the right to conduct, at its expense, any
          test or inspection it may deem advisable to assure that construction,
          supplies and services conform to the provisions of this Agreement,
          including the Work. Two (2) types of testing will be required for
          certain equipment and components covered under this Agreement: Cable
          sweeps; and Megger Tests of five (5) ohms or less. All tests shall be
          witnessed by representatives of Sprint Spectrum. It shall be the
          responsibility of the Contractor to assure that such tests are
          performed and shall submit the written test reports, results and
          certificates to Sprint Spectrum, summarizing the results of all tests
          and indicating satisfactory completion of all required tests. All such
          reports, results and certificates shall be submitted prior to final
          acceptance of the Work. Additional information concerning testing
          requirements may be contained in the Work.

     k)   The Contractor shall take reasonable safety precautions with respect
          to performance of this Agreement, shall comply with all safety
          measures initiated by Sprint Spectrum and all applicable laws,
          ordinances, rules, regulations and orders of public authorities for
          the safety of persons or property. The Contractor shall report to
          Sprint Spectrum within three (3) calendar days any injury to an
          employee or agent of the Contractor which occurred at a Site.

          If hazardous substances of a type for which an employer is required by
          law to notify its employees are being used on a Site by the
          Contractor, its subcontractors or anyone directly or indirectly
          employed by them, the Contractor shall, prior to exposure of any
          employees on a Site to such substance, give written notice of the
          chemical composition thereof to Sprint Spectrum, any subcontractors or
          other employers on such Site, in sufficient
<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT 
PAGE 8 OF 15

- --------------------------------------------------------------------------------

          detail and time to permit compliance with such laws by Sprint
          Spectrum, other subcontractors and other employers on such Site.

          In the event that the Contractor encounters on the Site material
          reasonably believed to be asbestos or polychlorinated biphenyl
          ("PCB"), which has not been rendered harmless, the Contractor shall
          immediately stop Work in the area affected and report the condition to
          Sprint Spectrum in writing. The Work in the affected area shall resume
          in the absence of asbestos or PCB, or when it has been rendered
          harmless.

     l)   The Contractor may be ordered in writing by Sprint Spectrum without
          invalidating this Agreement, to make changes in the Work within the
          general scope of this Agreement consisting of additions, deletions or
          other revisions, the Construction Services Fee and time for completion
          being adjusted accordingly. The Contractor, prior to the commencement
          of such changed or revised portion of the Work, shall submit promptly
          to Sprint Spectrum written copies of a claim for adjustment to the
          Construction Services Fee, and time for completion, for such revised
          Work in a manner consistent with requirements of this Agreement. The
          Contractor may request a change in the Work by providing Sprint
          Spectrum with a written request describing the change. If such change
          is acceptable to Sprint Spectrum, Sprint Spectrum shall provide a
          written change order to the Contractor as set forth above. Sprint
          Spectrum shall have five (5) working days to either provide the
          Contractor with the requested change order or provide written notice
          that the request is denied. If Sprint Spectrum fails to provide such
          notice within the five (5) business day period, the requested change
          order will be deemed to have been accepted by Sprint Spectrum. The
          Contractor shall not perform any change in the Work, including
          additions, deletions or other revisions, without prior written
          authorization from Sprint Spectrum.

     m)   To the fullest extent permitted by law, the Contractor shall defend,
          indemnify and hold harmless Sprint Spectrum and its agents and
          employees from and against all liability, claims, damages, losses and
          expenses of whatever nature, including, but not limited to attorneys'
          fees arising out of or resulting from the performance of the Work,
          provided that any such liability, claim, damage, loss or expense 1) is
          attributable to bodily injury, sickness, disease or death, or to
          injury to or destruction of tangible property including the loss of
          use resulting therefrom, and 2) caused in whole or in part by any
          negligent act or omission or act of willful misconduct of the
          Contractor, any subcontractor, anyone directly or indirectly employed
          by any of them or anyone for whose acts any of them may be liable,
          regardless of whether or not it is caused in part by a
<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT 
PAGE 9 OF 15

- --------------------------------------------------------------------------------

          party indemnified hereunder. Such obligation shall not be construed to
          negate, abridge or otherwise reduce any other right as to any party or
          person described in this paragraph. In any and all claims against
          Sprint Spectrum or any of its agents or employees, by an employee of
          the Contractor, any subcontractor, anyone directly or indirectly
          employed by any of them or anyone for whose acts any of them may be
          liable, the indemnification obligation under this paragraph shall not
          be limited in any way by any limitation on the amount or type of
          damages, compensation or benefits payable by or for the Contractor or
          any subcontractor under workers' or workmen's compensation acts,
          disability liability benefits acts or other employee benefit acts. The
          above obligations shall survive the termination or expiration of this
          Agreement.

     n)   The Contractor shall purchase and maintain insurance for protection
          from claims under Workers' Compensation and other employee benefit
          acts, claims for damages because of bodily injury, including personal
          injury, sickness or disease or death. The Contractor shall also
          purchase and maintain insurance for protection from claims or damages
          to property, including loss of use resulting therefrom, which may
          arise out of or result from the Contractor's operations under this
          Agreement, whether such operations be by the Contractor, its employees
          and agents, or any subcontractor and its agents and employees or
          anyone directly or indirectly employed by any of them. The insurance
          shall be written by companies and with limits and coverage acceptable
          to Sprint Spectrum in accordance with Exhibit A attached. The limits
          specified shall not act to limit the liability of the Contractor or
          the indemnification obligation of the Contractor. The Contractor and
          its subcontractors shall require their insurance carriers, with
          respect to all insurance policies, to waive all rights of subrogation
          against Sprint Spectrum. Certificates of such insurance shall be filed
          with Sprint Spectrum prior to commencement of the Work, with such
          Certificates indicating thirty (30) days notification in writing to
          Sprint Spectrum if material change or cancellation takes place, and
          certificates shall also indicate that Sprint Spectrum L.P. shall be
          named as additional insured as respects the operations of the insured
          in accordance with the Construction Agreement. Copies of the entire
          insurance policies will be provided upon request.

     o)   If the Contractor persistently or repeatedly fails or neglects to
          carry out the Work at a Site in accordance with this Agreement, or
          fails to observe the safety rules and other rules and regulations
          governing performance of the Work at a Site, and fails within five (5)
          business days after receipt of written notice to commence and continue
          correction of such default or neglect with diligence and promptness,
          Sprint Spectrum may, without prejudice to any other
<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT 
PAGE 10 OF 15

- --------------------------------------------------------------------------------

          remedy that Sprint Spectrum may have, terminate the Contractor and
          finish the Contractor's Work at a Site by whatever method Sprint
          Spectrum may deem expedient. If the expense of finishing the
          Contractor's Work at a Site exceeds the value of the Construction
          Services Fee, the Contractor shall pay the difference to Sprint
          Spectrum. The Contractor shall not be responsible for delays caused by
          inclement weather which typically delays a reasonable contractor's
          performance of work substantially similar to the Work set forth
          herein.

          To the extent the Contractor is terminated at a Site, the Contractor
          shall immediately take all steps to protect the subcontracts for
          labor, materials, equipment or services with respect to the
          termination. Sprint Spectrum may then withhold payment to the
          Contractor until after the Work pursuant to this Agreement is
          completed in a satisfactory manner.

     p)   The Contractor understands that Sprint Spectrum may remove the
          Contractor and/or suspend performance of the Work upon request of the
          owner ("Owner") or lessor ("Lessor") of the Site where the Work is to
          be performed if the Owner or Lessor reasonably believes that the
          Contractor is failing to satisfactorily perform the Work.

     q)   The Contractor agrees to be bound by all of the provisions of the
          contract between Sprint Spectrum and the Owner or Lessor insofar as
          they apply to the Work to be performed under this Agreement. The
          Contractor acknowledges receipt of a copy of any such contract prior
          to commencement of the Work.

     r)   The Contractor, for itself and for its subcontractors, materialmen,
          mechanics and all persons under it, hereby waives the right to any
          lien against the ground, structures or any improvements on each Site
          for Work or labor done or materials furnished pursuant to this
          Agreement. If requested by Sprint Spectrum, the Contractor agrees to
          execute a "no-lien" agreement on a form supplied by Sprint Spectrum.

7.   Where the Contractor owns or manages the selected Sites and Sprint Spectrum
     is required to exercise its rights under Paragraphs 6(d), (o) or (p) above,
     the Contractor grants Sprint Spectrum, its employees, contractors,
     subcontractors or agents, the right to enter upon such Sites and to perform
     the necessary work.

8.   Sprint Spectrum intends to protect its proprietary information, together
     with proprietary information of the Owner or Lessor, which may be disclosed
     during business transactions with the Contractor. Sprint Spectrum and the
     Owner or Lessor
<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT 
PAGE 11 OF 15

- --------------------------------------------------------------------------------

     have devoted substantial time and expense in the field of wireless
     communications and, in doing so, have acquired proprietary information
     which they desire to remain confidential in order to promote their
     corporate growth and security. The business relationship between and among
     Sprint Spectrum, the Owner or Lessor, and the Contractor will entail the
     possible disclosure of certain proprietary information to one another,
     including, among other things, information regarding each parties'
     respective assets, liabilities, operations, financial conditions,
     employees, plans, prospects, management, investors, products, strategies
     and techniques, the technical characteristics and operations of each
     parties' products, and the identity of suppliers and customers and the
     nature and extent of their business relationships with such party.
     Therefore, Sprint Spectrum and the Contractor agree to the following
     conditions:

     a)   All proprietary information of Sprint Spectrum and of the Owner or
          Lessor will be treated with the strictest confidence. Contractor will
          not disclose proprietary information to any third party and will not
          make use of that proprietary information, except for such information
          necessary to transact business between Sprint Spectrum and the
          Contractor. The Contractor shall not provide proprietary information
          to individuals not significantly involved in the proposed transaction.

     b)   The Contractor shall not develop any new techniques or ideas relating
          to Sprint Spectrum's proprietary information or that of the Owner or
          Lessor that would have a negative impact on their competitiveness.

     For purposes of this Paragraph 8, Sprint Spectrum PCS Network, RF design
     criteria and search areas are deemed to be proprietary.

9.   During the term of this Agreement and for two (2) years thereafter (the
     "Restricted Period"), neither the Contractor nor Sprint Spectrum will
     adversely affect the reputation of the other party or of the Owner or
     Lessor of a Site nor disclose information to any entity concerning their
     business affairs. During the Restricted Period, the Contractor and Sprint
     Spectrum also agree not to divert or solicit any of the other party's
     employees on behalf of itself. For so long as the Contractor is providing
     services to Sprint Spectrum, and for two years following completion of
                                  -----------------------------------------
     those services, the Contractor agrees not to become an investor, partner,
     --------------
     shareholder, officer, director, joint venturer or affiliate of any kind
     with an entity providing PCS services or creating a PCS Network in the
     Pittsburgh Metropolitan Area.
<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT
PAGE 12 OF 15

- --------------------------------------------------------------------------------

10.  Because money damages would not be sufficient remedy for a breach of this
     Agreement, Sprint Spectrum shall be entitled to obtain injunctive relief in
     addition to monetary damages if a breach were to occur.

11.  The Contractor shall defend, indemnify, save and hold harmless Sprint
     Spectrum, its parents, subsidiaries, affiliates, their directors, officers,
     agents, and the employees from any and all liabilities, claims, or demands
     (including costs, expenses, and reasonable attorney's fees) that may be 
     made by any person, specifically including, but not limited to, employees
     or agents of the Contractor, and including but not limited to, employees or
     agents of the Contractor's subcontractors, for injuries, including death to
     persons, or damage to property, including theft, arising out of this
     Agreement, by reason of any act, omission, misconduct, negligence or
     default on the part of the Contractor, any subcontractor or any employee of
     the Contractor or subcontractor; and, except, as may otherwise be provided
     by applicable law, such rights to indemnification shall obtain regardless
     of whether any act, omission, misconduct, negligence or default (other than
     gross negligence or willful misconduct) of Sprint Spectrum or its employees
     contributed or may be alleged to have contributed in any way thereto. The
     Contractor shall defend Sprint Spectrum at Sprint Spectrum's request
     against any such liability, claim or demand. The foregoing indemnification
     shall apply whether the Contractor or Sprint Spectrum defends such suit or
     claim and shall extend to any costs incurred by Sprint Spectrum to enforce
     the terms of this indemnification. Sprint Spectrum agrees to notify the
     Contractor promptly of any written claims or demands against Company for
     which the Contractor is responsible hereunder.

12.  If the Contractor causes damage to the work or property of any separate
     vendor on the Site, the Contractor shall, upon due notice, settle with such
     separate vendor by agreement. If such separate vendor sues Sprint Spectrum
     on account of any damage alleged to have been so sustained, Sprint Spectrum
     shall notify the Contractor of such proceedings. The Contractor shall
     indemnify and hold Sprint Spectrum harmless from and pay or satisfy any
     judgment which may be entered against Sprint Spectrum in any such
     proceedings. The Contractor shall reimburse Sprint Spectrum for any and all
     reasonable attorney's fees and court costs which Sprint Spectrum may incur
     incident to the defense of the said claim, whether or not the claim is
     defended by Sprint Spectrum or the Contractor.

13.  It is mutually agreed that any controversies, disputes or claims of any
     nature arising out of or relating to this Agreement, or the breach thereof,
     may, at the discretion of either party to this Agreement, be settled by
     Arbitration in accordance with the then current Construction Industry
     Arbitration Rules of the American Arbitration Association (in the
     Pittsburgh, Pennsylvania office only) and that all findings and
<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT 
PAGE 13 OF 15

- --------------------------------------------------------------------------------

     decisions by the Arbitrators shall be conclusive and binding on both
     parties and shall not be appealable and judgment upon the award rendered by
     the Arbitration Panel may be entered into the Court of Common Pleas of
     Allegheny County. Upon the written request of Sprint Spectrum, the
     Contractor shall join any subcontractor of the Contractor in such
     Arbitration. Nothing in this section of this Agreement's provisions shall
     create any claim, right or cause of action in the favor of the
     subcontractor against Sprint Spectrum.

     If so determined by the Arbitrators, and to the extent so determined by the
     Arbitrators, the fees, costs and expenses of the Arbitration shall be borne
     by the party against whom the Arbitration is determined.

     The Contractor shall proceed with the Work under this Agreement during any
     claims, disputes, questions or related matters or proceedings unless
     otherwise agreed to by the Contractor and Sprint Spectrum in writing. If
     the Contractor is proceeding with the Work or any portion thereof, under
     protest, the Contractor must notify Sprint Spectrum in writing prior to
     commencing of the Work or any such portion.

     No payment or partial payment on any claim shall be made prior to final
     resolution of such claim.

     Sprint Spectrum and the Contractor agree that they shall not make any claim
     against any officer, agent, or employee of the other party to this
     Agreement for, or on account of, any act or omission to act in connection
     with this Agreement, except for acts of willful misconduct, and the parties
     hereby waive any and all rights to make any such claim or claims.

     Notwithstanding the foregoing, the rights to injunctive relief set forth in
     Paragraph 10 hereof, may be heard only by the state or federal courts
     located in Allegheny County, Pennsylvania.

14.  This Agreement, being one of personal services, may not be assigned by the
     Contractor nor may any obligation of the Contractor hereunder be assumed by
     any other person or third party without the prior written consent of Sprint
     Spectrum.

15.  Any notice or demand required to be given in this Agreement shall be made
     by certified or registered mail, return receipt requested, or reliable
     overnight courier to the address of other parties set forth below:

          Contractor:         Crown Network Systems, Inc.
                              Penn Center West III, Suite 229
                              Pittsburgh, PA 15276
<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT 
PAGE 14 OF 15

- --------------------------------------------------------------------------------

                              Attn:  Robert A. Crown, President

          Sprint Spectrum:    Sprint Spectrum,L.P.
                              Penn Center West II, Suite.200
                              Pittsburgh, PA 15276
                              Attn:  David P. Snyder, Director of Operations
                                     and Engineering

     Any such notice is deemed received one (1) business day following deposit
     with a reiable overnight courier or two (2) business days following deposit
     in the United States mails addressed as required above. Contractor or
     Sprint Spectrum may from time to time designate any other address for this
     purpose by written notice to the other party.

16.  This Agreement may be executed simultaneously in several counterparts, each
     of which shall be deemed to be an original, but all of which shall
     constitute one and the same instrument.

17.  This Agreement shall be binding upon Sprint Spectrum and the Contractor,
     their respective successors and assigns. Moreover, if any portion of this
     Agreement shall be deemed legally unenforceable, the unenforceability of
     that particular portion, including its restrictive covenants, shall not
     limit the enforceability of that particular portion, including its
     restrictive covenants, shall not limit the enforceability of any other
     provision.

18.  All obligations under this Agreement unless otherwise provided herein,
     shall be for a period of two years from the date of this Agreement.

19.  Neither party shall disclose the terms of this Agreement to an unaffiliated
     third party (other than attorneys, accountants, or lenders, or as part of
     financial statements or to a prospective purchaser of all or substantially
     all of the business or assets of the disclosing party) unless such terms
     are or become publicly available (other than through unauthorized
     disclosure by the parties), as required by law to be disclosed, or with
     the prior written consent of the nondisclosing party.

20.  Time is of the essence of this Agreement; it being understood that if the
     Contractor is delayed in the progress of the Work by changes ordered in the
     Work, by labor disputes, fire, unusual delay in deliveries of materials, or
     unavoidable casualties the time for performance shall be extended for the
     period of such delay, but, for all Sites where a Notice to Proceed is
     issued within 90 days of the date hereof, such extension be for more than
     30 days.
<PAGE>
 
INDEPENDENT CONTRACTOR AGREEMENT
PAGE 15 OF 15

- --------------------------------------------------------------------------------

21.  The laws of the Commonwealth of Pennsylvania, disregarding conflict of law
     principles, shall govern this Agreement. Further, each party submits to the
     jurisdiction of any federal or commonwealth court sitting in Allegheny
     County, Pennsylvania.

Intending to be legally bound hereto, this Agreement is entered into by the 
parties as of the day and year written above.

Crown Network Systems, Inc.

/s/ Robert Crown Pres.                  /s/ Patricia A. Sachs
- ---------------------------------       ----------------------------------
Robert Crown, President                 Witness

                                            Patricia A. Sachs
                                        ----------------------------------
                                        Print Name
Sprint Spectrum L.P.

/s/ Kurt Bagwell                        /s/ Lori Bringus
- ---------------------------------       ----------------------------------
Kurt Bagwell                            Witness
Assistant Vice President, Engineering
and Operations, East Region                 Lori Bringus
                                        ----------------------------------
                                        Print Name
<PAGE>
 
                                   EXHIBIT A
                                   ---------
                            INSURANCE REQUIREMENTS


Commercial general liability insurance providing coverage for operations and for
contractual liability with respect to liability assumed by subcontractor herein.
The limits of coverage for such insurance shall not be less than
$1,000,000/$2,000,000 for bodily injury and $ 1,000,000 for property damage.

Comprehensive automobile liability insurance covering the use and maintenance of
owned, non-owned, hired and rented vehicles with limits of coverage of not less
than a combined single limit of $500,000 or not less than $250,000 per person
and $500,000 per occurrence for bodily injury and not less than $300,000 per
occurrence for property damage.

Workers' Compensation insurance with statutory limits of coverage.

Excess liability insurance in the umbrella form with a combined single limit of
$5,000,000.

The insurance carriers and the form of the insurance policies shall be subject
to approval by Sprint Spectrum, which approval shall not be unreasonably
withheld or delayed. Sprint Spectrum shall be named as an additional insured on
all such policies. All insurance policies provided hereunder shall be endorsed
to provide Sprint Spectrum with thirty (30) days' notice of cancellation and/or
restriction. If the initial insurance policies required by this Agreement expire
prior to the completion of the Work, renewal certificates of insurance of policy
shall be furnished thirty (30) days prior to the date of their expiration. The
Contractor shall furnish to Sprint Spectrum certificates of such insurance
issued by the insuring carrier in a form satisfactory to Sprint Spectrum within
ten (10) days of the execution of this Agreement but in any case, prior to
commencement of the Work, and thereafter upon written request of Sprint
Spectrum. The fulfillment of such obligations, however, shall not otherwise
relieve the Contractor of any liability assumed by the Contractor hereunder or
in any way modify the Contractor's obligations to indemnify Sprint Spectrum.
<PAGE>
 
                                  EXHIBIT "C"
                                  ----------- 
                          CROWN NETWORK SYSTEMS, INC.

Any additional services performed by Contractor shall be subject to the
following hourly rates:

<TABLE> 
<CAPTION> 
     CLASSIFICATIONS                          RATES            
     ---------------                          -----            
     <C>                                     <S> 
     President                                 [*]
     Legal                                     [*]
     Vice President                            [*]
     Program Director                          [*]
     Operations Manager                        [*]
     Operations Supervisor                     [*]
     Construction Coordinator                  [*]
     Property Site Researcher                  [*]
     Project Manager                           [*]
     Draftsman                                 [*]
*    Tower Rigger                              [*]
*    Skilled Laborer                           [*]
*    Technician                                [*]
     Office Clerical                           [*]
*    Electrician                               [*]
</TABLE> 

     All hourly rates above do not include reasonable travel and lodging
     expenses and shall be invoiced by the quarter-hour.

<TABLE> 
<CAPTION> 
     EQUIPMENT                                RATES              
     ---------                                -----              
     <C>                                     <S> 
     580 Backhoe                              [*]
     Equipment Truck/Class 1 (daily)          [*]
         Mileage Charge                       [*]
     Equipment Truck/Class 2 (daily)          [*]
         Mileage Charge                       [*]
     18 Ton Truck Crane                       [*]
     28 Ton Truck Crane                       [*]
     Tractor Trailer with 40 Ton Lowboy       [*]
     Tractor Dump Trailer                     [*]
     Single Axle Dump Truck                   [*]
     977L High Lift                           [*]
     D4 Dozer                                 [*]
     Uniloader                                [*]
     Vibratory Roller                         [*]
     Operator Overtime                        [*]
     Quickie Saw (daily)                      [*]
</TABLE> 

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.


<PAGE>
 
<TABLE> 
     <C>                                     <S> 
     Tamper (daily)                          [*]
     Chain Saw (daily)                       [*]
     Portable Generator (daily)              [*]
</TABLE> 

*    Only those Classifications with asterisks are includable as costs in the
     Contractor's proposal for the Construction Services Fee.

[*]  Indicates where text has been omitted pursuant to a request for 
confidential treatment. The omitted text has been filed with the Securities
and Exchange Commission separately.

<PAGE>
 
                                  EXHIBIT "B"
                                  ----------- 


CONSTRUCTION MANAGEMENT
- -----------------------

Site Assessment

     -    Site walk and development of Site plan with Sprint Spectrum
          Construction
     -    Frequency capability study
     -    Space planning in buildings

Site Plan/Site Survey/Construction Documentation

     -    Provide copies of existing Site plan as prepared by a land surveyor
          for each Site
     -    Provide CAD drawings of Site design including as-built drawings
          defining antenna layout, equipment layout, AC and Telco interconnect
          locations and Site grounding
     -    Provide copies of existing tower design and manufacturers structural
          capabilities

Management Services

     -    Develop a scope of work for each Site
     -    Develop a materials list for each Site including but not limited to,
          antennas, coaxial cable, connectors, mounting brackets, wave guide,
          cable ladder, grounding kits, cable ports, weather proofing kits and
          jumpers
     -    Manage the Building Permit process to include preparation of
          documents, meetings with permit officials to develop a complete permit
          package, filing the permit. Permit fees will be paid by Sprint
          Spectrum
     -    Manage all Site construction activities including but not limited to,
          subcontractors schedules, coordination of deliveries, on-site
          management, ordering and installation of AC power and Telco
     -    Final Site walk-down with Sprint Spectrum to develop a "Punch list"
          and completion of the "Punch list" activities
     -    Make the Site available for equipment installation by Lucent and
          assure Lucent's installers maintain approved Site standards

WAREHOUSING AND MATERIAL HANDLING
- ---------------------------------

     -    Order third party materials from Sprint Spectrum approved vendors with
          no additional markup, including but not limited to, Coaxial cable,
          connectors, grounding kits, antennas, jumpers and mounting brackets
<PAGE>
 
     EXHIBIT "B" cont'd



     -    Store materials at Contractors warehouse
     -    Manage material distribution from Contractor's warehouse to each Site
     -    Asset management to assure proper use, storage and tracking and
          security of Sprint Spectrum materials


CONSTRUCTION SERVICES
- ---------------------

     All construction is to be performed in strict compliance with standards,
specifications and drawings approved by the Sprint Spectrum Wireless
Implementation Manager and will include but not be limited to:

     -    Preparation for and installation of ground pad and/or mounting
          brackets for PCS Base Station equipment
     -    Installation of GPS and PCS antennas and supporting brackets and
          mounts
     -    Preparation and installation of coaxial cables, connectors, waterproof
          connector covers, grounding kits and accessories between the Base
          Station equipment and the antennas
     -    Preparation and installation of disaster prevention grounding system
          to include the grounding ring and equipment grounds
     -    Other mutually agreed upon miscellaneous constructions tasks as may be
          reasonably requested from time to time by Sprint Spectrum
<PAGE>
 
               ADDENDUM TO THE INDEPENDENT CONTRACTOR AGREEMENT
                                    between
                          Crown Network Systems, Inc.
                                      and
                             Sprint Spectrum L.P.
                              dated 08 July 1996

                      ____________________________________

THIS ADDENDUM is entered into this 12th day of November 1997, by and between
                                   ----        --------  
CROWN NETWORK SYSTEMS, INC., a Pennsylvania corporation (the "Contractor"),
with an office at Penn Center West III, Suite 229, Pittsburgh, Pennsylvania
15276 and SPRINT SPECTRUM L.P., a Delaware limited partnership ("Sprint
Spectrum"), with an office at Penn Center West II, Suite 200, Pittsburgh,
Pennsylvania 15276.

     WHEREAS, Contractor and Sprint entered into an Independent Contractor
Agreement dated July 8, 1996, under which Contractor was approved to perform
construction services for Sprint Spectrum on selected communications sites for
Sprint Spectrum's Personal Communications System ("PCS") in the Pittsburgh
Metropolitan Trading Area; and,

     WHEREAS, Contractor and Sprint have agreed that certain inventory for
Sprint Spectrum must be warehoused; and,

     WHEREAS, Contractor has the space available for such warehousing of
equipment;

     NOW THEREFORE, in consideration of the mutual covenants contained in this
Addendum and for other good and valuable consideration, the receipt of which is
hereby acknowledged, the parties intending to be legally bound agree to the
following terms and conditions.

1.   Contractor does hereby lease, remise and let to Sprint Spectrum, for the
purpose hereinafter set forth, certain dedicated contiguous storage space as
herein further defined, being part of 2656 Idlewood Road, Pittsburgh,
Pennsylvania, operated by Contractor (the "Resource Center");

     TOGETHER WITH such routes of ingress and egress thereto and therefrom as
are presently held by Contractor;

     TO HAVE AND TO HOLD initially a maximum of 5,000 square feet of dedicated
contiguous storage space, both indoor and outdoor, such locations to be
indicated in Exhbit "A" to this Addendum ("Storage Space").

                                       1
<PAGE>
 
2.   The term of the occupancy of the storage space shall be month-to-month,
commencing on October 27, 1997. This tenancy automatically renews itself for
subsequent one month periods until notice of cancellation is served on either
party at least 15 days prior to the expiration of the current monthly term.

3.   Sprint Spectrum agrees that its agents, servants and workmen will be
allotted the use of parking spaces available at the Resource Center location on
a first-come first-serve basis. It is further understood and agreed that all
truck traffic areas will remain unobstructed, free and clear at all times.

4.   The parties to this Addendum do hereby further agree that the monthly
rental fee for the indoor storage space shall be [*]; and [*] for outdoor space.

     It is further understood and agreed that the square footage charge will be
based on the greater of 1,000 square feet or on the actual space that Sprint
Spectrum is occupying.

     The Contractor will provide a rate structure for shipping of inventory from
Resource Center to a particular construction site or other mutually agreed upon
locations, which will be available for Sprint Spectrum and all of its agents,
servants and workmen.

5.   The parties to this Addendum do hereby further agree that all required
equipment and trained operators of Contractor at the Resource Center will be
provided on a time and material basis with no minimum requirements. The parties
hereto agree and understand that the standard rates for "typical" equipment to
be used at the Resource Center are as follows:

          Crane (35 ton)               [*]
          Forklift                     [*]
          Pallet Jack                  [*]
          Boom Truck (23 ton)          [*]

     Additional equipment may be supplied as required with rates for such
equipment to be provided on an as-need basis.

6.   Any permits for oversize equipment/material hauling will be a reimbursable
cost and passed directly on to Sprint Spectrum. Any expense that requires
reimbursement from Sprint Spectrum must be approved, in writing, in advance of
the billable expense in this regard.

                                       2

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
     Contractor may provide the following heavy equipment based on a cost per
job basis with such cost to be determined by Contractor at time of use:

          Truck Tractor and Semi-Tractor (40 ft. Flatbed or 35 ton Lowboy) 
          22 ft. Dry Van (Box Truck)                                     
          Stake Truck                                                    
          Pickup Truck                                                   
          Five Ton Tag-along Trailer                                      

7.   Resource Center activities not included in this Addendum include, but are
not limited to, long distance transportation, special materials handling,
operations at remote warehouses, out-of-state operations, etc., and will be
quoted on an as-needed basis.

8.   The parties understand and agree that the Contractor will supply employees
to work in the storage space on an "as-needed" basis at a standard time and rate
of [*].

9.   Contractor agrees that its employees will handle the "batteries" for Sprint
Spectrum provided that the batteries are shipped and packaged in accordance with
Contractor's standards. Contractor's standards shall be specifically outlined
and communicated, in writing, to Spring Spectrum, upon execution of this
Addendum.

10.  Contractor agrees to provide reasonable maintenance and general custodial
service to the storage space and Resource Center, i.e. parking lots, washrooms,
doors, lights, water, sewage, driveway and snow removal. Contractor further
agrees to provide the cleaning supplies and services.

11.  Contractor further agrees that Sprint Spectrum shall have 24 hour, seven
day accessibility to the Resource Center and storage space. Sprint Spectrum
agrees that office space accessibility shall be limited and restricted to the
hours between 6:00 a.m. and 6:00 p.m., Monday through Saturday.

     IN WITNESS WHEREOF, the parties hereto have caused this instrument to be

                                       3

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
executed by their respective duly authorized representatives as of the day and
year first above written.


Attest:                                    Crown Network Systems, Inc.     

/s/ Barbara A. Crown                       By: /s/ Robert Crown
- --------------------                          ------------------------------ 
(seal)                                        Robert Crown, President 


Witness:                                   Sprint Spectrum L.P.

/s/ Lara Ray                               By: [SIGNATURE ILLEGIBLE]
- -------------------                           ------------------------------ 
                                                  [SIGNATURE ILLEGIBLE]
                                           Title:---------------------------

                                       4

<PAGE>
 
                                                                EXHIBIT 10.12
 
                       INDEPENDENT CONTRACTOR AGREEMENT
================================================================================
              WITH CONFIDENTIALITY AND NON-COMPETITION AGREEMENTS


          THIS AGREEMENT is entered into as of this 30th day of September 1996
between CROWN NETWORK SYSTEMS, INC., a Pennsylvania Corporation (the
"Contractor"), with an office at Penn Center West III, Suite 229, Pittsburgh,
Pennsylvania 15276, and POWERFONE, INC. D/B/A NEXTEL COMMUNICATIONS, a Delaware
Corporation, with its principal offices located at 31200 Carter Street, Solon,
OH 44139.

          WHEREAS, the Contractor has been approved to perform construction
services for NEXTEL on selected communications sites (each of which is referred
to herein as a "Site") for NEXTEL's Communications System in the counties set
forth in the Master Lease Agreement entered into by the parties this same date.

          In consideration of the mutual covenants and promises set forth
herein, the parties hereto, intending to be legally bound hereby, agree as
follows:

          1.  NEXTEL will require the services of a contractor to perform
              various construction services in connection with the Sites
              ("Work"). The Work for each Site shall consist of all materials,
              supplies, services, equipment, technical specifications and other
              items set forth in a Notice to Proceed (as defined in Paragraph 3
              hereof). For the initial Site installation, the Work is identified
              in Exhibit "A" and will be performed by Contractor for a fixed fee
              as described in Exhibit "B" attached hereto ("Fixed Fee").

          2.  With respect to the Fixed Fee, Contractor shall send its invoice
              to NEXTEL following Contractor's installation of NEXTEL's antennas
              and coaxial at the Site. Payment by NEXTEL shall be due within
              thirty (30) calendar days from receipt of the Contractor's
              invoice. With respect to the Fixed Fee, NEXTEL may withhold up to
              [*] of the Fixed Fee pending NEXTEL's final acceptance of
              the Work at the Site as defined below. The [*] balance of
              the Fixed Fee is due within thirty (30) calendar days of final
              acceptance by NEXTEL. With respect to all other Work, payment
              shall be due as provided in Section 4.

          3.  In connection with any Work other than the initial Site
              installation, CROWN shall have a right of first refusal to meet
              any bona fide bid selected by NEXTEL to perform such Work upon the
              same terms and conditions set forth in such bid. CROWN shall have
              seven (7) business days after the receipt of such bid to notify
              NEXTEL whether CROWN intends to meet such bid and perform the Work
              in accordance with the bid. In the event CROWN does not notify
              NEXTEL within such time, NEXTEL may proceed to contract 

                                       2
[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
              with said selected bid. NEXTEL shall issue to the Contractor a
              written notice confirming the price and terms agreed upon and
              fixing the date on which the Contractor shall commence performance
              of its obligations under this Agreement (the "Notice to Proceed").
              The Contractor shall commence the Work, pursuant to this
              Agreement, on each Site promptly upon the commencement date set
              forth in the Notice to Proceed and shall prosecute the Work on
              each Site diligently to completion. The Contractor shall not
              perform any of the Work or make any financial commitments until
              receiving the Notice to Proceed. The performance of any portion of
              the Work or preparation to perform any of the Work by the
              Contractor, prior to receiving the Notice to Proceed, is done at
              the Contractor's own risk.

          4.  Upon final completion of the entire Work at each Site by the
              Contractor in accordance with the provisions of this Agreement,
              the Contractor shall request, in writing, final inspection of the
              Work. NEXTEL will inspect the Work within three (3) business days
              of the receipt of Contractor's notice that the Work is complete.
              Within three (3) business days of the inspection, NEXTEL will
              either provide a signed writing evidencing final acceptance of the
              Work or, through the use of a punch list form, advise the
              Contractor of the portions of the Work that are defective or
              incomplete or of obligations that have not been fulfilled but are
              required for final acceptance. The Contractor shall complete any
              unfinished or defective portion of the Work which is necessary to
              install and operate NEXTEL's equipment within ten (10) working
              days following issuance of the punch list. With respect to other
              punch list items, Contractor shall complete all unfinished or
              defective portions of the Work within sixty (60) calendar days
              following issuance of the punch list. After final acceptance of
              the Work, NEXTEL shall pay the Contractor the Construction
              Services Fee identified in the Work within thirty (30) days from
              the date of receipt of the Contractor's invoice .

          5.  NEXTEL will, from time to time, provide the Contractor with a list
              of materials and equipment which NEXTEL will supply (the "List").
              The Contractor will use the materials and equipment supplied by
              NEXTEL and will not substitute any of the same without NEXTEL's
              prior written consent. Materials and equipment supplied by NEXTEL
              shall be inspected, approved and accepted by the Contractor and
              become part of the Work of this Agreement. If materials or
              equipment are required which are not on the List, the Contractor
              may supply such materials or equipment itself or obtain them from
              independent parties. If the Contractor supplies any materials,
              equipment or labor it shall be based on the Contractor's published
              rates as set forth on Exhibit "C" attached hereto.

          6.  Notwithstanding any other provision contained in the Work or any
              other document exchanged by the parties, the following terms and
              conditions shall apply with respect to this Agreement and the
              materials, equipment and services provided hereunder:

               a)   The Contractor, its agents, subcontractors, and employees
                    shall perform the Work as independent contractors, and not
                    as agents, partners, joint venturers or employees of NEXTEL.
                    The Contractor shall supervise and direct the Work, using
                    the care and skill ordinarily used by members of the
                    Contractor's profession practicing under similar conditions
                    at the same time and in the same 

                                       3
<PAGE>
 
                    geographic area, and the Contractor shall be solely
                    responsible for all construction means, methods, techniques,
                    sequences and procedures and for coordinating all portions
                    of the Work.

               b)   Unless otherwise specifically provided in the Work, the
                    Contractor shall provide and pay for all labor, supervision,
                    materials, construction surveys and layout, equipment,
                    tools, construction equipment and machinery, water, heat,
                    utilities, transportation, and other facilities and services
                    necessary for the proper execution and completion of the
                    Work, whether temporary or permanent, and whether or not
                    incorporated or to be incorporated in the Work and any other
                    items incidental to the execution of the Work, all as
                    indicated or which may reasonably be implied from the Work.

               c)   The Contractor shall at all times enforce strict discipline
                    and good order among its employees and shall not employ on
                    the Work any unfit person or anyone not skilled in the task
                    assigned to such person.

               d)   The Contractor hereby represents and warrants to NEXTEL that
                    all materials and equipment incorporated in the Work will be
                    new unless otherwise requested in writing by the Contractor
                    and agreed to in writing by NEXTEL prior to their use. The
                    Contractor further represents and warrants that the Work to
                    be performed under this Agreement, and all workmanship,
                    materials and equipment provided, furnished, used or
                    installed in construction of the same, shall be safe,
                    substantial and durable construction in all respects, and
                    that all of the Work will be free from faults and defects
                    and in conformance with the terms of the Work. All of the
                    Work, including all materials and equipment, not conforming
                    to these requirements may be considered defective by NEXTEL.
                    This warranty for each Site shall be for a period of twelve
                    (12) months from the date of full acceptance of the Work on
                    each Site by NEXTEL (the "Warranty Period"). The warranty
                    provided herein shall be in addition to and not in
                    limitation of any other warranty or remedy required by law
                    or this Agreement.

                    The Contractor agrees to correct any defective portion of
                    the Work, including all materials and equipment during the
                    Warranty Period; provided, however, that materials supplied
                    by NEXTEL which are installed and tested by the Contractor
                    and accepted by NEXTEL and are thereafter found to be
                    defective shall be replaced by the Contractor at the expense
                    of NEXTEL in accordance with the Contractor's published
                    rates as set forth on Exhibit "C". If the Contractor fails,
                    after ten (10) days following notice from NEXTEL: (i) to
                    commence and continue correction of such defective Work with
                    diligence and promptness; (ii) to perform the Work; or (iii)
                    to comply with any other provision of this Agreement, NEXTEL
                    may correct and remedy any such deficiency. In connection
                    with such corrective and remedial action, NEXTEL may take
                    possession of all or part of the Work, and suspend the
                    Contractor's services related thereto, take possession of
                    and incorporate in the Work all materials and equipment paid
                    for by NEXTEL which either are stored at the Site or are
                    stored 

                                       4
<PAGE>
 
                    elsewhere. The Contractor shall allow NEXTEL, its agents,
                    representatives and employees, access to the Site to enable
                    NEXTEL to exercise the rights and remedies as stated
                    hereunder. All claims, costs, losses and damages reasonably
                    incurred or sustained by NEXTEL in exercising such rights
                    and remedies will be charged against the Contractor and may
                    be deducted from monies due or to become due to the
                    Contractor; and NEXTEL shall be entitled to an appropriate
                    decrease in the Construction Services Fee or any other
                    remedy permitted in this Agreement or allowed by law. Such
                    claims, costs, losses and damages will include, but not be
                    limited to, all costs of repair or replacement for work of
                    others destroyed or damaged by correction, removal or
                    replacement of the Contractor's defective work. No extension
                    of the time for completion will be given or inferred due to
                    the exercise by NEXTEL of NEXTEL's rights and remedies
                    hereunder. The Contractor shall not be responsible for
                    reasonable delays caused by inclement weather which
                    typically delays a reasonable contractor's performance of
                    work substantially similar to the Work set forth herein.

               e)   The Contractor shall give all notices and comply with all
                    laws, ordinances, rules, regulations, and lawful orders of
                    any public authority bearing on the performance of the Work
                    (hereinafter "Laws and Regulations"), and shall promptly
                    notify NEXTEL if the terms of the Work are at variance
                    therewith.

                    Unless otherwise set forth herein, the Contractor shall
                    obtain at its expense, all necessary local and municipal
                    permits, licenses, inspections, certificates and approvals
                    of the Work and shall ensure compliance with all state
                    environmental laws and shall furnish utilities it may
                    require to perform the Work. NEXTEL shall pay all fees for
                    such permits, licenses, inspections, certificates or
                    approvals to the appropriate government body or other
                    entity.

                    The Contractor shall at all times itself observe and comply
                    with, and cause all its agents and employees to observe and
                    comply with, all such existing and future Laws and
                    Regulations; and shall protect and indemnify NEXTEL, its
                    officers and agents, against any claims or liability arising
                    from or based upon violation of such Laws and Regulations,
                    whether by itself or its agents or employees.

               f)   The Contractor shall be responsible to NEXTEL for the acts
                    and omissions of its employees, subcontractors and their
                    agents and employees, and other persons performing any of
                    the Work under a contract with the Contractor.

               g)   The Contractor at all times shall keep the Site free from
                    accumulation of waste materials or rubbish caused by its
                    operations. At the completion of the Work, the Contractor
                    shall remove all its waste materials and rubbish from and
                    about the project as well as its tools, construction
                    equipment, machinery and surplus materials. If the
                    Contractor fails to clean up as provided pursuant to this
                    Agreement, NEXTEL may do so and the reasonable cost thereof
                    shall be charged to the Contractor and may be deducted from
                    monies due or to become due to the Contractor.

                                       5
<PAGE>
 
               h)   The Contractor shall protect, maintain and secure the Work
                    during construction and until final acceptance of the Work.
                    This protection, maintenance and security shall be
                    continuous so that the Work is protected, maintained and
                    secured in satisfactory condition at all times. All costs of
                    protection, maintenance and security before final acceptance
                    of the Work shall be part of the Construction Services Fee.

               i)   If a temporary, preliminary or permanent injunction is
                    secured because of an alleged patent or proprietary rights
                    infringement, which prevents NEXTEL from using the process,
                    materials or equipment furnished, utilized or installed, the
                    Contractor, at its expense, shall within thirty (30)
                    calendar days following notification either: 1) procure the
                    right for NEXTEL to continue using the same process,
                    materials or equipment; or 2) modify the process, materials
                    or equipment, or provide a replacement process, materials or
                    equipment which is non-infringing, and is reasonably
                    satisfactory to NEXTEL. The Contractor shall defend all
                    suits or claims for infringement of any patent or
                    proprietary rights and pay all the costs associated
                    therewith including reasonable attorneys' fees of NEXTEL and
                    shall save NEXTEL harmless from loss on account thereof. The
                    obligations of the Contractor under this paragraph shall
                    survive the termination or expiration of this Agreement.

               j)   NEXTEL reserves the right to conduct, at its expense, any
                    test or inspection it may deem advisable to assure that
                    construction, supplies and services conform to the
                    provisions of this Agreement, including the Work.

               k)   The Contractor shall take reasonable safety precautions with
                    respect to performance of this Agreement, shall comply with
                    all safety measures initiated by NEXTEL and all applicable
                    laws, ordinances, rules, regulations and orders of public
                    authorities for the safety of persons or property.

               l)   The Contractor may be ordered in writing by NEXTEL, without
                    invalidating this Agreement, to make changes in the Work
                    within the general scope of this Agreement consisting of
                    additions, deletions or other revisions, the Construction
                    Services Fee and time for completion being adjusted
                    accordingly. The Contractor, prior to the commencement of
                    such changed or revised portion of the Work, shall submit
                    promptly to NEXTEL written copies of a claim for adjustment
                    to the Construction Services Fee, and time for completion,
                    for such revised Work in a manner consistent with
                    requirements of this Agreement. The Contractor may request a
                    change in the Work by providing NEXTEL with a written
                    request describing the change. If such change is acceptable
                    to NEXTEL, NEXTEL shall provide a written change order to
                    the Contractor as set forth above. NEXTEL shall have five
                    (5) business days to either provide the Contractor with the
                    requested change order or provide written notice that the
                    request is denied. If NEXTEL fails to provide such notice
                    within the five (5) business day period, the requested
                    change order will be deemed to have been accepted by NEXTEL.
                    The Contractor shall not perform any change in the Work,
                    including additions, 

                                       6
<PAGE>
 
                    deletions or other revisions, without prior written
                    authorization from NEXTEL.

               m)   The Contractor shall defend, indemnify and hold harmless
                    NEXTEL and its agents and employees from and against all
                    liability, claims, damages, losses and expenses of whatever
                    nature, including, but not limited to attorneys' fees
                    arising out of or resulting from the performance of the
                    Work, provided that any such liability, claim, damage, loss
                    or expense: 1) is attributable to bodily injury, sickness,
                    disease or death, or to injury to or destruction of tangible
                    property including the loss of use resulting therefrom; and
                    2) is caused in whole or in part by any negligent act or
                    omission or act of willful misconduct of the Contractor, any
                    subcontractor, anyone directly or indirectly employed by any
                    of them or anyone for whose acts any of them may be liable,
                    regardless of whether or not it is caused in part by a party
                    indemnified hereunder. Such obligation shall not be
                    construed to negate, abridge or otherwise reduce any other
                    right as to any party or person described in this paragraph.
                    In any and all claims against NEXTEL or any of its agents or
                    employees, by an employee of the Contractor, any
                    subcontractor, anyone directly or indirectly employed by any
                    of them or anyone for whose acts any of them may be liable,
                    the indemnification obligation under this paragraph shall
                    not be limited in any way by any limitation on the amount or
                    type of damages, compensation or benefits payable by or for
                    the Contractor or any subcontractor under workers'
                    compensation acts, disability liability benefits acts or
                    other employee benefit acts.

               n)   The Contractor shall purchase and maintain insurance for
                    protection from claims under workers' compensation and other
                    employee benefit acts, claims for damages because of bodily
                    injury, including personal injury, sickness or disease or
                    death. The Contractor shall also purchase and maintain
                    insurance for protection from claims or damages to property,
                    including loss of use resulting therefrom, which may arise
                    out of or result from the Contractor's operations under this
                    Agreement, whether such operations be by the Contractor, its
                    employees and agents, or any subcontractor and its agents
                    and employees or anyone directly or indirectly employed by
                    any of them. The insurance shall be written with limits and
                    coverage acceptable to NEXTEL in accordance with Exhibit "D"
                    attached. Certificates of such insurance shall provide
                    thirty (30) days notification in writing to NEXTEL if
                    material change or cancellation takes place and certificates
                    shall also indicate that NEXTEL shall be named as additional
                    insured as respects the operations of the insured in
                    accordance with the Construction Agreement.

               o)   If the Contractor persistently or repeatedly fails or
                    neglects to carry out the Work at a Site in accordance with
                    this Agreement, or fails to observe the safety rules and
                    other rules and regulations governing performance of the
                    Work at a Site, and fails within five (5) business days
                    after receipt of written notice to commence and continue
                    correction of such default or neglect with diligence and
                    promptness, NEXTEL may, without prejudice to any other
                    remedy that NEXTEL may have, terminate the Contractor and
                    finish the Contractor's Work at a Site by whatever method
                    NEXTEL may deem expedient. If the expense of finishing the

                                       7
<PAGE>
 
                    Contractor's Work at a Site exceeds the value of the
                    Construction Services Fee, the Contractor shall pay the
                    difference to NEXTEL. The Contractor shall not be
                    responsible for delays caused by inclement weather which
                    typically delays a reasonable contractor's performance of
                    work substantially similar to the Work set forth herein.

                    To the extent the Contractor is terminated at a Site, the
                    Contractor shall immediately take all steps to protect the
                    subcontracts for labor, materials, equipment or services
                    with respect to the termination. NEXTEL may then withhold
                    payment to the Contractor until after the Work pursuant to
                    this Agreement is completed in a satisfactory manner.
 
               p)   The Contractor, for itself and for its subcontractors,
                    materialmen, mechanics and all persons under it, hereby
                    waives the right to any lien against the ground, structures
                    or any improvements on each Site for Work or labor done or
                    materials furnished pursuant to this Agreement. Contractor
                    agrees to execute a "no-lien" agreement on a form supplied
                    by NEXTEL.


          7.  Where the Contractor owns or manages the selected Sites and NEXTEL
              is required to exercise its rights under Paragraphs 6(o) above,
              the Contractor grants NEXTEL, its employees, contractors,
              subcontractors or agents, the right to enter upon such Sites and
              to perform the necessary work.

          8.  During the term of this Agreement and for two (2) years thereafter
              (the "Restricted Period"), neither the Contractor nor NEXTEL will
              adversely affect the reputation of the other party or of the Owner
              or Lessor of a Site nor disclose information to any entity
              concerning their business affairs. During the Restricted Period,
              the Contractor and NEXTEL also agree not to divert or solicit any
              of the other party's employees on behalf of itself .

          9.  The Contractor shall defend, indemnify, save and hold harmless
              NEXTEL, its parents, subsidiaries, affiliates, their directors,
              officers, agents, and the employees from any and all liabilities,
              claims, or demands (including costs, expenses, and reasonable
              attorney's fees) that may be made by any person, specifically
              including, but not limited to, employees or agents of the
              Contractor, and including but not limited to, employees or agents
              of the Contractor's subcontractors, for injuries, including death
              to persons, or damage to property, including theft, arising out of
              this Agreement, by reason of any act, omission, misconduct,
              negligence or default on the part of the Contractor, any
              subcontractor or any employee of the Contractor or subcontractor;
              and, except, as may otherwise be provided by applicable law, such
              rights to indemnification shall obtain regardless of whether any
              act, omission, misconduct, negligence or default (other than gross
              negligence or willful misconduct) of NEXTEL or its employees
              contributed or may be alleged to have contributed in any way
              thereto. The Contractor shall defend NEXTEL at NEXTEL's request
              against any such liability, claim or demand. The foregoing
              indemnification shall apply whether the Contractor or NEXTEL
              defends such suit or claim 

                                       8
<PAGE>
 
              and shall extend to any costs incurred by NEXTEL to enforce the
              terms of this indemnification. NEXTEL agrees to notify the
              Contractor promptly of any written claims or demands against
              Company for which the Contractor is responsible hereunder.

          10. This Agreement, being one of personal services, may not be
              assigned by the Contractor nor may any obligation of the
              Contractor hereunder be assumed by any other person or third party
              without the prior written consent of NEXTEL.

          11. Any notice or demand required to be given in this Agreement shall
              be made by certified or registered mail, return receipt requested,
              to the address of the other party set forth below:


          Contractor:     CROWN NETWORK SYSTEMS, INC.
                          Penn Center West III
                          Suite 120
                          Pittsburgh, PA  15276
                          Attn:  Robert A. Crown


          NEXTEL:         NEXTEL COMMUNICATIONS, INC.
                          31200 Carter Street
                          Solon, OH  44139

 
          Any such notice or demand is deemed received  three (3) business days
following deposit in the United States Mails addressed as required above.
Contractor or NEXTEL may from time to time designate any other address for this
purpose by giving written notice to the other party.


          12. This Agreement may be executed simultaneously in several
              counterparts, each of which shall be deemed to be an original, but
              all of which shall constitute one and the same instrument.

          13. This Agreement shall be binding upon NEXTEL and the Contractor,
              their respective successors and assigns. Moreover, if any portion
              of this Agreement shall be deemed legally unenforceable, the
              unenforceability of that particular portion, including its
              restrictive covenants, shall not limit the enforceability of that
              particular portion, including its restrictive covenants and shall
              not limit the enforceability of any other provision.

          14. All obligations under this Agreement unless otherwise provided
              herein, shall be for a period of five (5) years from the date of
              this Agreement.

          15. The parties agree that without the express written consent of the
              other party, neither party shall reveal, disclose or promulgate to
              any third party the terms of this Agreement or any portion
              thereof, except to such third party's auditor, accountant or
              attorney or to a 

                                       9
<PAGE>
 
              governmental agency if required by regulation, subpoena or
              government order to do so.

          16. The laws of the Commonwealth of Pennsylvania, disregarding
              conflict of law principles, shall govern this Agreement. Further,
              each party submits to the jurisdiction of any federal or
              commonwealth court sitting in Allegheny County, Pennsylvania.

          Intending to be legally bound hereto, this Agreement is entered into
by the parties as of the day and year written above.


ATTEST:                         CROWN NETWORK SYSTEMS, INC.


/s/  Michael Vernon             /s/  Robert A. Crown
_________________________       _________________________________________
                                Robert A. Crown
                                President


ATTEST:                         POWERFONE, INC.
                                d/b/a NEXTEL COMMUNICATIONS


/s/  Charles D. Devore          /s/  Lou Peltzer
__________________________      ________________________________________
                                By: Lou Peltzer
                                    Vice President -- Ohio Valley

                                      10

<PAGE>
 
                                  EXHIBIT "A"
                                   (1 of 2)

                 SERVICES  TYPICALLY  PROVIDED  BY  CONTRACTOR
                 ---------------------------------------------


CONSTRUCTION BUILD-OUT:
- ---------------------- 


          CROWN will obtain all permits necessary for construction of build-outs
          and antennas installations.

          CROWN will construct the interior building spaces to NEXTEL
          specifications.  This would include:

               a.  Electric service, 200 amp with separate meter;
               b.  Fencing around NEXTEL equipment; and 
               c.  All cable tray layouts.


          CROWN will install antennas and runs of coaxial per Andrew
          specifications for each Site.

          CROWN will color code antennas and coaxial cable.

          CROWN will sweep antennas and coaxial with a Marconi Network Analyzer.

          CROWN will supply NEXTEL with complete documentation of all
          installations and antenna sweeps.


PROJECT MANAGEMENT AND COORDINATION:
- ----------------------------------- 

          Coordinate all engineering layouts and Site selection.

          Document all final site locations.

          Obtain NEXTEL/CROWN building permit approvals.

          Document all build-out locations by Site, by material.

          Coordinate lease execution Site by Site.

          Coordinate and order all material by Site, including types of
          antennas, length of coaxial, room build-out and electrical
          installation.
 
          Schedule all installations (room build-outs, antenna installations).


                                  EXHIBIT "A"
                                    (2 of 2)
<PAGE>
 
          Submit Daily Project Projects by Site, by work type, etc.  For
          example:


               a.  Permitting;
               b.  Construction;
               c.  Antenna Installation;
               d.  Acceptance;
               e.  Documentation.


          Submit project updates as required by NEXTEL management.


          Provide as-built documentation by Site upon completion of the project.
<PAGE>
 
                                  EXHIBIT "B"

                    Fixed Fee for Initial Site Installations
                    ----------------------------------------


          Installation                              Price *
          ------------                              -----  

          Completion of Tenant Improvements,         [*]
          Project Management and Labor to
          Install and Service Antennas


          Material Handling if Antenna and           [*]
          Coaxial System are Purchased by
          NEXTEL

          Cost of Antenna and Coaxial System         [*]
          if Purchased by CROWN                     
                                                    

          * The price for initial Site installations specifically does not
            include the pick-up or delivery by CROWN of NEXTEL fixed network
            equipment or battery plant from NEXTEL's warehouse to individual
            Sites. NEXTEL shall, at NEXTEL's expense, arrange for pick-up and
            delivery of said items to each Site.

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.


<PAGE>
 
                                  EXHIBIT "C"

                          CROWN NETWORK SYSTEMS, INC.
                          ---------------------------
 
     Any additional services performed by Contractor shall be subject to the
following hourly rates:
 
          CLASSIFICATIONS                       RATES
          ---------------                       -----
                                     
          President                              [*]
          Legal                                  [*]
          Vice President                         [*]
          Program Director                       [*]
          Operations Manager                     [*]
          Operations Supervisor                  [*]
          Construction Coordinator               [*]
          Property Site Researcher               [*]
          Project Manager                        [*]
          Draftsman                              [*]
          Tower Rigger                           [*]
          Skilled Laborer                        [*]
          Technician                             [*]
          Office Clerical                        [*]
          Electrician                            [*]
 
    All hourly rates above do not include reasonable travel and lodging
expenses and shall be invoiced by the quarter-hour.
 
          EQUIPMENT                             RATES
          ---------                             -----
 
          580 Backhoe                            [*]
          Equipment Truck/Class 1 (daily)        [*]
          Mileage Charge                         [*]
          Equipment Truck/Class 2 (daily)        [*]
          Mileage Charge                         [*]
          18 Ton Truck Crane                     [*]
          28 Ton Truck Cone                      [*]
          Tractor Trailer with 40 Ton Lowboy     [*]
          Tractor Dump Trailer                   [*]
          Single Axle Dump Truck                 [*]
          977L High Lift                         [*]
          D4 Dozer                               [*]
          Uniloader                              [*]
          Vibratory Roller                       [*]
          Operator Overtime                      [*]
          Quickie Saw (daily)                    [*]
          Tamper (daily)                         [*]
          Chain Saw (daily)                      [*]
 

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.
<PAGE>
 
                                  EXHIBIT "D"

                             INSURANCE REQUIREMENTS
                             ----------------------


     Commercial general liability insurance providing coverage for operations
and for contractual liability with respect to liability assumed by subcontractor
herein. The limits of coverage for such insurance shall not be less than
$1,000,000/$2,000,000 for bodily injury and $ 1,000,000 for property damage.

     Comprehensive automobile liability insurance covering the use and
maintenance of owned, non-owned, hired and rented vehicles with limits of
coverage of not less than a combined single limit of $500,000 or not less than
$250,000 per person and $500,000 per occurrence for bodily injury and not less
than $300,000 per occurrence for property damage.

     Workers' Compensation insurance with statutory limits of coverage.

     Excess liability insurance in the umbrella form with a combined single
limit of $5,000,000.

     NEXTEL shall be named as an additional insured on all such policies. All
insurance policies provided hereunder shall be endorsed to provide NEXTEL with
thirty (30) days notice of cancellation and/or restriction. If the initial
insurance policies required by this Agreement expire prior to the completion of
the Work, renewal certificates of insurance of policy shall be furnished thirty
(30) days prior to the date of their expiration.



<PAGE>
 
                                                                   EXHIBIT 10.13

                        INDEPENDENT CONTRACTOR AGREEMENT
- --------------------------------------------------------------------------------
              WITH CONFIDENTIALITY AND NON-COMPETITION AGREEMENTS



     THIS AGREEMENT is entered into as of this 3rd day of December 1996 between
Crown Network Systems, Inc. a Pennsylvania corporation ("Contractor"), with an
office at Penn Center West III, Suite 229, Pittsburgh, Pennsylvania 15276, and
APT Pittsburgh Limited Partnership ("APT"), with an office at 801 Commonwealth
Drive, Warrendale, Pennsylvania 15086.

     WHEREAS, the Contractor has been approved to perform construction services
for APT on selected communications sites (each of which is referred to herein as
a "Site") in the Pittsburgh Metropolitan Trading Area.

     NOW, THEREFORE, in consideration of the mutual covenants and promises set
forth herein, the parties hereto, intending to be legally bound hereby, agree as
follows:

     1.  The Contractor shall perform all the work set forth in the Scope of
Work ("Work"), pursuant to the specifications and terms and conditions set forth
therein or which may reasonably be implied therefrom. All of the services set
forth in Exhibit "B" attached hereto and all materials, supplies, services,
equipment, technical specifications and other items set forth in the Notice to
Proceed (as defined in Paragraph 3 hereof), are included in the Work. Technical
specifications and 
<PAGE>
 
a Construction Services Fee will be negotiated independently for each selected
Site and incorporated into the Notice to Proceed. The Construction Services Fee
will be a "firm fixed price" for the services described in the Construction
Services section of Exhibit "B" and those services set forth in the Notice to
Proceed ("Construction Services Fee").

     2. Following the full execution of a Site Lease Acknowledgment ("SLA"), the
Contractor shall send its invoice to APT requesting payment of a Lump Sum Price
for such Site. Payment of the Lump Sum Price by APT shall be due within thirty
(30) days from receipt of the Contractor's invoice. The Lump Sum Price for each
selected Site shall be comprised of a Construction Management Fee of [*], and a
Warehousing and Material Handling Fee of [*] for the services described in the
Construction Management and Warehousing and Material Handling sections of
Exhibit "B" ("Lump Sum Price").

     3. The Contractor shall prepare and deliver to APT, together with a signed
SLA, a firm fixed price proposal, a bill of materials, a description of the Work
and technical specifications. Upon agreement as to the price and terms of the
foregoing, APT shall issue to the Contractor a written notice confirming the
price and terms agreed upon and fixing the date on 

                                       2

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
which the Contractor shall commence performance of its obligations under this
Agreement ("Notice to Proceed"). The Contractor shall commence the Work,
pursuant to this Agreement, on each Site promptly upon the commencement date set
forth in the Notice to Proceed and shall prosecute the Work on each Site
diligently to completion. The Contractor will use its best efforts to complete
the Work required pursuant to the Notice to Proceed within thirty (30) calendar
days of the commencement date set forth in the Notice to Proceed; provided,
however, that the Contractor shall not be obligated to complete more than 16
Sites in any thirty (30) calendar day period. If more than 16 Notices to Proceed
are concurrently outstanding, the Contractor will have an additional three (3)
days to complete each Site above the 16 Site minimum. For example, if 17 Notices
to Proceed are outstanding, the last Site will be completed within thirty-three
(33) calendar days of the commencement date set forth in its Notice to Proceed.
If 18 Notices to Proceed are outstanding, the first 16 must be completed within
thirty (30) days, the 17th within thirty-three (33) days of the commencement
date set forth in its Notice to Proceed and the 18th within thirty-six (36) days
of the commencement date set forth in its Notice to Proceed. At such time as the
outstanding Notices to Proceed fall below 16, the thirty day completion
requirement will resume for any Notices to Proceed thereafter issued. The
Contractor shall not perform 

                                       3
<PAGE>
 
any of the Work or make any financial commitments until receiving the Notice to
Proceed. The performance of any portion of the Work or preparation to perform
any of the Work by the Contractor, prior to receiving the Notice to Proceed,
shall be done at the Contractor's sole risk.

     4. Upon completion of the entire Work at each Site by the Contractor in
accordance with the provisions of this Agreement, the Contractor shall request,
in writing, final inspection of the Work. APT will inspect the Work within five
(5) calendar days of the Contractor's written request. Within five (5) calendar
days of the inspection, APT will either provide a signed writing evidencing
final acceptance of the Work, or, through the use of a punch list form, advise
the Contractor of the portions of the Work that it believes to be defective or
incomplete and advise the Contractor of any obligations required for final
acceptance that have not been fulfilled. The Contractor shall complete the punch
list items as agreed upon by the parties and as necessary to install and operate
APT's equipment within ten (10) working days following issuance of the punch
list. In no event shall completion by the Contractor of all unfinished or
defective portions of the Work exceed thirty (30) calendar days following
issuance of the punch list. After final acceptance of the Work, APT shall pay
the Contractor the appropriate 

                                       4
<PAGE>
 
Construction Services Fee within thirty (30) days from the date of receipt of
the Contractor's invoice; however, Contractor's invoice shall not be sent to APT
until such time as a Site becomes operational, subject to a ten percent (10%)
retainage by APT to assure completion of the punch list items. Final payment
shall be made within fifteen (15) days after APT's final acceptance of the Work.
Payment shall not operate to release the Contractor from its obligations under
this Agreement.

     5. APT will, from time to time, provide the Contractor with a list of
materials and equipment which APT will supply ("List"). The Contractor will use
the materials and equipment supplied by APT and will not substitute any of the
same without APT's prior written consent. Materials and equipment supplied by
APT shall be inspected, approved and accepted by the Contractor and become part
of the Work of this Agreement. If materials or equipment are required which are
not on the List, the Contractor may supply such materials or equipment itself or
obtain them from independent parties. The cost of any materials, equipment or
labor furnished by the Contractor shall be based on the Contractor's published
rates as set forth on Exhibit "C" attached hereto. The Contractor shall identify
the cost to APT of any materials, equipment or labor which it desires to obtain
from an independent party, together with the manufacturer of such 

                                       5
<PAGE>
 
materials in its proposal for the Construction Services Fee. The Contractor
shall submit an itemized accounting and supporting data which substantiates all
costs and expenses associated with materials, equipment or labor procured from
independent parties.

     6. Notwithstanding any other provision contained in the Work or any other
document exchanged by the parties, the following terms and conditions shall
apply with respect to this Agreement and the materials, equipment and services
provided hereunder:

     a)   The Contractor, its agents, subcontractors, and employees shall
          perform the Work as independent contractors, and not as agents,
          partners, joint venturers or employees of APT. The Contractor shall
          supervise and direct the Work, using the care and skill ordinarily
          used by members of the Contractor's profession practicing under
          similar conditions at the same time and in the same geographic area,
          and the Contractor shall be solely responsible for all construction
          means, methods, techniques, sequences and procedures and for
          coordinating all portions of the Work.

                                       6
<PAGE>
 
     b)   Unless otherwise specifically provided in the Work, the Contractor
          shall provide and pay for all labor, supervision, materials,
          construction surveys and layout, equipment, tools, construction
          equipment and machinery, water, heat, utilities, transportation, and
          other facilities and services necessary for the proper execution and
          completion of the Work, whether temporary or permanent, and whether or
          not incorporated or to be incorporated in the Work, and any other
          items incidental to the execution of the Work, all as indicated or
          which may reasonably be implied from the Work.

     c)   The Contractor shall at all times enforce strict discipline and good
          order among its employees and shall not employ on the Work any unfit
          person or anyone not skilled in the task assigned to such person.

     d)   The Contractor hereby represents and warrants to APT that all
          materials and equipment incorporated in the Work will be new unless
          otherwise requested in writing by the Contractor and agreed to in
          writing by APT prior to their use. All such materials and equipment
          shall be subject to inspection and approval by APT, The 

                                       7
<PAGE>
 
          Contractor further represents and warrants that the Work to be
          performed under this Agreement, and all workmanship, materials and
          equipment provided, furnished, used or installed in construction of
          the same, shall be safe, substantial and durable construction in all
          respects, and that all of the Work will be free from faults and
          defects and in conformance with the terms of the Work. All of the
          Work, including all materials and equipment, not conforming to these
          requirements may be considered defective by APT. This warranty for
          each Site shall be for a period of twelve (12) months from the date of
          final acceptance of the Work on each Site by APT ("Warranty Period").
          Nothing herein shall limit APT's right to seek recovery for latent
          defects which are not observable until after the Warranty Period has
          expired. The warranty provided herein shall be in addition to and not
          in limitation of any other warranty or remedy required by law or this
          Agreement. The Contractor will be responsible to make sure that all
          third-party warranties flow through to APT and will enforce all such
          warranties for the benefit of APT.

          The Contractor agrees to correct any defective portion 

                                       8
<PAGE>
 
          of the Work, including materials and equipment, upon request and to
          the reasonable satisfaction of APT during the Warranty Period at no
          charge to APT; provided, however, that materials supplied by APT which
          are installed and tested by the Contractor and accepted by APT and are
          thereafter found to be defective shall be replaced by the Contractor
          at the expense of APT in accordance with the Contractor's published
          rates as set forth on Exhibit "C.". If the Contractor fails, after ten
          (10) business days following notice from APT, to: (i) commence and
          continue correction of defective Work with diligence and promptness;
          (ii) perform the Work; or (iii) comply with any material provision of
          this Agreement, APT may correct and remedy any such deficiency. In
          connection with such corrective and remedial action, APT may take
          possession of and incorporate in the Work all materials and equipment
          paid for by APT which either are stored at the Site or are stored
          elsewhere. The Contractor shall allow APT, its agents, representatives
          and employees, access to the Site to enable APT to exercise the rights
          and remedies as stated hereunder. All claims, costs, losses and
          damages incurred or sustained by APT in exercising such rights and
          remedies will be charged against the 

                                       9
<PAGE>
 
          Contractor and may be deducted from monies due or to become due to the
          Contractor; and APT shall be entitled to an appropriate decrease in
          the Construction Services Fee or any other remedy permitted in this
          Agreement or allowed by law. Such claims, costs, losses and damages
          will include, but not be limited to, all costs of repair or
          replacement for work of others destroyed or damaged by correction,
          removal or replacement of the Contractor's defective work. The
          Contractor shall not be responsible for reasonable delays caused by
          inclement weather which typically delays a reasonable contractor's
          performance of work substantially similar to the Work set forth herein
          or other circumstances beyond its control.

     e)   The Contractor shall give all notices and comply with all laws,
          ordinances, rules, regulations, and lawful orders of any public
          authority bearing on the performance of the Work (collectively, "Laws
          and Regulations"), and shall promptly notify APT if the terms of the
          Work are at variance therewith.

          Unless otherwise set forth herein, the Contractor shall obtain, at its
          expense, all necessary local and 

                                       10
<PAGE>
 
          municipal permits, licenses, inspections, certificates and approvals
          of the Work and shall ensure compliance with all state environmental
          laws and shall furnish utilities it may require to perform the Work.
          APT shall pay all fees for such permits, licenses, inspections,
          certificates or approvals to the appropriate government body or other
          entity.

          The Contractor shall at all times itself observe and comply with, and
          cause all its agents and employees to observe and comply with, all
          such existing and future Laws and Regulations; and shall protect and
          indemnify APT, its officers and agents, against any claims or
          liability arising from or based upon violation of such Laws and
          Regulations, whether by itself or its agents or employees.

     f)   The Contractor at all times shall keep the Site free from accumulation
          of waste materials or rubbish caused by its operations. At the
          completion of the Work, the Contractor shall remove all its waste
          materials and rubbish from and about the project as well as its tools,
          construction equipment, machinery and surplus materials. If the
          Contractor fails to clean up as 

                                       11
<PAGE>
 
          provided pursuant to this Agreement, APT may do so and the reasonable
          cost thereof shall be charged to the Contractor and may be deducted
          from monies due or to become due to the Contractor.

     g)   The Contractor shall protect, maintain and secure the Work during
          construction and until final acceptance of the Work. This protection,
          maintenance and security shall be continuous so that the Work is
          protected, maintained and secured in satisfactory condition at all
          times. All costs of protection, maintenance and security before final
          acceptance of the Work shall be part of the Construction Services Fee.
          Should the Contractor at any time fail to so protect, maintain and
          secure the Work, APT, upon observing such failure, shall notify the
          Contractor of such non-compliance and the Contractor shall remedy such
          unsatisfactory condition within three (3) business days. If the
          Contractor fails to remedy such condition, APT may correct such
          unsatisfactory condition. All reasonable protection, maintenance or
          security costs incurred by APT shall be charged to the Contractor and
          may be deducted from monies due or to become due to the Contractor.

                                       12
<PAGE>
 
     h)   The Contractor shall acquire through assignment, purchase, license, or
          other means, all rights required to fully utilize all technology,
          know-how, trade secrets, inventions, processes, articles, procedures,
          equipment, apparatus, devices, or any other part thereof, and any and
          all things or matters that are to be used to perform the Work under
          this Agreement.

          If a temporary, preliminary or permanent injunction is secured because
          of an alleged patent or proprietary rights infringement, which
          prevents APT from using the process, materials or equipment furnished,
          utilized or installed, the Contractor, at its expense, shall within
          thirty (30) calendar days following notification thereof either: (i)
          procure the right for APT to continue using the same process,
          materials or equipment; or (ii) modify the process, materials or
          equipment, or provide a replacement process, materials or equipment
          which is non-infringing, and is reasonably satisfactory to APT. The
          Contractor shall defend all suits or claims for infringement of any
          patent or proprietary rights and shall save APT harmless from loss on
          account thereof. The obligations of the Contractor under this
          paragraph shall survive the 

                                       13
<PAGE>
 
          termination or expiration of this Agreement.

     i)   APT reserves the right to conduct, at its expense, any test or
          inspection it may deem advisable to assure that construction, supplies
          and services conform to the provisions of this Agreement, including
          the Work. Any tests performed by the Contractor may be witnessed by
          representatives of APT. It shall be the responsibility of the
          Contractor to assure that such tests are performed and to submit the
          written test reports, results and certificates to APT, summarizing the
          results of all tests and indicating satisfactory completion of all
          required tests. All such reports, results and certificates shall be
          submitted prior to final acceptance of the Work. Additional
          information concerning testing requirements may be contained in the
          Work.

     j)   The Contractor shall take reasonable safety precautions with respect
          to performance of this Agreement, shall comply with all safety
          measures initiated by APT and all applicable laws, ordinances, rules,
          regulations and orders of public authorities for the safety of persons
          or property. The Contractor shall report to APT within 

                                       14
<PAGE>
 
          three (3) calendar days any injury to an employee or agent of the
          Contractor which occurred at a Site.

          If hazardous substances of a type for which an employer is required by
          law to notify its employees are being used on a Site by the
          Contractor, its subcontractors or anyone directly or indirectly
          employed by them, the Contractor shall, prior to exposure of any
          employees on a Site to such substance, give written notice of the
          chemical composition thereof to APT, any subcontractors or other
          employers on such Site, in sufficient detail and time to permit
          compliance with such laws by APT, other subcontractors and other
          employers on such Site.

          In the event that the Contractor encounters on the Site material
          reasonably believed to be asbestos or polychlorinated biphenyl
          ("PCB"), which has not been rendered harmless, the Contractor shall
          immediately stop Work in the area affected and report the condition to
          APT in writing. The Work in the affected area shall resume in the
          absence of asbestos or PCB, or when it has been rendered harmless.

     k)   The Contractor may be ordered in writing by APT without 

                                       15
<PAGE>
 
          invalidating this Agreement, to make changes in the Work within the
          general scope of this Agreement consisting of additions, deletions or
          other revisions, the Construction Services Fee and time for completion
          being adjusted accordingly. The Contractor, prior to the commencement
          of such changed or revised portion of the Work, shall submit promptly
          to APT written copies of a claim for adjustment to the Construction
          Services Fee, and time for completion for such revised Work in a
          manner consistent with requirements of this Agreement. The Contractor
          may request a change in the Work by providing APT with a written
          request describing the change. If such change is acceptable to APT,
          APT shall provide a written change order to the Contractor as set
          forth above. APT shall have five (5) working days to either provide
          the Contractor with the requested change order or provide written
          notice that the request is denied. If APT fails to provide such notice
          within the five (5) business day period, the requested change order
          will be deemed to have been accepted by APT. The Contractor shall not
          perform any change in the Work, including additions, deletions or
          other revisions, without prior written authorization from APT.

                                       16
<PAGE>
 
     l)   To the fullest extent permitted by law, the Contractor shall defend,
          indemnify and hold harmless APT and its agents and employees from and
          against all liability, claims, damages, losses and expenses of
          whatever nature, including, but not limited to reasonable attorneys'
          fees arising out of or resulting from the performance of the Work,
          provided that any such liability, claim, damage, loss or expense is
          caused in whole or in part by any negligent act or omission or act of
          willful misconduct of the Contractor, any subcontractor, anyone
          directly or indirectly employed by any of them or anyone for whose
          acts any of them may be liable, regardless of whether or not it is
          caused in part by a party indemnified hereunder. Such obligation shall
          not be construed to negate, abridge or otherwise reduce any other
          right against any party or person described in this paragraph. The
          above obligations shall survive the termination or expiration of this
          Agreement.

     m)   The Contractor shall purchase and maintain insurance for protection
          from claims under Workers' Compensation and other employee benefit
          acts, claims for damages because of bodily injury, including personal
          injury, 

                                       17
<PAGE>
 
          sickness or disease or death. The Contractor shall also purchase and
          maintain insurance for protection from claims or damages to property,
          including loss of use resulting therefrom, which may arise out of or
          result from the Contractor's operations under this Agreement, whether
          such operations be by the Contractor, its employees and agents, or any
          subcontractor and its agents and employees or anyone directly or
          indirectly employed by any of them. The insurance shall be written by
          companies and with limits and coverage acceptable to APT in accordance
          with Exhibit "A" attached hereto. The limits specified shall not act
          to limit the liability of the Contractor or the indemnification
          obligation of the Contractor. The Contractor and its subcontractors
          shall require their insurance carriers, with respect to all insurance
          policies, to waive all rights of subrogation against APT. Certificates
          of such insurance shall be filed with APT prior to commencement of the
          Work, with such certificates indicating thirty (30) days notification
          in writing to APT if material change or cancellation takes place. The
          certificates shall also indicate that APT shall be named as additional
          insured with respect to the operations of the Contractor in accordance
          with the Construction

                                       18
<PAGE>
 
          Agreement. Copies of the entire insurance policies will be provided
          upon request.

     n)   If the Contractor persistently or repeatedly fails or neglects to
          carry out the Work at a Site in accordance with this Agreement, or
          persistently or repeatedly fails to observe the safety rules and other
          rules and regulations governing performance of the Work at a Site, and
          fails within one (1) business day after receipt of written notice to
          commence and continue correction of such default or neglect with
          diligence and promptness, APT may, without prejudice to any other
          remedy that APT may have, terminate the Contractor and finish the
          Contractor's Work at a Site by whatever method APT may deem expedient.
          If the expense of finishing the Contractor's Work at a Site exceeds
          the value of the Construction Services Fee, the Contractor shall pay
          the difference to APT. The Contractor shall not be responsible for
          delays caused by inclement weather or other circumstances beyond its
          control which typically delays a reasonable contractor's performance
          of work substantially similar to the Work set forth herein.

                                       19
<PAGE>
 
          To the extent the Contractor is terminated at a Site, the Contractor
          shall immediately take all steps to protect the subcontracts for
          labor, materials, equipment or services with respect to the
          termination. APT may in such case withhold payment to the Contractor
          until after the Work pursuant to this Agreement is completed in a
          satisfactory manner.

     o)   The Contractor understands that APT may remove the Contractor and/or
          suspend performance of the Work upon request of the owner ("Owner") or
          lessor ("Lessor") of the Site where the Work is to be performed if the
          Owner or Lessor reasonably believes that the Contractor is performing
          the Work in a manner which creates a serious risk of harm to others.

     p)   The Contractor agrees to be bound by all of the provisions of any
          contract between APT and the Owner or Lessor insofar as they apply to
          the Work to be performed under this Agreement. The Contractor
          acknowledges receipt of a copy of any such contract prior to
          commencement of the Work.

     q)   The Contractor, for itself and for its subcontractors, 

                                       20
<PAGE>
 
          materialmen, mechanics and all persons under it, hereby waives the
          right to any lien against the ground, structures or any improvements
          on each Site for Work or labor done or materials furnished pursuant to
          this Agreement. If requested by APT, the Contractor agrees to execute
          a "no-lien" agreement on a form supplied by APT.

          7. Where the Contractor owns or manages the selected Sites and APT is
required to exercise its rights under Paragraphs 6(d), (n) or (o) above, the
Contractor grants APT, its employees, contractors, subcontractors or agents, the
right to enter upon such Sites and to perform the necessary work.

          8. APT intends to protect its proprietary information, together with
proprietary information, in appropriate cases, of the Owner or Lessor, which may
be disclosed during business transactions with the Contractor. APT and the Owner
or Lessor have devoted substantial time and expense in the field of wireless
communications and, in doing so, have acquired proprietary information which
they desire to remain confidential in order to promote their corporate growth
and security. The business relationship between and among APT, the Owner or
Lessor, and the Contractor will entail the possible disclosure of certain

                                       21
<PAGE>
 
proprietary information to one another, including, among other things,
information regarding each parties' respective assets, liabilities, operations,
financial conditions, employees, plans, prospects, management, investors,
products, strategies and techniques, the technical characteristics and
operations of each party's products, and the identity of suppliers and customers
and the nature and extent of their business relationships with such party.
Therefore, APT and the Contractor agree to the following conditions:

     a)   All proprietary information of APT and of the Owner or Lessor will be
          treated with the strictest confidence. Contractor will not disclose
          proprietary information to any third party and will not make use of
          that proprietary information, except for such information necessary to
          transact business between APT and the Contractor. The Contractor shall
          not provide proprietary information to individuals not significantly
          involved in the proposed transaction.

     b)   The Contractor shall not develop any new techniques or ideas relating
          to APT's proprietary information or that of the Owner or Lessor that
          would have a negative impact on their competitiveness.

                                       22
<PAGE>
 
For purposes of this Paragraph 8, APT's RF design criteria and search areas are
deemed to be proprietary.  "Proprietary information" shall not be deemed to
include any information available in the marketplace or disclosed to Contractor
independently by a third party.

          9. During the term of this Agreement and for two (2) years thereafter
("Restricted Period"), neither the Contractor nor APT will take any action to
adversely affect the reputation of the other party or of the Owner or Lessor of
a Site.  During the Restricted Period, the Contractor and APT also agree not to
divert or solicit any of the other party's employees on behalf of itself or a
related company.

          10.  Because money damages would not be a sufficient remedy for a
breach of the restrictive covenants contained in this Agreement, an aggrieved
party shall be entitled to obtain injunctive relief in addition to monetary
damages if a breach were to occur of the provisions of Paragraphs 8 or 9 of this
Agreement.

          11. The Contractor shall defend, indemnify, save and hold harmless
APT, its parents, subsidiaries, affiliates, their directors, officers, agents,
and their employees from any and all 

                                       23
<PAGE>
 
liabilities, claims, or demands (including costs, expenses, and reasonable
attorney's fees) that may be made by any person for injuries, including death to
persons, or damage to property, including theft, arising out of this Agreement,
by reason of any act, omission, misconduct, negligence or default on the part of
the Contractor, any subcontractor or any employee of the Contractor or
subcontractor. The Contractor shall defend APT at APT's request against any such
liability, claim or demand. The foregoing indemnification shall apply whether
the Contractor or APT defends such suit or claim and shall extend to any costs
incurred by APT to enforce the terms of this indemnification. APT agrees to
notify the Contractor promptly of any written claims or demands against APT for
which the Contractor is responsible hereunder. The Contractor shall have the
right to defend any claim asserted under this provision with counsel of its
choice and to control any litigation arising hereunder, except that no
settlement may be made without the prior written approval of APT. APT shall be
provided with regular status reports by the Contractor.

          12. If the Contractor causes damage to the work or property of any
separate vendor on the Site, the Contractor shall, upon due notice, resolve such
issues with such separate vendor without liability to APT. If the vendor sues
APT on 

                                       24
<PAGE>
 
account of any damage alleged to have been so sustained, APT shall notify
the Contractor of such proceedings. The Contractor shall indemnify and hold APT
harmless from and pay or satisfy any judgment which may be entered against APT
in any such proceedings. The Contractor shall reimburse APT for any and all
reasonable attorney's fees and court costs which APT may incur incident to the
defense of the claim, whether or not the claim is defended by APT or the
Contractor.

          13. It is mutually agreed that any controversies, disputes or claims
of any nature arising out of or relating to this Agreement, or the breach
thereof, may, at the discretion of either party to this Agreement, be settled by
arbitration in accordance with the then current Construction Industry
Arbitration Rules of the American Arbitration Association (in the Pittsburgh,
Pennsylvania office only) and that all findings and decisions by the arbitrators
shall be conclusive and binding on both parties and shall not be appealable.
Judgment upon the award rendered by the arbitration panel may be entered in the
Court of Common Pleas of Allegheny County. Nothing in this section of this
Agreement's provisions shall create any claim, right or cause of action in the
favor of the subcontractor against APT.

                                       25
<PAGE>
 
          If so determined by the arbitrators, and to the extent so determined
by the arbitrators, the fees, costs and expenses of the arbitration shall be
borne by the party against whom the arbitration is determined.

          The Contractor shall proceed with the Work under this Agreement during
any claims, disputes, questions or related matters or proceedings unless
otherwise agreed to by the Contractor and APT in writing. If the Contractor is
proceeding with the Work or any portion thereof, under protest, the Contractor
must notify APT in writing prior to commencing of the Work or any such portion.

          APT and the Contractor agree that they shall not make any claim
against any officer, agent, or employee of the other party to this Agreement
for, or on account of, any act or omission to act in connection with this
Agreement, except for acts of willful misconduct and/or gross negligence, and
the parties hereby waive any and all rights to make any such claim or claims.

          Notwithstanding the foregoing, the rights to injunctive relief set
forth in Paragraph 10 hereof, may be heard only by the state or federal courts
located in Allegheny County, 

                                       26
<PAGE>
 
Pennsylvania.

          14. This Agreement, being one of personal services, may not be
assigned by the Contractor nor may any obligation of the Contractor hereunder be
assumed by any other person or third party without the prior written consent of
APT.

          15. Any notice or demand required to be given in this Agreement shall
be made by certified or registered mail, return receipt requested, or reliable
overnight courier to the address of other parties set forth below:

                                       27
<PAGE>
 
Contractor:         Crown Network Systems, Inc.
                    Penn Center West III, Suite 229
                    Pittsburgh, PA 15276

                    Attn: Robert A. Crown, President

APT:                APT Pittsburgh Limited Partnership
                    801 Commonwealth Drive
                    Warrendale, PA 15086

                    Attn: Director of Engineering and Operations

With a Copy To:     American Portable Telecom
                    Real Estate Department
                    P.O. Box 31793
                    Chicago, IL 60631-0793

Any such notice is deemed received one (1) business day following deposit with a
reliable overnight courier or three (3) business days following deposit in the
United States mails addressed as required above. Contractor or APT may from time
to time designate any other address for this purpose by written notice to the
other party.

          16. This Agreement may be executed simultaneously in several
counterparts, each of which shall be deemed to be an original, but all of which
shall constitute one and the same instrument.

          17. This Agreement shall be binding upon APT and the Contractor, their
respective successors and assigns. Moreover, if any portion of this Agreement
shall be deemed legally unenforceable, the unenforceability of that particular
portion, 

                                       28
<PAGE>
 
including its restrictive covenants, shall not limit the enforceability of any
other provision.

          18. Neither party shall disclose the terms of this Agreement to an
unaffiliated third party (other than attorneys, accountants, or lenders, or as
part of financial statements or to a prospective purchaser of all or
substantially all of the business or assets of the disclosing party) unless such
terms are or become publicly available (other than through unauthorized
disclosure by the parties), as required by law to be disclosed, or with the
prior written consent of the nondisclosing party.

          19. Time is of the essence of this Agreement; it being understood,
however, that if the Contractor is delayed in the progress of the Work by
changes ordered in the Work, by labor disputes, fire, unusual delay in
deliveries of materials, or unavoidable casualties the time for performance
shall be extended for the period of such delay.

          20. The laws of the Commonwealth of Pennsylvania, disregarding
conflict of law principles, shall govern this Agreement. Further, each party
submits to the jurisdiction of any federal or commonwealth court sitting in
Allegheny County, Pennsylvania.

                                       29
<PAGE>
 
          21.  The provisions of that certain Master Lease Agreement executed by
APT and by Robert Crown d/b/a Crown Communications of even date herewith are
incorporated herein by reference as though set forth in their entirety.

Intending to be legally bound hereto, this Agreement is entered into by the
parties as of the day and year written above.


CROWN NETWORK SYSTEMS, INC.         ATTEST OR WITNESS:


By: /s/  Robert A. Crown
   ------------------------------   -------------------------------
Robert A. Crown, President


                                    -------------------------------
                                    Print Name


APT PITTSBURGH LIMITED              ATTEST OR WITNESS:
PARTNERSHIP


By: [Illegible signature]
   ------------------------------   -------------------------------


                                    -------------------------------
                                    Print Name


                                       30

<PAGE>
 
                                  EXHIBIT "A"
                                  ---------- 
                             INSURANCE REQUIREMENTS



Commercial general liability insurance providing coverage for operations and for
contractual liability with respect to liability assumed by Contractor herein.
The limits of coverage for such insurance shall not be less than
$1,000,000/$2,000,000 for bodily injury and $ 1,000,000 for property damage, or
$2,000,000.00 combined single limit.

Comprehensive automobile liability insurance covering the use and maintenance of
owned, non-owned, hired and rented vehicles with limits of coverage of not less
than a combined single limit of $500,000 or not less than $250,000 per person
and $500,000 per occurrence for bodily injury and not less than $300,000 per
occurrence for property damage.

Workers' Compensation insurance with statutory limits of coverage.

Excess liability insurance in the umbrella form with a combined single limit of
$5,000,000.

The insurance carriers and the form of the insurance policies shall be subject
to approval by APT, which approval shall not be unreasonably withheld or
delayed. APT shall be named as an additional insured on all such policies except
worker's compensation insurance.  All insurance policies provided hereunder
shall be endorsed to provide APT with thirty (30) days' notice of cancellation
and/or restriction. If the initial insurance policies required by this Agreement
expire prior to the completion of the Work, renewal certificates of insurance of
policy shall be furnished thirty (30) days prior to the date of their
expiration. The Contractor shall furnish to APT certificates of such insurance
issued by the insuring carrier in a form satisfactory to APT within ten (10)
days of the execution of this Agreement but in any case, prior to commencement
of the Work, and thereafter upon written request of APT. The fulfillment of such
obligations, however, shall not otherwise relieve the Contractor of any
liability assumed by the Contractor hereunder or in any way modify the
Contractor's obligations to indemnify APT.

                                       31
<PAGE>
 
                                  EXHIBIT "B "
                                  ----------- 

CONSTRUCTION MANAGEMENT
- -----------------------

SITE ASSESSMENT

- -    Site walk and development of Site plan with APT Construction

- -    Frequency and capability study

- -    Space planning in buildings

- -    Provide tower drawings and specifications supplied by the manufacturer in
     order to assist APT in determining whether a Site will support APT's
     communications facilities

SITE PLAN/SITE SURVEY/CONSTRUCTION DOCUMENTATION

- -    Provide copies of existing Site plan as prepared by a land surveyor for
     each Site

- -    Provide CAD drawings of Site design including as-built drawings defining
     antenna layout, equipment layout, AC and Telco interconnect locations and
     Site grounding

- -    Provide copies of existing tower design and manufacturer's structural
     capabilities

MANAGEMENT SERVICES

- -    Develop a scope of work for each Site

- -    Develop a materials list for each Site including but not limited to
     antennas, coaxial cable, connectors, mounting brackets, wave guide, cable
     ladder, grounding kits, cable ports, weather proofing kits and jumpers

- -    Manage the Building Permit process to include preparation of documents,
     meetings with permit officials to develop a complete permit package, filing
     the permit. Permit fees will be paid by APT

- -    Manage all Site construction activities including but not limited to,
     subcontractors' schedules, coordination of deliveries, on-site management,
     ordering and installation of AC power and Telco

- -    Final Site walk-down with APT to develop a "Punch list" and 

                                       32
<PAGE>
 
     completion of the "Punch list" activities

- -    Make the Site available for equipment installation and assure that
     installers maintain approved Site standards


WAREHOUSING AND MATERIAL HANDLING
- ---------------------------------

- -    Order third party materials from APT approved vendors with no additional
     markup, including but not limited to, coaxial cable, connectors, grounding
     kits, antennas, jumpers and mounting brackets

- -    Store materials at Contractor's warehouse

- -    Manage material distribution from Contractor's warehouse to each Site

- -    Asset management to assure proper use, storage and tracking and security
     of APT materials

CONSTRUCTION SERVICES
- ---------------------

All construction is to be performed in strict compliance with standards,
specifications and drawings approved by APT and will include but not be limited
to:

- -    Preparation for and installation of ground pad and/or mounting brackets
     for PCS Base Station equipment

- -    Installation of PCS antennas and supporting brackets and mounts

- -    Preparation and installation of coaxial cables, connectors, waterproof
     connector covers, grounding kits and accessories between the Base Station
     equipment and the antennas

- -    Preparation and installation of disaster prevention grounding system to
     include the grounding ring and equipment grounds

- -    Other mutually agreed upon miscellaneous constructions tasks as may be
     reasonably requested from time to time by APT

                                       33
<PAGE>
 
                                  EXHIBIT "C"
                          CROWN NETWORK SYSTEMS, INC.



Any additional services performed by Contractor shall be subject to the
following hourly rates:
 
     CLASSIFICATIONS                     RATES
     ---------------                     -----

     President                             [*]
     Legal                                 [*]
     Vice President                        [*]
     Program Director                      [*]
     Operations Manager                    [*]
     Operations Supervisor                 [*]
     Construction Coordinator              [*]
     Property Site Researcher              [*]
     Project Manager                       [*]
     Draftsman                             [*]
*    Tower Rigger                          [*]
*    Skilled Laborer                       [*]
*    Technician                            [*]
     Omce Clerical                         [*]
*    Electrician                           [*]

All hourly rates above do not include reasonable travel and lodging expenses and
shall be invoiced by the quarter-hour.

    EQUIPMENT                             RATES
    ---------                             -----
 
    580 Backhoe                            [*]
    Equipment Truck/Class 1 (daily)        [*]
       Mileage Charge                      [*]
    Equipment Truck/Class 2 (daily)        [*]
       Mileage Charge                      [*]
    18 Ton Truck Crane                     [*]
    28 Ton Truck Crane                     [*]
    Tractor Trailer with 40 Ton Lowboy     [*]
    Tractor Dump Trailer                   [*]
    Single Axle Dump Truck                 [*]
    977L High Lift                         [*]
    D4 Dozer                               [*]
    Uniloader                              [*]
    Vibratory Roller                       [*]
    Operator Overtime                      [*]
    Quickie Saw (daily)                    [*]

                                       34
[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.


<PAGE>
 
Tamper (daily)                      [*]
Chain Saw (daily)                   [*]
Portable Generator (daily)          [*]

* Only those Classifications with asterisks are includable as costs in the
Contractor's proposal for the Construction Services Fee.

                                       35

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.


<PAGE>
                                                                   EXHIBIT 10.14

                            MASTER LEASE AGREEMENT

                                    Between

                             SPRINT SPECTRUM, L.P.

                                      and

                             CROWN COMMUNICATIONS

                                 June 11, 1996
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE>
<S>                                                                                                           <C>
1. MASTER LEASE AGREEMENT...................................................................................   1
                                                                                                               
2. SITE LEASE...............................................................................................   1
                                                                                                               
2.1. LEASES OF SITES........................................................................................   1
2.2. MINIMUM NUMBER OF SITES................................................................................   2
2.3. USE OF LESSOR'S SITES..................................................................................   2
                                                                                                               
3. USE......................................................................................................   2
4. TERM.....................................................................................................   3
5. TERMINATION..............................................................................................   3

5.1. BY LESSOR..............................................................................................   3
5.2. BY LESSEE..............................................................................................   3
                                                                                                               
6. FEES.....................................................................................................   4
                                                                                                               
6.1. FEE....................................................................................................   4
6.2. ADJUSTMENT.............................................................................................   4
6.3. INTEREST...............................................................................................   6
6.4. LATE FEE...............................................................................................   6
6.5. OTHER AMOUNTS..........................................................................................   6
                                                                                                               
6.6  HUB SITE SPACES........................................................................................   6
                                                                                                               
7. IMPROVEMENTS AND CONSTRUCTION............................................................................   6
                                                                                                               
7.1. APPROVED COMMUNICATIONS FACILITY.......................................................................   6
7.2. LIENS..................................................................................................   7
7.3. POSSESSION.............................................................................................   7
                                                                                                               
8. UTILITIES................................................................................................   8
                                                                                                               
9. ACCESS...................................................................................................   8
                                                                                                               
9.1 CONSTRUCTION............................................................................................   8
                                                                                                               
9.2 EMERGENCY...............................................................................................   8
                                                                                                               
9.3 TYPE OF ACCESS..........................................................................................   8
                                                                                                               
10. IMPROVEMENT FEES AND TAXES..............................................................................   9
                                                                                                               
11. INSURANCE...............................................................................................   9
                                                                                                               
11.1. REQUIRED INSURANCE OF LESSEE..........................................................................   9
11.2. REQUIRED INSURANCE OF LESSOR..........................................................................   9
11.3. POLICIES OF INSURANCE.................................................................................  10
11.4. NO LIMITATION ON LIABILITY............................................................................  10
11.5. COMPLIANCE............................................................................................  10
11.6. RELEASE...............................................................................................  11
</TABLE>
<PAGE>
 
<TABLE> 
<S>                                                                                                           <C> 
12. INDEMNIFICATION.........................................................................................  11

12.1. INDEMNIFICATION BY LESSEE.............................................................................  11
12.2. INDEMNIFICATION BY LESSOR.............................................................................  11
12.3. PROCEDURE.............................................................................................  12

13. ASSIGNMENT..............................................................................................  13

13.1. BY LESSEE.............................................................................................  13
13.2. BY LESSOR.............................................................................................  13

14. REPAIRS.................................................................................................  14

14.1. LESSEE'S OBLIGATION...................................................................................  14
14.2. LESSOR'S OBLIGATION...................................................................................  14

15. CASUALTY OR CONDEMNATION................................................................................  15

15.1. CASUALTY..............................................................................................  15
15.2. CONDEMNATION..........................................................................................  15

16. SURRENDER OF PREMISES; HOLDING OVER.....................................................................  15

17. DEFAULT AND REMEDIES....................................................................................  15

17.1. LESSEE'S EVENTS OF DEFAULT............................................................................  15
17.2. LESSOR'S REMEDIES.....................................................................................  16
17.3. LESSOR's DEFAULT......................................................................................  17
17.4. DUTY TO MITIGATE DAMAGES..............................................................................  17

18. COVENANT OF QUIET ENJOYMENT.............................................................................  18

19. COVENANTS AND WARRANTIES................................................................................  18

19.1. LESSOR................................................................................................  18
19.2. MUTUAL................................................................................................  18
19.3. NO BROKERS............................................................................................  19

20. DISPUTE RESOLUTION......................................................................................  19

20.1. GENERAL...............................................................................................  19
20.2. PROCEDURE.............................................................................................  19
20.3. COSTS.................................................................................................  20

21. ENVIRONMENTAL MATTERS...................................................................................  20

22. SUBORDINATION...........................................................................................  21

22.1. AGREEMENT.............................................................................................  21
22.2. SLA...................................................................................................  21

23. GENERAL PROVISIONS......................................................................................  22

23.1. ENTIRE AGREEMENT......................................................................................  22
23.2. SEVERABILITY..........................................................................................  22
23.3. BINDING EFFECT........................................................................................  22
23.4. CAPTIONS..............................................................................................  22
23.5. NO WAIVER.............................................................................................  22
23.6. NOTICE................................................................................................  23
23.7. GOVERNING LAW.........................................................................................  23
</TABLE> 
<PAGE>
 
                            MASTER LEASE AGREEMENT

     THIS MASTER LEASE AGREEMENT ("Agreement") is entered into as of the 11th
day of June, 1996, by and between Robert Crown d/b/a CROWN COMMUNICATIONS a
sole proprietorship ("Lessor") and SPRINT SPECTRUM L.P., a Delaware limited
partnership ("Lessee").

                                   RECITALS

     Throughout Pittsburgh and the surrounding area the Lessor owns or uses real
property, some of which contains structures owned or used by Lessor. Lessee
wishes to lease from Lessor on a non-exclusive basis certain portions of such
real property for the purpose of locating unmanned radio communications
equipment on Lessor's property. Each location of Lessor's property for which
Lessee leases a portion from Lessor will be referred to individually as a "Site"
and collectively as "Sites".

     NOW THEREFORE, in consideration of the mutual covenants contained in this
Agreement and other good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, the parties agree as follows:

                          1.  MASTER LEASE AGREEMENT

     This Agreement contains the basic terms and conditions upon which each Site
is leased by Lessor to Lessee. When the parties agree on the particular terms
for a Site, the parties will execute a completed Site Lease Acknowledgment in
the form attached as Exhibit A ("SLA"). If such Site is owned, leased, licensed,
or otherwise controlled by Bell Atlantic Nynex Mobile, Inc. ("BANM"), the
parties will enter into an SLA in the form attached as Exhibit "A-1". Each
executed SLA is deemed to be a part of this Agreement. The terms and conditions
of the SLA will govern and control if there is a discrepancy or inconsistency
between the terms and conditions of any SLA and this Agreement. Lessee may
record a memorandum of the SLA in the form attached as Exhibit "A-2". Upon
termination of an SLA for any reason, Lessee will record a notice of termination
of such SLA if Lessee previously recorded a memorandum of such SLA.

                                2.  SITE LEASE

     2.1  LEASE OF SITES. Subject to the terms and conditions contained in this
Agreement and the SLA relating to the Site, Lessor leases and demises to Lessee
and Lessee leases from Lessor that portion of the Site as described on the SLA
(the "Premises"). The property owned, leased or licensed by Lessor will be
described on each SLA. Lessee's equipment and facilities will be mounted on or
in any structure on the Site or on the ground near the structure all as
described in the SLA and in accordance with the terms of this Agreement. The
parties acknowledge that Lessor will not be required to enter into any SLA
unless an Independent Contractor Agreement has been executed by Crown Network
Systems, Inc. and Lessee and is in full force and
<PAGE>
 
effect. The parties further acknowledge that Lessee will not be required to
enter into an SLA for a Site owned, leased, licensed or otherwise controlled by
BANM until Lessee has reviewed the relevant portions of the Master Lease
Agreement dated December 29, 1995 by and between BANM and Lessor.

     2.2  MINIMUM NUMBER OF SITES. Lessee has requested SLA's from Lessor for
the Sites set forth on Exhibit D attached hereto. Lessor shall use its best
efforts to provide SLAs for all such Sites. Lessee agrees to enter into an SLA
for each of the Sites set forth on Exhibit D; provided, however, that the
parties may substitute any of the Sites set forth on Exhibit D with another Site
mutually agreeable to Lessor and Lessee. Notwithstanding the foregoing, the
parties agree that Lessee shall not be required to enter into an SLA for a Site
set forth on Exhibit D unless Lessor provides a signed SLA to Lessee within nine
(9) months of the date hereof.

     2.3  USE OF LESSOR'S SITES. Where a communications tower meeting the
Lessee's design criteria for search areas issued by Lessee after the date of
this Agreement and maintained, operated, owned or controlled by Lessor
(including certain BANM towers) is available within the search area determined
by Lessee's RF Engineers, Lessee shall use its best efforts to utilize such
communications tower as a Site for the installation of a Communications
Facility. The foregoing sentence does not apply to communications towers (a)
located within a 5 mile radius of the USX Tower in the City of Pittsburgh or (b)
located on rooftops.

                                    3.  USE

     The Premises may be used by Lessee only for the installation, operation and
maintenance of unmanned radio communications equipment and related
telecommunications activities (a "Communications Facility") consistent with the
terms of the SLA.

     Lessee must, at Lessee's sole expense, comply with all laws, orders,
ordinances, regulations and directives of applicable federal, state, county, and
municipal authorities or regulatory agencies, including, without limitation, the
Federal Communications Commission ("FCC").

     Lessee must operate the Communications Facility in a manner that does not
interfere with the operations on the Site of Lessor or any other prior existing
users of the Site.

     Lessor agrees to reasonably cooperate with Lessee, at Lessee's expense, in
executing such documents or applications required in order for Lessee to obtain
such licenses, permits or other governmental approvals needed for Lessee's
permitted use of the Premises.

                                       2
<PAGE>
 
                                   4.  TERM

     The initial term of this Agreement ("Initial Term") is ten (10) years
commencing on the date of execution and delivery of this Agreement by both
parties. Subject to the Lessor's written approval, Lessee may enter the Premises
before the Commencement Date (as that term is defined in the SLA), to the extent
such entry is related to engineering surveys, inspections, or other reasonably
necessary tests required prior to construction and installation of the
Communications Facility; said approval will not be unreasonably withheld,
delayed or conditioned. The term of this Agreement will be automatically renewed
for one (1) term of ten (10) years, followed by one (1) term of five (5) years
(each a "Renewal Term") unless Lessee provides Lessor notice of intention not to
renew not less than ninety (90) days prior to the expiration of the Initial Term
or any Renewal Term.

     The Initial Term of each SLA ("SLA Initial Term") will be five (5) years
commencing on the date stated on the SLA, unless otherwise terminated as
provided in this Agreement. The term of each SLA will be automatically renewed
for four (4) additional terms (each an "SLA Renewal Term") of five (5) years
each, unless Lessee provides Lessor with notice of intention not to renew not
less than ninety (90) days prior to the expiration of the SLA Initial Term or
the SLA Renewal Term; provided, however, that all such SLA's shall immediately
terminate upon the termination or expiration of this Agreement.

                                5.  TERMINATION

     5.1.  BY LESSOR

     In addition to any other rights to terminate an SLA, Lessor has the right
to terminate an SLA and all of Lessee's right to the Premises leased on a Site
upon five (5) days' written notice if any equipment placed on the Site by Lessee
unreasonably interferes with any equipment located on the Site on the
Commencement Date and Lessee fails to resolve such interference problem within
two (2) business days of receipt of notice.

     5.2   BY LESSEE

     In addition to any other rights to terminate this Agreement or an SLA,
Lessee has the right to terminate an SLA upon sixty (60) days prior written
notice if:

           5.2.1  Lessee is unable to use the Premises for a Communications
     Facility in the manner originally designed by Lessee when executing the SLA
     due to an obstruction which is (a) created after the date of the SLA; (b)
     within a 3 to 1 slope (3 feet horizontally for every 1 foot of vertical
     drop) from the bottom of the lowest antenna leased by Lessee on the
     Premises; (c) within a quarter mile radius of the Communications Facility;
     and (d) Lessee reasonably demonstrates that such obstruction results in
     signal degradation;

           5.2.2  If within 90 days of Site activation or receipt of Federal
     Aviation Administration approval, but in no event more than 180 days after
     executing an SLA, whichever is later, Lessee determines that it is unable
     to use the Premises for

                                       3
<PAGE>
 
     a Communications Facility in the manner originally designed by Lessee when
     executing the SLA;

           5.2.3  any certificate, permit, license or approval affecting
     Lessee's ability to use the Premises in the manner originally intended by
     Lessee is rejected; or 

           5.2.4 if any previously issued certificate, permit, license or
     approval is canceled, expires, lapses, or is otherwise withdrawn or
     terminated by the applicable governmental agency.

                                   6.  FEES

     6.1   FEE

     The annual lease fee (the "Fee") for a Premises will be payable on or
before the Commencement Date and on or before the first day of the first month
starting after each anniversary of the Commencement Date. The Fee shall be
payable to Lessor at:

     Crown Communications
     Penn Center West 111, Suite 229
     Pittsburgh, PA 15276
     Attention: Robert A. Crown, President

     The Fee will be prorated for any fractional year at the beginning,
expiration or earlier termination of a particular SLA. The Fee for the Premises
shall be determined in accordance with Exhibit B.

     6.2   ADJUSTMENT

     6.2.1 The Fee for a Premise will be adjusted as provided below:

[*]

                                       4

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.
<PAGE>
 
[*]

     6.2.2.  Fee Increase. For purposes of this Section 6.2.2, the "Minimum
Number of Sites" will be the lesser of (a) the number of SLA's leased by Lessee
pursuant to an executed SLA on the second anniversary of the date hereof or (b)
58. For purposes of determining the number of SLA's leased pursuant to
subsection (a) hereof, all SLA's provided by Crown for Sites set forth on
Exhibit D which are at (i) the tower height requested by Lessee; (ii) within 25
feet of the tower height requested by Lessee; or (iii) within a distance of
Lessee's requested tower height that does not exceed 10% of the height of the
tower requested, shall be considered to be leased by Lessee. In the event that
at any time after the second anniversary of the date hereof during the Term of
this Agreement Lessee fails to lease at least the "Minimum Number of SLAs", then
the fee for each Site leased by Lessee hereunder shall increase by [*] per
month payable together with the next annual Fee payment. The foregoing [*] fee
increase shall be adjusted on each Adjustment Date pursuant to the formula set
forth in Section 6.2.1.

     6.2.3.  Fee Decreases. In the event that Lessor and Lessee enter into an
agreement whereby Lessor becomes the exclusive marketing representative for the
Lessee's communications facility network, which shall consist of all sites where
Lessee has the right to market the platform for the installation of transmitting
or receiving equipment for Lessee's PCS system in the Pittsburgh Metropolitan
Trading Area (as the Pittsburgh Metropolitan Area is constituted as of the date
hereof), then the Fee for each Site leased by Lessee hereunder shall decrease by
[*] per month during such time as the exclusive marketing representative
agreement is in full force and effect. Provided that such exclusive marketing
representative agreement is executed within one year from the date hereof, such
reduction shall take place retroactively, applying to all Sites leased on or
after the date of this Agreement and an appropriate credit shall be made by the
Lessor to Lessee. The foregoing [*] fee reduction shall be adjusted on each
Adjustment Date pursuant to the formula set forth in Section 6.2.1.

                                       5

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.
<PAGE>
 
     6.3   INTEREST

     Any Lease Fee not paid within ten (10) business days of when due may, at
Lessor's option, bear interest (the "Past Due Interest Rate") until paid at the
lesser of:

           6.3.1  the rate of interest per annum equal to the interest rate then
     being quoted by Chase Manhattan Bank (or its successor) as its prime rate
     plus two (2) points; or

           6.3.2  the maximum rate allowed under the law of the Commonwealth of
     Pennsylvania.

     6.4   LATE FEE

     If Lessee fails to pay any Lease Fee within ten (10) business days of the
date when due, Lessor may require that Lessee pay to Lessor a late fee of
$150.00 per Site. The late fee is in addition to the interest Lessor may assess
under Section 6.3 of this Agreement. The foregoing late fee shall be adjusted on
each Adjustment Date pursuant to the formula set forth in Section 6.2.1.

     6.5   OTHER AMOUNTS

     Any sums due to Lessor under this Agreement which are not specifically
defined as "Fees" are deemed additional Fees and are subject to the interest
charges and late fees specified in Sections 6.3 and 6.4 and any other provisions
of this Agreement which address Lease Fees.

     6.6   HUB SITE SPACE.

     Where possible, Lessor will provide land area for the installation of a
12'x24' prefabricated equipment building at the cost of [*] per month per
hub site. If space in Lessor's equipment building is available within Lessor's
reasonable discretion, for Lessee's hub site, Lessee shall pay to Lessor [*]
per square foot for Lessor's equipment building space. Lessee shall be
responsible for all construction and utilities required for such hub site space.
The cost for the hub site space shall be payable together with the first payment
of the Fee for each such Site. The fees for hub site space set forth in this
Section 6.6 shall be adjusted on each Adjustment Date pursuant to the formula
set forth in Section 6.2.1.

                       7.  IMPROVEMENTS AND CONSTRUCTION

     7.1   APPROVED COMMUNICATIONS FACILITY

     Lessee has the right at Lessee's sole cost and expense to erect, maintain,
replace and operate at the Premises only that Communications Facility specified
on the SLA. Prior to commencing any installation or material alteration of a
Communications Facility, Lessee must obtain Lessor's approval of:

           7.1.1  Lessee's plans for installation or alteration work; and

           7.1.2  the precise location of the Communications Facility on the
     Site.

                                       6

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
     Lessor's approval must not be unreasonably withheld, conditioned or
delayed. Lessee's replacement of equipment with equipment of (a) substantially
the same wind loading, structural loading, size, weight, height, and (b)
operating at the frequency set forth in the SLA, in the course of repairs or
upgrading the Communications Facility, is not a material alteration.

           All of Lessee's installation and alteration work must be performed:

           7.1.3  at Lessee's sole cost and expense;

           7.1.4  in a good and workmanlike manner;

           7.1.5  in accordance with applicable building uses and the provisions
     of Exhibit C;

           7.1.6  must not adversely affect the structural integrity,
     maintenance or marketability of the Site or any structure on the Site.

     Any structural alterations to a structure on the Site must be designed by a
licensed structural engineer at Lessee's sole cost and expense. For structural
alterations on a tower, such structural engineer must either be approved by the
tower manufacturer or Lessor. For structural alterations requiring a building
permit, the structural engineer must be satisfactory to the local municipality.

     7.2   LIENS

     Lessee must keep the Site free from any liens arising from any work
performed, materials furnished, or obligations incurred by or at the request of
Lessee.

     If any lien is filed against the Site as a result of the acts or omissions
of Lessee, or Lessee's employees, agents, or contractors, Lessee must discharge
the lien or bond the lien off in a manner reasonably satisfactory to Lessor
within thirty (30) days after Lessee receives written notice from any party that
the lien has been filed.

     If Lessee fails to discharge or bond any lien within such period, then, in
addition to any other right or remedy of Lessor, Lessor may, at Lessor's
election, discharge the lien by either paying the amount claimed to be due or
obtaining the discharge by deposit with a court or a title company or by
bonding.

     Lessee must pay on demand any amount paid by Lessor for the discharge or
satisfaction of any lien, and all reasonable attorneys' fees and other legal
expenses of Lessor incurred in defending any such action or in obtaining the
discharge of such lien, together with all necessary disbursements in connection
therewith.

     7.3   POSSESSION

     Taking possession of the Premises by Lessee is conclusive evidence that
     Lessee:

           7.3.1  accepts the Premises as suitable for the purposes for which
     they are leased;

           7.3.2  accepts the Site and any structure on the Site and every part
     and appurtenance thereof AS IS, with all faults; and

                                       7
<PAGE>
 
           7.3.3  waives any claims against Lessor in respect of defects in the
     Site or Premises and its appurtenances, their habitability or suitability
     for any permitted purposes, except:

                  7.3.3.1  if otherwise expressly provided hereunder,

                  7.3.3.2  if resulting from the negligence or willful
           misconduct of Lessor, Lessor's employees, agents or contractors,

                  7.3.3.3  if resulting from a known claim by a third party not
           identified by Lessor in Lessor's representations under this
           Agreement, or

                  7.3.3.4  if known to Lessor and not disclosed to Lessee.

     Lessee is deemed to take possession only at the time Lessee commences
construction of the Communications Facility on the Premises or within 90 days of
the execution of the SLA, whichever event first occurs. Conducting tests and
inspections on the Premises is not the commencement of construction.


                                 8.  UTILITIES

     Lessee has the right, at Lessee's sole cost and expense, to obtain
electrical and telephone service from any utility company that currently
provides such service to the Premises. Lessee may arrange for the installation
of a separate meter and main breaker, subject to Lessor's right to approve the
exact location of proposed utility routes and the manner of installation. Lessee
shall pay for all utility services utilized by Lessee in the operation of
Lessee's communications equipment at each Site.


                                  9.  ACCESS

     The following provisions shall govern access to the Premises, unless
otherwise modified on an SLA:

     9.1.  CONSTRUCTION. Access for construction, routine maintenance and repair
and other non-emergency visits is during normal business hours (defined as
Monday through Saturday, 7 am to 7 pm).

     9.2.  EMERGENCY. In the event of emergency, Lessee is entitled to access
the Premises twenty-four (24) hours per day, seven (7) days per week.

     9.3.  TYPE OF ACCESS. Access to the Premises may be by foot or motor
vehicle, including trucks and equipment.

     Lessee acknowledges that the foregoing access rights are subject to any
limitations or restrictions on access imposed upon Lessor (and therefore upon
Lessee) by the underlying document or documents evidencing Lessor's underlying
real estate interest including any ground lease or master lease ("Ground Lease")
relating to a particular Site, except limitations or restrictions imposed by a
landlord which is an affiliate of Lessor shall not be more restrictive than
those contained in this Section. Lessee agrees to abide by

                                       8
<PAGE>
 
such limitations or restrictions as provided in the Ground Lease, copies of
which shall be provided to Lessee by Lessor together with the SLA.


                        10.  IMPROVEMENT FEES AND TAXES

     Lessee must pay all taxes and other fees or charges attributable to the
Communications Facility or any increases thereto.

     Lessor must pay all taxes and other fees or charges attributable to each
of the Premises (including, without limitation, debt and ground lease
obligations), each Site and, if required under Lessor's ground lease
obligations, the real estate of which the Premises are a portion.


                                11.  INSURANCE

     11.1  REQUIRED INSURANCE OF LESSEE

     Lessee must, during the term of this Agreement and at Lessee's sole
expense, obtain and keep in force, not less than the following insurance:

           11.1.1.  Property insurance, including coverage for fire, extended
     coverage, vandalism and malicious mischief, upon each Communications
     Facility in an amount not less than ninety percent (90%) of the full
     replacement cost of the Communications Facility;

           11.1.2.  Commercial General Liability insuring operations hazard,
     independent contractor hazard, contractual liability, and products and
     completed operations liability, in limits not less than $10,000,000
     combined single limit for each occurrence for bodily injury, personal
     injury and property damage liability, naming Lessor as an additional
     insured;

           11.1.3.  Statutory Workers' Compensation and Employer's Liability
     insurance;

           11.1.4.  All insurers will be Rated AX(10) or better; and

           11.1.5.  Automobile liability insurance in an amount not less than
     $1,000,000 combined single limit for bodily injury and/or property damage.
     Insurance will include coverage for all automobiles including hired and 
     non-owned.

     11.2  REQUIRED INSURANCE OF LESSOR

     Lessor must, during the term of this Agreement and at Lessor's sole
expense, obtain and keep in force, the following insurance:

           11.2.1.  Property insurance, including coverage for fire, extended
     coverage, vandalism and malicious mischief on the Site, in an amount not
     less than 90% of

                                       9
<PAGE>
 
     the full replacement cost of the Site (excluding, however, the
     Communications Facility); and

           11.2.2.  Commercial General Liability insuring operations hazard,
     independent contractor hazard, contractual liability and products and
     completed operations liability, in limits not less than $10,000,000
     combined single limit for each occurrence for bodily injury, personal
     injury and property damage liability, naming Lessee as an additional
     insured.

     11.3  POLICIES OF INSURANCE

     All required insurance policies must be taken out with reputable national
insurers that are licensed to do business in the jurisdiction were the Premises
and Sites are located. Each party agrees that certificates of insurance will be
delivered to the other party as soon as practicable after the placing of the
required insurance, but not later than the Commencement Date of a particular
SLA. All policies must contain an undertaking by the insurers to notify the
other party in writing not less than fifteen (15) days before any material
change, reduction in coverage, cancellation, or termination of the insurance.

     Lessor and Lessee will each year review the limits for the insurance
policies required by this Agreement. Policy limits will be adjusted to proper
and reasonable limits as circumstances warrant, but policy limits will not be
reduced below those stated above and no increases will be effective unless
Lessor and Lessee mutually agree.

     11.4  NO LIMITATION ON LIABILITY

     The provision of insurance required in this Agreement shall not be
construed to limit or otherwise affect the liability of any party to the other
party.

     11.5  COMPLIANCE

     Lessee will not do or permit to be done in or about the Premises, nor bring
or keep or permit to be brought to the Premises, anything that:

           11.5.1.  is prohibited by any insurance policy carried by Lessor
     covering the Site, any improvements thereon, or the Premises; or

           11.5.2.  will increase the existing premiums for any such policy
     beyond that contemplated for the addition of the Communications Facility.

     Lessor acknowledges and agrees that the installation of the Communications
Facility upon the Premises in accordance with the terms and conditions of this
Agreement will be considered within the underwriting requirements of any of
Lessor's insurers and such premiums contemplate the addition of the
Communications Facility.

                                      10
<PAGE>
 
     11.6  RELEASE

     Lessor and Lessee release each other, and their respective principals,
employees, representatives and agents, from any claims for damage to any person
or to the Premises, the Site and any improvements thereon, that are caused by,
or result from, risks insured against under any insurance policies carried by
the parties and in force at the time of any such damage and any risks which
would be covered by the insurance which such party is required to carry
hereunder. Each party shall cause each insurance policy obtained by it to
provide that the insurance company waives all right of recovery by way of
subrogation against the other party in connection with any damage covered by any
policy.


                             12.  INDEMNIFICATION

     12.1  INDEMNIFICATION BY LESSEE

     Lessee must indemnify Lessor and save it harmless from and against any
and all claims, actions, damages, liability and expense in connection with the
loss of life, personal injury, and/or damage to property arising from or out of:

           12.1.1.  any occurrence in, upon or at the Premises or the Site
     caused by the act or omission of Lessee or Lessee's agents, customers,
     invitees, concessionaires, contractors, servants, vendors, materialmen or
     suppliers, except to the extent caused by the negligence or willful
     misconduct of Lessor, Lessor's agents, customers, invitees,
     concessionaires, contractor, servants, vendors, materialmen or suppliers;

           12.1.2.  any occurrence caused by the violation of any law,
     regulation or ordinance applicable to Lessee's actual use of or presence on
     the Premises or the actual use of or presence on the Premises by Lessee's
     agents, customers, invitees, concessionaires, contractors, servants,
     vendors, materialmen or suppliers; or

           12.1.3.  real estate brokers claiming by, through or under Lessee for
     any commission, fee or payment in connection with this Agreement.

     If Lessor is made a party to any litigation commenced by or against Lessee
for any of the above reasons, then Lessee shall protect and hold Lessor harmless
and pay all costs, penalties, charges, damages, expenses and reasonable
attorneys' fees incurred or paid by Lessor in accordance with the provisions of
Section 12.3 of this Agreement.

     12.2  INDEMNIFICATION BY LESSOR

     Lessor must indemnify Lessee and save it harmless from and against any and
all claims, actions, damages, liability and expense in connection with the loss
of life, personal injury, and/or damage to property arising from or out of:

           12.2.1.  any occurrence in, upon or at the Premises or the Site
     caused by the act or omission of Lessor or Lessor's agents, customers,
     invitees,

                                      11
<PAGE>
 
     concessionaires, contractors, servants, vendors, materialmen or suppliers,
     except to the extent caused by the negligence or willful misconduct of
     Lessee, Lessee's agents, customers, invitees, concessionaires, contractor,
     servants, vendors, materialmen or suppliers;

           12.2.2.  any occurrence caused by the violation of any law,
     regulation or ordinance applicable to Lessor's actual use of or presence on
     the Premises or the actual use of or presence on the Premises by Lessor's
     agents, customers, invitees, concessionaires, contractors, servants,
     vendors, materialmen or suppliers; or

           12.2.3.  real estate brokers claiming by, through or under Lessor for
     any commission, fee or payment in connection with this Agreement.

     If Lessee is made a party to any litigation commenced by or against Lessor
     for any of the above reasons, then Lessor shall protect and hold Lessee
     harmless and pay all costs, penalties, charges, damages, expenses and
     reasonable attorneys' fees incurred or paid by Lessee in accordance with
     the provisions of Section 12.3 of this Agreement.

     12.3  PROCEDURE

           12.3.1   Any party being indemnified ("Indemnitee") shall give the
     party making the indemnification ("Indemnitor") written notice as soon as
     reasonably possible if:

                    12.3.1.1.  any claim or demand shall be made or liability
           asserted against Indemnitee, or

                    12.3.1.2.  any suit, action, or administrative or legal
           proceedings shall be instituted or commenced in which any Indemnitee
           is involved or is named as a defendant, either individually or with
           others.

           12.3.2   If, within thirty (30) days after the giving of such notice,
     the Indemnitee receives written notice from Indemnitor stating that the
     Indemnitor disputes or intends to defend against such claim, demand,
     liability, suit, action or proceeding, then Indemnitor will have the right
     to select counsel of its choice and to dispute or defend against such
     claim, demand, liability, suit, action or proceeding, at Indemnitor's
     expense. Indemnitee will fully cooperate with Indemnitor in such dispute or
     defense so long as Indemnitor is conducting such dispute or defense
     diligently and in good faith; provided, however, that Indemnitor will not
     be permitted to settle such dispute or claim without the prior written
     approval of Indemnitee, which shall not be unreasonably withheld,
     conditioned or delayed. Even though Indemnitor selects counsel of its
     choice, Indemnitee has the right to additional representation by counsel of
     its choice to participate in such defense at Indemnitee's sole cost and
     expense.

           12.3.3   If no such notice of intent to dispute or defend is received
     by Indemnitee within the thirty (30) day period, or if diligent and good
     faith defense

                                      12
<PAGE>
 
     is not being, or ceases to be, conducted, Indemnitee has the right to
     dispute and defend against the claim, demand or other liability at the sole
     cost and expense of Indemnitor and to settle such claim, demand or other
     liability, and in either event to be indemnified as provided for in this
     Section. Indemnitee is not permitted to settle such dispute or claim
     without the prior written approval of Indemnitor, which approval shall not
     be unreasonably withheld, conditioned or delayed.

           12.3.4   The Indemnifying Party's indemnity obligation includes
     reasonable attorneys' fees, investigation costs, and all other reasonable
     costs and expenses incurred by the Indemnified Party from the first notice
     that any claim or demand has been made or may be made, and is not limited
     in any way by any limitation on the amount or type of damages,
     compensation, or benefits payable under applicable workers' compensation
     acts, disability benefit acts, or other employee benefit acts. The
     provisions of this Section shall survive the termination of this Agreement
     with respect to any damage, injury, or death occurring before such
     termination.


                                13.  ASSIGNMENT

     13.1  BY LESSEE

     Notwithstanding any provision to the contrary, Lessee may without Lessor's
consent assign this Agreement, either in whole or in part, to any subsidiary or
affiliate of Lessee provided Lessee notifies Lessor in writing of its intention
to so assign, or sublet. For purposes of this paragraph, the terms "subsidiary"
and "affiliate" shall be defined as any corporation or entity which controls
Lessee, is controlled by Lessee or is under the common control with Lessee by
the same parent corporation or other entity or successor of Lessee, provided
such successor is in the same business as Lessee and the successor, and any
assignor of this Agreement, so long as they may remain liable for performance of
this Agreement, on a combined basis have a net worth of at least $25,000,000.
The foregoing net worth requirement shall be adjusted on each Adjustment Date
pursuant to the formula set forth in Section 6.2.1. The assignment of this
Agreement does not constitute a release of any liability the assignor has for
the performance of this Agreement. Lessee will not assign, sublet, or otherwise
transfer this Agreement, an SLA or any Premises to any party other than as set
forth in this Section 13.1 without Lessor's prior written consent, which consent
may not be unreasonably withheld, conditioned or delayed.

     13.2  BY LESSOR

     Lessor may make any sale, lease, license, assignment or transfer of any
Site, provided such sale, lease, license, assignment or transfer is subject to
the terms and conditions of this Agreement and the applicable SLA. Lessor may
sell, lease, license, assign or transfer this Agreement together with all SLA's,
provided Lessor notifies Lessee in writing of its intention to so sell, lease,
license, assign or transfer and the successor has a net worth of at least
$25,000,000. The foregoing net worth requirement shall be

                                      13
<PAGE>
 
adjusted on each Adjustment Date pursuant to the formula set forth in Section
6.2.1. The sale, lease, license, assignment or transfer of this Agreement does
not constitute a release of any liability the assignor has for the performance
of this Agreement. Lessor will not sell, lease, license, assign or otherwise
transfer this Agreement to any party other than as set forth in this Section
13.2 without Lessee's prior written consent, which consent may not be
unreasonably withheld, conditioned or delayed.


                                 14.  REPAIRS 

     14.1  LESSEE'S OBLIGATION

     Lessee must, at all times during the term of any particular SLA, at
Lessee's sole cost and expense, keep and maintain the Communications Facility
located by Lessee upon the Premises in a structurally safe and sound condition
and in good repair.

     If Lessee does not make such repairs within twenty (20) days after receipt
of notice from Lessor requesting such repairs and such repairs are required,
then Lessor may, at Lessor's option, make the repairs. Lessee shall pay Lessor
on demand Lessor's actual costs in making the repairs, plus Lessor's actual
overhead.

     If Lessee commences to make repairs within twenty (20) days after any
written notice from Lessor requesting such repairs and thereafter continuously
and diligently pursues and completes such repair, then the twenty (20) day cure
period will extend for an additional sixty (60) days to permit Lessee to
complete such repairs.

     If emergency repairs are needed to protect persons, or property, or to
allow the use of the Premises, Lessee must immediately correct the safety or use
problem, even if a full repair cannot be made at that time or Lessor may make
such repairs at Lessee's expense.

     14.2  LESSOR'S OBLIGATION

     Lessor must, at all times during the term of any SLA and at Lessor's sole
cost and expense, keep and maintain the Site and any improvements located
thereon in a structurally sound and safe condition.

     If Lessee is unable to use the Communications Facility because of repairs
required on the Premises, then Lessee may immediately erect on the Premises or
an unused portion of the Site a temporary Communications Facility, including any
supporting structure, while Lessor makes repairs to the Premises.

                                      14
<PAGE>
 
                         15.  CASUALTY OR CONDEMNATION

     15.1  CASUALTY

     If there is a casualty to any structure upon which a Communications
Facility is located, Lessor must within sixty (60) days repair or restore the
structure. Lessee may immediately erect on the Premises or an unused portion of
the Site a temporary Communications Facility, including any supporting
structure, while Lessor makes repairs to the Premises. Upon completion of such
repair or restoration, Lessee is entitled to reinstall Lessee's Communications
Facility. In the event such repairs or restoration will reasonably require more
than sixty (60) days to complete, Lessee is entitled to terminate the applicable
SLA upon thirty (30) days prior written notice.

     15.2  CONDEMNATION

     If there is a condemnation of the Site, including without limitation a
transfer of the Site by consensual deed in lieu of condemnation, then the SLA
for the condemned Site will terminate upon transfer of title to the condemning
authority, without further liability to either party under this Agreement.
Lessee is entitled to pursue a separate condemnation award for the
Communications Facility from the condemning authority.


                   16.  SURRENDER OF PREMISES; HOLDING OVER

     Upon the expiration or other termination of a SLA for any cause whatsoever,
Lessee must peacefully vacate the applicable Premises in as good order and
condition as the same were at the beginning of the applicable SLA, except for
reasonable use, wear and tear and casualty and condemnation. Lessee has the
absolute right to remove its Communications Facility. Lessee will repair any
damage caused during the removal of the Communications Facility and will return
the Premises to its original condition, including the removal of any concrete
foundations, normal wear and tear excepted.

     If Lessee continues to hold any Premises after the termination of the
applicable SLA, whether the termination occurs by lapse of time or otherwise,
such holding over will, unless otherwise agreed to by Lessor in writing,
constitute and be construed as a month-to-month tenancy at a monthly Lease Fee
equal to 1/12th of 125% of the Fee for such SLA and subject to all of the other
terms set forth in this Agreement.


                           17.  DEFAULT AND REMEDIES

     17.1  LESSEE'S EVENTS OF DEFAULT

     The occurrence of any one or more of the following events constitutes an
"event of default" by Lessee under the applicable SLA:

           17.1.1   if Lessee fails to pay any Fee or other sums payable by
     Lessee for the applicable Premises within ten (10) business days of
     Lessee's receipt of written request for payment;

                                      15
<PAGE>
 
           17.1.2   if Lessee fails to perform or observe any other term of the
     applicable SLA, including terms and conditions applicable thereto contained
     in this Agreement, and such failure continues for more than fifteen (15)
     days after written notice from Lessor; except such fifteen (15) day cure
     period will be extended as reasonably necessary to permit Lessee to
     complete cure so long as Lessee commences cure within such fifteen (15)
     day cure period and thereafter continuously and diligently pursues and
     completes such cure;

           17.1.3   if any petition is filed by or against Lessee, under any
     section or chapter of the present or any future federal Bankruptcy Code or
     under any similar law or statute of the United States or any state thereof
     (and with respect to any petition filed against Lessee, such petition is
     not dismissed within ninety (90) days after the filing thereof), or Lessee
     is adjudged bankrupt or insolvent in proceedings filed under any section or
     chapter of the present or any future federal Bankruptcy Code or under any
     similar law or statute of the United States or any state thereof;

           17.1.4   if a receiver, custodian, or trustee is appointed for Lessee
     or for any of the assets of Lessee and such appointment is not vacated
     within sixty (60) days of the date of the appointment; or

           17.1.5   if Lessee becomes insolvent or makes a transfer in fraud of
     creditors.

           17.1.6.  if Lessee's equipment is found to be interfering as
     described in Paragraph 5.1.

           17.1.7.  Breach of any representation, warranty or agreement set
     forth in this Agreement.

     17.2  LESSOR'S REMEDIES

     If an event of default occurs, while Lessee remains in default, Lessor
(without notice or demand except as expressly required above) may terminate the
applicable SLA, in which event Lessee will immediately surrender the applicable
Premise to Lessor. Lessee will become liable for damages equal to the total of:

           17.2.1   the actual costs of recovering the Premises;

           17.2.2   the Fee earned as of the date of termination, plus interest
     thereon at the Past Due Interest Rate from the date due until paid;

           17.2.3   the amount by which the Fee and other benefits that Lessor
     would have received under the applicable SLA for the remainder of the term
     under the applicable SLA after the time of award subject to Lessor's duty
     to mitigate damages pursuant to Paragraph 17.4.

           17.2.4   all other sums of money and damages owing by Lessee to
     Lessor.

           17.2.5   If at any time during this Agreement any of the events set
     forth in 17.1.1., 17.1.2. or 17.1.3. have previously occurred with respect
     to (five percent)

                                      16
<PAGE>
 
     5% or more of the SLAs, Lessor, at Lessor's sole option, is entitled to
     terminate this Agreement upon thirty (30) days prior written notice to
     Lessee.

          Lessor may elect any one or more of the foregoing remedies with
respect to any particular SLA.

     17.3 LESSOR'S DEFAULT

     If Lessor is in:

          17.3.1  breach of any representation, warranty or agreement set forth
     in this Agreement; or

          17.3.2  if Lessor fails to perform or observe any other term of the
     applicable SLA, including terms and conditions applicable thereto contained
     in this Agreement, and such failure continues for more than fifteen (15)
     days after written notice from Lessee; except such fifteen (15) day cure
     period will be extended as reasonably necessary to permit Lessor to
     complete cure so long as Lessor commences cure within such fifteen (15)
     day cure period and thereafter continuously and diligently pursues and
     completes such cure;

          Lessee may, in addition to any other remedy available at law or in
     equity, at Lessee's option upon written notice,

          17.3.3  terminate the applicable SLA; or

          17.3.4  incur any expense reasonably necessary to perform the
     obligation of Lessor specified in such notice and invoice Lessor for the
     actual expenses, together with interest from the date named at the Past Due
     Interest Rate. Any invoice shall be accompanied by documentation reasonably
     detailing actual expenses. If Lessor fails to reimburse the costs within
     thirty (30) days of receipt of written invoice, then Lessee is entitled to
     offset and deduct such expenses from the Fees or other charges next
     becoming due under any SLA.

     Lessee may elect any one or more of the foregoing remedies with respect to
any particular SLA.

     17.4 DUTY TO MITIGATE DAMAGES

     Lessee and Lessor shall endeavor in good faith to mitigate damages arising
under this Agreement.

                                      17
<PAGE>
 
                         18. COVENANT OF QUIET ENJOYMENT


     Lessor covenants and warrants that Lessee or any successor permitted by
Section 13.1 or other transferees approved by Lessor, upon the payment of Fees
and performance of all the terms, covenants and conditions under this Agreement,
will have, hold and enjoy each Premises leased under a SLA during the term of
the applicable SLA or any renewal or extension thereof. Lessor will take no
action not expressly permitted under the terms of this Agreement that will
interfere with Lessee's intended use of the Premises nor will Lessor fail to
take any action or perform any obligation necessary to fulfill Lessor's
aforesaid covenant of quiet enjoyment in favor of Lessee.


                         19. COVENANTS AND WARRANTIES

     19.1  LESSOR

Lessor warrants, with respect to each particular SLA that:

          19.1.1  Lessor or the entity for which Lessor possesses the exclusive
     management rights, owns good marketable fee simple title, has a good and
     marketable leasehold interest, has the right as manager, or has a valid
     license or easement in the land on which the Site and Premises are located
     and has rights of access thereto pursuant to a Ground Lease;

          19.1.2  Lessor will not permit or suffer the installation and
     existence of any other improvement (including, without limitation,
     transmission or reception devices) upon the structure or land of which any
     Site or Premises is a portion if such improvement materially interferes
     with transmission or reception by Lessee's Communications Facility in any
     manner whatsoever; and

          19.1.3  The Premises are to the best of the knowledge of Lessor not
     contaminated by any Environmental Hazards (as defined in Section 21).

          19.1.4. Lessor represents that telephone and electrical service are
     currently available at the Site. In the event that Lessor fails to make
     such telephone and electrical service available to the Site, Lessor agrees
     that:

               19.1.4.1.  The Premises includes such non-exclusive easement
          rights as necessary to enable Lessee to connect utility wires, cables,
          fibers and conduits to the Communication Facility; and

               19.1.4.2.  Lessor has no right to prevent such installation,
          except Lessor does have the right to approve the manner or
          installation so long as such approval is not unreasonably withheld,
          conditioned or delayed.


     19.2  MUTUAL

     Each party represents and warrants to the other party that:

                                      18
<PAGE>
 
          19.2.1  it has full right, power and authority to make this Agreement
     and to enter into the SLAs;

          19.2.2  the making of this Agreement and the performance thereof will
     not violate any laws, ordinance, restrictive covenants, or other agreements
     under which such party is bound;

          19.2.3  that such party is a duly organized and existing corporation
     or limited partnership;

          19.2.4  the party is qualified to do business in any state in which
     the Premises and Sites are located; and

          19.2.5  all persons signing or behalf of such party were authorized to
     do so by appropriate corporate or partnership action.


     19.3  NO BROKERS

     Lessee and Lessor represent to each other that neither has had any dealings
with any real estate brokers or agents in connection with the negotiation of
this Agreement.

                         20. DISPUTE RESOLUTION

     20.1  GENERAL

     Except as provided otherwise in this Agreement, any controversy between the
parties rising out of this Agreement or any SLA, or breach thereof, is subject
to the mediation process described below. If not resolved by mediation, then the
matter must be submitted to the American Arbitration Association ("AAA") for
arbitration before a sole arbitrator in the city nearest Lessor's regional
office nearest the location of the Site in dispute.

     20.2  PROCEDURE

     A meeting will be held promptly between the parties to attempt in good
faith to negotiate a resolution of the dispute. The meeting will be attended by
individuals with decision making authority regarding the dispute. If within
thirty (30) days after such meeting the parties have not succeeded in resolving
the dispute, they will, within thirty (30) days thereafter submit the dispute to
a mutually acceptable third-party mediator who is acquainted with dispute
resolution methods. Lessor and Lessee will participate in good faith in the
mediation and the mediation process. The mediation shall be nonbinding. If the
dispute is not resolved by mediation either party may initiate an arbitration
with the AAA, and the dispute shall be resolved by binding arbitration under the
rules and administration of the AAA, and judgment upon the award rendered by the
arbitrator(s) may be entered in any court having jurisdiction thereof. Neither
party is entitled to seek or recover punitive damages in considering or fixing
any award under these proceedings. The parties agree that with respect to the
interference issues set forth in Sections 5.1 or 19.1.2, either party may elect
to bypass

                                      19
<PAGE>
 
the foregoing resolution mechanism and proceed directly for injunctive relief in
the state or federal courts located in Allegheny County, Pennsylvania.

     20.3  COSTS

     The costs of mediation and arbitration, including any mediator's fees, AAA
administration fee, the arbitrators fee, and costs for the use of facilities
during the hearings, shall be borne equally by the parties. Reasonable
attorneys' fees, costs and expenses may be awarded to the prevailing party
(provided such a party can clearly be determined from the proceedings) at the
discretion of the arbitrator. Each party's other costs and expenses will be
borne by the party incurring them.

                         21. ENVIRONMENTAL MATTERS

     Lessor represents and warrants that to the best of Lessor's knowledge there
are no Environmental Hazards on any Site. Nothing in this Agreement or in any
SLA will be construed or interpreted to require that Lessee remediate any
Environmental Hazards located at any Site unless Lessee or Lessee's officers,
employees, agents, or contractors placed the Environmental Hazards on the Site.

     Lessee will not bring to, transport across or dispose of any Environmental
Hazards on any particular Premises or Site without Lessor's prior written
approval, which approval shall not unduly be withheld except Lessee may keep on
the Premises substances used in back up power units (such as batteries and
diesel generators) commonly used in the wireless telecommunications industry.
Lessee's use of any approved substances constituting Environmental Hazards must
comply with all applicable laws, ordinances, and regulations governing such use.

     The term "Environmental Hazards" means hazardous substances, hazardous
wastes, pollutants, asbestos, polychlorinated biphenyl (PCB), petroleum or other
fuels (including crude oil or any fraction or derivative thereof and underground
storage tanks. The term "hazardous substances" shall be as defined in the
Comprehensive Environmental Response, Compensation, and Liability Act, and any
regulations promulgated pursuant thereto. The term "pollutants" shall be as
defined in the Clean Water Act, and any regulations promulgated pursuant
thereto. This Section shall survive termination of the Agreement and any
particular SLA.

                                      20
<PAGE>
 
                         22. SUBORDINATION


     22.1  AGREEMENT

     Lessee agrees that this Agreement and each SLA is subject and subordinate
at all times to the lien of all mortgages and deeds of trust securing any amount
or amounts whatsoever which may now exist or hereafter be placed on or against
the Premises or on or against Lessor's interest or estate therein, and any
underlying ground lease or master lease on a particular Site, all without the
necessity of having further instruments executed by Lessee to effect such
subordination, but, with respect to any such liens or leases which arise
following execution of this Agreement, only upon the condition that any such
mortgagee, beneficiary, trustee or ground lessor expressly agrees not to disturb
the rights of Lessee under this Agreement and each SLA.

     22.2  SLA

     Each SLA is subject to any restrictions or other terms or conditions
contained in the underlying Ground Lease. Lessee agrees to commit no act or
omission which would constitute a default under any Ground Lease that Lessor has
provided a copy of to Lessee.

     Lessor is not required to obtain any consent from the landlord under such
Ground Lease in order for Lessee to construct, operate, maintain or access the
Communications Facility, unless expressly set forth in the applicable SLA.

     If a particular restriction contained in a Ground Lease and not set forth
on the applicable SLA prevents Lessee from the construction, operation or
maintenance of or access to the Communications Facility, Lessee is entitled to
terminate the applicable SLA.

     Upon the expiration or termination of any Ground Lease, with respect to a
particular Site, the SLA relating to such Site automatically terminates without
further liability to either party. Lessee acknowledges that many of Lessor's
underlying leases or licenses may grant to the property owner the right to
terminate such underlying leases or licenses on the Site, and that in the event
of such termination, the SLA with respect to such Site shall terminate
concurrently herewith.

     Lessor agrees that Lessor will not breach the terms or conditions of any
Ground Lease in a manner that affects Lessee's use of the Premises.

                                      21
<PAGE>
 
                         23. GENERAL PROVISIONS


     23.1  ENTIRE AGREEMENT

     This Agreement and each SLA constitutes the entire agreement and
understanding between the parties, and supersedes all offers, negotiations and
other agreements concerning the subject matter contained in this Agreement.
There are no representations or understandings of any kind not set forth in this
Agreement. Any amendments to this Agreement or any SLA must be in writing and
executed by both parties.

     23.2  SEVERABILITY

     If any provision of this Agreement or any SLA is invalid or unenforceable
with respect to any party, the remainder of this Agreement, the applicable SLA
or the application of such provision to persons other than those as to whom it
is held invalid or unenforceable, is not to be affected and each provision of
this Agreement or the applicable SLA is valid and enforceable to the fullest
extent permitted by law.

     23.3  BINDING EFFECT

     This Agreement and each SLA will be binding on and inure to the benefit of
the respective parties' successors and permitted assignees.

     23.4  CAPTIONS

     The captions of this Agreement are inserted for convenience only and are
not to be construed as part of this Agreement or the applicable SLA or in any
way limiting the scope or intent of its provision.

     23.5  NO WAIVER

     No provision of this Agreement or a SLA will be deemed to have been waived
by either party unless the waiver is in writing and signed by the party against
whom enforcement is attempted. No custom or practice which may develop between
the parties in the administration of the terms of this Agreement or any SLA is
to be construed to waive or lessen any party's right to insist upon strict
performance of the terms of this Agreement or any SLA. The rights granted in
this Agreement and under each SLA is cumulative of every other right or remedy
that the enforcing party may otherwise have at law or in equity or by statute
and the exercise of one or more rights or remedies will not prejudice or impair
the concurrent or subsequent exercise of other rights or remedies.

     The parties acknowledge and agree that they have been represented by
counsel and that each of the parties has participated in the drafting of this
Agreement and each SLA. Accordingly, it is the intention and agreement of the
parties that the language, terms and conditions of this Agreement and each SLA
are not to be construed in any way against or in favor of any party hereto by
reason of the responsibilities in connection with the preparation of this
Agreement or each SLA.

                                      22
<PAGE>
 
     23.6  NOTICE

     Any notice or demand required to be given in this Agreement shall be made
by certified or registered mail, return receipt requested or reliable overnight
courier to the address of other parties set forth below:

     LESSOR:        Crown Communications                
                    Penn Center West III, Suite 229
                    Pittsburgh, PA 15276
                    Attn: Robert A. Crown, President

     LESSEE:        Sprint Spectrum, L.P.
                    Penn Center West II, Suite 200                
                    Pittsburgh, PA 15276
                    Attn: David P. Snyder, Director of Operations and 
                    Engineering

     Any such notice is deemed received one (1) business day following deposit
with a reliable overnight courier or five (5) business days following deposit in
the United States mails addressed as required above. Lessor or Lessee may from
time to time designate any other address for this purpose by written notice to
the other party.

     23.7  GOVERNING LAW

     This Agreement and each SLA is governed by the laws of the Commonwealth of
Pennsylvania. Notwithstanding the foregoing, in the event of a dispute over a
particular Site or Premises, the laws of the state where the Site and Premise
are located shall govern.

     23.8  NO LIENS

     Each Communications Facility and related property located upon any Premises
by Lessee pursuant to the terms of this Agreement and the applicable SLAs will
at all times be and remain the property of Lessee and will not be subject to any
lien or encumbrance created or suffered by Lessor. Lessee has the right to make
such public filings as it deems necessary or desirable to evidence Lessee's
ownership of the Communications Facility. Lessor waives all lessor's or
landlord's lien on any property of Lessee (whether created by statute or
otherwise). Notwithstanding the foregoing, in the event of termination or
expiration of a SLA, if all of the Communications Facility located on the
Premises is not removed within thirty (30) days following such termination or
expiration, such equipment remaining shall be deemed abandoned and Lessor's
waiver of lien shall thereafter be void and of no further force and effect.

                                      23
<PAGE>
 
     23.9  FORCE MAJEURE

     If a party is delayed or hindered in, or prevented from the performance
required under this Agreement (except for payment of monetary obligations) by
reason of earthquakes, landslides, strikes, lockouts, labor troubles, failure of
power, riots, insurrection, war, acts of God or other reason of like nature not
the fault of the party delayed in performing work or doing acts, such party is
excused from such performance for the period of delay. The period for the
performance of any such act shall then be extended for the period of such delay.

     23.10 TIME IS OF THE ESSENCE    

     Time is of the essence with respect to the provisions of this Agreement and
each SLA.

     24. NON-DISCLOSURE  

The parties agree that without the express written consent of the other Party,
neither Party shall reveal, disclose or promulgate to any third party the terms
contained in this Agreement or any Exhibit or SLA to it, except to such third
party's auditor, accountant or attorney or to a governmental agency of required
by regulation, subpoena or governmental order to do so.

     IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first above written.


SPRINT SPECTRUM L. P.                   CROWN COMMUNICATIONS



By: /s/ Kurt Bagwell                    By: /s/ Robert A. Crown
   ------------------------------          ----------------------------
Name: Kurt Bagwell                      Name: Robert A. Crown
Title: Owner
Assistant Vice President, Engineering
and Operations, East Region

                                      24
<PAGE>
 
                           EXHIBIT "A" TO THE MASTER

                          SITE LEASE ACKNOWLEDGEMENT
                          --------------------------


This Site Lease Acknowledgement ("SLA") is made and entered into as of this_____
day of ________________, 19__ by and between Robert A. Crown, d/b/a CROWN
COMMUNICATIONS hereinafter designated as "Lessor" and SPRINT SPECTRUM, L.P., a
Delaware Limited Partnership hereinafter designed as "Lessee", pursuant and
subject to that certain Agreement ("Agreement") by and between the Parties
hereto, dated as of ______________________, 1996. All capitalized terms have the
meanings ascribed to them in the Master Agreement.

1.   The Parcel will consist of that certain parcel of property located in the
     City of____________________, the County of _________________, and the State
     of ___________________, more particularly described as a ________________'
     by _______________' parcel containing approximately ______ square feet
     situated at _____________________ (add legal description), together with
     the non-exclusive right for ingress and egress, seven (7) days a week,
     twenty four (24) hours a day, on foot or motor vehicle, including trucks,
     and for the installation and maintenance of utility wires, poles, cables,
     conduits and pipes over, under or along a _____' wide right-of-way
     extending from the nearest public right-of-way, ______________________ to
     the demised premises, said premises and right-of-way for access being
     substantially as described herein in Exhibit "1" to the SLA attached
     hereto and made a part hereof.

2.   Lessee's antenna(s) will consist of ________ antennas, each described in
     terms of type, size, frequency, effective radiated power and height on the
     tower outlined as follows:

     Manufacturer and Type-Number:                ______________________________

                                                  ______________________________

     Number of Antennas:                          ______________________________

     Weight and Dimension of Antenna(s):          ______________________________

     Transmission Line Mig. and Type No.:         ______________________________

     Diameter and Length of Transmission Line:    ______________________________

     Height of Antenna(s) on Tower:               ______________________________
     
     Direction of Radiation:                      ______________________________

     Equipment Building/Floor Space

        Dimensions:                               ______________________________

     Frequencies/Max Power Output                 ______________________________


3.   The Fee due and payable by Lessee to Lessor is $__________ per year.

4.   The commencement date of this SLA will be upon commencement of construction
     at the Premises or ninety (90) days from the date hereof, whichever occurs
     first ("Commencement Date"). For purposes of this SLA, any physical
     activity on the Site by Lessee, other than those preliminary activities set
     forth in Article 4 of the Agreement, shall constitute the commencement of
     the construction.
<PAGE>
 
5.   The parties acknowledge that Lessor's rights in the property derive from a
     certain Lease Agreement dated ________________ between Lessor herein and
     _________________, hereinafter referred to as the "Prime Lease" and
     attached hereto as Exhibit "2" to the SLA.


IN WITNESS WHEREOF, the Parties hereto have set their hands the day and year
first above written.


___________________________             By________________________________
WITNESS                                         Robert A. Crown


                                        SPRINT SPECTRUM, L.P.


___________________________             By________________________________
WITNESS                                         David P. Snyder, Director of
                                                Operations and Engineering
<PAGE>
 
                         EXHIBIT "A-1" TO THE MASTER 

                          BELL ATLANTIC NYNEX MOBILE 

                          SITE LEASE ACKNOWLEDGEMENT
                          --------------------------

This Site Lease Acknowledgement ("SLA") is made and entered into as of this ____
day of __________, 19__ by and between Robert A. Crown, d/b/a CROWN
COMMUNICATIONS hereinafter designated as "Lessor" and SPRINT SPECTRUM, L.P., a
Delaware Limited Partnership hereinafter designed as "Lessee", pursuant and
subject to that certain Agreement ("Agreement") by and between the Parties
hereto, dated as of ___________________, 1996. All capitalized terms have the
meanings ascribed to them in the Agreement.

1.   The Parcel will consist of that certain parcel of property located in the
     City of __________________, the County of ____________________, and the
     State of ____________________, more particularly described as a _________'
     by _______' parcel containing approximately ______ square feet situated
     ______________________________ (add legal description), together with the
     non-exclusive right for ingress and egress, seven (7) days a week, twenty
     four (24) hours a day, on foot or motor vehicle, including trucks, and for
     the installation and maintenance of utility wires,-poles, cables, conduits
     and pipes over, under or along a ________' wide right-of-way extending from
     the nearest public right-of-way, _________________ to the demised premises,
     said premises and right-of-way for access being substantially as described
     herein in Exhibit "1" to the SLA attached hereto and made a part hereof.

2.   Lessee's antenna(s) will consist of _______ antennas, each described in
     terms of type, size, frequency, effective radiated power and height on the
     tower outlined as follows:

     Manufacturer and Type-Number:                _____________________________

                                                  _____________________________

     Number of Antennas:                          _____________________________

     Weight and Dimension of Antenna(s):          _____________________________

     Transmission Line Mfg. and Type No.:         _____________________________
  
     Diameter and Length of Transmission Line:    _____________________________

     Height of Antenna(s) on Tower:               _____________________________

     Direction of Radiation:                      _____________________________

     Equipment Building/Floor Space

       Dimensions:                                _____________________________

     Frequencies/Max Power Output                 _____________________________

3.   The annual lease fee due and payable by Lessee to Lessor is $___________
     per year.

4.   The commencement date of this SLA will be upon commencement of construction
     at the Premises or ninety (90) days from the date hereof, whichever occurs
     first ("Commencement Date"). For purposes of this SLA, any physical
     activity on the Site by Lessee, other than those preliminary activities set
     forth in Article 4 of the Agreement, shall constitute the commencement of
     the construction.
<PAGE>
 
5.   The parties acknowledge that Lessor's rights in the property derive from a
     certain Master Lease Agreement dated December 29, 1995 between Lessor
     herein and Bell Atlantic Nynex Mobile, Inc. ("BANM Master Lease
     Agreement"), a copy of the relevant portions of which has been delivered to
     Lessee. For the purpose of this SLA, the Lessee agrees to abide by the
     applicable provisions of those portions of the BANM Master Lease Agreement
     that have been provided to Lessee and Lessee acknowledges that the terms
     and conditions of the BANM Master Lease Agreement will govern and control
     to the extent there is any discrepancy or inconsistency between the terms
     and conditions of the BANM Master Lease Agreement and this Master Lease
     Agreement. The parties further acknowledge that BANM's rights to the
     property derive from a certain Lease Agreement dated ___________ between
     BANM herein and _______________________ and attached hereto as Exhibit "2"
     to the SLA.

IN WITNESS WHEREOF, the Parties hereto have set their hands the day and year
first above written.


                                        
______________________________          By _________________________________
WITNESS                                          Robert A. Crown


                                        SPRINT SPECTRUM, L.P.


                                        
______________________________          By _________________________________
WITNESS                                          David P. Snyder, Director of
                                                 Engineering and Operations
<PAGE>
 
                                  EXHIBIT A-2

                Memorandum of Site Lease Acknowledgment (Lease)

Site Name:____________________            Site I.D.:________________________

This Memorandum evidences that a lease was made and entered into by written Site
Lease Acknowledgement dated ______________________, 19__ between Crown
Communications, a sole proprietorship ("Owner") and Sprint Spectrum, L.P., a
Delaware limited partnership, the terms and conditions of which are incorporated
herein by reference.

Such agreement provides in part that Owner leases to Sprint Spectrum, L.P. a
certain site ("Site") located on ___________________ within the property of
Owner which is described in Exhibit "A" attached hereto, with grant of easement
for unrestricted rights of access thereto and to electric and telephone
facilities for a term of five (5) years commencing on ____________________, 19__
which term is subject to four (4) additional five (5) year extension periods by
Sprint Spectrum, L.P.

IN WITNESS WHEREOF, the parties have executed the Memorandum as of the day and
year first above written.


OWNER

CROWN COMMUNICATIONS


By:______________________________
     Robert A. Crown

Address:  Penn Center West III, Suite 229           
          Pittsburgh, PA 15276

SPRINT SPECTRUM, L.P.


By:______________________________
     David P. Snyder, Director of
     Operations and Engineering

Address:  Penn Center West II, Suite 200           
          Pittsburgh, PA 15276
<PAGE>
 
                                   EXHIBIT A


                   MEMORANDUM OF SITE LEASE ACKNOWLEDGEMENT

Site Name:________________________                Site I.D.:____________________

Legal Description of Property:
<PAGE>
 
COMMONWEALTH OF PENNSYLVANIA


COUNTY OF_____________________


The foregoing instrument was acknowledged before me this ____ day of __________,
19__, by ROBERT A. CROWN.


___________________________
Notary Public



COMMONWEALTH OF PENNSYLVANIA


COUNTY OF ALLEGHENY


The foregoing instrument was acknowledged before me this ____ day of __________,
19__, by DAVID P. SNYDER, agent on behalf of Sprint Spectrum, L.P., a Delaware 
limited partnership.


___________________________
Notary Public
<PAGE>
 
                               EXHIBIT "B"     
                                       

<TABLE> 
<CAPTION> 
                  Crown Towers/1/                              Annual Lease Fee
                  ------------                                 ----------------
          <S>                                                  <C> 
          Up to four (4) antenna placements                          [*]
          (omni) at any available height.                                     
                                                                              
          Up to six (6) antenna placements at any                    [*]
          available height.                                                   
                                                                              
          Up to nine (9) antenna placements at any                   [*]
          available height.                                                   
                                                                              
               Crown Building Tops/2/                          Annual Lease Fee
               -------------------                             ----------------
                                                                              
          Up to six (6) antenna placements.                          [*]
                                                                              
          Up to nine (9) antenna placements.                         [*]
                                                                              
             BANM Towers or Monopoles/3/                       Annual Lease Fee
             ------------------------                          ----------------
                                                                              
          Up to four (4) antenna placements                          [*]
          (omni) at any available height.                                     
                                                                              
          Up to six (6) antenna placements                           [*]
          at any available height.                                            
                                                                              
          Up to nine (9) antenna placements                          [*]
          at any available height.                                            
</TABLE> 

___________________________

     /1/  Pricing provides for up to a 12' x 20' equipment pad (outside). With
          the exception of Hub Site Space, which is covered in Section 6.6 of
          the Agreement, Lessee may rent a 12' x 10' area inside Lessor's
          equipment building, if available or if required, at an annual rental
          rate of [*].

     /2/  Pricing provides for up to a 12' x 10' area inside building unless
          otherwise specified in SLA.

     /3/  Pricing provides for up to a 12'x 20'equipment pad (outside). Lessee
          may rent a 12'x 10' area inside Lessor's equipment building, if
          available or if required, at an annual rental rate of [*].
               
<PAGE>
 
                                Exhibit "C"    

                              Revision: 4/6/95   
                               SITE STANDARDS  
                               --------------  
1.   GENERAL  

A.   PURPOSE
The purpose of these Site Standards is to create a quality site installation.
These standards are to be in effect for each site at which LESSEE has equipment
in, on or at the site and at which LESSEE has a right to occupy pursuant to the
Agreement to which this document is an attachment.

B.   STATE AND NATIONAL STANDARDS
1.   All installations must conform with all state and national regulations and
     the following state and national codes or any supplements, amendments or
     provisions which supersede them:
     a.   American National Standards Institute:
          ANSI/EAI-222E Structural Standards for Steel Antenna Towers and
          Antenna Supporting Structures
     b.   Federal Aviation Administration Regulations:
          Vol. XI, Part 77 Objects Affecting Navigable Airspace   
          Advisory Circular Obstruction Marking and Lighting AC 70/7460
          Advisory Circular High Intensity Obstruction Lighting Systems AC
          150/5345-43, 
          FAA/DOD Specifications L-856
     c.   Federal Communications Commission Rules and Regulations:
          Code of Federal Construction, Marking and Lighting of Antenna
          Regulations Title 47 Structures Chapter I, Part 17
     d.   National Electrical Code
     e.   Building Officials and Code Administrators International, Inc.
          Basic National Building Code
          Basic National Mechanical Code
          State Building Code
     f.   National Fire Protection Association
          Code 101 - Life Safety
          Code 90A - Air Conditioning and Ventilating Systems   
          Code 110 - Emergency and Standby Power Systems
     g.   State Fire Safety Code
     h.   Occupational Safety and Health Administration           
          Safety and Health Standards (29 CFR 1910) General Industry  
          Subpart R Special Industries
          1910.268 Telecommunications
          1926.510 Subpart M Fall Prevention
     i.   Motorola Grounding Guideline for Cellular Radio Installations,
          Document No. 68P81150E62, 7/23/92 OR AT&T AUTOPLEX(R) Cellular
          Telecommunications Systems, Lightning Protection and Grounding,
          Customer Information Bulletin 148B, August 1990, or latest revision.

C.   GENERAL/APPROVAL
1.   All users shall furnish the following to LESSOR prior to installation of
     any equipment:
     a.   Completed Application. (LESSEE must make new Application to LESSOR for
          change in Antenna position or type.)
     b.   Fully executed SLA.
     c.   Copies of FCC Licenses and construction/building permits.
     d.   Final site plan outlining property boundaries, improvements, easements
          and access.
     e.   Accurate block diagrams showing operating frequencies, all system
          components (active or passive) with gains and losses in dB, along with
          power levels.

2.   The following will not be permitted at the facility without the prior
     written consent of LESSOR.
     a.   Any equipment without FCC type acceptance or equipment which does not
          conform to FCC rules and regulations.
     b.   Add-on power amplifiers.
     c.   "Hybrid" equipment with different manufacturers' RF strips.
     d.   Open rack mounted receivers and transmitters.
<PAGE>
 
     e.   Equipment with crystal oscillator modules which have not been
          temperature compensated.
     f.   Digital/analog hybriding in exciters, unless type-accepted.
     g.   Non-continuous duty rated transmitters used in continuous duty
          applications.
     h.   Transmitter outputs without a harmonic filter and antenna matching
          circuitry.
     i.   Change in operating frequency(ies).
     j.   Ferrite devices looking directly at an antenna.
     k.   Nickel plated connectors.
     l.   Cascaded receiver multicouplers/preamps.

3.   All emergencies are to be reported immediately to 1-800-852-2671.

D.   LIABILITY
It shall be the responsibility of the LESSEE to comply with all of the site
standards set forth herein. The LESSEE specifically agrees to indemnify and hold
harmless the LESSOR against any claim of liability, loss, damage or costs
including reasonable attorney's fees, arising out of or resulting from LESSEE's
non-compliance with the standards set forth herein.

E.   INSPECTION
LESSOR reserves the right to inspect LESSEE's area without prior notice at any
time during the term of the Agreement in order to ensure compliance with the
standards set forth herein. Any such inspection shall be solely for the benefit
and use of the LESSOR and does not constitute any approval of or acquiescence
to the conditions that might be revealed during the course of the inspection.

LESSOR reserves the right to inspect LESSOR's area without prior notice.

F.   DISCLAIMER OF RESPONSIBILITY
It is the intention of LESSOR and LESSEE that the standards set forth herein are
part of the Agreement between them. It is specifically agreed that they are not
intended to be relied upon or to benefit any third party. Further, the LESSOR
shall have no liability or responsibility to any third party as a result of the
establishment of the standards set forth herein, any inspection by the LESSOR of
LESSEE's area in order to determine compliance with the standards, the
sufficiency or lack of sufficiency of the standards, or LESSEE's compliance or
non-compliance with the standards and the LESSEE agrees to indemnify and hold
harmless the LESSOR against any claim by a third party resulting from such
theories.

II.  RADIO FREQUENCY INTERFERENCE PROTECTIVE DEVICES
A.   If due to LESSEE's use or proposed use, there exists any change to the RF
     environment it will be at LESSOR's sole discretion to require any or all of
     the following:
1.   IM protection panels can be installed in lieu of separate cavity and
isolator configurations. LESSOR approval required.
2.   30-76 Mhz
     - Isolators required
     - TX output cavity - minimum of 20 Db rejection @ plus or minus 5 Mhz
3.   130-174 Mhz
     - Isolators - minimum of 30 Db with bandpass cavity
4.   406-512 Mhz
     - Isolators - minimum of 60 Db with bandpass cavity
5.   806-866 Mhz
     - Isolators - minimum of 60 Db with bandpass cavity
6.   866 Mhz and above - as determined by LESSOR.

B.   Additional protective devices may be required based upon LESSOR's
     evaluation of the following information:
1.   Theoretical Transmitter (TX) mixes.
2.   Antenna location and type
3.   Combiner/multicoupler configurations
4.   Transmitter specifications
5.   Receiver specifications
6.   Historical problems
7.   Transmitter to transmitter isolation
8.   Transmitter to antenna isolation
9.   Transmitter to receiver isolation
10.  Calculated and measured level of Intermodulative (IM) products
11.  Transmitter output power
12.  Transmitter Effective Radiated Power (ERP)
<PAGE>
 
13.  Spectrum analyzer measurements
14.  Voltage Standing Wave Radio (VSWR) measurements
15.  Existing cavity selectivity

C.   LESSEE will be required within a reasonable period to correct excessive
     cabinet leakage which causes interference to other tenants.

III. ANTENNAS AND ANTENNA MOUNTS
A.   All mounting hardware to be utilized by LESSEE to be as specified by tower
     manufacturer and approved by LESSOR.
B.   Connections to be taped with stretch vinyl tape (Scotch #33-T or
     equivalent) and Scotchkoted or equivalent (including booted pigtails).
C.   Must meet manufacturer's VSWR specifications.
D.   Any corroded elements must be repaired or replaced.
E.   Must be DC grounded type, or have the appropriate lightning protection as
     determined by LESSOR.
F.   No welding or drilling on mounts will be permitted.
G.   All antennas must be encased in fiberglass radomes and be painted or
     impregnated with a color designated by LESSOR as the standard antenna color
     for aesthetic uniformity.

IV.  CABLE
A.   All antenna lines to be approved by LESSOR, which approval shall not be
     unreasonably withheld or delayed.
B.   All transmission line(s) will be installed and maintained to avoid kinking
     and/or cracking.
C.   Tagged with weatherproof labels showing manufacturer, model, and owner's
     name at both ends of cable run.
D.   Any cable fasteners exposed to weather must be stainless steel.
E.   All interconnecting cables/jumpers must have shielded outer conductor and
     approved by LESSOR, which approval shall not be unreasonably withheld or
     delayed.
F.   Internally, all cable must be run in troughs or on cable trays and on cable
     or waveguide bridges at intervals of no less than 3'. Externally, all cable
     must be attached with stainless steel hangers and non-corrosive hardware.
G.   All unused lines must be tagged at both ends showing termination points
     with the appropriate impedance termination at each end.
H.   All AC line cords must be 3 conductor with grounding plugs.
I.   All antenna transmission lines shall be grounded at both the antenna and
     equipment ends at the equipment ends and at building entry point, with the
     appropriate grounding kits.
J.   All cables running to and from the exterior of the cabinet must be 100%
     ground shielded. Preferred cables are: Heliax, Superflex or braided grounds
     with foil wrap.

V.   CONNECTORS
A.   Must be Teflon filled, UHF or N type, including chassis/bulkhead
     connectors.
B.   Must be properly fabricated (soldered if applicable) if field installed.
C.   Must be taped and Scotchkoted or equivalent at least 4" onto jacket if
     exposed to weather.
D.   Male pins must be of proper length according to manufacturer's
     specifications.
E.   Female contacts may not be spread.
F.   Connectors must be pliers tight as opposed to hand tight.
G.   Must be silver plated or brass.
H.   Must be electrically and mechanically equivalent to Original Equipment
     Manufacturers (OEM) connectors.

VI.  RECEIVERS
A.   No RF preamps permitted in front end unless authorized by LESSOR.
B.   All RF shielding must be in place.
C.   VHF frequencies and higher must use helical resonator front ends.
D.   Must meet manufacturer's specifications, particularly with regard to
     bandwidth, discriminator, swing and symmetry, and spurious responses.
E.   Crystal filters/pre-selectors/cavities must be installed in RX legs where
     appropriate.
F.   All repeater tone squelch circuitry must use "AND" logic.

VII. TRANSMITTERS
A.   Must meet original manufacturer's specifications.
B.   All RF shielding must be in place.
C.   Must have a visual indicator of transmitter operation.
D.   Must be tagged with LESSEE's name, equipment model number, serial number,
     and operating frequency(ies).
E.   All low-level, pre-driver and driver stages in exciter must be shielded.
<PAGE>
 
F.     All power amplifiers must be shielded.
G.     Output power may not exceed that specified on LESSEE's FCC License.

VIII.  COMBINERS/MULTICOUPLERS
A.     Shall at all times meet manufacturer's specifications.
B.     Must be tuned using manufacturer approval procedures.
C.     Must provide a minimum of 60 Db transmitter to transmitter isolation.

IX.    CABINETS
A.     All cabinets must be bonded together and to the equipment building ground
       system.
B.     All doors must be secured.
C.     All non-original holes larger than 1" must be covered with copper screen
       or solid metal plates.
D.     Current license for all operating frequencies should be mounted on the
       cabinet exterior for display at all times.

X.     INSTALLATION PROCEDURES
A.     Any tower work must be scheduled with LESSOR using only LESSOR approved
       contractors at least 48 hours in advance of site work. LESSOR's approval
       shall not be unreasonably withheld or delayed. LESSEE will be responsible
       for any and all fees associated with said work.
B.     Installation may take place only after LESSOR has been notified of the
       date and time in writing, and only during normal working hours unless
       otherwise authorized beforehand.
C.     Equipment may not be operated until final inspection of installation by
       LESSOR, which shall not be unreasonably withheld or delayed.
D.     Any testing periods are to be approved in advance by LESSOR and within
       the parameters as defined by LESSOR. LESSOR's approval shall not be
       unreasonably withheld or delayed.

XI.    MAINTENANCE/TUNING PROCEDURES
A.     All external indicator lamps/LED's must be working.
B.     Equipment parameters must meet manufacturer's specifications.
C.     All cover, shield, and rack fasteners must be in place and securely
       tightened.
D.     Local speakers and/or orderwire systems must be turned off except during
       service, testing or other maintenance operations.

XII.   INTERFERENCE DIAGNOSTIC PROCEDURES      
       The LESSEE must cooperate immediately with LESSOR when called upon to
       investigate a source of interference, whether or not it can be
       conclusively proven that LESSEE's equipment is involved.

XIII.  TOWER
       This section deals with items which are to be mounted on, attached to or
       affixed to the tower.

A.     ICE SHIELDS
       At LESSOR's sole discretion, protective ice shields may be required and
       manufacturer of ice shield will be determined by LESSOR.

B.     CLIMBING BOLTS AND LADDERS
       All attachments made to the tower shall be made in such a manner as not
       to cause any safety hazard to other users or cause any restriction of
       movement on, or to any climbing ladders, leg step bolts or safety cables
       provided.

C.     BRIDGE
1.     Installation of a cable bridge shall be at LESSOR's sole discretion and
       with LESSOR's approval. LESSOR's approval shall not be unreasonably
       withheld or delayed .
2.     If required, and in accordance with the manufacturers recommendations for
       the spacing of supports on horizontal runs for the particular type of
       cable or waveguide, the cable or waveguide shall be secured to the
       brackets on the bridge using clamps and hardware specifically
       manufactured for that purpose.
3.     No cable or waveguide run shall be clamped, tied or in any way affixed to
       a run belonging to LESSOR or any another licensee/lessee.

D.     CABLE LADDER AND WAVEGUIDE
1.     LESSEE shall install a ladder for the vertical routing of cable and
       waveguide. From the horizontal to vertical transition at the point where
       the bridge meets the tower to the point at which the cable or waveguide
       must leave the bridge to route to the antenna, all cable and waveguide is
       to be attached to the ladder in accordance with the recommendations of
       the manufacturer of the cable or waveguide.
         
<PAGE>
 
2.   No cable or waveguide run shall be clamped, tied or any way affixed to a
     run belonging to LESSOR or any another licensee/lessee.

E.   DISTRIBUTION RUNS
1.   Cable or waveguide runs from the cable ladder to the point at which they
     connect to the antenna shall be routed along tower members in a manner
     producing a neat and professional site appearance.
2.   Cable and/or waveguide runs shall be specifically routed so as not to
     impede the safe use of the tower leg or climbing bolts, or to restrict the
     access of LESSOR or any another licensee/lessee.
3.   Distribution runs shall be clamped to the tower in accordance with the
     recommendations of the manufacturer of the cable or waveguide.
4.   No cable or waveguide run shall be clamped, tied or in any way affixed to a
     run belonging to LESSOR or any another licensee/lessee.

F.   LENGTHS
1.   Cable and/or waveguide runs shall not be longer than necessary to provide a
     proper connection and normal maintenance and operation.
2.   No coiled lengths shall be permitted on the tower, bridge or on the ground.

G.   ENTRY
1.   Entry of the cable or waveguide to the interior of the shelter shall be via
     ports provided in the shelter wall.
2.   Cable and/or waveguide entering a port shall be provided with a boot to 
     seal the port; the boot shall be a Microflect or equivalent commercial 
     product made specifically for the type of cable or waveguide and for
     diameter of the entry port, and approved by LESSOR before installation. It
     shall be installed in accordance with the instructions of the manufacturer
     and the port shall be sealed against the intrusion of moisture.

XIV. EQUIPMENT LOCATED WITHIN LESSOR'S EQUIPMENT BUILDING
A.   EQUIPMENT INSTALLATION REQUIREMENTS
1.   Any mounting to walls either outside or inside LESSOR's building must be
     pre-approved by LESSOR, which approval shall not be unreasonably withheld
     or delayed.
2.   All racks and equipment are to be plumb and true with the walls and floor
     of the shelter and reflect an installation consistent with the electrical
     and operational requirements of the equipment and appearance standards of a
     professional installation.
3.   Racks are to be bolted to the floor and aligned on the center line as in
     the site drawing provided to the LESSOR.
4.   Racks are not to be attached to the cable trays.

B.   TRANSMISSION LINES AND/OR WAVEGUIDE ROUTING
1.   Cable trays and/or troughs are required within the shelter for the routing
     of cable and waveguide to the equipment racks and termination points.
2.   All cable and waveguide shall be placed and secured to the cable tray.

C.   LENGTHS
1.   Cable and/or waveguide runs in the equipment shelter shall not be longer
     than necessary in order to provide a proper connection.
2.   While adequate slack for purposes of maintenance and operation is
     permitted, no coiled lengths on the tray or elsewhere in the shelter are
     permitted for normal maintenance and operation.

XV.  GROUNDING
1.   The LESSEE must adhere to either the Motorola or AT&T grounding
     specification outlined above based on LESSOR's equipment at facility.
2.   All exterior grounding shall be C.A.D. welding.
3.   All antennas shall be bonded to the tower.
4.   Cable and waveguide shall be grounded as a minimum at three specific
     points, and for vertical runs in excess of 200 feet at intermediate points.
5.   All cable and waveguide shall be grounded to the tower at the point where
     the run effectively breaks from the tower for its connection to the
     antenna, using clamps and hardware specifically manufactured for that
     purpose.
6.   On the vertical portion of the cable or waveguide run, just above where it
     starts to make its transition from a vertical tower to a horizontal bridge
     run, all cable and waveguide shall be grounded to the tower using clamps
     and hardware specifically manufactured for that purpose.
7.   On the exterior of each shelter, at a point near the entry ports, a
     grounding plate must be provided for terminating ground leads brought from
     the cable and waveguide. Each cable and waveguide run shall be grounded at
     this point using clamps and hardware specifically manufactured for that
     purpose.
<PAGE>
 
8.      On cable and waveguide installations where the vertical tower length
        exceeds 200 feet, the run shall be grounded at equally spaced
        intermediate points along the length of the run so as not to have a
        distance between grounding points longer than 100 feet.
9.      Cable and waveguide grounding leads shall connect to a separate point
        for each run to the common ground point.
10.     Grounding straps shall be kept to a minimum length and as near as
        possible to vertical down lead and shall be consistent with the
        restraints of protective dress and access.
11.     Grounding plates must be provided for single point access to the site
        grounding system. Each rack shall have a properly sized, insulated
        ground lead from the rack safety and signal grounds to one of the
        grounding points on the ground plate.
12.     The insulated ground lead shall follow the route of and be placed in the
        cable tray.
13.     Each rack shall be separately grounded.
14.     All modifications to grounding system must meet LESSOR's impedance
        specification.

XVI.    ELECTRICAL
1.      Power requirements must be approved, in advance by LESSOR.
2.      Polarized electrical outlets should be installed for all transmitters
        when possible.
3.      Surge protection is required for all base stations.

XVII.   ELECTRICAL DISTRIBUTION
        All electrical wiring from the distribution breaker panel shall be via
        rigid metal conduit, thin wall, routed along the under side of the cable
        tray to a point directly above the equipment rack. From this point,
        LESSEE may select how to distribute to its equipment or rack.

XVIII.  TEMPORARY LOADS
1.      Test equipment, soldering irons or other equipment serving a test or
        repair function may be used only if the total load connected to any
        single dual receptacle does not exceed 15 amps.
2.      Test equipment to be in place for more than seven (7) days will require
        prior approval of the LESSOR, which approval shall not be unreasonably
        withheld or delayed.

XIX.    HEATING, VENTILATING, AND AIR CONDITIONING
        Any additional equipment or equipment upgrade having a greater heat
        dissipation requirement than the existing system will be the
        responsibility of the LESSEE and if different than specified in the
        Application can not be installed without the prior approval of the
        LESSOR, which approval shall not be unreasonably withheld or delayed.

XX.     DOORS
        Equipment building doors shall be kept closed at all times unless when
        actually moving equipment in or out.

XXI.    SITE APPEARANCE
1.      Services to maintain the appearance and integrity of the site will be
        provided by the LESSOR and will include scheduled cleaning of the
        shelter interiors.
2.      Each licensee/lessee is expected and required to remove from the site
        all trash, dirt and other materials brought into the shelter, or onto
        the site during their installation and maintenance efforts.
3.      No food or drink is allowed within the equipment shelter.
4.      No smoking is allowed on the tower site.

XXII.   STORAGE      
        No parts or material may be stored on site by LESSEE.

XXIII.  DAMAGE
        LESSEE shall report to LESSOR any damage to any item of the facility,
        structure, component or equipment, whether or not caused by LESSEE.

XXIV.   REPORTING ON SITE
1.      Personnel on site shall be required to communicate with the LESSOR by
        calling (412) 788-0906 and report their arrival on site, identity,
        purpose, expected and actual departure times.
2.      Emergency 24 hour contact number(s) must be displayed on outside of
        equipment cabinet/building.
<PAGE>
 
                                   Exhibit D

<TABLE> 
<CAPTION> 
- --------------------------------------------------------------------------------
                                                  Antenna              Site
     Crown No.      Common Name                 Height (ft)        Configuration
- --------------------------------------------------------------------------------
<S>              <C>                            <C>                <C> 
BANM             Whitehall                          120               Sector 
Echo 003         Monroeville                        220               Sector
Echo 004         Cranberry                          250               Omni 
Echo 006         Robinson Township                  160               Sector 
Echo 008         Kittanning                         250               Omni 
Echo 0llC        Airport                            120               Sector 
Echo 012         Washington                         220               Sector
Echo 015         Greensburg                         150               Sector
Echo 017         Beaver                             500               Sector 
Echo 018         Canonsburg                         180               Sector 
Echo 020/034     South Fayette                      300               Sector 
Echo 023         Glassport                          200               Sector
Echo 028         New Castle                         262               Sector
Echo 030         Carnegie                           150               Sector 
Echo 032         Freeport                           250               Omni
Echo 039         Star Lake                          262               Omni
Echo 040         North Park                         120               Sector 
Echo 041         Claysville                         250               Omni 
Echo 043         Level Green                        225               Omni
Echo 044         Mt. Pleasant                       225               Omni   
Echo 046         Latrobe                            300               Omni
Echo 049         Blairsville                        225               Omni   
Echo 051         Ellwood City                       262               Omni   
Echo 053         Uniontown 11                       295               Omni 
Echo 054         Coraopolis                         250               Sector 
Echo 057         Moraine State Park                 250               Omni
Echo 060         New Alexandria                     300               Omni
Echo 069         Charleroi                          300               Omni
Echo 077         South Park                         250               Sector  
Echo 082         West End                           120               Sector
Echo 090         Towne North Towers                 100               Sector 
Echo 094         Upper St. Clair                    150               Sector
Echo 111         Old Kane Hospital                  115               Sector 
Echo MB002       Aliquippa                          220               Omni   
Echo MB004       New Stanton                        165               Omni  
Echo MB005       Trax Farms                         240               Sector 
Echo MB008       Cooperstown                        180               Sector 
Echo MB014       Waltersburg                        260               Omni
Echo MB036       Sheraden                            75               Sector
Echo MB038       East Liberty                        50               Sector 
Echo MB041       Hopewell                           100               Sector
Echo MB042       Imperial                           210               Sector
Echo MB048       Delmont                            225               Omni   
Echo M8050       Rostraver                          200               Omni
Echo MB053       Amwell                             250               Omni   
Echo MB065       Turtle Creek                       200               Sector   
Echo MBO66       West Newton                        225               Omni
Echo M6068       P54-2B-1 BAMS Yukon                220               Omni
Echo MB071       84PA                               225               Omni   
Echo M8085       Cecil                              225               Sector
Echo MB092       Buenola                            250               Omni   
Echo MB098       West Mifflin                       110               Sector   
Echo MB103       Arona                              190               Omni   
Echo MB106       Connellsville                      285               Omni
Echo MB108       Zelienople                         250               Omni
Echo MB112       White Oak                          130               Sector
Echo MB116       Mamont                             300               Omni     
                 Century Building                   160               Sector

58 Total Sites
- --------------------------------------------------------------------------------
</TABLE> 
<PAGE>
 
                            EXHIBIT "2" to the SLA

                             PRIME LEASE AGREEMENT
<PAGE>
 
                   EXHIBIT "C" to the Master Lease Agreement
                                   (1 of 2)

<TABLE> 
<CAPTION> 
Site Number and Name                  Height          Height               
- --------------------                  ------          ------               
                                     Requested       Available             
                                     ---------       ---------             
<S>            <C>                   <C>             <C>      
MB05           McMurray                200'             150'               
MB08           Cooperstown             195'             225'               
MB09           West Winfield           250'             250'               
MB13           Perryopolis             200'             200'               
MB14           Waltersburg             250'             230'               
MB36           Sheradon                117'             90' (1)            
MB39           Penn Hills              117'             90' (1)            
MB41           Hopewell                117'             90' (1)            
MB42           Imperial                117'             180' on new 250' tower
MB43           Murrysville             117'             120'               
MB44           Wall                    167'             90' (1)            
MB47           Jefferson               250'             100'               
MB48           Delmont                 250'             (2)                
MB50           Rostraver               230'             170'               
MB52           Gibsonia                177'             (3)                
MB57           Eastvale                ***              (3)                
MB59           Whitehall               150'             120'               
MB60           Etna                    152'             120' (1)           
MB62           Charleroi               200'             200'               
MB66           West Newton             200'             200'               
MB67           Indianola               155'             (3)                
Echo 1         Crane                   300'             295'               
Echo 2         Bluebell                300'             275'               
Echo 3         Monroeville             350'             350'               
Echo 4         Cranberry               300'             305'               
Echo 5         Clark Building          Top              Rooftop            
Echo 8         Kittanning              300'             285' or 340'       
Echo 11 A      Airport                  84'             70'                
Echo 12        Washington              300'             350'               
Echo 14        Butler                  250'             250'               
Echo 15        Greensburg              300'             300'               
Echo 16        Zelienople              300'             300'               
Echo 17        Beaver                  300'             300'               
Echo 18        Canonsburg              250'             150'               
Echo 23        Glassport               250'             250'               
Echo 26        Oakland                 200'             (3)                
Echo 29        Connellsville           300'             300'               
Echo 30        Carnegie                300'             300'               
Echo 32        Freeport                250'             (3)                
Echo 38        North Braddock          250'             250'               
Echo 39        Star Lake               200'             200'               
Echo 40        North Park              300'             300'               
Echo 43        Level Green             250'             250'               
Echo 45        Calvary                 300'             300'               
Echo 46        Latrobe                 250'             250'                
</TABLE> 
<PAGE>
 
                   EXHIBIT "C" to the Master Lease Agreement
                                   (2 of 2)

<TABLE> 
<CAPTION> 
Site Number and Name                     Height             Height  
- --------------------                     ------             ------   
                                        Requested          Available 
                                        ---------          ---------
<S>        <C>                          <C>                <C>      
Echo 47    Bethel Park                     300'               (3)
Echo 53    Uniontown II                    250'               250'
Echo 54    Coraopolis                      300'               (3)
Echo 57    Moraine                         300'               300'
Echo 62    Youngwood                       200'               200' 
Echo 65    North Huntingdon                300'               (3)
Echo 89    North Fayette                   250'               (3)
Echo 90    Town North Towers               300'               Building top 85'
Echo 91    Glenfield                       300'               (3)
Echo 94    Upper St. Clair                 300'               300'
Echo 99    Bavington                       200'               200'
Echo 101   Aliquippa                       200'               200'
Echo ME01  Bentleyville                    200'               200'
</TABLE> 

(1)  These Heights are currently available; however, we are engaged in zoning
     proceedings to raise these tower heights to 180'. If we are able to raise
     these tower heights, NEXTEL would be able to locate at the 150' level.

(2)  This tower is not available. CROWN has constructed the following facility
     as a back-up to Echo MB48:

     Echo 61/Delmont
     40 degrees 22' 31"
     70 degrees 33' 55"
     Ground Elevation  1,515  
     Tower Height      180'  
     Available Height  180'

(3)  These are problem sites for which we currently are working on a back-up or
     we are engaged in zoning proceedings to obtain permits. As soon as we have
     exact coordinates, we will forward them to you.

Searches have also been issued for the following areas:

Echo 112    Mon Valley
Echo 113    Unionville
Echo 114    Hahntown
Echo 115    Church Hill
Echo 116    East Washington
Echo 117    Bradford Woods
Echo 118    Lake Arthur
Echo 119    Glass More
Echo 120    Mount Chesnut
<PAGE>
 
                   EXHIBIT "D" to the Master Lease Agreement

<TABLE> 
<CAPTION> 
              Crown                                       Annual Lease Fee 
              -----                                       ----------------
     <S>                                                  <C> 
     Up to three (3) antenna placements                         [*]
     (omni) at any available height. 

     Up to nine (9) antenna placements at any                   [*]
     available height.

<CAPTION> 
          BANM Facilities                                 Annual Lease Fee  
          ---------------                                 ----------------
     <S>                                                  <C> 
     Up to three (3) antenna placements                         [*]
     (omni) at any available height.  

     Up to nine (9) antenna placements                          [*]
     at any available height.
</TABLE> 

     The above pricing includes, unless otherwise specified in the SLA, for up
to a 10'x 20' area inside a CROWN equipment building. In the event CROWN is
unable to provide the entire allotted 10'x 20' area, NEXTEL shall receive a rent
credit in the amount of [*] for each square foot of building space CROWN is
not able to provide to NEXTEL.

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.


<PAGE>
 
                   EXHIBIT "E" to the Master Lease Agreement

                           SITE DEVELOPMENT SERVICES
                           -------------------------

     -    Identify Site locations with NEXTEL.

     -    Identify and plan space available to NEXTEL in equipment buildings
          and document the layout via CAD drawings.

     -    Verify antenna positions and run intermodulation studies.

     -    Supply NEXTEL with a listing of all materials needed for each
          installation.

     -    Provide a floor plan of the layout for each Site to be approved by
          NEXTEL.
<PAGE>
 
 
                   EXHIBIT "F" to the Master Lease Agreement

                              Revision:__________

                                SITE STANDARDS
                                --------------

I    GENERAL

     A.   PURPOSE
          The purpose of these Site Standards is to create a quality site
          installation. These standards are to be in effect for each site at
          which NEXTEL has equipment in, on or at the site and at which NEXTEL
          has a right to occupy pursuant to the lease to which this document is
          an attachment.

     B.   STATE AND NATIONAL STANDARDS

     1.   All installations must conform with all state and national regulations
          and the following state and national codes or any supplements,
          amendments or provisions which supersede them:

          a.   American National Standards Institute:
               ANSI/EAI-222E Structural Standards for Steel Antenna Towers and
               Antenna Supporting Structures
          b.   Federal Aviation Administration Regulations:
               Vol. XI, Part 77 Objects Affecting Navigable Airspace
               Advisory Circular Obstruction Marking and Lighting AC 70/7460
               Advisory Circular High Intensity Obstruction Lighting Systems AC
               150/5345-43, FAA/DOD Specifications L-856
          c.   Federal Communications Commission Rules and Regulations:
               Code of Federal Construction, Marking and Lighting of Antenna
               Regulations Title 47 Structures Chapter I, Part 17
          d.   National Electrical Code
          e.   Building Officials and Code Administrators International, Inc.
               Basic National Building Code
               Basic National Mechanical Code
               State Building Code
          f.   National Fire Protection Association
               Code 101 - Life Safety
               Code 90A - Air Conditioning and Ventilating Systems         
               Code 110 - Emergency and Standby Power Systems
          g.   State Fire Safety Code
          h.   Occupational Safety and Health Administration          
               Safety and Health Standards (29 CFR 1910) General Industry
               Subpart R Special Industries
               1910.268 Telecommunications
               1926.510 Subpart M Fall Prevention
          i.   Motorola Grounding Guideline for Cellular Radio Installations,
               Document No. 68P81150E62, 7/23/92 OR AT&T AUTOPLEX(R) Cellular
               Telecommunications Systems, Lightning Protection and Grounding,
               Customer Information Bulletin 148B, August 1990, or latest
               revision. 
<PAGE>
 
     C.   GENERAL/APPROVAL

     1.        All users shall furnish the following to CROWN prior to
               installation of any equipment:
          a.   Completed Application. (NEXTEL must make new Application to CROWN
               for change in Antenna position or type
          b.   Fully executed supplement.
          c.   Copies of FCC Licenses and construction/building permits.
          d.   Final site plan outlining property boundaries, improvements,
               easements and access.
          e.   Accurate block diagrams showing operating frequencies, all system
               components (active or passive) with gains and losses in dB, along
               with power levels.

     2.   The following will not be permitted at the facility without the prior
          written consent of CROWN.

          a.   Any equipment without FCC type acceptance or equipment which does
               not conform to FCC rules and regulations.
          b.   Add-on power amplifiers.
          c.   "Hybrid" equipment with different manufacturers' RF strips.
          d.   Open rack mounted receivers and transmitters.
          e.   Equipment with crystal oscillator modules which have not been
               temperature compensated.
          f.   Digital/analog hybriding in exciters, unless type-accepted.
          g.   Non-continuous duty rated transmitters used in continuous duty
               applications.
          h.   Transmitter outputs without a harmonic filter and antenna
               matching circuitry.
          i.   Change in operating frequency(ies).
          j.   Ferrite devices looking directly at an antenna.
          k.   Nickel plated connectors.
          l.   Cascaded receiver multicouplers/preamps.

     3.   All emergencies are to be reported immediately to 1-800-852-2671.

     D.   LIABILITY

          It shall be the responsibility of NEXTEL to comply with all of the
          site standards set forth herein. NEXTEL specifically agrees to
          indemnify and hold harmless CROWN against any claim of liability,
          loss, damage or costs including reasonable attorneys' fees, arising
          out of or resulting from NEXTEL's non-compliance with the standards
          set forth herein.

     E.   INSPECTION

          CROWN reserves the right to inspect NEXTEL's area without prior notice
          at any time during the term of the Agreement in order to ensure
          compliance with the standards set forth herein. Any such inspection
          shall be solely for the benefit and use of CROWN and does not
          constitute any approval of or acquiescence to the conditions that
          might be revealed during the course of the inspection.
<PAGE>
 
          CROWN reserves the right to inspect CROWN's area without prior notice.

     F.   DISCLAIMER OF RESPONSIBILITY

          It is the intention of CROWN and NEXTEL that the standards set forth
          herein are part of the Agreement between them. It is specifically
          agreed that they are not intended to be relied upon or to benefit any
          third party. Further, CROWN shall have no liability or responsibility
          to any third party as a result of the establishment of the standards
          set forth herein, any inspection by CROWN of NEXTEL's area in order to
          determine compliance with the standards, the sufficiency or lack of
          sufficiency of the standards, or NEXTEL's compliance or non-compliance
          with the standards and NEXTEL agrees to indemnify and hold harmless
          CROWN against any claim by a third party resulting from such theories.

     G.   NOTICES

          All contacts or notices required or permitted by NEXTEL pursuant to
          these Site Standards shall be provided in writing to CROWN's
          Director - Operations or his or her designee and any approval or
          consent by CROWN shall only be effective if executed in writing by
          CROWN's Director - Operations or his or her designee.

II   RADIO FREQUENCY INTERFERENCE PROTECTIVE DEVICES

     A.   If due to NEXTEL's use or proposed use, there exists any change to the
          RF environment it will be at CROWN's sole discretion to require any or
          all of the following:
     1.   IM protection panels can be installed in lieu of separate cavity and
          isolator configurations. CROWN approval required.
     2.   30-76 Mhz
          - Isolators required
          - TX output cavity - minimum of 20 Db rejection @ plus or minus 5 Mhz
     3.   130-174 Mhz
          - Isolators - minimum of 30 Db with bandpass cavity
     4.   406-512 Mhz
          - Isolators - minimum of 60 Db with bandpass cavity
     5.   806-866 Mhz
          - Isolators - minimum of 60 Db with bandpass cavity
     6.   866 Mhz and above - as determined by CROWN.

     B.   Additional protective devices may be required based upon CROWN's
          evaluation of the following information:
     1.   Theoretical Transmitter (TX) mixes.
     2.   Antenna location and type
     3.   Combiner/multicoupler configurations
     4.   Transmitter specifications
     5.   Receiver specifications
     6.   Historical problems
     7.   Transmitter to transmitter isolation
     8.   Transmitter to antenna isolation
<PAGE>
 
     9.   Transmitter to receiver isolation
     10.  Calculated and measured level of Intermodulative (IM) products
     11.  Transmitter output power
     12.  Transmitter Effective Radiated Power (ERP)
     13.  Spectrum analyzer measurements
     14.  Voltage Standing Wave Radio (VSWR) measurements
     15.  Existing cavity selectivity

     C.   NEXTEL will be required to immediately correct excessive cabinet
          leakage which causes interference to other tenants.

     III. ANTENNAS AND ANTENNA MOUNTS

     A.   All mounting hardware to be utilized by NEXTEL to be as specified by
          tower manufacturer and approved by CROWN.
     B.   Connections to be taped with stretch vinyl tape (Scotch #33-T or
          equivalent) and Scotchkoted or equivalent (including booted pigtails).
     C.   Must meet manufacturer's VSWR specifications.
     D.   Any corroded elements must be repaired or replaced.
     E.   Must be DC grounded type, or have the appropriate lightning protection
          as determined by CROWN.
     F.   No welding or drilling on mounts will be permitted.
     G.   All antennas must be encased in fiberglass radomes and be painted or
          impregnated with a color designated by CROWN as the standard antenna
          color for aesthetic uniformity.

     IV.  CABLE

     A.   All antenna lines to be approved by CROWN.
     B.   All transmission line(s) will be installed and maintained to avoid
          kinking and/or cracking.
     C.   Tagged with weatherproof labels showing manufacturer, model, and
          owner's name at both ends of cable run.
     D.   Any cable fasteners exposed to weather must be stainless steel.
     E.   All interconnecting cables/jumpers must have shielded outer conductor
          and approved by CROWN.
     F.   Internally, all cable must be run in troughs or on cable trays and on
          cable or waveguide bridges at intervals of no less than 3'.
          Externally, all cable must be attached with stainless steel hangers
          and non-corrosive hardware.
     G.   All unused lines must be tagged at both ends showing termination
          points with the appropriate impedance termination at each end.
     H.   All AC line cords must be 3 conductor with grounding plugs.
     I.   All antenna transmission lines shall be grounded at both the antenna
          and equipment ends at the equipment ends and at building entry point,
          with the appropriate grounding kits.
     J.   All cables running to and from the exterior of the cabinet must be
          100% ground shielded. Preferred cables are: Heliax, Superflex or
          braided grounds with foil wrap.
<PAGE>
 
     V.    CONNECTORS

     A.    Must be Teflon filled, UHF or N type, including chassis/bulkhead
           connectors.
     B.    Must be properly fabricated (soldered if applicable) if field
           installed.
     C.    Must be taped and Scotchkoted or equivalent at least 4" onto jacket
           if exposed to weather.
     D.    Male pins must be of proper length according to manufacturer's
           specifications.
     E.    Female contacts may not be spread.
     F.    Connectors must be pliers tight as opposed to hand tight.
     G.    Must be silver plated or brass.
     H.    Must be electrically and mechanically equivalent to Original
           Equipment Manufacturers (OEM) connectors.

     VI.   RECEIVERS

     A.    No RF preamps permitted in front end unless authorized by CROWN.
     B.    All RF shielding must be in place.
     C.    VHF frequencies and higher must use helical resonator front ends.
     D.    Must meet manufacturer's specifications, particularly with regard to
           bandwidth, discriminator, swing and symmetry, and spurious responses.
     E.    Crystal filters/pre-selectors/cavities must be installed in RX legs
           where appropriate.
     F.    All repeater tone squelch circuitry must use "AND" logic.

     VII.  TRANSMITTERS

     A.    Must meet original manufacturer's specifications.
     B.    All RF shielding must be in place.
     C.    Must have a visual indicator of transmitter operation.
     D.    Must be tagged with NEXTEL's name, equipment model number, serial
           number, and operating frequency(ies).
     E.    All low-level, pre-driver and driver stages in exciter must be
           shielded.
     F.    All power amplifiers must be shielded.
     G.    Output power may not exceed that specified on NEXTEL's FCC License.

     VIII. COMBINERS/MULTICOUPLERS

     A.    Shall at all times meet manufacturer's specifications.
     B.    Must be tuned using manufacturer approval procedures.
     C.    Must provide a minimum of 60 Db transmitter to transmitter isolation.

     IX.   CABINETS

     A.    All cabinets must be bonded together and to the equipment building
           ground system.
     B.    All doors must be secured.
     C.    All non-original holes larger than 1" must be covered with copper
           screen or solid metal plates.
     D.    Current license for all operating frequencies should be mounted on
           the cabinet exterior for display at all times.
<PAGE>
 
     X.    INSTALLATION PROCEDURES

     A.    Any tower work must be scheduled with CROWN using only CROWN approved
           contractors at least 48 hours in advance of site work. NEXTEL will be
           responsible for any and all fees associated with said work.
     B.    Installation may take place only after CROWN has been notified of the
           date and time in writing, and only during normal working hours unless
           otherwise authorized beforehand.
     C.    Equipment may not be operated until final inspection of installation
           by CROWN, which shall not be unreasonably withheld.
     D.    Any testing periods are to be approved in advance by CROWN and within
           the parameters as defined by CROWN.

     XI    MAINTENANCE/TUNING PROCEDURES

     A.    All external indicator lamps/LED's must be working.
     B.    Equipment parameters must meet manufacturer's specifications.
     C.    All cover, shield, and rack fasteners must be in place and securely
           tightened.
     D.    Local speakers and/or orderwire systems must be turned off except
           during service, testing or other maintenance operations.

     XII.  INTERFERENCE DIAGNOSTIC PROCEDURES

           NEXTEL must cooperate immediately with CROWN when called upon to
           investigate a source of interference, whether or not it can be
           conclusively proven that NEXTEL's equipment is involved.

     XIII. TOWER

           This section deals with items which are to be mounted on, attached to
           or affixed to the tower.

     A.    ICE SHIELDS

           At CROWN's sole discretion, protective ice shields may be required
           and manufacturer of ice shield will be determined by CROWN.

     B.    CLIMBING BOLTS AND LADDERS

           All attachments made to the tower shall be made in such a manner as
           not to cause any safety hazard to other users or cause any
           restriction of movement on, or to any climbing ladders, leg step
           bolts or safety cables provided.

     C.    BRIDGE

     1     Installation of a cable bridge shall be at CROWN's sole discretion
           and with CROWN's approval.
     2.    If required, and in accordance with the manufacturers recommendations
           for the spacing of supports on horizontal runs for the particular
           type of cable or waveguide, the cable or waveguide shall be secured
           to the brackets on the bridge using clamps and hardware specifically
           manufactured for that purpose.
<PAGE>
 
     3.   No cable or waveguide run shall be clamped, tied or in any way affixed
          to a run belonging to CROWN or any another licensee/lessee.

     D.   CABLE LADDER AND WAVEGUIDE

     1.   NEXTEL shall install a ladder for the vertical routing of cable and
          waveguide. From the horizontal to vertical transition at the point
          where the bridge meets the tower to the point at which the cable or
          waveguide must leave the bridge to route to the antenna, all cable and
          waveguide is to be attached to the ladder in accordance with the
          recommendations of the manufacturer of the cable or waveguide.
     2.   No cable or waveguide run shall be clamped, tied or any way affixed to
          a run belonging to CROWN or any another licensee/lessee.

     E.   DISTRIBUTION RUNS

     1.   Cable or waveguide runs from the cable ladder to the point at which
          they connect to the antenna shall be routed along tower members in a
          manner producing a neat and professional site appearance.
     2.   Cable and/or waveguide runs shall be specifically routed so as not to
          impede the safe use of the tower leg or climbing bolts, or to restrict
          the access of CROWN or any another licensee/lessee.
     3.   Distribution runs shall be clamped to the tower in accordance with the
          recommendations of the manufacturer of the cable or waveguide.
     4.   No cable or waveguide run shall be clamped, tied or in any way affixed
          to a run belonging to CROWN or any another licensee/lessee.

     F.   LENGTHS

     1.   Cable and/or waveguide runs shall not be longer than necessary to
          provide a proper connection and normal maintenance and operation.
     2.   No coiled lengths shall be permitted on the tower, bridge or on the
          ground.

     G.   ENTRY

     1.   Entry of the cable or waveguide to the interior of the shelter shall
          be via ports provided in the shelter wall.
     2.   Cable and/or waveguide entering a port shall be provided with a boot
          to seal the port; the boot shall be a Microflect or equivalent
          commercial product made specifically for the type of cable or
          waveguide and for diameter of the entry port, and approved by CROWN
          before installation. It shall be installed in accordance with the
          instructions of the manufacturer and the port shall be sealed against
          the intrusion of moisture.
<PAGE>
 
XIV.      EQUIPMENT LOCATED WITHIN CROWN'S EQUIPMENT BUILDING

A.        EQUIPMENT INSTALLATION REQUIREMENTS

1.        Any mounting to walls either outside or inside CROWN's building must
          be pre-approved by CROWN.
2.        All racks and equipment are to be plumb and true with the walls and
          floor of the shelter and reflect an installation consistent with the
          electrical and operational requirements of the equipment and
          appearance standards of a professional installation.

3.        Racks are to be bolted to the floor and aligned on the center line as
          in the site drawing provided to CROWN.
4.        Racks are not to be attached to the cable trays.

B.        TRANSMISSION LINES AND/OR WAVEGUIDE ROUTING

1.        Cable trays and/or troughs are required within the shelter for the
          routing of cable and waveguide to the equipment racks and termination
          points.
2.        All cable and waveguide shall be placed and secured to the cable tray.


C.        LENGTHS

1.        Cable and/or waveguide runs in the equipment shelter shall not be
          longer than necessary in order to provide a proper connection.
2.        While adequate slack for purposes of maintenance and operation is
          permitted, no coiled lengths on the tray or elsewhere in the shelter
          are permitted for normal maintenance and operation.

XV.       GROUNDING

1.        NEXTEL must adhere to either the Motorola or AT&T grounding
          specification outlined above based on CROWN's equipment at facility.
2.        All exterior grounding shall be C.A.D. welding.
3.        All antennas shall be bonded to the tower.
4.        Cable and waveguide shall be grounded as a minimum at three specific
          points, and for vertical runs in excess of 200 feet at intermediate
          points.
5.        All cable and waveguide shall be grounded to the tower at the point
          where the run effectively breaks from the tower for its connection to
          the antenna, using clamps and hardware specifically manufactured for
          that purpose.
6.        On the vertical portion of the cable or waveguide run, just above
          where it starts to make its transition from a vertical tower to a
          horizontal bridge run, all cable and waveguide shall be grounded to
          the tower using clamps and hardware specifically manufactured for that
          purpose.
7.        On the exterior of each shelter, at a point near the entry ports, a
          grounding plate must be provided for terminating ground leads brought
          from the cable and waveguide. Each cable and waveguide run shall be
          grounded at this point using clamps and hardware specifically
          manufactured for that purpose.
8.        On cable and waveguide installations where the vertical tower length
          exceeds 200 feet, the run shall be grounded at equally spaced
          intermediate points along the
<PAGE>
 
          length of the run so as not to have a distance between grounding
          points longer than 100 feet.
9.        Cable and waveguide grounding leads shall connect to a separate point
          for each run to the common ground point.
10.       Grounding straps shall be kept to a minimum length and as near as
          possible to vertical down lead and shall be consistent with the
          restraints of protective dress and access.
11.       Grounding plates must be provided for single point access to the site
          grounding system. Each rack shall have a properly sized, insulated
          ground lead from the rack safety and signal grounds to one of the
          grounding points on the ground plate.
12.       The insulated ground lead shall follow the route of and be placed in
          the cable tray.
13.       Each rack shall be separately grounded.
14.       All modifications to grounding system must meet CROWN's impedance
          specification.

XVI.      ELECTRICAL

1.        Power requirements must be approved, in advance by CROWN.
2.        Polarized electrical outlets should be installed for all transmitters
          when possible.
3.        Surge protection is required for all base stations.

XVII.     ELECTRICAL DISTRIBUTION

          All electrical wiring from the distribution breaker panel shall be via
          rigid metal conduit, thin wall, routed along the under side of the
          cable tray to a point directly above the equipment rack. From this
          point, NEXTEL may select how to distribute to its equipment or rack.

XVIII.    TEMPORARY LOADS

          1.   Test equipment, soldering irons or other equipment serving a test
               or repair function may be used only if the total load connected
               to any single dual receptacle does not exceed 15 amps.
          2.   Except as otherwise provided in the Agreement, test equipment to
               be in place for more than seven (7) days will require prior
               approval of CROWN.

XIX.      DOORS

          Equipment building doors shall be kept closed at all times unless when
          actually moving equipment in or out.

XX.       SITE APPEARANCE

          1.   Services to maintain the appearance and integrity of the site
               will be provided by CROWN and will include scheduled cleaning of
               the shelter interiors.
          2.   Each licensee/lessee is expected and required to remove from the
               site all trash, dirt and other materials brought into the
               shelter, or onto the site during their installation and
               maintenance efforts.
          3.   No food or drink is allowed within the equipment shelter.
          4.   No smoking is allowed on the tower site.
<PAGE>
 
XXI.      STORAGE

          No parts or material may be stored on site by NEXTEL.

XXII.     DAMAGE

          NEXTEL shall report to CROWN any damage to any item of the facility,
          structure, component or equipment, whether or not caused by NEXTEL.

XXIII.    REPORTING ON SITE

          Emergency 24 hour contact number(s) must be displayed on outside of
          equipment cabinet/building.
<PAGE>
 
                             SPRINT SPECTRUM, L.P.
                        Penn Center West II, Suite 200
                             Pittsburgh, PA 15276


Mr. Robert Crown, President
Crown Communications
Penn Center West III, Suite 229
Pittsburgh, PA 15276

     Re:  Master Lease Agreement between Sprint Spectrum, L.P. and Crown
          Communications Dated June 11, 1996

Dear Mr. Crown:

     This letter is intended to set forth our agreement with regard to the
modification of the Master Lease Agreement by and between Sprint Spectrum, L.P.
("Lessee") and Crown Communications ("Lessor") dated June 11, 1996 (the "Master
Lease"). The parties hereby agreed to make the following modifications to the
Master Lease:

     1.   A new paragraph shall be added at the end of Article I as follows:

     For a period of two (2) years from the date hereof, Lessor shall
     provide Lessee, on or before each July 1, October 1, January 1,
     and April 1, beginning July 1, 1996, a list of Sites which would
     be incapable of supporting more than the equipment of the Lessee,
     if the Lessee were to request such Site.

     2.   A new paragraph shall be added at the end of Section 7.1 as follows:

     Any material alteration of a Communications Facility by Lessee or any
     activities requiring access to the communications tower itself, will be
     performed by a contractor reasonably acceptable to Lessor (including a
     reasonable insurance requirement) and Lessor's consent thereto shall not be
     unreasonably delayed, conditioned or withheld. In the event Lessee engages
     a contractor to perform a material alteration to the Communications
     Facility, Lessee shall engage Lessor's project manager to inspect, manage
     and approve all activities on the Communications Facility. Lessee shall pay
     Lessor [*] for the construction manager's services. Such [*] fee shall be
     adjusted on each Adjustment Date pursuant to the formula set forth in
     Section 6.2.1. It is further agreed that Crown Network Systems, Inc. is an
     approved contractor to perform any and all alterations on the
     Communications Facility and if Crown Network Systems, Inc. is the
     contractor engaged by Lessee, no project manager will be required.

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
     Except as specifically set forth herein, all other terms and conditions set
forth in the Master Lease shall remain as heretofore.

By signing this Letter Agreement, the parties hereto, with the intent to be
legally bound hereby, shall be entering into a binding agreement pursuant to the
terms and conditions set forth herein.

                                                 Very truly yours,

                                                 SPRINT SPECTRUM, L.P.

                                                 By: /s/ Kurt Bagwell
                                                     -------------------------
                                                     Kurt Bagwell, Assistant
                                                     Vice President, Engineering
                                                     and Operations, East Region

AGREED to and ACCEPTED and
intending to be legally bound hereby this
5th day of July, 1996

CROWN COMMUNICATIONS

By: /s/ Robert A. Crown
    ------------------------
    Robert A. Crown, Owner
<PAGE>
 
                  SECOND AMENDMENT TO MASTER LEASE AGREEMENT
                  ------------------------------------------

     THIS SECOND AMENDMENT TO MASTER LEASE AGREEMENT is entered into as of the
27th day of January, 1997, by and between ROBERT CROWN d/b/a CROWN
COMMUNICATIONS ("Lessor") and SPRINT SPECTRUM L.P. ("Lessee"), a Delaware
limited partnership.

                                   RECITALS:
                                   --------

     A.   Lessor and Lessee entered into a Master Lease Agreement dated as of
June 11, 1996 (the "Master Lease") pursuant to which Lessor agreed to lease to
Lessee certain property for the purpose of locating unmanned radio communication
equipment.

     B.   By letter agreement dated July 5, 1996, the parties amended certain
provisions of the Master Lease (the "First Amendment").

     C.   Lessor and Lessee desire to further amend the terms and provisions of
the Master Lease as hereinafter set forth.

                                  AGREEMENT:
                                  ---------

     NOW, THEREFORE, in consideration of the material premises set forth herein,
the parties hereto, intending to be legally bound, agree as follows:

     1.   All terms defined in the Master Lease and not otherwise defined herein
shall have the meanings ascribed to them in the Master Lease.

     2.   Article 1 of the Master Lease hereby is amended by adding the
following after the third sentence thereof:

     If a Site is to be leased for a term of less than five years (the
     "Temporary Sites"), the parties will enter into an SLA in the form attached
     as Exhibit "A-3". The parties acknowledge that certain Sites may be used
     for transmitting and/or receiving microwave shots.

     3.   Article 1 of the Master Lease hereby is further amended by adding the
following in front of the sixth sentence thereof: "With the exception of SLA's
for Temporary Sites,".

     4.   Article 2, Section 2.1 of the Master Lease hereby is amended by adding
the following after the last sentence: " Notwithstanding anything to the
contrary set forth herein, Lessor is not required to enter into an SLA for any
Temporary Sites."
<PAGE>
 
     5.   Article 3 of the Master Lease hereby is amended by adding in the
second line thereof after the words "unmanned radio communications equipment"
the words "equipment for the transmission and reception of microwave shots." 

     6.   A new paragraph shall be added at the end of Article 4 of the Master
Lease as follows:

     Notwithstanding anything to the contrary set forth herein, the
     Term for Temporary Sites shall be month to month. Either party
     may terminate the SLA for any Temporary Site by providing to the
     other party written notice of such termination at least 60 days
     prior thereto. In the event Lessor provides Lessee notice of
     termination, Lessee shall have the option of converting the
     Temporary Site to a permanent Site by providing notice thereof to
     Lessor within 15 days of Lessor's notice to terminate. In the
     event Lessee so elects to convert a Temporary Site to a permanent
     Site, the Initial Term and the Renewal Terms shall be consistent
     with the SLA Initial Term and the SLA Renewal Term identified
     herein with the understanding that the SLA Initial Term commences
     as of the date of the notice of Lessee's election to convert the
     Temporary Site to a permanent Site.

     7.   Article 6, Section 6.1 of the Master Lease hereby is amended by adding
at the end thereof the following:

     In the event Exhibit "B" does not apply to the type of
     installation at a given Site, the applicable Fee shall be set
     forth in the SLA for that Site. The applicable Fee for Sites used
     for transmitting and/or receiving microwave shots shall be set
     forth in the SLA for such Sites.

     Notwithstanding anything to the contrary set forth herein, in the event
     that the parties enter into an SLA for a Site and (a) such Site requires
     work to be performed by Crown as Lessor or an affiliate of Crown as
     contractor (e.g., Crown Network Systems, Inc.); (b) such Site is not ready
     for operation on or before the Commencement Date; and (c) Lessor permits
     Lessee to place a temporary transmission unit on such Site, then the
     Commencement Date shall be the date the temporary transmission unit, or any
     portion thereof, is first placed on the Site; provided, however, that until
     the Site is completed, the Fee shall be [*] which shall be adjusted on each
     Adjustment Date pursuant to the formula set forth in Section 6.2.1. Lessee
     must immediately remove the temporary transmission unit, without notice and
     at Lessee's expense, upon the completion of the Site.

                                  2

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
     8.   Article 6, Section 6.2.2 of the Master Lease hereby is amended by
adding the following after the second sentence: "Temporary Sites shall not be
counted for the purpose of determining the number of SLA's constituting the
Minimum Number of Sites."

     9.   Except as otherwise expressly provided herein or in the First
Amendment, all terms and provisions of the Master Lease shall remain as
heretofore.

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment Agreement
to be executed and delivered as of the date first above written.


WITNESS                            CROWN COMMUNICATIONS

[SIGNATURE ILLEGIBLE]              By: /s/ Robert A. Crown
- ---------------------                  --------------------- 
                                       Robert A. Crown, Owner 

WITNESS:                           SPRINT SPECTRUM L.P.

[SIGNATURE ILLEGIBLE]              By: /s/ David P. Snyder
- ---------------------                  ---------------------
                                       David P. Snyder, Director of
                                       Operations and Engineering

                                       3
<PAGE>
 
                          EXHIBIT "A-3" TO THE MASTER
 
                          SITE LEASE ACKNOWLEDGEMENT
                          --------------------------

This Site Lease Acknowledgement ("SLA") is made and entered into as of this 
____________ day of _____________ 19___ by and between Robert A. Crown, d/b/a
CROWN COMMUNICATIONS hereinafter designated as "Lessor" and SPRINT SPECTRUM,
L.P., a Delaware Limited Partnership hereinafter designed as "Lessee", pursuant
and subject to that certain Agreement ("Master Agreement") by and between the
Parties hereto, dated as of June 11, 1996. All capitalized terms have the
meanings ascribed to them in the Master Agreement.

1.   The Parcel will consist of that certain parcel of property located in the
     City of _______________________, the County of _______________, and the
     State of ________________________________, more particularly described as a
     __________________ 'by _________________ ' parcel containing approximately 
     ______ square feet situated at ____________________________ (add legal
     description), together with the non-exclusive right for ingress and egress,
     seven (7) days a week, twenty four (24) hours a day, on foot or motor
     vehicle, including trucks, and for the installation and maintenance of
     utility wires, poles, cables, conduits and pipes over, under or along a
     _____' wide right-of-way extending from the nearest public right-of-way,
     ___________________ to the demised premises, said premises and right-of-way
     for access being substantially as described herein in Exhibit "1" to the
     SLA attached hereto and made a part hereof.

2.   Lessee's antenna(s) will consist of _________ antennas, each described in
     terms of type, size, frequency, effective radiated power and height on the
     tower outlined as follows:

     Manufacturer and Type-Number:                   ___________________________
                                                     ___________________________
     Number of Antennas:                             ___________________________
     Weight and Dimension of Antenna(s):             ___________________________
     Transmission Line Mfg. and Type No.:            ___________________________
     Diameter and Length of Transmission Line:       ___________________________
     Height of Antenna(s) on Tower:                  ___________________________
     Direction of Radiation:                         ___________________________
     Equipment Building/Floor Space                                             
        Dimensions:                                  ___________________________
     Frequencies/Max Power Output                    ___________________________

3.   The Fee due and payable by Lessee to Lessor is $____________ per year.

4.   The commencement date of this SLA will be upon commencement of construction
     at the Premises or ninety (90) days from the date hereof, whichever occurs
     first ("Commencement Date"). For purposes of this SLA, any physical
     activity on the Site by Lessee, other than those preliminary activities set
     forth in Article 4 of the Agreement, shall constitute the commencement of
     the construction.

5.   The initial term of this SLA shall be ________ commencing on the
     Commencement Date. The term may be renewed by Lessee for an additional term
     of _________ upon giving written notice to Lessor at least _______ days
     prior to the expiration of the Initial Term or preceding renewal term.

6.   The parties acknowledge that Lessor's rights in the property derive from a
     certain Lease Agreement dated __________ between Lessor herein and
     _________________, hereinafter referred to as the "Prime Lease" and
     attached hereto as Exhibit "2" to the SLA.

IN WITNESS WHEREOF, the Parties hereto have set their hands the day and year
first above written.

__________________________         By______________________
WITNESS                                 Robert A. Crown

                                   SPRINT SPECTRUM, L.P.

__________________________         By______________________
WITNESS                                 David P. Snyder, Director of
                                        Operations and Engineering

<PAGE>
 
                                                                   EXHIBIT 10.17


                            MASTER LEASE AGREEMENT
                            ----------------------


          THIS AGREEMENT, made this 3rd day of October, 1996, between POWERFONE,
INC. D/B/A NEXTEL COMMUNICATIONS, a Delaware Corporation, with its principal
offices located at 31200 Carter Street, Solon, OH 44139, hereinafter designated
"NEXTEL" and ROBERT A. CROWN, d/b/a CROWN COMMUNICATIONS, with its principal
mailing address of Penn Center West III, Building #3, Suite 229, Pittsburgh, PA
15276, hereinafter designated "CROWN".


                              W I T N E S S E T H:

          WHEREAS, CROWN owns or otherwise controls communications facilities
throughout Pittsburgh and the surrounding area;

          WHEREAS, NEXTEL desires to lease space on certain communications
facilities owned or otherwise controlled by CROWN (hereinafter generally
referred to as "Leased Premises"); and

          WHEREAS, CROWN and NEXTEL are desirous of establishing terms and
conditions which will apply to multiple sites located in the counties identified
in Exhibit "A" attached hereto which are to be leased by CROWN to NEXTEL.

          NOW, THEREFORE, in consideration of the mutual covenants contained
herein and intending to be legally bound hereby, the parties hereto agree as
follows:


                                1.  SITE LEASES
                                    -----------

          1.1  SITE LEASE ACKNOWLEDGEMENTS.  This Agreement contains the basic
               ---------------------------                                    
terms and conditions upon which each communications facility is leased by CROWN
to NEXTEL.  That portion of each location wherein CROWN owns or otherwise
controls a communications facility which is leased by NEXTEL pursuant to this
Agreement will be individually referred to as a "Site."   When the parties agree
on the particular terms for the lease of a Site, the parties will execute a Site
Lease Acknowledgement ("SLA") in the form attached hereto as Exhibit  "B" which
describes the specific location, description and size of the Site for each
particular communications facility.  If the communications facility is owned by
Bell Atlantic NYNEX Mobile, Inc. ("BANM"), the parties will enter into an SLA in
the form attached hereto as Exhibit "B-1".   NEXTEL shall indicate its interest
in a particular property by completing and forwarding an executed SLA to CROWN.
The SLA shall become effective and become part of this Agreement upon its
execution by both CROWN and NEXTEL.
<PAGE>
 
          1.2  MINIMUM NUMBER OF SITES.  NEXTEL is interested in leasing from
               -----------------------                                       
CROWN the Sites set forth on Exhibit  "C" attached hereto.  Within 30 days of
the date first written above, NEXTEL shall deliver to CROWN executed SLAs for
each of the Sites set forth on Exhibit "C".  CROWN shall use its best efforts to
provide SLAs for all Sites listed on Exhibit  "C"and CROWN agrees to enter into
SLAs with NEXTEL for at least 60 Sites, whether or not those Sites are listed on
Exhibit "C", within 12 months of the date first written above, time being of the
essence.  The parties agree that NEXTEL shall not be required to enter into an
SLA for a Site set forth on Exhibit  "C" unless CROWN provides to NEXTEL a
signed SLA for said Site within 12 months of the date first written above.
For the purpose of this Agreement, the total number of SLAs actually entered
into by the parties as of the first anniversary of the date first written above
shall be designated as the Minimum Number of Sites.   Regardless of the number
of SLAs actually entered into by the parties, in no event will the Minimum
Number of Sites exceed sixty (60).

          1.3  USE OF ADDITIONAL SITES.  Where a communications tower owned or
               -----------------------                                        
otherwise controlled by CROWN in any of the counties identified in Exhibit "A"
is within a NEXTEL search area and meets NEXTEL's predetermined coverage
requirements, NEXTEL must request an SLA for such additional Sites provided
CROWN is able to make the given Site available within a mutually agreed upon
time period that meets NEXTEL's construction schedules. For purposes of this
Agreement, NEXTEL's predetermined coverage requirement shall include but not be
limited to Site location, height above ground level, antenna configuration and
radiation center. This requirement shall be effective only with respect to Sites
which have been identified to NEXTEL, through written notice by CROWN, prior to
NEXTEL entering into a binding agreement with a third party for the installation
of a communications facility within the applicable search area. If CROWN has so
identified a Site located within the applicable search area, CROWN shall have 30
days from receiving notice of NEXTEL's request for an SLA to notify NEXTEL
whether that Site is available for NEXTEL's purposes. In the event CROWN fails
to respond within said thirty (30) days, the Site will be deemed unavailable and
NEXTEL may proceed with a third party agreement. In connection with any
additional Sites, CROWN shall provide, at no charge to NEXTEL for a period of 30
days, access to the communications facility for the purpose of determining the
suitability of the Site. NEXTEL shall supply, at NEXTEL's expense, all equipment
and materials needed to conduct such tests. CROWN shall supply, at CROWN's
expense, the labor to install 1 antenna and 1 coaxial cable to conduct a
suitability test at each Site. Should NEXTEL fail to lease any additional Site
which is made available by CROWN pursuant to terms described in this provision,
then NEXTEL shall, for each such Site that NEXTEL fails to lease, immediately
commence paying CROWN, as liquidated damages, [*] per month which payments shall
continue until the expiration or termination of this Agreement. The parties
acknowledge that CROWN's damages as a result of NEXTEL's failure to lease any
such Site are difficult of ascertainment and the amount designated as liquidated
damages constitutes a reasonable liquidation thereof and not a penalty. The [*]
annual liquidated damage payment shall be adjusted on each Adjustment Date
according to the formula set forth in Section 4.2.

                                       2

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.


<PAGE>
 
                                     2.  USE
                                         ---

          The Site may be used by NEXTEL only for the installation, operation
and maintenance of unmanned radio communications equipment consistent with the
terms of the SLA.  NEXTEL must, at NEXTEL's sole expense, comply with all laws,
orders, ordinances, regulations and directives of applicable federal, state,
county and municipal authorities or regulatory agencies including, without
limitation, the Federal Communications Commission ("FCC").  NEXTEL must operate
its equipment in a manner that does not interfere with the operations at the
communications facility or any other prior existing users of the communications
facility.  CROWN agrees to cooperate with NEXTEL, at NEXTEL's expense, in
executing such documents or applications required in order for NEXTEL to obtain
such licenses, permits or other governmental approval needed for NEXTEL's
permitted use of the Site.

          Notwithstanding the foregoing, CROWN shall obtain, at CROWN's expense,
any municipal permits necessary for the initial installation of the Site.
NEXTEL will maintain the Site in a reasonable condition and in a manner that
will not interfere with other uses of the communications facility.


                                    3.  TERM
                                        ----

          3.1  TERM OF AGREEMENT.  The initial term of this Agreement shall be
               -----------------                                              
ten (10) years commencing on the date first written above. The term of this
Agreement will be automatically renewed for two (2) additional terms of five (5)
years each unless NEXTEL provides CROWN with notice of intention not to renew
not less than six (6) months prior to the expiration of the then current term.

          3.2  TERM OF SLA.  Each property leased by CROWN to NEXTEL pursuant to
               -----------                                                      
an SLA shall be leased for an initial term of five (5) years with the
commencement date as of the first (1st) day of the month following the
completion of installation of NEXTEL's antennas and coaxial at the Site
("Commencement Date").  The term of each particular SLA shall automatically be
extended for up to three (3) additional five (5) year terms unless NEXTEL
terminates it at the end of the then current term by giving CROWN written notice
of the intent to terminate at least six (6) months prior to the end of the then
current term; provided, however, that the term of all SLAs shall immediately
terminate upon the termination or expiration of this Agreement.  Notwithstanding
the foregoing, if CROWN's rights in the Site are derived from a prime lease or
other agreement with a third party and such prime lease or other agreement has a
shorter term or extension terms than those provided for under this paragraph,
then NEXTEL's right to extend any particular supplement shall only be for as
long as CROWN retains its interest in the same applicable property pursuant to
said prime lease or other agreement.


                                    4.  FEES
                                        ----
                                        
          4.1  RENTAL PAYMENTS.  The annual rental shall be paid in equal
               ---------------                                           
installments beginning on the Commencement Date and continuing on the first day
of each and every month thereafter.  Payments shall be made to CROWN, or such
other person, firm or place as CROWN may, from time to time, designate in
writing at least thirty (30) days in advance of any rental payment date.  

                                       3
<PAGE>
 
The amount of the annual rental shall be that amount designated on the
applicable SLA. The rental amounts for an SLA shall be calculated according to
the schedule set forth in Exhibit "D" attached hereto which amounts shall be
adjusted on each Adjustment Date according to the formula set forth in Section
4.2. In the event that NEXTEL, at any time during this Agreement, is utilizing
less than the Minimum Number of Sites, NEXTEL agrees to pay annual rental to
CROWN for the total number of Sites representing the difference between the
Minimum Number of Sites and the actual number of Sites being leased by NEXTEL.
The annual rental payment for each such Site shall equal the annual rental
payment paid by NEXTEL for the lease of a CROWN Site having up to three (3)
antenna placements at each of those respective Sites, as calculated pursuant to
the schedule set forth in Exhibit "D" plus annual adjustments as identified in
Section 4.2. It is understood that NEXTEL shall make no payments to CROWN for
utilizing less than the Minimum Number of Sites until the passage of ninety (90)
consecutive days during which there are fully executed SLAs for less than the
Minimum Number of Sites. Upon the expiration of said ninety (90) day period,
NEXTEL shall immediately commence making the annual rental payments to CROWN as
described above.

          4.2.  FEE ADJUSTMENT.   The annual rental and other fees identified in
                --------------                                                  
this Agreement shall be adjusted (collectively "Adjusted Fee") on the first
anniversary on the date of this Agreement and every annual anniversary
thereafter ("Adjustment Date") by the following formula:

[*]

                                       4

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.
<PAGE>
 

[*]

          4.3  ADDITIONAL RENT.  NEXTEL shall pay as additional rent any
               ---------------                                          
increase in taxes or other assessment, including but not limited to real estate
taxes, levied against the Leased Premises which are attributable to the
improvements, or portions thereof, that are constructed or installed by or on
behalf of NEXTEL.  CROWN will provide reasonable documentation of real estate
taxes attributable to the improvements, or portions thereof, that are
constructed or installed by or behalf of NEXTEL.


          4.4  SITE DEVELOPMENT FEE.  Following the full execution of an SLA,
               --------------------                                          
CROWN shall send with the SLA its invoice to NEXTEL requesting payment of a Site
Development Fee in the amount of [*] for the services provided by CROWN as
described in Exhibit "E" attached hereto. Payment of the Site Development Fee
shall be made by NEXTEL within thirty (30) days from receipt of CROWN's invoice.
The [*] Site Development Fee shall be adjusted on each Adjustment Date pursuant
to the formula set forth in Section 4.2.

          4.5  INTEREST.  Any fee not paid within ten (10) business days of when
               --------                                                         
due may, at CROWN's option, bear interest until paid at the lesser of:

               4.5.1  The rate of 10 percent per annum; or

               4.5.2 The maximum rate allowed under the laws of the Commonwealth
                     of Pennsylvania.

          4.6  OTHER AMOUNTS.  Any sums due to CROWN under this Agreement which
               -------------                                                   
are not specifically defined as "Fees" are deemed additional fees and are
subject to the interest charges, late fees and adjustments as specified herein
and in the other provisions of this Agreement which address fees.


                          5.  ADDITIONAL CONSIDERATION
                              ------------------------

          As additional consideration for this Agreement, NEXTEL agrees to
provide CROWN service credits for NEXTEL's digital wireless communications
system of up to [*] per month.  Said service credits are exclusive of any
long distance or roaming charges.  Said service credits shall also be exclusive
of any salesman service credits that may be provided to CROWN 

                                       5

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.
<PAGE>
 
or to CROWN Mobile Systems, Inc. by NEXTEL. The [*] monthly service
credits shall be adjusted, based on an annual service credit rate of [*],
on each Adjustment Date pursuant to the formula set forth in Section 4.2. The
service credits set forth herein are not cumulative. The unused portion of the
monthly service credit, if any, will not be carried over the subsequent months.
The service credits described above are for CROWN or CROWN's affiliates business
use only. CROWN is not permitted to resell the service credits.


                                   6.  ACCESS
                                       ------

          NEXTEL shall have free access during the term of an SLA to the Site
twenty-four (24) hours per day, seven (7) days per week.  NEXTEL acknowledges
that the foregoing access rights are subject to any limitations evidencing the
underlying real estate interests to the communications facility.  In the event
NEXTEL, its agents or contractors perform any work at a Site, CROWN will be
guaranteed by NEXTEL that CROWN will not experience any down time in operation
or any other operations at the communications facility and NEXTEL will indemnify
and reimburse CROWN for any and all claims of liability or losses by any third
party resulting from any such down time in operation and any actual damages or
losses sustained by CROWN resulting from any such down time in operation
directly attributable to NEXTEL's work at a Site.  CROWN shall furnish NEXTEL
with necessary devices for the purpose of ingress and egress to the said Site
and communications facility.  It is agreed, however, that only authorized
engineers, employees or properly authorized contractors of NEXTEL or persons
under their direct supervision will be permitted to enter said Site.  NEXTEL
will retain ownership of all buildings, equipment and appurtenances NEXTEL
installs at any Site; provided, however, that the removal of said equipment will
not structurally affect the integrity of any structures.


                       7.  IMPROVEMENTS AND CONSTRUCTION
                           -----------------------------

          7.1  APPROVED COMMUNICATIONS FACILITY.  NEXTEL has the right, at
               --------------------------------                           
NEXTEL's sole cost and expense, to erect, maintain, replace and operate at the
Site, only that communications facility specified on the SLA.   It is understood
that NEXTEL shall have the right at each and every Site, subject to compliance
with the terms of this Agreement and particularly those set forth in this
Section, to replace the equipment described in an SLA with similar and
comparable equipment so long as: (a) there is no greater wind loading,
structural loading, size, weight or height; and (b) the equipment operates at
the frequency or range of frequencies designated in the applicable SLA, or at
the frequency or range of frequencies identified in NEXTEL's current licenses or
successor licenses thereto, for the transmission of wireless communications
signals of that given Site.  It is understood that any such replacement
equipment must be frequency compatible with then existing uses of the Site and
that any change in frequency shall not adversely impact the business of CROWN,
as determined within CROWN's sole discretion. Prior to commencing any
installation or material alteration of a communications facility and prior to
accessing the communications tower structure for any reason whatsoever, NEXTEL
must obtain 

                                       6



[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.


<PAGE>
 
CROWN's approval of:


               7.1.1  NEXTEL's plans for installation or alteration work; and

               7.1.2  The identity of the contractor performing the installation
                      or material alteration or in any way accessing the tower
                      structure itself.

CROWN's approval must not be unreasonably withheld or delayed.  All of NEXTEL's
installation and alteration work must be performed:

               7.1.3  At NEXTEL's sole cost and expense;

               7.1.4  In a good and workmanlike manner, using the care and skill
                      ordinarily used by members of the profession practicing
                      under similar conditions at the same time and in the same
                      geographic area;

               7.1.5  In accordance with applicable building codes and the
                      provisions of Exhibit "F" attached hereto; and

               7.1.6  Must not adversely affect the structural integrity or
                      maintenance of the Site or any structure on or use of the
                      Leased Premises.

          Any structural alterations to a structure on the Leased Premises must
be designed, at NEXTEL's sole cost and expense, by a structural engineer
licensed in the jurisdiction where the Site is located. Notwithstanding the
foregoing, for any structural alterations on a tower, such structural engineer
must either be approved by the tower manufacturer or by CROWN.  For structural
alterations requiring a municipal permit, the structural engineer must be
satisfactory to the local municipality.

          Following the initial installation of a Site, any installation,
maintenance, material alteration or removal of equipment at a Site by NEXTEL and
any activities whatsoever requiring access to a tower structure, must be
performed by a contractor reasonably acceptable to Lessor (which acceptance may
specifically include a requirement that all such contractors provide to CROWN,
in advance of any such Work) certificates of insurance consistent with the
provisions of this Agreement).  CROWN's consent thereto shall not be
unreasonably withheld or delayed.  In the event that the Independent Contractor
Agreement between the parties has expired or terminated and CROWN, therefore,
does not perform such work, NEXTEL must engage CROWN's project manager to
monitor, inspect and approve all activities performed by or on behalf of NEXTEL
at the initial rate of [*] per hour not to exceed a total of [*] per
Site for any given installation, maintenance or material alteration project.
The hourly rate and the maximum charge for the project manager shall be adjusted
on each Adjustment Date pursuant to the formula set forth in Section 4.2.
Notwithstanding anything to the contrary contained in this Agreement, 

                                       7

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.
<PAGE>
 
CROWN, with respect to any work to be performed at a Site, shall have the right
of first refusal to meet any bona fide bid selected by NEXTEL for the
performance of such work upon the same terms and conditions as set forth in the
bid. CROWN shall have seven (7) business days after the receipt of such bid to
notify NEXTEL whether CROWN intends to meet such bid and perform the work in
accordance with the bid. In the event CROWN does not notify NEXTEL within such
time, NEXTEL may proceed to contract with said bidder subject to CROWN's
approval as set forth above.

          Said erection, maintenance, replacement and operation will in no way
damage or interfere with CROWN's use of or any other operations at the
communications facility.  If damage or interference is caused by NEXTEL and
NEXTEL fails to make such repairs immediately after notice by CROWN, CROWN may
make the repairs and the reasonable costs thereof shall be payable to CROWN by
NEXTEL on demand.  If NEXTEL does not make payment to CROWN within thirty (30)
days after such demand, CROWN shall have the right to immediately terminate the
applicable SLA. .  No materials may be used in the installation of the antennas
or transmission lines that will cause corrosion or rust or deterioration of the
tower structure or its appurtenances.

          7.2  LIENS.   NEXTEL must keep the Site free from any liens arising
               -----                                                         
from any work performed, materials furnished or obligations incurred by or at
the request of NEXTEL.   If any lien is filed against the Site as a result of
the acts or omissions of NEXTEL's employees, agents or contractors, NEXTEL must
discharge the lien or bond the lien off in a manner reasonably satisfactory to
CROWN within thirty (30) days after NEXTEL receives written notice from any
party that the lien has been filed.  If NEXTEL fails to discharge or bond any
lien within such period, then, in addition to any other right or remedy of
CROWN, CROWN may, at CROWN's election, discharge the lien by either paying the
amount claimed to be due or obtaining the discharge by deposit with a court or a
title company or by bonding.  NEXTEL must pay on demand any amount paid by CROWN
for the discharge or satisfaction of any lien, and all reasonable attorneys'
fees and other legal expenses of CROWN incurred in defending any such action or
in obtaining the discharge of such lien, together with all necessary
disbursements in connection therewith.

          7.3  WAIVER OF CROWN'S LIEN.
               ---------------------- 


               7.3.1  CROWN waives any lien rights it may have concerning NEXTEL
                      improvements which are deemed NEXTEL's personal property
                      and not fixtures and NEXTEL has the right to remove the
                      same at any time without CROWN's consent.

               7.3.2  CROWN acknowledges that NEXTEL has or may enter into a
                      financing arrangement including promissory notes and a
                      financial and security agreement ("Financing Agreement")
                      for the financing of the NEXTEL improvements at the Sites
                      (the "Collateral") with a third party or parties (the
                      "Financing Entity"). In connection therewith, CROWN (i)
                      consents to the installation of the Collateral; (ii)
                      disclaims any interest in the 

                                       8
<PAGE>
 
                      Collateral, as fixtures or otherwise; and (iii) agrees
                      that the Collateral shall be exempt from execution,
                      foreclosure, sale, levy, attachment, or distress for any
                      Rent due or to become due and that such Collateral may be
                      removed at any time without recourse to legal proceedings.
                      NEXTEL agrees to notify CROWN in writing that NEXTEL has
                      entered into the Financing Agreement and of the identity
                      of the Financing Entity. Any removal of property made
                      pursuant to this Section 7.3 shall be made consistent with
                      the provisions of this Agreement.

          7.4  POSSESSION.  Taking possession of the Site by NEXTEL is
               ----------                                             
conclusive evidence that NEXTEL:

               7.4.1  Accepts the Site as suitable for the purposes for which
                      they are leased;

               7.4.2  Accepts the Site and any structure on the Site and every
                      part and appurtenance thereof AS IS, with all faults; and

               7.4.3  Waives any claims against CROWN in respect of defects in
                      the Site or the Leased Premises and its appurtenances,
                      their habitability or suitability for any permitted
                      purposes, except:

                      7.4.3.1  If otherwise expressly provided hereunder;

                      7.4.3.2  If resulting from the negligence or willful
                               misconduct of CROWN, CROWN's employees, agents or
                               contractors;

                      7.4.3.3  If resulting from any known claim by a third
                               party not identified by CROWN in CROWN's
                               representations under this Agreement; or

                      7.4.3.4  If CROWN had actual or constructive knowledge or
                               should have known of defects and did not disclose
                               those defects to NEXTEL.

          For the purposes of this provision, NEXTEL is deemed to take
possession upon the Commencement Date of the respective SLA.  Conducting tests
and inspections on the Site is not the commencement of construction.


                                8.  INTERFERENCE
                                    ------------

                                       9
<PAGE>
 
          NEXTEL agrees to have installed transmitting and receiving equipment
of the type and frequency which will not cause measurable interference as
defined by the FCC to CROWN and/or, other users of the premises.  In the event
NEXTEL's equipment causes such interference, NEXTEL will take all steps
necessary to correct and eliminate the interference within forty-eight (48)
hours of the transmittal by CROWN via facsimile, or other notice defined in this
Agreement, to NEXTEL's Director of Network Engineering.  CROWN agrees that any
future tenants of the Leased Premises who take possession after the date of
execution of any SLA will have installed transmitting and receiving equipment of
the type and frequency which will not cause measurable interference to NEXTEL as
defined by the FCC. In addition, CROWN agrees that any existing tenants at any
Sites will continue to use their existing equipment in such a manner as to not
cause measurable interference to NEXTEL and not allow any existing user to add
new equipment that would cause measurable interference to NEXTEL.  In the event
any equipment of any future tenant, and any current tenant to the extent the
current tenant's equipment is malfunctioning or is different or being operated
differently from when NEXTEL installed its equipment, of the communications
facility causes interference, CROWN will see that said tenant takes all steps
necessary to correct and eliminate the interference within forty-eight (48)
hours of the transmittal by NEXTEL via facsimile, or other notice defined in
this Agreement, to CROWN  and that said tenant ceases operation until said
interference is eliminated.



                              9.  INDEMNIFICATION
                                  ---------------

          NEXTEL shall indemnify and hold CROWN and all subsidiary companies and
affiliates harmless against any claim of liability or loss from bodily injury
and/or property damage resulting from or arising out NEXTEL's and/or any of its
subcontractors', servants', agents' or invitees' use or occupancy of the Site,
including but not limited to any claim of liability or loss associated with any
Environmental Hazards as defined in this Agreement, excepting, however, such
claims or damages as may be due to or caused by the negligence or willful
misconduct of CROWN, or its subcontractors, servants, agents or invitees.  If
CROWN is made a party to any litigation commenced by or against NEXTEL for any
of the above reasons, then NEXTEL shall protect and hold CROWN harmless and pay
all costs, penalties, charges, damages, expenses and reasonable attorneys' fees
incurred or paid by CROWN in connection therewith.

          CROWN shall indemnify and hold NEXTEL and all subsidiary companies and
affiliates harmless against any claim of liability or loss from bodily injury
and/or property damage resulting from or arising out CROWN's and/or any of its
subcontractors', servants', agents' or invitees' use or occupancy of the Site,
including but not limited to any claim of liability or loss associated with any
Environmental Hazards as defined in this Agreement, excepting, however, such
claims or damages as may be due to or caused by the negligence or willful
misconduct of NEXTEL, or its subcontractors, servants, agents or invitees.  If
NEXTEL is made a party to any litigation commenced by or against CROWN for any
of the above reasons, then CROWN shall protect and hold NEXTEL harmless and pay
all costs, penalties, charges, damages, expenses and reasonable attorneys' fees
incurred or paid by NEXTEL in connection therewith.

                                       10
<PAGE>
 
                                 10.  INSURANCE
                                      ---------

          NEXTEL shall maintain at its expense throughout the term of this
Agreement, general liability insurance with a combined single limit of Ten
Million ($10,000,000.00) Dollars for bodily injury and property damage.
Coverage shall include Independent Contractors Liability.  At execution of this
Agreement, NEXTEL shall provide a Certificate of Insurance to CROWN, evidencing
CROWN as an additional insured and which shall contain a provision for thirty
(30) day notice of cancellation or material change to CROWN.  NEXTEL shall also
maintain Auto Liability insurance in an amount no less than One Million
($1,000,000.00) Dollars combined single limit for bodily injury and/or property
damage. NEXTEL must also maintain statutory Workers' Compensation Insurance and
Employee's Liability for the statutory limit but in no event less than One
Million ($1,000,000.00) Dollars.

          All insurers will be rated AX(10) or better and must be licensed to do
business in the jurisdiction where the respective Sites are located.   The
provision of insurance required in this Agreement shall not be construed to
limit or otherwise affect the liability of NEXTEL.

          NEXTEL will not do or permit to be done in or about the Leased
Premises nor bring or keep or permit to be brought to the Leased Premises
anything that:  (a)  is prohibited by any insurance policy carried by CROWN
covering the Site, any improvements thereon, or the Leased Premises; or (b) will
increase the existing premiums for any such policy beyond that contemplated for
the addition of NEXTEL's communications facility.  CROWN acknowledges and agrees
that the installation of NEXTEL's communications facility upon the Leased
Premises in accordance with the terms and conditions of this Agreement will be
considered within the underwriting requirements of any of CROWN's insurers and
such premiums contemplate the addition of the communications facility.

          The parties hereby waive any and all rights of action for negligence
against the other which may hereafter arise on account of damages to the
premises or Site resulting from any fire, or other casualty of the kind covered
by standard fire insurance policies, regardless of whether or not, or in what
amounts, such insurance is now or hereafter carried by the parties, or either of
them.  NEXTEL and CROWN shall each obtain a Waiver of Subrogation from their
respective insurance  companies in which said insurance companies also waive
their respective rights to recover.


                           11. SURRENDER OF PREMISES
                               ---------------------

          NEXTEL, upon termination of the Agreement or the applicable SLA, shall
have removed its equipment, personal property and all fixtures and have restored
the Site to its original condition, reasonable wear and tear excepted.  If such
time for removal causes NEXTEL to remain on the Site after termination of this
Agreement or the applicable SLA, NEXTEL shall pay rent at one and one-half times
the then existing annual rate until such time as the removal of the 

                                       11
<PAGE>
 
equipment, personal property and all fixtures are completed. Nothing in this
provision shall be construed as providing NEXTEL the right to hold over and
CROWN, immediately upon the termination or expiration of the Agreement or the
applicable SLA, shall have the right to evict NEXTEL from the Leased Premises.

                                       12
<PAGE>
 
                         12.  COVENANTS AND WARRANTIES
                              ------------------------

          12.1  CROWN.  CROWN warrants, with respect to each particular SLA
                -----                                                      
that:

               12.1.1  CROWN, or the entity for which CROWN possesses the
                       management rights, owns good, marketable fee simple
                       title, has a good and marketable leasehold interest, has
                       the right as a manager or has a valid license or easement
                       in the land on which the Site is located and has the
                       right of access thereto.

               12.1.2  CROWN will not permit or suffer the installation and
                       existence of any other improvement upon the structure or
                       land of which the Site is a portion if such improvement
                       materially interferes with transmission or reception by
                       NEXTEL's communications facility;

               12.1.3  The Leased Premises, to the best knowledge of CROWN, is
                       not contaminated by any Environmental Hazards as defined
                       below;

               12.1.4  Telephone service and electrical service are available to
                       NEXTEL at each and every Site with the understanding that
                       NEXTEL will pay for utility services needed to operate
                       its communications facility; and

               12.1.5  CROWN will keep, at CROWN's expense, the communications
                       tower structure in good repair as required by law and
                       applicable state and local codes and regulations and
                       shall also comply with all rules and regulations enforced
                       by the FCC and FAA with regard to the lighting, marking
                       and painting of towers and CROWN will keep, at CROWN's
                       expense, the equipment building structure in good repair.


          12.2  NEXTEL.  NEXTEL warrants, with respect to each particular SLA
                ------                                                       
that:

               12.2.1  NEXTEL will maintain the antennas, transmission lines and
                       other appurtenances in proper operating condition and
                       maintain same as to appearance and safety; and

               12.2.2  All installations and operations by NEXTEL in connection
                       with this Agreement shall meet with all applicable rules
                       and regulations of the FCC and all applicable codes and
                       regulations of the municipality, county and state
                       concerned. CROWN specifically assumes no responsibility
                       for the licensing, operation and/or maintenance of
                       NEXTEL's radio equipment.

          12.3  MUTUAL.  Each party represents and warrants to the other party:
                ------                                                         

                                       13
<PAGE>
 
               12.3.1  It has full right, power and authority to make this
                       Agreement and to enter into the SLAs;

               12.3.2  The making of this Agreement and the performance thereof
                       will not violate any laws, ordinances, restrictive
                       covenants, or other agreements under which such party is
                       bound;

               12.3.3  That such party is qualified to do business in any states
                       in which the Sites are located; and

               12.3.4  All persons signing on behalf of such party were
                       authorized to do so by appropriate corporate or
                       partnership action.


          12.5  NO BROKERS.   CROWN and NEXTEL represent to each other that
                ----------                                                 
neither has had any dealings with any real estate brokers or agents in
connection with this Agreement.


                         13.  CASUALTY OR CONDEMNATION
                              ------------------------


          13.1  CASUALTY.  If there is a casualty to any structure upon which a
                --------                                                       
NEXTEL communications facility is located, CROWN must within  ninety (90) days
repair or restore the structure.  During said period of repair or restoration,
all rent and other fees identified in this Agreement applicable to that Site
shall be abated.  Upon completion of such repair or restoration, NEXTEL is
entitled to reinstall NEXTEL's communications facility.  In the event such
repairs or restoration will reasonably require more than  ninety (90) days to
complete, NEXTEL is entitled to terminate the applicable SLA upon thirty (30)
days prior written notice.

          13.2  CONDEMNATION.  If there is a condemnation of the Site, including
                ------------                                                    
without limitation a transfer of the Site by consensual deed in lieu of
condemnation, then the SLA for the condemned Site will terminate upon transfer
of title to the condemning authority, without further liability to either party
under this Agreement.  NEXTEL is entitled to pursue a separate condemnation
award for NEXTEL's communications facility from the condemning authority.


                                  14.  DEFAULT
                                       -------

          14.1  NEXTEL'S DEFAULT.  The occurrence of any one or more of the
                ----------------                                           
following events constitutes an "event of default" by NEXTEL under this
Agreement:

               14.1.2  If NEXTEL fails with respect to a total of five (5) or
                       more Sites to pay any fee or other sums payable by NEXTEL
                       within twenty (20) business days of NEXTEL's receipt of
                       written request for payment:

                                       14
<PAGE>
 
               14.1.3  Breach of any representation, warranty or covenant set
                       forth in this Agreement including any SLA, with the
                       exception of the non-payment of any fee or other sums by
                       NEXTEL, which is not cured within thirty (30) days of
                       receipt of written notice, except such thirty (30) day
                       cure period will be extended as reasonably necessary to
                       permit NEXTEL to complete the cure so long as NEXTEL
                       commences the cure within such thirty (30) day period and
                       thereafter continuously and diligently pursues and
                       completes such cure;

               14.1.4  If any petition is filed by or against NEXTEL, under any
                       section or chapter of the present or any future federal
                       Bankruptcy Code or under any similar law or statute of
                       the United States or any state thereof (and with respect
                       to any petition filed against NEXTEL, such petition is
                       not dismissed within ninety (90) days after the filing
                       thereof), or NEXTEL is adjudged bankrupt or insolvent in
                       proceedings filed under any section or chapter of the
                       present or any future Bankruptcy Code or under any
                       similar law or statute of the United States or any state
                       thereof;

               14.1.5  If a receiver, custodian or trustee is appointed for
                       NEXTEL or for any of the assets of NEXTEL and such
                       appointment is not vacated within sixty (60) days of the
                       date of appointment;

               14.1.6  If NEXTEL becomes insolvent or makes a transfer in fraud
                       of creditors; or

               14.1.7  If NEXTEL's equipment is found to be interfering as
                       described in this Agreement and said interference is not
                       timely corrected as provided herein.


          14.2  CROWN'S REMEDIES. If an event of default occurs, CROWN (without
                ----------------                                               
notice or demand except as expressly required above) may terminate this
Agreement including applicable SLAs, in which event NEXTEL will immediately
surrender the Sites to CROWN.  NEXTEL will become liable for damages equal to
the total of:

               14.2.1  The actual costs of recovering the Sites;

               14.2.2. The fee earned as of the date of termination, plus
                       interest thereon from the date due until paid;

               14.2.3. The amount by which any fees and other benefits that
                       CROWN would have received under the applicable SLAs for
                       the remainder of the term under the applicable SLA after
                       the time of award subject to CROWN's duty to mitigate
                       damages as set forth below;

               14.2.4. All other sums of money and damages owing by NEXTEL to

                                       15
<PAGE>
 
                       CROWN.

          CROWN may elect any one or more of the foregoing remedies with respect
to this Agreement or to any particular SLA.

          14.3  CROWN'S DEFAULT.  If CROWN is in breach of any representation,
                ---------------                                               
warranty or covenant set forth in this Agreement and such breach is not cured
within thirty (30) days of receipt of written notice thereof, except such thirty
(30) day cure period will be extended as reasonably necessary to permit CROWN to
complete the cure so long as CROWN commences the cure within such thirty (30)
day period and thereafter continuously and diligently pursues and completes such
cure, NEXTEL may, in addition to any other remedy available at law or in equity,
at NEXTEL's option upon written notice:

               14.3.1  Terminate the applicable SLA; or

               14.3.2  Incur any expense reasonably necessary to perform the
                       obligation of CROWN specified in such notice and invoice
                       CROWN for the actual expenses, together with interest as
                       set forth herein from the date named. Any invoice shall
                       be accompanied by documentation reasonably detailing
                       actual expenses. If CROWN fails to reimburse the costs
                       within thirty (30) days of receipt of written notice,
                       then NEXTEL is entitled to offset and deduct such
                       expenses from the fees or other charges next becoming due
                       under any SLA.

          NEXTEL may elect any one or more of the foregoing remedies with
respect to any particular SLA.


          14.4.  DUTY TO MITIGATE DAMAGES.   CROWN and NEXTEL shall endeavor in
                 ------------------------                                      
good faith to mitigate damages arising under this Agreement.


                           15.  ENVIRONMENTAL MATTERS
                                ---------------------

          CROWN represents and warrants that to the best of CROWN's knowledge
there are no Environmental Hazards on any Site.  Nothing in this Agreement or in
any SLA will be construed or interpreted to require that NEXTEL remediate any
Environmental Hazards located at any Site unless NEXTEL or NEXTEL's officers,
employee, agents or contractors placed the Environmental Hazards on the Site.

          NEXTEL will not bring to, transport across or dispose of any
Environmental Hazards on any particular Leased Premises or Site without CROWN's
prior written approval, which approval 

                                       16
<PAGE>
 
shall not unduly be withheld or delayed. NEXTEL's use of any approved substances
constituting Environmental Hazards must comply with all applicable laws,
ordinances and regulations governing such use.

          The term "Environmental Hazards" means hazardous substances, hazardous
wastes, pollutants, asbestos, polychlorinated biphenyl (PCB), petroleum or other
fuels (including crude oil or any fraction or derivative thereof) and
underground storage tanks.  The term "hazardous substances" shall be defined in
the Comprehensive Environmental Response, Compensation, and Liability Act, and
any regulations promulgated pursuant thereto.  The term "pollutants" shall be as
defined in the Clean Water Act, and any regulations promulgated pursuant
thereto.  This Section shall survive termination of the Agreement and any
particular SLA.

                        16.  COVENANT OF QUIET ENJOYMENT
                             ---------------------------

          CROWN covenants that NEXTEL, on paying the rent and performing all the
terms, covenants and conditions of this Agreement, shall peaceably and quietly
have, hold and enjoy the Leased Premises.


                             17.  ENTIRE AGREEMENT
                                  ----------------

          It is agreed and understood that this Agreement, including all SLAs,
contain all the agreements, promises and understandings between CROWN and NEXTEL
and that no verbal or oral agreements, promises or understandings shall be
binding upon either CROWN or NEXTEL in any dispute, controversy or proceeding at
law, and any addition, variation or modification to this Agreement shall be void
and ineffective unless made in writing signed by the parties.


                              18.  GOVERNING LAW
                                 -------------

          The laws of the Commonwealth of Pennsylvania, disregarding conflict of
law principles, shall govern this Agreement. Further, each party submits to the
jurisdiction of any federal or commonwealth court sitting in Allegheny County,
Pennsylvania.


                                19.  ASSIGNMENT
                                     ----------

          This Agreement may not be sold, subleased, assigned or transferred by
NEXTEL without prior approval or consent of CROWN; provided, however, that
NEXTEL may assign its interest to its parent company, any subsidiary or
affiliate or to any successor-in-interest or entity acquiring 51% or more of its
stock or assets, subject to Motorola's and/or NTFC's interest, if any, in this
Agreement and so long as any such purchaser, sublessee, assignee or transferee
has 

                                       17
<PAGE>
 
a net worth of at least $25,000,000.00 as defined by generally accepted
accounting principles. It is understood that any such assignment shall not
relieve NEXTEL of any liability for performance of this Agreement. NEXTEL
acknowledges that POWERFONE, INC. d/b/a NEXTEL COMMUNICATIONS is the current
holder of all FCC licenses for the counties identified in Exhibit "A" . As to
other entities, this Agreement may not be sold, subleased, assigned or
transferred, in whole or in part, without the written consent of CROWN, for any
purpose, which consent may be withheld in CROWN'S absolute discretion.


          CROWN consents to the assignment by NEXTEL of this Agreement to the
Financing Entity described in Paragraph 7.3 above as security for the payment of
all indebtedness and performance of obligations under the Financing Agreement;
provided that, such assignment shall not constitute assumption by the Financing
Entity of any obligations under this Agreement unless and until the Financing
Entity elects to assume NEXTEL's rights and obligations herein in the event
NEXTEL defaults under the Financing Agreement or any agreement with the
Financing Entity related thereto.  In such event, the Financing Entity may, but
shall have no obligation to take in its name or in the name of NEXTEL or
otherwise, such actions as the Financing Entity may, at any time or from time to
time deem necessary to utilize the Premises.  NEXTEL hereby irrevocably
authorizes CROWN to accept such performance by the Financing Entity.  Any such
assignment does not relieve NEXTEL of any liabilities or obligations for
performance identified in this Agreement.


                                20. SEVERABILITY
                                    ------------

          If any provision of this Agreement or any SLA is invalid or
unenforceable with respect to any party, the remainder of this Agreement, or the
application of such provision to persons other than those as to whom it is held
invalid or unenforceable, is not to be affected and each provision of this
Agreement is valid and enforceable to the fullest extent permitted by law.


                                 21. NO WAIVER
                                     ---------

          No provision of this Agreement will be deemed to have been waived by
either party unless the waiver is in writing and signed by the arty against whom
enforcement is attempted.  The rights granted in this Agreement are cumulative
of every other right or remedy that the enforcing party may otherwise have at
law or in equity or by statute and the exercise of one or more rights or
remedies will not prejudice or impair the concurrent or subsequent exercise of
other rights or remedies.


                               22. REPRESENTATION
                                   --------------

                                       18
<PAGE>
 
          The parties acknowledge and agree that they have been represented by
counsel and that each of the parties has participated in the drafting of this
Agreement.  Accordingly, it is the intention and agreement of the parties that
the language, terms and conditions of this Agreement are not be construed in any
way against or in favor of any party hereto by reason of the responsibilities in
connection with the preparation of this Agreement.


                                  23.  NOTICES
                                       -------

          Any notice or demand required to be given in this Agreement shall be
made by certified  mail, return receipt requested, or reliable overnight
courier, to the address of the other party set forth below:


  As to NEXTEL:  NEXTEL Communications
                 31200 Carter Street
                 Solon, OH  44139
                 Attention:  _________________________


WITH A COPY TO:  NEXTEL Communications, Inc.
                 1505 Farm Credit Drive
                 McLean, VA  22102
                 Attention:  Contracts Manager


   As to CROWN:  Robert A. Crown
                 Crown Communications
                 Penn Center West III
                 Suite 229
                 Pittsburgh, PA  15276

          Any such notice or demand is deemed received  three (3) business days
following deposit in the United States Mails addressed as required above.  CROWN
or NEXTEL may from time to time designate any other address for this purpose by
giving written notice to the other party.


                              24.  BINDING EFFECT
                                   --------------

          This Agreement shall extend to and bind the heirs, personal
representatives, successors 

                                       19
<PAGE>
 
and assigns of the parties hereto. The parties further agree that all of the
provisions in this Agreement shall affect and bind any and all tenants or
occupants of the Site who come upon the same through or by agreement with either
party. Each party shall be fully responsible to ensure that any and all tenants
or occupants of the Site who come upon the same through or by agreement with
that party comply with all of the terms and provisions of this Agreement and
such party shall be fully liable and responsible for any breaches of this
Agreement by its tenants or occupants.


                           25.  PRIME LEASE AGREEMENT
                                ---------------------

          The Parties acknowledge that CROWN's rights in the Site may be derived
from a separate agreement with a third party hereinafter referred to generally
as a "Prime Lease Agreement" in which CROWN or BANM is lessee, grantee or
licensee therein.  If this is the case, a copy of said Prime Lease Agreement
shall be attached as Exhibit "2" to the SLA, and the following provisions shall
be applicable.  In the event approval of the prime lessor, grantor or licensor
is required in the Prime Lease Agreement, the effectiveness of any SLA
concerning such property shall be specifically subject to the obtaining of such
approval.  Further, all the terms, conditions and covenants contained in this
Agreement shall be specifically subject to and subordinate to the terms and
conditions of any Prime Lease Agreement affecting the Site which is the subject
of the particular SLA. In the event any of the provisions of the Prime Lease
Agreement supersede or contradict the terms of this Agreement, such terms of
this Agreement shall be deemed deleted or superseded to the extent of the
contradiction as applicable to the space utilized by NEXTEL.  Further, NEXTEL
agrees to be bound by and agrees to perform all the acts and responsibilities
required of the lessee, grantee or licensee pursuant to the Prime Lease
Agreement as are applicable to the access and occupancy of the premises utilized
by NEXTEL.  Lastly, in the event the Prime Lease Agreement terminates for any
reason, the SLA relating to the Site covered by said Prime Lease Agreement,
shall be deemed to have terminated effective the date of the termination of the
Prime Lease Agreement.  In the event a Prime Lease Agreement is terminated as
the result of CROWN's breach thereof, CROWN shall refund to NEXTEL a portion of
the Site Development Fee and a portion of the Fixed Fee for Site Development as
set forth in Exhibit "B to the Independent Contractor Agreement ("Fixed Fee")
paid by NEXTEL calculated as follows:  The Site Development Fee and the Fixed
Fee multiplied by a fraction wherein the denominator is 120 and the numerator is
120 minus the number of months that NEXTEL utilized the Site.


                                26.  TERMINATION
                                     -----------

          In the event any previously approved zoning or governmental permit
affecting the use of the property as a communications facility is withdrawn or
terminated, the SLA relating to the property covered by said permit or approval
shall be deemed to have been terminated effective the date of the termination of
the permit or approval.  In addition to any other rights to terminate 

                                       20
<PAGE>
 
an SLA, CROWN has the right to terminate an SLA and all of NEXTEL's right to the
premises leased pursuant to the SLA if any equipment placed on the Site by
NEXTEL unreasonably interferes with any equipment located on said Leased
Premises and NEXTEL fails to resolve such interference problem as provided
above.

                                 27. SUPERSEDES
                                     ----------

          This Agreement revokes and supersedes any other oral or written
agreements between the parties, whether or not in writing, that pertain to the
subject matter described herein.


                              28.  NON-DISCLOSURE
                                   --------------

          The parties agree that without the express written consent of the
other party, neither party shall reveal, disclose or promulgate to any third
party the terms of this Agreement or any portion thereof, except to such third
party's auditor, accountant or attorney or to a governmental agency if required
by regulation, subpoena or government order to do so.


                               29.  THIRD PARTIES
                                    -------------

          Any obligations imposed on NEXTEL in this Agreement shall be equally
and fully applicable to any other third parties that NEXTEL brings on to the
property or comes upon the property through or under the authority of NEXTEL.
Any breach by such other third parties shall be deemed a breach by NEXTEL under
this Agreement and NEXTEL shall be fully liable and responsible to CROWN
pursuant to the terms of this Agreement for such breach.

          IN WITNESS WHEREOF, the parties hereto have set their hands and
affixed their respective seals the day and year first above written.
 

ATTEST:                           POWERFONE, INC.
                                  d/b/a NEXTEL COMMUNICATIONS


 [Illegible signature]            By:  /s/ Lou Peltzer
- --------------------------------      -----------------------------------
                                      Title:  President
                                             -----------------

                                       21
<PAGE>
 
WITNESS:                          ROBERT A. CROWN
                                  d/b/a CROWN COMMUNICATIONS


 /s/ Michael Vennum               By:  /s/ Robert A. Crown
- --------------------------------      ----------------------------------
                                      Owner

                                       22
<PAGE>
 
                   EXHIBIT "A" to the Master Lease Agreement
                                        
                            COUNTIES ENCOMPASSED BY
                            -----------------------
                         MASTER TOWER LEASE AGREEMENT
                         ----------------------------


     PENNSYLVANIA                             WEST VIRGINIA
     ------------                             -------------

      Allegheny                                 Calhoun
      Armstrong                                 Doddridge
      Beaver                                    Gilmer
      Blair                                     Jackson
      Boone                                     Kanawha
      Butler                                    Lewis
      Cambria                                   Mason
      Cameron                                   Putnam
      Clearfield                                Ritchie
      Crawford                                  Roane
      Elk                                       Tyler
      Fayette                                   Wetzel
      Greenbriar
      Greene
      Huntingdon
      Indiana
      Jefferson
      Lawrence
      Lincoln
      Logan
      McDowell
      McKean
      Mercer
      Mifflin
      Mingo
      Monroe
      Raleigh
      Somerset
      Summers
      Venango
      Washington
      Westmoreland
      Wyoming
<PAGE>
 
                   EXHIBIT "B" to the Master Lease Agreement
                                    (1 of 2)

                           SITE LEASE ACKNOWLEDGEMENT


     This Master Tower Lease Site Lease Acknowledgement ("SLA") is made and
entered into as of this ____________ day of _______________________, 199___, by
and between POWERFONE, INC. d/b/a NEXTEL COMMUNICATIONS, hereinafter designated
as "NEXTEL" and Robert A. Crown, d/b/a CROWN COMMUNICATIONS, hereinafter
designated as "CROWN", pursuant and subject to that certain Master Tower Lease
Agreement (the "Agreement") by and between the Parties hereto, dated as of
_____________________, 1996.   All capitalized terms have the meanings ascribed
to them in the Agreement.


     1.   The Site shall consist of a portion of that certain parcel of
property, located in the City of ______________________, the County of
_________________________________, and the State of ______________, more
particularly described as a ________' by ________' parcel containing
approximately _____________ square feet situated at
___________________________________________________________________ (add legal
description), together with the non-exclusive right for ingress and egress,
seven (7) days a week twenty-four (24) hours a day, on foot or motor vehicle,
including trucks, and for the installation and maintenance of utility wires,
poles, cables, conduits, and pipes over, under, or along a _________ ( ____')
feet wide right-of-way extending from the nearest public right-of-
way,___________________ to the demised premises, said premises and right-of-way
for access being substantially as described herein in Exhibit "1" to the SLA
attached hereto and made a part hereof.

     2.   NEXTEL shall have the right to install its antennas and equipment
consistent with the specifications and in the locations described below:

     Manufacturer and type-number:                              _______
                                                                _______
                                                                _______   

     Number of antennas:                                        _______
     Weight and dimension of antenna(s) (LxWxD):                _______
     Transmission line mfr. & type no.:                         _______
     Diameter & length of transmission line:                    _______'
     Location of antennas (as described in Exhibit "2"
     attached hereto and made a part hereof):                   _______
     Height of antenna(s) on structure:                         _______'
     Direction of radiation:                                    _______
     Equipment building/floor space dimensions (as described
     in Exhibit "3" attached hereto and made a part hereof):    _______
     Frequencies/Max Power Output                               _______


     3.   The first (1st) annual rental payment due and payable by NEXTEL to
CROWN is $_____________ per year, payable in equal monthly installments in
accordance with the Agreement.  Any future rent adjustments shall be calculated
in accordance with the Agreement.
<PAGE>
 
                   EXHIBIT "B" to the Master Lease Agreement
                                    (2 of 2)


     4.   The parties acknowledge that CROWN's rights in the property derive
from a certain agreement dated _____________ between CROWN herein and
____________________________, hereinafter referred to as the "Prime Lease" and
attached hereto as Exhibit "2" to the SLA.  In the event CROWN receives any
written notice of failure to pay or failure to perform any covenant, agreement
or obligation, CROWN shall notify NEXTEL of such notice as soon as the notice is
received by CROWN pursuant to the terms of the Prime Lease and NEXTEL may take
any such actions to cure any such failure if CROWN fails to cure the same within
the time allotted in the notice.  NEXTEL shall be under no obligation to take
such action but may do so solely at its own discretion.  In the event NEXTEL
pays any amount or performs any obligations on behalf of CROWN pursuant to the
terms of the Prime Lease, NEXTEL may deduct such amounts paid or the reasonable
value of the performance from the amount that would otherwise be due from NEXTEL
to CROWN pursuant to this Agreement.

     5.   In the event a Prime Lease Agreement is terminated as the result of
CROWN's breach thereof, CROWN shall refund to NEXTEL a portion of the Site
Development Fee and a portion of the Fixed Fee for Site Development as set forth
in Exhibit "B to the Independent Contractor Agreement ("Fixed Fee") paid by
NEXTEL calculated as follows:  The Site Development Fee and the Fixed Fee
multiplied by a fraction wherein the denominator is 120 and the numerator is 120
minus the number of months that NEXTEL utilized the Site.

     IN WITNESS WHEREOF, the parties hereto have set their hands and affixed
their  respective seals the day and year first above written.

 
ATTEST:                           POWERFONE, INC.
                                  d/b/a NEXTEL COMMUNICATIONS


________________________________  By:  ___________________________________
 
                                  Title:   _________________


                                  ROBERT A. CROWN
                                  d/b/a CROWN COMMUNICATIONS


______________________            By:   ___________________________________
WITNESS                                 Robert A. Crown
                                        Owner

                                      25
<PAGE>
 
                                      26
<PAGE>
 
                  EXHIBIT "B-1" to the Master Lease Agreement
                                    (1 of 2)


                        BANM SITE LEASE ACKNOWLEDGEMENT


     This Master Tower Lease Site Lease Acknowledgement ("SLA") is made and
entered into as of this ___________ day of _______________________, 199___, by
and between POWERFONE, INC. d/b/a NEXTEL COMMUNICATIONS, hereinafter designated
as "NEXTEL" and Robert A. Crown, d/b/a CROWN COMMUNICATIONS, hereinafter
designated as "CROWN", pursuant and subject to that certain Master Tower Lease
Agreement (the "Agreement") by and between the Parties hereto, dated as
of___________________, 1996.   All capitalized terms have the meanings ascribed
to them in the Agreement.


     1.   The Site shall consist of a portion of that certain parcel of
property, located in the City of ______________________, the County of
_________________________________, and the State of ______________, more
particularly described as a ________' by ________' parcel containing
approximately _____________ square feet situated at
___________________________________________________________________ (add legal
description), together with the non-exclusive right for ingress and egress,
seven (7) days a week twenty-four (24) hours a day, on foot or motor vehicle,
including trucks, and for the installation and maintenance of utility wires,
poles, cables, conduits, and pipes over, under, or along a _________ ( ____')
feet wide right-of-way extending from the nearest public right-of-
way,___________________ to the demised premises, said premises and right-of-way
for access being substantially as described herein in Exhibit "1" to the SLA
attached hereto and made a part hereof.

     2.   NEXTEL shall have the right to install its antennas and equipment
consistent with the specifications and in the locations described below:


     Manufacturer and type-number:                              _______
                                                                _______
                                                                _______   

     Number of antennas:                                        _______
     Weight and dimension of antenna(s) (LxWxD):                _______
     Transmission line mfr. & type no.:                         _______
     Diameter & length of transmission line:                    _______'
     Location of antennas (as described in Exhibit "2"
     attached hereto and made a part hereof):                   _______
     Height of antenna(s) on structure:                         _______'
     Direction of radiation:                                    _______
     Equipment building/floor space dimensions (as described
     in Exhibit "3" attached hereto and made a part hereof):    _______
     Frequencies/Max Power Output                               _______



     3.   The first (1st) annual rental payment due and payable by NEXTEL to
CROWN is $_____________ per year, payable in equal monthly installments in
accordance with the Agreement.  
<PAGE>
 
Any future rent adjustments shall be calculated in accordance with the
Agreement.

                  EXHIBIT "B-1" to the Master Lease Agreement
                                    (2 of 2)

     4.   The parties acknowledge that Lessor's rights in the property derive
from a certain Master Lease Agreement dated December 29, 1995 between Lessor and
Bell Atlantic NYNEX Mobile, Inc. ("BANM Master Lease Agreement"), a copy of the
relevant portions of which has been delivered to Lessee.  For the purpose of
this SLA, the Lessee agrees to abide by the applicable provisions of those
portions of the BANM Master Lease Agreement that have been provided to Lessee
and Lessee acknowledges that the terms and conditions of the BANM Master Lease
Agreement will govern and control to the extent there is any discrepancy or
inconsistency between the terms and conditions of the BANM Master Lease
Agreement and this Master Lease Agreement.  The parties further acknowledge that
BANM's rights to the property derive from a certain lease agreement dated
_______________ between BANM herein and __________________ and attached hereto
as Exhibit "2" to the SLA.  In the event CROWN receives any written notice of
failure to pay or failure to perform any covenant, agreement or obligation,
CROWN shall notify NEXTEL of such notice as soon as the notice is received by
CROWN pursuant to the terms of the Prime Lease and NEXTEL may take any such
actions to cure any such failure if CROWN fails to cure the same within the time
allotted in the notice. NEXTEL shall be under no obligation to take such action
but may do so solely at its own discretion.  In the event NEXTEL pays any amount
or performs any obligations on behalf of CROWN pursuant to the terms of the
Prime Lease, NEXTEL may deduct such amounts paid or the reasonable value of the
performance from the amount that would otherwise be due from NEXTEL to CROWN
pursuant to this Agreement.

     5.   In the event a Prime Lease Agreement is terminated as the result of
CROWN's breach thereof, CROWN shall refund to NEXTEL a portion of the Site
Development Fee and a portion of the Fixed Fee for Site Development as set forth
in Exhibit "B to the Independent Contractor Agreement ("Fixed Fee") paid by
NEXTEL calculated as follows:  The Site Development Fee and the Fixed Fee
multiplied by a fraction wherein the denominator is 120 and the numerator is 120
minus the number of months that NEXTEL utilized the Site.

     IN WITNESS WHEREOF, the parties hereto have set their hands and affixed
their respective seals the day and year first above
written.

 
ATTEST:                           POWERFONE, INC.
                                  d/b/a NEXTEL COMMUNICATIONS

________________________________  By:  ___________________________________
 
                                  Title:   _________________

                                  ROBERT A. CROWN
                                  d/b/a CROWN COMMUNICATIONS

______________________        BY:   _______________________________


                                      28
<PAGE>
 
WITNESS                             Robert A. Crown
                                    Owner


                                      29
<PAGE>
 
                             EXHIBIT "1" to the SLA

                                SITE DESCRIPTION
<PAGE>
 
                             EXHIBIT "2" to the SLA

                             PRIME LEASE AGREEMENT
                   EXHIBIT  "C"to the Master Lease Agreement
                                    (1 of 2)

 
Site Number and Name          Height            Height
- ---------------------------  ---------  -----------------------
                             Requested         Available
                             ---------  -----------------------
MB05         McMurray             200'                    150'
MB08         Cooperstown          195'                    225'
MB09         West Winfield        250'                    250'
MB13         Perryopolis          200'                    200'
MB14         Waltersburg          250'                    230'
MB36         Sheradon             117'                     90'  (1)
MB39         Penn Hills           117'                     90'  (1)
MB41         Hopewell             117'                     90'  (1)
MB42         Imperial             117'                    180' on new 
                                                               250' tower
MB43         Murrysville          117'                    120'
MB44         Wall                 167'                     90'  (1)
MB47         Jefferson            250'                    100'
MB48         Delmont              250'                          (2)
MB50         Rostraver            230'                    170'
MB52         Gibsonia             177'                          (3)
MB57         Eastvale             ***                           (3)
MB59         Whitehall            150'                    120'
MB60         Etna                 152'                    120'  (1)
MB62         Charleroi            200'                    200'
MB66         West Newton          200'                    200'
MB67         Indianola            155'                          (3)
Echo 1       Crane                300'                    295'
Echo 2       Bluebell             300'                    275'
Echo 3       Monroeville          350'                    350'
Echo 4       Cranberry            300'                    305'
Echo 5       Clark Building       Top Rooftop             285'or 340'
Echo 8       Kittanning           300'  
Echo 11 A    Airport               84'                     70'
Echo 12      Washington           300'                    350'
Echo 14      Butler               250'                    250'
Echo 15      Greensburg           300'                    300'
Echo 16      Zelienople           300'                    300'
Echo 17      Beaver               300'                    300'
Echo 18      Canonsburg           250'                    150'
<PAGE>
 
Echo 23      Glassport            250'                    250'
Echo 26      Oakland              200'                          (3)
Echo 29      Connellsville        300'                    300'
Echo 30      Carnegie             300'                    300'
Echo 32      Freeport             250'                          (3)
Echo 38      North Braddock       250'                    250'
Echo 39      Star Lake            200'                    200'
Echo 40      North Park           300'                    300'
Echo 43      Level Green          250'                    250'
Echo 45      Calvary              300'                    300'
Echo 46      Latrobe              250'                    250'
<PAGE>
 
                   EXHIBIT "C" to the Master Lease Agreement
                                    (2 of 2)

<TABLE> 
<CAPTION> 
Site Number and Name                 Height           Height
- --------------------                 ------           ------        
                                   Requested        Available
                                   ---------        ---------
<S>          <C>                   <C>              <C>
Echo 47      Bethel Park             300'                    (3)
Echo 53      Uniontown II            250'              250'
Echo 54      Coraopolis              300'                    (3)
Echo 57      Moraine                 300'              300'
Echo 62      Youngwood               200'              200'
Echo 65      North Huntingdon        300'                    (3)
Echo 89      North Fayette           250'                    (3)
Echo 90      Town North Towers       300'  Building top 85'
Echo 91      Glenfield               300'                    (3)
Echo 94      Upper St. Clair         300'              300'
Echo 99      Bavington               200'              200'
Echo 101     Aliquippa               200'              200'
Echo ME01    Bentleyville            200'              200'
</TABLE> 

(1)  These Heights are currently available; however, we are engaged in zoning
     proceedings to raise these tower heights to 180'.  If we are able to raise
     these tower heights, NEXTEL would be able to locate at the 150' level.

(2)  This tower is not available.  CROWN has constructed the following facility
     as a back-up to Echo MB48:

     Echo 61/Delmont
     40/o/  22'  31"
     70/o/  33'  55"
     Ground Elevation             1,515
     Tower Height                   180'
     Available Height               180'

(3)  These are problem sites for which we currently are working on a back-up or
     we are engaged in zoning proceedings to obtain permits.  As soon as we have
     exact coordinates, we will forward them to you.

Searches have also been issued for the following areas:
Echo 112  Mon Valley
Echo 113  Unionville
Echo 114  Hahntown
Echo 115  Church Hill
Echo 116  East Washington
Echo 117  Bradford Woods
Echo 118  Lake Arthur


                                      33
<PAGE>
 
Echo 119  Glass More
Echo 120  Mount Chesnut

                                      34
<PAGE>
 
                   EXHIBIT "D" to the Master Lease Agreement

           Crown                                   Annual Lease Fee
           -----                                   ----------------

     Up to three (3) antenna placements                  [*]
     (omni) at any available height.

     Up to nine (9) antenna placements at any            [*]
     available height.


       BANM Facilities                             Annual Lease Fee
       ---------------                             ----------------

     Up to three (3) antenna placements                  [*] 
     (omni) at any available height.

     Up to nine (9) antenna placements                   [*]
     at any available height.

     The above pricing includes, unless otherwise specified in the SLA, for up
to a 10' x 20' area inside a CROWN equipment building.  In the event CROWN is
unable to provide the entire  allotted 10' x 20' area, NEXTEL shall receive a
rent credit in the amount of [*] for each square foot of building space CROWN
is not able to provide to NEXTEL.


[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
                   EXHIBIT "E" to the Master Lease Agreement


                           SITE DEVELOPMENT SERVICES
                           -------------------------

     -    Identify Site locations with NEXTEL.

     -    Identify and plan space available to NEXTEL in equipment buildings and
          document the layout via CAD drawings.

     -    Verify antenna positions and run intermodulation studies.

     -    Supply NEXTEL with a listing of all materials needed for each
          installation.

     -    Provide a floor plan of the layout for each Site to be approved by
          NEXTEL.
 
 
<PAGE>
 
                   EXHIBIT "F" to the Master Lease Agreement

                              Revision: _________

                                 SITE STANDARDS
                                 --------------

I.   GENERAL

     A.   PURPOSE
          The purpose of these Site Standards is to create a quality site
          installation. These standards are to be in effect for each site at
          which NEXTEL has equipment in, on or at the site and at which NEXTEL
          has a right to occupy pursuant to the lease to which this document is
          an attachment.

     B.   STATE AND NATIONAL STANDARDS

     1.   All installations must conform with all state and national regulations
          and the following state and national codes or any supplements,
          amendments or provisions which supersede them:

          a. American National Standards Institute:
             ANSI/EAI-222E Structural Standards for Steel Antenna Towers and
             Antenna Supporting Structures

          b. Federal Aviation Administration Regulations:
             Vol.  XI, Part 77 Objects Affecting Navigable Airspace
             Advisory Circular Obstruction Marking and Lighting AC 70/7460
             Advisory Circular High Intensity Obstruction Lighting Systems  AC
             150/5345-43,
             FAA/DOD Specifications L-856
          c. Federal Communications Commission Rules and Regulations:
             Code of Federal Construction, Marking and Lighting of Antenna
             Regulations Title 47 Structures Chapter I, Part 17
          d. National Electrical Code
          e. Building Officials and Code Administrators International, Inc.
             Basic National Building Code
             Basic National Mechanical Code
             State Building Code
          f. National Fire Protection Association
             Code 101 - Life Safety
             Code 90A - Air Conditioning and Ventilating Systems
             Code 110 - Emergency and Standby Power Systems
          g. State Fire Safety Code
          h. Occupational Safety and Health Administration
             Safety and Health Standards (29 CFR 1910) General Industry
             Subpart R Special Industries
             1910.268 Telecommunications
             1926.510 Subpart M Fall Prevention
          i. Motorola Grounding Guideline for Cellular Radio Installations,
             Document No. 68P81150E62, 7/23/92 OR AT&T AUTOPLEX/(C)/
             Cellular Telecommunications Systems, Lightning Protection and
             Grounding, 
<PAGE>
 
             Customer Information Bulletin 148B, August 1990, or latest 
             revision.

     C. GENERAL/APPROVAL

     1.   All users shall furnish the following to CROWN prior to installation
          of any equipment:
          a. Completed Application. (NEXTEL must make new Application to CROWN
             for change in Antenna position or type.)
          b. Fully executed supplement.
          c. Copies of FCC Licenses and construction/buildin g permits.
          d. Final site plan outlining property boundaries, improvements,
             easements and access.
          e. Accurate block diagrams showing operating frequencies, all system
             components (active or passive) with gains and losses in dB, along
             with power levels.

     2.   The following will not be permitted at the facility without the prior
          written consent of CROWN.

          a. Any equipment without FCC type acceptance or equipment which does
             not conform to FCC rules and regulations.
          b. Add-on power amplifiers.
          c. "Hybrid" equipment with different manufacturers' RF strips.
          d. Open rack mounted receivers and transmitters.
          e. Equipment with crystal oscillator modules which have not been
             temperature compensated.
          f. Digital/analog hybriding in exciters, unless type-accepted.
          g. Non-continuous duty rated transmitters used in continuous duty
             applications.
          h. Transmitter outputs without a harmonic filter and antenna matching
             circuitry.
          i. Change in operating frequency(ies).
          j. Ferrite devices looking directly at an antenna.
          k. Nickel plated connectors.
          l. Cascaded receiver multicouplers/preamps.

     3.   All emergencies are to be reported immediately to 1-800-852-2671.

     D.   LIABILITY

          It shall be the responsibility of NEXTEL to comply with all of the
          site standards set forth herein. NEXTEL specifically agrees to
          indemnify and hold harmless CROWN against any claim of liability,
          loss, damage or costs including reasonable attorneys' fees, arising
          out of or resulting from NEXTEL's non-compliance with the standards
          set forth herein.


     E.   INSPECTION
<PAGE>
 
          CROWN reserves the right to inspect NEXTEL's area without prior notice
          at any time during the term of the Agreement in order to ensure
          compliance with the standards set forth herein. Any such inspection
          shall be solely for the benefit and use of CROWN and does not
          constitute any approval of or acquiescence to the conditions that
          might be revealed during the course of the inspection.

          CROWN reserves the right to inspect CROWN's area without prior notice.


     F.   DISCLAIMER OF RESPONSIBILITY

          It is the intention of CROWN and NEXTEL that the standards set forth
          herein are part of the Agreement between them. It is specifically
          agreed that they are not intended to be relied upon or to benefit any
          third party. Further, CROWN shall have no liability or responsibility
          to any third party as a result of the establishment of the standards
          set forth herein, any inspection by CROWN of NEXTEL's area in order to
          determine compliance with the standards, the sufficiency or lack of
          sufficiency of the standards, or NEXTEL's compliance or non-compliance
          with the standards and NEXTEL agrees to indemnify and hold harmless
          CROWN against any claim by a third party resulting from such theories.


     G.   NOTICES

          All contacts or notices required or permitted by NEXTEL pursuant to
          these Site Standards shall be provided in writing to CROWN's 
          Director - Operations or his or her designee and any approval or
          consent by CROWN shall only be effective if executed in writing by
          CROWN's Director-Operations or his or her designee.


II.  RADIO FREQUENCY INTERFERENCE PROTECTIVE DEVICES

     A.   If due to NEXTEL's use or proposed use, there exists any change to the
          RF environment it will be at CROWN's sole discretion to require any or
          all of the following:
     1.   IM protection panels can be installed in lieu of separate cavity and
          isolator configurations. CROWN approval required.
     2.   30-76 Mhz
          - Isolators required
          - TX output cavity - minimum of 20 Db rejection @ plus or minus 5 Mhz
     3.   130-174 Mhz
          - Isolators - minimum of 30 Db with bandpass cavity
     4.   406-512 Mhz
          - Isolators - minimum of 60 Db with bandpass cavity
     5.   806-866 Mhz
          - Isolators - minimum of 60 Db with bandpass cavity
     6.   866 Mhz and above - as determined by CROWN.
<PAGE>
 
     B.   Additional protective devices may be required based upon CROWN's
          evaluation of the following information:
     1.   Theoretical Transmitter (TX) mixes.
     2.   Antenna location and type
     3.   Combiner/multicoupler configurations
     4.   Transmitter specifications
     5.   Receiver specifications
     6.   Historical problems
     7.   Transmitter to transmitter isolation
     8.   Transmitter to antenna isolation
     9.   Transmitter to receiver isolation
     10.  Calculated and measured level of Intermodulative (IM) products
     11.  Transmitter output power
     12.  Transmitter Effective Radiated Power (ERP)
     13.  Spectrum analyzer measurements
     14.  Voltage Standing Wave Radio (VSWR) measurements
     15.  Existing cavity selectivity


     C.   NEXTEL will be required to immediately correct excessive cabinet
          leakage which causes interference to other tenants.


III. ANTENNAS AND ANTENNA MOUNTS

     A.   All mounting hardware to be utilized by NEXTEL to be as specified by
          tower manufacturer and approved by CROWN.
     B.   Connections to be taped with stretch vinyl tape (Scotch #33-T or
          equivalent) and Scotchkoted or equivalent (including booted pigtails).
     C.   Must meet manufacturer's VSWR specifications.
     D.   Any corroded elements must be repaired or replaced.
     E.   Must be DC grounded type, or have the appropriate lightning protection
          as determined by CROWN.
     F.   No welding or drilling on mounts will be permitted.
     G.   All antennas must be encased in fiberglass radomes and be painted or
          impregnated with a color designated by CROWN as the standard antenna
          color for aesthetic uniformity.

IV.  CABLE

     A.   All antenna lines to be approved by CROWN.
     B.   All transmission line(s) will be installed and maintained to avoid
          kinking and/or cracking.
     C.   Tagged with weatherproof labels showing manufacturer, model, and
          owner's name at both ends of cable run.
     D.   Any cable fasteners exposed to weather must be stainless steel.
     E.   All interconnecting cables/jumpers must have shielded outer conductor
          and approved by CROWN.
     F.   Internally, all cable must be run in troughs or on cable trays and on
          cable or waveguide bridges at intervals of no less than 3'.
          Externally, all cable must be attached with stainless steel hangers
          and non-corrosive hardware.
     G.   All unused lines must be tagged at both ends showing termination
          points with the 
<PAGE>
 
          appropriate impedance termination at each end.
     H.   All AC line cords must be 3 conductor with grounding plugs.
     I.   All antenna transmission lines shall be grounded at both the antenna
          and equipment ends at the equipment ends and at building entry point,
          with the appropriate grounding kits.
     J.   All cables running to and from the exterior of the cabinet must be
          100% ground shielded. Preferred cables are: Heliax, Superflex or
          braided grounds with foil wrap.


V.   CONNECTORS

     A.   Must be Teflon filled, UHF or N type, including chassis/bulkhead
          connectors.
     B.   Must be properly fabricated (soldered if applicable) if field
          installed.
     C.   Must be taped and Scotchkoted or equivalent at least 4" onto jacket if
          exposed to weather.
     D.   Male pins must be of proper length according to manufacturer's
          specifications.
     E.   Female contacts may not be spread.
     F.   Connectors must be pliers tight as opposed to hand tight.
     G.   Must be silver plated or brass.
     H.   Must be electrically and mechanically equivalent to Original Equipment
          Manufacturers (OEM) connectors.

VI.  RECEIVERS

     A.   No RF preamps permitted in front end unless authorized by CROWN.
     B.   All RF shielding must be in place.
     C.   VHF frequencies and higher must use helical resonator front ends.
     D.   Must meet manufacturer's specifications, particularly with regard to
          bandwidth, discriminator, swing and symmetry, and spurious responses.
     E.   Crystal filters/pre-selectors/cavities must be installed in RX legs
          where appropriate.
     F.   All repeater tone squelch circuitry must use "AND" logic.


VII. TRANSMITTERS

     A.   Must meet original manufacturer's specifications.
     B.   All RF shielding must be in place.
     C.   Must have a visual indicator of transmitter operation.
     D.   Must be tagged with NEXTEL's name, equipment model number, serial
          number, and operating frequency(ies).
     E.   All low-level, pre-driver and driver stages in exciter must be
          shielded.
     F.   All power amplifiers must be shielded.
     G.   Output power may not exceed that specified on NEXTEL's FCC License.


VIII. COMBINERS/MULTICOUPLERS

     A.   Shall at all times meet manufacturer's specifications.
     B.   Must be tuned using manufacturer approval procedures.
     C.   Must provide a minimum of 60 Db transmitter to transmitter isolation.
<PAGE>
 
IX.  CABINETS

     A.   All cabinets must be bonded together and to the equipment building
          ground system.
     B.   All doors must be secured.
     C.   All non-original holes larger than 1" must be covered with copper
          screen or solid metal plates.
     D.   Current license for all operating frequencies should be mounted on the
          cabinet exterior for display at all times.

 
X.   INSTALLATION PROCEDURES

     A.   Any tower work must be scheduled with CROWN using only CROWN approved
          contractors at least 48 hours in advance of site work. NEXTEL will be
          responsible for any and all fees associated with said work.
     B.   Installation may take place only after CROWN has been notified of the
          date and time in writing, and only during normal working hours unless
          otherwise authorized beforehand.
     C.   Equipment may not be operated until final inspection of installation 
          by CROWN, which shall not be unreasonably withheld.
     D.   Any testing periods are to be approved in advance by CROWN and within
          the parameters as defined by CROWN.


XI.  MAINTENANCE/TUNING PROCEDURES

     A.   All external indicator lamps/LED's must be working.
     B.   Equipment parameters must meet manufacturer's specifications.
     C.   All cover, shield, and rack fasteners must be in place and securely
          tightened.
     D.   Local speakers and/or orderwire systems must be turned off except
          during service, testing or other maintenance operations.


XII. INTERFERENCE DIAGNOSTIC PROCEDURES

          NEXTEL must cooperate immediately with CROWN when called upon to
          investigate a source of interference, whether or not it can be
          conclusively proven that NEXTEL's equipment is involved.
<PAGE>
 
XIII. TOWER


     This section deals with items which are to be mounted on, attached to or
     affixed to the tower.

     A.   ICE SHIELDS

          At CROWN's sole discretion, protective ice shields may be required and
          manufacturer of ice shield will be determined by CROWN.

     B.   CLIMBING BOLTS AND LADDERS

          All attachments made to the tower shall be made in such a manner as
          not to cause any safety hazard to other users or cause any restriction
          of movement on, or to any climbing ladders, leg step bolts or safety
          cables provided.

     C.   BRIDGE

          1  Installation of a cable bridge shall be at CROWN's sole
             discretion and with CROWN's approval.

          2. If required, and in accordance with the manufacturers
             recommendations for the spacing of supports on horizontal runs
             for the particular type of cable or waveguide, he cable or
             waveguide shall be secured to the brackets on the bridge using
             clamps and hardware specifically manufactured for that purpose.

     3.   No cable or waveguide run shall be clamped, tied or in any way affixed
          to a run belonging to CROWN or any another licensee/lessee.


     D.   CABLE LADDER AND WAVEGUIDE

          1. NEXTEL shall install a ladder for the vertical routing of
             cable and waveguide.  From the horizontal to vertical 
<PAGE>
 
             transition at the point where the bridge meets the tower to the
             point at which the cable or waveguide must leave the bridge to
             route to the antenna, all cable and waveguide is to be attached to
             the ladder in accordance with the recommendations of the
             manufacturer of the cable 

                                      44
<PAGE>
 
             or waveguide.

          2. No cable or waveguide run shall be clamped, tied or any way
             affixed to a run belonging to CROWN or any another licensee/lessee.

     E.   DISTRIBUTION RUNS

     1.   Cable or waveguide runs from the cable ladder to the point at which
          they connect to the antenna shall be routed along tower members in a
          manner producing a neat and professional site appearance.
     2.   Cable and/or waveguide runs shall be specifically routed so as not to
          impede the safe use of the tower leg or climbing bolts, or to restrict
          the access of CROWN or any another licensee/lessee.
     3.   Distribution runs shall be clamped to the tower in accordance with the
          recommendations of the manufacturer of the cable or waveguide.
     4.   No cable or waveguide run shall be clamped, tied or in any way affixed
          to a run belonging to CROWN or any another licensee/lessee.


     F.   LENGTHS

     1.   Cable and/or waveguide runs shall not be longer than necessary to
          provide a proper connection and normal maintenance and operation.
     2.   No coiled lengths shall be permitted on the tower, bridge or on the
          ground.


     G.   ENTRY

          1. Entry of the cable or waveguide to the interior of the
             shelter shall be via 

                                      45
<PAGE>
 
             ports provided in the shelter wall.

          2. Cable and/or waveguide entering a port shall be provided with a
             boot to seal the port; the boot shall be a Microflect or equivalent
             commercial product made specifically for the type of cable or
             waveguide and for diameter of the entry port, and approved by CROWN
             before installation. It shall be installed in accordance with the
             instructions of the manufacturer and the port shall be sealed
             against the intrusion of moisture.
<PAGE>
 
XIV. EQUIPMENT LOCATED WITHIN CROWN'S EQUIPMENT BUILDING


     A.   EQUIPMENT INSTALLATION REQUIREMENTS

     1.   Any mounting to walls either outside or inside CROWN's building must
          be pre-approved by CROWN.
     2.   All racks and equipment are to be plumb and true with the walls and
          floor of the shelter and reflect an installation consistent with the
          electrical and operational requirements of the equipment and
          appearance standards of a professional installation.

     3.   Racks are to be bolted to the floor and aligned on the center line as
          in the site drawing provided to CROWN.
     4.   Racks are not to be attached to the cable trays.


     B.   TRANSMISSION LINES AND/OR WAVEGUIDE ROUTING

     1.   Cable trays and/or troughs are required within the shelter for the
          routing of cable and waveguide to the equipment racks and termination
          points.
     2.   All cable and waveguide shall be placed and secured to the cable tray.


     C.   LENGTHS

     1.   Cable and/or waveguide runs in the equipment shelter shall not be
          longer than necessary in order to provide a proper connection.
     2.   While adequate slack for purposes of maintenance and operation is
          permitted, no coiled lengths on the tray or elsewhere in the shelter
          are permitted for normal maintenance and operation.


XV.  GROUNDING

     1.   NEXTEL must adhere to either the Motorola or AT&T grounding
          specification outlined above based on CROWN's equipment at facility.
     2.   All exterior grounding shall be C.A.D. welding.
     3.   All antennas shall be bonded to the tower.
     4.   Cable and waveguide shall be grounded as a minimum at three specific
          points, and for vertical runs in excess of 200 feet at intermediate
          points.
     5.   All cable and waveguide shall be grounded to the tower at the point
          where the run effectively breaks from the tower for its connection to
          the antenna, using clamps 

                                      47
<PAGE>
 
          and hardware specifically manufactured for that purpose.
     6.   On the vertical portion of the cable or waveguide run, just above
          where it starts to make its transition from a vertical tower to a
          horizontal bridge run, all cable and waveguide shall be grounded to
          the tower using clamps and hardware specifically manufactured for that
          purpose.
     7.   On the exterior of each shelter, at a point near the entry ports, a
          grounding plate must be provided for terminating ground leads brought
          from the cable and waveguide. Each cable and waveguide run shall be
          grounded at this point using clamps and hardware specifically
          manufactured for that purpose.
     8.   On cable and waveguide installations where the vertical tower length
          exceeds 200 feet, the run shall be grounded at equally spaced
          intermediate points along the length of the run so as not to have a
          distance between grounding points longer than 100 feet.
     9.   Cable and waveguide grounding leads shall connect to a separate point
          for each run to the common ground point.
     10.  Grounding straps shall be kept to a minimum length and as near as
          possible to vertical down lead and shall be consistent with the
          restraints of protective dress and access.
     11.  Grounding plates must be provided for single point access to the site
          grounding system. Each rack shall have a properly sized, insulated
          ground lead from the rack safety and signal grounds to one of the
          grounding points on the ground plate.
     12.  The insulated ground lead shall follow the route of and be placed in
          the cable tray.
     13.  Each rack shall be separately grounded.
     14.  All modifications to grounding system must meet CROWN's impedance
          specification.


XVI. ELECTRICAL

     1.   Power requirements must be approved, in advance by CROWN.
     2.   Polarized electrical outlets should be installed for all
          transmitters when possible.
     3.   Surge protection is required for all base stations.


XVII. ELECTRICAL DISTRIBUTION

     All electrical wiring from the distribution breaker panel shall be via
     rigid metal conduit, thin wall, routed along the under side of the cable
     tray to a point directly above the equipment rack. From this point, NEXTEL
     may select how to distribute to its equipment or rack.


XVIII. TEMPORARY LOADS

     1.   Test equipment, soldering irons or other equipment serving a test or
          repair function may be used only if the total load connected to any
          single dual receptacle does not exceed 15 amps.
     2.   Except as otherwise provided in the Agreement, test equipment to be in
          place for more than seven (7) days will require prior approval of
          CROWN.


XIX. DOORS
<PAGE>
 
     Equipment building doors shall be kept closed at all times unless when
     actually moving equipment in or out.


XX.  SITE APPEARANCE

     1.   Services to maintain the appearance and integrity of the site will be
          provided by CROWN and will include scheduled cleaning of the shelter
          interiors.
     2.   Each licensee/lessee is expected and required to remove from the site
          all trash, dirt and other materials brought into the shelter, or onto
          the site during their installation and maintenance efforts.
     3.   No food or drink is allowed within the equipment shelter.
     4.   No smoking is allowed on the tower site.


XXI. STORAGE

     No parts or material may be stored on site by NEXTEL.


XXII. DAMAGE

     NEXTEL shall report to CROWN any damage to any item of the facility,
     structure, component or equipment, whether or not caused by NEXTEL.


XXIII. REPORTING ON SITE

     Emergency 24 hour contact number(s) must be displayed on outside of
     equipment cabinet/building.


                                      49

<PAGE>
 
                                                                EXHIBIT 10.18

                            MASTER LEASE AGREEMENT

     THIS MASTER LEASE AGREEMENT ("Agreement") is entered into as of the 3rd day
of December, 1996, by and between Robert Crown d/b/a CROWN COMMUNICATIONS a sole
proprietorship ("Lessor") and APT PITTSBURGH LIMITED PARTNERSHIP ("Lessee").


                                    RECITALS

     WHEREAS, Lessor owns, leases, maintains, operates or otherwise controls
communications structures (individually, "Site" and collectively, "Sites") in
the Pittsburgh Metropolitan Trading Area on which are erected wireless
communications facilities; and

     WHEREAS, Lessee wishes to lease from Lessor on a non-exclusive basis space
on such Sites for the purpose of locating unmanned radio communications
equipment thereon.

     NOW THEREFORE, in consideration of the mutual covenants contained in this
Agreement and other good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, the parties, intending to be legally bound,
agree to the following terms and conditions governing the leasing and usage of
the Sites:


                         1.  SITE LEASE ACKNOWLEDGMENTS
                             --------------------------

     When the parties agree on the particular terms for a Site, the parties will
incorporate such terms in a Site Lease Acknowledgment in the form attached as
Exhibit "A" ("SLA"). The SLA shall be completed and executed by the parties. If
such Site is owned, leased, licensed, or otherwise controlled by Bell Atlantic
Nynex Mobile or a related company ("BANM"), the parties will enter into an SLA
in the form attached as Exhibit "A-1". Each executed SLA is deemed to be a part
of this Agreement. The terms and conditions of the SLA will govern and control
if there is a discrepancy or inconsistency between the terms and conditions of
any SLA and this Agreement. Lessee may at its own expense record a memorandum of
the SLA in the form attached as Exhibit "A-2". Upon termination of an SLA for
any reason, Lessee will record a notice of termination of the SLA if Lessee
previously recorded a memorandum of such SLA.
<PAGE>
 
                                 2. SITE LEASES
                                    -----------

     2.1 Lease of Sites. Subject to the terms and conditions contained in this
         --------------                                                       
Agreement and the SLA relating to the Site, Lessor leases and demises to Lessee
and Lessee leases from Lessor that portion of the Site as described on the SLA
("Property"). The real property owned, leased, maintained, operated or otherwise
controlled by Lessor will be described on each SLA. Lessee's equipment and
facilities will be mounted on or in any structure on the Site or on the ground
near the structure all as described in the SLA and in accordance with the terms
of this Agreement. The parties acknowledge that Lessor will not be required to
enter into any SLA unless an Independent Contractor Agreement has been executed
by Crown Network Systems, Inc. and Lessee and is in full force and effect.

     2.2 Minimum Number of Sites. Lessee has agreed to lease not less than
         -----------------------                                          
thirty (30) Sites within twenty-four (24) months after the date of this
Agreement, subject to the availability of space and structural and frequency
compatibility. Within thirty (30) days of the date of this Agreement Lessee
shall deliver to Lessor executed SLAs for each of the Sites described on Exhibit
"D", which Sites meet its design criteria.  Lessor shall use its best efforts to
provide SLAs for the Sites listed on Exhibit "D".  Notwithstanding the
foregoing, the parties agree that Lessee shall not be required to enter into an
SLA for a Site unless Lessor provides a signed SLA to Lessee for each Site
within twelve (12) months of the date hereof.

     2.3 Use of Lessor's Sites. Where a Site meeting the Lessee's design
         ---------------------                                          
criteria for search areas issued by Lessee after the date of this Agreement and
maintained, operated, owned or controlled by Lessor (including certain BANM
towers) is available within the search area determined by Lessee's RF engineers,
Lessee shall use its best efforts to utilize such location as a Site for the
installation of a communications facility.  Lessor and Lessee acknowledge that
Lessee's design criteria includes, but is not limited to, antenna space
requirements, height requirements wind load requirements, coverage requirements,
equipment space requirements and frequency planning.

     Lessor shall provide Lessee, without charge, access to the facility for a
period of thirty (30) days, for purposes of determining its suitability as a
Site.  Lessee shall supply, at its sole expense, all equipment and materials
needed to evaluate 

                                       2
<PAGE>
 
the facility. If Lessee fails to lease a suitable Site meeting Lessee's design
criteria Lessee shall, for each such Site, pay Lessor the sum of $200.00 per
month, from the date of receipt of written notice by Lessor of a breach of this
provision, and monthly thereafter during the Term of this Agreement. These
payments shall constitute liquidated damages. The parties acknowledge that such
sum represents a reasonable determination of damages and not a penalty. The
annual liquidated damage payment or pro rata portion thereof shall be adjusted
on each Adjustment Date according to the formula set forth in Section 6.2.1.


                                     3. USE
                                        ---

     The Property may be used by Lessee only for the installation, operation and
maintenance of unmanned radio communications equipment and related
telecommunications activities consistent with the terms of the SLA.

     Lessee must, at Lessee's sole expense, comply with all laws, orders,
ordinances, regulations and directives of applicable federal, state, county, and
municipal authorities or regulatory agencies, including, without limitation, the
Federal Communications Commission ("FCC").

     Lessee must operate its equipment on Site in a manner that does not
interfere with the operations of the Site as conducted by Lessor or any other
existing users of the Site.

     Lessor agrees to reasonably cooperate with Lessee, at Lessee's expense, in
executing such documents or applications required by Lessee to obtain such
licenses, permits or other governmental approvals needed for Lessee's permitted
use of the Property.


                                    4. TERM
                                       ----

     The term of this Agreement ("Term") is ten (10) years commencing on the
date of execution and delivery of this Agreement by both parties. The term of
this Agreement will be automatically renewed for one (1) term of ten (10) years,
followed by one (1) term of five (5) years (each a "Renewal Term") unless Lessee
provides Lessor with notice of intention not to renew not less than one hundred
eighty (180) days prior to the 

                                       3
<PAGE>
 
expiration of the Agreement Term or the Renewal Term. Subject to the Lessor's
written approval, Lessee may enter the Property before the Commencement Date (as
that term is defined in the SLA), to the extent such entry is related to
engineering surveys, inspections, or other reasonably necessary tests required
prior to construction and installation of a communications facility; said
approval will not be unreasonably withheld, delayed or conditioned. Prior to
entry on the Property Lessee shall obtain liability insurance in form and amount
satisfactory to Lessor with respect to its activities at the Property.

     The Term of each SLA ("SLA Term") will be five (5) years commencing on the
date stated on the SLA, unless otherwise terminated as provided in this
Agreement. The term of each SLA will be automatically renewed for four (4)
additional terms (each an "SLA Renewal Term") of five (5) years each, unless
Lessee provides Lessor with notice of intention not to renew not less than one
hundred eighty (180) days prior to the expiration of the SLA Term or the SLA
Renewal Term; provided, however, that all such SLA's shall immediately terminate
upon the termination or expiration of this Agreement. Under no circumstances,
however, shall any Term extend beyond the period of Lessor's interest in a Site
pursuant to a lease or other agreement with a third party.


                                 5. TERMINATION
                                    -----------
 
     5.1. By Lessor.  Lessor has the right to terminate an SLA and all of
          ----------                                                     
Lessee's right to the Property leased on a Site upon twenty-four (24) hours'
written notice if any equipment placed on the Site by Lessee unreasonably
interferes with any equipment located on the Site on the Commencement Date and
Lessee fails to resolve such interference problem within two (2) business days
of receipt of notice, provided that such interference is not the result of
Lessor's equipment or another lessee's or licensee's equipment operating outside
of its frequency and output specifications.  Lessor may terminate the applicable
SLA upon a default by Lessee which continues beyond any cure period permitted
with respect thereto.

     5.2 By Lessee.  Lessee has the right to terminate an SLA upon sixty (60)
         ---------                                                           
days' prior written notice if:

          5.2.1 Lessee is unable to use the Property for a 

                                       4
<PAGE>
 
communications facility in the manner originally designed by Lessee when
executing the SLA due to an obstruction which is (a) created after the date of
the SLA; (b) within a 3 to 1 slope (3 feet horizontally for every 1 foot of
vertical drop) from the bottom of the lowest antenna leased by Lessee on the
Property; (c) within a quarter mile radius of the communications facility; and
(d) if Lessee reasonably demonstrates that such obstruction results in signal
degradation;
 
          5.2.2 Within 90 days of Site activation or receipt of all requisite
governmental approvals, but in no event more than one hundred eighty (180) days
after executing an SLA, Lessee reasonably determines that it is unable to use
the Property for a communications facility in the manner originally designed by
Lessee when executing the SLA;

          5.2.3 Any certificate, permit, license or approval affecting Lessee's
ability to use the Property in the manner originally intended by Lessee is
rejected; or

          5.2.4 If any previously issued certificate, permit, license or
approval is canceled, expires, lapses, or is otherwise withdrawn or terminated
by the applicable governmental agency.


                                    6. FEES
                                       ----

     6.1 Rental Payments. The annual lease fee ("Fee") for a Property shall be
         ---------------                                                      
payable in equal installments beginning on the Commencement Date and continuing
on the first day of each and every quarter thereafter during the Term or Renewal
Term. The initial payment shall be prorated if the Commencement Date is a date
other than the first day of the quarter. The Fee shall be payable to Lessor at:

     Crown Communications
     Penn Center West III, Suite 229
     Pittsburgh, PA 15276
     Attention: Robert A. Crown

     The Fee will be prorated for any fractional quarter at the expiration or
earlier termination of a particular SLA. The Fee for the Property shall be
determined in accordance with Exhibit "B".

     6.2 Adjustment
         ----------

                                       5
<PAGE>
 
          6.2.1 The Fee for a Property will be adjusted as provided below:

[*]
[*]

Definitions:

[*]
                                       6

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.


<PAGE>
 
[*]

          6.2.2. Fee Increase. If Lessee fails to lease at least thirty (30)
                 ------------
Sites within twenty-four (24) months after the date of this Agreement, then the
fee for each Site leased by Lessee hereunder shall increase by [*] per month
payable together with each successive quarterly Fee payment until Lessee leases
thirty (30) Sites. The foregoing [*] fee increase shall be adjusted on each
Adjustment Date pursuant to the formula set forth in Section 6.2.1.

          6.2.3. Fee Decreases. In the event that Lessor and Lessee enter into
                 -------------
an agreement whereby Lessor becomes the exclusive marketing representative for
the Lessee's communications facility network, which shall consist of all sites
where Lessee has the right to market the platform for the installation of
transmitting or receiving equipment for Lessee's PCS system in the Pittsburgh
Metropolitan Trading Area (as the Pittsburgh Metropolitan Area is constituted as
of the date hereof), then the Fee for each Site leased by Lessee hereunder shall
decrease by [*] per month during such time as the exclusive marketing
representative agreement is in full force and effect. Provided that such
exclusive marketing representative agreement is executed within one year from
the date hereof, such reduction shall take place retroactively, applying to all
Sites leased on or after the date of this Agreement and an appropriate credit
shall be made by the Lessor to Lessee. The foregoing [*] fee reduction shall be
adjusted on each Adjustment Date pursuant to the formula set forth in Section
6.2.1.

     6.3  Interest. Any Fee or other amount payable under this Agreement which
          --------                                                            
is not paid within ten (10) business days of its due date may, at Lessor's
option, bear interest ("Past Due Interest Rate") until paid at the lesser of:

          6.3.1 the rate of ten (10) percent per annum; or

          6.3.2 the maximum rate allowed under the law of the Commonwealth of
Pennsylvania.


     6.4 Late Fee. If Lessee fails to pay any Fee or other amount 
         --------                                                              

                                       7

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
payable under this Agreement within ten (10) business days of the date when due,
Lessor may require that Lessee pay to Lessor a late fee of [*] per Site. The
late fee is in addition to the interest Lessor may assess under Section 6.3 of
this Agreement.

     6.5 Lump Sum Payment Option. As an alternative to the Rental Payments
         -----------------------                                          
described in Section 6.1 of this Agreement, at such time as Lessee has leased
the required number of Sites, Lessee may for any additional Site choose to pay a
one-time lump sum fee equal to the turnkey construction value (based upon the
current market rates) of a 100 foot, 125 foot, 150 foot or 175 foot
tower/monopole (as applicable) (including land costs) by Lessee, payable within
thirty (30) days of the date the Site becomes operational upon completion of
installation of Lessee's antennas and coaxial at the Site.  This payment will
entitle Lessee usage of the Property for up to nine (9) antennas during the Term
and each Renewal Term.  Selection of this option by Lessee shall not affect any
other fees or payments required to be made under this Agreement, which fees or
payments shall be due and payable as set forth herein.  This lump sum payment
shall include the following: all construction costs (civil, engineering,
geotechnical, legal, electrical, general construction and maintenance), all
materials, fencing, tower costs and tower erection costs.  This payment is in
addition to any costs and expenses outlined in the Independent Contractor
Agreement of even date herewith.  In the event Lessee vacates a Site and
subsequently leases the same Site, such subsequent leasing shall not be
construed as a renewal of the original Term, and Lessee shall be obligated to
comply with the provisions of a new agreement to be negotiated by the parties
with respect to the Site.


                        7. IMPROVEMENTS AND CONSTRUCTION
                           -----------------------------

     7.1 Approved Communications Facility. Lessee has the right, at Lessee's
         --------------------------------                                   
sole cost and expense, to erect, maintain, replace and operate at the Property
only that communications facility specified on the SLA. Prior to commencing any
installation or material alteration of a communications facility, Lessee must
obtain Lessor's approval of:

     (i) Lessee's plans for installation or alteration work;

     (ii) the precise location of the communications facility on the Site; and

     (iii) the identity of the contractor performing the work.

     Lessor's approval must not be unreasonably withheld, conditioned or
delayed. Lessee's replacement of equipment with equipment of (a) substantially
the same wind loading, structural 

                                       8

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.
<PAGE>
 
loading, size, weight, height, and (b) operating only at the specific frequency
set forth in the SLA, in the course of repairs or upgrading the communications
facility, is not a material alteration and may be undertaken by Lessee in the
ordinary course so long as such replacement does not violate any provision of
this Agreement.

     All of Lessee's installation and alteration work must be performed at
Lessee's sole cost and expense, in a good and workmanlike manner, and in
accordance with applicable building codes and the provisions of Exhibit "C".

     All work must be performed in a manner which will not adversely affect the
structural integrity, maintenance or marketability of the Site or any structure
on the Site. No materials may be used which will cause erosion or deterioration
of any structure or appurtenance on the Site.

     Any structural alterations to a structure on the Site must be designed by a
licensed structural engineer at Lessee's sole cost and expense. Any structural
engineer undertaking structural alterations on a tower must either be approved
by the tower manufacturer or Lessor and, in the event of structural alterations
requiring a building permit, by the local municipality as well.

     Lessee's right to erect, maintain, replace and conduct operations at the
Property shall be subject to the terms of the Independent Contractor Agreement
between the parties, the terms of which are incorporated herein by reference.

     Such erection, maintenance, replacement and operation shall in no way
damage or interfere with Lessor's operations at or usage of the communications
facility at a Site.  If damage or interference occurs and Lessee fails to make
any necessary repairs or otherwise remedy such damage immediately upon written
notice by Lessor, Lessor may, in addition to any remedy available to it by law
or pursuant to this Agreement, make the repairs or remedy the damage at Lessee's
sole expense, payable upon demand.  Lessee agrees to have installed transmitting
and receiving equipment of the type and frequency which will not cause
measurable interference (as defined by the FCC) to Lessor or to other users of a
Site.

     7.2 Liens. Lessee must keep the Site free from any liens 
         -----              

                                       9
<PAGE>
 
arising from any work performed, materials furnished, or obligations incurred by
or at the request of Lessee.

     If any lien is filed against the Site as a result of the acts or omissions
of Lessee, or Lessee's employees, agents, or contractors, Lessee must discharge
the lien or bond the lien off in a manner reasonably satisfactory to Lessor
within thirty (30) days after Lessee receives written notice from any party that
the lien has been filed.

     If Lessee fails to discharge or bond any lien within such period, then, in
addition to any other right or remedy of Lessor, Lessor may, at Lessor's
election, discharge the lien by either paying the amount claimed to be due or
obtaining the discharge by deposit with a court or a title company or by
bonding.

     Lessee must pay on demand any amount paid by Lessor for the discharge or
satisfaction of any lien, and all reasonable attorneys' fees and other legal
expenses of Lessor incurred in defending any such action or in obtaining the
discharge of such lien, together with all necessary disbursements in connection
therewith.

     7.3 Possession. The taking of possession of the Property by Lessee is
         ----------                                                       
conclusive evidence that Lessee:

             (i)   accepts the Property as suitable for the purposes for which
they are leased;

             (ii)  accepts the Site and any structure on the Site and every part
and appurtenance thereof AS IS; and

             (iii) waives any claims against Lessor for defects in the Site or
Property and its appurtenances, their fitness for a particular purpose or
suitability for any permitted purposes, except:

                   (a) if otherwise expressly provided hereunder;

                   (b) if resulting from the gross negligence or willful
misconduct of Lessor, Lessor's employees, agents or contractors;

                   (c) if resulting from a known claim by a third party not
identified by Lessor in Lessor's representations under 

                                       10
<PAGE>
 
this Agreement; or

                   (d) if known to Lessor and not disclosed to Lessee.

     Lessee is deemed to take possession upon the Commencement Date of the
respective SLA. Conducting tests and inspections on the Property is not the
commencement of construction.


                                  8. UTILITIES
                                     ---------

     Lessee shall not have the right to obtain electrical and telephone service
from any utility company to the Property without Lessor's prior written consent.


                                   9. ACCESS
                                      ------

     The following provisions shall govern access to the Property, unless
otherwise modified on an SLA:

     9.1. Construction. Access for construction, routine maintenance and repair
          ------------                                                         
and other non-emergency visits shall be permitted during normal business hours
(defined as Monday through Saturday, 7 am to 7 pm).

     9.2. Emergency. In the event emergency repairs or maintenance is required
          ---------                                                           
to Lessee's communications facility, Lessee is entitled to access the Property
twenty-four (24) hours per day, seven (7) days per week to perform such
emergency repairs or maintenance, provided that Lessor is immediately notified
in order to coordinate any emergency repairs to the tower or other
communications structure at the earliest possible time.

     9.3. Type of Access. Access to the Property may be by foot or motor
          --------------                                                
vehicle, including trucks and equipment. Lessor shall provide Lessee with
appropriate security devices to provide Lessee with access to the Property.

     Lessee acknowledges that the foregoing access rights are subject to any
limitations or restrictions on access imposed upon Lessor (and therefore upon
Lessee) by the document or documents evidencing Lessor's underlying real estate
interest including any 

                                       11
<PAGE>
 
ground lease or master lease relating to a particular Site, which shall be
provided to Lessee by Lessor together with the SLA. Lessee agrees to indemnify
Lessor for claims of liability by Lessor or a third party, and for any losses or
damages sustained by Lessor as a result of Lessee's activities at the Property,
including but not limited to any curtailment or interruption of its operations
at a Site. Only authorized engineers, employees or contractors of Lessee will be
permitted access. Lessee may retain ownership of all equipment and appurtenances
installed by Lessee at a Site so long as the removal of such personalty will not
affect the structural integrity of any portion of the communications facility.


                         10. IMPROVEMENT FEES AND TAXES
                             --------------------------

     Lessee must pay all taxes and other fees or charges attributable to
Lessee's communications facility or any increases thereto.

     Lessor must pay all taxes and other fees or charges attributable to the
Property (including, without limitation, debt and ground lease obligations),
each Site and, if required under Lessor's ground lease obligations, the real
estate of which the Property is a portion.


                                 11. INSURANCE
                                     ---------

     11.1 Lessee's Requirements. Lessee must, during the term of this Agreement
          ---------------------                                                
and at Lessee's sole expense, obtain and keep in force not less than the
following insurance:

          11.1.1. Property insurance, including coverage for fire, extended
coverage, vandalism and malicious mischief, upon each communications facility in
an amount not less than ninety percent (90%) of the full replacement cost of the
communications facility;

          11.1.2. Commercial General Liability insuring operations hazard,
independent contractor hazard, contractual liability, and products and completed
operations liability, in limits of $10,000,000 combined single limit for each
occurrence for bodily injury, personal injury and property damage liability,
naming Lessor as an additional insured as respects Section 12;

          11.1.3. Statutory Workers' Compensation and Employer's 

                                       12
<PAGE>
 
Liability insurance; and

          11.1.4. Automobile liability insurance in an amount not less than
$1,000,000 combined single limit for bodily injury and/or property damage.
Insurance will include coverage for all automobiles, including hired and non-
owned.

     11.2 Lessor's Requirements. Lessor must, during the term of this Agreement
          ---------------------                                                
and at Lessor's sole expense, obtain and keep in force, the following insurance:

          11.2.1. Property insurance, including coverage for fire, extended
coverage, vandalism and malicious mischief on the Site, in an amount not less
than 90% of the full replacement cost of the Site (excluding, however, the
communications facility); and

          11.2.2. Commercial General Liability insuring operations hazard,
independent contractor hazard, contractual liability and products and completed
operations liability, in limits of $10,000,000 combined single limit for each
occurrence for bodily injury, personal injury and property damage liability,
naming Lessee as an additional insured as respects Section 12.

          11.2.3. Statutory Workers' Compensation and Employer's Liability
insurance in an amount not less than $1,000,000 per occurrence; and

          11.2.4. Automobile liability insurance in an amount not less than
$1,000,000 combined single limit for bodily injury and/or property damage.
Insurance will include coverage for all automobiles, including hired and non-
owned.

     11.3 Policies of Insurance.  All required insurance policies must be taken
          ---------------------                                                
out with reputable national insurers rated AX(10) or better that are licensed to
do business in the jurisdiction where the Property and Sites are located. Each
party agrees that certificates of insurance will be delivered to the other party
as soon as practicable after the placing of the required insurance, but not
later than the Commencement Date of a particular SLA. All policies must contain
an undertaking by the insurers to notify the other party in writing not less
than fifteen (15) days before any reduction in coverage beyond the minimum
coverage required under this Agreement, cancellation, or termination of the
insurance.

                                       13
<PAGE>
 
     Lessor and Lessee will each year review the limits for the insurance
policies required by this Agreement. Policy limits will be adjusted to proper
and reasonable limits as circumstances warrant, but policy limits will not be
reduced below those stated above and no increases will be effective unless
Lessor and Lessee mutually agree.

     11.4 No Limitation on liability.  The provision of insurance required in
          --------------------------                                         
this Agreement shall not be construed to limit or otherwise affect the liability
of any party to the other party.

     11.5 Compliance.  Lessee will not do or permit to be done in or about the
          ----------                                                          
Property, nor bring or keep or permit to be brought to the Property, anything
that:

          (i) is prohibited by any insurance policy carried by Lessor covering
the Site, any improvements thereon, or the Property; or

          (ii) will increase the existing premiums for any such policy beyond
that reasonably contemplated for the addition of the communications facility.

     Lessor acknowledges and agrees that the installation of the communications
facility upon the Property in accordance with the terms and conditions of this
Agreement will be considered within the underwriting requirements of any of
Lessor's insurers and such premiums contemplate the addition of the
communications facility.

     11.6 Release.  Lessor and Lessee release each other, and their respective
          -------                                                             
principals, employees, representatives and agents, from any claims for damage to
any person or to the Property, the Site and any improvements thereon, that are
caused by, or result from, risks insured against under any insurance policies
required to be carried by the parties.  Each party shall cause each insurance
policy to provide that the insurance company waives all right of recovery by way
of subrogation against the other party in connection with any damage covered by
any policy to the extent required by Section 12 Indemnification.


                              12. INDEMNIFICATION
                                  ---------------

     12.1 Indemnification by Lessee.  Lessee must indemnify Lessor and all
          -------------------------                                       
subsidiary companies and affiliates and save it 

                                       14
<PAGE>
 
harmless from and against any and all claims, actions, damages, liability and
expense in connection with the loss of life, personal injury, and/or damage to
property arising from or out of:

          (i) any occurrence in, upon or at the Property or the Site caused by
the acts or omissions of Lessee or Lessee's agents, customers, invitees,
concessionaires, contractors, servants, vendors, materialmen or suppliers,
except to the extent caused by the gross negligence or willful misconduct of
Lessor, Lessor's agents, customers, invitees, concessionaires, contractor,
servants, vendors, materialmen or suppliers;

          (ii) any occurrence caused by the violation of any law, regulation or
ordinance applicable to Lessee's actual use of or presence on the Property or
the actual use of or presence on the Property of Lessee's agents, customers,
invitees, concessionaires, contractors, servants, vendors, materialmen or
suppliers; and

          (iii) real estate brokers claiming by, through or under Lessee for any
commission, fee or payment in connection with this Agreement.

     If Lessor is made a party to any litigation commenced by or against Lessee
for any of the above reasons, then Lessee shall protect and hold Lessor harmless
and pay all reasonable costs, penalties, charges, damages, expenses and
reasonable attorneys' fees incurred or paid by Lessor in accordance with the
provisions of Section 12.3 of this Agreement.

     12.2 Indemnification by Lessor.  Lessor must indemnify Lessee and all
          -------------------------                                       
subsidiary companies and affiliates and save it harmless from and against any
and all claims, actions, damages, liability and expense in connection with the
loss of life, personal injury, and/or damage to property arising from or out of:

          (i) any occurrence in, upon or at the Property or the Site caused by
the acts or omissions of Lessor or Lessor's agents, customers, invitees,
concessionaires, contractors, servants, vendors, materialmen or suppliers,
except to the extent caused by the gross negligence or willful misconduct of
Lessee, Lessee's agents, customers, invitees, concessionaires, contractor,
servants, vendors, materialmen or suppliers;

                                       15
<PAGE>
 
          (ii) any occurrence caused by the violation of any law, regulation or
ordinance applicable to Lessor s actual use of or presence on the Property or
the actual use of or presence on the Property of Lessor's agents, customers,
invitees, concessionaires, contractors, servants, vendors, materialmen or
suppliers; and

          (iii) real estate brokers claiming by, through or under Lessor for any
commission, fee or payment in connection with this Agreement.

     If Lessee is made a party to any litigation commenced by or against Lessor
for any of the above reasons, then Lessor shall protect and hold Lessee harmless
and pay all costs, penalties, charges, damages, expenses and reasonable
attorneys' fees incurred or paid by Lessee in accordance with the provisions of
Section 12.3 of this Agreement.

     12.3 Procedure
          ---------

          12.3.1 Any party being indemnified ("Indemnitee") shall give the party
making the indemnification ("Indemnitor") written notice as soon as reasonably
possible if:

          12.3.1.1. any claim or demand shall be made or liability asserted
against Indemnitee, or

          12.3.1.2. any suit, action, or administrative or legal proceedings
shall be instituted or commenced in which any Indemnitee is involved or is named
as a defendant, either individually or with others.

          12.3.2 If, within thirty (30) days after the giving of such notice,
the Indemnitee receives written notice from Indemnitor stating that the
Indemnitor disputes or intends to defend against such claim, demand, liability,
suit, action or proceeding, then Indemnitor will have the right to select
counsel of its choice and to dispute or defend against such claim, demand,
liability, suit, action or proceeding, at Indemnitor's expense. Indemnitee will
fully cooperate with Indemnitor in such dispute or defense so long as Indemnitor
is conducting such dispute or defense diligently and in good faith; provided,
however, that Indemnitor will not be permitted to settle such dispute or claim
without the prior written approval of Indemnitee, which shall not be
unreasonably withheld, conditioned

                                       16
<PAGE>
 
or delayed. Even though Indemnitor selects counsel of its choice, Indemnitee has
the right to additional representation by counsel of its choice to participate
in such defense at Indemnitee's sole cost and expense.

          12.3.3 If no such notice of intent to dispute or defend is received by
Indemnitee within the thirty (30) day period, or if diligent and good faith
defense is not being, or ceases to be, conducted, Indemnitee has the right to
dispute and defend against the claim, demand or other liability at the sole cost
and expense of Indemnitor and to settle such claim, demand or other liability,
and in either event to be indemnified as provided for in this Section.
Indemnitee is not permitted to settle such dispute or claim without the prior
written approval of Indemnitor, which approval shall not be unreasonably
withheld, conditioned or delayed.

          12.3.4 The Indemnitor's indemnity obligation includes reasonable
attorneys' fees, investigation costs, and all other reasonable costs and
expenses incurred by the Indemnitee from the first notice that any claim or
demand has been made or may be made. The provisions of this Section shall
survive the termination of this Agreement with respect to any damage, injury, or
death occurring before such termination.


                                 13. ASSIGNMENT
                                     ----------

     13.1 By Lessee.  Notwithstanding any provision to the contrary, Lessee may
          ---------                                                            
with Lessor's consent (which consent may not be unreasonably withheld) assign
this Agreement, either in whole or in part, to any subsidiary or affiliate of
Lessee provided Lessee notifies Lessor in writing of its intention to so assign,
or sublet. For purposes of this paragraph, the terms "subsidiary" and
"affiliate" shall be defined as any corporation or entity which controls Lessee,
is controlled by Lessee or is under the common control with Lessee by the same
parent corporation or other entity or successor of Lessee, provided such
successor is in the same business as Lessee and the successor, and any assignor
of this Agreement, so long as they may remain liable for performance of this
Agreement, on a combined basis have a net worth of at least $25,000,000 (as
defined by generally accepted accounting principles consistently applied). The
foregoing net worth requirement shall be adjusted on each Adjustment Date
pursuant to the formula set forth in Section 6.2.1. The assignment of this
Agreement does not constitute a release of the 

                                       17
<PAGE>
 
assignor under this Agreement. Lessee will not assign, sublet, or otherwise
transfer this Agreement, an SLA or any Property to any party other than as set
forth in this Section 13.1 without Lessor's prior written consent, which consent
may be withheld in Lessor's absolute discretion.

     13.2 By Lessor.  Lessor may make any sale, lease, license, assignment or
          ---------                                                          
transfer of any Site, provided such sale, lease, license, assignment or transfer
is subject to the terms and conditions of this Agreement and the applicable SLA.
Lessor may sell, lease, license, assign or transfer this Agreement together with
all SLA's, provided Lessor notifies Lessee in writing of its intention to so
sell, lease, license, assign or transfer and the successor has a net worth of at
least $25,000,000. The foregoing net worth requirement shall be adjusted on each
Adjustment Date pursuant to the formula set forth in Section 6.2.1. The sale,
lease, license, assignment or transfer of this Agreement does not constitute a
release of assignor under this Agreement.


                                  14. REPAIRS
                                      -------

     14.1 Lessee's Obligation. Lessee must, at all times during the term of each
          -------------------                                                   
and every SLA, at Lessee's sole cost and expense, keep and maintain Lessee's
communications facility located by Lessee upon the Property in a structurally
safe and sound condition and in good repair.

     If Lessee does not make such repairs within twenty (20) days after receipt
of notice from Lessor requesting such repairs and such repairs are required,
then Lessor may, at Lessor's option, make the repairs. Lessee shall pay Lessor
on demand Lessor's actual costs in making the repairs, plus Lessor's actual
overhead.  This remedy is in addition to and not in derogation of any other
rights of Lessor under this Agreement or under applicable law.

     If Lessee commences to make repairs within twenty (20) days after any
written notice from Lessor requesting such repairs and thereafter continuously
and diligently pursues and completes such repairs, then the twenty (20) day cure
period will extend for an additional sixty (60) days to permit Lessee to
complete such repairs.

     If emergency repairs are needed to protect persons or property, or to allow
the use of the Property, Lessee must 

                                       18
<PAGE>
 
immediately correct the safety or use problem, even if a full repair cannot be
made at that time, or Lessor may make such repairs at Lessee's expense.

     14.2 Lessor's Obligation. Lessor must, at all times during the term of each
          -------------------                                                   
and every SLA and at Lessor's sole cost and expense, keep and maintain the Site
and any improvements located thereon (excluding Lessee's obligation at Section
14.1 above) in a structurally sound and safe condition.

     If Lessee is unable to use the communications facility because of repairs
required on the Property, Lessee may immediately erect on the Property or an
unused portion of the Site a temporary communications facility, including any
supporting structure, while Lessor makes repairs to the Property.  Lessor shall
provide Lessee with thirty (30) days prior written notice of its intent and
schedule to make any regularly required repairs and maintenance on the Property.


                          15. CASUALTY OR CONDEMNATION
                              ------------------------

     15.1 Casualty. If there is a casualty to any structure upon which a
          --------                                                      
communications facility is located, Lessor must within one hundred twenty (120)
days repair or restore the structure and shall use its best efforts to repair or
restore the structure as quickly as possible.  Lessee may immediately erect on
the Property or an unused portion of the Site a temporary communications
facility, including any supporting structure, while Lessor makes repairs to the
Property and the rental Fee shall be reduced by fifty percent (50%) for such
period that Lessee is unable to use the structure. Upon completion of such
repair or restoration, Lessee is entitled to reinstall Lessee's communications
facility. In the event such repairs or restoration will reasonably require more
than one hundred twenty (120) days to complete, Lessee is entitled to terminate
the applicable SLA upon thirty (30) days prior written notice.

     15.2 Condemnation. If there is a condemnation of the Site, including
          ------------                                                   
without limitation a transfer of the Site by consensual deed in lieu of
condemnation, the SLA for the condemned Site will terminate upon transfer of
title to the condemning authority, without further liability to either party
under this Agreement. Lessee is entitled to pursue a separate condemnation award
for the communications facility from the condemning authority.

                                       19
<PAGE>
 
                    16. SURRENDER OF PREMISES; HOLDING OVER
                        -----------------------------------

     Upon the expiration or other termination of a SLA for any cause whatsoever,
Lessee must peacefully vacate the Property in as good order and condition as the
same was at the beginning of the applicable SLA, except for reasonable use, wear
and tear and casualty and condemnation. Lessee has the absolute right and duty
to remove its communications facility. Lessee will repair any damage caused
during the removal of the communications facility and will return the Property
to its original condition, including the removal of any concrete foundations,
normal wear and tear excepted.

     If Lessee continues to hold any Property after the termination of the
applicable SLA, whether the termination occurs by lapse of time or otherwise,
such holding over will, unless otherwise agreed to by Lessor in writing,
constitute and be construed as a month-to-month tenancy at a monthly Lease Fee
equal to 1/12th of 125% of the Fee for such SLA and subject to all of the other
terms set forth in this Agreement. In such event Lessor shall have the right to
commence ejectment proceedings or any other remedy at law or in equity
notwithstanding this provision.


                            17. DEFAULT AND REMEDIES
                                --------------------

     17.1 Lessee's Events of Default. The occurrence of any one or more of the
          --------------------------                                          
following events constitutes an "event of default" by Lessee under the
applicable SLA:

          17.1.1 If Lessee fails to pay any Fee or other sums payable by Lessee
for the applicable Property within ten (10) business days of Lessee's receipt of
written notice that such Fee or sum payable is late;

          17.1.2 If Lessee fails to perform or observe any other term of the
applicable SLA, including terms and conditions applicable thereto contained in
this Agreement, and such failure continues for more than fifteen (15) days after
written notice from Lessor; except such fifteen (15) day cure period will be
extended as reasonably necessary to permit Lessee to complete a cure so long as
Lessee commences cure within such fifteen (15) day cure period and thereafter
continuously and diligently pursues and completes such cure;

                                       20
<PAGE>
 
          17.1.3 If any petition is filed by or against Lessee, under any
section or chapter of the present or any future federal Bankruptcy Code or under
any similar law or statute of the United States or any state thereof (and with
respect to any petition filed against Lessee, such petition is not dismissed
within ninety (90) days after the filing thereof), or Lessee is adjudged
insolvent in proceedings filed under any section or chapter of the present or
any future federal Bankruptcy Code or under any similar law or statute of the
United States or any state thereof;

          17.1.4 If a receiver, custodian, or trustee is appointed for Lessee or
for any of the assets of Lessee and such appointment is not vacated within sixty
(60) days of the date of the appointment;

          17.1.5 If Lessee becomes insolvent or makes a transfer in fraud of
creditors;

          17.1.6. If Lessee's equipment is found to be interfering as described
in Paragraph 5.1; or

          17.1.7. If Lessee breaches any material representation, warranty or
agreement set forth in this Agreement.

     17.2 Lessor's Remedies. If an event of default occurs, while Lessee remains
          -----------------                                                     
in default, Lessor (without notice or demand except as expressly required above)
may terminate the applicable SLA, in which event Lessee will immediately
surrender the applicable Property to Lessor. Lessee will become liable for
damages equal to the total of:

          17.2.1 the actual costs of recovering the Site;

          17.2.2 the Fee earned as of the date of termination, plus interest
thereon at the Past Due Interest Rate from the date due until paid;

          17.2.3 the amount by which the Fee and other benefits that Lessor
would have received under the applicable SLA for the remainder of the term under
the applicable SLA after the time of award subject to Lessor's duty to mitigate
damages pursuant to Paragraph 17.4; and

          17.2.4 all other sums of money and damages owing by Lessee to Lessor.

                                       21
<PAGE>
 
     Lessor may elect any one or more of the foregoing remedies or any remedy
available at law or equity with respect to any particular SLA.

     17.3 Lessor's Default.  If Lessor:
          ----------------             

          17.3.1 Breaches any material representation, warranty or agreement set
forth in this Agreement; or

          17.3.2 Fails to perform or observe any other term of the applicable
SLA, including terms and conditions applicable thereto contained in this
Agreement, and such failure continues for more than fifteen (15) days after
written notice from Lessee; except such fifteen (15) day cure period will be
extended as reasonably necessary to permit Lessor to complete a cure so long as
Lessor commences cure within such fifteen (15) day cure period and thereafter
continuously and diligently pursues and completes such cure;

     Lessee may, in addition to any other remedy available at law or in equity,
at Lessee's option upon written notice:

          17.3.3 Terminate the applicable SLA; or

          17.3.4 Incur any expense reasonably necessary to perform the
obligation of Lessor specified in such notice and invoice Lessor for the actual
expenses, together with interest from the date named at the Past Due Interest
Rate. Any invoice shall be accompanied by documentation reasonably detailing
actual expenses. If Lessor fails to reimburse the costs within thirty (30) days
of receipt of written invoice, then Lessee is entitled to offset and deduct such
expenses from the Fees or other charges next becoming due under any SLA.

     Lessee may elect any one or more of the foregoing remedies with respect to
any particular SLA.

     17.4 Duty to Mitigate Damages. Lessee and Lessor shall endeavor in good
          ------------------------                                          
faith to mitigate damages arising under this Agreement.


                        18. COVENANT OF QUIET ENJOYMENT
                            ---------------------------

     Lessor covenants and warrants that Lessee or any successor permitted by
Section 13.1 or other transferees approved by 

                                       22
<PAGE>
 
Lessor, upon the payment of Fees and performance of all the terms, covenants and
conditions under this Agreement, will have, hold and enjoy each Property leased
under a SLA during the term of the applicable SLA or any renewal or extension
thereof. Lessor will take no action not expressly permitted under the terms of
this Agreement that will interfere with Lessee's intended use of the Property,
nor will Lessor fail to take any action or perform any obligation necessary to
fulfill Lessor's aforesaid covenant of quiet enjoyment in favor of Lessee.


                          19. COVENANTS AND WARRANTIES
                              ------------------------

     19.1 Lessor. Lessor warrants, with respect to each particular SLA that:
          ------                                                            

          19.1.1 Lessor or the entity for which Lessor possesses the exclusive
management rights, owns good marketable fee simple title, has a good and
marketable leasehold interest, has the right as manager, or has a valid license
or easement in the land on which the Site and Property are located and has
rights of access thereto pursuant to a ground lease;

          19.1.2 Lessor will not permit or suffer the installation and existence
of any other improvement (including, without limitation, transmission or
reception devices) upon the structure or land of which any Site or Property is a
portion if such improvement materially interferes with transmission or reception
by Lessee's communications facility in any manner whatsoever; and

          19.1.3 The Property is to the best of the knowledge of Lessor not
contaminated by any Environmental Hazards (as defined in Section 21).

          19.1.4. Lessor represents that telephone and electrical service are
currently available at the Site. In the event that Lessor fails to make such
telephone and electrical service available to the Site, Lessor agrees that:

          19.1.4.1. The Property includes such non-exclusive easement rights as
are necessary to enable Lessee to connect utility wires, cables, fibers and
conduits to the communication facility; and

          19.1.4.2. Lessor has no right to prevent such 

                                       23
<PAGE>
 
installation, except Lessor does have the right to approve the manner or
installation so long as such approval is not unreasonably withheld, conditioned
or delayed.

     19.2 Mutual. Each party represents and warrants to the other party that:
          ------                                                             

          19.2.1 It has full right, power and authority to make this Agreement
and to enter into the SLAs;

          19.2.2 The making of this Agreement and the performance thereof will
not violate any laws, ordinance, restrictive covenants, or other agreements
under which such party is bound;

          19.2.3 Such party is a duly organized and existing corporation or
limited partnership;

          19.2.4 The party is qualified to do business in any state in which the
Property and Sites are located; and

          19.2.5 All persons signing on behalf of such party were authorized to
do so by appropriate corporate or partnership action.

     19.3 Lessee.  Lessee warrants, with respect to each particular SLA that:
          ------                                                             

          19.3.1 Lessee will maintain the antennas, transmission lines and other
appurtenances in proper operating condition and maintain same as to appearance
and safety; and

          19.3.2 All installations and operations by Lessee in connection with
this Agreement shall meet all applicable rules and regulations of the FCC and
all applicable codes and regulations of the municipality, county and state where
the Site is located. Lessor assumes no responsibility for the licensing,
operation and/or maintenance of Lessee's radio equipment.

     19.4 No Brokers.  Lessee and Lessor represent to each other that neither
          ----------                                                         
has had any dealings with any real estate brokers in connection with the
negotiation of this Agreement.


                            20.  DISPUTE RESOLUTION
                                 ------------------

     20.1 General.  Except as provided otherwise in this Agreement, any
          -------                                                      
controversy between the parties arising out of 

                                       24
<PAGE>
 
this Agreement or any SLA, or breach thereof, is subject to the mediation
process described below. If not resolved by mediation, then the matter may, if
mutually agreed upon by the parties, be submitted to the American Arbitration
Association ("AAA") for arbitration before a sole arbitrator in the city nearest
Lessor's regional office nearest the location of the Site in dispute.

     20.2 Procedure.  A meeting will be held promptly between the parties to
          ---------                                                         
attempt in good faith to negotiate a resolution of the dispute. The meeting will
be attended by individuals with decision making authority regarding the dispute.
If within thirty (30) days after such meeting the parties have not succeeded in
resolving the dispute, they will, within fifteen (15) days thereafter submit the
dispute to a mutually acceptable third-party mediator who is acquainted with
dispute resolution methods. Lessor and Lessee will participate in good faith in
the mediation and the mediation process. The mediation shall be nonbinding. If
the dispute is not resolved by mediation the parties may jointly, but shall not
be required to, initiate an arbitration with the AAA, and the dispute may be
resolved by binding arbitration under the rules and administration of the AAA,
and judgment upon the award rendered by the arbitrator(s) may be entered in any
court having jurisdiction thereof. Neither party is entitled to seek or recover
punitive damages in considering or fixing any award under these proceedings. The
parties agree that with respect to the interference issues set forth in Sections
5.1 or 19.1.2, either party may elect to bypass the foregoing resolution
mechanism and proceed directly for injunctive relief in the state or federal
courts located in Allegheny County, Pennsylvania.

     20.3 Costs.  The costs of mediation and arbitration, including any
          -----                                                        
mediator's fees, AAA administration fee, the arbitrators' fee, and costs for the
use of facilities during the hearings, shall be borne equally by the parties.
Reasonable attorneys fees, costs and expenses may be awarded to the prevailing
party (provided such a party can clearly be determined from the proceedings) at
the discretion of the arbitrator. Each party's other costs and expenses will be
borne by the party incurring them.


                           21.  ENVIRONMENTAL MATTERS
                                ---------------------

     Lessor represents and warrants that to the best of Lessor's knowledge there
are no Environmental Hazards on any Site. Nothing in this Agreement or in any
SLA will be construed or interpreted 

                                       25
<PAGE>
 
to require that Lessee remediate any Environmental Hazards located at any Site
unless Lessee or Lessee's officers, employees, agents, or contractors placed the
Environmental Hazards on the Site.

     Lessee will not bring to, transport across or dispose of any Environmental
Hazards on any particular Property or Site without Lessor's prior written
approval, which approval shall not unduly be withheld except Lessee may keep on
the Property substances used in back up power units (such as batteries and
diesel generators) commonly used in the wireless telecommunications industry.
Lessee's use of any approved substances constituting Environmental Hazards must
comply with all applicable laws, ordinances, and regulations governing such use.

     The term "Environmental Hazards" means hazardous substances, hazardous
wastes, pollutants, asbestos, polychlorinated biphenyl (PCB), petroleum or other
fuels (including crude oil or any fraction or derivative thereof) and
underground storage tanks. The term "hazardous substances" shall be as defined
in the Comprehensive Environmental Response, Compensation, and Liability Act,
and any regulations promulgated pursuant thereto. The term "pollutants" shall be
as defined in the Clean Water Act, and any regulations promulgated pursuant
thereto. This Section shall survive termination of the Agreement and any
particular SLA.


                               22. SUBORDINATION
                                   -------------

     22.1. Agreement.  Lessee agrees that this Agreement and each SLA is subject
           ---------                                                            
and subordinate at all times to the lien of all mortgages and deeds of trust
securing any amount or amounts whatsoever which may now exist or hereafter be
placed on or against the Premises or on or against Lessor' s interest or estate
therein, and any underlying ground lease or master lease on a particular Site,
all without the necessity of having further instruments executed by Lessee to
effect such subordination, but, with respect to any such liens or leases which
arise following execution of this Agreement, only upon the condition that any
such mortgagee, beneficiary, trustee or ground lessor expressly agrees not to
disturb the rights of Lessee under this Agreement and each SLA.

     22.2 SLA.  Each SLA is subject to any restrictions or other terms or
          ---                                                            
conditions contained in the underlying ground lease. Lessee agrees to commit no
act or omission which would constitute 

                                       26
<PAGE>
 
a default under any ground lease that has been provided to Lessee.

     Lessor is not required to obtain any consent from the landlord under such
Ground Lease in order for Lessee to construct, operate, maintain or access the
communications facility, unless expressly set forth in the applicable SLA.

     If a particular restriction contained in a ground lease and not set forth
on the applicable SLA prevents Lessee from the construction, operation or
maintenance of or access to the communications facility, Lessee is entitled to
terminate the applicable SLA, without further liability of either party to the
other.

     Upon the expiration or termination of any ground lease, with respect to a
particular Site, the SLA relating to such Site shall automatically terminate
without further liability of either party to the other. Lessee acknowledges that
many of Lessor's underlying leases or licenses may grant to the property owner
the right to terminate such underlying leases or licenses on the Site, and that
in the event of such termination, the SLA with respect to such Site shall
terminate concurrently herewith.

     Lessor agrees that Lessor will not breach the terms or conditions of any
ground lease in a manner that affects Lessee's use of the Property.

                                       27
<PAGE>
 
                             23. GENERAL PROVISIONS
                                 ------------------

     23.1 Entire Agreement.  This Agreement and each SLA constitutes the entire
          ----------------                                                     
agreement and understanding between the parties, and supersedes all offers,
negotiations and other agreements concerning the subject matter contained in
this Agreement. There are no representations or understandings of any kind not
set forth in this Agreement. Any amendments to this Agreement or any SLA must be
in writing and executed by both parties.

     23.2 Severability.  If any provision of this Agreement or any SLA is
          ------------                                                   
invalid or unenforceable with respect to any party, the remainder of this
Agreement, the applicable SLA or the application of such provision to persons
other than those as to whom it is held invalid or unenforceable, is not to be
affected and each provision of this Agreement or the applicable SLA is valid and
enforceable to the fullest extent permitted by law.

     23.3 Binding Effect.  This Agreement and each SLA will be binding on and
          --------------                                                     
inure to the benefit of the respective parties' successors and permitted
assignees.

     23.4 Captions.  The captions of this Agreement are inserted for convenience
          --------                                                              
only and are not to be construed as part of this Agreement or the applicable SLA
or in any way limiting the scope or intent of its provision.

     23.5 No Waiver.  No provision of this Agreement or a SLA will be deemed to
          ---------                                                            
have been waived by either party unless the waiver is in writing and signed by
the party against whom enforcement is attempted. No custom or practice which may
develop between the parties in the administration of the terms of this Agreement
or any SLA is to be construed to waive or lessen any party's right to insist
upon strict performance of the terms of this Agreement or any SLA. The rights
granted in this Agreement and under each SLA is cumulative of every other right
or remedy that the enforcing party may otherwise have at law or in equity or by
statute and the exercise of one or more rights or remedies will not prejudice or
impair the concurrent or subsequent exercise of other rights or remedies.

     The parties acknowledge and agree that they have been represented by
counsel and that each of the parties has participated in the drafting of this
Agreement and each SLA. 

                                       28
<PAGE>
 
Accordingly, it is the intention and agreement of the parties that the language,
terms and conditions of this Agreement and each SLA are not to be construed in
any way against or in favor of any party hereto by reason of the
responsibilities in connection with the preparation of this Agreement or each
SLA.

     23.6 Notices.  Any notice or demand required to be given in this Agreement
          -------                                                              
shall be made by certified or registered mail, return receipt requested or
reliable overnight courier to the address of other parties set forth below:

           Lessor:  Crown Communications
                    Penn Center West III, Suite 229
                    Pittsburgh, PA 15276
                    Attn: Robert A. Crown
   
           Lessee:  APT Pittsburgh Limited Partnership
                    801 Commonwealth Drive
                    Warrendale, PA 15086
                    Attn: Director of Engineering and Operations

   With a Copy To:  American Portable Telecom
                    Real Estate Department
                    P.O. Box 31793
                    Chicago, IL 60631-0793

     Any such notice is deemed received one (1) business day following deposit
with a reliable overnight courier or five (5) business days following deposit in
the United States mails addressed as required above. Lessor or Lessee may from
time to time designate any other address for this purpose by written notice to
the other party.

     23.7 Governing Law.  This Agreement and each SLA is governed by the laws of
          -------------                                                         
the Commonwealth of Pennsylvania. Notwithstanding the foregoing, in the event of
a dispute over a particular Site or Property, the laws of the state where the
Site and Property are located shall govern.

     23.8 No Liens.  Each communications facility and related appurtenances
          --------                                                         
located upon any Property by Lessee pursuant to the terms of this Agreement and
the applicable SLAs will at all times be and remain the property of Lessee and
will not be subject to any lien or encumbrance created or suffered by Lessor.
Lessee has the right to make such public filings as it deems necessary or

                                       29
<PAGE>
 
desirable to evidence Lessee's ownership of the communications facility. Lessor
waives all lessor's or landlord's lien on any property of Lessee (whether
created by statute or otherwise). Notwithstanding the foregoing, in the event of
termination or expiration of a SLA, if all of the communications facility
located on the Property is not removed within thirty (30) days following such
termination or expiration, such equipment remaining shall be deemed abandoned
and Lessor's waiver of lien shall thereafter be void and of no further force and
effect.

     23.9 Force Majeure.  If a party is delayed or hindered in, or prevented
          -------------                                                     
from the performance required under this Agreement (except for payment of
monetary obligations) by reason of earthquakes, landslides, strikes, lockouts,
labor troubles, failure of power, riots, insurrection, war, acts of God or other
reason of like nature not the fault of the party delayed in performing work or
doing acts, such party is excused from such performance for the period of delay.
The period for the performance of any such act shall then be extended for the
period of such delay.

     23.10 Time is of the Essence.  Time is of the essence with respect to the
           ----------------------                                             
provisions of this Agreement and each SLA.

     23.11 Independent Contractor Agreement.  The provisions of that certain
           --------------------------------                                 
Independent Contractor Agreement executed by APT and by Crown Network Systems,
Inc. of even date herewith are incorporated herein by reference as though set
forth in their entirety.


                               24. NON-DISCLOSURE
                                   --------------

     The parties agree that without the express written consent of the other
party, neither party shall reveal, disclose or promulgate to any third party the
terms contained in this Agreement or any Exhibit or SLA to it, except to such
third party's auditor, accountant or attorney or to a governmental agency as
required by regulation, subpoena or governmental order to do so.

     Lessee intends to protect its proprietary information, including
proprietary information which may be disclosed during business transactions with
the Lessor.  Lessee has devoted substantial time and expense in the field of
wireless communications and, in doing so, have acquired proprietary 

                                       30
<PAGE>
 
information which they desire to remain confidential in order to promote their
corporate growth and security. The business relationship between and among
Lessee and Lessor will entail the possible disclosure of certain proprietary
information to one another, including, among other things, information regarding
each parties' respective assets, liabilities, operations, financial conditions,
employees, plans, prospects, management, investors, products, strategies and
techniques, the technical characteristics and operations of each party's
products, and the identity of suppliers and customers and the nature and extent
of their business relationships with such party. Therefore, Lessee and Lessor
agree to the following conditions:

     a)   All proprietary information of Lessee will be treated with the
          strictest confidence. Lessor will not disclose proprietary information
          to any third party and will not make use of that proprietary
          information, except for such information necessary to transact
          business between Lessee and Lessor. The Lessor shall not provide
          proprietary information to individuals not significantly involved in
          the proposed transaction.

     b)   The Lessor shall not develop any new techniques or ideas relating to
          Lessee's proprietary information that would have a negative impact on
          Lessee's competitiveness.

     For purposes of this Paragraph 8, Lessee's RF design criteria and search
areas are deemed to be proprietary.  "Proprietary information" shall not be
deemed to include any information available in the marketplace or disclosed to
Lessor independently by a third party.

          IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.

LESSEE:                             LESSOR:
APT PITTSBURGH LIMITED              CROWN COMMUNICATIONS
PARTNERSHIP

By: [Illegible signature]            /s/ Robert A. Crown
   --------------------------       ----------------------------
                                    Robert A. Crown
Title:
      -----------------------
<PAGE>
 
                   EXHIBIT "A" TO THE MASTER LEASE AGREEMENT

                           SITE LEASE ACKNOWLEDGMENT
                           -------------------------


          This Site Lease Acknowledgment ("SLA") is made and entered into as of
this ______ day of __________________, 19____ by and between Robert A. Crown,
d/b/a CROWN COMMUNICATIONS ("Lessor") and APT PITTSBURGH LIMITED PARTNERSHIP
("Lessee"), pursuant and subject to that certain Agreement ("Agreement") by and
between the parties hereto, dated as of __________________, 1996. All
capitalized terms have the meanings ascribed to them in the Master Lease
Agreement.

     1.   The Parcel will consist of that certain parcel of property located in
          the City of    ___________________________, the County of
          ___________________, and the State of ______________________________,
          more particularly described as a _________________ by
          _________________ parcel containing approximately ________ square feet
          situated at ______________________ (add legal description), together
          with the non-exclusive right for ingress and egress, seven (7) days a
          week, twenty four (24) hours a day, on foot or motor vehicle,
          including trucks, and for the installation and maintenance of utility
          wires, poles, cables, conduits and pipes over, under or along a
          _______ wide right-of-way extending from the nearest public right-of-
          way, _________________ to the demised premises, said premises and
          right-of-way for access being substantially as described herein in
          Exhibit "1" to the SLA attached hereto and made a part hereof.

     2.   Lessee's antenna(s) will consist of ______ antennas, each described in
          terms of type, size, frequency, effective radiated power and height on
          the structure outlined as follows:

Manufacturer and Type-Number:                 _________________________

Number of Antennas:                           _________________________

Weight and Dimension of Antenna(s):           _________________________

Transmission Line Mfg. and Type No.:          _________________________
<PAGE>
 
Diameter and Length of Transmission Line:     _________________________

Height of Antenna(s) on Structure:            _________________________

Direction of Radiation:                       _________________________

Equipment Building/Floor Space
Dimensions:                                   _________________________

Frequencies/Max Power Output                  _________________________

3.   The Fee due and payable by Lessee to Lessor is $____________ per year.

4.   The commencement date of this SLA will be upon commencement of construction
     at the Property ("Commencement Date"). For purposes of this SLA, any
     physical activity on the Site by Lessee, other than those preliminary
     activities set forth in Article 4 of the Agreement, shall constitute the
     commencement of the construction.

5.   The parties acknowledge that Lessor's rights in the property derive from a
     certain Lease Agreement dated _________________between Lessor herein and
     APT Pittsburgh Limited Partnership  hereinafter referred to as the "Prime
     Lease" and attached hereto as Exhibit "2" to the SLA.

          IN WITNESS WHEREOF, the parties hereto have set their hands the day
and year first above written.


WITNESS:                                CROWN COMMUNICATIONS

__________________________________      __________________________________
                                           Robert A. Crown

WITNESS OR ATTEST:                      APT PITTSBURGH LIMITED PARTNERSHIP


__________________________________      By:_______________________________

                                        Title:____________________________
<PAGE>
 
                  EXHIBIT "A-1" TO THE MASTER LEASE AGREEMENT

                           BELL ATLANTIC NYNEX MOBILE

                           SITE LEASE ACKNOWLEDGMENT
                           -------------------------


          This Site Lease Acknowledgment ("SLA") is made and entered into as of
this ________ day of _____________, 19_____ by and between Robert A. Crown,
d/b/a CROWN COMMUNICATIONS ("Lessor") and APT PITTSBURGH LIMITED PARTNERSHIP
("Lessee"), pursuant and subject to that certain Agreement ("Agreement") by and
between the parties hereto, dated as of _______________, 1996. All capitalized
terms have the meanings ascribed to them in the Master Lease Agreement.

1.   The Parcel will consist of that certain parcel of property located in the
     City of _______________________________, the County of
     ________________________________, and the State of
     __________________________, more particularly described as a
     ________________________ by _________________ parcel containing
     approximately ___________ square feet situated at ____________________ (add
     legal description), together with the non-exclusive right for ingress and
     egress, seven (7) days a week, twenty four (24) hours a day, on foot or
     motor vehicle, including trucks, and for the installation and maintenance
     of utility wires, poles, cables, conduits and pipes over, under or along a
     ________ wide right-of-way extending from the nearest public right-of-way,
     ____________ to the demised premises, said premises and right-of-way for
     access being substantially as described herein in Exhibit "1" to the SLA
     attached hereto and made a part hereof.

2.   Lessee's antenna(s) will consist of _______ antennas, each described in
     terms of type, size, frequency, effective radiated power and height on the
     structure outlined as follows:

Manufacturer and Type-Number:                 _______________________

Number of Antennas:                           _______________________

Weight and Dimension of Antenna(s):           _______________________
<PAGE>
 
Transmission Line Mfg. and Type No.:          _______________________

Diameter and Length of Transmission Line:     _______________________

Height of Antenna(s) on Structure:            _______________________

Direction of Radiation:                       _______________________

Equipment Building/Floor Space
Dimensions:                                   _______________________

Frequencies/Max Power Output                  _______________________

3.   The annual lease fee due and payable by Lessee to Lessor is $_________ per
     year.

4.   The commencement date of this SLA will be upon commencement of construction
     at the Property ("Commencement Date"). For purposes of this SLA, any
     physical activity on the Site by Lessee, other than those preliminary
     activities set forth in Article 4 of the Agreement, shall constitute the
     commencement of the construction.

5.   The parties acknowledge that Lessor's rights in the property derive from a
     certain Lease Agreement dated _________________between Lessor herein and
     APT Pittsburgh Limited Partnership hereinafter referred to as the "Prime
     Lease" and attached hereto as Exhibit "2" to the SLA.

          IN WITNESS WHEREOF, the parties hereto have set their hands the day
and year first above written.

WITNESS:                                    CROWN COMMUNICATIONS

______________________________________      ___________________________________ 
                                            Robert A. Crown

 
WITNESS OR ATTEST:                          APT PITTSBURGH LIMITED PARTNERSHIP

______________________________________      By:________________________________

                                            Title:_____________________________
<PAGE>
 
                                 EXHIBIT "A-2"

                Memorandum of Site Lease Acknowledgment (Lease)

Site Name:_____________________     Site I.D.__________________


This Memorandum evidences that a lease was made and entered into by written Site
Lease Acknowledgment dated _____________________, 19______ between Crown
Communications, a sole proprietorship ("Owner") and APT PITTSBURGH LIMITED
PARTNERSHIP ("APT"), the terms and conditions of which are incorporated herein
by reference.

Such agreement provides in part that Owner leases to APT Pittsburgh Limited
Partnership a certain site ("Site") located on _______________ within the
property of Owner which is described in Exhibit "A" attached hereto, with grant
of easement for unrestricted rights of access thereto and to electric and
telephone facilities for a term of _________ (____) years commencing on
__________________________, 19________ which term is subject to __________
(____) additional ___________ (____) year extension periods by APT Pittsburgh
Limited Partnership.

IN WITNESS WHEREOF, the parties have executed the Memorandum as of the day and
year first above written.

OWNER
CROWN COMMUNICATIONS                          WITNESS:

_________________________________________     _________________________________
         Robert A. Crown

Address:  Penn Center West III, Suite 229
          Pittsburgh, PA 15276

APT
APT PITTSBURGH LIMITED PARTNERSHIP            WITNESS OR ATTEST:

By:______________________________________     _________________________________

Address:  801 Commonwealth Drive
          Warrendale, PA 15086
<PAGE>
 
                                  EXHIBIT "A"

                   TO MEMORANDUM OF SITE LEASE ACKNOWLEDGMENT


Site Name:____________________________   Site I.D.:____________________________

Legal Description of Property:
<PAGE>
 
COMMONWEALTH OF PENNSYLVANIA

COUNTY OF_____________________________

The foregoing instrument was acknowledged before me this _______ day of
____________________, 19_______, by ROBERT A. CROWN.



_________________________________
Notary Public



COMMONWEALTH OF PENNSYLVANIA

COUNTY OF________________________

The foregoing instrument was acknowledged before me this ______ day of
______________________, 19_____, by _____________________,
____________________________________, on behalf of APT Pittsburgh Limited
Partnership.



__________________________________ 
Notary Public
<PAGE>
 
                                  EXHIBIT "B"

A. 1-29 SITES
   ----------

Crown Towers/1/                                  Annual Lease Fee
- -----------------------------------------------------------------

Up to six (6) antenna placements at any                [*]
available height.

Up to nine (9) antenna placements at any               [*]
available height.


Crown Building Tops/2/                          Annual Lease Fee
- ----------------------------------------------------------------

Up to six (6) antenna placements.                      [*]

Up to nine (9) antenna placements.                     [*] 


BANM Towers or Monopoles/3/                    Annual Lease Fee
- ---------------------------------------------------------------

Up to six (6) antenna placements                       [*]
at any available height.

Up to nine (9) antenna placements                      [*]
at any available height.

- ---------------
/1/    Pricing provides for up to a 12' x 20' equipment pad (outside).  Lessee
       may rent a 12' x 10' area inside Lessor's equipment building, if
       available or if required, at an annual rental rate of [*].
/2/    Pricing provides for up to a 12' x 10' area inside building unless
       otherwise specified in SLA.
/3/    Pricing provides for up to a 12' x 10' equipment pad (outside).  Lessee
       may rent a 12' x 10' area inside Lessor's equipment building, if
       available or if required, at an annual rental rate of [*].


[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.


<PAGE>
 
B. 30-39 SITES
   -----------

Crown Towers/1/                                 Annual Lease Fee
- ----------------------------------------------------------------

Up to six (6) antenna placements at any                [*]
available height.

Up to nine (9) antenna placements at any               [*]
available height.


Crown Building Tops/2/                          Annual Lease Fee
- ----------------------------------------------------------------

Up to six (6) antenna placements.                      [*]

Up to nine (9) antenna placements.                     [*]


BANM Towers or Monopoles/3/                     Annual Lease Fee
- ----------------------------------------------------------------

Up to six (6) antenna placements                       [*]
at any available height.

Up to nine (9) antenna placements                      [*]
at any available height.

- ---------------
/1/    Pricing provides for up to a 12' x 10' equipment pad (outside).  Lessee
       may rent a 12' x 10' area inside Lessor's equipment building, if
       available or if required, at an annual rental rate of [*].
/2/    Pricing provides for up to a 12' x 10' area inside building unless
       otherwise specified in SLA.
/3/    Pricing provides for up to a 12' x 10' equipment pad (outside). Lessee
       may rent a 12' x 10' area inside Lessor's equipment building, if
       available or if required, at an annual rental rate of [*].


[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.


<PAGE>
 
C.   40-49 SITES
     -----------

Crown Towers/1/                                  Annual Lease Fee
- -----------------------------------------------------------------

Up to six (6) antenna placements at any                [*]
available height.

Up to nine (9) antenna placements at any               [*]
available height.


Crown Building Tops/2/                          Annual Lease Fee
- ----------------------------------------------------------------

Up to six (6) antenna placements.                      [*]

Up to nine (9) antenna placements.                     [*]


BANM Towers or Monopoles/3/                    Annual Lease Fee
- ---------------------------------------------------------------

Up to six (6) antenna placements                       [*]
at any available height.

Up to nine (9) antenna placements                      [*]
at any available height.

- ---------------
/1/    Pricing provides for up to a 12' x 20' equipment pad (outside).  Lessee
       may rent a 12' x 10' area inside Lessor's equipment building, if
       available or if required, at an annual rental rate of [*].
/2/    Pricing provides for up to a 12' x 10' area inside building unless
       otherwise specified in SLA.
/3/    Pricing provides for up to a 12' x 10' equipment pad (outside).  Lessee
       may rent a 12' x 10' area inside Lessor's equipment building, if
       available or if required, at an annual rental rate of [*].

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.
<PAGE>
 
D.   50 OR MORE SITES
     ----------------

Crown Towers/1/                                 Annual Lease Fee
- ----------------------------------------------------------------

Up to six (6) antenna placements at any               [*]
available height.

Up to nine (9) antenna placements at any              [*]
available height.


Crown Building Tops/2/                         Annual Lease Fee
- ---------------------------------------------------------------

Up to six (6) antenna placements.                      [*]

Up to nine (9) antenna placements.                     [*]


BANM Towers or Monopoles/3/                   Annual Lease Fee
- --------------------------------------------------------------

Up to six (6) antenna placements                       [*]
at any available height.

Up to nine (9) antenna placements                      [*]
at any available height.


     In addition to the foregoing sums, the parties agree that Lessor will
perform all construction and antenna installation work on all Sites at an agreed
upon market rate.

     In the event a monopole erected on a Site owned, leased, licensed or
otherwise controlled by BANM will not support Lessee's communications facility
and would require upgrading, Lessee, at its option, may elect to have such
monopole upgraded and pay within thirty (30) days of invoicing by Lessor a sum
equal to 25% of the cost of such upgrading.  If Lessee elects not to have such
monopole upgraded, Lessor shall not be entitled to 

- ---------------
/1/    Pricing provides for up to a 12' x 20' equipment pad (outside).  Lessee
       may rent a 12' x 10' area inside Lessor's equipment building, if
       available or if required, at an annual rental rate of  [*].
/2/    Pricing provides for up to a 12' x 10' area inside building unless
       otherwise specified in SLA.
/3/    Pricing provides for up to a 12' x 10' equipment pad (outside).  Lessee
       may rent a 12' x 10' area inside Lessor's equipment building, if
       available or if required, at an annual rental rate of  [*].

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
receive the payment described in Section 2.3 of this Agreement. If Lessee elects
not to have such monopole upgraded, Lessor shall have the option, exercisable in
writing within thirty (30) days of such notification by Lessee, to construct a
Site suitable for Lessee's communications facility according to the pricing
schedule set forth in this Agreement and in the Independent Contractor Agreement
of even date herewith. The Site shall become operational within one hundred
eighty (180) days of the date Lessor exercises its option.
<PAGE>
 
                                  Exhibit "C"

                                Revision: 4/6/95
                                 SITE STANDARDS
                                 --------------


I.   GENERAL

A.   PURPOSE The purpose of these Site Standards is to create a quality site
     installation. These standards are to be in effect for each site at which
     LESSEE has equipment in, on or at the site and at which LESSEE has a right
     to occupy pursuant to the Agreement to which this document is an
     attachment.

B.   STATE AND NATIONAL STANDARDS

1.   All installations must conform with all state and national regulations and
     the following state and national codes or any supplements, amendments or
     provisions which supersede them:

     a.   American National Standards Institute:
          ANSI/EAI-222E Structural Standards for Steel Antenna Towers and
          Antenna Supporting Structures
     b.   Federal Aviation Administration Regulations:
          Vol. XI, Part 77 Objects Affecting Navigable Airspace
          Advisory Circular Obstruction Marking and Lighting AC 70/7460
          Advisory Circular High Intensity Obstruction Lighting Systems AC
          150/5345-43,
          FAA,/DOD Specifications L-856
     c.   Federal Communications Commission Rules and Regulations:
          Code of Federal Construction, Marking and Lighting of Antenna
          Regulations Title 47 Structures Chapter I, Part 17
     d.   National Electrical Code
     e.   Building Officials and Code Administrators International, Inc.
          Basic National Building Code
          Basic National Mechanical Code
          State Building Code
     f.   National Fire Protection Association
          Code 101 - Life Safety
          Code 90A - Air Conditioning and Ventilating Systems
          Code 110 - Emergency and Standby Power Systems
     g.   State Fire Safety Code
<PAGE>
 
     h.   Occupational Safety and Health Administration
          Safety and Health Standards (29 CFR 1910) General Industry
          Subpart R Special Industries
          1910.268 Telecommunications
          1926.510 Subpart M Fall Prevention
     i.   Motorola Grounding Guideline for Cellular Radio Installations,
          Document No. 68P81150E62, 7/3/92 OR
          AT&T AUTOPLEX(C) Cellular Telecommunications Systems, Lightning
          Protection and Grounding, Customer

          Information Bulletin 148B, August 1990, or latest revision OR Fluor
          Daniel Grounding Specifications for American Portable Telecom Project,
          Section 16670, or latest revision.

C.   GENERAL/APPROVAL

1.   All users shall furnish the following to LESSOR prior to installation of
     any equipment:

     a. Completed Application. (LESSEE must make new Application to LESSOR for
        change in Antenna position or type.)
     b. Fully executed SLA.
     c. Copies of FCC Licenses and construction/building permits.
     d. Final site plan outlining property boundaries, improvements, easements
        and access.
     e. Accurate block diagrams showing operating frequencies, all system
        components (active or passive) with gains and losses in dB, along with
        power levels.

2.   The following will not be permitted at the facility without the prior
     written consent of LESSOR.

     a. Any equipment without FCC type acceptance or equipment which does not
        conform to FCC rules and regulations.
     b. Add-on power amplifiers.
     c. "Hybrid" equipment with different manufacturers' RF strips.
     d. Open rack mounted receivers and transmitters.
     e. Equipment with crystal oscillator modules which have not been
        temperature compensated.
     f. DigitaVanalog hybriding in exciters, unless type-accepted.
     g. Non-continuous duty rated transmitters used in continuous duty
        applications.
     h. Transmitter outputs without a harmonic filter and antenna matching
        circuitry.
<PAGE>
 
     i. Change in range of operating frequencies.
     j. Ferrite devices looking directly at an antenna.
     k. Nickel plated connectors.
     l. Cascaded receiver multicouplers/preamps.

3.   All emergencies are to be reported immediately to 1-800-852-2671.

D.   LIABILITY

It shall be the responsibility of the LESSEE to comply with all of the site
standards set forth herein. The LESSEE specifically agrees to indemnify and hold
harmless the LESSOR against any claim of liability, loss, damage or costs
including reasonable attorney's fees, arising out of or resulting from LESSEE's
non-compliance with the standards set forth herein.

E.   INSPECTION

LESSOR reserves the right to inspect LESSEE' s area without prior notice at any
time during the term of the Agreement in order to ensure compliance with the
standards set forth herein. Any such inspection shall be solely for the benefit
and use of the LESSOR and does not constitute any approval of or acquiescence to
the conditions that might be revealed during the course of the inspection.

LESSOR reserves the right to inspect LESSOR's area without prior notice.

F.   DISCLAIMER OF RESPONSIBILITY

It is the intention of LESSOR and LESSEE that the standards set forth herein are
part of the Agreement between them. It is specifically agreed that they are not
intended to be relied upon or to benefit any third party. Further, the LESSOR
shall have no liability or responsibility to any third party as a result of the
establishment of the standards set forth herein, any inspection by the LESSOR of
LESSEE's area in order to determine compliance with the standards, the
sufficiency or lack of sufficiency of the standards, or LESSEE's compliance or
non-compliance with the standards and the LESSEE agrees to indemnify and hold
harmless the LESSOR against any claim by a third party resulting from such
theories.
<PAGE>
 
II.  RADIO FREQUENCY INTERFERENCE PROTECTIVE DEVICES

A.   If due to LESSEE's use or proposed use, there exists any change to the RF
     environment it will be at LESSOR's sole discretion to require any or all of
     the following:

1.   IM protection panels can be installed in lieu of separate cavity and
     isolator configurations. LESSOR approval reacquired.
2.   30-76 MHZ
     - Isolators required
     - TX output cavity - minimum of 20 Db rejection @ plus or minus 5 MHZ
3.   130-174 MHZ
     - Isolators - minimum of 30 Db with bandpass cavity
4.   406512Mhz
     - Isolators - minimum of 60 Db with bandpass cavity
5.   806-866 MHZ
     - Isolators - minimum of 60 Db with bandpass cavity
6.   866 MHZ and above - as determined by LESSOR.

B.   Additional protective devices may be required based upon LESSOR's
     evaluation of the following information:

1.   Theoretical Transmitter (TX) mixes.
2.   Antenna location and type
3.   Combiner/multicoupler configurations
4.   Transmitter specifications
5.   Receiver specifications
6.   Historical problems
7.   Transmitter to transmitter isolation
8.   Transmitter to antenna isolation
9.   Transmitter to receiver isolation
10.  Calculated and measured level of Intermodulative (IM) products
11.  Transmitter output power
12.  Transmitter Effective Radiated Power (ERP)
13.  Spectrum analyzer measurements
14.  Voltage Standing Wave Radio (VSWR) measurements
15.  Existing cavity selectivity

C.   LESSEE will be required within a reasonable period to correct excessive
     cabinet leakage which causes interference to other tenants.

III. ANTENNAS AND ANTENNA MOUNTS

A.   All mounting hardware to be utilized by LESSEE to be as specified by tower
     manufacturer and approved by LESSOR.
<PAGE>
 
B.   Connections to be taped with stretch vinyl tape (Scotch #33-T or
     equivalent) and Scotchkoted or equivalent (including booted pigtails) or
     Nokia brand connectors.

C.   Must meet manufacturer's VSWR specifications.

D.   Any corroded elements must be repaired or replaced.

E.   Must be DC grounded type, or have the appropriate lightning protection as
     determined by LESSOR.

F.   No welding or drilling on mounts will be permitted.

G.   All antennas must be painted or impregnated with a color designated by
     LESSOR as the standard antenna color for aesthetic uniformity.


IV. CABLE

A.   All antenna lines to be approved by LESSOR, which approval shall not be
     unreasonably withheld or delayed.

B.   All transmission line(s) will be installed and maintained to avoid kinking
     and/or cracking.

C.   Tagged with weatherproof labels showing manufacturer, model, and owner' s
     name at both ends of cable run.

D.   Any cable fasteners exposed to weather must be stainless steel.

E.   All interconnecting cables, jumpers must have shielded outer conductor and
     approved by LESSOR, which approval shall not be unreasonably withheld or
     delayed.

F.   Internally, all cable must be run in troughs or on cable trays and on cable
     or waveguide bridges at intervals of no less than 3'. Externally, all cable
     must be attached with stainless steel hangers and non-corrosive hardware.

G.   All unused lines must be tagged at both ends showing termination points
     with the appropriate impedance termination at each end.

H.   All AC line cords must be 3 conductor with grounding plugs.

1.   All antenna transmission lines shall be grounded at both the antenna and
     equipment ends at the equipment ends and at building entry point, with the
     appropriate grounding kits.
<PAGE>
 
J.   All cables running to and from the exterior of the cabinet must be 100%
     ground shielded. Preferred cables are: Heliax, Superflex or braided grounds
     with foil wrap.


V.   CONNECTORS

A.   Must be Teflon filled, UHF or N type, including chassis/bulkhead connectors
     or be Nokia brand connectors.

B.   Must be properly fabricated (soldered if applicable) if field installed.

C.   Must be taped and Scotchkoted or equivalent at least 4" onto jacket if
     exposed to weather or be Nokia brand connectors.

D.   Male pins must be of proper length according to manufacturer's
     specifications.

E.   Female contacts may not be spread.

F.   Connectors must be pliers tight as opposed to hand tight.

G.   Must be silver plated or brass.

H.   Must be electrically and mechanically equivalent to Original Equipment
     Manufacturers (OEM) connectors.


VI.  RECEIVERS

A.   No RF preamps permitted in front end unless authorized by LESSOR.

B.   All RF shielding must be in place.

C.   VHF frequencies and higher must use helical resonator front ends.

D.   Must meet manufacturer's specifications, particularly with regard to
     bandwidth, discriminator, swing and symmetry, and spurious responses.

E.   Crystal filters/pre-selectors/cavities must be installed in RX legs where
     appropriate.

F.   All repeater tone squelch circuitry must use "AND" logic.
<PAGE>
 
VII. TRANSMITTERS

A.   Must meet original manufacturer's specifications.

B.   All RF shielding must be in place.

C.   Must have a visual indicator of transmitter operation.

D.   Must be tagged with LESSEE's name, equipment model number, serial number,
     and operating frequency(ies).

E.   All low-level, pre-driver and driver stages in exciter must be shielded.

F.   All power amplifiers must be shielded.

G.   Output power may not exceed that specified on LESSEE's FCC License.


VIII. COMBINERS/MULTICOUPLERS

A.   Shall at all times meet manufacturer's specifications.

B.   Must be tuned using manufacturer approval procedures.

C.   Must provide a minimum of 60 Db transmitter to transmitter isolation.

IX.  CABINETS

A.   All cabinets must be bonded together and to the equipment building ground
     system.

B.   All doors must be secured.

C.   All non-original holes larger than 1" must be covered with copper screen or
     solid metal plates.

D.   Current license for all operating frequencies should be mounted on the
     cabinet exterior for display at all times.


X.   INSTALLATION PROCEDURES

A.   Any tower work, except for emergency repairs or maintenance, must be
     scheduled with LESSOR using only LESSOR approved contractors at least 48
     hours in advance of site work. LESSOR's approval shall not be unreasonably
     withheld or 
<PAGE>
 
     delayed. LESSEE will be responsible for any and all fees associated with
     said work.

B.   Installation may take place only after LESSOR has been notified of the date
     and time in writing, and only during normal working hours unless otherwise
     authorized beforehand.

C.   Equipment may not be operated until final inspection of installation by
     LESSOR, which shall not be unreasonably withheld or delayed.

D.   Any testing periods are to be approved in advance by LESSOR and within the
     parameters as defined by LESSOR. LESSOR's approval shall not be
     unreasonably withheld or delayed.


XI.  MAINTENANCE TUNING PROCEDURES

A.   All external indicator lamps/LED's must be working.

B.   Equipment parameters must meet manufacturer's specifications.

C.   All cover, shield, and rack fasteners must be in place and securely
     tightened.

D.   Local speakers and/or orderwire systems must be turned off except during
     service, testing or other maintenance operations.


XII. INTERFERENCE DIAGNOSTIC PROCEDURES

The LESSEE must cooperate immediately with LESSOR when called upon to
investigate a source of interference, whether or not it can be conclusively
proven that LESSEE' s equipment is involved.


XIII. TOWER

This section deals with items which are to be mounted on, attached to or affixed
to the tower.

A.   ICE SHIELDS

At LESSOR's sole discretion, protective ice shields may be required and
manufacturer of ice shield will be determined by LESSOR.

B. CLIMBING BOLTS AND LADDERS

All attachments made to the tower shall be made in such a manner 
<PAGE>
 
as not to cause any safety hazard to other users or cause any restriction of
movement on, or to any climbing ladders, leg step bolts or safety cables
provided.

C. BRIDGE

1.   Installation of a cable bridge shall be at LESSOR's sole discretion and
     with LESSOR ' s approval. LESSOR's approval shall not be unreasonably
     withheld or delayed.
2.   If required, and in accordance with the manufacturers recommendations for
     the spacing of supports on horizontal runs for the particular type of cable
     or waveguide, the cable or waveguide shall be secured to the brackets on
     the bridge using clamps and hardware specifically manufactured for that
     purpose.
3.   No cable or waveguide run shall be clamped, tied or in any way affixed to a
     run belonging to LESSOR or any another licensee/lessee.

D.   CABLE LADDER AND WAVEGUIDE

1.   LESSEE shall install a ladder for the vertical routing of cable and
     waveguide. From the horizontal to vertical transition at the point where
     the bridge meets the tower to the point at which the cable or waveguide
     must leave the bridge to route to the antenna, all cable and waveguide is
     to be attached to the ladder in accordance with the recommendations of the
     manufacturer of the cable or waveguide.
2.   No cable or waveguide run shall be clamped, tied or any way affixed to a
     run belonging to LESSOR or any another licensee/lessee.

E.   DISTRIBUTION RUNS

1.   Cable or waveguide runs from the cable ladder to the point at which they
     connect to the antenna shall be routed along tower members in a manner
     producing a neat and professional site appearance.
2.   Cable and/or waveguide runs shall be specifically routed so as not to
     impede the safe use of the tower leg or climbing bolts, or to restrict the
     access of LESSOR or any another licensee/lessee.
3.   Distribution runs shall be clamped to the tower in accordance with the
     recommendations of the manufacturer of the cable or waveguide.
4.   No cable or waveguide run shall be clamped, tied or in any way affixed to a
     run belonging to LESSOR or any another licensee/lessee.
<PAGE>
 
F.   LENGTHS

1.   Cable and/or waveguide runs shall not be longer than necessary to provide a
     proper connection and normal maintenance and operation.
2.   No coiled lengths shall be permitted on the tower, bridge or on the ground.
<PAGE>
 
G.   ENTRY

1.   Entry of the cable or waveguide to the interior of the shelter shall be via
     ports provided in the shelter wall.
2.   Cable and/or waveguide entering a port shall be provided with a boot to
     seal the port; the boot shall be a Microflect or equivalent commercial
     product made specifically for the type of cable or waveguide and for
     diameter of the entry port, and approved by LESSOR before installation. It
     shall be installed in accordance with the instructions of the manufacturer
     and the port shall be sealed against the intrusion of moisture.


XIV. EQUIPMENT LOCATED WITHIN LESSOR'S EQUIPMENT BUILDING

A.   EQUIPMENT INSTALLATION REQUIREMENTS

1.   Any mounting to walls either outside or inside LESSOR's building must be
     pre-approved by LESSOR, which approval shall not be unreasonably withheld
     or delayed.
2.   All racks and equipment are to be plumb and true with the walls and floor
     of the shelter and reflect an installation consistent with the electrical
     and operational requirements of the equipment and appearance standards of a
     professional installation.
3.   Racks are to be bolted to the floor and aligned on the center line as in
     the site drawing provided to the LESSOR.
4.   Racks are not to be attached to the cable trays.

B.   TRANSMISSION LINES AND/OR WAVEGUIDE ROUTING

1.   Cable trays and/or troughs are required within the shelter for the routing
     of cable and waveguide to the equipment racks and termination points.
2.   All cable and waveguide shall be placed and secured to the cable tray.

C.   LENGTHS

1.   Cable and/or waveguide runs in the equipment shelter shall not be longer
     than necessary in order to provide a proper connection.
2.   While adequate slack for purposes of maintenance and operation is
     permitted, no coiled lengths on the tray or elsewhere in the shelter are
     permitted for normal maintenance and operation.
<PAGE>
 
XV.  GROUNDING

1.   The LESSEE must adhere to either the Motorola or AT&T grounding
     specification outlined above based on LESSOR's equipment at facility.
2.   All exterior grounding shall be C.A.D. welding.
3.   All antennas shall be bonded to the tower.
4.   Cable and waveguide shall be grounded as a minimum at three specific
     points, and for vertical runs in excess of 200 feet at intermediate points.
5.   All cable and waveguide shall be grounded to the tower at the point where
     the run effectively breaks from the tower for its connection to the
     antenna, using clamps and hardware specifically manufactured for that
     purpose.
6.   On the vertical portion of the cable or waveguide run, just above where it
     starts to make its transition from a vertical tower to a horizontal bridge
     run, all cable and waveguide shall be grounded to the tower using clamps
     and hardware specifically manufactured for that purpose.
7.   On the exterior of each shelter, at a point near the entry ports, a
     grounding plate must be provided for terminating ground leads brought from
     the cable and waveguide. Each cable and waveguide run shall be grounded at
     this point using clamps and hardware specifically manufactured for that
     purpose.
8.   On cable and waveguide installations where the vertical tower length
     exceeds 200 feet, the run shall be grounded at equally spaced intermediate
     points along the length of the run so as not to have a distance between
     grounding points longer than 100 feet.
9.   Cable and waveguide grounding leads shall connect to a separate point for
     each run to the common ground point.
10.  Grounding straps shall be kept to a minimum length and as near as possible
     to vertical down lead and shall be consistent with the restraints of
     protective dress and access.
11.  Grounding plates must be provided for single point access to the site
     grounding system. Each rack shall have a properly sized, insulated ground
     lead from the rack safety and signal grounds to one of the grounding points
     on the ground plate.
12.  The insulated ground lead shall follow the route of and be placed in the
     cable tray.
13.  Each rack shall be separately grounded.
14.  All modifications to grounding system must meet LESSOR's impedance
     specification.
<PAGE>
 
XVI. ELECTRICAL

1.   Power requirements must be approved, in advance by LESSOR.
2.   Polarized electrical outlets should be installed for all transmitters when
     possible.
3.   Surge protection is required for all base stations.


XVII. ELECTRICAL DISTRIBUTION

All electrical wiring from the distribution breaker panel shall be via rigid
metal conduit, thin wall, routed along the under side of the cable tray to a
point directly above the equipment rack. From this point, LESSEE may select how
to distribute to its equipment or rack.


XVIII. TEMPORARY LOADS

1.   Test equipment, soldering irons or other equipment serving a test or repair
     function may be used only if the total load connected to any single dual
     receptacle does not exceed 15 amps.
2.   Test equipment to be in place for more than seven (7) days will require
     prior approval of the LESSOR, which approval shall not be unreasonably
     withheld or delayed.


XIX. HEATING, VENTILATING, AND AIR CONDITIONING

Any additional equipment or equipment upgrade having a greater heat dissipation
requirement than the existing system will be the responsibility of the LESSEE
and if different than specified in the Application can not be installed without
the prior approval of the LESSOR, which approval shall not be unreasonably
withheld or delayed.


XX.  DOORS

Equipment building doors shall be kept closed at all times unless when actually
moving equipment in or out.


XXI. SITE APPEARANCE

1.   Services to maintain the appearance and integrity of the site will be
     provided by the LESSOR and will include scheduled cleaning of the shelter
     interiors.

2.   Each licensee/lessee is expected and required to remove from the site all
     trash, dirt and other materials brought into the shelter, or onto the site
     during their installation and maintenance efforts.
<PAGE>
 
3.   No food or drink is allowed within the equipment shelter.

4.   No smoking is allowed on the tower site.


XXII. STORAGE

No parts or material may be stored on site by LESSEE.


XXIII. DAMAGE

LESSEE shall report to LESSOR any damage to any item of the facility, structure,
component or equipment, whether or not caused by LESSEE.


XXIV. REPORTING ON SITE

1.   Personnel on site shall be required to communicate with the LESSOR by
     calling (412) 788-0906 and report their arrival on site, identity, purpose,
     expected and actual departure times.

2.   Emergency 24 hour contact number(s) must be displayed on outside of
     equipment cabinet/building.
<PAGE>
 
                                  EXHIBIT "D"

<PAGE>
 
                                                                   EXHIBIT 10.19
12/28/95
                         MASTER TOWER LEASE AGREEMENT

     This Agreement, made this 29th day of DECEMBER, 1995, between ROBERT A.
CROWN, d/b/a CROWN COMMUNICATIONS, with its principal mailing address of Penn
Center West III, Building #3, Suite 29, Pittsburgh, PA 15276, hereinafter
designated "CROWN" and Cellco Partnership, a Delaware General Partnership, d/b/a
Bell Atlantic NYNEX Mobile, Pittsburgh SMSA, L.P., and PA RSA 6 (II) referred to
hereinafter by name or individually and collectively as "BANM ", with its
principal offices at 180 Washington Valley Road, Bedminster, New Jersey 07921,
hereinafter designated "BANM".

WITNESSETH

     WHEREAS, Cellco Partnership, a Delaware General Partnership, d/b/a Bell
Atlantic NYNEX Mobile, Pittsburgh SMSA, L.P.,and PA RSA 6 (II) are related
entities, each of which operates in different areas to which this Master Tower
Lease Agreement may be applicable. They enter into this Master Tower Lease
Agreement in order to indicate their agreement to the terms and conditions
contained herein. It is the intention and understanding of CROWN and BANM that
individual Lease Supplements, as that term is defined hereinafter, shall be
entered into by only one of the following, Cellco Partnership, d/b/a Bell
Atlantic NYNEX Mobile, Pittsburgh SMSA, L.P.,and PA RSA 6 (II), as determined
solely by the BANM.

     WHEREAS, BANM desires to lease space on certain towers owned by CROWN; and

     WHEREAS, CROWN and BANM are desirous of establishing terms and conditions
which will apply to multiple sites which are to be leased by or presently being
leased by CROWN to BANM,

     In consideration of the mutual covenants contained herein, as well as the
mutual covenants contained in the companion "Master Tower Lease Agreement" in
which CROWN herein is the Lessee therein and BANM herein is Lessor therein,
which is being executed contemporaneously with this Agreement, and intending to
be legally bound hereby, the Parties hereto agree as follows:

     1.  CROWN hereby leases to BANM that certain space on one or more of
CROWN's towers, if space is available and the proposed installation is
structurally and frequency compatible, together with land for the installation
of BANM's equipment building(s) or equipment cabinet(s) or space within CROWN's
equipment building for the installation of BANM's equipment and together with a
non-exclusive right for ingress and egress, seven (7) days a week, twenty-four
(24) hours a day, on foot or motor vehicle, including trucks and for the
installation and maintenance of utility wires, poles, cables, conduits and pipes
over, under or along a right of way over CROWN's Property from the nearest
public right-of-way to the leased premises. Said space on CROWN's tower, parcel
of land for equipment building and right-of-way are collectively referred to
hereinafter as the "Property". The specific location, description and size of
the Property for each particular site will be described on one or more
supplements to this Agreement which CROWN and BANM shall prepare upon BANM's
decision to occupy a particular property and pursuant to which the specific
described Property will be leased by CROWN to BANM, for the purposes described
herein. The form of such supplement is attached hereto as Exhibit "A" to the
Master. Upon the communication by BANM to CROWN of the decision of BANM to lease
particular Property, CROWN shall within ten (10) days of such communication
provide BANM with the latitudes and longitudes of the Property and all other
information necessary to complete the supplement in each instance. The
supplement shall become effective upon its execution by both CROWN and BANM. The
terms and conditions of this Agreement shall apply to each said supplement,
whether executed simultaneously with this Agreement or subsequent to it.

                                       1
<PAGE>
 
  In the event any public utility is unable to use the right-of-way described in
the supplement, CROWN hereby agrees to grant, if available, an additional right-
of-way either to BANM or to the public utility at no cost to BANM.

  All future tenants of CROWN's tower will be obligated to comply with all
interference requirements as outlined in Paragraph 9 herein.

  Should BANM install its equipment in CROWN's equipment building, CROWN will be
responsible for supplying all emergency power to BANM or, at CROWN's discretion,
additional space within the building at no additional charge to allow BANM to
place its own generator. BANM will be responsible for supplying heating, air
conditioning, air conditioning distribution, cable trays, utilities, utility
meter or sub-meter.

  BANM and CROWN agree that BANM shall have the right to replace the equipment
described in the supplement with similar and comparable equipment.

  2.  The term of this Agreement shall be twenty-five (25) years after which
term, the terms and conditions shall survive and govern any remaining
supplements until their termination.

  3.  Each Property leased by CROWN to BANM pursuant to an applicable supplement
shall be leased with the commencement date as of the first (1st) day of the
month in which BANM is granted a building permit by the governmental agency
charged with issuing such permits for the Property unless otherwise indicated in
the supplement. In the event that a building permit is not required by the said
governmental agency, then the commencement date of each applicable supplement
shall be defined as the date of execution by both Parties of the applicable
supplement. The initial term for each supplement shall be for five (5) years and
shall be subject to extension as provided in this Agreement.

  4.  The term of each particular supplement shall automatically be extended for
four (4) additional five (5) year terms unless BANM terminates it at the end of
the then current term by giving CROWN written notice of the intent to terminate
at least six (6) months prior to the end of the then current term.
Notwithstanding the foregoing, if CROWN's rights in the Property are derived
from a prime lease with a third party and such prime lease has a shorter term or
extension terms than those provided for under this Paragraph, then BANM's right
to extend any particular supplement shall only be for as long as CROWN has the
right to extend its interest in the same applicable Property. BANM shall have
the right to terminate any supplement on the annual anniversary of said
supplement provided CROWN is given thirty (30) days written notice.
Notwithstanding the extension provisions contained herein, there shall be no
option to extend the term of any supplement following termination of this
Agreement.

  5.  The annual rental shall be paid in equal monthly installments on the first
(lst) day of each month, in advance, to CROWN or such other person, firm or
place as CROWN may, from time to time, designate in writing at least thirty (30)
days in advance of any rental payment date. The amount of the annual rental
shall be that amount as defined on Exhibit "D" attached hereto and made a part
hereof.

      The annual rental for the first (1st) five (5) year extension term and
each and every extension thereafter, shall be adjusted by a formula as follows:

[*]

[*] 

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

                                       2
<PAGE>
 

[*]


  The Parties agree that the properties presently leased to BANM by CROWN as
listed in Exhibit "B" to the Master attached hereto and made a part hereof,
shall be governed by the terms and conditions of this Agreement. Upon execution
of this Agreement, the amount of the annual rental payments, including any back
rent that has not yet been paid as of the execution date of this Master
Agreement, shall be that amount as calculated in accordance with, and as defined
on Exhibit "D" to the Master attached hereto and made a part hereof.

  6.  BANM shall use the Property for the purpose of constructing, maintaining
and operating a Communications Facility and uses incidental thereto together
with all necessary connecting appurtenances. CROWN shall provide a security
fence around the existing improvements at the Property. All improvements to the
Property resulting from BANM's use shall be at BANM's expense. BANM will
maintain the Property in a reasonable condition. It is understood and agreed
that BANM's ability to use the Property is contingent upon its obtaining after
the execution date of this Agreement all of the certificates, permits, F.C.C.
approvals for full power usage and other approvals that may be required by any
Federal, State or Local authorities which will permit BANM use of the Property
as set forth above. CROWN and BANM agree that CROWN, at CROWNS expense, shall
obtain the building permit in CROWN's name, for the initial BANM installation
that might be required for the Property. After the initial BANM installation,
BANM shall be responsible for obtaining at BANM's own expense, building permits
for any changes to the Property to be made by BANM. In the event CROWN
determines that no building permit is required, CROWN shall indemnify, defend
and hold BANM harmless against any claim of liability or loss, including
reasonable attorney's fees and costs, resulting from the failure to obtain a
building permit and BANM reserves the right to obtain a building permit on its
own, at BANM's expense. CROWN shall cooperate with BANM's use of the Property as
set forth above. CROWN shall cooperate with BANM in its effort to obtain such
approvals and shall take no action which would adversely affect the status of
the Property with respect to the proposed use thereof by BANM. In the event that
any of such applications should be finally rejected or any certificate, permit,
license or approval issued to BANM is canceled, expires, lapses, or is otherwise
withdrawn or terminated by governmental authority so BANM in its sole discretion
will be unable to use the Property for its intended purposes, BANM shall have
the right to terminate the supplement concerning the affected Property. Notice
of BANM's exercise of its right to terminate shall be given to CROWN in writing
by certified mail, return receipt requested, and shall be effective upon the
mailing of such notice by BANM. All rentals paid to said termination date shall
be retained by CROWN. Upon such termination, such supplement shall become null
and void and the Parties shall have no further obligations including the payment
of money, to each other.

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.


                                       3
<PAGE>
 
  7.  CROWN agrees BANM shall have free access to CROWN's tower at all times
for the purpose of installing and maintaining BANM's equipment and in
circumstances in which BANM's equipment is located within CROWN's tower
equipment building, CROWN further agrees to give BANM free ingress and egress to
CROWN's tower equipment building during the continuation of the supplement and
any renewals thereof. BANM, at BANM's sole expense, shall have the option of
structurally upgrading or replacing CROWN's communications facility to
accommodate BANM's tenancy of the Property, however, CROWN reserves the right to
approve any and all changes and shall retain ownership of the structure
including any and all structural modifications and support structures except for
BANM's antennas and cables, throughout the terms of any supplement and this
Agreement. In the event BANM chooses to upgrade or replace CROWN's
communications facility, CROWN will be guaranteed by BANM that CROWN will not
experience any down time in CROWN's operation and BANM will indemnify and
reimburse CROWN for any and all claims of liability or losses by CROWN or any
third party resulting from any such down time in CROWN's operation. CROWN shall
furnish BANM with necessary keys for the purpose of ingress and egress to the
said site and tower location. It is agreed, however, that only authorized
engineers, employees or properly authorized contractors of BANM or persons under
their direct supervision will be permitted to enter said Property.

  8.  It is further understood and agreed CROWN must approve of the installation
contractor or personnel chosen by BANM to install, maintain and operate the
equipment, said approval by CROWN shall be made within ten (10) business days of
BANM's submission of said installation contractor or personnel. Said
installation, maintenance and operation will in no way damage or interfere with
CROWN's use of the Tower, antennas and appurtenances. If damage or interference
is caused by BANM, and BANM fails to make such repairs within twenty four (24)
hours after notice by CROWN, CROWN may make the repairs and the reasonable costs
thereof shall be payable to CROWN by BANM on demand. If BANM does not make
payment to CROWN within thirty (30) days after such demand, CROWN shall have the
right to declare this Agreement in default and terminate the same without any
further notice or demand to BANM. CROWN's approval of the installation
contractor or personnel shall not be unreasonably withheld or delayed. CROWN
covenants that it will keep the Tower in good repair as required by federal law
H.R. 6180/S.2882, the Telecommunications Authorization Act of 1992 including
amendments to Sections 303(q) and 503(b) (5) of the Communications Act of 1934.
CROWN shall also comply with all rules and regulations enforced by the Federal
Communications Commission with regard to the lighting, marking and painting of
towers. If CROWN fails to make such repairs immediately after notice by BANM,
BANM may make the repairs and the reasonable costs thereof shall be payable to
BANM by CROWN on demand. If CROWN does not make payment to BANM within thirty
(30) days after such demand, BANM shall have the right to deduct the costs of
the repairs from the succeeding monthly rental amounts normally due from BANM to
CROWN.

  Notwithstanding anything to the contrary contained elsewhere in this
Agreement, with respect to work to be performed on or installations on the
Tower, CROWN shall have the right of first refusal to meet any bona fide bid
received by BANM to perform such work upon the same terms and conditions as set
forth in the bid, provided however that CROWN has an executed construction
agreement with BANM at the time of the bid offer. CROWN shall have seven (7)
days after the submission of such bid by BANM to notify BANM whether CROWN
intends to meet such bid and perform the work in accordance with the bid. In the
event CROWN does not notify BANM within such time, BANM may proceed to contract
with another party subject to CROWN's reasonable approval of such contractor.
Additionally, CROWN shall have the right to bid on such tower work without
awaiting the submission of a bona fide third party bid, utilizing its most
recent awarded competitive project rates, which bid BANM, at its option, may
accept or decline. At its option, BANM shall have the right to furnish any and
all materials with respect to tower work as long as they are in compliance with
the other terms of this Agreement.

  All work performed by CROWN on the Property shall be subject to inspection by
BANM in order to ensure compliance with the scope of work that is to be
provided. BANM shall comply with all specifications with

                                       4
<PAGE>
 
regard to construction, radio frequency and installation on CROWN's tower as
outlined in Exhibit "C" to the Master attached hereto and made a part hereof.

     No materials may be used in the installation of the antennas or
transmission lines that will cause corrosion or rust or deterioration of the
Tower structure or its appurtenances.

     Each antenna must be identified by color coding or a metal tag fastened
securely to its bracket on the Tower and each transmission line is to be tagged
at the conduit opening where it enters the equipment building.

     9. BANM agrees to have installed transmitting and receiving equipment of
the type and frequency which will not cause measurable interference as defined
by the F.C.C. to CROWN, other lessees of the Premises or neighboring landowners.
In the event BANM's equipment causes such interference BANM will take all steps
necessary to correct and eliminate the interference. CROWN agrees that any
future tenants of the premises who take possession after the date of execution
of the supplement will have installed transmitting and receiving equipment of
the type and frequency which will not cause measurable interference as defined
by the F.C.C. In the event any future tenant's equipment causes interference,
CROWN will see that said tenant take all steps necessary to correct and
eliminate the interference and said tenant ceases operation until said
interference is eliminated.

     10. BANM agrees to maintain the antennas, transmission lines and other
appurtenances, in proper operating condition and maintain same as to appearance
and safety.

     11. All installations and operation in connection with this Agreement by
BANM shall meet with all applicable rules and regulations of the Federal
Communications Commission ("F.C.C."), Federal Aviation Agency and all applicable
codes and regulations of the township, county and state concerned. Under this
Agreement, CROWN assumes no responsibility for the licensing, operation, and/or
maintenance of BANM's radio equipment.

     12. BANM shall indemnify and hold CROWN harmless against any claim of
liability or loss from personal injury or property damage resulting from or
arising out of its use and occupancy of the Property by BANM, its servants or
agents, excepting, however, such claims or damages as may be due to or caused by
the acts of CROWN, or its servants or agents.

     13. The Parties hereby waive any and all rights of action for negligence
against the other which may hereafter arise on account of damage to the Premises
or to property, resulting from any fire, or other casualty of the kind covered
by standard fire insurance policies with extended coverage, regardless of
whether or not, or in what amounts, such insurance is now or hereafter carried
by the Parties, or either of them. BANM shall maintain at its own expense during
the term of the Agreement or any supplement, general liability insurance with a
combined single limit of Five Million ($5,000,000.00) Dollars for bodily injury
and property damage. Coverage shall include Independent Contractors Liability.
At execution of this Agreement, BANM shall provide a Certificate of Insurance to
CROWN, evidencing CROWN as an additional insured and which shall contain a
provision for thirty (30) day notice of cancellation or material change to
CROWN. BANM shall also maintain Auto Liability insurance in an amount no less
than One Millions ($1,000,000.00) Dollars combined single limit for Bodily
Injury and/or Property Damage claims. BANM must also maintain statutory Workers
Compensation Insurance and Employee's Liability for One Million ($1,000,000.00)
Dollars.

     All insurers will be Best Rated AX or better.

     14. BANM shall pay as additional rent any increase in real estate taxes
levied against the leased Property which are directly attributable to the
improvements constructed or installed by BANM.

                                       5
<PAGE>
 
     15.  CROWN and BANM acknowledge that they will be entering into one other
"Master Tower Lease Agreement" in which CROWN herein is Lessee therein and BANM
herein is Lessor therein, which will be executed contemporaneously with this
Agreement. The Parties agree that any default or breach of any other such
Agreement shall be considered a default or breach of this Agreement. In the
event of a material default or breach of this Agreement, the other Party may, in
addition to any other remedies available at law or in equity, declare both
"Master Tower Lease Agreements" null and void. However, neither Party shall have
the right to declare a default or breach on the part of the other Party or to
terminate or declare null and void the Master Tower Lease Agreements until the
alleged defaulting Party has had an opportunity to cure as hereinafter set
forth. The non-defaulting Party shall provide to the other Party notice setting
forth the nature and extent of the default. In the event of a monetary default,
the default must be cured within ten (10) days after notice of the same. In the
event of a non-monetary default, the defaulting Party shall have thirty (30)
days to cure the same, or such extended period as may be required to cure such
default provided the defaulting Party commences the cure within the said thirty
(30) day period and thereafter continuously and diligently pursues the cure to
completion.

     16.  BANM, upon termination of the Agreement or the applicable supplement,
shall, within a reasonable period, remove its equipment, personal property and
all fixtures and restore the Property to its original condition, reasonable wear
and tear excepted. If such time for removal causes BANM to remain on the
Property after termination of this Agreement, BANM shall pay rent at the then
existing monthly rate or on the existing monthly pro-rata basis if based upon a
longer payment term, until such time as the removal of the equipment, personal
property and all fixtures, are completed.

     17.  Should CROWN decide sell any Property, CROWN shall notify BANM and
BANM shall have the right of first refusal to meet any bona fide offer of sale
on the same terms and conditions of such offer. If BANM fails to meet such bona
fide offer within forty five (45) days after notice thereof from CROWN, CROWN
may sell the Property or portion thereof to such third person in accordance with
the terms and conditions of his offer.

     18.  Should CROWN, at any time during the term of any supplement, decide to
sell all or any part of the Property to a purchaser other than BANM, such sale
shall be under and subject to this Agreement and any such applicable supplement
and BANM's rights hereunder, and any sale by CROWN of the portion of this
Property underlying the right-of-way herein granted shall be under and subject
to the right of BANM in and to such right-of-way.

     19.  CROWN covenants that BANM, on paying the rent and performing the
covenants shall peaceably and quietly have, hold and enjoy the leased Property.

     20.  CROWN covenants that CROWN is seized of good and sufficient interest
to the Property and has full authority to enter into and execute this Agreement.
CROWN further covenants that there are no other liens, judgments or impediments
affecting its interest in the Property. CROWN further covenants that there are
no easements, rights-of-ways or restrictions which encroach upon the Property
which is leased under this Agreement and which interfere with BANM's use of the
Property as contemplated under this Agreement.

     21.  It is agreed and understood that this Agreement and all supplements to
it contain all the agreements, promises and understandings between CROWN and
BANM and that no verbal or oral agreements, promises or understandings shall be
binding upon either CROWN or BANM in any dispute, controversy or proceeding at
law, and any addition, variation or modification to this Agreement shall be void
and ineffective unless made in writing signed by the Parties.

     22.  This Agreement and the performance thereof shall be governed,
interpreted, construed and regulated by the laws of the state of the location of
the Property indicated in the supplement.

                                       6
<PAGE>
 
     23. This Agreement may be sold, assigned or transferred by BANM without any
prior approval or consent of CROWN, only to BANM's principal, affiliates,
subsidiaries of its principal or to any entity which acquires all or
substantially all of BANM's assets in the markets covered by the following
F.C.C. Licenses: Pittsburgh, Pennsylvania MSA; Pennsylvania 2 - McKean;
Pennsylvania 6.2 - Butler; Pennsylvania 7 - Jefferson; Pennsylvania 9 - Greene;
Pennsylvania 11.2 - Huntington; West Virginia 1 - Mason; West Virginia 2 -
Wetzel; and any new Pittsburgh supersystem Property acquired by BANM after the
date of this Agreement by reason of a merger, acquisition or other business
reorganization. However, such sale, assignment, or transfer by BANM shall not
alter or affect any prior pre-existing agreement between CROWN and the assignee
or transferee. As to other Parties, this Agreement may not be sold, assigned or
transferred without the written consent of CROWN which such consent will not be
unreasonably withheld. Further, the Property may not be sublet by BANM for any
purpose without the written consent of CROWN, which consent may also be withheld
in CROWN's absolute discretion.

     24. All notices hereunder must be in writing and shall be deemed validly
given if sent by certified mail, return receipt requested, addressed as follows
(or any other address that the Party to be notified may have designated to the
sender by like notice):

  As to CROWN:  Robert Crown
                Crown Communications                
                Penn Center West III
                Building #3, Suite 229                
                Pittsburgh, PA 15276

  As to BANM:   Bell Atlantic NYNEX Mobile                
                180 Washington Valley Road
                Bedminster, New Jersey 07921
                Attention:  Staff Director - Real Estate

     25. This Agreement shall extend to and bind the heirs, personal
representatives, successors and assigns of the Parties hereto. The Parties
further agree that all of the provisions in this Agreement shall affect and bind
any and all tenants or occupants of the Property who come upon the same through
or by agreement with either Party. Each Party shall be fully responsible to
ensure that any and all tenants or occupants of the Property who come upon the
same through or by agreement with that Party comply with all of the terms and
provisions of this Agreement and such Party shall be fully liable and
responsible for any breaches of this Agreement by its tenants or occupants.

     26. The Parties acknowledge that CROWN's rights in the Property may be
derived from a separate agreement with a third party hereinafter referred to as
a "Prime Lease Agreement" in which CROWN herein is lessee, grantee or licensee
therein. If this is the case, the parties to such Prime Lease Agreement and the
date of such Prime Lease Agreement shall be designated in the particular
supplement, and a copy of said Prime Lease shall be attached as Exhibit "B" to
the Supplement, and the following provisions shall be applicable. In the event
approval of the prime lessor, grantor or licensor is required in the Prime Lease
Agreement, the effectiveness of any supplement concerning such property shall be
specifically subject to the obtaining of such approval. Further, all the terms,
conditions and covenants contained in this Agreement and any supplement shall be
specifically subject to and subordinate to the terms and conditions of any Prime
Lease Agreement affecting the Property which is the subject of the particular
supplement. In the event any of the provisions of the Prime Lease Agreement
supersede or contradict the terms of this Agreement, such terms of this
Agreement shall be deemed deleted or superseded to the extent of the
contradiction as applicable to the space utilized by BANM. Further, BANM agrees
to be bound by and agrees to perform all the acts and responsibilities required
of the lessee pursuant to the Prime Lease Agreement. Lastly, in the event the
Prime Lease Agreement terminates for any reason or if any previously approved
zoning or governmental permit affecting the use of the Property as a

                                       7
<PAGE>
 
communications facility terminates or is withdrawn, the supplement relating to
the Property covered by said Prime Lease Agreement, permit or approval shall be
deemed to have terminated effective the date of the termination of the Prime
Lease Agreement, permit or approval.

     27. For properties owned by CROWN, any mortgage affecting the Property
shall recognize the validity of this Agreement and the supplement affecting the
Property in the event of a foreclosure of CROWN's interest and also BANM's right
to remain in occupancy of and have access to the Property as long as BANM is not
in default of this Agreement and the applicable supplement. BANM shall execute
whatever instruments may reasonably be required to evidence this subordination
clause. In the event the owned Property covered by a particular supplement is
encumbered by a mortgage, CROWN immediately after executing that supplement,
will obtain and furnish to BANM, a Non-disturbance Agreement for each such
mortgage in recordable form. On properties leased by CROWN from a prime
landlord, CROWN shall make its best efforts to obtain from the prime landlord
and furnish to BANM a non-disturbance for each such mortgage in recordable form.

     28. For properties owned by CROWN, CROWN agrees to execute a Memorandum of
Lease with respect to each supplement executed between the Parties which BANM
may record with the appropriate Recording Officer. The date set forth in each
such Memorandum of Lease is for recording purposes only and bears no reference
to commencement of either term or rent payments.

     29. This Agreement revokes and supersedes any other agreements between the
Parties, whether or not in writing, that pertain to the subject matter described
herein.

     30. The Parties agree that without the express written consent of the other
Party, neither Party shall reveal, disclose or promulgate to any third party the
specific financial terms contained in this Agreement or any exhibit or
supplement to it, except to such third party's auditor, accountant or attorney
or to a governmental agency if required by regulation, subpoena or government
order to do so.

     IN WITNESS WHEREOF, the Parties hereto have set their hands and affixed
their respective seals the day and year first above written.

                                        ROBERT A. CROWN,
                                        d/b/a CROWN COMMUNICATIONS

 /s/ Herbert R. Krugermann         BY:  /s/ Robert A. Crown
- --------------------------              -----------------------------  
WITNESS                                 Robert A. Crown
           
                                        CELLCO PARTNERSHIP
                                        by Bell Atlantic NYNEX Mobile, Inc.
                                        its managing general partner

 /s/ Toni Taylor-Hikes             BY:  /s/ Richard J. Lynch
- --------------------------              -----------------------------
WITNESS                                 Richard J. Lynch 
                                        Executive Vice President and 
                                        Chief Technical Officer        


                     BANM SIGNATURE CONTINUED ON NEXT PAGE

                                       8
<PAGE>
 
                                        Pittsburgh SMSA, L.P.
                                        by Cellco Partnership, its managing 
                                        general partner,
                                        by Bell Atlantic NYNEX Mobile, Inc., 
                                        its managing general partner
     
 /s/ Toni Taylor-Hikes             BY:  /s/ Richard J. Lynch
- --------------------------              -----------------------------  
WITNESS                                 Richard J. Lynch 
                                        Executive Vice President and 
                                        Chief Technical Officer         

                                        Pennsylvania RSA No. 6 (II), L.P.
                                        by Cellco Partnership, its managing 
                                        general partner,
                                        by Bell Atlantic NYNEX Mobile, Inc., 
                                        its managing general partner

 /s/ Toni Taylor-Hikes             BY:  /s/ Richard J. Lynch
- --------------------------              -----------------------------  
WITNESS                                 Richard J. Lynch 
                                        Executive Vice President and 
                                        Chief Technical Officer         

                                       9
<PAGE>
 
                           EXHIBIT "A" to the Master
                                    1 of 2

                         MASTER TOWER LEASE SUPPLEMENT 

  This Master Tower Lease Supplement ("Lease Supplement")
is made and entered into as of this __________ day of __________, 199__, by and 
between Robert A. Crown, d/b/a CROWN COMMUNICATIONS hereinafter designated as
"CROWN" and ____________ d/b/a Bell Atlantic NYNEX MOBILE, hereinafter
designated as "BANM", pursuant and subject to that certain Master Tower Lease
Agreement (the "Master Agreement") by and between the Parties hereto, dated as
of December ___________, 1995. All capitalized terms have the meanings ascribed
to them in the Master Agreement.

   1. The Parcel shall consist of that certain parcel of property, located in 
the City of _____________, the County of __________________________, and the 
State of _____________, more particularly described as a ___' by ______' parcel
containing approximately ______________  square feet situated at _______________
__________________________ (add legal description), together with the non-
exclusive right for ingress and egress, seven (7) days a week twenty-four (24)
hours a day, on foot or motor vehicle, including trucks, and for the 
installation and maintenance of utility wires, poles, cables, conduits, and 
pipes over, under, or along a (   ') foot wide right-of-way extending from the
nearest public right-of-way,                                          to the
demised premises, said premises and right-of-way for access being substantially
as described herein in Exhibit "A" to the Supplement attached hereto and made a
part hereof.

  2.  BANM's Antenna(s) shall consist of _________ antennas, each described in
terms of type, size, frequency, effective radiated power, and height on the
Tower outlined as follows:

  Manufacturer and type-number:                   ________
                                                  ________
                                                  ________
  Number of antennas:                             ________
  Weight and dimension of antenna(s) (LxWxD):     ________
  Transmission line mfr. & type no.:              ________
  Diameter & length/transmission line:            ________
  Height of antenna(s) on tower:                  ________
  Direction of radiation:                         ________
  Equipment building/floor space dimensions:      ________

  3.  The first (lst) annual rental payment due and payable by BANM to CROWN is
$________ per year, payable in accordance with the Master Agreement. Any future
rent adjustments shall be calculated in accordance with Exhibit "D" to the
Master Agreement.

  4.  The Commencement Date of this Supplement shall be as outlined in Paragraph
3 of the Master Agreement except if another commencement date applies, in which
event it is specified as ____________, 19 .

  5. The Parties acknowledge that CROWN's rights in the property derive from a
certain Lease Agreement dated ____________________ between CROWN herein and
____________________ hereinafter referred to as the 'Prime Lease' and attached
hereto as Exhibit "B" to the Supplement. CROWN shall not terminate the Prime
Lease prior to the expiration of its term or any subsequent extension terms
without the express written consent of BANM. In the event CROWN receives any
written notice of failure to pay or failure to perform any covenant, agreement
or obligation under the Prime Lease, CROWN shall notify BANM of such notice as
soon

                                       10
<PAGE>
 
                           EXHIBIT "A" to the Master
                                    2 of 2

                        MASTER TOWER LEASE SUPPLEMENT 

As the notice is received by CROWN pursuant to the terms of the Prime Lease and
BANM may take any such actions to cure any such failure if CROWN fails to cure
the same within sixty (60) days. BANM shall be under no obligation to take such
action
but may do so solely at its own discretion. In the event BANM pays any amount or
performs any obligations on behalf of CROWN pursuant to the terms of the Prime
Lease. BANM may deduct such amounts paid or the reasonable value of the
performance from the amount that would otherwise be due from BANM to CROWN
pursuant to this Agreement.

     IN WITNESS WHEREOF, the Parties hereto have set their hands and affixed
their respective seals the day and year first above written.

                                   ROBERT A. CROWN, d/b/a   
                                   CROWN COMMUNICATIONS

_________________________          BY:_______________________________ 
WITNESS                            Robert A. Crown            

                                   __________________________________ 
                                   by Bell Atlantic NYNEX Mobile, Inc.
                                   its managing general partner

_________________________          BY:_______________________________ 
WITNESS                              Richard J. Lynch
                                     Executive Vice President and 
                                     Chief Technical Officer

                                       11
<PAGE>
 
                         EXHIBIT "A" to the Supplement

                             Property Description

                                       12
<PAGE>
 
                           EXHIBIT "B" to Supplement

                             PRIME LEASE AGREEMENT

                                       13
<PAGE>
 
                           EXHIBIT "B" to the Master

                  CURRENT PROPERTIES LEASED BY CROWN TO BANM


                BUT A          Cranberry, PA  
                BUT B          Kittanning, PA      
                PIT ABB        Washington, Canton Township, PA
                PIT DDG        Crane Avenue, Pittsburgh, PA      
                PIT EEY        Glassport, PA                     
                PIT FD         Oakdale, PA                       
                PIT FK         Coraopolis, PA (Airport)          
                PIT HEH        Monroeville, PA                   
                PIT WWXX-2     Greensburg, PA                    
                PIT DI94C      Carnegie, PA                      
                PIT F94C       Clinton, PA                        

                                       14
<PAGE>
 
                           EXHIBIT "C" to the Master

Revision: 4/6/95

                                SITE STANDARDS
                                --------------

1.   GENERAL
     -------
A.   PURPOSE
     -------
     The purpose of these Site Standards is to create a quality site 
     installation. These standards are to be in effect for each site at which 
     BANM has equipment in, on or at the site and at which BANM has a right to 
     occupy pursuant to the lease to which this document is an attachment.

B.   STATE AND NATIONAL STANDARDS
     ----------------------------
     1.   All installations must conform with all state and national regulations
          and the following state and national codes or any supplements, 
          amendments or provisions which supersede them:
     a.   American National Standards Institute:
          ANSI/EAI-222E Structural Standards for Steel Antenna Towers and 
          Antenna Supporting Structures
     b.   Federal Aviation Administration Regulations:
          Vol. XI, Part 77 Objects Affecting Navigable Airspace           
          Advisory Circular Obstruction Marking and Lighting
          AC 70/7460
          Advisory Circular High Intensity Obstruction Lighting Systems
          AC 150/5345-43, FAA/DOD Specifications L-856
     C.   Federal Communications Commission Rules and Regulations:           
          Code of Federal Construction, Marking and Lighting of Antenna
          Regulations Title 47 Structures
          Chapter 1, Part 17
     d.   National Electrical Code
     e.   Building Officials and Code Administrators International, Inc.
          Basic National Building Code
          Basic National Mechanical Code
          State Building Code
     f.   National Fire Protection Association
               Code 101 - Life Safety
               Code 90A - Air Conditioning and Ventilating Systems 
               Code 110 - Emergency and Standby Power Systems
     g.   State Fire Safety Code
     h.   Occupational Safety and Health Administration
               Safety and Health Standards (29 CFR 1910) General Industry 
               Subpart R Special Industries
               1910.268Telecommunications 
               1926.510Subpart M Fall Prevention
     i.   Motorola Grounding Guideline for Cellular Radio Installations, 
          Document No. 68P81150E62, 7/23/92 OR AT&T AUTOPLEX Cellular 
          Telecommunications Systems, Lightning Protection and Grounding, 
          Customer Information Bulletin 148B, August 1990, or latest revision.

C.   GENERAL/APPROVAL
     ----------------
     1.   All users shall furnish the following to CROWN prior to installation 
          of any equipment:
          a.   Completed Application. (BANM must make new Application to CROWN 
               for change in Antenna position or type.)
          b.   Fully executed supplement
          c.   Copies of FCC licenses and construction/building permits.
          d.   Final site plan outlining property boundaries, improvements, 
               easements and access.
          e.   Accurate block diagrams showing operating frequencies, all system
               components (active or passive) with gains and losses in dB, along
               with power levels.

     2.   The following will not be permitted at the facility without the prior
          written consent of CROWN.
          a.   Any equipment without FCC type acceptance or equipment which 
               does not conform to FCC rules and regulations.

                                       15
<PAGE>
 
               b.   Add-on power amplifiers.                                  
               c.   "Hybrid" equipment with different manufacturers' RF strips.
               d.   Open rack mounted receivers and transmitters.             
               e.   Equipment with crystal oscillator modules which have not
                    been temperature compensated.
               f.   Digital/analog hybriding in exciters, unless type-accepted.
               g.   Non-continuous duty rated transmitters used in continuous
                    duty applications.
               h.   Transmitter outputs without a harmonic filter and antenna
                    matching circuitry.
               i.   Change in operating frequency(ies).                       
               j.   Ferrite devices looking directly at an antenna.
               k.   Nickel plated connectors.
               1.   Cascaded receiver multicouplers/preamps. 

3.        All emergencies are to be reported immediately to 412-788-0906.

D.        LIABILITY
          ---------
          It shall be the responsibility of the BANM to comply with all of the
          site standards set forth herein. The BANM specifically agrees to
          indemnify and hold harmless the CROWN against any claim of liability,
          loss, damage or costs including reasonable attorney's fees, arising
          out of or resulting from the BANM's non-compliance with the standards
          set forth herein.

E.        INSPECTION
          ----------
          CROWN reserves the right to inspect BANM's area without prior notice
          at any time during the term of the Lease Agreement in order to ensure
          compliance with the standards set forth herein. Any such inspection
          shall be solely for the benefit and use of the CROWN and does not
          constitute any approval of or acquiescence to the conditions that
          might be revealed during the course of the inspection.

          CROWN reserves the right to inspect CROWN's area without prior notice.

F.        DISCLAIMER OF RESPONSIBILITY
          ----------------------------
          It is the intention of the CROWN and BANM that the standards set forth
          herein are part of the Agreement between them. It is specifically
          agreed that they are not intended to be relied upon or to benefit any
          third party. Further, the CROWN shall have no liability or
          responsibility to any third party as a result of the establishment of
          the standards set forth herein, any inspection by the CROWN of the
          BANM's area in order to determine compliance with the standards, the
          sufficiency or lack of sufficiency of the standards, or the BANM's
          compliance or non-compliance with the standards and the BANM agrees to
          indemnify and hold harmless the CROWN against any claim by a third
          party resulting from such theories.

II.       RADIO FREQUENCY INTERFERENCE PROTECTIVE DEVICES
          -----------------------------------------------
          A.   If due to BANM's use or proposed use, there exists any change to
               the RF environment it will be at CROWN's sole discretion to
               require any or all of the following:
               1.   IM protection panels can be installed in lieu of separate
                    cavity and isolator configurations. CROWN approval required.
               2.   30-76 MHz
                    - Isolators required
                    - TX output cavity - minimum of 20 dB rejection @ plus or
                    minus 5 MHz
               3.   130-174 MHz
                    - Isolators - minimum of 30 dB with bandpass cavity
               4.   406-512 MHz
                    - Isolators - minimum of 60 dB with bandpass cavity
               5.   806-866 MHz
                    - Isolators - minimum of 60 dB with bandpass cavity
               6.   866 MHz and above - as determined by CROWN.

          B.   Additional protective devices may be required based upon CROWN's
               evaluation of the following information:
               1.   Theoretical Transmitter (TX) mixes.
               2.   Antenna location and type
               3.   Combiner/multicoupler configurations
               4.   Transmitter specifications

                                       16
<PAGE>
 
                5.   Receiver specifications                                  
                6.   Historical problems                                      
                7.   Transmitter to transmitter isolation                     
                8.   Transmitter to antenna isolation                         
                9.   Transmitter to receiver isolation                        
               10.   Calculated and measured level of Intermodulative (IM)    
                     products                                                 
               11.   Transmitter output power                                 
               12.   Transmitter Effective Radiated Power (ERP)               
               13.   Spectrum analyzer measurements                           
               14.   Voltage Standing Wave Radio (VSWR) measurements          
               15.   Existing cavity selectivity                              

          C.   BANM will be required to immediately correct excessive cabinet
               leakage which causes interference to other tenants.

III.      ANTENNAS AND ANTENNA MOUNTS
          ---------------------------
          A.   All mounting hardware to be utilized by BANM to be as specified
               by tower manufacturer and approved by CROWN.
          B.   Connections to be taped with stretch vinyl tape (Scotch #33-T or
               equivalent) and Scotchkoted or equivalent (including booted
               pigtails).
          C.   Must meet manufacturer's VSWR specifications.
          D.   Any corroded elements must be repaired or replaced.
          E.   Must be DC grounded type, or have the appropriate lightning
               protection as determined by CROWN.
          F.   No welding or drilling on mounts will be permitted.
          G.   All antennas must be encased in fiberglass radomes and be painted
               or impregnated with a color designated by CROWN as the standard
               antenna color for aesthetic uniformity.

IV.       CABLE
          -----
          A.   All antenna lines to be approved by CROWN.
          B.   All transmission line(s) will be installed and maintained to
               avoid kinking and/or cracking.
          C.   Tagged with weatherproof labels showing manufacturer, model, and
               owner's name at both ends of cable run.
          D.   Any cable fasteners exposed to weather must be stainless steel.
          E.   All interconnecting cables/jumpers must have shielded outer
               conductor and approved by CROWN.
          F.   Internally, all cable must be run in troughs or on cable trays
               and on cable or waveguide bridges at intervals of no less than
               3'. Externally, all cable must be attached with stainless steel
               hangers and non-corrosive hardware.
          G.   All unused lines must be tagged at both ends showing termination
               points with the appropriate impedance termination at each end.
          H.   All AC line cords must be 3 conductor with grounding plugs.
          I.   All antenna transmission lines shall be grounded at both the
               antenna and equipment ends at the equipment ends and at building
               entry point, with the appropriate grounding kits.
          J.   All cables running to and from the exterior of the cabinet must
               be 100% ground shielded. Preferred cables are: Heliax, Superflex
               or, braided grounds with foil wrap.

V.        CONNECTORS
          ----------
          A.   Must be Teflon filled, UHF or N type, including chassis/bulkhead
               connectors.
          B.   Must be properly fabricated (soldered if applicable) if field
               installed.
          C.   Must be taped and Scotchkoted or equivalent at least 4" onto
               jacket if exposed to weather.
          D.   Male pins must be of proper length according to manufacturer's
               specifications.
          E.   Female contacts may not be spread.
          F.   Connectors must be pliers tight as opposed to hand tight.
          G.   Must be silver plated or brass.
          H.   Must be electrically and mechanically equivalent to Original
               Equipment Manufacturers (OEM) connectors.

VI.       RECEIVERS
          ---------
          A.   No RF preamps permitted in front end unless authorized by CROWN.
          B.   All RF shielding must be in place.
          C.   VHF frequencies and higher must use helical resonator front ends.

                                       17
<PAGE>
 
          D.   Must meet manufacturer's specifications, particularly with regard
               to bandwidth, discriminator, swing and symmetry, and spurious
               responses.
          E.   Crystal filters/pre-selectors/cavities must be installed in RX
               legs where appropriate.
          F.   All repeater tone squelch circuitry must use "AND" logic.

VII.      TRANSMITTERS
          ------------
          A.   Must meet original manufacturer's specifications.
          B.   All RF shielding must be in place.
          C.   Must have a visual indicator of transmitter operation.
          D.   Must be tagged with BANM's name, equipment model number, serial
               number, and operating frequency(ies).
          E.   All low-level, pre-driver and driver stages in exciter must be
               shielded.
          F.   All power amplifiers must be shielded.
          G.   Output power may not exceed that specified on BANM's FCC License.

VIII.     COMBINERS/MULTICOUPLERS
          -----------------------
          A.   Shall at all times meet manufacturer's specifications.
          B.   Must be tuned using manufacturer approval procedures.
          C.   Must provide a minimum of 60 dB transmitter to transmitter
               isolation.

IX.       CABINETS
          --------
          A.   All cabinets must be bonded together and to the equipment
               building ground system.
          B.   All doors must be secured.
          C.   All non-original holes larger than 1" must be covered with copper
               screen or solid metal plates.
          D.   Current license for all operating frequencies should be mounted
               on the cabinet exterior for display at all times.

X.        INSTALLATION PROCEDURES
          -----------------------
          A.   Any tower work must be scheduled with CROWN using only CROWN
               approved contractors at least 48 hours in advance of site work.
               BANM will be responsible for any and all fees associated with
               said work.
          B.   Installation may take place only after CROWN has been notified of
               the date and time in writing, and only during normal working
               hours unless otherwise authorized beforehand.
          C.   Equipment may not be operated until final inspection of
               installation by CROWN, which shall not be unreasonably withheld.
          D.   Any testing periods are to be approved in advance by CROWN and
               within the parameters as defined by CROWN.

XI.       MAINTENANCE/TUNING PROCEDURES
          -----------------------------
          A.   All external indicator lamps/LED's must be working.
          B.   Equipment parameters must meet manufacturer's specifications.
          C.   All cover, shield, and rack fasteners must be in place and
               securely tightened.
          D.   Local speakers and/or orderwire systems must be turned off except
               during service, testing or other maintenance operations.

XII.      INTERFERENCE DIAGNOSTIC PROCEDURES
          ----------------------------------
          The BANM must cooperate immediately with CROWN when called upon to
          investigate a source of interference, whether or not it can be
          conclusively proven that BANM's equipment is involved.

XIII.     TOWER
          -----
          This section deals with items which are to be mounted on, attached to
          or affixed to the Tower.

A.        ICE SHIELDS
          -----------     
          At CROWN's sole discretion, protective ice shields may be required
          and manufacturer of ice shield will be determined by CROWN.

B.        CLIMBING BOLTS AND LADDERS
          --------------------------
          All attachments made to the Tower shall be made in such a manner as
          not to cause any safety hazard to other users or cause any restriction
          of movement on, or to any climbing ladders, leg step bolts or safety
          cables provided.

C.        BRIDGE
          ------

                                       18
<PAGE>
 
          1.   Installation of a cable bridge shall be at CROWN's sole
               discretion and with CROWN's approval.
          2.   If required, and in accordance with the manufacturers
               recommendations for the spacing of supports on horizontal runs
               for the particular type of cable or waveguide, the cable or
               waveguide shall be secured to the brackets on the bridge using
               clamps and hardware specifically manufactured for that purpose.
          3.   No cable or waveguide run shall be clamped, tied or in any way
               affixed to a run belonging to CROWN or any another
               licensee/lessee.

D.        CABLE LADDER AND WAVEGUIDE
          --------------------------
          1.   BANM shall install a ladder for the vertical routing of cable and
               waveguide. From the horizontal to vertical transition at the
               point where the bridge meets the tower to the point at which the
               cable or waveguide must leave the bridge to route to the antenna,
               all cable and waveguide is to be attached to the ladder in
               accordance with the recommendations of the manufacturer of the
               cable or waveguide.
          2.   No cable or waveguide run shall be clamped, tied or any way
               affixed to a run belonging to CROWN or any another
               licensee/lessee.

E.        DISTRIBUTION RUNS
          -----------------
          1.   Cable or waveguide runs from the cable ladder to the point at
               which they connect to the antenna shall be routed along tower
               members in a manner producing a neat and professional site
               appearance.
          2.   Cable and/or waveguide runs shall be specifically routed so as
               not to impede the safe use of the tower leg or climbing bolts, or
               to restrict the access of CROWN or any another licensee/lessee.
          3.   Distribution runs shall be clamped to the tower in accordance
               with the recommendations of the manufacturer of the cable or
               waveguide. 
          4.   No cable or waveguide run shall be clamped, tied or in any way
               affixed to a run belonging to CROWN or any another
               licensee/lessee.

F.        LENGTHS
          -------
          1.   Cable and/or waveguide runs shall not be longer than necessary to
               provide a proper connection and normal maintenance and operation.
          2.   No coiled lengths shall be permitted on the tower, bridge or on
               the ground.  

G.        ENTRY   
          -----
          1.   Entry of the cable or waveguide to the interior of the shelter
               shall be via ports provided in the shelter wall.
          2.   Cable and/or waveguide entering a port shall be provided with a
               boot to seal the port; the boot shall be a Microflect or
               equivalent commercial product made specifically for the type of
               cable or waveguide and for diameter of the entry port, and
               approved by CROWN before installation. It shall be installed in
               accordance with the instructions of the manufacturer and the port
               shall be sealed against the intrusion of moisture.

XIV.      EQUIPMENT LOCATED WITHIN CROWN'S EQUIPMENT BUILDING
          ---------------------------------------------------
A.        EQUIPMENT INSTALLATION REQUIREMENTS
          1.   Any mounting to walls either outside or inside CROWN's building
               must be pre-approved by CROWN.
          2.   All racks and equipment are to be plumb and true with the walls
               and floor of the shelter and reflect an installation consistent
               with the electrical and operational requirements of the equipment
               and appearance standards of a professional installation.
          3.   Racks are to be bolted to the floor and aligned on the center
               line as in the site drawing provided to the CROWN.
          4.   Racks are not to be attached to the cable trays.

B.        TRANSMISSION LINES AND/OR WAVEGUIDE ROUTING
          -------------------------------------------
          1.   Cable trays and/or troughs are required within the shelter for
               the routing of cable and waveguide to the equipment racks and
               termination points.
          2.   All cable and waveguide shall be placed and secured to the cable
               tray.

C.        LENGTHS
          -------
          1.   Cable and/or waveguide runs in the equipment shelter shall not be
               longer than necessary in order to provide a proper connection.
          2.   While adequate slack for purposes of maintenance and operation is
               permitted, no coiled lengths on the tray or elsewhere in the
               shelter are permitted for normal maintenance and operation.

                                       19
<PAGE>
 
xv.       GROUNDING
          ---------
          1.   The BANM must adhere to either the Motorola or AT&T grounding
               specification outlined above based on CROWN's equipment at
               facility.
          2.   All exterior grounding shall be C.A.D. welding.
          3.   All antennas shall be bonded to the tower.
          4.   Cable and waveguide shall be grounded as a minimum at three
               specific points, and for vertical runs in excess of 200 feet at
               intermediate points.
          5.   All cable and waveguide shall be grounded to the tower at the
               point where the run effectively breaks from the tower for its
               connection to the antenna, using clamps and hardware specifically
               manufactured for that purpose.
          6.   On the vertical portion of the cable or waveguide run, just above
               where it starts to make its transition from a vertical tower to a
               horizontal bridge run, all cable and waveguide shall be grounded
               to the tower using clamps and hardware specifically manufactured
               for that purpose.
          7.   On the exterior of each shelter, at a point near the entry ports,
               a grounding plate must be provided for terminating ground leads
               brought from the cable and waveguide. Each cable and waveguide
               run shall be grounded at this point using clamps and hardware
               specifically manufactured for that purpose.
          8.   On cable and waveguide installations where the vertical tower
               length exceeds 200 feet, the run shall be grounded at equally
               spaced intermediate points along the length of the run so as not
               to have a distance between grounding points longer than 100 feet.
          9.   Cable and waveguide grounding leads shall connect to a separate
               point for each run to the common ground point.
          10.  Grounding straps shall be kept to a minimum length and as near as
               possible to vertical down lead and shall be consistent with the
               restraints of protective dress and access.
          11.  Grounding plates must be provided for single point access to the
               site grounding system. Each rack shall have a properly sized,
               insulated ground lead from the rack safety and signal grounds to
               one of the grounding points on the ground plate.
          12.  The insulated ground lead shall follow the route of and be placed
               in the cable tray.
          13.  Each rack shall be separately grounded.
          14.  All modifications to grounding system must meet CROWN 's
               impedance specification.

XVI.      ELECTRICAL
          ----------
          1.   Power requirements must be approved, in advance by CROWN.
          2.   Polarized electrical outlets should be installed for all
               transmitters when possible.
          3.   Surge protection is required for all base stations.

XVII.     ELECTRICAL DISTRIBUTION
          -----------------------
          1.   All electrical wiring from the distribution breaker panel shall
               be via rigid metal conduit, thin wall, routed along the under
               side of the cable tray to a point directly above the equipment
               rack. From this point, BANM may select how to distribute to its
               equipment or rack.

XVIII.    TEMPORARY LOADS
          ---------------
          1.   Test equipment, soldering irons or other equipment serving a test
               or repair function may be used only if the total load connected
               to any single dual receptacle does not exceed 15 amps.
          2.   Test equipment to be in place for more than seven (7) days will
               require prior approval of the CROWN.

XIX.      HEATING, VENTILATING, AND AIR CONDITIONING
          ------------------------------------------
          1.   Any additional equipment or equipment upgrade having a greater
               heat dissipation requirement than the existing system will be the
               responsibility of the BANM and if different than specified in the
               Application cannot be installed without the prior approval of the
               CROWN.

XX.       DOORS
          -----
          1.   Equipment building doors shall be kept closed at all times unless
               when actually moving equipment in or out.

XXI.      SITE APPEARANCE
          ---------------
          1.   Services to maintain the appearance and integrity of the site
               will be provided by the CROWN and will include scheduled cleaning
               of the shelter interiors.
          2.   Each licensee/lessee is expected and required to remove from the
               site all trash, dirt and other materials brought into the
               shelter, or onto the site during their installation and
               maintenance efforts.
          3.   No food or drink is allowed within the equipment shelter.

                                       20
<PAGE>
 
          4.   No smoking is allowed on the Tower site.

XXII.     STORAGE
          -------
          No parts or material may be stored on site by BANM.

XXIII.    DAMAGE
          ------
          BANM shall report to CROWN any damage to any item of the facility,
          structure, component or equipment, whether or not caused by BANM.

XXIV.     REPORTING ON SITE
          -----------------
          1.   Personnel on site shall be required to communicate with the
               Network Operating Center by calling 412-788-0906 and report their
               arrival on site, identity, purpose, expected and actual departure
               times.
          2.   Emergency 24 hour contact number(s) must be displayed on outside
               of equipment cabinet/building.

                                       21
<PAGE>
 
                          MASTER LEASE PRICING MATRIX


A.        Antennas
          --------
          [*] (Tower mounted with one (1) associated coaxial cable per antenna).

          [*] (To be mounted 50' or lower on tower or along ice bridge.)

          Plastic satellite receive dish (4' diameter or less).
          Mounted @ 50'or lower: [*]
          Mounted @ 50'or above: Rate schedule below applies. May be permanently
          mounted on BANM's equipment shelter roof at no charge.

B.        Microwave/Satellite Dish/1/
          ------------------------

<TABLE> 
<CAPTION> 
Size                  Monthly Rental    Annual Rental 
- ----                  --------------    ------------- 
<S>                   <C>               <C> 
2' (incl. .75 meter)    [*]                [*] 
4'                      [*]                [*]
6'                      [*]                [*]
8'                      [*]                [*]
10'                     [*]                [*]
Ground Mounted          [*]                [*]
</TABLE> 

C.        Buildings/Equipment Shelters
          ----------------------------

<TABLE> 
<CAPTION> 
Size                  Monthly Rental    Annual Rental 
- ----                  --------------    ------------- 
<S>                   <C>               <C> 
Up to 360 sq. ft.      [*]                 [*]
361 to 420 sq. ft.     [*]                 [*]
421 to 560 sq. ft.     [*]                 [*]
</TABLE> 


CROWN must approve placement on site plan before installation by BANM.

D.        Internal Building,/Shelter Space
          --------------------------------
[*] CROWN has the sole right to determine if space is available.

E.        Utilities
          ---------
In all cases except temporary installations in generator rooms, electrical
service is the responsibility of BANM. When temporary installation is permitted
inside the generator room, BANM shall pay the CROWN [*] for
electrical service in addition to the monthly rental as outlined earlier.

F.        Emergency Generators
          --------------------
All emergency generators must be fully contained inside BANM's equipment
building. Permanent outside installations are not permitted. With written
approval from CROWN, BANM may connect to CROWN's generator on those limited
sites where BANM is required to provide an alternate power source. All
installation cost are the responsibility of BANM. Approval is contingent upon
CROWN having excess capacity on its generator.

A monthly fee of [*] applies.


          ____________________

               /1/ All dishes heights will be at the minimum height requirement
          per Comsearch frequency coordination to insure quality service and
          reliability and reduce tower loading.

          All microwave dishes larger than 2' must contain a radome cover.

          All grid dishes must contain operational de-icers.

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

                                       22
<PAGE>
 
                         MASTER TOWER LEASE SUPPLEMENT

This Master Tower Lease Supplement ("Lease Supplement") is made and entered into
as of this 17 day of December 1997 by and between Crown Communication Inc.
d/b/a CROWN COMMUNICATIONS hereinafter designated as "CROWN" and Pittsburgh
SMSA, L.P. d/b/a Bell Atlantic Mobile, hereinafter designated as "BAM", pursuant
and subject to that certain Master Tower Lease Agreement (the "Master
Agreement") by and between the Parties hereto, dated as of December 29, 1995.
All capitalized terms have the meanings ascribed to them in the Master
Agreement.

     1.   The Parcel shall consist of that certain parcel of property, located
in the Township of West Deer, the County of Allegheny, and the State of
Pennsylvania, more particularly described as a 12' by 30' parcel containing
approximately Three Hundred Sixty (360) square feet situated at 3700 Sandy Hill
Rd., together with the non-exclusive right for ingress and egress, seven (7)
days a week twenty-four (24) hours a day, on foot or motor vehicle, including
trucks, and for the installation and maintenance of utility wires, poles,
cables, conduits, and pipes over, under, or along a Twenty (20') foot wide 
right-of-way extending from the nearest public right-of-way, Sandy Hill Road
to the demised premises, said premises and right-of-way for access being
substantially as described herein in Exhibit "A" to the Supplement attached
hereto and made a part hereof.

     2.   BAM's Antenna(s) shall consist of nine (9) antennas, each described in
terms of type size, frequency, effective radiated power, and height on the
Tower outlined as follows:


     Manufacturer and type-number:                DAPA 2980.015    

     Number of antennas:                          [*]
                                                  
     Weight and dimension of antenna(s) (LxWxD):  68" X 13" X 8"   
     Transmission line mfr. & type no.:           Andrews Heliax LDF6-50   
     Diameter & length/transmission line:         1 1/4" X 185'   
     Height of antenna(s) on tower:               150/1/   
     Direction of radiation:                      93 , 213, & 333 degrees
                                                  off true North   
     Equipment building/floor space dimensions:   [*]


     3.   The first (1st) annual rental payment due and payable by BAM to CROWN
          is $ 21,900 per year,payable in accordance with the Master Agreement.
              -------
          Any future rent adjustments shall be calculated in accordance with
          Exhibit "D" to the Master Agreement.


     4.   The Commencement Date of this Supplement shall be as outlined in
Paragraph 3 of the Master Agreement except if another Commencement date applies,
in which event it is specified as March 1, 1998.

     5.   The Party's acknowledge that CROWN's rights in the property derive
from a certain Perpetual Easement and Rights of Way Agreement dated January 8,
1997 between CROWN herein and Jeffery D. Salvatora, hereinafter referred to as
the 'Prime Lease' and attached hereto as Exhibit "B" to the Supplement. CROWN
shall not terminate the Prime Lease prior to the expiration of its term or anv
subsequent extension terms without the express written consent of BAM. In the
event CROWN receives any written notice of failure to pav or failure to perform
anv covenant, agreement or obligation under the Prime Lease, CROWN shall notify
BAM of such notice as soon as the notice is received by CROWN pursuant to the
terms of the Prime Lease and BAM may take any such actions to cure any such
failure if CROWN fails to sure the same within sixty (60) days. BAM shall be
under no obligation to take such

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.


<PAGE>
 
                           EXHIBIT "B" to Supplement

                            PRIME LEASE AGREEMENT

<PAGE>
 

                             CROWN COMMUNICATIONS
                        Penn Center West III, Suite 229
                             Pittsburgh, PA  15276


                                October 28, 1997


Richard J. Lynch
Executive Vice President
Bell Atlantic NYNEX Mobile
180 Washington Valley Road
Bedminster, New Jersey  07921

Dear Mr. Lynch:

          Reference is hereby made to (a) the Master Tower Lease Agreement dated
December 29, 1995 between Robert A. Crown d/b/a Crown Communications ("Crown")
and Cellco Partnership, d/b/a  Bell Atlantic NYNEX Mobile, Pittsburgh SMSA L.P.
and PA RSA 6(II) and now d/b/a Bell Atlantic Mobile (collectively referred to
hereinafter as "BAM"), whereby, among other things, BAM leases certain premises
from Crown (the "Crown Master Lease") ; and (b) the Master Tower Lease Agreement
dated December 29, 1995, between BAM and Crown whereby, among other things,
Crown leases certain premises from BAM (the "BAM Master Lease").
 
          This Letter Agreement reflects our agreement to modify and amend the
Crown Master Lease and BAM Master Lease in the following respects:
 
          1.  Section 17 of the Crown Master Lease is hereby deleted in its
entirety.
 
          2.  Section 17 of the BAM Master Lease is hereby amended so as to
delete in their entirety the third and fourth sentences thereof.
 
          3.  The foregoing modifications and amendments to the Crown Master
Lease and the BAM Master Lease shall each be effective as of October 28, 1997.

          Except as otherwise expressly provided herein, the Crown Master Lease
and the BAM Master Lease each remains in full force and effect and is hereby
confirmed in all respects.

          BAM hereby consents to the assignment by Crown of the Crown Master
Lease and the BAM Master Lease to Crown Communication Inc., a wholly owned
subsidiary of Castle Tower Holding Corp. ("CCI"), and the assumption by CCI of
all of the obligations of Crown under the Crown Master Lease and the BAM Master
Lease.

          Please indicate your agreement to the foregoing by executing a
counterpart of this 
<PAGE>
 
Richard J. Lynch
Bell Atlantic NYNEX Mobile
October 28, 1997
Page 2


Letter Agreement and returning it to the undersigned as soon as possible. This
Letter Agreement may be executed by the parties hereto in any number of
counterparts and by the different parties on separate counterparts, and each
such counterpart shall be deemed to be an original, but all such counterparts
shall together constitute one and the same agreement.

                                  Very truly yours,

                                  ROBERT A. CROWN
                                  d/b/a CROWN COMMUNICATIONS


                                  By: ______________________________
                                  Robert A. Crown



                                  CELLCO PARTNERSHIP

                                  by Bell Atlantic NYNEX Mobile, Inc.,
                                  its managing general partner


                                  By: ______________________________
                                  Title:  __________________________


                                  Pittsburgh SMSA, L.P.

                                  by Cellco Partnership, its managing general
                                  partner, by Bell Atlantic NYNEX Mobile, Inc.,
                                  its managing general partner


                                  By: ______________________________
                                  Title:  __________________________
<PAGE>
 
Richard J. Lynch
Bell Atlantic NYNEX Mobile
October 28, 1997
Page 3


                                  Pennsylvania RSA-No. 6(II), L.P.

                                  by Cellco Partnership, its managing general
                                  partner, by Bell Atlantic NYNEX Mobile, Inc.,
                                  its managing general partner


                                  By: ______________________________
                                  Title:  __________________________



          Castle Tower Holding Corp. hereby consents to the execution of this
Letter Agreement by Crown and to the assumption by CCI of all of the obligations
of Crown under the Crown Master Lease and BAM Master Lease.

                                  CASTLE TOWER HOLDING CORP.


                                  By: ______________________________
                                        David L. Ivy
                                        President

<PAGE>
 
                                                                   EXHIBIT 10.20

                        MASTER TOWER LEASE AGREEMENT

     This Agreement, made this 29th day of December 1995, between Cellco 
Partnership, a Delaware General Partnership, d/b/a Bell Atlantic NYNEX Mobile,
Pittsburgh SMSA, L.P., and PA RSA 6 (II) referred to hereinafter by name or
individually and collectively as "BANM" with its principal offices at 180
Washington Valley Road, Bedminster, New Jersey, 07921, hereinafter designated
"BANM", and Robert A. Crown, d/b/a CROWN COMMUNICATIONS, with its principal
mailing address of Penn Center West III, Building #3, Suite 229, Pittsburgh, PA
15276, hereinafter designated "CROWN".

WITNESSETH 

     WHEREAS, Cellco Partnership, a Delaware General Partnership, d/b/a Bell
Atlantic NYNEX Mobile, Pittsburgh SMSA, L.P., and PA RSA 6 (II) are related
entities, each of which operates in different areas to which this Master Tower
Lease Agreement may be applicable. They enter into this Master Tower Lease
Agreement in order to indicate their agreement to the terms and conditions
contained herein. It is the intention and understanding of BANM and CROWN that
individual Lease Supplements, as that term is defined hereinafter, shall be
entered into by only one of the following, Cellco Partnership, d/b/a Bell
Atlantic NYNEX Mobile, Pittsburgh SMSA, L.P., and PA RSA 6 (II), as determined
solely by the BANM.

     WHEREAS, CROWN desires to lease space on certain towers owned by BANM; and

     WHEREAS, BANM and CROWN are desirous of establishing terms and conditions
which will apply to multiple sites which are to be leased by BANM to CROWN,

     In consideration of the mutual covenants contained herein, as well as the
mutual covenants contained in the companion "Master Tower Lease Agreement" in
which BANM herein is the Lessee therein and CROWN herein is the Lessor therein,
which is being executed contemporaneously with this Agreement, and intending to
be legally bound hereby, the Parties hereto agree as follows:

     1.   BANM hereby leases to CROWN that certain space on one or more of
BANM's towers if space is available and the proposed installation is
structurally and frequency compatible together with land for the installation of
CROWN's equipment building(s) or equipment cabinet(s) or temporarily, space
within BANM's equipment building for the installation of CROWN's equipment as
specified on Exhibit "A" to the Supplement attached hereto and made a part
hereof, and together with a non-exclusive right for ingress and egress, seven
(7) days a week, twenty-four (24) hours a day, on foot or motor vehicle,
including trucks and for the installation and maintenance of utility wires,
poles, cables, conduits and pipes over, under or along a right of way over
BANM's property from the nearest public right-of-way to the leased premises.
Said space on BANM's tower, parcel of land for equipment building and right-of-
way are collectively referred to hereinafter as the "Property". The specific
location, description and size of the Property for each particular site will be
described on one or more supplements to this Agreement which BANM and CROWN
shall prepare upon CROWN's decision to occupy a particular property and pursuant
to which the specific described property will be leased by BANM to CROWN, for
the purposes described herein. The form of such supplement is attached hereto as
Exhibit "A" to the Master. This Agreement and the supplements to it shall be
applicable to the areas covered by the following Federal Communications
Commission ("F.C.C.") Licenses: Pittsburgh, Pennsylvania MSA; Pennsylvania 2 -
McKean; Pennsylvania 6.2 - Butler: Pennsylvania 7 - Jefferson; Pennsylvania 9 -
Greene; Pennsylvania 11.2 - Huntington; West Virginia 1 - Mason: West Virginia 
2 - Wetzel: and any new Pittsburgh Supersystem RSA covering portions of Western
Pennsylvania, Ohio, West Virginia and Kentucky and more specifically restricted
to those counties outlined in Exhibit "E" to the Master attached hereto and made
a part hereof acquired by BANM after the date of this Agreement. CROWN shall
indicate its interest in a particular

                                       1
<PAGE>
 
property by completing a site application, sample of which is attached hereto as
Exhibit "C" to the Master. Upon submission of said application by CROWN to BANM,
BANM shall within ten (10) business days of such communication provide CROWN
with the latitudes and longitudes of the Property and all other information
necessary to complete the supplement in each instance. The supplement shall
become effective upon its execution by both BANM and CROWN. BANM shall have the
right to refuse to enter into any supplements in the event that such supplement
would negatively impact the business or network of BANM. The terms and
conditions of this Agreement shall apply to each said supplement, whether
executed simultaneously with this Agreement or subsequent to it. 

     In the event any public utility is unable to use the right-of-way
described in the supplement, BANM hereby agrees to grant, if available, an
additional right-of-way either to CROWN or to the public utility at no cost to
CROWN.

     All future tenants of BANM's tower will be obligated to comply with all
interference requirements as outlined in Paragraph 9 herein.

     CROWN will be responsible for supplying heating, air conditioning, air
conditioning distribution, cable trays, utilities, utility meter or sub-meter
and emergency power.

     CROWN and BANM agree that CROWN shall have the right to replace the
equipment described in the supplement with similar and comparable equipment.

     2.   The term of this Agreement shall be twenty-five (25) years after which
term, the terms and conditions shall survive and govern any remaining
supplements until their termination.

     3.   Each property leased by BANM to CROWN pursuant to an applicable
supplement shall be leased with the commencement date as of the first (1st) day
of the month in which CROWN is granted a building permit by the governmental
agency charged with issuing such permits for the Property unless otherwise
indicated in the supplement. In the event that a building permit is not required
by the said governmental agency, then the commencement date of each applicable
supplement shall be defined as the date of execution by both Parties of the
applicable supplement. The initial term for each supplement shall be for five
(5) years and shall be subject to extension as provided in this Agreement.

     4.   The term of each particular supplement shall automatically be extended
for four (4) additional five (5) year terms unless CROWN terminates it at the
end of the then current term by giving BANM written notice of the intent to
terminate at least six (6) months prior to the end of the then current term.
Notwithstanding the foregoing, if BANM's rights in the Property are derived
from a prime lease with a third party and such prime lease has a shorter term or
extension terms than those provided for under this paragraph, then CROWN's
right to extend any particular supplement shall only be for as long as BANM has
the right to extend its interest in the same applicable property. CROWN shall
have the right to terminate any supplement within ninety (90) days following
written notice to BANM. Notwithstanding the extension provisions contained
herein, there shall be no option to extend the term of any supplement following
termination of this Agreement.

     5.   The annual rental shall be paid in equal monthly installments on the
first (1st) day of each month, in advance, to Bell Atlantic NYNEX Mobile, P.O.
Box 64498, Baltimore, Maryland 21264-4498 or such other person, firm or place as
BANM may, from time to time, designate in writing at least thirty (30) days in
advance of any rental payment date. CROWN will be obligated to include with
each monthly payment, the site identifier, # of antennas and size of equipment
space. The amount of the annual rental shall be that amount as defined on
Exhibit "F" to the Master attached hereto and made a part hereof.

          The annual rental for the first (1st) five (5) year

                                       2
<PAGE>
 
extension term and each and every extension thereafter, shall be adjusted by a
formula as follows:
                            

  [*]

         The Parties agree that the properties presently leased to CROWN by BANM
 as listed in Exhibit "B" to the Master attached hereto and made a part hereof,
 shall be governed by the terms and conditions of this Agreement. Upon execution
 of this Agreement, the amount of the annual rental payments including any back
 rent that has not yet been paid as of the execution date of this Master
 Agreement, shall be that amount as calculated in accordance with and as defined
 on Exhibit "F" to the Master attached hereto and made a part hereof.

         6. CROWN shall use the Property for the purpose of constructing,
 maintaining and operating a Communications Facility and uses incidental thereto
 together with all necessary connecting appurtenances. BANM shall provide a
 security fence around the existing improvements at the Property. All
 improvements to the Property resulting from CROWN's use shall be at CROWN's
 expense. CROWN will maintain the Property in a reasonable condition. It is
 understood and agreed that CROWN's ability to use the Property is contingent
 upon its obtaining after the execution date of this Agreement all of the
 certificates, permits, F.C.C. approvals for full power usage and other
 approvals that may be required by any Federal, State or Local authorities which
 will permit CROWN use of the Property as set forth above. All permits shall be
 filed for and applied for in CROWN's name and a copy of the said authorized
 permit must be provided to BANM prior to the commencement of construction by
 CROWN. BANM shall cooperate with CROWN in its effort to obtain such approvals
 and shall take no action which would adversely affect the status of the
 Property with respect to the proposed use thereof by CROWN. In the event that
 any of such applications should be finally rejected or any certificate, permit,
 license or approval issued to CROWN is canceled, expires, lapses, or is
 otherwise withdrawn or terminated by governmental authority so CROWN in its
 sole discretion will be unable to use the Property for its intended purposes,
 CROWN shall have the right to terminate the supplement concerning the affected
 Property. Notice of CROWN's exercise of its right to terminate shall be given
 to BANM in writing by certified mail, return receipt requested, and shall be
 effective upon the mailing of such notice by CROWN. All rentals paid to said
 termination date shall be retained by BANM. Upon such termination, such
 supplement shall become null and void and the Parties shall have no further
 obligations including the payment of money, to each other.

                                       3


[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.

<PAGE>
 
     7.   BANM agrees CROWN shall have free access to BANM's tower at all times
for the purpose of installing and maintaining CROWN's equipment, and BANM
further agrees to give CROWN during temporary, installation as may be outlined
in a particular Lease Supplement, free ingress and egress to BANM's tower
equipment building during the continuation of this Lease and any renewals
thereof in circumstances in which CROWN's equipment is located within such tower
equipment building. CROWN must notify BANM whenever CROWN. CROWN's tenants or
subcontractors are entering the building, tower or generator room by calling
during normal business hours (412) 496-6000 and during non-normal business hours
1-800-852-2671. CROWN shall be required to provide to BANM a detailed
Intermodulation study with respect to the proposed installation prior to BANM
granting approval of said installation. CROWN, at CROWN's sole expense, shall
have the option of structurally upgrading or replacing BANM's communications
facility to accommodate the additional tenants of CROWN, however, BANM reserves
the right to approve any and all changes and shall retain ownership of the
structure including any, and all structural modifications and support structures
except for CROWN's antennas and cables, throughout the terms of any supplement
and this Agreement. At BANM's option, BANM may request CROWN to provide a
certified structural analysis from the tower manufacturer for BANM's review,
which review shall be completed within ten (10) days of receipt of said analysis
at which time BANM shall advise CROWN whether it approves or disapproves of any
proposed improvement to the tower. In the event CROWN, its tenants or sub-
contractors perform any work at BANM's communications facility, BANM will be
guaranteed by CROWN that BANM will not experience any down time in BANM's
operation and CROWN will indemnify and reimburse BANM for any and all claims of
liability or losses, including but not limited to loss of revenues, by BANM or
any third party resulting from any such down time in BANM's operation. BANM
shall furnish CROWN with necessary keys for the purpose of ingress and egress to
the said site and tower location. It is agreed, however, that only authorized
engineers, employees or properly authorized contractors of CROWN or persons
under their direct supervision will be permitted to enter said Property. CROWN
will retain ownership of all buildings, equipment and appurtenances CROWN
installs at any BANM site on behalf of CROWN or CROWN's tenants, provided
however that the removal of said equipment will not structurally affect the
integrity of the tower.

     8.   It is further understood and agreed BANM must approve of the
installation contractor or personnel chosen by CROWN to install, maintain and
operate the equipment. Said approval by BANM shall be made within ten (10)
business days of CROWNS's submission of said installation contractor or
personnel. Said installation, maintenance and operation will in no way damage or
interfere with BANM's use of the Tower, antennas and appurtenances. BANM's
approval of the installation contractor or personnel shall not be unreasonably
withheld or delayed. If damage or interference is caused by CROWN, and CROWN
fails to make such repairs immediately after notice by BANM, BANM may make the
repairs and the reasonable costs thereof shall be payable to BANM by CROWN on
demand. If CROWN does not make payment to BANM within thirty (30) days after
such demand, BANM shall have the right to declare this Agreement in default and
terminate the same without any further notice or demand to CROWN. BANM covenants
that it will keep the tower in good repair as required by federal law H.R.
6180/S. 2882, the Telecommunications Authorization Act of 1992 including
amendments to Sections 303(q) and 503(b) (5) of the Communications Act of 1934.
BANM shall also comply with all rules and regulations enforced by the F.C.C.
with regard to the lighting, marking and painting of towers. If BANM fails to
make such repairs immediately after notice by CROWN, CROWN may make the repairs
and the reasonable costs thereof shall be payable to CROWN by BANM on demand. If
BANM does not make payment to CROWN within thirty (30) days after such demand,
CROWN shall have the right to deduct the costs of the repairs from the
succeeding monthly rental amounts normally due from CROWN to BANM.

     No materials may be used in the installation of the antennas or
transmission lines that will cause corrosion or rust or deterioration of the
tower structure or its appurtenances.

     Each antenna must be identified by color coding or a metal tag fastened
securely to its bracket on the tower and each transmission line is to be tagged
at the conduit opening where it enters the equipment building.

                                       4
<PAGE>
 
     CROWN shall comply with all specifications with regard to construction,
radio frequency and installation on BANM's tower as outlined in Exhibit "D" to
the Master attached hereto and made a part hereof.

     If CROWN causes damage to the tower, CROWN agrees to repair such damage
with reasonable promptness at its own cost and expense.

     9.   CROWN for itself and on behalf of all of its tenants, licensees and/or
users agree(s) to have installed transmitting and receiving equipment of the
type and frequency which will not cause measurable interference as defined by
the F.C.C. to BANM, other lessees of the premises or neighboring landowners. In
the event CROWN's equipment causes such interference, CROWN will take all steps
necessary to correct and eliminate the interference. BANM agrees that any of its
future tenants of the premises who take possession after the date of execution
of any supplement will have installed transmitting and receiving equipment of
the type and frequency which will not cause measurable interference as defined
by the F.C.C. In the event any equipment of future tenant of BANM causes
interference, BANM will see that said tenant takes all steps necessary to
correct and eliminate the interference and tenant ceases operation until said
interference is eliminated.

     10.  CROWN agrees to maintain the antennas, transmission lines and other
appurtenances, in proper operating condition and maintain same as to appearance
and safety.

     11.  All installations and operation in connection with this Agreement by
CROWN shall meet with all applicable rules and regulations of the Federal
Communications Commission, Federal Aviation Agency and all applicable codes and
regulations of the township, county and state concerned. Under this Agreement,
BANM assumes no responsibility for the licensing, operation, and/or maintenance
of CROWN's radio equipment.

     12.  CROWN shall indemnify and hold BANM and all subsidiary companies and
affiliates harmless against any claim of liability or loss from bodily injury
and/or property damage resulting from or arising out of CROWN's and/or any of
its subcontractors', tenants', servants', agent's or invitees' use or occupancy
of the Property excepting, however, such claims or damages as may be due to or
caused by the acts of BANM, or its servants, agents or invitees. CROWN, its
tenants and subcontractors shall provide BANM with a Certificate of Insurance
evidencing the required insurance coverage as indicated in Section 13 below and
as outlined on Exhibits "G-l" and "G-2" to the Master attached hereto. Said
insurance certificates shall show BANM and all subsidiary companies and
affiliates of BANM as additional insured.

     13.  CROWN shall maintain Commercial General Liability insurance in an
amount no less than $1,000,000 per occurrence Combined Single Limit for bodily
injury and/or property damage and $2,000,000 in the Aggregate. Umbrella
Liability in an amount no less than $10,000,000.00 per occurrence and
$10,000,000 in the aggregate. Coverage will include but not be limited to the
following extensions: contractual liability, independent contractors liability,
premises/operation and products/completed operations. CROWN shall maintain
automobile liability insurance in an amount no less than $1,000,000.00 Combined
Single Limit for bodily injury and/or property damage. Insurance will include
coverage for all automobiles including hired and non-owned.

     CROWN shall maintain Statutory Worker's Compensation insurance and
Employer's Liability in an amount no less than $1,000,000.00 per occurrence.

     CROWN will carry All-Risk Property Insurance on a Full Replacement Cost
basis to insure all of its personal property including equipment and tools.

     At execution of this Agreement, CROWN will provide BANM with Certificates
of Insurance evidencing the above referenced coverages. The Certificate will
state that BANM and all subsidiary companies and affiliates are added as
additional insured on the General Liability, Umbrella Liability and Automobile
Liability policies.

                                       5
<PAGE>
 
CROWN shall require all of its tenants and subcontractors to maintain similar
coverage which shall also name the required entities as additional insured. All
policies shall be endorsed to be primary. BANM must be given thirty (30) days
notice of cancellation and/or material change to the policy. CROWN shall
assume responsibility for such notification being given to BANM.

     All insurers will be Best Rated AA or better.

     The Parties hereby waive any and all rights of action for negligence
against the other which may hereafter arise on account of damages to the
premises or Property, resulting from any fire, or other casualty of the kind
covered by standard fire insurance policies regardless of whether or not, or in
what amounts such insurance is now or hereafter carried by the Parties, or
either of them. CROWN shall obtain a Waiver of Subrogation from its insurance
company in which the insurance company also waives its rights to recover.

     14.  CROWN shall pay as additional rent any increase in real estate taxes
levied against the leased Property which are directly attributable to the
improvements constructed or installed by CROWN.

     15.  BANM and CROWN acknowledge that they will be entering into one other
"Master Tower Lease Agreement" in which BANM herein is Lessee therein and CROWN
herein is Lessor therein, which will be executed contemporaneously with this
Agreement. The Parties agree that any default or breach of anyother such
Agreement shall be considered a default or breach of this Agreement. In the
event of a material default or breach of this Agreement, the other Party may, in
addition to any other remedies available at law or in equity, declare both
"Master Tower Lease Agreements" null and void. However, neither Party shall
have the right to declare a default or breach on the part of the other Party or
to terminate or declare null and void the Master Tower Lease Agreements until
the alleged defaulting Party has had an opportunity to cure as hereinafter set
forth. The non-defaulting Party shall provide to the other Party notice setting
forth the nature and extent of the default. In the event of a monetary
default, the default must be cured within ten (10) days after notice of the
same. In the event of a non-monetary default, the defaulting Party shall have
thirty (30) days to cure the same, or such extended period as may be required to
cure such default provided the defaulting Party commences the cure within the
said thirty (30) days period and thereafter continuously and diligently pursues
the cure to completion.

     16.  CROWN, upon termination of the Agreement, or the applicable
supplement, shall, within a reasonable period, remove its equipment, personal
property and all fixtures and restore the Property to its original condition,
reasonable wear and tear excepted. If such time for removal causes CROWN to
remain on the Property after termination of this Agreement, CROWN shall pay rent
at the then existing monthly rate or on the then existing monthly pro-rata basis
if based upon a longer payment term, until such time as the removal of the
equipment, personal property and all fixtures are completed.

     17.  Should BANM at any time during the term of any supplement, decide to
sell all or any part of the Property to a purchaser other than CROWN, such sale
shall be under and subject to this Agreement and any such applicable supplement
and CROWN's rights hereunder, and any sale by BANM of the portion of this
Property underlying the right-of-way herein granted shall be under and subject
to the right of CROWN in and to such right-of-way.

     Should BANM decide to vacate any property, BANM shall notify CROWN sixty
(60) days prior to such vacation. In the event BANM decides to sell any
property, CROWN shall have the right of first refusal to meet any bona fide
offer of sale on the same terms and conditions of such offer. If CROWN fails to
meet such bona fide offer within from forty five (45) days after notice thereof
from BANM, BANM may sell the property or portion thereof to such third person in
accordance with the terms and conditions of this offer.

                                       6
<PAGE>
 
     18.  BANM covenants that CROWN, on paying the rent and performing the
covenants shall peaceably and quietly have, hold and enjoy the leased Property.

     19.  BANM covenants that BANM is seized of good and sufficient interest to
the Property and has full authority to enter into and execute this Agreement.
BANM further covenants that there are no other liens, judgments or impediments
affecting its interest in the Property. BANM further covenants that there are no
easements, rights-of-ways or restrictions which encroach upon the Property
which is leased under this Agreement and which interfere with CROWN's use of the
Property as contemplated under this Agreement.

     20.  It is agreed and understood that this Agreement and all supplements to
it contain all the agreements, promises and understandings between BANM and
CROWN and that no verbal or oral agreements, promises or understandings shall be
binding upon either BANM or CROWN in any dispute, controversy or proceeding at
law, and any addition, variation or modification to this Agreement shall be void
and ineffective unless made in writing signed by the Parties.

     21.  This Agreement and the performance thereof shall be governed,
interpreted, construed and regulated by the laws of the state of the location of
the Property indicated in the supplement.

     22. This Agreement may be sold, assigned or transferred by CROWN without
any prior approval or consent of BANM to CROWN's affiliates or subsidiaries. As
to other parties, this Agreement may not be sold, assigned or transferred
without the written consent of BANM which such consent will not be unreasonably
withheld.

     Within the areas to which this Agreement is applicable as outlined in
Exhibit "E" to the Master, CROWN shall have the exclusive right to sublet all
or part of the Property subject to the approval of BANM which approval will not
be unreasonably withheld or delayed and subject to a different standard of
approval and limitation on subletting as set forth in the next paragraph.
However, notwithstanding the foregoing, BANM shall have the right to directly
sublet to AT&T Wireless, Horizon Cellular Telephone Company of Crawford, L.P.,
emergency service providers as selected by BANM and to any entity owned,
controlled or managed by Bell Atlantic or NYNEX Corporations or any of their
affiliates or subsidiaries.

     The Parties further agree and acknowledge that CROWN may not sublet
without BANM's prior written consent which consent shall be in the absolute
discretion of BANM, any or all of the Property to any competitor of BANM
providing cellular or communications carrier services or to any competitor of
BANM providing personal communications services. Further, CROWN may not sublet
to any entity, owned, controlled or managed by Bell Atlantic or NYNEX
Corporations or any of their affiliates or subsidiaries. Additionally, if BANM
has in place a master agreement dealing with non-monetary terms and conditions
with any third party, CROWN shall be obligated to use said master agreement in
subletting to any such third party.

     For purposes of this Section, an affiliate or subsidiary of Bell Atlantic
or NYNEX Corporations shall be deemed to be entity in which either corporation
directly or indirectly has an ownership, equity or management position of at
least two and one-half percent (2-1/2%). With respect to CROWN, an affiliate or
subsidiary is an entity in which CROWN owns more than fifty percent (50%)

     23.  All notices hereunder must be in writing and shall be deemed validly
given if sent by certified mail, return receipt requested, addressed as follows
(or any other address that the Party to be notified may have designated to the
sender by like notice):

     As to BANM:    Bell Atlantic NYNEX Mobile                
                    180 Washington Valley Road                
                    Bedminster, New Jersey 07921

                                       7
<PAGE>
 
                    Attention: Staff Director - Real Estate

     As to CROWN:   Robert Crown
                    Crown Communications      
                    Penn Center West III      
                    Building #3, Suite 229  
                    Pittsburgh, PA 15276       

     24.  This Agreement shall extend to and bind the heirs, personal
representatives, successors and assignees of the Parties hereto. The Parties
further agree that all of the provisions in this Agreement shall affect and bind
any and all tenants or occupants of the Property who come upon the same through
or by agreement with either Party. Each Party shall be fully responsible to
ensure that any and all tenants or occupants of the Property who come upon the
same through or by agreement with that Party comply with all of the terms and
provisions of this Agreement and such Party shall be fully liable and
responsible for any breaches of this Agreement by its tenants or occupants.

     25.  The Parties acknowledge that BANM's rights in the Property may be
derived from a separate agreement with a third party hereinafter referred to as
a "Prime Lease Agreement" in which BANM herein is lessee, grantee or licensee
therein. If this is the case, the parties to such Prime Lease Agreement and the
date of such Prime Lease Agreement shall be designated in the particular
supplement, and a copy of said Prime Lease shall be attached as Exhibit " B" to
the Supplement, and the following provisions shall be applicable. In the event
approval of the prime lessor, grantor or licensor is required in the Prime Lease
Agreement, the effectiveness of any supplement concerning such property shall be
specifically subject to the obtaining of such approval. Further, all the terms,
conditions and covenants contained in this Agreement and any supplement shall be
specifically subject to and subordinate to the terms and conditions of any Prime
Lease Agreement affecting the Property which is the subject of the particular
supplement. In the event any of the provisions of the Prime Lease Agreement
supersede or contradict the terms of this Agreement, such terms of this
Agreement shall be deemed deleted or superseded to the extent of the
contradiction as applicable to the space utilized by CROWN. Further, CROWN
agrees to be bound by and agrees to perform all the acts and responsibilities
required of the lessee pursuant to the Prime Lease Agreement. Lastly, in the
event the Prime Lease Agreement terminates for any reason, the supplement
relating to the Property covered by said Prime Lease Agreement, shall be deemed
to have terminated effective the date of the termination of the Prime Lease
Agreement.

     26.  Notwithstanding anything to the contrary contained herein, BANM may
terminate any supplement upon three (3) months notice to CROWN in the event the
continuation of that supplement is prohibited by, interferes with or will
negatively impact BANM as a result of governmental regulation, approval or
legislation.

     In the event any previously approved zoning or Governmental permit
affecting the use of the property as a communications facility is withdrawn or
terminated, the supplement relating to the property covered by said permit or
approval shall be deemed to have been terminated effective the date of the
termination of the permit or approval.

     27.  This Agreement revokes and supersedes any other oral or written
agreements between the Parties, whether or not in writing, that pertain to the
subject matter described herein.

     28.  The Parties agrees that without the express written consent of the
other Party, neither Party shall reveal, disclose or promulgate, except to such
third party's auditor, accountant or attorney or to a governmental agency if
required by regulation, subpoena or government order to do so.

                                       8
<PAGE>
 
     29.  For those properties that BANM owns, BANM agrees to execute a
Memorandum of this Lease Agreement which CROWN may record with the appropriate
Recording Officer. The date set forth in the Memorandum of Lease is for
recording purposes only and bears no reference to commencement of either term or
rent payments of a particular supplement.

     30.  CROWN agrees that CROWN will use its best efforts to market BANM's
sites covered by this Agreement for the mutual benefit of CROWN and BANM.

     31.  Any obligations imposed on CROWN in this Agreement shall be equally
and fully applicable to any tenants, subcontractors or other third parties that
CROWN brings onto BANM's property or comes upon BANM's property through or
under the authority of CROWN.

     Any breach by such tenants, subcontractors or other third parties shall be
deemed a breach by CROWN under this Agreement and CROWN shall be fully liable
and responsible to BANM pursuant to the terms of this Agreement for such
breach.

     32.  CROWN shall have the right to obtain from the prime lessor at its
own cost and expense, a non-disturbance agreement with respect to any
mortgages affecting the Property. However, BANM shall have no obligation to
obtain or assist in obtaining the non-disturbance in benefit of CROWN. In the
event CROWN obtains financing with respect to CROWN's equipment or personal
property at a site, BANM hereby waives any claim that it might have in such
equipment or personal property superior to the proposed lender or financing
institution. BANM agrees to execute any document reasonably necessary to
evidence such waiver.

     IN WITNESS WHEREOF, the Parties hereto have set their hands and affixed
their respective seals the day and year first above written.

                            CELLCO PARTNERSHIP                           
                            by Bell Atlantic NYNEX Mobile, Inc.          
                            its managing general partner                 
                                                                         
[SIGNATURE ILLEGIBLE]       BY:  /s/ Richard J. Lynch                         
- ----------------------           ----------------------                  
WITNESS                          Richard J. Lynch                         
                                 Executive Vice President and            
                                 Chief Technical Officer                 
                                                                         
                            Pittsburgh SMSA, L.P.                        
                            by Cellco Partnership, its managing general partner
                            by Bell Atlantic NYNEX Mobile, Inc., its managing
                            general partner                                 
                                                                             
[SIGNATURE ILLEGIBLE]       BY:  /s/ Richard J. Lynch                         
- ----------------------           ----------------------                        
WITNESS                          Richard J. Lynch                            
                                 Executive Vice President and                
                                 Chief Technical Officer                     

                       SIGNATURES CONTINUED ON NEXT PAGE

                                       9
<PAGE>
 
                          Pennsylvania RSA No. 6 (II), L.P.
                          by Cellco Partnership, its managing general partner.
,
                          by Bell Atlantic NYNEX Mobile, Inc., its managing 
                          general partner

[SIGNATURE ILLEGIBLE]     BY:   /s/ Richard J. Lynch                           
- ----------------------          ----------------------                        
WITNESS                         Richard J. Lynch              
                                Executive Vice President and  
                                Chief Technical Officer        

                                Robert A. Crown.
                                d/b/a CROWN COMMUNICATIONS

[SIGNATURE ILLEGIBLE]     BY:   /s/ Robert A. Crown
- ----------------------          ---------------------- 
WITNESS                         Robert A. Crown

                                      10
<PAGE>
 
                           Exhibit "A" to the Master
                                   (1 of 2)

                         MASTER TOWER LEASE SUPPLEMENT

        This Master Tower Lease Supplement ("Lease Supplement") is made and 
entered into as of this _______________ day of _______________, 199_, by and 
between ____________________________________ d/b/a Bell Atlantic NYNEX Mobile, 
hereinafter designated as "BANM" and Robert A. Crown, d/b/a CROWN 
COMMUNICATIONS, hereinafter designated as "CROWN", pursuant and subject to that 
certain Master Tower Lease Agreement (the "Master Agreement") by and between the
Parties hereto, dated as of December __, 1995. All capitalized terms have the 
meanings described to them in the Master Agreement.

        1.  The Parcel shall consist of that certain parcel of property, located
in the City of _____________, the County of ____________________, and the State 
of _________________, more particularly described as a _________' by __________'
parcel containing approximately ___________ square feet situated at __________
_________________________________ (add legal description), together with the 
non-exclusive right for ingress and egress, seven (7) days a week twenty-four 
(24) hours a day, on foot or motor vehicle, including trucks, and for the 
installation and maintenance of utility wires, poles, cables, conduits, and 
pipes over, under, or along a __________ (    ') foot wide right-of-way 
extending from the nearest public right-of-way, _____________________ to the 
demised premises, said premises and right-of-way for access being substantially
as described herein in Exhibit "A" to the Supplement attached hereto and made a 
part hereof.

        2.  CROWN's antenna(s) shall consist of _________ antennas, each 
described in terms of type, size, frequency, effective radiated power, and 
height on the tower outlined as follows:

<TABLE> 
        <S>                                             <C>   
        Manufacturer and type-number:                   ______
                                                        ______
                                                        ______
        Number of antennas:                             ______
        Weight and dimension of antenna(s) (LxWxD):     ______
        Transmission line mfr. & type no.:              ______
        Diameter and length/transmission line:          ______
        Height of antenna(s) on tower:                  ______
        Direction of radiation:                         ______
        Equipment building/floor space dimensions:      ______ 
</TABLE> 

        3.  The first (1st) annual rental payment due and payable by CROWN to 
BANM is $___________ per year, payable in accordance with the Master Agreement. 
Any future rent adjustments shall be calculated in accordance with Exhibit "F" 
of the Master Agreement.

        4.  The Commencement Date of this Supplement shall be as outlined in 
Paragraph 3 of the Master Agreement except if another commencement date applies,
in which event it is specified as _________________, 19  .

        5.  The Parties acknowledge that BANM's rights in the property derive 
from a certain Lease Agreement dated ______________________ between BANM herein 
and ________________________ hereinafter referred to as the "Prime Lease" and 
attached hereto as Exhibit "B" to the Supplement. BANM shall not terminate the 
Prime Lease prior to the expiration of its term or any subsequent extension
terms without the express written consent of CROWN. In the event BANM receives
any written notice of failure to pay or failure to perform any covenant,
agreement or obligation, BANM shall notify CROWN of such notice as soon as the
notice is received.

                                      11

<PAGE>
 
                           Exhibit "A"to the Master
                                   (2 of 2)

by BANM pursuant to the terms of the Prime Lease and CROWN may take any such
actions to cure any such failure if

BANM fails to cure the same within sixty (60) days. CROWN shall be under no
obligation to take such action but may do so solely at its own discretion. In
the event CROWN pays any amount or performs any obligations on behalf of BANM
pursuant to the terms of the Prime Lease, CROWN may deduct such amounts paid or
the reasonable value of the performance from the amount that would otherwise be
due from CROWN to BANM pursuant to this Agreement.

     IN WITNESS WHEREOF, the Parties hereto have set their hands and affixed
their respective seals the day and year first above written.

                                        __________________________
                                        CELLCO PARTNERSHIP
                                        by Bell Atlantic NYNEX Mobile, Inc.
                                        its managing general partner

__________________________        BY:   __________________________
WITNESS                                 Richard J. Lynch
                                        Executive Vice President and
                                        Chief Technical Officer


                                        Robert A. Crown,
                                        d/b/a CROWN COMMUNICATIONS


__________________________        BY:   __________________________
WITNESS                                 Robert A. Crown

                                      12
<PAGE>
 
                         EXHIBIT "A" to the Supplement

                             Property Description

                                      13
<PAGE>
 
                         EXHIBIT "B" to the Supplement

                             PRIME LEASE AGREEMENT

                                      14
<PAGE>
 
                          Exhibit "B" to the Master

                  CURRENT PROPERTIES LEASED BY BANM TO CROWN


<TABLE> 
<CAPTION> 
SITE                     SITE DESIGNATION              TENANT  
- ----                     ----------------              ------  
<S>                      <C>                           <C>  
PIT BZZ (Mc Murray)           32                       Pagenet 
                                                       USA Mobile

PIT C (Irwin)                 11                       Pagenet 
                                
PIT JVV (Plum)                14                       Pagenet
                                                       Winstar  
                                
PIT L (Hampton)                4                       Pagenet  
                                
PIT L94A (West Deer)          85                       Pagenet 
                                
PIT R (Aliquippa)             33                       Pagenet  
                                
PIT V (Vandergrift)           92                       Armstrong County 9-1-1
                                
PIT XY (New Stanton)          52                       Pagenet  
                                
GRE D (Waynesburg)            80                       American Paging
</TABLE> 

                                      15
<PAGE>
 
                           EXHIBIT "C" to the Master

                                                        Date Received: ________
                                                          Page 1 of 3

                          BELL ATLANTIC NYNEX MOBILE
                              TOWER SITE LEASING
                                APPLICANT FORM


I.     GENERAL INSTRUCTIONS

       Please fill out the appropriate information and attach your check for the
non-recurring fee and return to:

          Herb Hungerman                   with a copy to: Terri Taylor-Mikes
          Bell Atlantic NYNEX Mobile                 Bell Atlantic NYNEX Mobile
          Pittsburgh, PA                             fax (908) 306-7735   
          fax (412) 496-6171 

II.    COMPANY INFORMATION   

  Company Name:                              _________________________________
                                            
  Address:                                   _________________________________
                                        
                                             _________________________________

  Contact Name:                              _________________________________

  Contact Title:                             _________________________________

  Contact Reach Number:                      _________________________________

  Brief description of purpose of system:    _________________________________

                                             _________________________________

  Contract to be executed by:                _________________________________

III.   BANM SITE OF INTEREST

  Street Address:                            _________________________________  

  Town, State:                               _________________________________

  Latitude:                                  _________________________________

  Longitude:                                 _________________________________

================================================================================
(INTERNAL USE ONLY)

Site Designation:                                _____________________________

Tower Height/Type:                               _____________________________

Building Size:                                   _____________________________

Tenants:                                         _____________________________
                                                                 Page 2 of 3

                                      16
<PAGE>
 
IV.  NON-RECURRING FEES      

     One-Time Non-Recurring Fee:      

     Payable to:                               ______________________________

                         (ATTACH CHECK TO APPLICATION)
          The above fee is a one-time non-recurring and non-refundable
          processing fee. The payment of and the acceptance of this
          processing fee do not constitute any express or implied
             approval of this application. Whether the application is
               approved or not, the processing fee shall not be
               returned or refunded in whole or in part.



V.   ANTENNA INFORMATION   

 Manufacturer and Type:                      ________________________________
 
 Number of Antennas:                         ________________________________  

 Weight and Height of Antenna(s):            ________________________________
 
 Transmission Line Mfr. and Type No.         ________________________________

                                                    "          "
 Diameter and Length of Transmission Line:   ________ X ________

 Height of Antenna(s) on Tower:              ________________________________

 Tower Leg:                                  ________________________________

 Direction of Radiation:                     ________________________________   
 
 Rated Power                                 ________ Watts ERP   

 Transmit Frequency:                         ________ MHz

 Receive Frequency:                          ________ MHz

VI.  BASE STATION EQUIPMENT

 Manufacturer:                               ________________________________

 Model Number:                               ________________________________

 Power Outputs (WATTS):                     _________________________________

                                      17
<PAGE>
 
                                                                Page 3 of 3

VII. TRANSMITTER INTERMOD PROTECTION

  Ferrite Isolator Mfr:                          Model:   
                                   _____________        _____________
  Isolation (db):                  _____________        _____________  
                                   _____________        _____________
  Duplexor Mfr:                                  Model:
  Frequencies (MHz):               _____________        _____________
                                   _____________        _____________
                                   _____________        _____________
  Multi Channel Combiner Mfr:                    Model:
                                   _____________        _____________  
                                   _____________        _____________
                                   _____________        _____________
                                                 Model:
  Band Pass Cavity Mfr:            _____________        _____________
  Number of Cavities:              _____________        _____________  
  Frequency (MHz):                 _____________        _____________
                                   _____________        _____________ 
  Band Pass Filter Mfr:                          Model:   
  Frequency Range (MHz):           _____________        _____________
                                   _____________        _____________
                                   _____________        _____________
  Notch Filters Mfg.:                            Model:   
                                   _____________        _____________   
  Number of Notches:                      Frequency Range (MHz):
                              ___________                       ___________


VIII.  LAND/BUILDING/POWER REQUIREMENTS

   Building/Shelter Size:                    ________________________

   Building/Shelter Type:                    ________________________

   Required AC Power                         ________________________


IX.  ATTACH MANUFACTURER'S SPECIFICATIONS OF ANTENNAS, EQUIPMENT AND SHELTER.
     
           THIS APPLICATION IS SUBJECT TO BELL ATLANTIC NYNEX MOBILE
                       ENGINEERING APPROVAL AND MAY ALSO
                  BE SUBJECT TO LOCAL ZONING OR CONSTRUCTION
                 APPROVAL WHICH MAY REQUIRE LANDOWNER CONSENT

                                      18
<PAGE>
 
                         Exhibit "D" to the Master    

                              Revision: 4/6/95   
                               SITE STANDARDS  
                               --------------

1.   GENERAL

A.   PURPOSE 

The purpose of these Site Standards is to create a quality site installation.
These standards are to be in effect for each site at which CROWN has equipment
in, on or at the site and at which CROWN has a right to occupy pursuant to the
lease to which this document is an attachment.

B.   STATE AND NATIONAL STANDARDS

1.   All installations must conform with all state and national regulations and
     the following state and national codes or any supplements, amendments or
     provisions which supersede them:

     a.   American National Standards Institute:
          ANSI/EAI-222E Structural Standards for Steel Antenna Towers and 
          Antenna Supporting Structures
     b.   Federal Aviation Administration Regulations: 
          Vol. XI, Part 77 Objects Affecting Navigable Airspace
          Advisory Circular Obstruction Marking and Lighting AC 70/7460 
          Advisory Circular High Intensity Obstruction Lighting Systems AC 
          150/5345-43,
          FAA/DOD Specifications L-856
     c.   Federal Communications Commission Rules and Regulations:
          Code of Federal Construction, Marking and Lighting of Antenna
          Regulations Title 47 Structures Chapter 1, Part 17
     d.   National Electrical Code
     e.   Building Officials and Code Administrators International, Inc.
          Basic National Building Code
          Basic National Mechanical Code
          State Building Code
     f.   National Fire Protection Association
          Code 101 - Life Safety
          Code 90A - Air Conditioning and Ventilating Systems
          Code 110 - Emergency and Standby Power Systems
     g.   State Fire Safety Code
     h.   Occupational Safety and Health Administration           
          Safety and Health Standards (29 CFR 1910) General Industry
          Subpart R Special Industries
          1910.268 Telecommunications
          1926.510Subpart M Fall Prevention
     i.   Motorola Grounding Guideline for Cellular Radio Installations,
          Document No. 68P81150E62,7/23/92 OR AT&T 
               AUTOPLEX (R) Cellular Telecommunications Systems, Lightning 
               Protection and Grounding, Customer Information Bulletin 
               148B, August 1990, or latest revision.

C.   GENERAL/APPROVAL

1.   All users shall furnish the following to BANM prior to installation of any
     equipment:

     a.   Completed Application. (CROWN must make new Application to BANM for
               change in Antenna position or type.)
     b.   Fully executed supplement.
     c.   Copies of FCC Licenses and construction/building permits.
     d.   Final site plan outlining property boundaries, improvements, easements
               and access.
     e.   Accurate block diagrams showing operating frequencies, all system
               components (active or passive) with gains and losses in dB, along
               with power levels.
     
2.   The following will not be permitted at the facility without the prior
     written consent of BANM.

     a.   Any equipment without FCC type acceptance or equipment which does not
          conform to FCC rules and regulations.
     b.   Add-on power amplifiers.
     

                                       19
<PAGE>
 
     c.   "Hybrid" equipment with different manufacturers' RF strips.
     d.   Open rack mounted receivers and transmitters.
     e.   Equipment with crystal oscillator modules which have not been
          temperature compensated.
     f.   Digital/analog hybriding in exciters, unless type-accepted.
     g.   Non-continuous duty rated transmitters used in continuous duty
          applications.
     h.   Transmitter outputs without a harmonic filter and antenna
          matching circuitry.
     i.   Change in operating frequency(ies).
     j.   Ferrite devices looking directly at an antenna.
     k.   Nickel plated connectors.
     l.   Cascaded receiver multicouplers/preamps.
     
3.   All emergencies are to be reported immediately to 1-800-852-2671.
     
D.   LIABILITY

It shall be the responsibility of CROWN to comply with all of the site standards
set forth herein. CROWN specifically agrees to indemnify and hold harmless BANM
against any claim of liability, loss, damage or costs including reasonable
attorney's fees, arising out of or resulting from CROWN's non-compliance with
the standards set forth herein.

E.   INSPECTION

BANM reserves the right to inspect CROWN's area without prior notice at any time
during the term of the Lease Agreement in order to ensure compliance with the
standards set forth herein. Any such inspection shall be solely for the benefit
and use of BANM and does not constitute any approval of or acquiescence to the
conditions that might be revealed during the course of the inspection.

BANM reserves the right to inspect BANM's area without prior notice.

F.   DISCLAIMER OF RESPONSIBILITY

It is the intention of BANM and CROWN that the standards set forth herein are
part of the Agreement between them. It is specifically agreed that they are not
intended to be relied upon or to benefit any third party. Further, BANM shall
have no liability or responsibility to any third party as a result of the
establishment of the standards set forth herein, any inspection by BANM of
CROWN's area in order to determine compliance with the standards, the
sufficiency or lack of sufficiency of the standards, or CROWN's compliance or
non-compliance with the standards, and CROWN agrees to indemnify and hold
harmless BANM against any claim by a third party resulting from such theories.

G.   NOTICES

All contacts or notices required or permitted by the CROWN pursuant to these
Site Standards shall be provided in writing to BANM's Director - Operations or
his or her designee and any approval or consent by the BANM shall only be
effective if executed in writing by the BANM's Director - Operations or his or
her designee.
        
II.  RADIO FREQUENCY INTERFERENCE PROTECTIVE DEVICES

A.   If due to CROWN's use or proposed use, there exists any change to the RF
     environment it will be at BANM's sole discretion to require any or all of
     the following:

1.   IM protection panels can be installed in lieu of separate cavity and
     isolator configurations. BANM approval required.
2.   30-76 Mhz
     - Isolators required
     - TX output cavity - minimum of 20 Db rejection @ plus or minus 5 Mhz
3.   130-174 Mhz
     - Isolators - minimum of 30 Db with bandpass cavity
4.   406-512 Mhz
     - Isolators - minimum of 60 Db with bandpass cavity
5.   806-866 Mhz 
     - Isolators - minimum of 60 Db with bandpass cavity
6.   866 Mhz and above - as determined by BANM.
     
B.   Additional protective devices may be required based upon BANM's evaluation
     of the following information:

1.   Theoretical Transmitter (TX) mixes.
2.   Antenna location and type
3.   Combiner/multicoupler configurations

                                       20
<PAGE>
 
4.   Transmitter specifications      
5.   Receiver specifications
6.   Historical problems
7.   Transmitter to transmitter isolation
8.   Transmitter to antenna isolation
9.   Transmitter to receiver isolation
10.  Calculated and measured level of Intermodulative (IM) products
11.  Transmitter output power
12.  Transmitter Effective Radiated Power (ERP)
13.  Spectrum analyzer measurements
14.  Voltage Standing Wave Radio (VSWR) measurements
15.  Existing cavity selectivity
     
C.   CROWN will be required to immediately correct excessive cabinet leakage
     which causes interference to other tenants.
     
III. ANTENNAS AND ANTENNA MOUNTS

A.   All mounting hardware to be utilized by CROWN to be as specified by tower
     manufacturer and approved by BANM.
B.   Connections to be taped with stretch vinyl tape (Scotch #33-T or
     equivalent) and Scotchkoted or equivalent (including booted pigtails).
C.   Must meet manufacturer's VSWR specifications.
D.   Any corroded elements must be repaired or replaced.
E.   Must be DC grounded type, or have the appropriate lightning protection as
     determined by BANM.
F.   No welding or drilling on mounts will be permitted.
G.   All antennas must be encased in fiberglass radomes and be painted or
     impregnated with a color designated by BANM as the standard antenna color
     for aesthetic uniformity.
     
IV.  CABLE

A.   All antenna lines to be approved by BANM.
B.   All transmission line(s) will be installed and maintained to avoid kinking
     and/or cracking.
C.   Tagged with weatherproof labels showing manufacturer, model, and owner's
     name at both ends of cable run.
D.   Any cable fasteners exposed to weather must be stainless steel.
E.   All interconnecting cables/jumpers must have shielded outer conductor and
     approved by BANM.
F.   Internally, all cable must be run in troughs or on cable trays and on cable
     or waveguide bridges at intervals of no less than 3'. Externally, all cable
     must be attached with stainless steel hangers and non-corrosive hardware.
G.   All unused lines must be tagged at both ends showing termination points
     with the appropriate impedance termination at each end.
H.   All AC line cords must be 3 conductor with grounding plugs.
I.   All antenna transmission lines shall be grounded at both the antenna and
     equipment ends and at building entry point, with
     the appropriate grounding kits.
J.   All cables running to and from the exterior of the cabinet must be 100%
     ground shielded. Preferred cables are: Heliax, Superflex or braided grounds
     with foil wrap.
     
V.   CONNECTORS

A.   Must be Teflon filled, UHF or N type, including chassis/bulkhead
     connectors.
B.   Must be properly fabricated (soldered if applicable) if field installed.
C.   Must be taped and Scotchkoted or equivalent at least 4" onto jacket if
     exposed to weather.
D.   Male pins must be of proper length according to manufacturer's
     specifications.
E.   Female contacts may not be spread.
F.   Connectors must be pliers tight as opposed to hand tight.
G.   Must be silver plated or brass.
H.   Must be electrically and mechanically equivalent to Original Equipment
     Manufacturers (OEM) connectors.
     
VI.  RECEIVERS

A.   No RF preamps permitted in front end unless authorized by BANM.
B.   All RF shielding must be in place.
C.   VHF frequencies and higher must use helical resonator front ends.

                                       21
<PAGE>
 
D.    Must meet manufacturer's specifications, particularly with regard to
      bandwidth, discriminator, swing and symmetry, and spurious responses.
E.    Crystal filters/pre-selectors/cavities must be installed in RX legs
      where appropriate.
F.    All repeater tone squelch circuitry must use "AND" logic.
    
VII.  TRANSMITTERS
    
A.    Must meet original manufacturer's specifications.
B.    All RF shielding must be in place.
C.    Must have a visual indicator of transmitter operation.
D.    Must be tagged with CROWN's name, equipment model number, serial number,
      and operating frequency(ies).
E.    All low-level, pre-driver and driver stages in exciter must be shielded.
F.    All power amplifiers must be shielded.
G.    Output power may not exceed that specified on CROWN's FCC License.

VIII. COMBINERS/MULTICOUPLERS
      
A.    Shall at all times meet manufacturer's specifications.
B.    Must be tuned using manufacturer approval procedures.
C.    Must provide a minimum of 60 Db transmitter to transmitter isolation.
     
IX.   CABINETS

A.    All cabinets must be bonded together and to the equipment building ground
      system.
B.    All doors must be secured.
C.    All non-original holes larger than 1" must be covered with copper screen
      or solid metal plates.
D.    Current license for all operating frequencies should be mounted on the
      cabinet exterior for display at all times.
      
X.    INSTALLATION PROCEDURES

A.    Any tower work must be scheduled with BANM using only BANM approved
      contractors at least 48 hours in advance of site work. CROWN will be
      responsible for any and all fees associated with said work.
B.    Installation may take place only after BANM has been notified of the date
      and time in writing, and only during normal working hours unless otherwise
      authorized beforehand.
C.    Equipment may not be operated until final inspection of installation by
      BANM, which shall not be unreasonably withheld.
D.    Any testing periods are to be approved in advance by BANM and within the
      parameters as defined by BANM.
      
XI.   MAINTENANCE/TUNING PROCEDURES

A.    All external indicator lamps/LED's must be working.
B.    Equipment parameters must meet manufacturer's specifications.
C.    All cover, shield and rack fasteners must be in place and securely
      tightened.
D.    Local speakers and/or orderwire systems must be turned off except during
      service, testing or other maintenance operations.
      
XII.  INTERFERENCE DIAGNOSTIC PROCEDURES

      The CROWN must cooperate immediately with BANM when called upon to
      investigate a source of interference, whether or not it can be
      conclusively proven that CROWN's equipment is involved.
      
XIII. TOWER

      This section deals with items which are to be mounted on, attached to
      or affixed to the tower.
      
A.    ICE SHIELDS

      At BANM's sole discretion, protective ice shields may be required and
      manufacturer of ice shield will be determined by BANM.
      
B.    CLIMBING BOLTS AND LADDERS

      All attachments made to the tower shall be made in such a manner as not to
      cause any safety hazard to other users or cause any restriction of
      movement on, or to any climbing ladders, leg step bolts or safety cables
      provided.
      
C.    BRIDGE

1.    Installation of a cable bridge shall be at BANM's sole discretion and
      with BANM's approval.

                                       22
<PAGE>
 
2.    If required, and in accordance with the manufacturer's recommendations
      for the spacing of supports on horizontal runs for the particular type
      of cable or waveguide, the cable or waveguide shall be secured to the
      brackets on the bridge using clamps and hardware specifically
      manufactured for that purpose.
3.    No cable or waveguide run shall be clamped, tied or in any way affixed to
      a run belonging to BANM or any other licensee/lessee.
      
D.    CABLE LADDER AND WAVEGUIDE

1.    CROWN shall install a ladder for the vertical routing of cable and
      waveguide. From the horizontal to vertical transition at the point where
      the bridge meets the tower to the point at which the cable or waveguide
      must leave the bridge to route to the antenna, all cable and waveguide is
      to be attached to the ladder in accordance with the recommendations of the
      manufacturer of the cable or waveguide.
2.    No cable or waveguide run shall be clamped, tied or any way affixed to a
      run belonging to BANM or any other licensee/lessee.
      
E.    DISTRIBUTION RUNS

1.    Cable or waveguide runs from the cable ladder to the point at which they
      connect to the antenna shall be routed alone tower members in a manner
      producing a neat and professional site appearance.
2.    Cable and/or waveguide runs shall be specifically routed so as not to
      impede the safe use of the tower leg or climbing bolts, or to restrict the
      access of BANM or any other licensee/lessee.
3.    Distribution runs shall be clamped to the tower in accordance with the
      recommendations of the manufacturer of the cable or waveguide.
4.    No cable or waveguide run shall be clamped, tied or in any way affixed
      to a run belonging to BANM or any other licensee/lessee.
      
F.    LENGTHS

1.    Cable and/or waveguide runs shall not be longer than necessary to
      provide a proper connection and normal maintenance and operation.
2.    No coiled lengths shall be permitted on the tower, bridge or on the
      ground.
      
G.    ENTRY

1.    Entry of the cable or waveguide to the interior of the shelter shall be
      via ports provided in the shelter wall.
2.    Cable and/or waveguide entering a port shall be provided with a boot to
      seal the port; the boot shall be a Microflect or equivalent commercial
      product made specifically for the type of cable or waveguide and for
      diameter of the entry port, and approved by BANM before installation. It
      shall be installed in accordance with the instructions of the manufacturer
      and the port shall be sealed against the intrusion of moisture.
      
XIV.  EQUIPMENT LOCATED WITHIN BANM'S EQUIPMENT BUILDING

A.    EQUIPMENT INSTALLATION REQUIREMENTS
1.    Any mounting to walls either outside or inside BANM's building must be
      pre-approved by BANM.
2.    All racks and equipment are to be plumb and true with the walls and floor
          of the shelter and reflect an installation consistent with the
          electrical and operational requirements of the equipment and
          appearance standards of a professional installation.
3.    Racks are to be bolted to the floor and aligned on the center line as
      in the site drawing provided to the BANM.
4.    Racks are not to be attached to the cable trays.
      
B.    TRANSMISSION LINES AND/OR WAVEGUIDE ROUTING

1.    Cable trays and/or troughs are required within the shelter for the
      routing of cable and waveguide to the equipment racks and termination
      points.
2.    All cable and waveguide shall be placed and secured to the cable tray.
      
C.    LENGTHS

1.    Cable and/or waveguide runs in the equipment shelter shall not be longer
      than necessary in order to provide a proper connection.
2.    While adequate slack for purposes of maintenance and operation is
      permitted, no coiled lengths on the tray or elsewhere in the shelter are
      permitted for normal maintenance and operation.
      
XV.   GROUNDING

                                       23
<PAGE>
 
1.     CROWN must adhere to other the Motorola or AT&T grounding specification
       outlined above based on BANM's equipment at facility.
2.     All exterior grounding shall be C.A.D. welding.
3.     All antennas shall be bonded to the tower.
4.     Cable and waveguide shall be grounded as a minimum at three specific
       points, and for vertical runs in excess of 200 feet at intermediate
       points.
5.     All cable and waveguide shall be grounded to the tower at the point where
       the run effectively breaks from the tower for its connection to the
       antenna, using clamps and hardware specifically manufactured for that
       purpose.
6.     On the vertical portion of the cable or waveguide run, just above where
       it starts to make its transition from a vertical tower to a horizontal
       bridge run, all cable and waveguide shall be grounded to the tower using
       clamps and hardware specifically manufactured for that purpose.
7.     On the exterior of each shelter, at a point near the entry ports, a
       grounding plate must be provided for terminating ground leads brought
       from the cable and waveguide. Each cable and waveguide run shall be
       grounded at this point using clamps and hardware specifically
       manufactured for that purpose.
8.     On cable and waveguide installations where the vertical tower length
       exceeds 200 feet, the run shall be grounded at equally spaced
       intermediate points along the length of the run so as not to have a
       distance between grounding points longer than 100 feet.
9.     Cable and waveguide grounding leads shall connect to a separate point for
       each run to the common ground point.
10.    Grounding straps shall be kept to a minimum length and as near as
       possible to vertical down lead and shall be consistent with the
       restraints of protective dress and access.
11.    Grounding plates must be provided for single point access to the site
       grounding system. Each rack shall have a proper sized, insulated ground
       lead from the rack safety and signal grounds to one of the grounding
       points on the ground plate.
12.    The insulated ground lead shall follow the route of and be placed in the
       cable tray.
13.    Each rack shall be separately grounded.
14.    All modifications to grounding system must meet BANM's impedance
       specification.
       
XVI.   ELECTRICAL
       
1.     Power requirements must be approved, in advance by BANM.
2.     Polarized electrical outlets should be installed for all transmitters
       when possible.
3.     Surge protection is required for all base stations.
       
XVII.  ELECTRICAL DISTRIBUTION
      
       All electrical wiring from the distribution breaker panel shall be via
       rigid metal conduit, thin wall, routed along the underside of the cable
       tray to a point directly above the equipment rack. From this point, CROWN
       may select how to distribute to its equipment or rack.
      
XVIII. TEMPORARY LOADS

I.     Test equipment, soldering irons or other equipment serving a test or
       repair function may be used only if the total load connected to any
       single dual receptacle does not exceed 15 amps.
2.     Test equipment to be in place for more than seven (7) days will require
       prior approval of the BANM.

XIX.   HEATING, VENTILATING, AND AIR CONDITIONING

       Any additional equipment or equipment upgrade having a greater heat
       dissipation requirement than the existing system will be the
       responsibility of CROWN and if different than specified in the
       Application cannot be installed without the prior approval of the BANM.

XX.    DOORS

       Equipment building doors shall be kept closed at all times unless when
       actually moving equipment in or out.

XXI.   SITE APPEARANCE

1.     Services to maintain the appearance and integrity of the site will be
       provided by the BANM and will include scheduled cleaning of the shelter
       interiors.
2.     Each licensee/lessee is expected and required to remove from the site all
       trash, dirt and other materials brought into the shelter, or onto the
       site during their installation and maintenance efforts.
3.     No food or drink is allowed within the equipment shelter.
4.     No smoking is allowed on the tower site.

XXII.  STORAGE

                                       24
<PAGE>
 
       No parts or material may be stored on site by CROWN.

XXIII. DAMAGE
       CROWN shall report to BANM any damage to any item of the facility,
       structure, component or equipment, whether or not caused by CROWN.

XXIV.  REPORTING ON SITE
1.     Personnel on site shall be required to communicate with the Network
       Operating Center by calling 1-800-852-2671 and report their arrival on
       site, identify, purpose, expected and actual departure times.
2.     Emergency 24 hour contact number(s) must be displayed on outside of
       equipment cabinet/building.

                                       25
<PAGE>
 
                           Exhibit "E" to the Master

               RESTRICTED COUNTIES WITHIN PITTSBURGH SUPERSYSTEM


PITTSBURGH MSA     STEUBENVILLE MSA  WEST VIRGINIA 6    PENNSYLVANIA 2  
- --------------     ----------------  ---------------    --------------
Allegheny          Carroll           Boone              Cameron 
Beaver             Jefferson         Lincoln            Elk 
Washington         Brooke            Logan              Mc Kean 
Westmoreland       Hancock           Mc Dowell              
                                     Mingo     
                                     Wyoming  
               
OHIO 7             WEST VIRGINIA 7   PENNSYLVANIA 6.2   OHIO 10  
- ------             ---------------   ----------------   -------        
Guernsey           Fayette           Armstrong          Athens
Harrison           Greenbrier        Butler             Meigs 
Monroe             Mercer                               Morgan 
Noble              Monroe                               Vinton 
Tuscarawas         Raleigh   
                   Summers  
               
PENNSYLVANIA 7     ALTOONA MSA       PENNSYLVANIA 9     JOHNSTOWN MSA  
- --------------     -----------       --------------     -------------
Clearfield         Blair             Fayette            Cambria 
Indiana                              Greene             Somerset
Jefferson  

PENNSYLVANIA 11.2  CHARLESTON MSA    WEST VIRGINIA 1    HUNTINGTON MSA
- -----------------  --------------    ---------------    --------------
Huntingdon         Kanawha           Calhoun            Boyd 
Mifflin            Patman            Jackson            Carter     
                                     Mason              Greenup 
                                     Roane              Lawrence
                                                        Cabell 
                                                        Wayne  

WEST VIRGINIA 2    WHEELING MSA  
- ---------------    ------------
Doddridge          Belmont 
Gilmer             Marshall 
Lewis              Ohio 
Ritchie 
Tyler 
Wetzel

                                      26
<PAGE>
 
                           EXHIBIT "F" to the Master


                         MASTER LEASE PRICING MATRIX
A.   Antennas                                
     --------
[*] (Tower mounted with one (1) associated coaxial cable per antenna).

[*] (To be mounted 50'or lower on tower or along ice bridge.)

Plastic satellite receive dish (4' diameter or less).
Mounted @ 50'or lower: [*]
Mounted @ 50'or above: Rate schedule below applies. May be permanently mounted
on CROWN's equipment shelter roof at no charge.


B.   Microwave/Satellite Dish
     ------------------------

Size                          Monthly Rental      Annual Rental
- ----                          --------------      -------------
2' (incl. .75 meter)              [*]                 [*] 
4'                                [*]                 [*] 
6'                                [*]                 [*] 
8'                                [*]                 [*] 
10'                               [*]                 [*] 
Ground Mounted                    [*]                 [*] 
                              

C.   Buildings/Equipment Shelters
     ----------------------------

Size                          Monthly Rental      Annual Rental
- ----                          --------------      -------------
Up to 360 sq. ft.                [*]                 [*] 
361 to 420 sq. ft.               [*]                 [*] 
421 to 560 sq. ft.               [*]                 [*] 
BANM must approve placement on site plan before installation by CROWN.

D.   Internal Building/Shelter Space
     -------------------------------
[*]/annually. BANM has the sole right to determine if space is available.

E.   Temporary Installations (e.g. Generator Room)
     --------------------------------------------

During the period of time when CROWN is acquiring local governmental approvals,
CROWN shall be allowed, with prior written consent from BANM, to install one (1)
radio base station cabinet (not to exceed 2' x 3' x 6') in BANM's generator room
(if available) for a period not to exceed six (6) months. CROWN may extend for
one (1) additional six (6) month period in the event that CROWN's local
governmental approvals have not been granted and provided CROWN obtains written
approval in advance from BANM. However, CROWN will remove its radio base
station cabinet immediately upon the completion of the CROWN equipment building.

The monthly rental under this temporary occupancy provision shall be equal to
the monthly rental of the completed facility as set forth in item "C" above.
CROWN will pay for electrical services as outlined below.

     Utilities
     ---------

     In all cases except temporary installations in generator rooms, electrical
service is the responsibility of CROWN. When temporary installation is permitted
inside the generator room, CROWN shall pay BANM [*] per month for
electrical service in addition to the monthly rental as outlined earlier.

     Emergency Generators
     --------------------

???? emergency generators must be fully contained inside CROWN's equipment
building. Permanent outside installations are not permitted. With written
approval from BANM, CROWN may connect to BANM's generator on those limited sites
where CROWN is required to provide an alternate power source. All installation
costs are the responsibility of CROWN. Installation must be performed to BANM
standards. Approval is contingent upon BANM having excess capacity on its
generator. Monthly fee of [*] applies.


____________________________
     /1/   All dishes heights will be at the minimum height requirement per
Comsearch frequency coordination to insure quality service and reliability
and reduce tower loading. 

All microwave dishes larger than 2' must contain a radome cover.

All grid dishes must contain operational de-icers.

[*] Indicates where text has been omitted pursuant to a request for confidential
treatment. The omitted text has been filed with the Securities and Exchange 
Commission separately.
<PAGE>
<TABLE>
<S>                                                             <C>
  
                       [LOGO]  CERTIFICATE OF INSURANCE                                     ISSUE DATE (MM/DD/YY)
                                                                                                  12-19-95

PRODUCER                                                        --------------------------------------------------------------------
                                                                THIS CERTIFICATE IS ISSUED AS A MATTER OF INFORMATION ONLY AND 
                                                                CONFERS NO RIGHTS UPON THE CERTIFICATE HOLDER. THIS CERTIFICATE
                                                                DOES NOT AMEND. EXTEND OR ALTER THE COVERAGE AFFORDED BY THE 
                                                                POLICIES BELOW.
                                                                --------------------------------------------------------------------
                                           
                                                                              COMPANIES AFFORDING COVERAGE

                                                                COMPANY
                                                                LETTER    A        Insurance Carrier

                                                                COMPANY
                                                                LETTER    B
INSURED
                                                                COMPANY
                                                                LETTER    C
     "Tenant and/or Subcontractor"
                                                                COMPANY
                                                                LETTER    D

                                                                COMPANY
                                                                LETTER    E

- ------------------------------------------------------------------------------------------------------------------------------------
 COVERAGES   
   THIS IS TO CERTIFY THAT THE POLICIES OF INSURANCE LISTED BELOW HAVE BEEN ISSUED TO THE INSURED NAMED ABOVE FOR THE POLICY
   PERIOD INDICATED, NOTWITHSTANDING ANY REQUIREMENT, TERM OR CONDITION OF ANY CONTRACT OR OTHER DOCUMENT WITH RESPECT TO WHICH
   THIS CERTIFICATE MAY BE ISSUED OR MAY PERTAIN. THE INSURANCE AFFORDED BY THE POLICIES DESCRIBED HEREIN IN SUBJECT TO ALL THE
   TERMS, EXCLUSIONS AND CONDITIONS OF SUCH POLICIES. LIMITS SHOWN MAY HAVE BEEN REDUCED BY PAID CLAIMS.

 CO                                                   POLICY EFFECTIVE    POLICY EXPIRATION
LTR       TYPE OF INSURANCE      POLICY NUMBER         DATE (MM/DD/YY)     DATE (MM/DD/YY)                   LIMITS
- ------------------------------------------------------------------------------------------------------------------------------------
    GENERAL LIABILITY                                                                       GENERAL AGGREGATE            $ 2,000,000
A                                                                                           ----------------------------------------
    X  COMMERCIAL GENERAL LIABILITY                                                         PRODUCTS-COMP/OP AGG.        $ 2,000,000
          CLAIMS MADE X OCCUR.                         01/01/96          01/01/97           ----------------------------------------
                                                                                            PERSONAL & ADV. INJURY       $ 1,000,000
       OWNER'S & CONTRACTOR'S PROT.                                                         ----------------------------------------
    X  Independent Contr.                                                                   EACH OCCURRENCE              $ 1,000,000
                                                                                            ----------------------------------------
                                                                                            FIRE DAMAGE (Any one fire)   $    50,000
                                                                                            ----------------------------------------
                                                                                            MED. EXPENSE(Any one person) $     5,000
- -----------------------------------------------------------------------------------------------------------------------------------
    AUTOMOBILE LIABILITY                                                                    COMBINED SINGLE              $
A   X  ANY AUTO                                        01/01/96           01/01/97          LIMIT                        $ 1,000,000
       ALL OWNED AUTOS  
       SCHEDULED AUTOS                                                                      BODILY INJURY
       HIRED AUTOS                                                                          (Per person)                 $ 
       NON-OWNED AUTOS
       GARAGE LIABILITY                                                                     PROPERTY DAMAGE              $
- ------------------------------------------------------------------------------------------------------------------------------------
    EXCESS LIABILITY                                                                        EACH OCCURRENCE              $ 5,000,000
A   X  UMBRELLA FORM                                   01/01/96           01/01/97          AGGREGATE                    $ 5,000,000
       OTHER THAN UMBRELLA FORM
- ------------------------------------------------------------------------------------------------------------------------------------
A   WORKER'S COMPENSATION                                                                   X  STATUTORY LIMITS
         AND                                           01/01/96           01/01/97          EACH ACCIDENT                $ 1,000,000
    EMPLOYERS' LIABILITY                                                                    ----------------------------------------
                                                                                            DISEASE-POLICY LIMIT         $ 1,000,000
                                                                                            ----------------------------------------
                                                                                            DISEASE-EACH EMPLOYEE        $ 1,000,000
- ------------------------------------------------------------------------------------------------------------------------------------
    OTHER
A   All Risk Property Ins.
    (Equipment & Tools)                                01/01/96          01/01/97           Full Replacement Value
    Auto Physical Damage
- ------------------------------------------------------------------------------------------------------------------------------------
  DESCRIPTION OF OPERATIONS/LOCATIONS/VEHICLES/SPECIAL ITEMS
    Bell Atlantic NYNEX Mobile,. Pittsburgh SMSA L.P. & PA RSA 6 (II), CellCo Partnership and all subsidiary companies and any 
    applicable landlord & affiliates are added as Additional Insured on the General Liability, Auto Liability & Excess Liability
    policies indicated above as respects any and all work performed at any location.
- ------------------------------------------------------------------------------------------------------------------------------------
  CERTIFICATE HOLDER                                            CANCELLATION
     
    Cellco Partnership                                          SHOULD ANY OF THE ABOVE DESCRIBED POLICIES BE CANCELLED BEFORE
    D/B/A/ Bell Atlantic Mobile NYNEX Mobile                    THE EXPIRATION DATE THEREOF, THE ISSUING COMPANY WILL 
    201 Bursca Drive                                            ENDEAVOR TO MAIL 30 DAYS WRITTEN NOTICE TO THE CERTIFICATE
    Bridgeville, PA 15017                                       HOLDER NAMED TO THE LEFT, BUT FAILURE TO MAIL SUCH NOTICE 
                                                                SHALL IMPOSE NO OBLIGATION OR LIABILITY OF ANY KIND UPON
    Attn: Herb Hungerman                                        THE COMPANY, ITS AGENTS OR REPRESENTATIVES.
                                                                --------------------------------------------------------------------
                                                                 AUTHORIZED REPRRESENTATIVE
          Certificate #:[    1063]

 ACORD 25-S (7/90)                                                                                              (C) ACORD CORPORATE
 --------------------------------------------------------  28  ---------------------------------------------------------------------
                                      
</TABLE>

<PAGE>
 
<TABLE> 
                                                                ISSUE DATE (MM/DD/YY)                  
                                                                                                       
      ACORD.   CERTIFICATE OF INSURANCE                                                                
                                                                        12-19-95                       
                                                                                                       
                              -------------------------------------------------------                  
PRODUCER                      THIS CERTIFICATE IS ISSUED AS A MATTER OF INFORMATION                    
                              ONLY AND CONFERS NO RIGHTS UPON THE CERTIFICATE HOLDER.                  
                              THIS CERTIFICATE DOES NOT AMEND, EXTEND OR ALTER THE                     
                              COVERAGE AFFORDED BY THE POLICIES BELOW.                                 
                              -------------------------------------------------------                  

                                          COMPANIES AFFORDING COVERAGE                                 
<S>                           <C>                                                                          
                              COMPANY A  Insurance Carrier                                             
                              LETTER                                                                   
                                                                                                       
                              COMPANY B                                                                
                              LETTER                                                                   
                                                                                                       
INSURED

      Crown Communications    COMPANY C                                                                
      Penn Center West III    LETTER                                                                   
      Suite 229                                                                                        
      Pittsburgh, PA          COMPANY D                                                                
                              LETTER                                                                   
                                                                                                       
                              COMPANY E                                                                
                              LETTER                                                                    
</TABLE> 

<TABLE> 
<CAPTION> 
- -----------------------------------------------------------------------------------------------------------------------------
COVERAGES

 THIS IS TO CERTIFY THAT THE POLICIES OF INSURANCE LISTED BELOW HAVE BEEN ISSUED
 TO THE INSURED NAMED ABOVE FOR THE POLICY PERIOD INDICATED. NOTWITHSTANDING ANY
 REQUIREMENT, TERM OR CONDITION OF ANY CONTRACT OR OTHER DOCUMENT WITH RESPECT
 TO WHICH THIS CERTIFICATE MAY BE ISSUED OR MAY PERTAIN, THE INSURANCE AFFORDED
 BY THE POLICIES DESCRIBED HEREIN IS SUBJECT TO ALL THE TERMS, EXCLUSIONS AND
 CONDITIONS OF SUCH POLICIES. LIMITS SHOWN MAY HAVE BEEN REDUCED BY PAID CLAIMS.

co     TYPE OF INSURANCE     POLICY NUMBER  POLICY EFFECTIVE    POLICY EXPIRATION                   LIMITS
LTR                                          DATE (MM/DD/YY)      DATE (MM/DD/YY)           
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                          <C>                 <C>              <C>                             <C>         
 GENERAL LIABILITY                                                                GENERAL AGGREGATE  -            $  2,000,000 
A                                                                                                                             
 X   COMMERCIAL GENERAL LIABILITY                                                 PRODUCTS-COMP/OP AGG.           $  2,000,O00  
                                             01/01/96            01/01/97                                                     
       CLAIMS MADE   x OCCUR                                                      PERSONAL & ADV. INJURY          $  1,000,000
      OWNER'S & CONTRACTOR'S PROT.                                                EACH OCCURRENCE                 $  1,000,000 
   x   Independent Contr.                                                         FIRE DAMAGE (Any one fire)      $     50,000 
                                                                                  MED. EXPENSE (Any -one person          5,000 
- -----------------------------------------------------------------------------------------------------------------------------
 AUTOMOBILE LIABILITY                                                             
A                                                                                 COMBINED SINGLE            $  1,000,000    
 X    ANY AUTO                               01/01/96            01/01/97         LIMIT     
     ALL OWNED AUTOS                                                              BODILY INJURY    

     SCHEDULED AUTOS                                                              (Per person)               $
     HIRED AUTOS                                                                  BODILY INJURY              
                                                                                  (Per accident)             $ 
     NON-OWNED AUTOS           
     GARAGE LIABILITY                                                             PROPERTY DAMAGE            $
- -----------------------------------------------------------------------------------------------------------------------------
 EXCESS LIABILITY                                                                 EACH OCCURRENCE            $ 10,000,000    
A 
 x   UMBRELLA FORM                           01/01/96            01/0/97          AGGREGATE                  $ 10,000,000    
     OTHER THAN UMBRELLA FORM
- -----------------------------------------------------------------------------------------------------------------------------
A    WORKER'S COMPENSATION                   01/01/96            01/01/97         X  STATUTORY LIMITS    
             AND                                                                  EACH ACCIDENT              $  1,000,000    
     EMPLOYERS' LIABILITY                                                         DISEASE-POLICY LIMIT       $  1,000,000
                                                                                  DISEASE-EACH EMPLOYEE      $  1,000,000 
- -----------------------------------------------------------------------------------------------------------------------------
  OTHER
                                                                                  Full Replacement Value   
A All Risk Property Ins.                     01/01/96            01/01/97
  (Equipment & Tools)
  Auto Physical Damage
- -----------------------------------------------------------------------------------------------------------------------------
DESCRIPTION OF OPERATIONS/LOCATIONS/VEHICLES/SPECIAL ITEMS

     Bell Atlantic NYNEX Mobile, Pittsburgh SMSA L.P. & PA RSA 6 (II), CellCo
     Partnership and all subsidiary companies and any applicable landlord &
     affiliates are added as Additional Insured on the General Liability, Auto
     Liability & Excess Liability policies indicated above as respects any and
     all work performed at any location.
- -----------------------------------------------------------------------------------------------------------------------------
CERTIFICATE HOLDER                      CANCELLATION

                                             SHOULD ANY OF THE ABOVE DESCRIBED POLICIES BE CANCELLED BEFORE THE
  Cellco Partnership                         EXPIRATION DATE THEREOF, THE ISSUING COMPANY WILL ENDEAVOR TO
  D/B/A Bell Atlantic Mobile NYNEX Mobile    MAIL 30 DAYS WRITTEN NOTICE TO THE CERTIFICATE HOLDER NAMED TO THE
  201 Bursca Drive                           LEFT, BUT FAILURE TO MAIL SUCH NOTICE SHALL IMPOSE NO OBLIGATION OR
  Bridgeville, PA '-5017                     LIABILITY OF ANY KIND UPON THE COMPANY. ITS AGENTS OR REPRESENTATIVES.
                                             --------------------------------------------------------------------------------
  Attn:Herb Huncerman                        AUTHORIZED REPRESENTATIVE

  Certificate #:[????63]

ACORD 25-S (7/90)                                                                              CACORD CORPORATION 1990
- -------------------------------------------------     29     ----------------------------------------------------------------
</TABLE> 


<PAGE>
 
                       CROWN CASTLE INTERNATIONAL CORP.

                            1995 STOCK OPTION PLAN

                              (THIRD RESTATEMENT)
<PAGE>
 
                       CROWN CASTLE INTERNATIONAL CORP.

                  1995 STOCK OPTION PLAN (THIRD RESTATEMENT)

                               Table of Contents

                                                                            Page
                                                                            ----

1.     Purpose..............................................................  1
2.     Administration of the Plan...........................................  1
3.     Shares Subject to the Plan...........................................  1
4.     Participation in the Plan............................................  1
5.     Terms of Options.....................................................  2
6.     Option Price.........................................................  2
7.     Acceleration of Otherwise Unexercisable Options on Termination of
       Employment or Death..................................................  2
8.     Number of Options Granted............................................  2
9.     Notice to Exercise Options...........................................  2
10.    Payment for Stock....................................................  3
11.    Grants of Options and Stock Option Agreement.........................  3
12.    Use of Proceeds......................................................  3
13.    Non-Transferability of Options.......................................  3
14.    Determination of Fair Market Value...................................  3
15.    Adjustments Upon Changes in Capitalization...........................  3
16.    Amendment and Termination of the Plan................................  3
17.    Effective Date.......................................................  4
18.    Securities Law Requirements..........................................  4
19.    Additional Documents on Death of Participant.........................  4
20.    Changes in Duties....................................................  4
21.    Employment...........................................................  4
22.    Stockholder Rights...................................................  4
23.    Payment of Withholding Taxes.........................................  4
24.    Assumption of Outstanding Options....................................  4

                                       i
<PAGE>
 
25.    Severability.........................................................  5
26.    Affiliate............................................................  5

                                      ii
<PAGE>
 
                       CROWN CASTLE INTERNATIONAL CORP.

                  1995 STOCK OPTION PLAN (THIRD RESTATEMENT)


      1.  Purpose.  The purpose of the CROWN CASTLE INTERNATIONAL CORP. 1995
STOCK OPTION PLAN ("Plan") shall be to attract, retain and motivate key
employees, consultants and directors ("Participants") of Crown Castle
International Corp., a Delaware corporation and previously Castle Tower Holding
Corp. ("Company"), including its subsidiaries and affiliates, by way of granting
non-qualified stock options ("Options"). Options may only be granted to
Participants.  Options to be granted under the Plan are intended to be "non-
qualified stock options" taxable pursuant to Section 83 of the Internal Revenue
Code of 1986, as amended ("Code").

      2.  Administration of the Plan. The Plan shall be administered by the
Board of Directors of the Company ("Board"). However, if the Company becomes a
registrant under Section 12 of the Securities Exchange Act of 1934, as amended
("1934 Act") and so long as required for exemption pursuant to Rule 16b-3 ("Rule
16b-3") promulgated by the Securities Exchange Commission pursuant to Section 16
of the 1934 Act, the Plan shall be administered by the Management Development
and Compensation Committee ("Committee") appointed by the Board and consisting
of not less than two members from the Board.  The members of the Committee shall
serve at the pleasure of the Board and shall be ineligible to participate under
the Plan.  No Director may become a member of the Committee who, during the one
year prior to appointment to the Committee, was granted or awarded equity
securities pursuant to the Plan or any other plan of the Company entitling
Participants therein to acquire stock, stock options or stock appreciation
rights. The Board or Committee, as applicable, administrating the Plan is
hereinafter referred to as the "Administrator".  The Administrator shall have
the power, where consistent with the general purpose and intent of the Plan, to
(i) modify the requirements of the Plan to conform with the law or to meet
special circumstances not anticipated or covered in the Plan, (ii) establish
policies, and (iii) adopt rules and regulations and prescribe forms for carrying
out the purposes and provisions of the Plan, including the form of any stock
option agreement ("Stock Option Agreement").  Unless otherwise provided in the
Plan, the Administrator shall have the authority to interpret and construe the
Plan, and determine all questions arising under the Plan and any agreement made
pursuant to the Plan.  Any interpretation, decision or determination made by the
Administrator shall be final, binding and conclusive.  A majority of the
Administrator shall constitute a quorum, and an act of the majority of the
members present at any meeting at which a quorum is present shall be the act of
the Administrator.  The Board shall make all decisions with respect to the
termination, suspension or discontinuance of the Plan.

      3.  Shares Subject to the Plan.  Shares of stock ("Stock") covered by
Options shall consist of One Million One Hundred Fifty Three Thousand
(1,153,000) shares of the voting Class B common stock of the Company ("Class B
Stock").  Either authorized and unissued shares or treasury shares may be
delivered pursuant to the Plan.  If any Option for shares of Stock granted to a
Participant lapses, or is otherwise terminated, the Administrator may grant
Options for such shares of Stock to other Participants.

      4.  Participation in the Plan.  The Administrator shall determine from
time to time those Participants who are to be granted Options and the number of
shares of Stock covered thereby provided that all Participants shall be
employees, consultants or directors of the Company including a subsidiary or
affiliate.

      5.  Terms of Options.  Options shall be granted by the Administrator on
the following terms and conditions described below and any other terms and
conditions not inconsistent with such terms and conditions including, without
limitation, a requirement that 
<PAGE>
 
the Stock is subject to the restrictions and terms of a stockholder agreement.
Except as specifically provided in Section 7 hereof, with regard to the death of
a Participant, no option shall be exercisable more than ten (10) years after the
date of grant. Subject to such limitation, the Administrator shall have the
discretion to fix the period (the "Option Period") during which any Option may
be exercised. Options shall be exercisable only by the Participant while he or
she is an employee, director or consultant of or to the Company (including a
subsidiary or affiliates) except that (A) (i) any such Option granted and which
is otherwise exercisable, may be exercised by the personal representative of a
deceased Participant within 12 months after the death of such Participant and
(ii) if a Participant terminates his employment with the Company, such
Participant may exercise any Option which is otherwise exercisable at any time
within three (3) months of such date of termination or (B) the Stock Option
Agreement specifically states that the option is otherwise exercisable. If a
Participant should die during the applicable three-month period following the
date of such participant's termination, the rights of the personal
representative of such deceased Participant as such relate to any Options
granted to such deceased Participant shall be governed in accordance with clause
(i) of the immediately preceding sentence. Termination of employment means the
Participant is no longer an employee, director or consultant with or to the
Company (including any subsidiary or affiliate of the Company).

      6.  Option Price.  The option price ("Option Price") for shares of Stock
subject to Stock Options shall be determined by the Administrator and may be
less than, equal to, or greater than the fair market value of the Stock, but in
no event shall such Option Price be less than the par value of the Stock.

      7.  Acceleration of Otherwise Unexercisable Options on Termination of
Employment or Death.  The Administrator, in its sole discretion, may permit (i)
a Participant who terminates employment with the Company or (ii) the personal
representative of a deceased Participant, to exercise and purchase (within three
(3) months of such date of termination of employment or 12 months in the case of
a deceased Participant) all or any part of the shares subject to Option on the
date of the Participant's death or termination, notwithstanding that all
installments, if any, with respect to such Option, had not accrued or vested on
such date.

      8.  Number of Options Granted.  Participants may be granted more than one
Option.  In making any such determination, the Administrator shall obtain the
advice and recommendation of the officers of the Company which have supervisory
authority over such Participants.  The granting of a Option under the Plan shall
not affect any outstanding Option previously granted to a Participant under the
Plan.

      9.  Notice to Exercise Options.  Upon exercise of an Option, a Participant
shall give written notice to the Secretary of the Company, or other officer
designated by the Administrator, at the Company's main office which is currently
in Houston, Texas.

      10. Payment for Stock.  Payment for shares of Stock purchased under the
Plan shall be made in full and in cash or check made payable to the Company.
Payment for shares of Stock purchased under this Plan may also be made in Class
B Stock or a combination of cash and Class B Stock.  In the event that Class B
Stock is utilized in consideration for the purchase of Stock upon the exercise
of an Option, then such Class B Stock shall be valued at the "fair market value"
as defined in Section 14 of the Plan.  For all purposes of effecting the
exercise of an Option, the date on which the Participant gives the notice of
exercise to the Company will be the date he becomes bound contractually to take
and pay for the shares of Stock underlying the Option.

      11. Grants of Options and Stock Option Agreement.  Each Option granted
under this Plan shall be evidenced by the minutes of a meeting of the
Administrator or by 


                                       2
<PAGE>
 
the written consent of the Administrator, and by a written Stock Option
Agreement effective on the date of grant and executed by the Company and the
Participant. Each Option granted hereunder shall contain such terms,
restrictions and conditions as the Administrator may determine, which terms,
restrictions and conditions may or may not be the same in each case.

      12. Use of Proceeds.  The proceeds received by the Company from the sale
of Stock pursuant to the exercise of Options granted under the Plan shall be
added to the Company's general funds and used for general corporate purposes.

      13. Non-Transferability of Options.  Except as otherwise herein provided,
any Option granted shall not be transferable otherwise than by will or the laws
of descent and distribution or pursuant to a qualified domestic relations order
as defined by the Code, or Title I of the Employee Retirement Income Security
Act of 1974, as amended, or the rules thereunder.  The Option may be exercised,
during the lifetime of the Participant, only by the Participant.  More
particularly (but without limiting the generality of the foregoing), the Option
may not be assigned, transferred (except as provided above), pledged or
hypothecated in any way, shall not be assignable by operation of law and shall
not be subject to execution, attachment or similar process.  Any attempted
assignment, transfer, pledge, hypothecation or other disposition of the Option
contrary to the provisions hereof shall be null and void and without effect.

      14. Determination of Fair Market Value.  As used in the Plan, "fair market
value" shall mean the prices of the Class B Stock as determined by the
Administrator as of the granting date, exercise date or other relevant date.

      15. Adjustments Upon Changes in Capitalization.  The aggregate number of
shares of Stock under Options granted under the Plan, the Option Price and the
total number of shares of Stock which may be purchased by a Participant on
exercise of an Option shall be appropriately adjusted by the Administrator to
reflect any recapitalization, stock split, stock dividend or similar transaction
involving the Class B Stock or the Company.

      16. Amendment and Termination of the Plan.  The Plan shall terminate on
July 31, 2005, but prior thereto may be altered, changed, modified, amended or
terminated by written amendment approved by the Board.  However, that no action
of the Board may, without the approval of the shareholders, materially increase
the benefits accruing to Participants under the Plan, increase the aggregate
number of shares of Stock which may be purchased under Options granted under the
Plan; withdraw the administration of the Plan from the Committee (if
applicable); permit a Director to be a member of the Committee (if applicable),
if he has participated for the year preceding his appointment in the Plan or any
similar plan; permit any person while a member of the Committee (if applicable)
to be eligible to receive an Option under the Plan; amend or alter the Option
Price; or amend the Plan in any manner which would impair the applicability of
Rule 16b-3 to the Plan.  Except as provided in this Article I, no amendment,
modification or termination of the Plan shall in any manner adversely affect any
Option theretofore granted under the Plan without the consent of the affected
Participant.

      17. Effective Date.  The Plan shall become effective upon approval by the
holders of a majority of the voting stock of the Company present, or
represented, and entitled to vote at a meeting called for such purpose.

      18. Securities Law Requirements.  The Company shall have no liability to
issue any Stock hereunder unless the issuance of such shares would comply with
any applicable federal or state securities laws or any other applicable law or
regulations thereunder.


                                       3
<PAGE>
 
      19. Additional Documents on Death of Participant.  No transfer of an
Option by the Participant by will or the laws of descent and distribution shall
be effective to bind the Company unless the Company shall have been furnished
with written notice and an probated copy of the will and/or such other evidence
as the Administrator may deem necessary to establish the validity of the
transfer and the acceptance of the successor to the Option of the terms and
conditions of such Option.

      20. Changes in Duties.  So long as a Participant shall be an employee,
director or consultant of the Company including a subsidiary or affiliate, any
Option granted to the Participant shall not be affected by any change of duties
or position.

      21. Employment.  Nothing in the Plan or in any Stock Option Agreement
which relates to the Plan shall confer upon any Participant any right to
continue in the employ of the Company or any of its subsidiaries or affiliates,
or interfere in any way with the right of the Company, including its affiliates
and subsidiaries, to terminate his employment.  Upon termination of employment,
the Stock Option Agreement may provide for the termination of the unvested
portion of such Option or subject the Option to certain purchase or redemption
rights.

      22. Stockholder Rights.  No Participant shall have a right as a
stockholder with respect to any shares of Stock subject to an Option prior to
the purchase of such shares of Stock by exercise of the Option.

      23. Payment of Withholding Taxes.  Upon the exercise of any Option as
provided herein, no Stock shall be issued to any Participant, until the Company
receives full payment for the Stock purchased, which shall include any required
state and federal withholding taxes.

      24. Assumption of Outstanding Options.  A Stock Option Agreement may
provide that any successor to the Company, including an affiliate or subsidiary,
succeeding to, or assigned the business of, the Company, including an affiliate
or subsidiary as the result of or in connection with a corporate merger,
consolidation, combination, reorganization, liquidation or other corporate
transaction shall assume any Options outstanding under the Plan or issue new
Options in place of outstanding Options under the Plan with such assumption to
be made on a fair and equivalent basis.

      25. Severability.  If any provision of the Plan or a Stock Option
Agreement, or the application of such provision to any person or circumstance,
shall be held invalid, the remainder to the Plan or a Stock Option Agreement or
the application of such provision to person or circumstances other than those to
which it is held invalid, shall not be affected thereby and shall remain
enforceable.

      26. Affiliate.  A subsidiary or affiliate of the Company means any
corporation or entity (other than the Company) in an unbroken chain of
corporations or entities beginning or ending with the Company, as applicable,
if, at the time of such determination, each of the corporations or entities
other than the last corporation or entity (including the Company, if applicable)
in the unbroken chain owns stock or other equity interest possessing 50% or more
of the total combined voting power of all classes of stock in one of the other
corporations or entities in such chain.


                                       4

<PAGE>
 
                                                                   EXHIBIT 10.22

Private & Confidential
 



                            DATED February 28, 1997
                      -----------------------------------


                       CASTLE TRANSMISSION SERVICES LTD.           (1)

                                      and

                          CASTLE TOWER HOLDING CORP.               (2)

                                        

                      -----------------------------------
                         
                              SERVICES AGREEMENT

                      -----------------------------------





                                  Norton Rose
                                    London
<PAGE>
 
THIS SERVICES AGREEMENT is dated 28th day of February 1997 and is made BETWEEN:

(1)  CASTLE TRANSMISSION SERVICES LTD. (No. 3196207) whose registered office is
     at Warwick Technology Park, Heathcote Lane, Warwick CV34 5DS ("the
     Company")

(2)  CASTLE TOWER HOLDING CORP. of 510 Bering Drive, Suite 310, Houston, Texas
     TX 77057 ("the Contractor").

WHEREAS:

(A)  This Agreement sets out the terms on which the Contractor has agreed to
     provide certain services to the Company.

(B)  Without limiting the rights of the Company under this Agreement, it is the
     current intention of the parties hereto that this Agreement shall continue
     for a period of five years which period shall begin on the Commencement
     Date.

NOW IT IS HEREBY AGREED AS FOLLOWS:
- -----------------------------------
<TABLE>
<CAPTION>
 
<S>  <C>
1    Definitions
     -----------
</TABLE>
In this Agreement, unless the contract otherwise requires:

<TABLE>
<CAPTION>
"Agreement"                           means this  agreement including all its appendices;
<S>                                   <C>
"Commencement Date"                   means 28 February 1997
"Contract Year"                       means the period of 12 months commencing on the
                                      Commencement Date and each successive period of 12
                                      months thereafter;
"Contractor Default"                  means any material or persistent breach or
                                      persistent non-performance by the Contractor of the
                                      terms on which the Contractor is to provide the
                                      services pursuant to the provisions of this
                                      Agreement which, if capable of remedy, is not
                                      remedied 45 days after receiving written notice from
                                      the Company requiring the Contractor so to do;
"Contractor's Materials"              means any property of the Contractor (other than the
                                      New Material) including without limitation any know
                                      how, materials, products and methodologies
                                      proprietary to the Contractor;
</TABLE>

                                       1
<PAGE>
 


"Group"                    means, in relation to a company, its subsidiaries,
                           holding companies and any subsidiaries of any such
                           holding companies ("holding companies" and
                           "subsidiary" having ascribed thereto the meanings
                           respectively attributed to them by section 736
                           Companies Act 1985 (as amended));
                         
"Initial Period"           means the period commencing on the Commencement Date
                           and ending on the second anniversary thereof;
                         
"Material Default"         means, in relation to a party to this Agreement,
                           that:
                         
                           (i)       it becomes unlawful for that party to
                                     perform its obligations pursuant to and in
                                     accordance with the provisions of this
                                     Agreement;
                         
                           (ii)      that party takes any action or legal
                                     proceedings are commenced for a general
                                     reconstruction or rescheduling of its debts
                                     (or its equivalent in the jurisdiction of
                                     incorporation of that party) or for its
                                     winding up or dissolution;
                         
                           (iii)     a liquidator, receiver or an administrative
                                     receiver or similar is appointed over the
                                     assets of or a petition is granted for an
                                     administration order (or its equivalent in
                                     the jurisdiction and incorporation of that
                                     party) in respect of that party;
                         
"New Material"             means any works and materials to the extent created,
                           developed, written or prepared by the Contractor
                           solely in relation to the Services;
                         
"Services"                 means services falling within the scope of the
                           categories of services listed in the schedule to this
                           Agreement;

"Yearly Fee"               means the sum of (Pounds)240,000 (subject to
                           adjustment for the fourth and subsequent Contract
                           Years by agreement between the parties) to be paid
                           by the Company to the Contractor in respect of
                           Services provided in the relevant Contract Year.

                                       2
<PAGE>
 
2    Appointment
     -----------

2.1  The Contractor agrees to provide the Services to the Company as may
     reasonably be required by the Company from time to time.

2.2  Without limiting the generality of clause 2.1, the parties acknowledge
     that the Company may request the Contractor to provide services relating
     to training and research and development as described in part B of the
     schedule to this Agreement on a contract basis on commercial arm's length
     terms and conditions (including as to fees) to be separately agreed and
     the parties shall negotiate in good faith with a view to agreeing such
     terms and conditions as soon as practicable after the date of such request
     by the Company.  For the avoidance of doubt, the fees for such services
     shall be in addition to the Yearly Fee.

3    Fees and expenses
     -----------------

3.1  In consideration of the agreement of the Contractor to provide the
     Services, the Company shall (subject to clause 5.1) pay to the Contractor
     the Yearly Fee (together with value added tax thereon, if applicable).

3.2  The Company agrees to reimburse the Contractor for all reasonable out-of-
     pocket expenses (together with any value added tax thereon) incurred by it
     or its employees in connection with the provision of the Services and any
     additional services to be provided pursuant to clause 2.2. Such out-of-
     pocket expenses shall be payable by the Company within 30 days after
     receipt by the Company of the Contractor's invoice in respect of the same.

3.3  The Yearly Fee shall be payable in such manner and at such times as the
     parties may agree and, in the absence of agreement, shall be paid in 12
     equal instalments monthly in arrears.

3.4  Any instalment of the Yearly Fee and any amount in respect of the
     Contractor's reasonable out-of-pocket expenses which is not paid on its due
     date shall bear interest at 2 per cent. per annum above the base rate of
     Barclays Bank PLC from time to time from the due date for payment until
     payment is actually made.

3.5  If this Agreement shall, in accordance with its terms, terminate other than
     on the last day of a Contract Year, the Yearly Fee payable in respect of
     that year shall be apportioned on a time apportionment basis.

4    Other Obligations
     -----------------

4.1  The Contractor shall provide the Services using reasonable skill and care
     and reasonably promptly and to a standard which might reasonably be
     expected of a

                                       3
<PAGE>
 
     person providing services of the type which the Contractor is obliged to
     provide pursuant to the provisions of this Agreement.

4.2  The Company and the Contractor shall liaise together with a view to
     agreeing a rolling schedule of future Services which are likely to be
     required by the Company.

4.3  The Contractor shall in no circumstances be liable for indirect or
     consequential loss (including loss of profits) deriving from the provision
     or failure to provide any Services to the Company.

4.4  The Company acknowledges that the Contractor's Materials shall remain the
     property of the Contractor and that save as provided in clause 4.5, the
     Company shall not acquire any rights or interest in the Contractor's
     Materials under this Agreement.

4.5  The parties agree that any intellectual property which is created solely by
     reason of the provision of the Services shall either belong to the Company
     or shall be licensed on a non-exclusive basis to the Company on a royalty-
     free basis.

5    Annual Review
     -------------

     Not later than three months before the end of the third and each subsequent
     Contract Year, the parties shall discuss in good faith the extent and
     quality of the Services provided during that Contract Year, the extent to
     which the Yearly Fee for that Contract Year represents a fair and equitable
     fee for the provision of those Services and the extent to which the Yearly
     Fee would represent a fair and equitable fee for the provision of those
     Services which are then forecast to be required by the Company during the
     Contract Year next following, all with a view to agreeing a mutually
     acceptable Yearly Fee for the Contract Year next following (but on the
     basis that the Yearly Fee shall not be reduced unless any such reduction is
     justifiable on objective grounds).

6    Term and Termination
     --------------------

6.1  Subject to the rights of the Company under the remaining provisions of this
     clause 6, this Agreement shall continue for the Initial Period and
     thereafter may be terminated by the Company at any time by giving twelve
     months notice in writing to the Contractor save that the Company agrees
     that (subject to and without limiting its rights under the remaining
     provisions of this clause 6), it shall not give notice to terminate this
     Agreement under this clause 6.1 unless the directors for the time being of
     the Company shall in good faith determine that the Services provided by the
     Contractor are not required or are not value-enhancing or that they cease
     to be commercially acceptable or cost effective for the Company. Either
     party may terminate this Agreement by giving twelve months notice in
     writing to the other to expire not earlier than the end of the fifth
     Contract Year.

                                       4
<PAGE>
 
6.2  The Company shall be entitled at any time after the Commencement Date and
     by giving notice in writing to the Contractor to terminate this Agreement
     with six months notice for Contractor Default.

6.3  Either party shall be entitled by giving notice to the other to terminate
     this Agreement with immediate effect if that other party is in Material
     Default.

6.4  Any termination by the Company of or the exercise by the Company of its
     rights to terminate the provisions of this Agreement in accordance with
     this clause 6 shall be without payment of compensation or damages
     whatsoever to the Contractor (but without prejudice to any sums due and
     payable under the terms of this Agreement for Services already provided by
     the Contractor in accordance with the terms of this Agreement).

6.5  It is hereby acknowledged by the parties hereto that the Contractor shall
     be given notification of any further services required by the Company from
     time to time where the services required are of a type which, in the
     opinion of the Company acting in good faith, the Contractor has the know-
     how to so provide so as to give the Contractor the opportunity to tender.
     The Company shall, in good faith, consider any application to tender for
     services made by the Contractor in these circumstances and, in the event
     that such tender is unsuccessful, shall provide the Contractor with a full
     explanation of the reasons therefor.

6.6  No director nominated by the Contractor or any company in its Group nor
     shall the Contractor or any company in its Group be entitled to participate
     in any decision of the Directors of the Company which is expressed in this
     Agreement as being a decision to be made by the Company (provided however
     that the Contractor shall be entitled to participate in any discussions
     leading up to such decisions).

7    Assignment and sub-contracting
     ------------------------------
7.1  Neither party may assign any of its rights under this Agreement without the
     consent of the other, such consent not to be unreasonably withheld.

7.2  The Contractor may not sub-contract or delegate the performance of its
     obligations under this Agreement (save to a company which is a subsidiary
     or holding company of the Contractor, or which is a subsidiary of any such
     holding company).

8    Notices
     -------

8.1  All notices and other communications required or permitted under this
     Agreement shall be in writing and shall be delivered personally, sent by
     air courier (in the case of notices given by a party in one jurisdiction to
     a party in another), first class pre-paid post (in the case of a notice
     given by a party in one jurisdiction to a party in the same jurisdiction),
     telexed or sent by facsimile transmission (and promptly

                                       5
<PAGE>
 
     confirmed by air courier service in the case of notices sent from one
     jurisdiction to another and by first class pre-paid post in the case of
     notices sent by a party in one jurisdiction to another party in the same
     jurisdiction). Any such notice shall be deemed given when so delivered
     personally, telexed or sent by facsimile transmission or air courier or
     first class pre-paid post to the parties at the following addresses (or at
     such other address for a party as shall be specified by like notice):

     the Company: if to the Company, to:
     ------------                       

     the Company at its registered office for the time being
     Attention:  the Managing Director

                                       6
<PAGE>
 
     the Contractor: if to the Contractor, to:
     --------------                           

     Castle Tower Holding Corporation
     510 Bering Drive
     Suite 310
     Houston
     Texas TX 77057
     Attn: Ted B. Miller Jr
     Fax: 713 974 1926

9    Confidentiality
     ---------------

9.1  All information given by the Company to the Contractor or otherwise
     obtained by the Contractor relating to the business or operations of the
     Company or of any person, firm, company or organisation associated with the
     Company including, without limitation, the names and other particulars of
     the Company's customers or clients (except for information which is in or
     enters the public domain other than by breach of this clause 9.1) will be
     treated by the Contractor, its employees, agents and sub-contractors as
     confidential and not used other than for the benefit of the Company nor
     disclosed to third parties without the prior written consent of the
     Company.

9.2  All information given by the Contractor to the Company or otherwise
     obtained by the Company relating to the business or operations of the
     Contractor or of any person, firm, company or organisation associated with
     the Contractor (other than information which is supplied in the provision
     of the Services) including, without limitation, the names and other
     particulars of the Contractor's customers or clients (except for
     information which is in or enters the public domain other than by breach of
     this clause 9.2) will be treated by the Company, its employees, agents and
     sub-contractors as confidential and not used other than for the benefit of
     the Contractor nor disclosed to third parties without the prior written
     consent of the Contractor.

9.3  The foregoing obligations as to confidentiality shall remain in full force
     and effect notwithstanding any termination of this Agreement.

10   Force Majeure
     -------------

     Neither party will be liable to the other for any loss or damage suffered
     as a direct or indirect result of any failure to provide any of the
     Services or to perform or observe any other obligation in this Agreement as
     a result of the occurrence of any of the following: act of God,
     governmental act, war, fire, flood, explosion and commotion or industrial
     dispute of a third party which prevents or substantially hinders such
     performance and observance PROVIDED THAT in the event of any such

                                       7
<PAGE>
 
     circumstances arising the non-performing party shall as soon as practical
     give notice thereof in writing to the other party with reasonable details
     of the nature of the particular circumstances and the anticipated duration
     of suspension or other inhibition on performance and shall further notify
     the other party on the cessation of any such circumstances as are described
     in this clause.

11   Secondment
     ----------

     The provision of Services under this Agreement may include the provision of
     services of an employee of the Contractor made available on a full or part
     time basis to the Company by means of secondment in which event the
     individual shall remain an employee of the Contractor.

12   General
     -------

12.1 Nothing in this Agreement shall be deemed to create a partnership or agency
     relationship between the Company and the Contractor or be deemed to
     authorise either party to incur any liabilities or obligations on behalf of
     or in the name of the other.

12.2 A waiver (whether express or implied) by one of the parties of any of the
     provisions of this Agreement or of any breach of or default by the other
     party in performing any of those provisions shall not constitute a
     continuing waiver and that waiver shall not prevent the waiving party from
     subsequently enforcing any of the provisions of this Agreement not waived
     or from acting on any subsequent breach of or default by the other party
     under any of the provisions of this Agreement.

12.3 Any amendment, waiver or variation of this Agreement shall not be binding
     on the parties unless set out in writing, expressed to amend this Agreement
     and signed by or on behalf of each of the parties.

12.4 The invalidity, illegality or unenforceability of any of the provisions of
     this Agreement shall not affect the validity, legality and enforceability
     of the remaining provisions of this Agreement.

13   Governing law and jurisdiction
     ------------------------------

13.1 This Agreement shall be governed by and construed and interpreted in
     accordance with the laws of England.

13.2 Each of the parties (for itself and on behalf of its respective holding and
     subsidiary companies and the directors, employees and agents of each of
     them) agrees that the English Courts shall have exclusive jurisdiction to
     hear and decide any and all claims, disputes, complaints, actions or
     proceedings ("Claims or Proceedings") whether in contract or tort, which
     may arise at any time out of or in connection with

                                       8
<PAGE>
 
     any of the matters referred to in this Agreement, including, but not
     limited to, any Claim or Proceedings asserting dishonesty, improper or
     illegal conduct or breach of trust or duty or based on the effects of any
     of those matters in any jurisdiction and any Claim or Proceedings which may
     be material to either of the parties but of which that party is unaware or
     does not suspect exists and for this purpose each of the parties
     irrevocably submits to the exclusive jurisdiction of the English Courts.

13.3 The Contractor hereby irrevocably authorises and appoints Norose Notices
     Limited (AMC/99/Z135214, for the attention of the Director of
     Administration) at its registered office for the time being (or such other
     person resident in England as the Contractor may by notice to all other
     parties substitute) to accept service of all legal process arising out of
     or connected with this Agreement and service on Norose Notices Limited (or
     such substitute) shall be deemed to be service on the party concerned.


IN WITNESS whereof this Agreement has been entered into the day and year first
above written.

                                       9
<PAGE>
 
SIGNED by                                     )
                                              )
 .........................................     )
for and on behalf                             )
of the Company                                )       /s/ Ted B. Miller, Jr.
                                                     .......................
                                                     Duly authorised



SIGNED by                                     )
                                              )
 .......................................       )
for and on behalf                             )
of the Contractor                             )       [Illegible signature]
                                                     .......................
                                                     Duly authorised

                                       10
<PAGE>
 
                                   Schedule 1
                                  The Services
                                        


Part A
- ------
 .        Ted Miller, CEO of CTC, who will become CEO of Newco, and David Ivy,
         CFO of CTC, have both committed personally to provide commercial and
         financial expertise to Newco.

 .        Marketing support for launching new services in the UK and worldwide

 .        Infrastructure development and management expertise

 .        Financial, accounting and IT expertise

Part B
- ------

 .        Site acquisition and development training.

                                       11

<PAGE>
 
                                                                   EXHIBIT 10.23
 

                           DATED   23 January, 1997
                           ------------------------



               BERKSHIRE FUND IV INVESTMENT CORP.          (1)

                    BERKSHIRE INVESTORS LLC                (2)

                    BERKSHIRE PARTNERS LLC                 (3)

                  CANDOVER INVESTMENTS PLC                 (4)

                  CANDOVER (TRUSTEES) LIMITED              (5)
                                                             
                                                              
                  CANDOVER PARTNERS LIMITED                (6)
                                                             
                                                              
                  CANDOVER PARTNERS LIMITED                (7)
                                                             
                                                              
                  CANDOVER PARTNERS LIMITED                (8)
                                                             
                                                              
                  CANDOVER PARTNERS LIMITED                (9)
        

                 CASTLE TOWER HOLDING CORPORATION          (10)

               TELEDIFFUSION DE FRANCE INTERNATIONAL S.A.  (11)

                             DIOHOLD LIMITED               (12)

                  -------------------------------------

                          SHAREHOLDERS' AGREEMENT

                  -------------------------------------



                                  Norton Rose
                                     London
<PAGE>
 
                                    CONTENTS
                                    --------
<TABLE> 
<CAPTION> 
Clause                                                                                                     Page No.
- ------                                                                                                     --------
<S>      <C>                                                                                                    <C>  
1        Interpretation.........................................................................................  4

2        The Company's objectives, business, structure and governance...........................................  7

3        Governance of subsidiaries............................................................................. 14

4        Management participation arrangements.................................................................. 15

5        Accounts, audit and reporting.......................................................................... 16

6        Matters requiring agreement............................................................................ 17

7        Guarantees to third parties............................................................................ 21

8        Annual budget.......................................................................................... 21

9        Transfers.............................................................................................. 22

10       Services Agreements with CTC and TdF; Option arrangements.............................................. 27

11       Public offerings....................................................................................... 27

12       Specific performance................................................................................... 29

13       Term................................................................................................... 30

14       Warranties............................................................................................. 31

15       Confidentiality........................................................................................ 31

16       Public Announcements................................................................................... 32

17       Further assurances..................................................................................... 33

18       Other agreements among shareholders.................................................................... 33

19       Subsidiaries to acknowledge agreement.................................................................. 34

20       Compliance by the Company and subsidiaries............................................................. 34

21       Modification........................................................................................... 34

22       Effect of waiver....................................................................................... 34

23       Partial invalidity..................................................................................... 35

24       Implied relationships.................................................................................. 35

25       Costs and Deal Fee..................................................................................... 35
</TABLE> 
                                       1
<PAGE>
 
<TABLE> 
<S>      <C>                                                                                                     <C> 
26       Agreement to take priority............................................................................. 35

27       Entire agreement....................................................................................... 36

28       Governing law and jurisdiction......................................................................... 36

29       Notices................................................................................................ 37

30       Restrictions in the Agreement.......................................................................... 38
<CAPTION> 
Schedule
<S>      <C>                                                                                                     <C> 
1        Deed of Adherence...................................................................................... 39

         Agreed form documents

         Finance Documents
         Warrants
         Original Business Plan
         Transmission Agreement
         Services Agreements
         Articles of Association
</TABLE> 

                                       2
<PAGE>
 
THIS SHAREHOLDERS' AGREEMENT is dated 23rd January, 1997 and is made AMONG:

(1)  BERKSHIRE FUND IV INVESTMENT CORP., a Massachusetts corporation;

(2)  BERKSHIRE INVESTORS LLC, a Massachusetts limited liability corporation;

(3)  BERKSHIRE PARTNERS LLC, a Massachusetts limited liability corporation;

(4)  CANDOVER INVESTMENTS PLC, a company incorporated in England and Wales;

(5)  CANDOVER (TRUSTEES) LIMITED, a company incorporated in England and Wales;

(6)  CANDOVER PARTNERS LIMITED, a company incorporated in England and Wales (as
     general partner of the Candover 1994 UK Limited Partnership);

(7)  CANDOVER PARTNERS LIMITED, a company incorporated in England and Wales (as
     general partner of the Candover 1994 UK No. 2 Limited Partnership);

(8)  CANDOVER PARTNERS LIMITED, a company incorporated in England and Wales (as
     general partner of the Candover 1994 US No. 1 Limited Partnership);

(9)  CANDOVER PARTNERS LIMITED, a company incorporated in England and Wales (as
     general partner of the Candover 1994 US No. 2 Limited Partnership);

(10) CASTLE TOWER HOLDING CORPORATION ("CTC"), a Delaware corporation;

(11) TELEDIFFUSION DE FRANCE INTERNATIONAL S.A.("TdFI"), a company incorporated
     in France;

(12) DIOHOLD LIMITED (the "Company"), a company incorporated in England and
     Wales

WHEREAS

(A)  The Company has been named as the preferred purchaser to acquire the entire
     issued share capital of HSCo from The British Broadcasting Corporation.

(B)  The Company is a private company limited by shares incorporated in England
     and Wales with No. 3242381 under the Companies Act 1985 on 27th August 1996
     and at the date hereof has an authorised share capital of
     (Pounds)114,772,900 divided into [11,477,290] ordinary shares of 1p each
     and [11,465,812,710] redeemable preference shares of 1p each. One hundred
     ordinary shares have been issued nil paid and are beneficially owned by
     CTC.

(C)  This agreement regulates the operation and management of the Company and
     the relationship between its shareholders.

NOW THE PARTIES AGREE as follows:

                                       3
<PAGE>
 
1    Interpretation
     --------------

     In this Agreement unless the context otherwise requires:

1.1  Definitions:

     "Acquisition Agreement" means the agreement of even date between The
     British Broadcasting Corporation and the Company relating to the sale and
     purchase of the whole of the issued share capital of HSCo;

     "Affiliate" means, in relation to any Shareholder, (a) any other member of
     that Shareholder's Group, (b) any limited partnership the general partner
     of which is a member of that Shareholder's Group, (c) any limited partner
     in any limited partnership the general partner of which is a member of that
     Shareholder's Group, (d) any fund managed or advised by a member of that
     Shareholder's Group, (e) any director or employee of any member of that
     Shareholder's Group  (f) in relation to Berkshire Fund IV Investment Corp.,
     Berkshire Fund IV and (g) which is a partnership, that Shareholder's
     constituent partners;

     "Agreement" means this agreement as amended from time to time;

     "Berkshire" means Berkshire Fund IV Investment Corp. and Berkshire
     Investors LLC;

     "Business Plan" means the Original Business Plan of the Company and its
     Subsidiaries as amended from time to time in accordance with clause 8.1;

     "Business Day" means a day (excluding Saturdays) on which banks generally
     are open in London for the transaction of normal banking business;

     "Candover" means Candover Investments PLC, Candover (Trustees) Limited and
     Candover Partners Limited (as general partner of each of the Candover 1994
     UK Limited Partnership, the Candover 1994 UK No. 2 Limited Partnership, the
     Candover 1994 US No. 1 Limited Partnership, and the Candover 1994 US No. 2
     Limited Partnership);

     "Company's Business" has the meaning set out in Clause 2.2;

     "Company's Constitution" means the memorandum and articles of association
     of the Company, as amended from time to time;

     "Company's Directors" means the directors of the Company from time to time;

     "Company Shares" means the Ordinary Shares and the Preference Shares;

     "Finance Documents" means all of the documents referred to in the
     definition of "Financing Documents" in the Loan Agreement in the agreed
     form;

     "Financial Institution" means a bank, an investment trust or investment
     company (within the meaning of Chapter 21 of the rules governing admission
     of securities to listing issued by the London Stock Exchange Limited), unit
     trust, building society, industrial provident or friendly society, any
     other collective investment scheme (as defined in the Financial Services
     Act 1986), or pension fund or insurance company 

                                       4
<PAGE>
 
     (or a subsidiary of any of them) or venture capital fund or mezzanine or
     buy out or buy in fund (or any subsidiary, nominee or trustee of or
     partner, participant or trustee in the same in his or its capacity as
     such), or a partnership established under the Limited Partnerships Act 1907
     or analogous legislation in the State of Massachusetts comprising a fund
     the purpose of which is to make investments in securities or any other
     person who is an authorised person for the purposes of the Financial
     Services Act 1986 (or a subsidiary thereof) or any person whose principal
     business is investment in securities provided that in each such case such
     person is not a company, or part of a group of companies, which is in
     competition with, or a significant supplier to, or a customer of, the
     Company or any of its subsidiaries or the France Telecom group in relation
     to the latter's business activities in the fields of telecommunications and
     broadcasting;

     "Group" means, in relation to a Shareholder, it, its ultimate holding
     company, its subsidiaries and subsidiaries of any such holding company. For
     purposes of this definition, `holding company' and `subsidiary' shall have
     the meanings respectively ascribed to them by section 736 Companies Act
     1985 (as amended);

     "HSCo" means HSCo Limited, a private company limited by shares incorporated
     in England and Wales with registered number 3196207;

     "Listing Rules" means the listing rules made by the London Stock Exchange
     pursuant to part IV of the Financial Services Act 1986 (as amended from
     time to time);

     "London Stock Exchange" means London Stock Exchange Limited;

     "Ordinary Shares" means ordinary shares of 1p each in the capital of the
     Company;

     "Original Business Plan" means the business plan of the Company and its
     Subsidiaries in the agreed form;

     "Permitted Transferees" means a person to whom Company Shares have been
     transferred pursuant to clause 9.2;

     "Preference Shares" means redeemable preference shares of 1p each in the
     capital of the Company;

     "Public Offering" means an offering and sale of Company Shares, pursuant
     to a listing or quotation on a stock exchange, in compliance with
     applicable laws and regulations;

     "Shareholders" means Berkshire, Candover, CTC and TdFI and such other
     holders of Company Shares who become parties to this Agreement from time to
     time;

     "Special Required Majority" means Shareholders holding not less than 40 per
     cent. in value of the aggregate of the Company Shares in issue from time to
     time;

     "Standstill Period" means the period commencing on the date hereof and
     ending on the first to occur of (i) the third anniversary of the date
     hereof and (ii) the effective date of a Public Offering being in the case
     of a listing on the London Stock
                                       5
<PAGE>
 
     Exchange, the admission of Company Shares becoming effective for the
     purposes of the Listing Rules;

     "Subsidiary" or "Subsidiaries" means HSCo and any subsidiary of the Company
     from time to time;

     "Warrant Documentation" means (a) the instrument in the agreed form
     constituting warrants entitling (i) CTC to subscribe for 515,000 Ordinary
     Shares and 514,485,000 Preference Shares and (ii) TdFI to subscribe for
     257,500 Ordinary Shares and 257,242,500 Preference Shares and (b) the
     certificates in the agreed form in respect thereof;

1.2  Headings: section, clause and other headings are for ease of reference only
     --------                                                                   
     and shall not be deemed to form any part of the context or to affect the
     interpretation of this Agreement;

1.3  Parties: references to parties are references to parties to this Agreement;
     -------                                                                    

1.4  Persons: references to persons shall be deemed to include references to
     -------                                                                
     individuals, companies, corporations, firms, partnerships, joint ventures,
     associations, organisations, trusts, states or agencies of state,
     government departments and local and municipal authorities in each case
     whether or not having separate legal personality;

1.5  Defined Expressions: expressions defined in this Agreement bear the defined
     -------------------                                                        
     meaning in the whole of this Agreement including the recitals;

1.6  Sections, Clauses, Schedules and Annexures: references to sections,
     ------------------------------------------                         
     clauses, schedules and annexures are references to sections and clauses of,
     and schedules and annexures to this Agreement;

1.7  Plural and Singular: words importing the singular number shall include the
     -------------------                                                       
     plural and vice versa;

1.8  Negative Obligations: any obligation not to do anything shall be deemed to
     --------------------                                                      
     include an obligation not knowingly to cause that thing to be done;

1.9  Gender: words importing one gender shall include the other gender;
     ------                                                            

1.10 Statutes and Regulations: references to a statute include references to
     ------------------------                                               
     regulations, orders or notices made under or pursuant to such statute or
     regulations made under the statute and references to a statute or
     regulation include references to all amendments to that statute or
     regulation whether by subsequent statute or otherwise and a statute or
     regulation passed in substitution for the statute or regulation referred to
     as incorporating any of the provisions;

1.11 Currency: references to any monetary amount are, unless expressly stated
     ---------                                                               
     otherwise, references to an amount in pounds sterling; and

1.12 Unlawful Provisions: neither the Company nor any Subsidiary shall be bound
     -------------------                                                       
     by any provision of this Agreement to the extent that it would constitute
     an unlawful fetter on any statutory power of the Company and/or any
     Subsidiary (as the case may be), but that provision shall remain valid and
     binding as regards all other parties to which 

                                       6
<PAGE>
 
     it is expressed to apply and such provision shall take effect so as to
     include an obligation on the part of the Shareholders to exercise all their
     respective powers and rights so as to procure, so far as they are able,
     that the Company and/or any Subsidiary (as the case may be) complies with
     such provision notwithstanding that it is not bound by it.

1.13 References to any documents being "in the agreed form" mean in a form
     agreed, and for the purposes of identification signed, by or on behalf of
     the Shareholders and the Company.

1.14 The inclusion of the words "Index-linked" immediately following any
     monetary amount in any provision of this agreement shall mean that on 1
     January 1998 and on each succeeding 1 January such monetary amount shall be
     increased by such percentage as is equal to the percentage increase in the
     Retail Prices Index (All items) between the date of such increase and the
     immediately preceding 31 December and rounded up to the nearest
     (Pounds)100.

2    The Company's objectives, business, structure and governance
     ------------------------------------------------------------

2.1  The Company's Primary Objects: The primary objects of the Company are to:
     -----------------------------                                            

     (a)  Purchase HSCo: enter into and discharge its obligations under the
          -------------                                                    
          Acquisition Agreement;

     (b)  Funding Purchase: enter into arrangements in respect of the funding of
          ----------------                                                      
          the acquisition of HSCo;

     (c)  Financing HSCo: enter into the arrangements contemplated by the
          --------------                                                 
          Finance Documents regarding the capitalisation of HSCo;

     (d)  Hold Shares in HSCo : hold all the issued shares of HSCo subject to
          --------------------                                               
          the terms of this Agreement;

     (e)  Management: undertake generally such actions and matters as are
          ----------                                                     
          necessary to manage the Company's shareholding in HSCo; and

     (f)  Incidental: undertake such other actions, matters or things as may be
          ----------                                                           
          necessary to achieve or are incidental to any of the above objects;

2.2  The Company's Business: The Company's Business shall consist of
     ----------------------                                         
     implementing the objects set forth in Clause 2.1.  The Company shall carry
     on no business other than the Company's Business, except as authorized
     pursuant to clause 6.1(e).

2.3  The Company's Structure: Except to the extent already the case, the
     -----------------------                                            
     Shareholders agree to proceed with all due expedition to structure or
     restructure the Company in accordance with the following provisions:

     (a)  Memorandum and Articles: the Company shall have a memorandum of
          -----------------------                                        
          association and articles of association in the agreed form;

     (b)  Number of the Company's Directors: the number of Directors of the
          ---------------------------------                                
          Company shall be 7;

                                       7
<PAGE>
 
     (c)  Shareholders' Entitlement to Nominate Directors of the Company: the
          --------------------------------------------------------------     
          Shareholders shall exercise their voting entitlements in the Company
          to procure that at any time:

          (i)   Berkshire, for so long as it (when taken together with its
                Affiliates and Permitted Transferees) holds 15 per cent or more
                of the equity share capital of the Company, shall have the right
                to appoint (and remove) one Director;

          (ii)  Candover, for so long as it (when taken together with its
                Affiliates and Permitted Transferees) holds 15 per cent or more
                of the equity share capital of the Company, shall have the right
                to appoint (and remove) one Director (in accordance with clause
                2.6);

          (iii) CTC, for so long as it (when taken together with its Affiliates
                and Permitted Transferees) holds 15 per cent or more of the
                equity share capital of the Company, shall have the right to
                appoint (and remove) one Director;

          (iv)  TdFI, for so long as it (when taken together with its Affiliates
                and Permitted Transferees) holds 15 per cent or more of the
                equity share capital of the Company, shall have the right to
                appoint (and remove) one Director.

          Directors of the Company appointed pursuant to 2.3(c) shall be
          nominated by written notice to each Shareholder. Each Director of the
          Company so appointed may be removed and replaced at any time by the
          Shareholder entitled to nominate that Director; each Shareholder with
          a right to nominate a Director of the Company may assign or waive that
          right in connection with a transfer of the Shareholder's Company
          Shares pursuant to Clause 9 or otherwise (provided that no Shareholder
          (when taken together with its Affiliates and Permitted Transferees)
          shall be entitled to appoint more than one Director and provided that
          any transferee shall only be entitled to appoint a Director if such
          transferee (when taken together with its Affiliates and its Permitted
          Transferees) holds 15 per cent or more of the equity share capital of
          the Company) and each assignor of that right shall give notice to the
          Directors of the Company of any such assignment immediately. If a
          Shareholder removes from office a Director of the Company nominated by
          that Shareholder, that Shareholder shall indemnify the Company against
          any loss, liability or cost that the Company may suffer or incur as a
          result of any claim by such Director arising out of such removal.  The
          first Directors nominated pursuant to this clause 2.3(c) shall be as
          follows:

<TABLE>
<CAPTION>
 
================================================================================
        Name of Shareholder                               Nominee
- --------------------------------------------------------------------------------
 <S>                                            <C>
 Berkshire                                      Carl Ferenbach
- --------------------------------------------------------------------------------
 Candover                                       Douglas Fairservice
- --------------------------------------------------------------------------------
 CTC                                            Ted B. Miller, Jr.
- --------------------------------------------------------------------------------
 TdFI                                           Michel Azibert
================================================================================
</TABLE>

                                       8
<PAGE>
 
     (d)  Additional Directors of the Company: any additional Directors of the
          -----------------------------------                                 
          Company shall be nominated and elected, and may be removed and
          replaced at any time, by a written notice signed by or on behalf of
          every Shareholder who (when taken together with its Affiliates and
          Permitted Transferees) holds 15 per cent. or more of the equity share
          capital of the Company.

     (e)  Observers: each of the Shareholders shall be entitled to nominate one
          ---------                                                            
          observer who shall be entitled to attend and speak at meetings of the
          Directors of the Company.  Such observers shall not be Directors and
          shall neither be entitled to vote at meetings of the Directors of the
          Company nor have any authority to bind the Company.

     (f)  Majority Rule: except as provided in this Agreement, resolutions of
          -------------                                                      
          the Directors of the Company shall be deemed to be passed if approved
          by a majority of the Directors of the Company voting thereon at a
          meeting of Directors of the Company at which a majority of the
          Directors of the Company is present, provided the meeting is duly
          convened and held after notice provided in accordance with clause
          2.3(i) (which meeting may be a telephone meeting conducted as provided
          in the Articles of Association), or approved in writing signed by all
          the Directors of the Company in accordance with the Company's
          Constitution.

     (g)  Committees of the Directors of the Company: There shall be established
          ------------------------------------------                            
          two committees of the Directors of the Company, pursuant to the
          Company's Constitution, as follows:

               an Audit Committee consisting of any number of non-executive
               Directors of the Company (including the Directors appointed from
               time to time under and in accordance with clause 2.3(c)) selected
               by the Directors of the Company as a board and having the
               functions customary to an Audit Committee; and

               a Remuneration Committee consisting of any number of non-
               executive Directors of the Company (including the Directors
               appointed from time to time under and in accordance with clause
               2.3(c)) selected by the Directors of the Company as a board and
               having only advisory powers unless other powers are specifically
               delegated by the Directors of the Company as a board.

               Such committees shall have the powers delegated by resolution of
               the Directors of the Company.

     (h)  No Action Until Designee Replaced: If a Director of the Company
          ---------------------------------                              
          nominated by a Shareholder resigns, is removed or for any other reason
          ceases to serve as a Director of the Company and/or as a member of any
          committee of the Directors of the Company on which such person had the
          right to serve, such Shareholder shall have the right to nominate the
          successor of such person, and provided such Shareholder nominates a
          successor within five business days after the predecessor ceased to
          serve as a Director of the Company or as a member of such committee,
          neither the Directors of the Company nor such committee shall take any
          action, whether at a meeting of the Directors of the Company (or a
          committee thereof) or otherwise, until such successor has been elected
          as a Director of the Company or a member of such 

                                       9
<PAGE>
 
          committee, as the case may be; provided that in no event may any
          Shareholder cause a single delay of more than 10 days by the failure
          of such Shareholder to exercise its rights under this clause 2.3.(h).

     (i)  No meeting of the Directors of the Company or of a committee of the
          Directors of the Company shall normally be convened on less than 14
          days' notice, but such a meeting may be convened by giving not less
          than 2 days' notice if the interests of the Company would be likely to
          be adversely affected to a material extent if the business to be
          transacted at such meeting was not dealt with as a matter of urgency
          or if all the Directors agree.  An agenda of the business to be
          transacted at such meeting shall be sent with any such notice and any
          documents relating to issues to be considered at any such meeting
          shall be distributed in advance to all the Directors (or, in the case
          of a committee, to the members of that committee) and their alternates
          so as to ensure that they are received at least seven days (or, if
          less than 7 days' notice of such meeting is given, as soon as
          practicable) prior to the date fixed for such meeting.

     (j)  The Company shall adopt an accounting reference date of 31st December.

2.4  Subscription for Company Shares
     -------------------------------

     (a)  Subject to the conditions precedent set out in clause 4.1.1 of the
          Acquisition Agreement having been satisfied or waived on or before
          31st March 1997 (or such later date as all the Shareholders may agree
          in writing), the Shareholders undertake to each other to subscribe in
          cash at par for the numbers of fully paid Ordinary Shares and
          Preference Shares and to pay to the Company the respective sums set
          out below no later than the date set for completion of the Acquisition
          Agreement:

                                       10
<PAGE>
 
<TABLE>
<CAPTION>
======================================================================= 
Name                        No. of       No. of         Subscription
                            Ordinary     Preference     Price in Cash
                            Shares       Shares           (Pounds)
<S>                         <C>          <C>            <C>
- -----------------------------------------------------------------------
Berkshire Fund IV           1,638,637  1,636,997,891   16,386,365.28
Investment Corp.
- ----------------------------------------------------------------------- 
Berkshire Investors LLC       163,863    163,699,609    1,638,634.72
- -----------------------------------------------------------------------
Candover Investments          543,966    603,802,593    6,043,465.59
PLC
- ----------------------------------------------------------------------- 
Candover (Trustees)            60,441              0          604.41
Limited
- ----------------------------------------------------------------------- 
Candover Partners           1,095,808  1,094,712,192      10,958,080
Limited (as general
partner of the Candover
1994 UK Limited
Partnership)
- ----------------------------------------------------------------------- 
Candover Partners             296,963    296,666,037       2,969,630
Limited (as general
partner of the Candover
1994 UK No. 2 Limited
Partnership)
- ----------------------------------------------------------------------- 
Candover Partners              53,187     53,133,813         531,870
Limited (as general
partner of the Candover
1994 US No. 1 Limited
Partnership)
- ----------------------------------------------------------------------- 
Candover Partners             648,235    647,586,765       6,482,350
Limited (as general
partner of the Candover
1994 US No. 2 Limited
Partnership)
- ----------------------------------------------------------------------- 
CTC                         3,525,590  3,522,164,310      35,256,899
- -----------------------------------------------------------------------
TdFI                        2,163,000  2,160,837,000      21,630,000
=======================================================================
</TABLE>

     (b)  subject as provided in clause 2.4(a) above, the Company shall allot
          and issue the Preference Shares and Ordinary Shares to the
          Shareholders in accordance with sub-paragraph (a) above and shall
          enter the names of the allottees in the register of members of the
          Company as registered holders of such shares and shall issue and
          deliver to the Shareholders share certificates duly executed as deeds
          by the Company for the shares subscribed by them.

     (c)  CTC consents to the subscriptions provided for in this Agreement and
          waives or agrees to procure the waiver of any rights or restrictions
          which may exist in the Articles or otherwise which might prevent any
          such subscriptions.

2.5  Governance of the Company:
     ------------------------- 

                                       11
<PAGE>
 
     (a)  General Provisions: The Company shall be operated in accordance with
          ------------------                                                  
          the Company's Constitution and the terms of this Agreement and any
          agreement entered into pursuant to this Agreement and, while
          effective, pursuant to the Finance Documents. Each of the Shareholders
          agrees to perform and observe all terms and conditions to be observed
          by them and performed under any contract or arrangement from time to
          time subsisting between them and the Company or any of the
          Subsidiaries, and the Shareholders (in their capacity as Shareholders)
          agree to procure (insofar as they are able by the exercise of such
          rights and powers) that the Company and the Subsidiaries perform and
          observe this Agreement and all such agreements.

     (b)  Directors' Meetings of the Company: Meetings of the Directors of the
          ----------------------------------                                  
          Company shall be held at regular intervals as shall be determined by
          the Directors of the Company. Such meetings may be carried on in any
          manner permitted by the Company's Constitution but the parties shall
          each use all reasonable endeavours to ensure that actual meetings at
          which Directors of the Company are personally present in one room
          (barring unscheduled unavailability) occur not less frequently than at
          quarterly intervals at such place or places within the United Kingdom
          as the Directors of the Company may from time to time determine. The
          Company shall meet the reasonable travel and accommodation expenses of
          Directors of the Company attending meetings of Directors of the
          Company.  Any Director of the Company who is unable to attend a
          meeting in person shall have the right to attend the meeting by means
          of conference telephone.

     (c)  Chairman of the Company: The chairman of the board of Directors of the
          -----------------------                                               
          Company shall not have a second or casting vote on any resolution or
          matter and shall be appointed by the Directors of the Company; the
          first chairman shall be Ted B. Miller, Jr.  The Shareholders agree
          that it is their intention for the chairman, in due course, to be an
          independent non-executive Director appointed by the Directors of the
          Company and that such appointment will be made as soon as reasonably
          practicable.

     (d)  Responsibility of the Directors: The Directors of the Company shall be
          -------------------------------                                       
          responsible for the overall guidance and direction of the Company.

     (e)  Chief Executive: The Directors of the Company may appoint a chief
          ---------------                                                  
          executive officer of the Company on such terms as they see fit but
          always on the basis that the chief executive officer reports and is
          responsible to the Directors of the Company.

     (f)  Indemnification of Directors: The Company shall indemnify the
          ----------------------------                                 
          Directors of the Company to the greatest extent permitted by
          applicable law with respect to any liability, claim or expense
          incurred arising out of or related to their service as Directors of
          the Company and shall obtain Directors and Officers liability
          insurance coverage to the extent available on reasonable terms, as
          determined by resolution of the Directors of the Company.

2.6  Candover Director:  If the Candover 1994 US No. 2 Limited Partnership (the
     -----------------                                                         
     "US Partnership") is the beneficial owner of any Company Shares, the US
     Partnership shall be entitled, on behalf of Candover, to appoint and remove
     the one Director which Candover is entitled to nominate pursuant to clause
     2.3(c) who shall have the right to inspect and copy the Company's and any
     Subsidiary's books and records, to 

                                       12
<PAGE>
 
     inspect properties, to receive materials sent to the Directors and to
     consult frequently with and advise the management of the Company and its
     Subsidiaries on matters relating to their business and affairs including
     their operating plans on behalf of the US Partnership (all of such rights
     being "Management Rights"). Such Management Rights shall be exercised by
     Candover Partners Limited (for so long as it is a subsidiary of Candover
     Investments PLC and the general partner of the US Partnership) on behalf of
     the US Partnership for the benefit of Candover. If at any time the US
     Partnership is not the beneficial owner of any Company Shares, Management
     Rights shall be exercised by Candover Partners Limited (for so long as it
     is the beneficial owner of any Company Shares and is a subsidiary of
     Candover Investments PLC and the general partner of any limited partnership
     comprised in the Candover 1994 Fund) and, thereafter, by Candover or such
     person as Candover may nominate.

2.7  The Company undertakes to Candover and Berkshire that it shall, unless
     Candover and Berkshire otherwise consent in writing, pay quarterly in
     arrears on the first days of January, April, July and October in each year
     a fee in respect of the services of each of the Directors from time to time
     appointed by Candover and Berkshire respectively at the rate of
     (Pounds)15,000 (Index-linked) (plus value added tax, if applicable) per
     annum (together with any expenses reasonably and properly incurred by him
     on the business of the Group).  Such fees shall be payable to Candover and
     Berkshire respectively or as they may otherwise direct.  The first
     instalment of such fee shall be paid on 1st April 1997 and shall be reduced
     in proportion to reflect the proportion of the quarter ending on that date
     represented by such period.

3    Governance of subsidiaries
     --------------------------

3.1  Each Director of the Company from time to time shall be appointed as a
     director of each Subsidiary of the Company.

3.2  The provisions of clauses 2.3(e), (f), (g), (h), (i) and (j), 2.5(a), (b),
     (c), (d), (e) and (f) and 2.6 shall apply, mutatis mutandis, in relation to
     each Subsidiary in the same way as they apply to the Company.

4    Management participation arrangements
     -------------------------------------

4.1  Management Shareholder Agreement: Subject to clause 4.3, the Shareholders
     --------------------------------                                         
     approve the issuance of Company Shares at a price per share not less than
     the price paid by each of the Shareholders for the Company Shares pursuant
     to clause 2.4(a) in such amount and to such management personnel of the
     Company and of the Subsidiaries, as agreed from time to time by each
     Shareholder which, when taken together with its Affiliates, holds 15 per
     cent or more of the equity share capital of the Company.

4.2  Management Options: Subject to clause 4.3, the Shareholders approve the
     ------------------                                                     
     grant by the Company of options over Company Shares in such amount and to
     such management personnel of the Company and the Subsidiaries as agreed
     from time to time by each Shareholder which, when taken together with its
     Affiliates, holds 15 percent or more of the equity share capital of the
     Company, such options to be evidenced by management option agreements in a
     form approved by each Shareholder which, when taken together with its
     Affiliates, holds 15 percent or more of the equity share capital of the
     Company.  The Shareholders shall, in their capacities as shareholders of
     the Company, take all reasonable actions necessary to 

                                       13
<PAGE>
 
     cause the Company to perform its obligations under those management option
     agreements.

4.3  Limit: the aggregate number of Company Shares to be issued pursuant to
     -----                                                                 
     clause 4.1 and over which options may be granted pursuant to clause 4.2
     shall not exceed in aggregate 515,000 Ordinary Shares and 514,485,000
     Preference Shares minus the number of Company Shares subscribed by Ted B.
     Miller Jr. (or family trusts or relations of Ted B. Miller Jr.) and David
     Ivy from time to time.

4.4  Stapled Shares: the following principles shall apply in relation to the
     --------------                                                         
     issue of Company Shares pursuant to clause 4.1 and the grant of options
     over Company Shares pursuant to clause 4.2:

     (a)  in relation to clause 4.1, Company Shares shall be issued only in
          tranches of 1000 Company Shares comprising one Ordinary Share and 999
          Preference Shares;

     (b)  in relation to clause 4.2, options over Company Shares may only be
          granted over tranches of 1,000 Company Shares, comprising 1 Ordinary
          Share and 999 Preference Shares.

5    Accounts, audit and reporting
     -----------------------------

5.1  Financial Year: Each financial year of the Company and each Subsidiary
     --------------                                                        
     shall end on the date determined by resolution of the Directors of the
     Company.

5.2  Reports etc.: The Company and each Subsidiary (where applicable) shall:
     ------------                                                           

     (a)  Adopt Policies: adopt such accounting, administrative, insurance and
          --------------                                                      
          other policies and systems consistent with UK generally accepted
          accounting principles from time to time as the Directors of the
          Company may from time to time determine;

     (b)  Books, Records etc.: maintain accurate and complete books, records,
          -------------------                                                
          accounts, statements and documents of its respective operations,
          businesses and financial affairs, all of which shall be available to
          each of the Shareholders initially party to this Agreement, their
          respective nominated Directors and their authorized representatives
          for the purpose of inspection and making copies thereof and taking
          extracts therefrom;

     (c)  Furnish Reports: prepare and furnish to each of the Shareholders
          ---------------                                                 
          within 30 days after the end of each month during the term of this
          Agreement such financial statements and business reports as may be
          available (including, without limitation, copies of any financial
          statements and business reports furnished pursuant to the Finance
          Documents);

     (d)  Financial Statements: prepare and deliver to each of the Shareholders
          --------------------                                                 
          (i) consolidated financial statements in respect of the Company and
          its Subsidiaries consisting of a balance sheet, statement of revenue
          and expenses and statement of changes in financial position; (ii)
          copies of any financial statements and business reports furnished
          pursuant to the Finance Documents; and (iii) such other statements as
          the Directors of the Company may from time to time consider advisable,
          in each case prepared in accordance with the 

                                       14
<PAGE>
 
          generally accepted accounting principles approved by resolution of the
          Directors of the Company, as follows:

          (i)  Quarterly Statements: unaudited quarterly consolidated financial
               --------------------                                            
               statements shall be prepared and delivered to each of the
               Shareholders promptly after they are available and in any event
               within 45 days' after the end of each quarter; and

          (ii) Annual Statements: audited annual consolidated financial
               -----------------                                       
               statements, accompanied by the report of the Company's auditors
               thereon, shall be prepared and delivered to each of the
               Shareholders promptly when available and in any event within 90
               days' after the end of each financial year of the Company;

          provided that all or any of the requirements of this clause 5.2(d)
          may, to the extent permitted by applicable law, be waived by unanimous
          resolution of those Directors of the Company nominated by the
          Shareholders; and

     (e)  Keep Informed: keep the Shareholders informed on a timely basis of all
          -------------                                                         
          material developments (as determined by the Directors of the Company)
          affecting the conduct of their respective businesses.

6    Matters requiring agreement
     ---------------------------

6.1  Matters Requiring Agreement of Shareholders - the Company: The Shareholders
     ---------------------------------------------------------                  
     shall exercise all voting and other powers of control available to them
     directly or indirectly in relation to the Company so as to procure (insofar
     as they are able by the exercise of such rights and powers in accordance
     with clause 18.4 of this Agreement) that the Company shall not without the
     prior agreement in writing of each Shareholder which, when taken together
     with its Affiliates, holds 15 per cent or more of the equity share capital
     of the Company for the time being:

     (a)  Acquisitions and Dispositions: acquire or establish any Subsidiary
          -----------------------------                                     
          other than HSCo or make any acquisition or disposal which would
          constitute a super class 1 transaction or a class 2 transaction if the
          share capital of the Company were listed on the London Stock Exchange;

     (b)  Share Issues: issue or offer to any person any share  or loan capital,
          ------------                                                          
          or other securities convertible into share  or loan capital, in the
          Company or purchase or redeem or reorganise any share or loan capital
          in the Company except (i) Company Shares issued pursuant to clause
          4.1, (ii) options issued pursuant to clause 4.2 and Company Shares
          issued upon exercise of those options, (iii) Company Shares to be
          issued to Ted. B. Miller, David Ivy and George Reese respectively
          simultaneously with the subscription by the Shareholder pursuant to
          clause 2.4 and (iv) Company Shares to be issued pursuant to the terms
          of the Warrant Documentation;

     (c)  issue or offer any share or loan capital, or other securities
          convertible into share or loan capital otherwise than to the
          Shareholders pro rata to their then existing holdings of Company
          Shares with a view to each Shareholder being permitted to subscribe
          for such number of Company Shares as will enable it to maintain its
          percentage shareholding in the issued share capital of the Company)
          except (i) Company Shares issued pursuant to clause 4.1, (ii) 

                                       15
<PAGE>
 
          options issued pursuant to clause 4.2 and Company Shares issued upon
          exercise of those options, (iii) Company Shares to be issued to Ted.
          B. Miller, David Ivy and George Reese respectively simultaneously with
          the subscription by the Shareholders pursuant to clause 2.4 and (iv)
          Company Shares to be issued pursuant to the terms of the Warrant
          Documentation;

     (d)  Subsidiaries' Shares: transfer (other than as required by the Finance
          --------------------                                                 
          Documents) or otherwise dispose of the shares it holds in each of the
          Subsidiaries.

     (e)  Transactions with Shareholders: enter into a transaction with a
          ------------------------------                                 
          Shareholder or any Affiliate of a Shareholder, except as expressly
          contemplated by this Agreement or make any variation or amendment to
          any arrangements (whether or not contemplated by this Agreement)
          between the Company and any Shareholders or any Affiliate of any
          Shareholder;

     (f)  Other Business: carry on any business other than the Company's
          --------------                                                
          Business;

     (g)  Capital Expenditure: incur capital expenditure in any financial year
          -------------------                                                 
          in excess of that which is included in the Company's budget for that
          year as approved in writing by all the Shareholders;

     (h)  Banking and Other Financing Facilities: enter into any banking or
          --------------------------------------                           
          other financing facility (other than pursuant to the Finance
          Documents) or vary the terms of any banking or other financing
          facility;

     (i)  Guarantees and Indemnities: give any guarantee or indemnity in respect
          --------------------------                                            
          of the obligations of any other person (other than a wholly-owned
          Subsidiary provided that such guarantee or indemnity is expressly
          contemplated by the Business Plan, the Finance Documents or the
          Acquisition Agreement);

     (j)  Creation of Security: create any mortgage, charge, lien (other than a
          --------------------                                                 
          lien arising in the ordinary course of trading) or encumbrance on any
          assets (other than pursuant to the Finance Documents);

     (k)  Lending of Money: lend any money to any other person (other than to a
          ----------------                                                     
          wholly-owned Subsidiary provided that such loan is expressly
          contemplated in the Business Plan or made to finance the payment of
          the consideration under the Acquisition Agreement);

     (l)  Joint Venture Arrangements: enter into any arrangements which
          --------------------------                                   
          constitute a partnership or joint venture with any other person or
          persons;

     (m)  Litigation: commence or settle any litigation involving a claim
          ----------                                                     
          exceeding (Pounds)500,000;

     (n)  The Company's Constitution: make any alteration to its Constitution.
          --------------------------                                          

     (o)  Winding Up: pass any resolution for winding up;
          ----------                                     

     (p)  Receiver or Administrator: apply for the appointment of a receiver or
          --------------------------                                           
          an administrator;

                                       16
<PAGE>
 
       (q)  Dividends: declare, make or pay any dividend (interim or final) save
            ---------
            in respect of dividends payable in respect of the Preference Shares
            in accordance with the Company's Constitution; and

       (r)  Incentive Schemes: establish, approve or make any amendment or
            -----------------
            variation to any incentive or bonus scheme in relation to any
            employee of the Company or any subsidiary.

6.2    Matters Requiring Agreement of Shareholders - Subsidiaries: The
       ----------------------------------------------------------
       Shareholders shall exercise all voting and other powers of control
       available to them directly or indirectly in relation to the Company, and
       the Company shall exercise all voting and other powers of control
       available to it so as to procure (insofar as they are able by the
       exercise of such rights and powers in accordance with clause 18.4 of this
       Agreement) that each Subsidiary shall not without the prior agreement in
       writing of each Shareholder which, when taken together with its
       Affiliates, holds 15 per cent or more of the equity share capital of the
       Company for the time being:

       (a)  Acquisitions and Disposals: make any acquisition or disposal which
            --------------------------
            would constitute a super class 1 transaction or a class 2
            transaction if the share capital of that Subsidiary were listed on
            the London Stock Exchange;

       (b)  Share Issues: issue or offer to any person any shares or loan
            ------------
            capital, or other securities convertible into shares or loan
            capital, of such Subsidiary or purchase or redeem or reorganise any
            share or loan capital of the Company except for any shares issued or
            offered to the Company;

       (c)  Transactions with Shareholders: enter into a transaction with a
            ------------------------------
            Shareholder or any Affiliate of a Shareholder, except as expressly
            contemplated by this Agreement;

       (d)  Other Business: (in the case of HSCo) carry on any category of
            --------------
            business other than one which is carried on at the date of the
            completion of the Acquisition Agreement including, for the avoidance
            of doubt, digital transmission for radio or television;

       (e)  Capital Expenditure: incur capital expenditure in any financial year
            -------------------
            in excess of that which is included in such Subsidiary's budget for
            that year as approved in writing by all of the Shareholders;

       (f)  Banking and other Financing Facilities: enter into any banking or
            --------------------------------------
            other financing facility (other than pursuant to the Finance
            Documents) or vary the terms of any banking or other financing
            facility;

       (g)  Guarantees and Indemnities: give any guarantee or indemnity in
            --------------------------
            respect of the obligations of any other person (other than a wholly-
            owned Subsidiary provided that such guarantee or indemnity is
            expressly contemplated by the Business Plan or the Finance
            Documents);

       (h)  Creation of Security: create any mortgage, charge, lien (other than 
            --------------------
            a lien arising in the ordinary course of trading) or encumbrance on
            any assets (other than pursuant to the Finance Documents);

                                      17
<PAGE>
 
       (i)  Lending of Money: lend any money to any other person (other than to
            ----------------
            the Company);

       (j)  Joint Venture Arrangements: enter into any arrangements which
            --------------------------
            constitute a partnership or joint venture with any other person or
            persons;

       (k)  Litigation: commence or settle any litigation involving a claim
            ----------
            exceeding (Pounds)500,000;

       (l)  Subsidiary's Constitution: make any alteration to any Subsidiary's
            -------------------------
            memorandum or articles of association.

       (m)  Winding Up: pass any resolution for winding up;
            ----------

       (n)  Receiver or Administrator: apply for the appointment of a receiver
            -------------------------
            or an administrator;

       (o)  Dividends: declare, make or pay any dividend (interim or final) save
            ---------
            to the extent needed to fund the payment of dividends on Preference
            Shares (but subject always to the terms of the Finance Documents);

       (p)  Business Plan: reorganise or change the nature or scope of its
            -------------
            business from that as set out in the Business Plan (as amended from
            time to time in accordance with clause 8.1); and

       (q)  Incentive Schemes: establish, approve or make any amendment or
            -----------------
            variation to any incentive or bonus scheme in relation to any
            employee of the Company or any Subsidiary.

6.3    Matters Requiring Consent of Particular Shareholder: The Shareholders
       ---------------------------------------------------
       shall exercise all voting and other powers of control available to them
       (directly or indirectly) in relation to the Company so as to procure
       (insofar as they are able by the exercise of such rights and powers) that
       neither the Company nor any Subsidiary shall do or permit or suffer to be
       done any act or thing which will cause the rights of any Shareholder (in
       that Shareholder's capacity as a holder of the Company Shares) to be
       adversely affected in a manner not applicable to all Shareholders,
       without such Shareholder's written consent.

6.4    Without prejudice to the operation of clause 2.6, each Shareholder agrees
       that it will procure that entities comprised within it, its Affiliates
       and Permitted Transferees shall together ensure that one entity shall at
       all times be authorised to exercise the rights of that Shareholder under
       this Agreement. The identity of such entity for the time being shall be
       notified to all other Shareholders.

6.5    Notwithstanding any other provisions of this Agreement neither the
       Company nor any Subsidiary shall issue any share capital or other
       securities convertible into share capital if the consequence of such
       issue would be that The British Broadcasting Corporation would thereby
       become entitled to terminate the Transmission Contract to be entered into
       between The British Broadcasting Corporation and HSCo (substantially in
       the form of the draft in the agreed form) pursuant to clause 13.5 thereof
       (unless The British Broadcasting Corporation shall have confirmed in
       writing that it will not exercise its right of termination in consequence
       of such transfer or disposal).

                                      18
<PAGE>
 
7      Guarantees to third parties
       ---------------------------

7.1    No Shareholder shall be under any obligation to give any guarantee or
       indemnity or the like on behalf of the Company or any Subsidiary.

7.2    Save as expressly set out in this Agreement, no Shareholder shall be
       under any obligation to subscribe for shares of the Company or to lend
       money to the Company.

8      Annual budget
       -------------

8.1    The Shareholders shall exercise all voting and other powers of control
       available to them directly or indirectly in relation to the Company so as
       to procure (insofar as they are able by the exercise of such rights and
       powers) that, not less than 90 days before the beginning of each
       financial year, the Company shall draw up an annual budget for the
       financial year next following in such format as the Shareholders shall
       prescribe from time to time (but to include a capital expenditure
       forecast and a cashflow forecast) and shall submit each such annual
       budget and any proposed amendments to the Business Plan for review and
       approval to each Shareholder which, when taken together with its
       Affiliates, holds 15 per cent or more of the equity share capital of the
       Company for the time being. Each such annual budget and proposed
       amendments to the Business Plan shall be subject to the approval of each
       Shareholder which, when taken together with its Affiliates, holds 15 per
       cent or more of the equity share capital of the Company for the time
       being. Each such Shareholder undertakes to the other Shareholders to act
       in good faith when reviewing each such annual budget and proposed
       amendments to the Business Plan and undertakes not unreasonably to
       withhold its approval of such documents.

9      Transfers
       ---------

9.1    No Transfers: During the Standstill Period unless prior consent in 
       ------------
       writing is obtained from each Shareholder which, when taken together with
       its Affiliates, holds 15 per cent or more of the equity share capital of
       the Company or except as provided in clause 9.2 or clause 9.4.2, no
       Shareholder may sell, transfer, mortgage, charge or otherwise dispose of
       all or any of its Company Shares or any legal or beneficial interest
       therein or any rights to subscribe therefor.

9.2    Permitted Transfers: Notwithstanding the provisions in clauses 9.1, 9.4,
       -------------------
       9.5 and 9.6 but subject to clauses 9.3 and 9.8, any Shareholder may
       transfer its holding of, or beneficial interest in, Company Shares (i) to
       a person who is an Affiliate of the transferor at the date
       hereof(provided, however, that for the purposes of this clause 9.2(i)
       Berkshire and CTC shall be deemed not to be Affiliates of one another),
       (ii) in the case of Berkshire, or as the case may be, Candover, to a
       person who after the date hereof becomes an Affiliate of Berkshire or, as
       the case may be, Candover and is a Financial Institution, and (iii) in
       the case of a Shareholder who is an individual, to that individual's wife
       or husband, widow or widower, or child or remoter issue (each a "Related
       Person") (being in any event a person aged over 18) or to the trustees of
       any trust created in favour of that individual and/or any Related Person
       (notwithstanding that one or more charities may be named as residuary
       beneficiaries of any such trust), provided that (a) as a condition of
       each of the permitted transfers, the transferee shall be required to
       comply with clause 9.8, (b) where Company Shares have been transferred
       from a Shareholder to an Affiliate and subsequently the transferee ceases
       to be an Affiliate of that Shareholder, then the Shareholder concerned
       shall procure that such Affiliate shall forthwith transfer such Company

                                      19
<PAGE>
 
       Shares back to the original Shareholder and (c) each Shareholder agrees
       not to effect transfers or changes in such Shareholder's Group in such a
       manner as to frustrate the intent of this clause 9.2, which is to permit
       transfers only to and holdings by related persons and entities.

9.3    Change of Control, Stapling and Options: Notwithstanding any other
       ---------------------------------------
       provisions of this Agreement:

       (a)  no Shareholder shall be entitled to transfer or otherwise dispose of
            an interest in any Company Shares if the consequence of such
            transfer or disposal would be that (i) The British Broadcasting
            Corporation would thereby become entitled to terminate the
            Transmission Contract to be entered into between The British
            Broadcasting Corporation and HSCo (substantially in the form of the
            draft in the agreed form) pursuant to clause 13.5 thereof (unless
            the British Broadcasting Corporation shall have confirmed in writing
            that it will not exercise its right of termination in consequence of
            such transfer or disposal) or (ii) any licence held by the Company
            or any Subsidiary under the Telecommunications Act 1984 or the
            Wireless Telegraphy Act 1949 would thereby become capable of being
            terminated or revoked in accordance with its terms, unless the
            relevant regulator shall have confirmed in writing that the relevant
            licence will not be terminated in consequence of the proposed
            transfer or disposal or (iii) the Company would become a subsidiary
            of any company; and

       (b)  Company Shares may only be transferred or otherwise disposed of in
            tranches of 1,000 Company Shares, comprising 1 Ordinary Share and
            999 Preference Shares (or, following the redemption of any
            Preference Shares, in such proportion as the aggregate number of
            Ordinary Shares then in issue bears to the aggregate number of
            Preference Shares then in issue). For the purposes of this clause
            9.3(b), Candover Investments PLC and Candover (Trustees) Limited
            shall be treated as if they together constituted one Shareholder.

9.4.1  Standstill Period: Notwithstanding any other provisions of this
       -----------------                                              
       Agreement, none of the Shareholders shall during the Standstill Period
       enter into discussions or negotiations with any person other than another
       Shareholder in respect of the transfer or other disposal of Company
       Shares save as provided in clause 9.2 or save in preparation for a Public
       Offering pursuant to clause 11.

9.4.2  Subject always to clauses 9.3  each of the Shareholders shall be entitled
       during the Standstill Period to discuss with another Shareholder the
       possible sale of Company Shares and may agree a price for such a sale
       with such Shareholder (the "Sale Price") provided however that CTC and
       Berkshire shall not be entitled to enter into discussions between
       themselves in respect of any Company Shares held by either of them and
       accordingly they shall not be entitled to agree a price between
       themselves for the purposes of this clause 9.4.2. If a price is agreed as
       aforesaid (but subject always to clauses 9.3 and 9.8):

       (a)  the Shareholder who desires to transfer the shares (for the purposes
            of this clause 9.4.2 the "Vendor" shall give to the Company notice
            in writing of such desire (for the purposes of this clause 9.4 a
            "Transfer Notice"). Subject 

                                      20
<PAGE>
 
            as hereinafter mentioned a Transfer Notice shall specify the name of
            the other Shareholder to whom the Vendor proposes to transfer the
            shares specified therein (for the purposes of this clause 9.4 the
            "Sale Shares") in the event that they are not purchased pursuant to
            this clause 9.4 and the price which has been agreed with that other
            Shareholder for the sale of the Sale Shares and shall constitute the
            Company the Vendor's agent for the sale of the Sale Shares to the
            Shareholders (other than the Vendor).

       (b)  Upon receipt of a Transfer Notice, the Company shall forthwith offer
            the Sale Shares to all Shareholders (other than the Vendor) pro rata
            as nearly as may be in proportion to the existing numbers of Company
            Shares held by such Shareholders giving details of the name of the
            other Shareholder to whom the Vendor proposes to transfer the shares
            specified therein, the number and the Sale Price of such Sale
            Shares. The Company shall invite each such Shareholder to state in
            writing within thirty-five days from the date of the notice whether
            it is willing to purchase any of the Sale Shares so offered to it
            and if so (i) the number which it is willing to purchase and (ii)
            the maximum number of Sale Shares which it would be willing to
            purchase if other Shareholders were not willing to purchase Sale
            Shares offered to them. If at the expiration of the said period of
            thirty-five days there are any Sale Shares offered which any of such
            Shareholders have not so stated their willingness to purchase, such
            remaining shares shall be allocated pro rata as nearly as may be in
            proportion to existing numbers of Company Shares then held by such
            Shareholders as shall have indicated their willingness to purchase
            such remaining shares up to the maximum number of shares which such
            Shareholders have indicated their willingness to purchase.

       (c)  If the Company shall pursuant to the above provisions of this clause
            9.4, find a Shareholder or Shareholders willing to purchase all of
            the Sale Shares, the Vendor shall be bound upon receipt of the Sale
            Price to transfer the Sale Shares to such persons. If the Vendor
            shall make default in so doing the Company shall, if so required by
            the person or persons willing to purchase such Sale Shares, receive
            and give a good discharge for the purchase money on behalf of the
            Vendor and shall authorise some person to execute transfers of the
            Sale Shares in favour of the purchasers and shall enter the names of
            the purchasers in the Register of Members as the holder of such of
            the Sale Shares as shall have been transferred to them as aforesaid.
            If the Company shall pursuant to the above provisions of this Clause
            9.4 fail to find a Shareholder or Shareholders willing to purchase
            all of the Sale Shares, the Vendor shall not be obliged to sell any
            of the Sale Shares and shall at any time within six months after the
            offer by the Company to the Shareholders pursuant to this clause 9.4
            be at liberty to sell and transfer the Sale Shares to the
            Shareholder whose name was specified in the Transfer Notice at a
            price being not less than the Sale Price.

9.5    Pre-emption Rights:
       -------------------

       (a)  Subject to clauses 9.2, 9.3 and 9.8, a shareholder who desires to
            transfer any shares (for the purposes of this clause 9.5 the
            "Vendor") after the end of the Standstill Period shall give to the
            Company notice in writing of such desire (for the purposes of this
            clause 9.5 a "Transfer Notice"). A Vendor may only serve a Transfer
            Notice if it has first agreed (on a subject to contract basis) the
            material terms relating to that transfer (including the cash price)
            with a

                                      21
<PAGE>
 
            bona fide third party purchaser). A Transfer Notice shall specify
            the name of the person to whom the Vendor proposes to transfer the
            number and classes of shares specified therein (for the purposes of
            this clause 9.5 the "Sale Shares") in the event that they are not
            purchased pursuant to this clause 9.5, the price at which the Vendor
            proposes so to transfer (the "Sale Price"). The Transfer Notice
            shall constitute the Company the Vendor's agent for the sale of the
            Sale Shares to the other Shareholders.

       (b)  The Company shall forthwith upon receipt of a Transfer Notice offer
            the Sale Shares to all Shareholders (other than the Vendor) pro rata
            as nearly as may be in proportion to the existing numbers of Company
            Shares held by such Shareholders giving details of the identity of
            the third party purchaser, the number and the Sale Price of such
            Sale Shares. The Company shall invite each such Shareholder to state
            in writing within thirty-five days from the date of the notice
            whether it is willing to purchase any of the Sale Shares so offered
            to it and if so (i) the number which it is willing to purchase and
            (ii) the maximum number of Sale Shares which it would be willing to
            purchase if other Shareholders were not willing to purchase Sale
            Shares offered to them. If at the expiration of the said period of
            thirty-five days there are any Sale Shares offered which any of such
            Shareholders have not so stated their willingness to purchase, such
            remaining shares shall be allocated pro rata as nearly as may be in
            proportion to existing numbers of Company Shares then held by such
            Shareholders, as shall have indicated their willingness to purchase
            such remaining shares up to the maximum number of shares which such
            Shareholders shall have indicated their willingness to purchase.

       (c)  If the Company shall pursuant to the above provisions of this clause
            9.5, find a Shareholder or Shareholders willing to purchase all of
            the Sale Shares, the Vendor shall be bound upon receipt of the Sale
            Price to transfer the Sale Shares to such persons. If the Vendor
            shall make default in so doing the Company shall, if so required by
            the person or persons willing to purchase such Sale Shares, receive
            and give a good discharge for the purchase money on behalf of the
            Vendor and shall authorise some person to execute transfers of the
            Sale Shares in favour of the purchasers and shall enter the names of
            the purchasers in the Register of Members as the holder of such of
            the Sale Shares as shall have been transferred to them as aforesaid.

       (d)  If the Directors of the Company shall not have found a Shareholder
            or Shareholders willing to purchase all of the Sale Shares pursuant
            to the foregoing provisions of this clause 9.5 the Vendor shall not
            be obliged to sell any of the Sale Shares and shall, subject to
            clause 9.6, at any time within six months after the offer by the
            Company to its Shareholders pursuant to this clause 9.5 be at
            liberty to sell and transfer the Sale Shares to the person whose
            name was specified in the Transfer Notice at a price being not less
            than the Sale Price.

9.6    Take along rights:
       ------------------

       (a)  Subject to clauses 9.2, 9.3, 9.4, 9.5 and 9.8, no sale or transfer
            (whether by one or by a series of transactions) to a person or its
            Affiliates or anyone acting in concert with that person of any
            Company Shares (other than a sale or transfer to a person who is a
            Shareholder) which amounts in the aggregate to 12 1/2 per cent or
            more of the equity share capital of the Company for the

                                      22
<PAGE>
 
            time being in issue ("the Specified Shares") shall be made or
            registered without the prior consent of each Shareholder which, when
            taken together with its Affiliates, holds 15 per cent or more of the
            equity share capital of the Company at that time unless, before such
            sale or transfer is made, the proposed transferee has irrevocably
            and unconditionally offered to purchase all of the Company Shares
            for the time being in issue at the Specified Price and otherwise on
            the same terms (including as to the time of completion and the
            manner of payment) as the proposed transferee has offered to
            purchase the Specified Shares.

       (b)  In this clause 9.6, the expression "the Specified Price" shall mean
            a consideration for each of the Company Shares at least equal to the
            aggregate of that offered or paid or payable by the proposed
            transferee for each of the Specified Shares. For the purposes of
            this clause, the consideration payable for such of the Specified
            Shares shall include any amount received or receivable by the holder
            of the Specified Shares which, having regard to the substance of the
            transaction as a whole, can reasonably be regarded as an addition to
            the price paid or payable for each of the Specified Shares and, in
            the event of any disagreement about the calculation of the Specified
            Price, its calculation shall be referred to the auditors of the
            Company within seven days of the dispute arising (acting as experts
            and not as arbitrators) whose decision with respect to the Specified
            Price shall be final and binding on the parties. The parties shall
            give all reasonable assistance to the auditors of the Company in
            verifying the Specified Price, including, without limitation, the
            disclosure of all relevant documentation containing the terms of the
            transaction relating to the proposed sale of the Specified Shares.

9.7    Legends on Share Certificates: All certificates representing Company
       -----------------------------
       Shares shall bear the following legend:

            "The shares represented by this Certificate are subject to an
            agreement among Diohold Limited and its shareholders which, inter
                                                                        -----
            alia, restricts transfer of these shares and in some circumstances
            ----                                                              
            requires the transfer of these shares. Any transfer in violation of
            that agreement will be void, and any transferee is required to
            become party to that agreement."

9.8    Admission of Shareholders: No Shareholder may transfer any Company Shares
       -------------------------                                                
       to any person unless such person has first executed a deed of adherence
       in the form set out in schedule 1.

9.9    Cumulative: For the avoidance of doubt the provisions of clauses 9.1,
       ----------
       9.2, 9.3, 9.4, 9.5, 9.6 and 9.8 are cumulative and not intended to apply
       in the alternative.

9.10   The Company shall have no obligation to register the transfer of any
       Company Shares if the proposed transfer does not comply with the
       provisions of this clause 9.

10     Services Agreements with CTC and TdF; Option arrangements
       ---------------------------------------------------------

10.1   Services Agreements: Each Shareholder shall, in its capacity as 
       -------------------
       shareholder of the Company, pass resolutions and procure the passing of
       resolutions by the Directors of HSCo and do everything else necessary (in
       each case, so far as they are able by the exercise of their rights and
       powers as Shareholders so to pass, procure and/or do)

                                      23
<PAGE>
 
      to cause HSCo immediately following completion of the Acquisition
      Agreement to enter into and thereafter to perform its obligations under
      services agreements in the agreed form between HSCo and CTC and between
      HSCo and TeleDiffusion de France. TdFI undertakes immediately following
      completion of the Acquisition Agreement to procure that TeleDiffusion de
      France shall enter into and thereafter perform its obligations under its
      services agreement with HSCo. CTC undertakes immediately following
      completion of the Acquisition Agreement to enter into and thereafter to
      perform its obligations under its services agreement with HSCo.

10.2  Warrants:  Subject to the conditions precedent set out in clause 4.1.1 of
      --------                                                                 
      the Acquisition Agreement having been satisfied or waived on or before
      31st March 1997 (or such later date as all the Shareholders may agree in
      writing), each Shareholder shall, in its capacity as shareholder of the
      Company, pass resolutions and procure the passing of resolutions by the
      Directors of the Company and do everything else necessary (in each case,
      so far as they are able by the exercise of their rights and powers as
      Shareholders so to pass, procure and/or do) to cause the Company to
      execute and thereafter perform its obligations under the Warrant
      Documentation.

11    Public offerings
      ----------------

11.1  Primary Offering:  No steps shall be taken to obtain a listing or 
      ----------------   
      quotation for any shares of the Company on any stock exchange or other
      trading association with a view to offering previously unissued Company
      Shares for sale to the public unless such listing or quotation is approved
      in writing by the Special Required Majority. If the Special Required
      Majority shall give such approval, the Company and all Shareholders shall
      take such steps as the Special Required Majority may reasonably request
      including the exercise of voting rights with a view to enabling a listing
      or quotation to be obtained and previously unissued Company Shares to be
      offered to the public. If, in accordance with the foregoing provisions of
      this clause 11.1, it is decided to offer previously unissued Company
      Shares for sale to members of the public and to procure that a listing or
      quotation be obtained for shares of the Company on a stock exchange or
      other trading association, then each Shareholder shall be entitled to
      notify the Company that it wishes contemporaneously to offer all or a
      specified number of such Shareholder's Company Shares for sale to the
      public and the Company shall, at its expense, to the extent lawful, take
      all necessary steps to comply with such notice but only to the extent that
      the lead underwriters of the proposed primary offering are satisfied that
      the proposed secondary offering(s) is not likely to prejudice the
      prospects of success of the proposed primary offering. If only some of the
      Company Shares subject to a proposed secondary offering can be
      accommodated then each Shareholder's entitlement so to participate shall
      be scaled down in proportion to the number of Company Shares which each
      Shareholder had indicated a desire to sell.

11.2  Demand Listing:  At any time after the third anniversary of the date of
      --------------                                                         
      this Agreement, each Shareholder may, by written notice to the Directors
      of the Company, require the Company to prepare on behalf of such
      Shareholder a prospectus or analogous document offering all or a specified
      number of such Shareholder's Company Shares, with aggregate value at the
      estimated public offering price after deducting any commissions payable,
      or discounts allowable, to underwriters of at least the Required Minimum
      Value specified below ("Sale Shares"), for the sale to the public and
      otherwise take such steps as the Shareholder may reasonably require to
      procure the Sale Shares to be listed or quoted on a stock

                                       24
<PAGE>
 
      exchange or trading association. Such notice shall be accompanied by a
      letter from an investment bank stating that the proposed public offering
      of the Company Shares is feasible, stating the investment bank's estimate
      of the public offering price per share, after deducting any commissions
      payable, or discounts allowable, to underwriters and stating that the
      estimated price per share, after deducting any commissions payable, or
      discounts allowable, to underwriters and after the estimated expenses of
      the offering, will be not less than the comparable price per share if the
      offering were made on the London Stock Exchange. Subject only to clauses
      11.3 and 11.4 and to the foregoing criteria being satisfied, the Company
      shall comply with any such request and the other Shareholders shall (in
      their capacity as shareholders of the Company) provide such assistance as
      may be reasonably required including voting in favour of any resolutions.
      The Company shall, to the extent that it may lawfully do so, bear all
      costs incurred pursuant to the first such request by any Shareholder or
      its assignee but shall be entitled to be indemnified by the relevant
      Shareholder(s) against all costs incurred pursuant to all requests of that
      Shareholder other than the first such request. The Company shall have no
      obligation to honour a request under this clause 11.2 within 12 months
      after it has honoured another request by that Shareholder or effected a
      primary offering under clause 11.1 of this agreement. For the purposes of
      the first sentence of this clause 11.2, "Required Minimum Value" means
      (Pounds) 25,000,000.

11.3  Priority: Within 30 days after receiving a notice for a demand listing
      --------                                                              
      pursuant to clause 11.2, the Special Required Majority may elect in
      writing to effect a primary offering pursuant to clause 11.1, in which
      case the primary offering shall have priority over the demand listing.

11.4  Piggyback Rights: If a Shareholder has made a request under clause 11.2,
      ----------------                                                        
      then any other Shareholder may elect to participate in the proposed public
      offering by including such other Shareholder's Company Shares in the
      offering but shall only be entitled so to participate to the extent that
      the lead underwriters of the proposed offering are satisfied that such
      participation will not prejudice the prospects of success of the proposed
      offering. If less than all of such Company Shares of other Shareholders
      can be accommodated, then each Shareholder's participation shall be scaled
      down in proportion to the number of Company Shares each Shareholder has
      indicated a desire to include in the offering.

11.5  Indemnification:
      --------------- 

      By the Company: To the extent permitted by law, the Company will indemnify
      --------------                                                            
      and hold harmless each Shareholder requesting or joining in a public
      offering, each director and officer of such Shareholder, each person who
      controls such Shareholder, each underwriter of the shares and each person
      who controls any underwriter, against any liability, cost or expense
      arising out of or based on any actual or alleged violation of applicable
      securities laws or any false or misleading statement made by the Company
      in the prospectus or analogous offering document for the Company Shares.

11.6  Administration by the Directors of the Company: The Directors of the 
      ----------------------------------------------                      
      Company shall pass such resolutions and participate in such procedures as
      are necessary and appropriate to give effect to and administer the
      provisions of this clause 11.

11.7  Effect on this Agreement:  If the Company seeks to obtain a listing or
      ------------------------                                              
      quotation

                                       25
<PAGE>
 
      for any Company Shares, the Shareholders shall consider in good faith the
      extent (having regard to the relevant listing rules) to which the rights
      and obligations of each of them hereunder can continue to exist.

11.8  In the event of a Public Offering, the Company will use its best efforts
      (in conjunction with a mutually acceptable investment bank or banks) (but
      without having an obligation to incur any material cost or liability or
      material management time over and above that which would in any event be
      incurred in relation to such public offering), and the Shareholders will
      use their reasonable efforts to give TDFI the opportunity (whether by the
      transfer of existing shares or the issue of new shares) to maintain TDFI's
      then percentage shareholding in the Company, unless the investment bank
      advising the Company in connection with the public offering advises that
      to do so may reduce the price at which shares are offered to the public in
      the public offering.

12    Specific performance
      --------------------

12.1  The Company Shares cannot be readily purchased or sold in the open market,
      and for that reason, among others, the Company and the Shareholders will
      be irreparably damaged in the event that this Agreement is not
      specifically enforced. Accordingly each Shareholder and the Company agree
      that specific performance and injunctive relief would be appropriate
      remedies in the event of any breach or threatened breach of this
      Agreement. Without limiting the generality of the foregoing, should any
      controversy arise concerning a sale or disposition of any Company Shares,
      an injunction may be issued restraining any sale or disposition pending
      the determination of such controversy, and the resolution thereof shall be
      enforceable in a court of equity by a decree of specific performance. The
      remedies specified in this clause 12.1 shall be cumulative and not
      exclusive, and shall be in addition to any other remedies which the
      parties may have.

12.2  Each party confirms to each other party that, for the purposes of entering
      into the transactions contemplated by this Agreement:-

      (a)   it has entered into such transactions entirely on the basis of its
            own assessment of the risks and effect thereof; and

      (b)   save as expressly set out in this Agreement is owed no duty of care
            or other obligation by any other party in respect thereof; and

      (c)   in so far as it is owed any such duty or obligation as referred to
            in sub-paragraph (b) above (whether in contract, tort or otherwise)
            (save as expressly set out in this Agreement) by such other party it
            hereby waives, to the extent permitted by law, any rights which it
            may have in respect of such duty or obligation.

13    Term
      ----

13.1  Term: This Agreement shall continue in force until the earlier of the
      ----                                                                 
      following times:

      (a)   Binding on One: the date upon which only one Shareholder remains as 
            --------------  
            a party to this Agreement;

                                       26
<PAGE>
 
      (b)   Public Offer: the commencement of public trading of the Shares in
            ------------                                                     
            connection with any  Public Offering.

13.2  This Agreement shall cease and determine in respect of a Shareholder, upon
      the Shareholder ceasing to be the legal or beneficial owner of any Company
      Shares.

13.3  If the conditions precedent set out in clause 4.1.1 of the Acquisition
      Agreement shall not have been satisfied or waived on or before 31st March
      1997 (or such later date as all the Shareholders may agree in writing),
      then this Agreement shall terminate and the Shareholders shall join in
      procuring that the Company be liquidated.

13.4  Certain Rights and Obligations to Survive: Termination of this Agreement
      -----------------------------------------                               
      shall in no way affect the operation of clauses 10, 11, 12, 15, 21, 22,
      23, 24, 26, 27, 28 and 29 or any rights of any Shareholder arising from
      any happening or event prior to the date of termination of this Agreement
      and any cause of action accruing prior to that date shall survive and be
      disposed of as though the provisions of this Agreement continued in full
      force and effect. In addition, except to the extent incompatible with the
      rules of any applicable stock exchange, termination of this Agreement
      pursuant to Clause 13.1(b) shall not affect clauses 2 and 3 which shall
      continue in full force and effect until the Shareholders own or control
      the voting rights attaching to less than 50% of the total Company Shares
      in issue.

14    Warranties
      ----------

      Each party warrants to the other parties as follows:

14.1  Power to Enter into Agreement: it has the legal right and power to enter
      -----------------------------                                           
      into this Agreement and to consummate the transactions contemplated hereby
      on and subject to the terms and conditions of this Agreement, and the
      execution, delivery and performance of this Agreement by it has been duly
      and validly authorised and this Agreement is a valid and binding agreement
      enforceable in accordance with its terms; and

14.2  No Further Authorisation: no further authorisation, consent or approval of
      ------------------------                                                  
      any person is required by or in relation to it as a condition to the
      validity of this Agreement or to give effect to the transactions
      contemplated hereby.

15    Confidentiality
      ---------------

15.1  Confidentiality: Subject as provided in clause 15.4 below, all matters
      ---------------                                                       
      relating to this Agreement and the negotiations relating to this Agreement
      and all information acquired or received by any party under or in
      connection with this Agreement shall be held confidential during the
      continuance of this Agreement, and each party agrees that it shall not
      divulge any such confidential information to any third party, without the
      prior written approval of all other Shareholders provided that any party
      may, without such approval, disclose such matters or information:

      (a)   Assignees: to a bona fide intending assignee of such party upon
            ---------  
            obtaining a similar undertaking of confidentiality from such
            intending assignee;

      (b)   Professionals: to any outside professional consultants upon 
            -------------     
            obtaining a similar undertaking of confidentiality from such
            consultants;

                                       27
<PAGE>
 
      (c)   Banks etc.: to any bank or financial institution from whom such 
            ----------         
            party is seeking to obtain finance, upon obtaining a similar
            undertaking of confidentiality from such bank or institution;

      (d)   Public Domain: to the extent that the same has become generally
            -------------                                                  
            available to the public other than as a result of unauthorised
            disclosure by a party;

      (e)   Partners: in the case of a Shareholder which is a partnership, to 
            --------         
            the Shareholder's constituent partners; and

      (f)   Law/Listing Regulations: to persons or the general public if
            -----------------------                                     
            disclosure to such persons or the general public is required to
            comply with any applicable law or regulation of any country or the
            rules or regulations of the London Stock Exchange or any other
            exchange or market on which securities of a Shareholder or the
            parent corporation of a Shareholder are quoted, provided that any
            such information disclosed pursuant to this paragraph (f) shall be
            disclosed only after consultation with the other parties unless such
            consultation is prohibited or the time limits within which such
            disclosure must be made are such that consultation is impracticable.

15.2  Employees etc.: Each party shall use its reasonable endeavours to ensure
      --------------                                                          
      that those of its employees, agents, contractors and partners who are at
      any time in possession of confidential information of a kind referred to
      in clause 16.1 and the employees, agents and contractors of the Company
      and each of the Subsidiaries do not disclose or suffer or permit the
      disclosure of the same.

15.3  The Company's Confidentiality Obligation: The Company shall (and the
      ----------------------------------------                            
      Company shall procure that each of the Subsidiaries shall) observe a
      similar obligation of confidence in favour of each of the parties to this
      Agreement.

15.4  Any Shareholder may communicate any information received by it pursuant to
      this Agreement, and the Director nominated by it pursuant to clause 2.3(c)
      may communicate any information received by him pursuant to this Agreement
      or otherwise in his capacity as director of the Company, to that
      Shareholder. Any Shareholder may communicate any such information (other
      than information which relates to the business or affairs of a Shareholder
      or its Affiliates) to any company which is its subsidiary or holding
      company or a subsidiary of its ultimate holding company or to its manager
      or investment or other professional adviser or any person or persons on
      behalf of whom it holds Company Shares subject to the obligations set out
      in clause 15.2; provided that nothing in this Agreement shall require such
      disclosure unless the Director's fiduciary duty to the Company or any of
      its Subsidiaries would be breached as a result.

16    Public Announcements
      --------------------

16.1  No party shall issue or make any public announcements or statement
      regarding this Agreement, the Company's or any Subsidiary's Business or
      its involvement in the Company or with any Subsidiary unless prior thereto
      such party furnishes all Shareholders with a copy of such announcement or
      statement and obtains the approval of the other Shareholders which
      approval shall not be unreasonably withheld provided that, notwithstanding
      any failure to obtain approval, no party shall be prohibited from issuing
      or making any such public announcement or statement if it is necessary to
      do so in order to comply with any applicable law or regulation

                                       28
<PAGE>
 
     of any country or the rules or regulations of the London Stock Exchange or
     any other exchange or market on which securities of a party are CHAINMACRO
     (2 quoted, it being recognised, however that the parties will endeavour to
     ensure that any such public announcements or statements are made
     contemporaneously.

17   Further assurances
     ------------------

17.1 The parties shall each execute and deliver such further and other documents
     and instruments and do such further and other things as may be necessary to
     implement and carry out the intent of this Agreement.

18   Other agreements among shareholders
     -----------------------------------

18.1 No Existing Agreements: Each of the Shareholders represents and warrants
     ----------------------                                                  
     that as of the execution of this Agreement it is not party to any written
     or other enforceable agreement with any other Shareholder with respect to
     the subject matter of this Agreement, except for this Agreement.

18.2 Disclosure of Future Agreements: Each of the Shareholders agrees that it
     -------------------------------                                         
     will not enter into any written or other enforceable agreement with any
     other Shareholder with respect to the subject matter of this Agreement
     without first obtaining the prior written approval of all of the
     Shareholders.

18.3 Competitive Bidding:  Each of the Shareholders agrees that if it or any of
     -------------------                                                       
     its Affiliates bids or intends to bid for any contract or project in
     competition with the Company or HSCo, then:

     (a)  it will promptly disclose that fact to the other Shareholders; and

     (b)  the Company, HSCo and the other Shareholders will be entitled to
          withhold from that Shareholder and its Group and its nominated
          Director any confidential information relating to the proposed bid for
          that contract or project by the Company or HSCo.

18.4 Conflicts involving a Shareholder:  Each Shareholder agrees that neither
     ---------------------------------                                       
     it, any of its Affiliates, any of its Permitted Transferees nor its
     nominated Director will be entitled to participate in  decisions (but shall
     be entitled to participate in discussions) of the Directors of the Company
     or any Subsidiary involving:

          (a)  any claim or prospective legal proceedings by the Company or any
               Subsidiary against that Shareholder or any of its Affiliates;

          (b)  any claim or prospective legal proceedings by that Shareholder or
               any of its Affiliates against the Company or any Subsidiary;

          (c)  any bid by the Company or any Subsidiary for any contract or
               project in respect of which that Shareholder or any of its
               Affiliates intends to bid in competition with the Company or any
               Subsidiary; and

          (d)  any transaction or proposed transaction between the Company or a
               Subsidiary and a Shareholder or an Affiliate of a Shareholder.

                                       29
<PAGE>
 
          In relation to any of the circumstances set out in clause 18.4(a),
          (b), (c) or (d), the Company, any Subsidiary and the other
          Shareholders shall be entitled to withhold from that Shareholder and
          its Group and its nominated Director any confidential information
          relating thereto.

19   Subsidiaries to acknowledge agreement
     -------------------------------------

19.1 The Shareholders (in their capacity as shareholders of the Company) and the
     Company will procure Subsidiaries to acknowledge the provisions hereof and
     to agree to be bound by the same to the extent applicable, by execution of
     deeds of adherence in a form approved by resolution of the Directors of the
     Company.

20   Compliance by the Company and subsidiaries
     ------------------------------------------

     The Shareholders each undertake (in their capacity as Shareholders) to:

20.1 Exercise Voting Rights: exercise the voting rights attributable to the
     ----------------------                                                
     Company Shares which they hold; and

20.2 Cause Directors to Vote: cause the Directors of the Company and the
     -----------------------                                            
     directors of each of the Subsidiaries nominated by them respectively to
     vote;

     to ensure that the Company and each of the Subsidiaries operate in
     accordance with the provisions of this Agreement and the Finance Documents
     and so as to give full effect to the terms of this Agreement and the
     Finance Documents.

21   Modification
     ------------

21.1 No purported variation of this Agreement shall be effective unless made in
     writing and agreed by all the Shareholders.

22   Effect of waiver
     ----------------

     No waiver by any party of any default in the strict and literal performance
     or compliance with any provision, condition or requirement herein shall be
     deemed to be a waiver of strict and literal performance of and compliance
     with any other provision, condition or requirement herein nor to be a
     waiver of or in any manner release any other party from strict compliance
     with any provision, condition or requirement in the future. Nor shall any
     delay or omission by any party to exercise any right hereunder in any
     manner impair the exercise of any such right accruing to such party
     thereafter. Except when otherwise expressly stated therein, no remedy
     expressly granted herein to any party shall exclude or be deemed to exclude
     any other remedy which would otherwise be available.

23   Partial invalidity
     ------------------

     If any of the provisions of this Agreement is or becomes invalid, illegal
     or unenforceable, the validity, legality or enforceability of the remaining
     provisions shall not in any way be affected or impaired. The parties shall
     nevertheless negotiate in good faith in order to agree the terms of a
     mutually satisfactory provision, achieving as nearly as possible the same
     commercial effect to be substituted for the provision so found to be void
     or unenforceable.

                                       30
<PAGE>
 
24   Implied relationships
     ---------------------

24.1 Nothing contained in this Agreement shall be deemed or constituted to
     constitute any party a partner, agent or representative of any other party
     or to create any trust or partnership. No party shall have the authority to
     act for or to incur any obligation on behalf of any other party except as
     expressly provided in this Agreement.

25   Costs and Deal Fee
     ------------------

25.1 All reasonable costs incurred by any party in connection with the
     negotiation, preparation, execution and delivery of this Agreement and the
     acquisition of HSCo shall be borne by the Company.

25.2 The Company shall (subject to completion of the Acquisition Agreement
     taking place) pay fees at completion of the subscription for Company Shares
     set out in clause 2.4(a) to CTC,  Berkshire Partners LLC and Candover
     Partners Limited in the following amounts plus value added tax (if
     applicable):
<TABLE>
                  <S>                                 <C> 
                  CTC                                 - (Pounds)732,000
                  Berkshire Partners LLC              - (Pounds)244,000
                  Candover Partners Limited           - (Pounds)244,000
</TABLE>

26   Agreement to take priority
     --------------------------

26.1 In the event of any conflict between the provisions of this Agreement and
     the provisions of the Company's Constitution or the memorandum and articles
     of association of any Subsidiary the provisions of this Agreement shall
     take priority and apply to the exclusion of the relevant provisions of the
     Company's Constitution or the memorandum and articles of association of any
     Subsidiary. The parties shall exercise all voting and other rights and
     powers available to them so as to give effect to the provisions of this
     Agreement and shall also (if necessary) procure any required amendment to
     the Company's Constitution or the memorandum and articles of association of
     any Subsidiary as may be necessary.

27   Entire agreement
     ----------------

27.1 This Agreement (together with the Acquisition Agreement, the Financing
     Documents, the Services Agreements and the Subscription Agreement of even
     date made between T.B. Miller, Jr, D. Ivy and the parties hereto) sets out
     the entire agreement and understanding between the parties with respect to
     the subject matter hereof and supersedes any prior communications or
     correspondence with respect to the subject matter hereof. It is agreed
     that:

     (i)    no party has entered into this Agreement in reliance upon any
            representation, warranty or undertaking of any other party which is
            not expressly set out or referred to in this Agreement;

     (ii)   no party shall have any remedy in respect of misrepresentation or
            untrue statement made by any other party unless and to the extent
            that a claim lies for breach of warranty under this Agreement;

     (iii)  this clause shall not exclude any liability for fraudulent
            misrepresentation.

                                       31
<PAGE>
 
28   Governing law and jurisdiction
     ------------------------------

28.1 This Agreement shall be governed by and construed and interpreted in
     accordance with the laws of England.

28.2 Each of the Shareholders (for itself and on behalf of its respective
     holding and subsidiary companies and the directors, employees and agents of
     each of them) agrees that the English Courts shall have exclusive
     jurisdiction to hear and decide any and all claims, disputes, complaints,
     actions or proceedings ("Claims or Proceedings"), whether in contract or
     tort, which may arise at any time out of or in connection with any of the
     matters referred to in this Agreement, including, but not limited to, any
     Claim or Proceeding asserting dishonesty, improper or illegal conduct or
     breach of trust or duty or based on the effects of any of those matters in
     any jurisdiction and any Claim or Proceedings which may be material to any
     of the Shareholders but of which any of the Shareholders is unaware or does
     not suspect exists and for this purpose each of the Shareholders
     irrevocably submits to the exclusive jurisdiction of the English Courts.

28.3 CTC and Berkshire each hereby irrevocably authorise and appoint Norose
     Notices Limited (AMC/99/Z135214) (for the attention of the Director of
     Administration) at the address of its registered office for the time being
     or such other person resident in England as it may by notice to all other
     parties substitute) to accept service of all legal process arising out of
     or connected with this Agreement and service on Norose Notices Limited (or
     such substitute) shall be deemed to be service on the party concerned.

28.4 TdFI hereby irrevocably authorises and appoints Fleetside Legal
     Representative Services Limited (for the attention of Denis Stewart) at the
     address of its registered office for the time being (or such other person
     resident in England as it may by notice to all other parties substitute) to
     accept service of all legal process arising out of or connected with this
     Agreement and service on  Fleetside Legal Representative Services Limited
     (or such substitute) shall be deemed to be service on the party concerned.



29   Notices
     -------

29.1 All notices and other communications required or permitted under this
     Agreement shall be in writing and shall be delivered personally, sent by
     air courier (in the case of notices given by a party in one jurisdiction to
     a party in another), first class pre-paid post (in the case of a notice
     given by a party in one jurisdiction to a party in the same jurisdiction),
     telexed or sent by facsimile transmission (and promptly confirmed by air
     courier service in the case of notices sent from one jurisdiction to
     another and by first class pre-paid post in the case of notices sent by a
     party in one jurisdiction to another party in the same jurisdiction).  Any
     such notice shall be deemed given when so delivered personally, telexed or
     sent by facsimile transmission or air courier or first class pre-paid post
     to the parties at the following addresses (or at such other address for a
     party as shall be specified by like notice):

     Berkshire: if to Berkshire, to:
     ---------                      

     Berkshire Partners

                                       32
<PAGE>
 
     One Boston Place
     Boston, Massachusetts 02108
     USA

     Attention:  Carl Ferenbach
     Fax:    617-227-6105

     Candover: if to Candover, to:
     --------                     

     Candover Investments PLC
     20 Old Bailey
     London  EC4M 7LN

     Attention:    Douglas Fairservice
     Fax:          0171 248 5483
 
     CTC: if to CTC, to:
     ---     

     Castle Tower Holding Corporation
     510 Bering Drive
     Suite 310
     Houston
     Texas TX 77057

     Attention:  Ted B. Miller Jr.
     Fax:    713 974 1926

     TdFI: if to TdFI to:
     ----                

     TeleDiffusion de France International S.A.
     21-27 Rue Barbes
     BP 518
     92 542 Montrouge
     CEDEX
     Paris
     France
     Attention:  Michel Azibert
     Fax:    46 54 31 35

     the Company: if to the Company, to:
     -----------                        

     the Company at its registered office
     Attention:  Managing Director

30   Restrictions in the Agreement
     -----------------------------

30.1 Notwithstanding any other provision of this Agreement (or any other
     agreement which, together with this Agreement, may form part of an
     agreement for the purposes of the Restrictive Trade Practices Act 1976
     (together the "RTPA Agreement")) the parties hereto agree that they will
     not give effect, and will procure that none of their subsidiaries shall
     give effect, to any restriction or restrictions contained in the RTPA
     Agreement which cause the RTPA Agreement to be regis-

                                       33
<PAGE>
 
     trable under the Restrictive Trade Practices Act 1976 until one day after
     particulars of the RTPA Agreement shall have been furnished to the Director
     General of Fair Trading.

31   Counterparts
     ------------

     This Agreement may be executed in any number of counterparts with the same
     effect as if the signatures to each such counterpart were upon the same
     instrument.

IN WITNESS of which this agreement has been executed.

                                       34
<PAGE>
 
                                   Schedule 1
                                   ----------
                               Deed of Adherence
                               -----------------

THIS DEED OF ADHERENCE is made on                     199 (bullet)

BETWEEN:

[insert name of New Shareholder] of [insert name of company] (the "New
Shareholder") in favour of the persons whose names are set out in the schedule
to this deed and is supplemental to the Shareholders' Agreement dated (bullet)
199 (bullet) between (bullet) and others (the "Agreement").

THE PARTIES AGREE AS FOLLOWS:

1.   The New Shareholder confirms that it has read a copy of the Agreement and
     covenants with each person named in the schedule to this deed to perform
     and be bound by all the terms of the agreement as if the New Shareholder
     were named in the agreement as [a Shareholder/Berkshire/Candover/CTC/TdFI/a
     party thereto].

2.   This deed is governed by English law.

3.   [Include jurisdiction clause and agent for service clause in appropriate
     circumstances].

IN WITNESS whereof this deed has been executed by the New Shareholder and is
intended to be and is hereby delivered on the date first above written.

                                       35
<PAGE>
 
SIGNED for and on behalf of     )
BERKSHIRE FUND IV INVESTMENT    )
CORP                            )
By                              )
in the presence of:             )



SIGNED for and on behalf of     )
BERKSHIRE INVESTORS LLC         )
By                              )
in the presence of:             )



SIGNED for and on behalf of     )
BERKSHIRE PARTNERS LLC          )
By                              )
in the presence of:             )



SIGNED for and on behalf of     )
CANDOVER INVESTMENTS PLC        )
By Gavin Douglas Fairservice    )
in the presence of:             )
Deborah Poole
Broadwalk House
5, Appold Street
London EC2A ZNA/Solicitor



SIGNED for and on behalf of     )
CANDOVER (TRUSTEES) LIMITED     )
By Gavin Douglas Fairservice    )
in the presence of:             )
Deborah Poole
Broadwalk House
5, Appold Street
London EC2A ZNA/Solicitor



SIGNED for and on behalf of     )
CANDOVER PARTNERS LIMITED       )
(as general partner of the      )
Candover 1994 UK Limited        )
Partnership)                    )
By Gavin Douglas Fairservice    )
in the presence of:             )
Deborah Poole
Broadwalk House
5, Appold Street
London EC2A ZNA/Solicitor



SIGNED for and on behalf of     )
CANDOVER PARTNERS LIMITED       )
(as general partner of the      )
Candover 1994 UK No. 2 Limited  )
Partnership)                    )

                                       36
<PAGE>
 
By Gavin Douglas Fairservice    )
in the presence of:             )
Deborah Poole
Broadwalk House
5, Appold Street
London EC2A ZNA/Solicitor



SIGNED for and on behalf of     )
CANDOVER PARTNERS LIMITED       )
(as general partner of the      )
Candover 1994 US No. 1 Limited  )
Partnership)                    )
By Gavin Douglas Fairservice    )
in the presence of:             )
Deborah Poole
Broadwalk House
5, Appold Street
London EC2A ZNA/Solicitor



SIGNED for and on behalf of     )
CANDOVER PARTNERS LIMITED       )
(as general partner of the      )
Candover 1994 US No. 2 Limited  )
Partnership)                    )
By Gavin Douglas Fairservice    )
in the presence of:             )
Deborah Poole
Broadwalk House
5, Appold Street
London EC2A ZNA/Solicitor



SIGNED for and on behalf of     )
CASTLE TOWER HOLDING            )
CORPORATION                     )
By: Ted B. Miller, Jr.          )
in the presence of:             )



SIGNED for and on behalf        )
TELEDIFFUSION DE FRANCE         )
INTERNATIONAL S.A.              )
By Bruno Chetaille, Chairman    )
and CEO of T.D.F.               )
in the presence of:             )
Jean Claude Pragent,
Finance director of TDF



SIGNED for and on behalf of     )
DIOHOLD LIMITED                 )
By Ted B. Miller, Jr.           )

                                       37

<PAGE>
 
                    FIRST AMENDMENT TO AMENDED AND RESTATED
                            STOCKHOLDERS AGREEMENT

     This First Amendment to Amended and Restated Stockholders Agreement is made
by and among Crown Castle International Corp., a Delaware corporation and
previously Castle Tower Holding Corp.(the "Company"), Edward C. Hutcheson, Jr.,
Ted B. Miller, Jr., Robert A. Crown and Barbara Crown (collectively, the
"Stockholders" and individually, a "Stockholder") and the undersigned persons
listed below under Investors (collectively, the "Investors" and individually,
the "Investor"), to wit:

     WHEREAS, the Company, Stockholders and Investors are parties to an Amended
and Restated Stockholders Agreement ("Stockholders Agreement") dated August 15,
1997 relating to the imposition of certain rights, restrictions and obligations
relating to stock of the Company;

     WHEREAS, the Company, Stockholders and Investors desire to amend Sections
3.01(a), 5.03, 5.19 and 7.01(a) of the Stockholders Agreement and add a Section
3.05 to the Stockholders Agreement relating to the name of the Company and its
principal subsidiary in the United States; and

     WHEREAS, the Company, Stockholders and Investors desire to evidence such
Agreement in writing.

     NOW, THEREFORE, the Company, Stockholders and Investors, for good and
valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, agree as follows:

     (1)  Section 3.01 of the Stockholders Agreement is amended to change the
target minimum ownership percentage in such section from "5%" to "2 1/2%" and
shall read as follows:

          "Section 3.01.  Designation of Nominees by Crowns and by Investors.
                          --------------------------------------------------  
     (a) So long as the Crowns or their transferees under Section 2.01(b) and
     (c) (the "Crown Related Transferees") shall have in the aggregate a 2 1/2%
               -------------------------                                       
     or greater interest in the Common Stock of the Company, Robert A. Crown,
     Barbara Crown and/or the Crown Related Transferees (collectively, the
                                                                          
     "Nominating Group" and, individually, a "Nominating Person") shall have the
     -----------------                        -----------------                 
     right to designate one nominee for election as a director of the Company (a
     "Crown Nominee").  At least ten days prior to any meeting, or written
      -------------                                                       
     action in lieu of a meeting, of Stockholders of the Company at or by which
     directors are to be elected, the Nominating Group or a Nominating Person
     shall notify the Company and the Investors in writing of the Crown Nominee
     designated by the Nominating Group or a Nominating Person for election as a
     director.  In the absence of any such notification, it shall be presumed
     that the then incumbent Crown Nominee has been redesignated as the Crown
     Nominee.  In the event that no such nomination is made by the Nominating
     Group and either (i) no then incumbent Crown Nominee exists or (ii) the
     then incumbent Crown Nominee does not intend to serve as a director of the
     Company for the upcoming year, Robert A. Crown shall be nominated for
     election without any further action.  The initial Crown Nominee is Robert
     A. Crown."

     (2) Section 3.05 relating to the "Crown Castle" and "Crown Communication
Inc." names is added to the Stockholders Agreement and shall read as follows:

     "3.05  Company Name.  So long as the Crowns or the Crown Related
            ------------                                             
     Transferees shall have in the aggregate a 2 1/2% or greater interest in the
     Common Stock or they otherwise consent in writing, the Company covenants
     and agrees (subject to the limitations below) to use its best efforts to
     (i) retain a name beginning with "Crown Castle", (ii) retain or cause the
     name of its principal Affiliate owning communication towers in the United
     States to be "Crown Communication Inc.", and (iii) upon a merger,
     consolidation, amalgamation, roll-up or any other transaction with a
     similar effect involving the Company (including, without limitation, 
<PAGE>
 
     a merger or roll-up involving Castle Transmission Services (Holdings) Ltd.
     or any of its Affiliates), to cause the successor or surviving entity to
     retain or have a name beginning with "Crown Castle". Notwithstanding the
     above, the above covenants and agreement shall not (a) require the Company
     (including any successor entity), any stockholder of the Company or member
     of the Board to incur any costs, expenses or losses of any nature or amount
     including, without limitation, losses relating to a potential corporate
     opportunity or foregone stockholder value (price, content or any other
     item), (b) prevent or delay the Company (including any successor entity)
     from consummating or negotiating any proposed transaction or (c) require
     any member of the Board to breach any duty and obligation to the Company or
     its stockholders. Consent of the Crowns and the Crown Related Transferees
     shall be deemed given if written consent is obtained from the Crowns and
     the Crown Related Transferees holding more than 50% of the Common Stock
     held by such persons at the time of determination."

     (3)  Section 5.03 of the Stockholders Agreement is amended to delete the
requirement to obtain life insurance on the life of David L. Ivy and shall read
as follows:

          "Section 5.03 Properties, Business, Insurance.  The Company shall
                        -------------------------------                    
     maintain and cause each of its Subsidiaries to maintain as to their
     respective properties and business, with financially sound and reputable
     insurers, insurance against such casualties and contingencies and of such
     types and in such amounts as is customary for companies similarly situated,
     which insurance shall be deemed by the Company to be sufficient.  The
     Company shall also maintain in effect "key person" life insurance policies,
     payable to the Company, on the life of each of Ted B. Miller, Jr. and
     Robert A. Crown (so long as each remains an employee of the Company), in
     the amount of $2,000,000 each.  The Company shall not cause or permit any
     assignment or change in beneficiary and shall not borrow against any such
     policy.  If requested by the Purchasers holding at least a majority of the
     outstanding Preferred Shares, the Company will add one designee of such
     Purchasers as a notice party for each such policy and shall request that
     the issuer of each policy provide such designee with ten days' notice
     before such policy is terminated (for failure to pay premiums or otherwise)
     or assigned or before any change is made in the beneficiary thereof."

     (4)  Section 5.19 of the Stockholders Agreement is amended to include a
reservation of shares of Senior Convertible Preferred Stock of the Company
issuable as dividends pursuant to paragraph 3 of Section II of Article Fourth of
the Certificate of Incorporation of the Company as amended by the Certificate of
Amendment of Certificate of Incorporation filed October 31, 1997 and shall read
as follows:

          "Section 5.19 Reserve for Shares Issued Upon Conversion or as Stock
                        -----------------------------------------------------
     Dividends. The Company shall at all times reserve and keep available out of
     ---------                                                                  
     its authorized but unissued shares of Class B Stock and Senior Convertible
     Preferred Stock, for the purpose of effecting the conversion of the
     Preferred Shares and the distribution of stock dividends on the Senior
     Convertible Preferred Stock and otherwise to comply with the terms of this
     Agreement, such number of its duly authorized shares of Common Stock and
     Senior Convertible Preferred Stock as shall be sufficient to effect the
     conversion of the Preferred Shares from time to time outstanding and stock
     dividend distributions on the Senior Convertible Preferred Stock from time
     to time outstanding or otherwise to comply with the terms of this
     Agreement.  If at any time the number of authorized but unissued shares of
     Common Stock and Senior Convertible Preferred Stock shall not be sufficient
     to effect the conversion or distribution of or otherwise to comply with the
     terms of this Agreement, the Company will forthwith take such corporate
     action as may be necessary to increase its authorized but unissued shares
     of Common Stock and Senior Convertible Preferred Stock, as applicable, to
     such number of shares as shall be sufficient for such purposes.  The
     Company will obtain any authorization, consent, approval or other action
     by, or make any filing with, any court or administrative body that may be
     required under applicable state securities laws in connection with the
     issuance of shares of Common Stock upon conversion of the Preferred Shares
     and the issuance of shares of Senior 


                                      -2-
<PAGE>
 
     Convertible Preferred Stock upon stock dividend distributions relating to
     Senior Convertible Preferred Stock."

     (5)  Section 7.01 of the Stockholders Agreement is amended to change the
target minimum ownership percentage from "5%" to "2 1/2%" and shall read as
follows:

          "Section 7.01.  Term.  Other than (a) Section 3.01(a), (c), (e) and
                          ----                                               
     Section 3.05, which shall continue in effect for so long as the Crowns or
     the Crown Related Transferees shall have in the aggregate a 2 1/2% or
     greater interest in the Common Stock of the Company and (b) Article VI
     hereof, this Agreement shall terminate immediately prior to the
     consummation of the first firm commitment underwritten public offering
     pursuant to an effective registration statement on Form S-1 (or its then
     equivalent) under the Securities Act, which offering has been approved by a
     majority of the Board (including the approval of at least 66 2/3% of the
     directors nominated by the holders of the Preferred Shares and the
     Nominating Group, considered as a group)."

     (6)  The Stockholder Agreement shall continue in full force and effect
except as amended by this First Amendment to the Stockholders Agreement.
 


                                      -3-
<PAGE>
 
     EXECUTED effective the 28th day of January, 1998, in multiple originals and
counterparts.

 
                         COMPANY:

                         CROWN CASTLE INTERNATIONAL CORP.

                         By: /s/ David L. Ivy
                            --------------------------------------------
                         Name: David L. Ivy
                              ------------------------------------------
                         Title: President
                               -----------------------------------------


                         STOCKHOLDERS:

                                /s/ Ted B. Miller, Jr.
                         -----------------------------------------
                                    Ted B. Miller, Jr.

                                /s/ Edward C. Hutcheson, Jr.
                         -----------------------------------------
                                    Edward C. Hutcheson, Jr.

                                /s/ Robert A. Crown
                         -----------------------------------------
                                    Robert A. Crown

                                /s/ Barbara A. Crown
                         -----------------------------------------
                                    Barbara A. Crown


                         INVESTORS:

                         BERKSHIRE FUND III, A Limited Partnership
                              By:   Third Berkshire Associates LP

                              By:   /s/ Garth H. Greimann
                                 ---------------------------------------
                                    Managing Member of Third Berkshire
                                    Managers LLC, the General Partner of
                                    Third Berkshire Associates LP, the
                                    general partner of Berkshire Fund III,
                                    A Limited Partnership.


                                      -4-
<PAGE>
 
                         BERKSHIRE FUND IV, Limited Partnership
                              By:   Fourth Berkshire Associates LLC
                                         General Partner
 
                              By: /s/ Garth H. Greimann
                                  -------------------------------------
                                      Garth H. Greimann, Managing Director


                         BERKSHIRE INVESTORS LLC

                         By:  /s/ Garth H. Greimann
                            ---------------------------------------------
                              a Managing Member


                         CENTENNIAL FUND IV, L.P.
                              By:   Centennial Holdings V, L.P., its
                                         General Partner

                              By: /s/ David C. Hull, Jr.
                                  ----------------------------------
                              Print: David C. Hull, Jr., General Partner


                         CENTENNIAL FUND V, L.P.
                              By:  Centennial Holdings V, L.P.,
                                         its General Partner

                              By: /s/ David C. Hull, Jr.
                                  ----------------------------------
                              Print: David C. Hull, Jr., General Partner

                         NASSAU CAPITAL PARTNERS II L.P.
                              By: Nassau Capital L.L.C.                    
                                         its General Partner

                                    By: /s/ Randall A. Hack
                                       ---------------------------------
                                         Randall A. Hack, Member


                         NAS PARTNERS I L.L.C.

                              By: /s/ Randall A. Hack
                                 ---------------------------------------
                                    Randall A. Hack, Member

                         FAY, RICHWHITE COMMUNICATIONS LIMITED

                         By: /s/ David Richwhite
                             ----------------------------------------   
                                    ____________________, 


                         PNC VENTURE CORP.

                         By: /s/ David McL. Hillman
                            --------------------------------------------
                         Print: David McL. Hillman
                               -----------------------------------------
                         Title: Exec VP
                               -----------------------------------------








                                      -5-
<PAGE>

                         AMERICAN HOME ASSURANCE COMPANY



 
                         By: /s/ David B. Pinkerton
                            --------------------------------------------
                         Name: David B. Pinkerton
                              ------------------------------------------
                         Title: Vice President
                               -----------------------------------------


                         NEW YORK LIFE INSURANCE COMPANY

                         By: /s/ Steven M. Benevento
                            --------------------------------------------
                         Name: Steven M. Benevento
                              ------------------------------------------
                         Title: Director
                               -----------------------------------------

                         THE NORTHWESTERN MUTUAL LIFE
                         INSURANCE COMPANY

                         By: /s/ A. Kipp Koester
                            --------------------------------------------
                         Name: A. Kipp Koester
                              ------------------------------------------
                         Title: Its authorized representative
                               -----------------------------------------

                         HARVARD PRIVATE CAPITAL HOLDINGS, INC.

                         By: /s/ Tim R. Palmer
                            --------------------------------------------
                         Name:  Tim R. Palmer
                              ------------------------------------------
                         Title: Authorized Signatory

                         By: /s/ Michael R. Eisenson
                            --------------------------------------------
                         Name: Michael R. Eisenson
                              ------------------------------------------
                         Title: Authorized Signatory


                         PRIME VIII, LP
                         By: Prime SKA I, LLC
                              its General Partner

                         By: /s/ R.W. Hughes
                            --------------------------------------------
                         Name:  R.W. Hughes
                              ------------------------------------------
                         Title: Managing Director
                               -----------------------------------------

                                /s/ Robert F. McKenzie
                         -----------------------------------------------
                                    Robert F. McKenzie

                                /s/ J. Landis Martin
                         -----------------------------------------------
                                    J. Landis Martin





                                      -6-

<PAGE>
 
                                                                    EXHIBIT 12.1
 
                        CROWN CASTLE INTERNATIONAL CORP.
 
               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
 
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                    PRO FORMA
                              YEARS ENDED    NINE MONTHS ENDED    TWELVE MONTHS
                             DECEMBER 31,      SEPTEMBER 30,          ENDED
                             --------------  -------------------  SEPTEMBER 30,
                              1995    1996     1996      1997         1997
                             ------  ------  --------  ---------  -------------
<S>                          <C>     <C>     <C>       <C>        <C>
Computation of Earnings:
 Income (loss) before income
  taxes..................... $  (21) $ (947) $   (555) $  (6,104)   $(17,816)
 Add:
  Fixed charges (as computed
   below)...................  1,214   1,912     1,312      4,592      18,616
  Equity in losses of uncon-
   solidated affiliate......    --      --        --       1,189       2,346
                             ------  ------  --------  ---------    --------
                             $1,193  $  965  $    757  $    (323)   $  3,146
                             ======  ======  ========  =========    ========
Computation of Fixed
 Charges:
 Interest expense........... $1,101  $1,748  $  1,189  $   4,256    $    600
 Amortization of deferred
  financing costs...........     36      55        40        112      17,320
 Interest component of oper-
  ating lease expense.......     77     109        83        224         696
                             ------  ------  --------  ---------    --------
                             $1,214  $1,912  $  1,312  $   4,592    $ 18,616
                             ======  ======  ========  =========    ========
Ratio of Earnings to Fixed
 Charges....................    --      --        --         --          --
                             ======  ======  ========  =========    ========
Fixed Charge Coverage Defi-
 ciency..................... $   21  $  947  $    555  $   4,915    $ 15,470
                             ======  ======  ========  =========    ========
</TABLE>

<PAGE>
 
                                                                    EXHIBIT 12.2
 
                              CROWN COMMUNICATIONS
 
               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
 
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                      SIX MONTHS
                                                                        ENDED
                                                                       JUNE 30,
                                                                         1997
                                                                      ----------
<S>                                                                   <C>
Computation of Earnings:
  Income before income taxes.........................................   $4,741
  Add: Fixed charges (as computed below).............................    1,024
                                                                        ------
                                                                        $5,765
                                                                        ======
Computation of Fixed Charges:
  Interest expense...................................................   $  774
  Interest component of operating lease expense......................      250
                                                                        ------
                                                                        $1,024
                                                                        ======
Ratio of Earnings to Fixed Charges...................................     5.63x
                                                                        ======
</TABLE>

<PAGE>
 
                                                                      Exhibit 21

               Subsidiaries of Crown Castle International Corp.
               ------------------------------------------------

I.   Crown Castle International Corp. (Delaware) owns 100% of Crown
     Communication Inc. (Delaware).

     A.  Crown Communication Inc. owns 100% of the following entities:

           1.  Crown Network Systems, Inc. (Pennsylvania).

           2.  Crown Mobile Systems, Inc. (Pennsylvania).

           3.  Spectrum Site Management Corporation (Delaware).
 
           4.  Crown Castle International Corp. de Puerto Rico (Puerto Rico).

           5.  TEA Group Incorporated (Georgia), which in turn owns 100% of the 
               following entity:
 
               a.  TeleStructures, Inc. (Georgia).

           6.  Crown Communication New York, Inc. (Delaware).

           7.  Crown Communication Virginia, Inc. (Delaware).

           8.  Crown Communication Missouri, Inc. (Delaware).

II.  Crown Castle International Corp. owns 34.3% of Castle Transmission Services
     (Holdings) Ltd (England and Wales) ("CTSH").

     A.   CTSH owns 100% of the following entity:

          1.  Castle Transmission International Ltd. (England and Wales), which 
              in turn owns 100% of the following entities:

              a.  Castle Transmission (Finance) plc (England and Wales).

              b.  Castle Transmission International Pension Trust Ltd (England 
                  and Wales).

III. Crown Castle International Corp. owns 99% of Crown Castle do Brasil Ltd. 
     (Brazil).


<PAGE>
 
                                                                   EXHIBIT 23.1
 
The Board of Directors
Crown Castle International Corp.:
 
  The audits referred to in our report dated March 19, 1997, included the
related financial statement schedule as of December 31, 1995 and 1996, and for
each of the years in the two-year period ended December 31, 1996, included in
the Registration Statement. This financial statement schedule is the
responsibility of the Company's management. Our responsibility is to express
an opinion on this financial statement schedule based on our audits. In our
opinion, such financial statement schedule, when considered in relation to the
basic consolidated financial statements taken as a whole, presents fairly in
all material respects the information set forth therein.
 
  We consent to the use of our reports included herein and to the reference to
our firm under the heading "Experts" in the Prospectus.
 
KPMG Peat Marwick LLP
 
Houston, Texas
January 7, 1998

<PAGE>
 
                                                                   EXHIBIT 23.2
 
                                    CONSENT
 
  We consent to the reference to our firm under the caption "Experts" and to
the use of our report dated February 28, 1996, with respect to the financial
statements of TEA Group Incorporated included in the Registration Statement
and related Prospectus of Crown Castle International Corp. for the
registration of $251,000,000 of 10 5/8% Senior Discount Rate Notes due 2007.
 
                                          Ernst & Young
 
Atlanta, Georgia
January 6, 1998

<PAGE>
 
                                                                      EXHIBIT 25

                      SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON,  D. C.  20549
                          __________________________

                                   FORM  T-1

                            STATEMENT OF ELIGIBILITY
                    UNDER THE TRUST INDENTURE ACT OF 1939 OF
                   A CORPORATION DESIGNATED TO ACT AS TRUSTEE
                           __________________________

                    UNITED STATES TRUST COMPANY OF NEW YORK
              (Exact name of trustee as specified in its charter)

               New York                                13-3818954
      (Jurisdiction of incorporation               (I. R. S. employer
      if not a U. S. national bank)                identification No.)

           114 West 47th Street                         10036-1532
           New York,  New York                          (Zip Code)
          (Address of principal      
            executive offices)       

                           __________________________
                        CROWN CASTLE INTERNATIONAL CORP.
               (Exact name of ISSUER as specified in its charter)

                 Delaware                              76-0470458
      (State or other jurisdiction of              (I. R. S. Employer
      incorporation or organization)               Identification No.)
 
               510 Bering Drive                           77057
                  Suite 500                            (Zip code)
                 Houston, TX           
           Telephone  (713) 570-3000   

    (Address, including zip code, and telephone number, including area code,
                  of guarantor's principal executive offices)

                           __________________________
                     10 5/8% Senior Discount Notes due 2007
                      (Title of the indenture securities)

================================================================================
<PAGE>
 
                                     - 2 -

                                    GENERAL


1.   GENERAL INFORMATION
     -------------------

     Furnish the following information as to the trustee:

     (a)  Name and address of each examining or supervising authority to which
          it is subject.

             Federal Reserve Bank of New York (2nd District), New York, New York
               (Board of Governors of the Federal Reserve System)
             Federal Deposit Insurance Corporation, Washington, D.C.
             New York State Banking Department, Albany, New York

     (b)     Whether it is authorized to exercise corporate trust powers.

             The trustee is authorized to exercise corporate trust powers.

2.   AFFILIATIONS WITH THE OBLIGOR
     -----------------------------

     If the obligor is an affiliate of the trustee, describe each such
     affiliation.

          None

3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 and 15:

     Crown Castle International Corp. currently is not in default under any of
     its outstanding securities for which United States Trust Company of New
     York is Trustee. Accordingly, responses to Items 3, 4, 5, 6, 7, 8, 9, 10,
     11, 12, 13, 14 and 15 of Form T-1 are not required under General
     Instruction B.


16.  LIST OF EXHIBITS
     ----------------

     T-1.1   --   Organization Certificate, as amended, issued by the State of
                  New York Banking Department to transact business as a Trust
                  Company, is incorporated by reference to Exhibit T-1.1 to Form
                  T-1 filed on September 15, 1995 with the Commission pursuant
                  to the Trust Indenture Act of 1939, as amended by the Trust
                  Indenture Reform Act of 1990 (Registration No. 33-97056).

     T-1.2   --   Included in Exhibit T-1.1.

     T-1.3   --   Included in Exhibit T-1.1.
<PAGE>
 
                                     - 3 -

16.  LIST OF EXHIBITS
     ----------------
     (cont'd)

     T-1.4   --   The By-Laws of United States Trust Company of New York, as
                  amended, is incorporated by reference to Exhibit T-1.4 to Form
                  T-1 filed on September 15, 1995 with the Commission pursuant
                  to the Trust Indenture Act of 1939, as amended by the Trust
                  Indenture Reform Act of 1990 (Registration No. 33-97056).

     T-1.6   --   The consent of the trustee required by Section 321(b) of the
                  Trust Indenture Act of 1939, as amended by the Trust Indenture
                  Reform Act of 1990.

     T-1.7   --   A copy of the latest report of condition of the trustee
                  pursuant to law or the requirements of its supervising or
                  examining authority.


NOTE
====

As of February 4, 1998, the trustee had 2,999,020 shares of Common Stock
outstanding, all of which are owned by its parent company, U.S. Trust
Corporation.  The term "trustee" in Item 2, refers to each of United States
Trust Company of New York and its parent company, U. S. Trust Corporation.

In answering Item 2 in this statement of eligibility as to matters peculiarly
within the knowledge of the obligor or its directors, the trustee has relied
upon information furnished to it by the obligor and will rely on information to
be furnished by the obligor and the trustee disclaims responsibility for the
accuracy or completeness of such information.

                               __________________

Pursuant to the requirements of the Trust Indenture Act of 1939, the trustee,
United States Trust Company of New York, a corporation organized and existing
under the laws of the State of New York, has duly caused this statement of
eligibility to be signed on its behalf by the undersigned, thereunto duly
authorized, all in the City of New York, and State of New York, on the 4th day
of February, 1998.

UNITED STATES TRUST COMPANY
     OF NEW YORK, Trustee

By:  /s/ Margaret Ciesmelewski
     ------------------------------
     Margaret Ciesmelewski
     Assistant Vice President
<PAGE>
 
                                                         EXHIBIT T-1.6
                                                         -------------

       The consent of the trustee required by Section 321(b) of the Act.

                    United States Trust Company of New York
                              114 West 47th Street
                              New York, NY  10036


September 1, 1995



Securities and Exchange Commission
450 5th Street, N.W.
Washington, DC  20549

Gentlemen:

Pursuant to the provisions of Section 321(b) of the Trust Indenture Act of 1939,
as amended by the Trust Indenture Reform Act of 1990, and subject to the
limitations set forth therein, United States Trust Company of New York ("U.S.
Trust") hereby consents that reports of examinations of U.S. Trust by Federal,
State, Territorial or District authorities may be furnished by such authorities
to the Securities and Exchange Commission upon request therefor.



Very truly yours,


UNITED STATES TRUST COMPANY
     OF NEW YORK

By:  /s/ Gerard F. Ganey
     __________________________   
     Senior Vice President
<PAGE>
 
                                                                   EXHIBIT T-1.7

                    UNITED STATES TRUST COMPANY OF NEW YORK
                      CONSOLIDATED STATEMENT OF CONDITION
                               SEPTEMBER 30, 1997
                               ------------------
                                ($ IN THOUSANDS)

<TABLE>
<S>                                                              <C>       
ASSETS
- ------
Cash and Due from Banks                                          $  116,582
                                                                           
Short-Term Investments                                              183,652
                                                                           
Securities, Available for Sale                                      691,965
                                                                           
Loans                                                             1,669,611
Less:  Allowance for Credit Losses                                   16,067
                                                                 ----------
     Net Loans                                                    1,653,544
Premises and Equipment                                               61,796
Other Assets                                                        125,121
                                                                 ----------
     TOTAL ASSETS                                                $2,832,660
                                                                 ==========
                                                                           
LIABILITIES                                                                
- -----------                                                                
Deposits:                                                                  
     Non-Interest Bearing                                        $  541,619
     Interest Bearing                                             1,617,028
                                                                 ----------
         Total Deposits                                           2,158,647
                                                                           
Short-Term Credit Facilities                                        365,235
Accounts Payable and Accrued Liabilities                            141,793
                                                                 ----------
     TOTAL LIABILITIES                                           $2,665,675
                                                                 ==========
                                                                           
STOCKHOLDER'S EQUITY                                                       
- --------------------                                                       
Common Stock                                                         14,995
Capital Surplus                                                      49,542
Retained Earnings                                                    99,601
Unrealized Gains (Losses) on Securities                                    
     Available for Sale, Net of Taxes                                 2,847
                                                                 ----------
TOTAL STOCKHOLDER'S EQUITY                                          166,985
                                                                 ----------
    TOTAL LIABILITIES AND                                                  
     STOCKHOLDER'S EQUITY                                        $2,832,660
                                                                 ========== 
</TABLE>

I, Richard E. Brinkmann, Senior Vice President & Comptroller of the named bank
do hereby declare that this Statement of Condition has been prepared in
conformance with the instructions issued by the appropriate regulatory authority
and is true to the best of my knowledge and belief.

Richard E. Brinkmann, SVP & Controller

November 13, 1997

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
Company's consolidated balance sheet and consolidated statement of operations
and is qualified in its entirety by reference to such consolidated financial
statements together with the related footnotes thereto.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               DEC-31-1996
<EXCHANGE-RATE>                                      1
<CASH>                                           7,343
<SECURITIES>                                         0
<RECEIVABLES>                                      872
<ALLOWANCES>                                        32
<INVENTORY>                                          0
<CURRENT-ASSETS>                                 9,413
<PP&E>                                          28,722
<DEPRECIATION>                                   1,969
<TOTAL-ASSETS>                                  41,226
<CURRENT-LIABILITIES>                            1,745
<BONDS>                                         21,912
                                0
                                     15,550
<COMMON>                                             6
<OTHER-SE>                                       (216)
<TOTAL-LIABILITY-AND-EQUITY>                    41,226
<SALES>                                              0
<TOTAL-REVENUES>                                 6,207
<CGS>                                                0
<TOTAL-COSTS>                                    1,300
<OTHER-EXPENSES>                                 4,244
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,803
<INCOME-PRETAX>                                  (947)
<INCOME-TAX>                                        10
<INCOME-CONTINUING>                              (957)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     (957)
<EPS-PRIMARY>                                        0
<EPS-DILUTED>                                        0
        


</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
Company's consolidated balance sheet and consolidated statement of operations
and is qualified in its entirety by reference to such consolidated financial
statements together with the related footnotes thereto.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               SEP-30-1997
<EXCHANGE-RATE>                                      1
<CASH>                                          13,095
<SECURITIES>                                         0
<RECEIVABLES>                                    8,255
<ALLOWANCES>                                       167
<INVENTORY>                                      1,098
<CURRENT-ASSETS>                                23,344
<PP&E>                                          73,418
<DEPRECIATION>                                   3,563
<TOTAL-ASSETS>                                 308,395
<CURRENT-LIABILITIES>                           85,613
<BONDS>                                         51,036
                           29,761
                                     92,801
<COMMON>                                            21
<OTHER-SE>                                      47,599
<TOTAL-LIABILITY-AND-EQUITY>                   308,395
<SALES>                                              0
<TOTAL-REVENUES>                                19,411
<CGS>                                                0
<TOTAL-COSTS>                                    8,609
<OTHER-EXPENSES>                                11,790
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               4,368
<INCOME-PRETAX>                                (6,104)
<INCOME-TAX>                                        46
<INCOME-CONTINUING>                            (6,150)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (6,150)
<EPS-PRIMARY>                                        0
<EPS-DILUTED>                                        0
        


</TABLE>

<PAGE>

                                                                    EXHIBIT 99.1
 
                             LETTER OF TRANSMITTAL
 
                       CROWN CASTLE INTERNATIONAL CORP.
 
                       OFFER TO EXCHANGE ITS REGISTERED
                    10 5/8% SENIOR DISCOUNT NOTES DUE 2007,
              FOR UP TO $251,000,000 PRINCIPAL AMOUNT AT MATURITY
           OF ITS OUTSTANDING 10 5/8% SENIOR DISCOUNT NOTES DUE 2007
 
                  PURSUANT TO THE PROSPECTUS, DATED    , 1998
 
 
 THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M. NEW YORK CITY TIME, ON    ,
 UNLESS EXTENDED (THE "EXPIRATION DATE"). TENDERS MAY BE WITHDRAWN PRIOR TO
 5:00 P.M.,
 NEW YORK CITY TIME, ON THE EXPIRATION DATE.
 
 
     By Mail:
 
                      By Overnight
                        Courier:
 
                                            By Hand:
 
                                                              By Facsimile:
 
   United States      United States       United States    Fax No. (212) 420-
   Trust Company      Trust Company       Trust Company           6152
    of New York        of New York         of New York        (For Eligible
   P.O. Box 844    770 Broadway, 13th     111 Broadway,    Institutions Only)
  Cooper Station          Floor            Lower Level         Confirm by
   New York, NY    New York, NY 10003  New York, NY 10006      telephone:
    10276-0844       Attn: Corporate     Attn: Corporate      Telephone No.
                    Trust Operations     Trust Services      (800) 548-6565
                       Department
 
  (registered or
  certified mail
   recommended)
 
 
 
  Delivery of this instrument to an address other than as set forth above, or
transmission of instructions via facsimile other than as set forth above, will
not constitute a valid delivery.
 
  The undersigned acknowledges that he or she has received the Prospectus,
dated         (the "Prospectus"), of Crown Castle International Corp., a
Delaware corporation (the "Company"), and this Letter of Transmittal (this
"Letter"), which together constitute the Company's offer (the "Exchange
Offer") to exchange a principal amount at maturity of up to $251,000,000 of 10
5/8% Senior Discount Notes due 2007 (the "New Notes") of the Company for an
equal principal amount at maturity of the Company's outstanding 10 5/8% Senior
Discount Notes due 2007 (the "Old Notes"). The New Notes and the Old Notes are
collectively referred to herein as the "Notes."
 
  For each Old Note accepted for exchange, the holder of such Old Note will
receive a New Note having a principal amount at maturity equal to that of the
surrendered Old Note. The Accreted Value (as defined in the Prospectus) of the
New Notes will be calculated from the original date of issuance of the Old
Notes. The New Notes will accrete daily at a rate of 10.625% per annum,
compounded semiannually, to an aggregate principal amount at maturity of
$251,000,000 by November 15, 2002. Cash interest will not accrue on the New
Notes prior to November 15, 2002. Thereafter, cash interest on the New Notes
will accrue and be payable semiannually in arrears on each May 15 and November
15, commencing May 15, 2003, at a rate of 10.625% per annum. If (i) the
Company is required to file a shelf registration statement with respect to the
Old Notes (the "Shelf Registration Statement") and has not filed such Shelf
Registration Statement on or prior to 45 days after such filing obligation
arises; or (ii) the Shelf Registration Statement has been declared effective
on or prior to 90 days after such filing obligation arises (the "Effectiveness
Target Date"); or (iii) the Company fails to consummate the Exchange Offer
within 30 days of the Effectiveness Target Date; or (iv) the Shelf
Registration Statement is declared effective but thereafter ceases to be
effective or usable in connection with resales of Transfer Restricted
Securities (as defined in the Prospectus) during the periods specified (each
such event referred to in clauses (i) through (iv) a "Registration Default"),
then commencing on the day after the occurrence of such Registration Default,
the Company will pay additional interest to each holder of Notes (each, a
"Holder"), with respect to the first 90-day period immediately following the
occurrence of the first Registration Default in an amount equal to $.05 per
week per $1,000 of the Accreted Value of the Notes held by such Holder (such
additional interest being herein called "Liquidated Damages"). The amount of
the Liquidated Damages will increase by an additional
<PAGE>
 
$.05 per week per $1,000 of the Accreted Value of the Notes with respect to
each subsequent 90-day period until all Registration Defaults have been cured,
up to a maximum amount of Liquidated Damages for all Registration Defaults of
$.50 per week per $1,000 of the Accreted Value of the Notes. Following the
cure of all Registration Defaults, the accrual of Liquidated Damages will
cease.
 
  The Company reserves the right, at any time or from time to time, to extend
the Exchange Offer at its discretion, in which event the term "Expiration
Date" shall mean the latest time and date to which the Exchange Offer is
extended. The Company shall notify the holders of the Old Notes of any
extension as promptly as practicable by oral or written notice thereof.
 
  This Letter is to be completed by a holder of Old Notes either if
certificates are to be forwarded herewith or if a tender of Old Notes, if
available, is to be made by book-entry transfer to the account maintained by
the Exchange Agent at The Depository Trust Company (the "Book-Entry Transfer
Facility") pursuant to the procedures set forth in "The Exchange Offer"
section of the Prospectus. Holders of Old Notes whose certificates are not
immediately available, or who are unable to deliver their certificates or
confirmation of the book-entry tender of their Old Notes into the Exchange
Agent's account at the Book-Entry Transfer Facility (a "Book-Entry
Confirmation") and all other documents required by this Letter to the Exchange
Agent on or prior to the Expiration Date, must tender their Old Notes
according to the guaranteed delivery procedures set forth in "The Exchange
Offer--Guaranteed Delivery Procedures" section of the Prospectus. See
Instruction 1. Delivery of documents to the Book-Entry Transfer Facility does
not constitute delivery to the Exchange Agent.
 
  The undersigned has completed the appropriate boxes below and signed this
Letter to indicate the action the undersigned desires to take with respect to
the Exchange Offer.
 
<PAGE>
 
  List below the Old Notes to which this Letter relates. If the space provided
below is inadequate, the certificate numbers and principal amount at maturity
of Old Notes should be listed on a separate signed schedule affixed hereto.
 
                           DESCRIPTION OF OLD NOTES
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                   1                  2
NAME(S) AND
ADDRESS(ES)
    OF
REGISTERED                         PRINCIPAL
 HOLDER(S)                          AMOUNT
  (PLEASE       CERTIFICATE      AT MATURITY OF
FILL IN, IF  NUMBER(S) OF OLD        NOTES
  BLANK)      NOTES TENDERED*     TENDERED**
- -----------------------------------------------
 
 
 
 
<S>          <C>               <C>
             TOTAL
</TABLE>
- -------------------------------------------------------------------------------
  * Need not be completed if Old Notes are being tendered by book-entry
    transfer.
 ** Old Notes tendered hereby must be in denominations of principal amount
    at maturity of $1,000 and any integral multiple thereof. See Instruction
    1.
 
[_]CHECK HERE IF TENDERED OLD NOTES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER
   MADE TO THE ACCOUNT MAINTAINED BY THE EXCHANGE AGENT WITH THE BOOK-ENTRY
   TRANSFER FACILITY AND COMPLETE THE FOLLOWING:
 
  Name of Tendering Institution_______________________________________________
 
  Account Number____________              Transaction Code Number____________
 
[_]CHECK HERE IF TENDERED OLD NOTES ARE BEING DELIVERED PURSUANT TO A NOTICE
   OF GUARANTEED DELIVERY PREVIOUSLY SENT TO THE EXCHANGE AGENT AND COMPLETE
   THE FOLLOWING:
 
  Name(s) of Registered Holder(s)_____________________________________________
 
  Window Ticket Number (if any)_______________________________________________
 
  Date of Execution of Notice of Guaranteed Delivery__________________________
 
  Name of Institution which guaranteed delivery_______________________________
 
  IF DELIVERED BY BOOK-ENTRY TRANSFER, COMPLETE THE FOLLOWING:
 
  Account Number____________              Transaction Code Number____________
 
[_]CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10 ADDITIONAL
   COPIES OF THE PROSPECTUS AND 10 COPIES OF ANY AMENDMENTS OR SUPPLEMENTS
   THERETO.
 
  Name:_______________________________________________________________________
 
  Address:____________________________________________________________________
 
      ______________________________________________________________________
<PAGE>
 
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY
 
Ladies and Gentlemen:
 
  Upon the terms and subject to the conditions of the Exchange Offer, the
undersigned hereby tenders to the Company the aggregate principal amount at
maturity of Old Notes indicated above. Subject to, and effective upon, the
acceptance for exchange of the Old Notes tendered hereby, the undersigned
hereby sells, assigns and transfers to, or upon the order of, the Company all
right, title and interest in and to such Old Notes as are being tendered
hereby.
 
  The undersigned hereby represents and warrants that the undersigned has full
power and authority to tender, sell, assign and transfer the Old Notes
tendered hereby and that the Company will acquire good and unencumbered title
thereto, free and clear of all liens, restrictions, charges and encumbrances
and not subject to any adverse claim when the same are accepted by the
Company. The undersigned hereby further represents that any New Notes acquired
in exchange for Old Notes tendered hereby will have been acquired in the
ordinary course of business of the person receiving such New Notes, whether or
not such person is the undersigned, that neither the holder of such Old Notes
nor any such other person is engaged in, or intends to engage in a
distribution of such New Notes, or has an arrangement or understanding with
any person to participate in the distribution of such New Notes, and that
neither the holder of such Old Notes nor any such other person is an
"affiliate," as defined in Rule 405 under the Securities Act of 1933 (the
"Securities Act"), of the Company.
 
  The undersigned also acknowledges that this Exchange Offer is being made by
the Company based upon the Company's understanding of an interpretation by the
staff of the Securities and Exchange Commission (the "Commission") as set
forth in no-action letters issued to third parties, that the New Notes issued
in exchange for the Old Notes pursuant to the Exchange Offer may be offered
for resale, resold and otherwise transferred by holders thereof (other than
any such holder that is an "affiliate" of the Company within the meaning of
Rule 405 under the Securities Act), without compliance with the registration
and prospectus delivery provisions of the Securities Act, provided that: (1)
such holders are not affiliates of the Company within the meaning of Rule 405
under the Securities Act; (2) such New Notes are acquired in the ordinary
course of such holders' business; and (3) such holders are not engaged in, and
do not intend to engage in, a distribution of such New Notes and have no
arrangement or understanding with any person to participate in the
distribution of such New Notes. However, the staff of the Commission has not
considered the Exchange Offer in the context of a no-action letter, and there
can be no assurance that the staff of the Commission would make a similar
determination with respect to the Exchange Offer as in other circumstances. If
a holder of Old Notes is an affiliate of the Company, and is engaged in or
intends to engage in a distribution of the New Notes or has any arrangement or
understanding with respect to the distribution of the New Notes to be acquired
pursuant to the Exchange Offer, such holder could not rely on the applicable
interpretations of the staff of the Commission and must comply with the
registration and prospectus delivery requirements of the Securities Act in
connection with any secondary resale transaction. If the undersigned is a
broker-dealer that will receive New Notes for its own account in exchange for
Old Notes, it represents that the Old Notes to be exchanged for the New Notes
were acquired by it as a result of market-making activities or other trading
activities and acknowledges that it will deliver a prospectus in connection
with any resale of such New Notes; however, by so acknowledging and by
delivering a prospectus, the undersigned will not be deemed to admit that it
is an "underwriter" within the meaning of the Securities Act.
 
  The undersigned will, upon request, execute and deliver any additional
documents deemed by the Company to be necessary or desirable to complete the
sale, assignment and transfer of the Old Notes tendered hereby. All authority
conferred or agreed to be conferred in this Letter and every obligation of the
undersigned hereunder shall be binding upon the successors, assigns, heirs,
executors, administrators, trustees in bankruptcy and legal representatives of
the undersigned and shall not be affected by, and shall survive, the death or
incapacity of the undersigned. This tender may be withdrawn only in accordance
with the procedures set forth in "The Exchange Offer--Withdrawal of Tenders"
section of the Prospectus.
 
  Unless otherwise indicated herein in the box entitled "Special Issuance
Instructions" below, please deliver the New Notes in the name of the
undersigned or, in the case of a book-entry delivery of Old Notes, please
credit the
<PAGE>
 
account indicated above maintained at the Book-Entry Transfer Facility.
Similarly, unless otherwise indicated under the box entitled "Special Delivery
Instructions" below, please send the New Notes to the undersigned at the
address shown above in the box entitled "Description of Old Notes."
 
  THE UNDERSIGNED, BY COMPLETING THE BOX ENTITLED "DESCRIPTION OF OLD NOTES"
ABOVE AND SIGNING THIS LETTER, WILL BE DEEMED TO HAVE TENDERED THE OLD NOTES
AS SET FORTH IN SUCH BOX ABOVE.
 
 
         SPECIAL ISSUANCE                    SPECIAL DELIVERY INSTRUCTIONS
  INSTRUCTIONS(SEE INSTRUCTIONS 2             (SEE INSTRUCTIONS 2 AND 5)
              AND 3)
 
 
                                            To be completed ONLY if certif-
  To be completed ONLY if certif-          icates for Old Notes not ex-
 icates for Old Notes not ex-              changed and/or New Notes are to
 changed and/or New Notes are to           be sent to someone other than
 be issued in the name of and              the person(s) whose signature(s)
 sent to someone other than the            appear(s) on this Letter above
 person(s) whose signature(s) ap-          or to such person(s) at an ad-
 pear(s) on this Letter above, or          dress other than shown in the
 if Old Notes delivered by book-           box entitled "Description of Old
 entry transfer which are not ac-          Notes" on this Letter above.
 cepted for exchange are to be
 returned by credit to an account
 maintained at the Book-Entry
 Transfer Facility other than the
 account indicated above.
 
                                           Mail New Notes and/or Old Notes
                                           to:
                                           Name(s): ________________________
                                                (PLEASE TYPE OR PRINT)
 
                                           _________________________________
 Issue New Notes and/or Old Notes               (PLEASE TYPE OR PRINT)
 to:                                       Address: ________________________
 
                                           _________________________________
 Name(s): ________________________               (INCLUDING ZIP CODE)
      (PLEASE TYPE OR PRINT)
 _________________________________
      (PLEASE TYPE OR PRINT)
 Address: ________________________
 _________________________________
       (INCLUDING ZIP CODE)
 
      (COMPLETE ACCOMPANYING
       SUBSTITUTE FORM W-9)
 
 [_]Credit unexchanged Old Notes
    delivered by book-entry
    transfer to the Book-Entry
    Transfer Facility account set
    forth below.
 
 _________________________________
   (BOOK-ENTRY TRANSFER FACILITY
  ACCOUNT NUMBER, IF APPLICABLE)
 
 IMPORTANT: THIS LETTER OR A FACSIMILE HEREOF (TOGETHER WITH THE CERTIFICATES
            FOR OLD NOTES OR A BOOK-ENTRY CONFIRMATION AND ALL OTHER REQUIRED
            DOCUMENTS OR THE NOTICE OF GUARANTEED DELIVERY) MUST BE RECEIVED
            BY THE EXCHANGE AGENT PRIOR TO 5:00 P.M., NEW YORK CITY TIME, ON
            THE EXPIRATION DATE.
 
                 PLEASE READ THIS ENTIRE LETTER OF TRANSMITTAL
                  CAREFULLY BEFORE COMPLETING ANY BOX ABOVE.
 
<PAGE>
 
 
                                PLEASE SIGN HERE
                   (TO BE COMPLETED BY ALL TENDERING HOLDERS)
          (COMPLETE ACCOMPANYING SUBSTITUTE FORM W-9 ON REVERSE SIDE)
 Dated:________________________________________________________________, 1998
 x:____________________________________________________              , 1998
 x:____________________________________________________              , 1998
              (SIGNATURE(S) OF OWNER(S))                         (DATE)
 Area Code and Telephone Number:_____________________________________________
 
 If a holder is tendering any Old Notes, this Letter must be signed by the
 registered holder(s) as the name(s) appear(s) on the certificate(s) for the
 Old Notes or by any person(s) authorized to become registered holder(s) by
 endorsements and documents transmitted herewith. If signature is by a
 trustee, executor, administrator, guardian, officer or other person acting
 in a fiduciary or representative capacity, please set forth full title. See
 Instruction 2.
 
 
 Name(s):____________________________________________________________________
 ____________________________________________________________________________
                             (PLEASE TYPE OR PRINT)
 
 Capacity:___________________________________________________________________
 Address:____________________________________________________________________
 ____________________________________________________________________________
                              (INCLUDING ZIP CODE)
 
                              SIGNATURE GUARANTEE
                         (IF REQUIRED BY INSTRUCTION 2)
 
 Signature Guaranteed by
 an Eligible Institution:____________________________________________________
                             (AUTHORIZED SIGNATURE)
 ____________________________________________________________________________
                                    (TITLE)
 ____________________________________________________________________________
                                (NAME AND FIRM)
 
 Dated:________________________________________________________________, 1998
 
<PAGE>
 
                                 INSTRUCTIONS
 
 FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER TO EXCHANGE REGISTERED
    10 5/8% SENIOR DISCOUNT NOTES DUE 2007 FOR UP TO $251,000,000 PRINCIPAL
  AMOUNT AT MATURITY OF OUTSTANDING 10 5/8% SENIOR DISCOUNT NOTES DUE 2007 OF
                       CROWN CASTLE INTERNATIONAL CORP.
 
1. DELIVERY OF THIS LETTER AND OLD NOTES; GUARANTEED DELIVERY PROCEDURES.
 
  This Letter is to be completed by holders of Old Notes either if
certificates are to be forwarded herewith or if tenders are to be made
pursuant to the procedures for delivery by book-entry transfer set forth in
"The Exchange Offer-Book-Entry Transfer" section of the Prospectus.
Certificates for all physically tendered Old Notes, or Book-Entry
Confirmation, as the case may be, as well as a properly completed and duly
executed Letter of Transmittal (or facsimile thereof) and any other documents
required by this Letter, must be received by the Exchange Agent at the address
set forth herein on or prior to the Expiration Date, or the tendering holder
must comply with the guaranteed delivery procedures set forth below. Old Notes
tendered hereby must be in denominations of principal amount at maturity of
$1,000 and any integral multiple thereof.
 
  Holders of Old Notes whose certificates for Old Notes are not immediately
available or who cannot deliver their certificates and all other required
documents to the Exchange Agent on or prior to the Expiration Date, or who
cannot complete the procedure for book-entry transfer on a timely basis, may
tender their Old Notes pursuant to the guaranteed delivery procedures set
forth in "The Exchange Offer--Guaranteed Delivery Procedures" section of the
Prospectus. Pursuant to such procedures, (i) such tender must be made through
an Eligible Institution (as defined below), (ii) prior to the Expiration Date,
the Exchange Agent must receive from such Eligible Institution a properly
completed and duly executed Letter of Transmittal (or facsimile thereof) and
Notice of Guaranteed Delivery, substantially in the form provided by the
Company (by facsimile transmission, mail or hand delivery), setting forth the
name and address of the holder of Old Notes, the certificate number or numbers
of such Old Notes and the principal amount at maturity of Old Notes tendered,
stating that the tender is being made thereby and guaranteeing that within
five business days after the Expiration Date, the Letter of Transmittal (or
facsimile thereof), together with the certificate or certificates representing
the Old Notes to be tendered in proper form for transfer, or a Book-Entry
Confirmation, as the case may be, and any other documents required by this
Letter will be deposited by the Eligible Institution with the Exchange Agent,
and (iii) such properly completed and executed Letter of Transmittal (or
facsimile thereof), as well as the certificate or certificates representing
all tendered Old Notes in proper form for transfer, or a Book-Entry
Confirmation, as the case may be, and all other documents required by the
Letter of Transmittal are received by the Exchange Agent within five business
days after the Expiration Date.
 
  The method of delivery of this Letter, the Old Notes and all other required
documents is at the election and risk of the tendering holders. Instead of
delivery by mail, it is recommended that holders use an overnight or hand
delivery service. In all cases, sufficient time should be allowed to assure
delivery to the Exchange Agent before the Expiration Date. No Letter of
Transmittal or Old Notes should be sent to the Company. Holders may request
their respective brokers, dealers, commercial banks, trust companies or
nominees to effect the tenders for such holders.
 
  See "The Exchange Offer" section of the Prospectus.
 
2. SIGNATURES ON THIS LETTER, BOND POWERS AND ENDORSEMENTS; GUARANTEE OF
SIGNATURES.
 
  If this Letter is signed by the registered holder of the Old Notes tendered
hereby, the signature must correspond exactly with the name as written on the
face of the certificates without any change whatsoever.
 
  If any tendered Old Notes are owned of record by two or more joint owners,
all such owners must sign this Letter.
<PAGE>
 
  If any tendered Old Notes are registered in different names on several
certificates, it will be necessary to complete, sign and submit as many
separate copies of this Letter as there are different registrations of
certificates.
 
  When this Letter is signed by the registered holder of the Old Notes
specified herein and tendered hereby, no endorsements of certificates or
separate bond powers are required. If, however, the New Notes are to be issued
to a person other than the registered holder, then endorsements of any
certificates transmitted hereby or separate bond powers are required.
Signatures on such certificates must be guaranteed by an Eligible Institution.
 
  If the Letter of Transmittal is signed by a person other than the registered
holder of any Old Notes listed therein, such Old Notes must be endorsed by
such registered holder or accompanied by a properly completed bond power, in
each case signed or endorsed in blank by such registered holder as such
registered holder's name appears on such Old Notes.
 
  If the Letter of Transmittal or any Old Notes or bond powers are signed or
endorsed by trustees, executors, administrators, guardians, attorney-in-fact,
officers of corporations or others acting in a fiduciary or representative
capacity, such persons should so indicate when signing, and unless waived by
the Company, evidence satisfactory to the Company of their authority to so act
must be submitted with the Letter of Transmittal.
 
  Signature on a Letter of Transmittal or a notice of withdrawal, as the case
may be, must be guaranteed by an Eligible Institution unless the Old Notes
tendered pursuant thereto are tendered (i) by a registered holder who has not
completed the box entitled "Special Payment Instructions" or "Special Delivery
Instructions" on the Letter of Transmittal or (ii) for the account of an
Eligible Institution. In the event that signatures on a Letter of Transmittal
or a notice of withdrawal, as the case may be, are required to be guaranteed,
such guarantee must be by a member firm of a registered national securities
exchange or of the National Association of Securities Dealers, Inc., a
commercial bank or trust company having an office or correspondent in the
United States or an "eligible guarantor institution" within the meaning of
Rule 17Ad-15 under the Securities Exchange Act of 1934, as amended (an
"Eligible Institution").
 
3. SPECIAL ISSUANCE AND DELIVERY INSTRUCTIONS.
 
  Tendering holders of Old Notes should indicate in the applicable box the
name and address to which New Notes issued pursuant to the Exchange Offer are
to be issued or sent, if different from the name or address of the person
signing this Letter. In the case of issuance in a different name, the employer
identification or social security number of the person named must also be
indicated. A holder of Old Notes tendering Old Notes by book-entry transfer
may request that Old Notes not exchanged be credited to such account
maintained at the Book-Entry Transfer Facility as such holder of Old Notes may
designate hereon. If no such instructions are given, such Old Notes not
exchanged will be returned to the name or address of the person signing this
Letter.
 
4. TAX IDENTIFICATION NUMBER.
 
  Federal income tax law generally requires that a tendering holder whose Old
Notes are accepted for exchange must provide the Company (as payor) with such
holder's correct Taxpayer Identification Number ("TIN") on Substitute FormW-9
below or otherwise establish a basis for exemption from backup withholding. If
such holder is an individual, the TIN is his or her social security number. If
the Company is not provided with the current TIN or an adequate basis for an
exemption, such tendering holder may be subject to a $50 penalty imposed by
the Internal Revenue Service. In addition, delivery of New Notes to such
tendering holder may be subject to backup withholding in an amount equal to
31% of all reportable payments made after the exchange.
 
  Certain holders (including, among others, all corporations and certain
foreign individuals) are not subject to these backup withholding and reporting
requirements. See the enclosed Guidelines of Certification of Taxpayer
Identification Number on Substitute Form W-9 (the "W-9 Guidelines") for
additional instructions.
 
  To prevent backup withholding, each tendering holder of Old Notes must
provide its correct TIN by completing the "Substitute Form W-9" set forth
below, certifying that the TIN provided is correct (or that such
<PAGE>
 
holder is awaiting a TIN) and that (i) the holder is exempt from backup
withholding, (ii) the holder has not been notified by the Internal Revenue
Service that such holder is subject to a backup withholding as a result of a
failure to report all interest or dividends or (iii) the Internal Revenue
Service has notified the holder that such holder is no longer subject to
backup withholding. If the tendering holder of Old Notes is a nonresident
alien or foreign entity not subject to backup withholding, such holder must
give the Company a completed Form W-8, Certificate of Foreign Status. These
forms may be obtained from the Exchange Agent. If the Old Notes are in more
than one name or are not in the name of the actual owner, such holder should
consult the W-9 Guidelines for information on which TIN to report. If such
holder does not have a TIN, such holder should consult the W-9 Guidelines for
instructions on applying for a TIN, check the box in Part 2 of the Substitute
Form W-9 and write "applied for" in lieu of its TIN. Note: checking this box
and writing "applied for" on the form means that such holder has already
applied for a TIN or that such holder intends to apply for one in the near
future. If a holder checks the box in Part 2 of the Substitute Form W-9 and
writes "applied for" on that form, backup withholding at a 31% rate will
nevertheless apply to all reportable payments made to such holder. If such a
holder furnishes its TIN to the Company within 60 days, however, any amounts
so withheld shall be refunded to such holder.
 
  Backup withholding is not an additional Federal income tax. Rather, the
Federal income tax liability of persons subject to backup withholding will be
reduced by the amount of tax withheld. If withholding results in overpayment
of taxes, a refund may be obtained from the Internal Revenue Service.
 
5. TRANSFER TAXES.
 
  Holders who tender their Old Notes for exchange will not be obligated to pay
any transfer taxes in connection therewith. If, however, New Notes are to be
delivered to, or are to be issued in the name of, any person other than the
registered holder of the Old Notes tendered hereby, or if tendered Old Notes
are registered in the name of any person other than the person signing this
Letter, or if a transfer tax is imposed for any reason other than the exchange
of Old Notes in connection with to the Exchange Offer, the amount of any such
transfer taxes (whether imposed on the registered holder or any other persons)
will be payable by the tendering holder. If satisfactory evidence of payment
of such taxes or exemption therefrom is not submitted herewith, the amount of
such transfer taxes will be billed directly to such tendering holder.
 
  EXCEPT AS PROVIDED IN THIS INSTRUCTION 5, IT WILL NOT BE NECESSARY FOR
TRANSFER TAX STAMPS TO BE AFFIXED TO THE OLD NOTES SPECIFIED IN THIS LETTER.
 
6. WAIVER OF CONDITIONS.
 
  The Company reserves the right to waive satisfaction of any or all
conditions enumerated in the Prospectus.
 
7. NO CONDITIONAL TENDERS.
 
  No alternative, conditional, irregular or contingent tenders will be
accepted. All tendering holders of Old Notes, by execution of this Letter,
shall waive any right to receive notice of the acceptance of their Old Notes
for exchange.
 
  Neither the Company, the Exchange Agent nor any other person is obligated to
give notice of any defect or irregularity with respect to any tender of Old
Notes nor shall any of them incur any liability for failure to give any such
notice.
 
8. MUTILATED, LOST, STOLEN OR DESTROYED OLD NOTES.
 
  Any holder whose Old Notes have been mutilated, lost, stolen or destroyed
should contact the Exchange Agent at the address indicated above for further
instructions.
 
9. REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES.
 
 Questions relating to the procedure for tendering, as well as requests for
additional copies of the Prospectus and this Letter, may be directed to the
Exchange Agent, at the address and telephone number indicated above.
<PAGE>
 
                    TO BE COMPLETED BY ALL TENDERING HOLDERS
                              (SEE INSTRUCTION 4)
 
                 PAYOR'S NAME: CROWN CASTLE INTERNATIONAL CORP.
 
 
 
                        PART 1--PLEASE PROVIDE YOUR
 SUBSTITUTE             TIN IN THE BOX AT RIGHT AND    ----------------------
 FORM W-9               CERTIFY BY SIGNING AND             Social Security
                        DATING BELOW.                         Number(s)
 
 
 DEPARTMENT OF          CERTIFICATION--UNDER PENALTIES OF PERJURY, I CERTIFY
 THE TREASURY           THAT:
 INTERNAL                                                        OR
 REVENUE                (1) The number shown on this form is my correct
 SERVICE                    Taxpayer Identification Number (or I am waiting
                            for a number to be issued to me),
 
                                                       ----------------------
                        (2) I am not subject to backup withholding because:
                            (a) I am exempt from backup withholding, or (b) I
                            have not been notified by the Internal Revenue
                            Service (the "IRS") that I am subject to backup
                            withholding as a result of a failure to report
                            all interest or dividends, or (c) the IRS has
                            notified me that I am no longer subject to backup
                            withholding, and
                                                       Employer Identification
                        PART 2--TIN Applied For [_]           Number(s)
                       --------------------------------------------------------
 
 PAYER'S               --------------------------------------------------------
 REQUEST FOR
 TAXPAYER
 IDENTIFICATION
 NUMBER ("TIN")
 AND
 CERTIFICATION          (3) any other information provided on this form is
                            true and correct.
 
                        Signature: ___________________   Date: _______________
 
- --------------------------------------------------------------------------------
 You must cross out item (2) of the above certification if you have been
 notified by the IRS that you are subject to backup withholding because of
 underreporting of interest or dividends on your tax returns and you have not
 been notified by the IRS that you are no longer subject to backup
 withholding.
 
 
           YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED
                   THE BOX IN PART 2 OF SUBSTITUTE FORM W-9.
 
 
             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
 
 I certify under penalties of perjury that a taxpayer identification number
 has not been issued to me, and either (a) I have mailed or delivered an
 application to receive a taxpayer identification number to the appropriate
 Internal Revenue Service Center or Social Security Administration Office or
 (b) I intend to mail or deliver an application in the near future. I
 understand that if I do not provide a taxpayer identification number by the
 time of the exchange, 31 percent of all reportable payments made to me
 thereafter will be withheld until I provide a number.
 
 Signature _______________________________________ Date ______________________

<PAGE>

                                                                    EXHIBIT 99.2
 
                       NOTICE OF GUARANTEED DELIVERY FOR
                       CROWN CASTLE INTERNATIONAL CORP.
   
  This form or one substantially equivalent hereto must be used to accept the
Exchange Offer of Crown Castle International Corp. (the "Company") made
pursuant to the Prospectus, dated        (the "Prospectus"), and the enclosed
Letter of Transmittal (the "Letter of Transmittal") if certificates for Old
Notes of the Company are not immediately available or if the procedure for
book-entry transfer cannot be completed on a timely basis or time will not
permit all required documents to reach the Company prior to 5:00 P.M., New
York City time, on the Expiration Date of the Exchange Offer. Such form may be
delivered or transmitted by facsimile transmission, mail or hand delivery to
United States Trust Company of New York (the "Exchange Agent") as set forth
below. In addition, in order to utilize the guaranteed delivery procedure to
tender Old Notes pursuant to the Exchange Offer, a completed, signed and dated
Letter of Transmittal (or facsimile thereof) must also be received by the
Exchange Agent prior to 5:00 P.M., New York City time, on the Expiration Date.
Capitalized terms not defined herein are defined in the Prospectus.     
      
   DELIVERY TO: UNITED STATES TRUST COMPANY OF NEW YORK, EXCHANGE AGENT     
 
     By Mail:         By Overnight          By Hand:          By Facsimile:
                        Courier:
 
 
 
 
                                                           FAX NO. (212) 420-
   UNITED STATES                          UNITED STATES           6152
  TRUSTCOMPANY OF     UNITED STATES     TRUST COMPANY OF      (FOR ELIGIBLE
   NEW YORK         TRUST COMPANY OF      NEW YORK         INSTITUTIONS ONLY)
   P.O. BOX 844       NEW YORK            111 BROADWAY,
  COOPER STATION   770 BROADWAY, 13TH      LOWER LEVEL         CONFIRM BY
   NEW YORK, NY           FLOOR        NEW YORK, NY 10006      TELEPHONE:
    10276-0844     NEW YORK, NY 10003    ATTN: CORPORATE      TELEPHONE NO.
  (REGISTERED OR     ATTN: CORPORATE     TRUST SERVICES      (800) 548-6565
  CERTIFIED MAIL    TRUST OPERATIONS
   RECOMMENDED)        DEPARTMENT      
 
  DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE, OR
TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE OTHER THAN AS SET FORTH ABOVE, WILL
NOT CONSTITUTE A VALID DELIVERY.
   
Ladies and Gentlemen:     
 
  Upon the terms and conditions set forth in the Prospectus and the
accompanying Letter of Transmittal, the undersigned hereby tenders to the
Company the principal amount of Old Notes set forth below, pursuant to the
guaranteed delivery procedure described in "The Exchange Offer--Guaranteed
Delivery Procedures" section of the Prospectus.
                                             
Principal Amount at Maturity of Old      If Old Notes will be delivered by
Notes Tendered:                          book-entry transfer to The
                                         Depository Trust Company, provide
                                         account number. 
    
$_________________________     
   
Certificate Nos. (if available):     
- -------------------------------
   
Total Principal Amount at Maturity
Represented by Old Notes
Certificate(s):     
                                         
$_________________________               Account Number _________________     
<PAGE>
 
  All authority herein conferred or agreed to be conferred shall survive the
death or incapacity of the undersigned and every obligation of the undersigned
hereunder shall be binding upon the heirs, personal representatives,
successors and assigns of the undersigned.
 
 
 
NOTE: DO NOT SEND CERTIFICATES FOR OLD NOTES WITH THIS FORM. CERTIFICATES FOR
OLD NOTES SHOULD ONLY BE SENT WITH YOUR LETTER OF TRANSMITTAL.
                               PLEASE SIGN HERE
 X ___________________________   -----------------------------
 X ___________________________   -----------------------------
  Signature(s) of Owner(s)         Date
  or Authorized Signatory
 
 Area Code and Telephone Number: _____________________________
 
 Must be signed by the holder(s) of Old Notes as the name(s)
 of such holder(s) appear(s) on the Old Notes certificate(s)
 or on a security position listing, or by person(s)
 authorized to become registered holder(s) by endorsement and
 documents transmitted with this Notice of Guaranteed
 Delivery. If any signature is by a trustee, executor,
 administrator, guardian, attorney-in-fact, officer or other
 person acting in a fiduciary or representative capacity,
 such person must set forth his or her full title below.
 
                     PLEASE PRINT NAME(S) AND ADDRESS(ES)
 Name(s):  --------------------------------------------------------------------
           --------------------------------------------------------------------
           --------------------------------------------------------------------
 Capacity: --------------------------------------------------------------------
 Address(es):
           --------------------------------------------------------------------
           --------------------------------------------------------------------
           --------------------------------------------------------------------
 
                                   GUARANTEE
 
 The undersigned, a member of a registered national
 securities exchange, or a member of the National Association
 of Securities Dealers, Inc., or a commercial bank trust
 company having an office or correspondent in the United
 States, or an "eligible guarantor institution" within the
 meaning of Rule 17Ad-15 of the Securities Exchange Act of
 1934, as amended, hereby guarantees that the certificates
 representing the principal amount of Old Notes tendered
 hereby in proper form for transfer, or timely confirmation
 of the book-entry transfer of such Old Notes into the
 Exchange Agent's account at The Depository Trust Company
 pursuant to the procedures set forth in "The Exchange
 Offer--Guaranteed Delivery Procedures" section of the
 Prospectus, together with a properly completed and duly
 executed Letter of Transmittal (or facsimile thereof) with
 any required signature guarantee and any other documents
 required by the Letter of Transmittal, will be received by
 the Exchange Agent at the address set forth above, within
 five business days after the Expiration Date.
 -----------------------------   -----------------------------
          Name of Firm               Authorized Signature
 -----------------------------   -----------------------------
             Address                         Title
 -----------------------------   Name: _______________________
            Zip Code                   (Please Type or Print)
 Area Code and Tel. No.: _____   Dated: ______________________

<PAGE>

                                                                    EXHIBIT 99.3
 
                       CROWN CASTLE INTERNATIONAL CORP.
 
                             OFFER TO EXCHANGE ITS
                    10 5/8% SENIOR DISCOUNT NOTES DUE 2007,
         WHICH HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
              FOR UP TO $251,000,000 PRINCIPAL AMOUNT AT MATURITY
                              OF ITS OUTSTANDING
                    10 5/8% SENIOR DISCOUNT NOTES DUE 2007
 
To: Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees:
 
  Crown Castle International Corp. (the "Company") is offering to exchange
(the "Exchange Offer"), upon and subject to the terms and conditions set forth
in the Prospectus, dated           (the "Prospectus"), and the enclosed Letter
of Transmittal (the "Letter of Transmittal"), its registered 10 5/8% Senior
Discount Notes due 2007 (the "New Notes") for up to $251,000,000 aggregate
principal amount at maturity of its outstanding 10 5/8% Senior Discount Notes
due 2007 (the "Old Notes"). The Exchange Offer is being made in order to
satisfy certain obligations of the Company contained in the Registration
Rights Agreement dated as of November 25, 1997, between the Company and the
Initial Purchasers.
 
  We are requesting that you contact your clients for whom you hold Old Notes
regarding the Exchange Offer. For your information and for forwarding to your
clients for whom you hold Old Notes registered in your name or in the name of
your nominee, or who hold Old Notes registered in their own names, we are
enclosing the following documents:
 
    1. Prospectus dated          ;
 
    2. The Letter of Transmittal for your use and for the information of your
  clients;
 
    3. A Notice of Guaranteed Delivery to be used to accept the Exchange
  Offer if certificates for Old Notes are not immediately available or time
  will not permit all required documents to reach the Exchange Agent prior to
  the Expiration Date (as defined below) or if the procedure for book-entry
  transfer cannot be completed on a timely basis;
 
    4. A form of letter which may be sent to your clients for whose account
  you hold Old Notes registered in your name or the name of your nominee,
  with space provided for obtaining such clients' instructions with regard to
  the Exchange Offer;
 
    5. Guidelines for Certification of Taxpayer Identification Number on
  Substitute Form W-9; and
 
    6. Return envelopes addressed to United States Trust Company of New York,
  the Exchange Agent for the Old Notes.
 
  YOUR PROMPT ACTION IS REQUESTED. THE EXCHANGE OFFER WILL EXPIRE AT 5:00P.M.,
NEW YORK CITY TIME, ON             (THE "EXPIRATION DATE") (20 BUSINESS DAYS
FOLLOWING THE COMMENCEMENT OF THE EXCHANGE OFFER), UNLESS EXTENDED BY THE
COMPANY. THE OLD NOTES TENDERED PURSUANT TO THE EXCHANGE OFFER MAY BE
WITHDRAWN AT ANY TIME BEFORE 5:00P.M, NEW YORK CITY TIME, ON THE EXPIRATION
DATE.
 
  To participate in the Exchange Offer, a duly executed and properly completed
Letter of Transmittal (or facsimile thereof), with any required signature
guarantees and any other required documents, should be sent to the Exchange
Agent and certificates representing the Old Notes should be delivered to the
Exchange Agent, all in accordance with the instructions set forth in the
Letter of Transmittal and the Prospectus.
 
  If holders of Old Notes wish to tender, but it is impracticable for them to
forward their certificates for Old Notes prior to the expiration of the
Exchange Offer or to comply with the book-entry transfer procedures on a
timely basis, a tender may be effected by following the guaranteed delivery
procedures described in the Prospectus under "The Exchange Offer--Guaranteed
Delivery Procedures."
<PAGE>
 
  Any inquiries you may have with respect to the Exchange Offer, or requests
for additional copies of the enclosed materials should be directed to the
Exchange Agent for the Old Notes, at its address and telephone number set
forth on the front of the Letter of Transmittal.
 
                                          Very truly yours,
 
                                          Crown Castle International Corp.
 
 
   NOTHING HEREIN OR IN THE ENCLOSED DOCUMENTS SHALL CONSTITUTE YOU OR ANY
 OTHER PERSON AS AN AGENT OF THE COMPANY OR THE EXCHANGE AGENT, OR AUTHORIZE
 YOU OR ANY OTHER PERSON TO USE ANY DOCUMENT OR MAKE ANY STATEMENTS ON BEHALF
 OF EITHER OF THEM WITH RESPECT TO THE EXCHANGE OFFER, EXCEPT FOR STATEMENTS
 EXPRESSLY MADE IN THE PROSPECTUS OR THE LETTER TO TRANSMITTAL.
 
 
Enclosures

<PAGE>

                                                                    EXHIBIT 99.4
 
                       CROWN CASTLE INTERNATIONAL CORP.
 
                             OFFER TO EXCHANGE ITS
                    10 5/8% SENIOR DISCOUNT NOTES DUE 2007,
         WHICH HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
              FOR UP TO $251,000,000 PRINCIPAL AMOUNT AT MATURITY
                              OF ITS OUTSTANDING
                    10 5/8% SENIOR DISCOUNT NOTES DUE 2007
 
To Our Clients:
 
  Enclosed for your consideration is a Prospectus, dated        (the
"Prospectus"), and the enclosed Letter of Transmittal (the "Letter of
Transmittal"), relating to the offer (the "Exchange Offer") of Crown Castle
International Corp. (the "Company") to exchange its registered 10 5/8% Senior
Discount Notes due 2007 (the "New Notes") for up to $251,000,000 principal
amount at maturity of its outstanding 10 5/8% Senior Discount Notes due 2007
(the "Old Notes"), upon the terms and subject to the conditions described in
the Prospectus. The Exchange Offer is being made in order to satisfy certain
obligations of the Company contained in the Registration Rights Agreement
dated as of November 25, 1997, between the Company and the Initial Purchasers.
 
  This material is being forwarded to you as the beneficial owner of the Old
Notes carried to us in your account but not registered in your name. A TENDER
OF SUCH OLD NOTES MAY ONLY BE MADE BY US AS THE HOLDER OF RECORD AND PURSUANT
TO YOUR INSTRUCTIONS.
 
  Accordingly, we request instructions as to whether you wish us to tender on
your behalf the Old Notes held by us for your account, pursuant to the terms
and conditions set forth in the enclosed Prospectus and Letter of Transmittal.
 
  Your instructions should be forwarded to us as promptly as possible in order
to permit us to tender the Old Notes on your behalf in accordance with the
provisions of the Exchange Offer. The Exchange Offer will expire at 5:00 p.m.,
New York City time, on       , (the "Expiration Date") (20 business days
following the commencement of the Exchange Offer) unless extended by the
Company. Any Old Notes tendered pursuant to the Exchange Offer may be
withdrawn at any time before 5:00p.m., New York City time, on the Expiration
Date.
 
  Your attention is directed to the following:
 
    1. The Exchange Offer is for any and all Old Notes.
 
    2. The Exchange Offer is subject to certain conditions set forth in the
  Prospectus in the section captioned "The Exchange Offer--Conditions to the
  Exchange Offer."
 
    3. The Exchange Offer expires at 5:00p.m., New York City time, on the
  Expiration Date, unless extended by the Company.
 
  If you wish to have the tender your Old Notes, please so instruct us by
completing, executing and returning to us the instruction form on the back of
this letter. THE LETTER OF TRANSMITTAL IS FURNISHED TO YOU FOR INFORMATION
ONLY AND MAY NOT BE USED DIRECTLY BY YOU TO TENDER OLD NOTES.
<PAGE>
 
                         INSTRUCTIONS WITH RESPECT TO
                              THE EXCHANGE OFFER
 
  The undersigned acknowledge(s) receipt of your letter and the enclosed
material referred to therein relating to the Exchange Offer made by Crown
Castle International Corp. with respect to its Old Notes.
 
  This will instruct you to tender the Old Notes held by you for the account
of the undersigned, upon and subject to terms and conditions set forth in the
Prospectus and the related Letter of Transmittal.
 
  Please tender the Old Notes held by you for may account as indicated below:
 
                                              AGGREGATE PRINCIPAL AMOUNT AT
                                                  MATURITY OF OLD NOTES
 
10 5/8% Senior Discount Notes due         _____________________________________
2007.................................
 
[_]Please do not tender any Old
   Notes held by you for my account.
 
Dated: _______________________ , 1998     _____________________________________
 
                                          _____________________________________
                                                       SIGNATURE(S)
 
                                          _____________________________________
 
                                          _____________________________________
 
                                          _____________________________________
                                                PLEASE PRINT NAME(S) HERE
 
                                          _____________________________________
 
                                          _____________________________________
                                                       ADDRESS(ES)
 
                                          _____________________________________
                                           AREA CODE(S) AND TELEPHONE NUMBER(S)
 
                                          _____________________________________
                                              TAX IDENTIFICATION OR SOCIAL
                                                     SECURITY NO(S).
 
  None of the Old Notes held by us for your account will be tendered unless we
receive written instructions from you to do so. Unless a specific contrary
instruction is given in the space provided, your signature(s) hereon shall
constitute an instruction to us to tender all the Old Notes held by us for
your account.

<PAGE>

                                                                    EXHIBIT 99.5
 
            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9
 
GUIDELINES FOR DETERMINING THE PROPER IDENTIFICATION NUMBER TO GIVE THE
PAYER.-- Social Security numbers have nine digits separated by two hyphens:
i.e. 000-00-0000. Employer identification numbers have nine digits separated
by only one hyphen: i.e. 00-0000000. The table below will help determine the
number to give the payer.
 
- -----------------------------------        -----------------------------------
 
 
<TABLE>
<CAPTION>
                            GIVE THE
                            SOCIAL SECURITY
FOR THIS TYPE OF ACCOUNT:   NUMBER OF--
- --------------------------------------------
<S>                         <C>
1. An individual's account  The individual
2. Two or more individuals  The actual owner
   (joint account)          of the account
                            or, if combined
                            funds, the first
                            individual on
                            the account(1)
3. Husband and wife (joint  The actual owner
   account)                 of the account
                            or, if joint
                            funds, either
                            person(1)
4. Custodian account of a   The minor(2)
   minor (Uniform Gift to
   Minors Act)
5. Adult and minor (joint   The adult or, if
   account)                 the minor is the
                            only
                            contributor, the
                            minor(1)
6. Account in the name of   The ward, minor,
   guardian or committee    or incompetent
   for a designated ward,   person(3)
   minor, or incompetent
   person
7.a. The usual revocable    The grantor-
     savings trust account  trustee(1)
     (grantor is also
     trustee)
b. So-called trust account  The actual
   that is not a legal or   owner(1)
   valid trust under State
   law
8. Sole proprietorship      The owner(4)
   account
- --------------------------------------------
</TABLE>
<TABLE>   
<CAPTION>
                             GIVE THE EMPLOYER
                             IDENTIFICATION
FOR THIS TYPE OF ACCOUNT:    NUMBER OF--
                                           ---
<S>                          <C>
 9. A valid trust, estate,   The legal entity
    or pension trust         (do not furnish
                             the identifying
                             number of the
                             personal
                             representative
                             or trustee
                             unless the legal
                             entity itself is
                             not designated
                             in the account
                             title.)(5)
10. Corporate account        The corporation
11. Religious, charitable,   The organization
    or educational
    organization account
12. Partnership account      The partnership
    held in the name of the
    business
13. Association, club, or    The organization
    other tax-exempt
    organization
14. A broker or registered   The broker or
    nominee                  nominee
15. Account with the         The public
    Department of            entity
    Agriculture in the name
    of a public entity
    (such as a State or
    local government,
    school district, or
    prison) that receives
    agricultural program
    payments
                                           ---
</TABLE>    
 
(1) List all names first and circle the name of the person whose number you
    furnish. If only one person on a joint account has a Social Security
    number, that person's number must be furnished.
(2) Circle the minor's name and furnish the minor's social security number.
(3) Circle the ward's, minor's or incompetent person's name and furnish such
    person's social security number.
(4) You must show your individual name, but you may also enter your business
    or "doing business as" name. You may use either your Social Security
    number or employer identification number (if you have one).
(5) List first and circle the name of the legal trust, estate, or pension
    trust.
 
NOTE: If no name is circled when there is more than one name, the number will
      be considered to be that of the first name listed.
<PAGE>
 
            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9
                                    PAGE 2
OBTAINING A NUMBER
If you don't have a taxpayer identification number or you don't know your
number, obtain Form SS-5, Application for a Social Security Number Card, or
Form SS-4, Application for Employer Identification Number (for business and
all other entities), at the local office of the Social Security Administration
or the Internal Revenue Service and apply for a number.
 
PAYEES EXEMPT FROM BACKUP WITHHOLDING
Payees specifically exempted from backup withholding on ALL payments include
the following:
 . A corporation.
 . A financial institution.
 . An organization exempt from tax under section 501(a), of the Internal
   Revenue Code of 1986, as amended (the "Code"), or an individual retirement
   plan, or a custodial account under Section 403(b)(7), if the account
   satisfies the requirements of Section 401(f)(7).
 . The United States or any agency or instrumentalities.
 . A State, the District of Columbia, a possession of the United States, or
   any political subdivision or instrumentality thereof.
 . A foreign government, a political subdivision of a foreign government, or
   any agency or instrumentality thereof.
 . An international organization or any agency, or instrumentality thereof.
 . A registered dealer in securities or commodities registered in the U.S.,
   the District of Columbia or a possession of the U.S.
 . A real estate investment trust.
 . A common trust fund operated by a bank under section 584(a) of the Code.
 . An exempt charitable remainder trust, or a non-exempt trust described in
   Section 4947(a)(1) of the Code.
 . An entity registered at all times under the Investment Company Act of
   1940.
 . A foreign central bank of issue.
 . A middleman known in the investment community as a nominee or who is
   listed in the most recent publication of the American Society of Corporate
   Secretaries, Inc., Nominee List.
Payments of dividends and patronage dividends not generally subject to backup
withholding include the following:
 . Payments to nonresident aliens subject to withholding under Section 1441
   of the Code.
 . Payments to partnerships not engaged in a trade or business in the U.S.
   and which have at least one nonresident partner.
 . Payments of patronage dividends where the amount received is not paid in
   money.
 . Payments made by certain foreign organizations.
 . Payments made to a nominee.
 . Section 404(k) payments made by an ESOP.
Payments of interest not generally subject to backup withholding include the
following:
 . Payments of interest on obligations issued by individuals. NOTE: You may
   be subject to backup withholding if this interest is $600 or more and is
   paid in the course of the payer's trade or business and you have not
   provided your correct taxpayer identification number to the payer.
 . Payments of tax-exempt interest (including exempt-interest dividends under
   Section 852 of the Code).
 . Payments described in Section 6049(b)(5) of the Code to nonresident
   aliens.
 . Payments on tax-free covenant bonds under section 1451 of the Code.
 . Payments made by certain foreign organizations.
 . Payments made to a nominee.
 . Mortgage interest paid to you.
Exempt payees described above should file Form W-9 to avoid possible erroneous
backup withholding. FILE THIS FORM WITH THE PAYER, FURNISH YOUR TAXPAYER
IDENTIFICATION NUMBER, WRITE "EXEMPT" ON THE FACE OF THE FORM, SIGN AND DATE
THE FORM AND RETURN IT TO THE PAYER. IF YOU ARE A NONRESIDENT ALIEN OR A
FOREIGN ENTITY NOT SUBJECT TO BACKUP WITHHOLDING, FILE WITH A PAYER A
COMPLETED INTERNAL REVENUE FORM W-8 (CERTIFICATE OF FOREIGN STATUS).
 Certain payments other than interest, dividends, and patronage dividends that
are not subject to information reporting are also not subject to backup
withholding. For details, see the regulations under Sections 6041, 6041A(a),
6045, and 6050(A) of the Code and the regulations promulgated thereunder.
PRIVACY ACT NOTICE.--Section 6109 requires most recipients of dividends,
interest, or other payments to give taxpayer identification numbers to payers
who must report the payments to the IRS. The IRS uses the numbers for
identification purposes. Payers must be given the numbers whether or not
recipients are required to file tax returns. Payers must generally withhold
31% of taxable interest, dividends, and certain other payments to a payee who
does not furnish a taxpayer identification number to a payer. Certain
penalties may also apply.
 
PENALTIES
(1) PENALTY FOR FAILURE TO FURNISH TAXPAYER IDENTIFICATION NUMBER.--If you
fail to furnish your taxpayer identification number to a payer, you are
subject to a penalty of $50 for each such failure unless your failure is due
to reasonable cause and not to willful neglect.
(2) CIVIL PENALTY FOR FALSE INFORMATION WITH RESPECT TO WITHHOLDING.--If you
make a false statement with no reasonable basis that results in no imposition
of backup withholding, you are subject to a penalty of $500.
(3) CRIMINAL PENALTY FOR FALSIFYING INFORMATION.--Wilfully falsifying
certifications or affirmations may subject you to criminal penalties including
fines and/or imprisonment.
FOR ADDITIONAL INFORMATION CONTACT YOUR TAX CONSULTANT OR THE INTERNAL REVENUE
SERVICE.


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