AMERICAN TOWER CORP /MA/
8-K, 1999-01-08
COMMUNICATIONS SERVICES, NEC
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM 8-K


                                 CURRENT REPORT

                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                Date of Report (Date of earliest event reported):
                      January 8, 1999 (December 18, 1998)

                           AMERICAN TOWER CORPORATION
             (Exact name of registrant as specified in its charter)

       Delaware                        001-14195              65-0723837
(State or Other Jurisdiction         (Commission            (IRS Employer
     of Incorporation)               File Number)          Identification No.)




         116 Huntington Avenue
         Boston, Massachusetts                                    02116
 (Address of Principal Executive Offices)                      (Zip Code)




                                 (617) 375-7500
              (Registrant's telephone number, including area code)


<PAGE>
Item 2.  Acquisition or Disposition of Assets.

      On December 18, 1998,  American Tower Corporation (the "Company" or "ATC")
entered into an Amended and Restated  Agreement and Plan of Merger (the "TeleCom
Merger  Agreement") with TeleCom Towers,  L.C.C.,  a Delaware limited  liability
company ("TeleCom"), American Towers, Inc., a wholly owned subsidiary of ATC and
a Delaware  corporation  ("ATI"),  and ATC Merger  Corporation,  a wholly  owned
subsidiary of ATI and a Delaware  corporation  ("ATMC"),  pursuant to which ATMC
will  merge  with and into  TeleCom,  which will be the  surviving  entity  (the
"TeleCom  Merger").  The  TeleCom  Merger  Agreement  amended and  restated  the
Agreement  and Plan of Merger (the  "Original  Merger  Agreement"),  dated as of
November  16,  1998,  by and among  ATC,  TeleCom  and ATI,  to (i)  reduce  the
aggregate  consideration  of $155.0  million to $148.75  million,  (ii) provide,
among other things,  for the  distribution  to the TeleCom members of all issued
and outstanding  limited liability company equity interests in a new subsidiary,
TeleCom  Towers-Pacific,  L.L.C.  ("TTP"),  into which TeleCom  contributed  its
partnership  interest in Prime-Telecom  Communications Co., a California general
partnership  ("Prime"),  and  (iii)  provide  for the  merger  of ATMC,  a newly
organized  subsidiary  of ATI, with and into TeleCom which will be the surviving
entity.  Simultaneously with the execution of the TeleCom Merger Agreement,  ATC
and TTP entered into put-call  arrangements  pursuant to which ATI would acquire
TTP for $12.5 million in the event TTP were to acquire the other 50% interest in
Prime.

      For more information,  see the TeleCom Merger Agreement, which is attached
herewith as Exhibit 2.1, and the Original Merger  Agreement,  which was filed as
Exhibit 2.2 to ATC's Form 10-Q for the quarter ended September 30, 1998.

      On December 23, 1998, ATC entered into an Amendment (the  "Amendment")  to
the TeleCom  Merger  Agreement  with  TeleCom,  ATI, and ATMC,  providing  for a
reduction  in the  aggregate  number  of  shares  of ATC  Class A  Common  Stock
deliverable  as part of the ATC Stock  Consideration  to the extent that TeleCom
fails to  achieve  certain  growth in its  Monthly  Tower  Revenue  Run Rate (as
defined  in the  TeleCom  Merger  Agreement).  For  more  information,  see  the
Amendment, which is attached herewith as Exhibit 2.2.

Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits.

         (c)  Exhibits

         Exhibit  2.1   -      Amended and Restated  Agreement and Plan of
                               Merger,  dated as of December  18,  1998,  by and
                               among American  Tower  Corporation  ("ATC"),  ATC
                               Merger   Corporation,   a  Delaware   corporation
                               ("ATMC"),   American  Towers,  Inc.,  a  Delaware
                               corporation ("ATI"), and TeleCom Towers,  L.L.C.,
                               a Delaware limited liability company ("TeleCom")
                               (Schedules and Exhibits omitted).

         Exhibit  2.2   -      Amendment, dated as of December 23, 1998, by and
                               among ATC, ATMC, ATI and TeleCom.




<PAGE>





                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                   AMERICAN TOWER CORPORATION
                                   (Registrant)


Date: January 8, 1999               By: /s/ Justin D. Benincasa 
                                        Name: Justin D. Benincasa
                                        Title: Vice President and 
                                               Corporate Controller





                                                                     EXHIBIT 2.1

                AMENDED AND RESTATED AGREEMENT AND PLAN OF MERGER

                                  By and Among

                           AMERICAN TOWER CORPORATION,

                             AMERICAN TOWERS, INC.,

                             ATC MERGER CORPORATION

                                       and

                             TELECOM TOWERS, L.L.C.

                                   Dated as of

                                December 18, 1998








<PAGE>
<TABLE>
<CAPTION>

                                TABLE OF CONTENTS
<S>                                                                                                              <C>
ARTICLE 1  DEFINED TERMS..........................................................................................1

ARTICLE 2  THE MERGER.............................................................................................2
                  2.1      The Merger.............................................................................2
                  2.2      Closing................................................................................2
                  2.3      Effective Time.........................................................................2
                  2.4      Effect of the Merger...................................................................2
                  2.5      TCT Operating Agreement................................................................2

ARTICLE 3  CONVERSION OF INTERESTS................................................................................3
                  3.1      Conversion of TCT Units  ..............................................................3
                  3.2      Delivery of Merger Consideration.......................................................4
                  3.3      Option Securities and Convertible Securities; No Payment Rights........................4
                  3.4      Determination of Merger Consideration.  ...............................................4

ARTICLE 4  REPRESENTATIONS AND WARRANTIES OF TCT .................................................................5
                  4.1      Organization and Business; Power and Authority; Effect of Transaction..................5
                  4.2      Financial and Other Information. ......................................................7
                  4.3      Material Statements and Omissions; Absence of Events...................................7
                  4.4      Title to Properties; Leases............................................................7
                  4.5      Compliance with Private Authorizations.................................................8
                  4.6      Compliance with Governmental Authorizations and Applicable Law.........................9
                  4.7      Intangible Assets.....................................................................10
                  4.8      Related Transactions..................................................................10
                  4.9      Insurance.............................................................................10
                  4.10     Tax Matters.  ........................................................................10
                  4.11     Employee Retirement Income Security Act of 1974.......................................11
                  4.12     Solvency..............................................................................13
                  4.13     Bank Accounts, Etc....................................................................13
                  4.14     Employment and Consulting Arrangements................................................13
                  4.15     Material Agreements...................................................................13
                  4.16     Ordinary Course of Business...........................................................14
                  4.17     Material and Adverse Restrictions.....................................................15
                  4.18     Broker or Finder......................................................................15
                  4.19     Environmental Matters.................................................................15
                  4.20     Capital Stock.........................................................................16
                  4.21     Year 2000 Compliant...................................................................16
                  4.22     Materiality...........................................................................16

ARTICLE 5  REPRESENTATIONS AND WARRANTIES OF ATC AND ATMC........................................................17
                  5.1      Organization and Business; Power and Authority; Effect of Transaction.................17
                  5.2      ATC SEC Reports.......................................................................18
                  5.3      Material Statements and Omissions; Absence of Events..................................18
                  5.4      Broker or Finder......................................................................19
                  5.5      Capital Stock.........................................................................19
                  5.6      Compliance with Governmental Authorizations and Applicable Law.  .....................19
                  5.7      Materiality...........................................................................20

ARTICLE 6  COVENANTS.............................................................................................20
                  6.1      Access to Information; Confidentiality.  .............................................20


<PAGE>
                  6.2      Agreement to Cooperate; Certain Other Covenants.  ....................................21
                  6.3      Public Announcements..................................................................22
                  6.4      Notification of Certain Matters.......................................................22
                  6.5      No Solicitation.......................................................................22
                  6.6      Conduct of Business by TCT Pending the Merger.........................................23
                  6.7      Preliminary Title Reports.............................................................25
                  6.8      Environmental Site Assessments........................................................25
                  6.9      Solicitation of Employees.............................................................25
                  6.10     Certificate of Non-Foreign Status.....................................................25
                  6.11     Tax Returns and Other Reports.........................................................26
                  6.12     Section 754 Elections.................................................................26

ARTICLE 7  CLOSING CONDITIONS....................................................................................26
                  7.1      Conditions to Obligations of Each Party...............................................26
                  7.2      Conditions to Obligations of ATC and ATMC.............................................26
                  7.3      Conditions to Obligations of TCT......................................................29

ARTICLE 8  TERMINATION, AMENDMENT AND WAIVER.....................................................................31
                  8.1      Termination...........................................................................31
                  8.2      Effect of Termination.................................................................31

ARTICLE 9  INDEMNIFICATION.......................................................................................32
                  9.1      Survival..............................................................................32
                  9.2      Indemnification.......................................................................32
                  9.3      Limitation of Liability...............................................................33
                  9.4      Notice of Claims......................................................................33
                  9.5      Defense of Third Party Claims.........................................................33
                  9.6      Exclusive Remedy......................................................................34
                  9.7      Indemnification of Directors and Officers.............................................34

ARTICLE 10  GENERAL PROVISIONS...................................................................................35
                  10.1     Waivers; Amendments...................................................................35
                  10.2     Fees, Expenses and Other Payments.....................................................36
                  10.3     Notices...............................................................................36
                  10.4     Specific Performance; Other Rights and Remedies.......................................37
                  10.5     Severability..........................................................................37
                  10.6     Counterparts..........................................................................38
                  10.7     Section Headings......................................................................38
                  10.8     Governing Law; Venue..................................................................38
                  10.9     Further Acts..........................................................................38
                  10.10    Entire Agreement......................................................................38
                  10.11    Assignment............................................................................39
                  10.12    Parties in Interest...................................................................39
                  10.13    Mutual Drafting.......................................................................39
                  10.14    TCT Disclosure Schedule...............................................................39
                  10.15    ATC's Due Diligence...................................................................40
                  10.16    Original Merger Agreement.............................................................40

</TABLE>


                                                           -ii-

<PAGE>



APPENDIX  A:                        Definitions

EXHIBITS:

         EXHIBIT A:        New TCT Operating Agreement (Section 2.5)
         EXHIBIT B:        Opinion of TCT Counsel (Section 7.2(b)).
         EXHIBIT C:        Registration Rights Agreement (Section 7.2(m)).
         EXHIBIT D:        TCT Investment Letter (Section 7.2(n)).
         EXHIBIT E:        ATC Noncompetition Agreements (Section 7.2(p)).
         EXHIBIT F:        Indemnity Escrow Agreement (Section 7.2(s)).
         EXHIBIT G:        Opinion of Sullivan & Worcester LLP (Section 7.3(b)).
         EXHIBIT H:        ATC Voting Agreement (Section 7.3(h)).
         EXHIBIT I:        Cox Special Release (Section 7.2(t)).

                                      -iii-

<PAGE>
                AMENDED AND RESTATED AGREEMENT AND PLAN OF MERGER


         Amended and Restated Agreement and Plan of Merger, dated as of December
18,  1998,  by and among  American  Tower  Corporation,  a Delaware  corporation
("ATC"),  American  Towers,  Inc., a Delaware  corporation  ("ATI"),  ATC Merger
Corporation,  a Delaware  corporation  ("ATMC"),  and TeleCom Towers,  L.L.C., a
Delaware limited liability company ("TCT").

                              W I T N E S S E T H:

         WHEREAS,  ATC,  ATI and TCT are  parties  to an  Agreement  and Plan of
Merger,  dated as of  November  16,  1998  (the  "Original  Merger  Agreement"),
providing  for the  merger of TCT with and into ATI on the terms and  conditions
set forth therein; and

         WHEREAS,  ATC,  ATI,  ATMC and TCT  desire  to amend  and  restate  the
Original  Merger  Agreement  in its  entirety  to make  certain  changes  to the
Original Merger Agreement; and

         WHEREAS,  ATC,  ATI,  ATMC and TCT have  entered  into this Amended and
Restated  Agreement and Plan of Merger (this  "Agreement")  providing  that ATMC
shall be merged with and into TCT, which shall be the surviving  entity,  on the
terms and conditions set forth in this Agreement (the "Merger").

         WHEREAS,  the  Boards  of  Directors  of  ATC,  ATI  and  ATMC  and the
Management  Committee  of TCT have  determined  that the Merger on the terms and
conditions set forth in this Agreement and Plan of Merger (this  "Agreement") is
consistent with and in furtherance of the long-term  business  strategy of each,
and is fair to, and in the best  interests of, the  stockholder  of ATMC and the
members of TCT (the "TCT Members"); and

         WHEREAS,  the Boards of Directors of ATMC and the Management  Committee
of TCT have  approved and adopted this  Agreement  and have  directed  that this
Agreement  be  submitted  to the  stockholder  of ATMC and the  members  of TCT,
respectively, for their adoption and approval; and

         WHEREAS,  the Board of  Directors  of ATI has approved and adopted this
Agreement and approved the Merger on behalf of ATMC as the sole  stockholder  of
ATMC; and

         WHEREAS,  as a condition  of the  willingness  of ATC and ATMC to enter
into  this  Agreement,  and as an  inducement  thereto,  TCT  Members  with  the
interests in TCT required  for TCT's  approval of the Merger and this  Agreement
are delivering their written consents approving and adopting the Merger and this
Agreement;

         NOW,   THEREFORE,   in   consideration   of  the   premises   and   the
representations, warranties, covenants and agreements herein contained and other
valuable   consideration,   the   receipt  and   adequacy   whereof  are  hereby
acknowledged,  the  parties  hereto  hereby,  intending  to  be  legally  bound,
represent, warrant, covenant and agree as follows:

<PAGE>
                                    ARTICLE 1

                                  DEFINED TERMS

         As used  herein,  unless  the  context  otherwise  requires,  the terms
defined in Appendix A shall have the respective meanings set forth therein.  The
term "TCT" as used in Appendix A shall include all  Subsidiaries  of TCT, except
as the context otherwise  clearly requires.  Terms defined in the singular shall
have a  comparable  meaning  when used in the plural,  and vice  versa,  and the
reference to any gender shall be deemed to include all genders. Unless otherwise
defined or the context otherwise clearly requires,  terms for which meanings are
provided  in this  Agreement  shall  have  such  meanings  when  used in the TCT
Disclosure  Schedule,  and each Collateral  Document  executed or required to be
executed pursuant hereto or thereto or otherwise  delivered,  from time to time,
pursuant  hereto or thereto.  References to "hereof,"  "herein" or similar terms
are intended to refer to the Agreement as a whole and not a particular  section,
and  references to "this Section" or "this Article" are intended to refer to the
entire  section or article and not a  particular  subsection  thereof.  The term
"either party" shall, unless the context otherwise  requires,  refer to ATC, ATI
and ATMC, on the one hand, and TCT, on the other hand.


                                    ARTICLE 2

                                   THE MERGER

         2.1 The Merger.  Upon the terms and subject to the conditions set forth
in this Agreement,  and in accordance with the Delaware General  Corporation Law
(the "DCL"),  and the Delaware Limited Liability  Company Act (the "DLLCA"),  at
the Effective  Time,  ATMC shall be merged with and into TCT. As a result of the
Merger,  the  separate  corporate  existence  of ATMC shall  cease and TCT shall
continue as the surviving Entity in the Merger (sometimes  referred to, as such,
as the "Surviving Entity").

         2.2 Closing.  Unless this Agreement shall have been terminated pursuant
to Section 9.1 and subject to the  satisfaction  or, to the extent  permitted by
Applicable  Law, waiver of the conditions set forth in Article 8, the closing of
the Merger (the  "Closing") will take place, at 10:00 a.m., on the Closing Date,
at the offices of  Sullivan & Worcester  LLP,  One Post Office  Square,  Boston,
Massachusetts  02109,  on the later of (a) January 4, 1999 and (b) a date set by
mutual  agreement  within ten (10) business days after the  satisfaction  of the
conditions  set forth in  Sections  7.1(b),  7.1(c) and 7.2(d)  (unless any such
condition is waived by the party  entitled to make such waiver)  shall have been
satisfied or waived,  unless another date, time or place is agreed to in writing
by the parties.  The date on which the Closing  occurs is herein  referred to as
the "Closing Date."

         2.3 Effective  Time.  Subject to the provisions of this  Agreement,  as
promptly as  practicable  after the Closing,  the parties hereto shall cause the
Merger to be  consummated  by filing a  Certificate  of Merger  and any  related
filings  required  under the DCL or the DLLCA with the Secretary of State of the
State of  Delaware.  The  Merger  shall  become  effective  at such time as such
documents are duly filed as aforesaid,  or at such later time as is specified in
such documents (the "Effective Time").

         2.4 Effect of the Merger.  The Merger  shall have the effects  provided
for under the DCL and the DLLCA.

         2.5  TCT  Operating  Agreement.  The  Amended  and  Restated  Operating
Agreement of TCT, as in effect immediately prior to the Effective Time, shall be
amended and restated to read in its entirety as set

                                       -2-
<PAGE>

forth in  Exhibit  A  attached  hereto  and  made a part  hereof  (the  "New TCT
Operating  Agreement"),  and as such  shall be the  operating  agreement  of the
Surviving Entity until  thereafter  changed or amended as provided therein or by
Applicable Law.


                                    ARTICLE 3

                             CONVERSION OF INTERESTS

         3.1  Conversion  of TCT Units At the  Effective  Time, by virtue of the
Merger  and  without  any  action  on the  part  of ATC,  ATMC  or TCT or  their
respective stockholders or members, as the case may be:

                  (a) Each share of Common Stock,  par value $.01 per share,  of
         ATMC issued and  outstanding  immediately  prior to the Effective  Time
         shall be  converted  into one TCT  Interest  (as defined in the New TCT
         Operating Agreement); and

                  (b)  Each  Class A Unit of TCT  and  each  Class B Unit of TCT
         (collectively,  the "TCT  Units")  issued and  outstanding  immediately
         prior to the Effective Time shall,  by virtue of the Merger and without
         any action on the part of the holder  thereof,  be  converted  into the
         right to receive its pro-rata share of the Merger Consideration.

The term "Merger  Price" shall mean an amount equal to the amount  determined by
(i)  subtracting  from  $148.75  million,  the  amount,  if any,  by  which  the
Indebtedness  for Money  Borrowed of TCT and its  Subsidiaries  at the Effective
Time (computed on a consolidated basis in accordance with GAAP) exceeds (ii) the
sum of (x) $30.0 million and (y) the  aggregate  amount  (including  acquisition
costs) TCT has paid  subsequent  to the  execution  and delivery of the Original
Agreement and prior to the Effective Time for any and all acquisitions including
ComSites USA and the remaining general partnership interests in Mid Pacific (for
an amount  not in excess of $5.5  million)  or capital  expenditures,  and (iii)
adding the amount by which the Current  Balance as of the Effective Time exceeds
zero or subtracting  the amount by which the Current Balance as of the Effective
Time is less than zero. The term "Merger  Consideration" shall mean and shall be
paid in (i) shares (the "ATC Stock  Consideration") of Class A Common Stock, par
value  $.01 per share,  of ATC (the "ATC  Common  Stock") in an amount  equal to
sixty percent (60%) of the Merger Price  (before  adjustment  pursuant to clause
(iii) of the  immediately  preceding  sentence) and (ii) cash for the balance of
the Merger Price (the "Cash Consideration"). (For example, assuming Indebtedness
for Borrowed  Money equal to $30.0 million and no capital  expenditures,  if the
Current Balance equals $10.0 million, the Merger Consideration shall be equal to
$158.75 million, payable $89.25 million in ATC Common Stock and $69.5 million in
Cash  Consideration.  With the same  assumptions,  if the Current Balance equals
($10.0  million),  the Merger  Consideration  shall be equal to $138.75 million,
payable   $89.25  million  in  ATC  Common  Stock  and  $49.5  million  in  Cash
Consideration.)  The Cash Consideration and the ATC Stock Consideration shall be
paid or issued,  as applicable,  to each TCT Member in the same  proportion that
the number of TCT Units held by such TCT Member bears to the aggregate number of
TCT Units held by all TCT  Members,  in all cases  without  distinction  between
classes of TCT Units.  For purposes of  determining  the number of shares of ATC
Common Stock issuable as the ATC Stock  Consideration,  the amount of the Merger
Price  payable in ATC Common Stock will be divided by the Current  Market Price,
subject to adjustment as provided in the following paragraph.

           In the event the  Closing  Date Share  Price is less than $17.75 (the
Current  Market Price ($21.25) minus $3.50 per share) (the "Floor Share Price"),
the ATC  Stock  Consideration  shall be  increased  by a number of shares of ATC
Common Stock determined as follows:

                                       -3-

<PAGE>
                  (i)  Divide  the ATC Stock  Consideration  by the Floor  Share
         Price;

                  (ii) Divide the ATC Stock  Consideration  by the Closing  Date
         Share Price; and

                  (iii) Subtract the amount  determined under paragraph (i) from
         the amount determined under paragraph (ii).

In the event the Closing Date Share Price  exceeds  $24.75 (the  Current  Market
Price  ($21.25) plus $3.50 per share) (the "Ceiling  Share Price") the ATC Stock
Consideration  shall be  decreased  by a number of shares  of ATC  Common  Stock
determined as follows:

                  (i) Divide the ATC Stock  Consideration  by the Ceiling  Share
         Price;

                  (ii) Divide the ATC Stock  Consideration  by the Closing  Date
         Share Price; and

                  (iii) Subtract the amount determined under paragraph (ii) from
         the amount determined under paragraph (i).

          At the Effective  Time,  all TCT Units shall no longer be  outstanding
and shall  automatically  be canceled and retired and shall cease to exist,  and
each  holder  of TCT  Units  shall  have,  instead,  the  right to  receive,  in
accordance  with the provisions of Section 3.2, its pro rata share of the Merger
Consideration.  In lieu of issuing  fractional  shares,  ATC shall  convert  the
holder's  right to receive ATC Common Stock  pursuant to the  provisions of this
Section  into a right to receive (i) the highest  whole  number of shares of ATC
Common  Stock to which the holder would  otherwise  be entitled,  plus (ii) cash
equal to the  fraction of a share of ATC Common  Stock to which the holder would
otherwise  be entitled  multiplied  by the Fair Market Value of one share of ATC
Common Stock as of the Effective  Time. As of the Effective Time, the holders of
TCT Units  outstanding  immediately  prior to the Effective  Time shall cease to
have any rights with  respect to such TCT Units,  except as  otherwise  provided
herein or by Applicable Law.

         3.2 Delivery of Merger  Consideration  At and after the Effective Time,
each TCT Member,  upon the  execution and delivery to ATC of a  certificate,  in
substantially  the form  heretofore  agreed upon by ATC and TCT, with respect to
such TCT Units and its ownership  thereof,  shall be entitled to receive (a) its
pro rata share of the Cash  Consideration  and (b) a certificate  for ATC Common
Stock representing the highest number of whole shares  constituting its pro rata
share of the ATC Stock  Consideration  and cash in an amount  sufficient to make
payment for any  fractional  share  constituting a part of its pro rata share of
ATC Stock Consideration, in each case representing the Merger Consideration with
respect to the TCT Units formerly held by such TCT Member in accordance with the
provisions of this Article, subject, however, to the provisions of the Indemnity
Escrow Agreement.  ATC shall be entitled to deduct and withhold from cash or ATC
Common Stock otherwise  payable  pursuant to this Agreement such amounts of cash
or ATC Common Stock as ATC shall deem necessary to satisfy any  requirement  for
deduction or  withholding  with respect to the making of such payment  under the
Code,  or any  provision of state,  local or foreign tax law. To the extent that
amounts are so withheld by ATC, such  withheld  amounts shall be treated for all
purposes of this  Agreement  as having been paid to the TCT Member in respect of
which such deduction and withholding was made by ATC.

         3.3 Option Securities and Convertible Securities; No Payment Rights. At
the  Effective  Time,  each  outstanding  Option  Security and each  Convertible
Security of TCT, if any, whether or not then exercisable for or convertible into
TCT Units or other TCT securities, outstanding immediately prior to the

                                       -4-

<PAGE>
Effective Time,  shall be canceled and retired and shall cease to exist, and the
holder thereof shall not be entitled to receive any consideration therefor.

         3.4 Determination of Merger Consideration. Not later than ten (10) days
prior to the Closing Date, TCT shall submit to ATC its preliminary determination
of the amount of the Merger  Consideration  determined  in  accordance  with the
provisions of Section 3.1. Within seven (7) days thereafter, ATC shall submit to
TCT its objections,  if any, to such  preliminary  determination,  specifying in
reasonable  detail the nature of such  objections.  The parties  shall use their
reasonable   business   efforts   to  agree   upon  the  amount  of  the  Merger
Consideration,  but in the event they are  unable to do so,  then (a) the Merger
shall be consummated (assuming that all other conditions thereto shall have been
satisfied),  (b)  the  Merger  Consideration  at the  Effective  Time  shall  be
comprised of the Cash Consideration and the ATC Stock  Consideration as provided
in this Section,  and (c) a post-Effective  Time adjusting cash payment (if any)
shall be made by ATC to the TCT  Members as  provided  in this  Section.  In the
event  the  parties  are  unable to agree as  aforesaid,  then (a) the ATC Stock
Consideration  at the  Effective  Time  shall  be the  ATC  Stock  Consideration
determined by TCT, and (b) the Cash Consideration at the Effective Time shall be
the Cash  Consideration  determined by TCT reduced by an amount equal to the sum
(the "Adjustment Holdback") of (i) the difference between the Cash Consideration
determined by TCT and that determined by ATC, and (ii) the difference (valued at
the Current Market Price) between the ATC Stock Consideration  determined by TCT
and that determined by ATC, in each case using Merger Considerations  determined
pursuant to the  provisions of Section 3.1. To the extent the parties are unable
to agree upon the amount of the Current Balance,  the Adjustment  Holdback shall
consist  of cash,  and to the extent  the  parties  are unable to agree upon the
aggregate amount of acquisition expense and capital expenditures of TCT referred
to in clause (ii) of the second sentence of Section 3.1, the Adjustment Holdback
shall  consist  of ATC Common  Stock and cash in the  proportions  specified  in
Section 3.1. Under such  circumstances,  TCT and ATC shall, within ten (10) days
following the Effective Time,  jointly  designate a nationally known independent
public  accounting  firm to be retained to  determine  the amount of the Current
Balance and aggregate amount of acquisition expenses and capital expenditures of
TCT  referred to in clause (ii) of the second  sentence of Section 3.1. The fees
and other expenses of retaining such independent public accounting firm shall be
borne  by ATC and TCT  (prior  to  Closing)  and  the  TCT  Members  (out of the
Adjustment   Holdback   after  the  Closing)  in  inverse   proportion   to  its
determination  of the contested  amount of the Merger  Consideration.  Such firm
shall report its conclusions  pursuant to this Section, and such report shall be
conclusive  on all  parties  to this  Agreement  and not  subject  to dispute or
review.  Upon  determination  by such  independent  accounting  firm (or  sooner
agreement of the Merger Consideration by the parties),  ATC shall deliver to the
TCT  Members,  as their  interests  may  appear,  the  amount of the  Adjustment
Holdback, if any, to which they are entitled, together with interest on the cash
portion thereof at the rate of ten percent (10%) per annum.


                                    ARTICLE 4

                     REPRESENTATIONS AND WARRANTIES OF TCT 

         All  representations  and  warranties,  unless  the  context  indicates
otherwise,  exclude RCC,  Prime and TTP which will be distributed by TCT to some
or all TCT Members prior to the Merger.  TCT hereby  represents  and warrants to
ATC and ATMC as follows:

                                       -5-

<PAGE>
         4.1  Organization  and  Business;   Power  and  Authority;   Effect  of
Transaction.

         (a) TCT is a limited liability company duly organized, validly existing
and in good standing under the laws of its jurisdiction of organization, has all
requisite power and authority  (limited  liability  company and other) to own or
hold under lease its properties and to conduct its business as now conducted and
is duly qualified and in good standing as a foreign limited liability company in
each  other  jurisdiction  (as shown on  Section  4.1(a)  of the TCT  Disclosure
Schedule) in which the  character  of the property  owned or leased by it or the
nature of its business or  operations  requires such  qualification,  except for
such  qualifications  the  failure  of which to obtain,  individually  or in the
aggregate, would not have a material adverse effect on TCT.

         (b)  TCT has all  requisite  power  and  authority  (limited  liability
company and other) necessary to enable it to execute and deliver, and to perform
its obligations  under, this Agreement and each Collateral  Document executed or
required to be executed by it pursuant  hereto or thereto and to consummate  the
Transactions;  and  the  execution,  delivery  and  performance  by TCT of  this
Agreement and each Collateral Document executed or required to be executed by it
pursuant  hereto or thereto have been duly  authorized by all requisite  limited
liability  company  or  other  action  on the  part  of TCT,  including  without
limitation the requisite  approval of the TCT Members,  if any. The  affirmative
vote of the  holders of TCT Units  representing  a majority  of the  outstanding
voting power of all TCT Units is sufficient to approve and adopt this  Agreement
and the  transactions  contemplated by this  Agreement.  This Agreement has been
duly executed and delivered by TCT and constitutes, and each Collateral Document
executed or  required  to be  executed  by it  pursuant  hereto or thereto or to
consummate the Transactions  when executed and delivered by TCT will constitute,
legal,  valid and binding  obligations of TCT,  enforceable  in accordance  with
their  respective  terms,  except  as  such  enforceability  may be  subject  to
bankruptcy,  moratorium,  insolvency,   reorganization,   arrangement,  voidable
preference,  fraudulent  conveyance  and  other  similar  Laws  relating  to  or
affecting  the rights of creditors  and except as the same may be subject to the
effect of general principles of equity.

         (c)  Except  as set  forth  in  Section  4.1(c)  of the TCT  Disclosure
Schedule,  neither the  execution  and delivery by TCT of this  Agreement or any
Collateral Document executed or required to be executed by it pursuant hereto or
thereto,  nor the  consummation  of the  Transactions,  nor compliance  with the
terms, conditions and provisions hereof or thereof by TCT:

                  (i) will conflict with, or result in a breach or violation of,
         or  constitute  a default  under,  any  Organic  Document of TCT or any
         Applicable  Law,  or will  conflict  with,  or  result  in a breach  or
         violation of, or constitute a default under, or permit the acceleration
         of any obligation or liability in, or but for any requirement of giving
         of notice or passage of time or both would  constitute  such a conflict
         with,  breach or  violation  of, or default  under,  or permit any such
         acceleration in, any Material Agreement of TCT; or

                  (ii)  will  require  TCT to make or  obtain  any  Governmental
         Authorization, Governmental Filing or Private Authorization, except (A)
         filings under the Hart-Scott-Rodino Act, (B) for FCC approvals, and (C)
         the filing of the Certificate of Merger with the Delaware  Secretary of
         State.

         (d)  Except  as set  forth  in  Section  4.1(d)  of the TCT  Disclosure
Schedule, TCT does not have any Subsidiaries, and each such disclosed Subsidiary
is (i)  wholly-owned  unless  noted  otherwise  in  Section  4.1(d)  of the  TCT
Disclosure Schedule, (ii) a corporation or other Entity which is duly organized,
validly  existing and in good standing under the laws of the respective state of
incorporation  or formation set forth opposite its name on Section 4.1(d) of the
TCT Disclosure Schedule, and (iii) duly qualified and in good

                                       -6-

<PAGE>
standing as a foreign corporation or Entity in each other jurisdiction (as shown
on Section 4.1(d) of the TCT Disclosure  Schedule) in which the character of the
property  owned or leased  by it or the  nature of its  business  or  operations
requires  such  qualification,   with  full  power  and  authority   (corporate,
partnership,  limited  liability  company and other) to carry on the business in
which it is  engaged,  except for such  qualifications  the  failure of which to
obtain,  individually  or in the  aggregate,  would not have a material  adverse
effect on TCT. TCT owns, directly or indirectly,  all of the outstanding capital
stock or equity  interests  (as shown in  Section  4.1(d) of the TCT  Disclosure
Schedule)  of  each  Subsidiary,  free  and  clear  of  all  Liens  (except  for
restrictions  on  transfer of  partnership  interests  set forth in  partnership
agreements,  as listed on Section 4.1(d) of the TCT Disclosure Schedule,  and as
described in the notes to the TCT Financial  Statements),  and all such stock or
other equity  interests has been duly authorized and validly issued and is fully
paid and  nonassessable.  Except  as set  forth  in  Section  4.1(d)  of the TCT
Disclosure  Schedule,  there are no outstanding Option Securities or Convertible
Securities,  or agreements or understandings of any nature whatsoever,  relating
to the authorized and unissued or outstanding  capital stock or equity interests
of any  Subsidiary  of  TCT.  Except  as the  context  otherwise  requires,  the
representations  and  warranties of TCT set forth in this Article shall apply to
each of such  Subsidiaries with the same force and effect as though each of them
were named in each Section of this Article.

         4.2 Financial and Other Information.  TCT has heretofore made available
to ATC copies of the  financial  statements  of TCT listed in Section 4.2 of the
TCT  Disclosure  Schedule (the "TCT  Financial  Statements").  The TCT Financial
Statements,  including  in each case the notes  thereto,  have been  prepared in
accordance  with GAAP  applied on a  consistent  basis  throughout  the  periods
covered  thereby,  except as otherwise  noted  therein,  are true,  accurate and
complete in all material respects, and fairly present the consolidated financial
condition and the  consolidated  results of operations  and cash flow of TCT, on
the bases  therein  stated,  as of the  respective  dates  thereof,  and for the
respective periods covered thereby subject,  in the case of unaudited  financial
statements,  to normal nonmaterial year-end audit adjustments and accruals.  The
Monthly Tower Revenue Run Rate of TCT for the month of October 1998 was not less
than $1,050,000.

         4.3 Material Statements and Omissions;  Absence of Events.  Neither any
representation  or  warranty  made by TCT  contained  in this  Agreement  or any
certificate,  document or other  instrument  furnished or to be furnished by TCT
pursuant to the provisions  hereof nor the TCT Disclosure  Schedule  contains or
will contain any untrue  statement  of a material  fact or omits or will omit to
state any  material  fact  required to make any  statement  contained  herein or
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading.  Since the date of the most recent financial statements constituting
a part  of the TCT  Financial  Statements,  except  to the  extent  specifically
described  in  Section  4.3 of the TCT  Disclosure  Schedule,  there has been no
change with  respect to TCT which has had, or (so far as TCT can now  reasonably
foresee) is likely to have, a material  adverse effect on TCT. There is no Event
known to TCT which has had,  or (so far as TCT can now  reasonably  foresee)  is
likely  to  have,  a  material  adverse  effect  on TCT,  except  to the  extent
specifically described in Section 4.3 of the TCT Disclosure Schedule.

         4.4      Title to Properties; Leases.

         (a)  Section  4.4(a) of the TCT  Disclosure  Schedule  contains a true,
accurate and complete  description  of real property  owned by TCT. TCT has good
indefeasible,  marketable and insurable  title to all such real property  (other
than easement and leasehold real property) and good  indefeasible and marketable
title  to all  of  its  other  property  and  assets,  tangible  and  intangible
(collectively,  the "TCT Assets");  all of the TCT Assets are so owned,  in each
case, free and clear of all Liens,  except (i) Permitted  Liens,  and (ii) Liens
set forth on Section 4.4(a) of the TCT Disclosure Schedule (which Liens shall be
released prior to the Closing). Except for financing statements evidencing Liens
referred to in the immediately preceding sentence (a true, accurate and complete
list and description of which is set forth in

                                       -7-
<PAGE>
Section 4.4(a) of the TCT Disclosure  Schedule),  no financing  statements under
the Uniform  Commercial  Code and no other  filing  which names TCT as debtor or
which  covers or purports to cover any of the TCT Assets is on file in any state
or  other  jurisdiction,  and TCT has not  signed  or  agreed  to sign  any such
financing  statement or filing or any  agreement  authorizing  any secured party
thereunder to file any such financing  statement or filing.  Except as disclosed
in Section 4.4(a) of the TCT Disclosure  Schedule,  all improvements on the real
property  owned or  leased  by TCT  which  improvements  are owned by TCT are in
compliance with applicable  zoning,  wetlands and land use laws,  ordinances and
regulations  and  applicable  title  covenants,  conditions,   restrictions  and
reservations  in all respects  necessary to conduct the  operations as presently
conducted,  except for any instances of non-compliance which, individually or in
the  aggregate,  do not and will not have a material  adverse  effect on the TCT
Assets  taken as a whole.  Except  as  disclosed  in  Section  4.4(a) of the TCT
Disclosure Statement,  all such improvements comply in all material aspects with
all Applicable Laws,  Governmental  Authorizations  and Private  Authorizations.
Except as  disclosed  in Section  4.4(a) of the TCT  Disclosure  Statement,  and
except as would not,  individually or in the aggregate,  have a material adverse
effect on TCT, all of the  transmitting  towers,  ground  radials,  guy anchors,
transmitting  buildings and related  improvements,  if any,  located on the real
property  owned or leased by TCT are  located  entirely  on such real  property.
There is no pending or, to TCT's knowledge, threatened or contemplated action to
take by eminent  domain or otherwise  to condemn any  material  part of any real
property  owned or leased by TCT.  Except as set forth in Section  4.4(a) of the
TCT Disclosure Schedule,  such transmitting towers, ground radials, guy anchors,
transmitting  buildings and related  improvements  and other  material  items of
personal  property,  including  equipment  are,  in  TCT's  reasonable  business
judgment,  in a  state  of good  repair  and  maintenance  and  sound  operating
condition,  normal  wear and tear  excepted,  have been  maintained  in a manner
consistent with generally accepted standards of sound engineering practice, and,
currently  permit the TCT  Business to be operated in all  material  respects in
accordance  with the terms and conditions of all Applicable  Laws,  Governmental
Authorizations and Private Authorizations.

         (b)  Section  4.4(b) of the TCT  Disclosure  Schedule  contains a true,
accurate and complete  description  of all Leases under which any real  property
used in the business of TCT (the "TCT  Business") is leased to TCT by any Person
or by TCT to any Person.  Except as otherwise set forth in Section 4.4(b) of the
TCT  Disclosure  Schedule,  each Lease  under  which TCT holds real or  personal
property  constituting  a part of the  TCT  Assets  has  been  duly  authorized,
executed and delivered by TCT or its predecessor in interest  thereunder and, to
its  knowledge,  each of the other parties  thereto,  and is a legal,  valid and
binding  obligation  of TCT,  and, to its  knowledge,  each of the other parties
thereto, enforceable in accordance with its terms, except as such enforceability
may be limited by bankruptcy,  moratorium, insolvency and similar Laws affecting
the rights and remedies of creditors and obligations of debtors generally and by
general  principles  of  equity.  Except as would  not,  individually  or in the
aggregate,  have a material adverse effect on the TCT Assets or the TCT Business
taken as a whole, TCT has a valid leasehold  interest in and enjoys peaceful and
undisturbed possession under all Leases pursuant to which it holds any such real
property or tangible personal  property,  subject to the terms of each Lease and
Applicable  Law. None of the fixed assets or equipment  comprising a part of the
TCT Assets is subject to contracts of sale, and none is held by TCT as lessee or
as conditional  sales vendee under any Lease or  conditional  sales contract and
none is subject to any title retention agreement, except as set forth in Section
4.4(b) of the TCT Disclosure  Schedule.  True,  accurate and complete  copies of
each of such Leases will be made  available  by TCT to ATC and TCT will  provide
ATC with photocopies of all such Leases requested by ATC (or true,  accurate and
complete  descriptions  thereof have been set forth in Section 4.4(b) of the TCT
Disclosure Schedule,  with respect to those that are oral). Except as would not,
individually  or in the  aggregate,  have a material  adverse  effect on the TCT
Assets or the TCT  Business  taken as a whole,  all of such Leases are valid and
subsisting  and in full force and effect;  neither TCT nor, to TCT's  knowledge,
any other party  thereto,  has failed to duly  comply  with all of the  material
terms and  conditions of each such Lease or has done or performed,  or failed to
do or perform (and no Claim is pending or, to the  knowledge of TCT,  threatened
to the effect that TCT has not

                                       -8-
<PAGE>
so complied, done and performed or failed to do and perform) any act which would
invalidate or provide  grounds for the other party thereto to terminate (with or
without  notice,  passage of time or both)  such  Leases or impair the rights or
benefits, or increase the costs, of TCT under any of such Leases in any material
respect.

         4.5  Compliance  with  Private  Authorizations.  Section 4.5 of the TCT
Disclosure   Schedule  sets  forth  a  true,  accurate  and  complete  list  and
description of each Private  Authorization which individually is material to the
TCT Assets or the TCT Business. TCT has obtained all Private Authorizations that
are necessary for the ownership or operation of the TCT Assets or the conduct of
the TCT Business, as currently conducted or proposed to be conducted on or prior
to the Closing Date, which, if not obtained and maintained,  could, individually
or in the aggregate, have a material adverse effect on TCT. Except as would not,
individually  or in the  aggregate,  have a material  adverse  effect on the TCT
Assets or the TCT Business taken as a whole, all of such Private  Authorizations
are valid and in good  standing and are in full force and effect.  TCT is not in
material breach or violation of, or in default in the performance, observance or
fulfillment  of,  any such  Private  Authorization,  and no Event  exists or has
occurred which  constitutes,  or but for any  requirement of giving of notice or
passage of time or both would constitute,  such a material breach,  violation or
default,  under any such Private  Authorization.  No such Private  Authorization
that is material to the TCT  Business is the subject of any pending or, to TCT's
knowledge, threatened attack, revocation or termination.

         4.6 Compliance with Governmental Authorizations and Applicable Law.

         (a)  Section  4.6(a) of the TCT  Disclosure  Schedule  contains a true,
complete and accurate  description of each material  Governmental  Authorization
required under  Applicable Law (i) to own and operate the TCT Assets and conduct
the TCT Business, as currently conducted or proposed to be conducted on or prior
to the Closing  Date,  all of which are in full force and effect or (ii) that is
necessary to permit TCT to execute and deliver this Agreement and to perform its
obligations hereunder. TCT has obtained all Governmental Authorizations that are
necessary for the ownership or operation of the TCT Assets or the conduct of the
TCT Business as now conducted and which, if not obtained and maintained,  would,
individually or in the aggregate,  have any material adverse effect on TCT. None
of  the  Governmental  Authorizations  listed  in  Section  4.6(a)  of  the  TCT
Disclosure  Schedule is subject to any restriction or condition that would limit
in any material  respect the  ownership or  operations  of the TCT Assets or the
conduct of the TCT Business as currently conducted,  except for restrictions and
conditions generally applicable to Governmental Authorizations of such type. The
Governmental  Authorizations  listed in  Section  4.6(a)  of the TCT  Disclosure
Schedule  are valid and in good  standing,  are in full force and effect and are
not  impaired  in any  material  respect  by any act or  omission  of TCT or its
officers, directors, employees or agents, and the ownership and operation of the
TCT Assets and the conduct of the TCT Business are in accordance in all material
respects with the Governmental  Authorizations.  All material reports, forms and
statements  required to be filed by TCT with all Authorities with respect to the
TCT Business have been filed and are true, complete and accurate in all material
respects.  No such Governmental  Authorization is the subject of any pending or,
to TCT's  knowledge,  threatened  challenge or proceeding to revoke or terminate
any such Governmental Authorization.

         (b) Except as otherwise specifically set forth in Section 4.6(b) of the
TCT Disclosure  Schedule,  since January 1, 1998, TCT has conducted its business
and owned and operated its property and assets in accordance with all Applicable
Laws and Governmental Authorizations,  except for such breaches,  violations and
defaults  as,  individually  or in the  aggregate,  have  not  had  and  are not
reasonably  likely to have a material adverse effect on TCT. Except as otherwise
specifically  described in Section 4.6(b) of the TCT Disclosure Schedule, TCT is
not is in and is not charged by any Authority with, and, to TCT's knowledge,

                                       -9-
<PAGE>
is not threatened or under  investigation  by any Authority with respect to, any
breach or violation of, or default in the performance, observance or fulfillment
of, any Applicable Law relating to the ownership and operation of the TCT Assets
or the conduct of the TCT Business which will, individually or in the aggregate,
have a  material  adverse  effect  on  TCT.  Except  as  otherwise  specifically
described in Section 4.6(b) of the TCT Disclosure  Schedule,  no Event exists or
has occurred, which constitutes,  or but for any requirement of giving of notice
or  passage  of time or both  would  constitute,  such a  breach,  violation  or
default, under any Governmental  Authorization or any Applicable Law, except for
such breaches, violations or defaults as, individually or in the aggregate, have
not had and  reasonably  would not have a material  adverse  effect on TCT. With
respect to matters, if any, of a nature referred to in Section 4.6(b) of the TCT
Disclosure  Schedule,  except as  otherwise  specifically  described  in Section
4.6(b) of the TCT  Disclosure  Schedule,  all such  information  and matters set
forth in the TCT  Disclosure  Schedule,  if  adversely  determined  against TCT,
individually  or in the  aggregate,  would not  reasonably be expected to have a
material adverse effect on TCT.

         (c)  Except  as set  forth  in  Section  4.6(c)  of the TCT  Disclosure
Schedule,  there have not been since the formation of TCT and there are no Legal
Actions of any kind pending or, to the  knowledge of TCT,  threatened at law, in
equity or before any Authority  against TCT or any of its officers or Management
Committee  representatives  relating to the  ownership  or  operation of the TCT
Assets or the conduct of the TCT Business.  Such  disclosed  Legal  Actions,  if
determined  adversely  to  TCT,  individually  or in the  aggregate,  would  not
reasonably  be  expected  to not have a  material  adverse  effect on TCT;  such
disclosed Legal Actions could not materially and adversely affect the ability of
TCT to perform its obligations under this Agreement, nor are there any judgments
or orders outstanding against TCT that could have such effect.

         4.7 Intangible Assets.  Section 4.7 of the TCT Disclosure Schedule sets
forth a true, accurate and complete  description of all Intangible Assets (other
than Governmental Authorizations and Private Authorizations and Leases) relating
to the  ownership  and  operation  of the TCT  Assets or the  conduct of the TCT
Business held or used by TCT,  including without  limitation the nature of TCT's
interest in each and the extent to which the same have been duly  registered  in
the offices as indicated therein.  Except as set forth in Section 4.7 of the TCT
Disclosure Schedule,  no Intangible Assets (except Governmental  Authorizations,
Private Authorizations, and the Intangible Assets so set forth) are required for
the  ownership or operation of the TCT Assets or the conduct of the TCT Business
as currently owned, operated and conducted or proposed to be owned, operated and
conducted  on or prior to the  Closing  Date.  TCT does not,  to its  knowledge,
wrongfully  infringe  upon or  unlawfully  use any  Intangible  Assets  owned or
claimed  by  another,  and TCT has not  received  any  notice  of any  claim  or
infringement relating to any such Intangible Asset.

         4.8  Related  Transactions.  TCT  is  not a  party  or  subject  to any
Contractual  Obligation relating to the ownership or operation of the TCT Assets
or the  conduct  of the TCT  Business  between  TCT and any of its  officers  or
Management Committee  representatives or, to the knowledge of TCT, any member of
the Immediate  Family of any thereof or any  Affiliate of any of the  foregoing,
including  without  limitation  any  Contractual  Obligation  providing  for the
furnishing  of  services  to or by,  providing  for  rental of  property,  real,
personal or mixed,  to or from,  or  providing  for the lending or  borrowing of
money to or from or otherwise  requiring  payments to or from,  any such Person,
other than (a)  Employment  Arrangements  listed or described in Section 4.14 of
the TCT Disclosure Schedule, (b) Contractual  Obligations between TCT and any of
its officers,  Management Committee  representatives or Affiliates of TCT or any
of the foregoing,  that will be terminated,  at no cost or expense to ATC, prior
to the  Closing,  or (c) as  specifically  set forth in  Section  4.8 of the TCT
Disclosure Schedule.

         4.9 Insurance.  TCT  maintains,  with respect to the TCT Assets and the
TCT Business, policies of fire and extended coverage and casualty, liability and
other forms of  insurance  in such  amounts and against such risks and losses as
are set forth in Section 4.9 of the TCT Disclosure Schedule.

                                      -10-
<PAGE>

         4.10 Tax Matters.  TCT has, in  accordance  with all  Applicable  Laws,
filed all Tax  Returns  that it was  required  to file,  and has  paid,  or made
adequate  provision  on the most recent  balance  sheet  forming part of the TCT
Financial  Statements  for the payment of, all material  Taxes which have or may
become due and payable pursuant to said Tax Returns other than those Taxes being
contested  in good faith for which  adequate  provision  has been made.  The Tax
Returns of TCT have been prepared in all material  respects in  accordance  with
all Applicable Laws. All material Taxes which TCT is required by law to withhold
and collect have been duly withheld and collected, and have been paid over, in a
timely manner,  to the proper Taxing  Authorities to the extent due and payable.
TCT has not executed any waiver to extend,  or otherwise taken or failed to take
any action that would have the effect of extending,  the  applicable  statute of
limitations in respect of any Tax  liabilities of TCT for the fiscal years prior
to and including the most recent fiscal year.  Adequate  provision has been made
on the most recent  balance sheet  forming part of the TCT Financial  Statements
for all Taxes accrued  through the date of such balance sheet in accordance with
GAAP  whether  disputed  or not,  and there  are,  to TCT's  knowledge,  no past
transactions  or matters  which could result in  additional  Taxes of a material
nature being imposed on TCT for which an adequate  reserve has not been provided
on such balance  sheet.  TCT has at all times been  classified  as a partnership
under the Code and,  except as set forth in Section  4.10 of the TCT  Disclosure
Schedule,  has been  similarly  classified  under all state and local income Tax
Laws to which it is subject;  TCT has never been a publicly  traded  partnership
treated as a  corporation  under  Section 7704 of the Code,  and,  except as set
forth in Section  4.10 of TCT  Disclosure  Schedule,  has never  been  similarly
classified under state and local income Tax Laws to which it is subject. TCT has
never  been a member of any  "affiliated  group"  of  corporations,  within  the
meaning of Section  1504(a) of the Code.  TCT is not a party to any tax  sharing
agreement or arrangement.

         At all  times  during  its  existence,  each  member  of TCT has been a
"United States person" as defined in Section  7701(a)(30) of the Code as then in
effect.  TCT has  complied  with  all  material  withholding  obligations  under
Sections 1445(e)(1) or 1446 of the Code, and under any comparable  provisions of
state or local income Tax Laws.

         Except as disclosed in Section 4.10 of the TCT Disclosure  Schedule and
for  Taxes of a nature  referred  to in  Section  10.2,  the  completion  of the
Transactions  will not (either alone or upon the occurrence of any additional or
subsequent  Event)  result in TCT  being  subject  to  additional  Taxes  which,
individually or in the aggregate, are material.

         4.11     Employee Retirement Income Security Act of 1974.

         (a) TCT (which for  purposes of this  Section  shall  include any ERISA
Affiliate of TCT)  currently  sponsors,  maintains and  contributes  only to the
Plans  and  Benefit  Arrangements  set  forth  in  Section  4.11(a)  of the  TCT
Disclosure  Schedule.  TCT has delivered or made available to ATC true, complete
and correct copies of (i) each Plan and Benefit  Arrangement (or, in the case of
any unwritten Plans or Benefit Arrangements,  reasonable  descriptions thereof),
(ii) the two most recent annual  reports on Form 5500  (including  all schedules
and attachments thereto) filed with the Internal Revenue Service with respect to
each Plan or Benefit  Arrangement (if any such report was required by Applicable
Law), (iii) the most recent summary plan  description (or similar  document) for
each Plan for which such a summary plan  description  is required by  Applicable
Law or was otherwise  provided to plan participants or  beneficiaries,  and (iv)
each trust  agreement  and  insurance  or annuity  contract or other  funding or
financing  arrangement  relating to any Plan. To the knowledge of TCT, each such
Form 5500 and each such summary plan description (or similar  document) did not,
as  of  the  date  of  the  Original  Merger  Agreement,  contain  any  material
misstatements.  Except as set forth in  Section  4.11(a)  of the TCT  Disclosure
Schedule, TCT does not contribute to or have an obligation to contribute to, and
has not at any time contributed to or had an obligation to contribute to,

                                      -11-
<PAGE>

and no Plan listed in Section 4.11(a) of the TCT Disclosure  Schedule is, (i) an
employee pension benefit plan within the meaning of Section 3(2) of ERISA,  (ii)
a  Multiemployer  Plan,  or (iii) a Plan  subject  to  Section  412 of the Code,
Section  302 of ERISA  or Title IV of  ERISA.  TCT has no  actual  or  potential
liability under Title IV of ERISA.  TCT does not maintain any Plan that provides
for post-retirement  medical or life insurance  benefits,  and TCT does not have
any obligation or liability with respect to any such Plan previously  maintained
by TCT,  except as the provisions of COBRA may apply to any former  employees of
TCT. Except as set forth in Section 4.11(a) of the TCT Disclosure  Schedule,  as
to all Plans and  Benefit  Arrangements  listed in  Section  4.11(a)  of the TCT
Disclosure Schedule:

                  (i) all such Plans and  Benefit  Arrangements  comply and have
         been administered in form and in operation,  in all material  respects,
         in accordance with their  respective terms and with all Applicable Laws
         and TCT has not  received  any  notice  from any  Authority  that it is
         currently or is going to be disputing or investigating such compliance;

                  (ii)  none of the  assets  of any such  Plan are  invested  in
         employer securities or employer real property;

                  (iii)  there are no Claims  (other  than  routine  Claims  for
         benefits  or actions  seeking  quali fied  domestic  relations  orders)
         pending or, to TCT's knowledge,  threatened involving such Plans or the
         assets of such Plans, and, to TCT's knowledge, no facts exist which are
         reasonably  likely to give rise to any such Claims  (other than routine
         Claims for benefits or actions  seeking  qualified  domestic  relations
         orders);

                  (iv) all  material  contributions  to, and  material  payments
         from, the Plans and Benefit Arrangements that may have been required to
         be  made  in  accordance  with  the  terms  of the  Plans  and  Benefit
         Arrangements,  and any applicable collective bargaining agreement, have
         been made. All such  contributions to, and payments from, the Plans and
         Benefit  Arrangements,  except  those  payments to be made from a trust
         qualified  under  Section  401(a) of the Code,  for any  period  ending
         before the Closing Date that are not yet,  but will be,  required to be
         made, will be properly accrued and reflected on the financial books and
         records of TCT;

                  (v) no Event has occurred  which would result in imposition on
         TCT of any  material  liability  for (A) any breach of  fiduciary  duty
         damages  under  Section  409 of  ERISA,  (B) a civil  penalty  assessed
         pursuant to subsections  (c), (i) or (l) of Section 502 of ERISA or (C)
         a tax imposed pursuant to Chapter 43 of Subtitle D of the Code;

                  (vi) TCT has not  incurred  any  material  liability to a Plan
         (other than for contributions not yet due) which liability had not been
         fully paid or accrued for payment as of the date of the Original Merger
         Agreement;

                  (vii) except as otherwise set forth in Section  4.11(a) of the
         TCT Disclosure  Schedule,  no current or former employee of TCT will be
         entitled to any additional  benefits or any acceleration of the time of
         payment  or  vesting  of  any  benefits   under  any  Plan  or  Benefit
         Arrangement  as a  result  of the  transactions  contemplated  by  this
         Agreement;

                  (viii) no compensation  payable by TCT to any of its employees
         under any existing Plan or Benefit Arrangement  (including by reason of
         the transactions  contemplated  hereby) will be subject to disallowance
         under Section 162(m) of the Code; and

                                      -12-
<PAGE>
                  (ix) any amount  that could be  received  (whether  in cash or
         property or by virtue of the vesting of property) as a result of any of
         the  transactions  contemplated  by  this  Agreement  by any  employee,
         officer,   director  or   independent   contractor  of  TCT  who  is  a
         "disqualified   individual"  (as  such  term  is  defined  in  proposed
         Regulation Section 1.280G-1) under any employment arrangement would not
         be  characterized  as an "excess  parachute  payment"  (as such term is
         defined in Section 280G(b)(1) of the Code),  except for any amount that
         is approved by the stockholders of TCT on or before the Closing Date in
         the manner provided in Section 280G(b)(5) of the Code.

         (b) The  execution,  delivery and  performance by TCT of this Agreement
and the Collateral Documents executed or required to be executed by TCT pursuant
hereto and  thereto  will not  involve  any  prohibited  transaction  within the
meaning of ERISA or Section  4975 of the Code with respect to any Plan listed in
Section 4.11(a) of the TCT Disclosure Schedule.

         4.12 Solvency. As of the execution and delivery of this Agreement,  TCT
is,  and  immediately  prior  to and  immediately  after  giving  effect  to the
consummation of the Merger will be, Solvent.

         4.13 Bank Accounts,  Etc.  Section 4.13 of the TCT Disclosure  Schedule
contains  a true,  accurate  and  complete  list as of the date of the  Original
Merger Agreement of all banks,  trust companies,  savings and loan  associations
and  brokerage  firms in which TCT has an account or a safe  deposit box and the
names of all Persons authorized to draw thereon,  to have access thereto,  or to
authorize  transactions therein, the names of all Persons, if any, holding valid
and  subsisting  powers of attorney  from TCT and a summary  statement as to the
terms  thereof.  TCT agrees that prior to the  Closing  Date it will not make or
permit to be made any change affecting any bank, trust company, savings and loan
association,  brokerage  firm or safe deposit box or in the names of the Persons
authorized to draw thereon, to have access thereto or to authorize  transactions
therein or in such powers of attorney,  or open any additional accounts or boxes
or grant any additional powers of attorney, without in each case first notifying
ATC in writing.

         4.14  Employment and Consulting  Arrangements.  Section 4.14 of the TCT
Disclosure  Schedule  contains a true,  accurate  and  complete  list of all TCT
employees and consultants,  exclusive of consultants  whose services for TCT are
terminable within thirty (30) days without liability,  penalty or payment of any
kind by TCT or any  Affiliate of TCT (the "TCT  Employees"),  together with each
such  Person's  title or the capacity in which he or she is employed or retained
and  each  such  Person's  compensation.  TCT has no  obligation  or  liability,
contingent or other,  under any  Employment  Arrangement  with any TCT Employee,
other than (i) those listed or  described in Section 4.14 of the TCT  Disclosure
Schedule,  (ii) those incurred in the ordinary and usual course of business,  or
(iii)  such  obligations  or  liabilities  as do not and will not  have,  in the
aggregate,  any material  adverse effect on TCT.  Except as described in Section
4.14 of the TCT  Disclosure  Schedule,  (a) none of the TCT Employees is now, or
since  its  organization  has  been,  represented  by any  labor  union or other
employee collective bargaining organization, and TCT is not, and never has been,
a party to any labor or other  collective  bargaining  agreement with respect to
any of the TCT  Employees,  (b) there are no  pending  grievances,  disputes  or
controversies  with any union or any other  employee  or  collective  bargaining
organization  of such  employees,  or  threats of  strikes,  work  stoppages  or
slowdowns or any pending demands for collective  bargaining by any such union or
other organization, and (c) neither TCT nor any of such employees is now, or has
since its organization  been,  subject to or involved in or, to TCT's knowledge,
threatened with, any union elections, petitions therefor or other organizational
activities, in each case with respect to the TCT Employees. TCT has performed in
all  material  respects  all  obligations  required  to be  performed  under all
Employment  Arrangements  and is not in material  breach or  violation  of or in
material  default or arrears  under any of the terms,  provisions  or conditions
thereof.

                                      -13-
<PAGE>

         4.15 Material Agreements.  Listed on Section 4.15 of the TCT Disclosure
Schedule are all Material Agreements (other than Leases,  Private Authorizations
and Governmental  Authorizations)  relating to the ownership or operation of the
TCT Assets or the  conduct of the TCT  Business or to which TCT is a party or to
which it is bound or to which any of the TCT Assets is subject.  True,  accurate
and complete copies of each of such Material Agreements have been made available
by TCT to ATC, and TCT will provide ATC with  photocopies  of all such  Material
Agreements requested by ATC (or true, accurate and complete descriptions thereof
have been set forth in Section 4.15 of the TCT Disclosure  Schedule with respect
to Material Agreements comprised of site leases and site licenses granted by TCT
to third parties and with respect to Material  Agreements that are oral). All of
such Material Agreements are valid, binding and legally enforceable  obligations
of TCT  and,  to its  knowledge,  all  other  parties  thereto,  except  as such
enforceability may be limited by bankruptcy,  moratorium, insolvency and similar
Laws  affecting the rights and remedies of creditors and  obligations of debtors
generally and by general principles of equity. Except as would not, individually
or in the aggregate, have a material adverse effect on the TCT Assets or the TCT
Business taken as a whole,  neither TCT nor, to its  knowledge,  any other party
thereto, has failed to duly comply with all of the material terms and conditions
of each such  Material  Agreement or has done or  performed,  or failed to do or
perform  (and no Claim is pending or, to the  knowledge  of TCT,  threatened  in
writing to the effect that TCT has not so complied, done and performed or failed
to do and perform)  any act which would  invalidate  or provide  grounds for the
other party  thereto to terminate  (with or without  notice,  passage of time or
both) such  Material  Agreement or impair the rights or benefits,  or materially
increase the costs, of TCT under any of such Material Agreement.

         4.16 Ordinary Course of Business. TCT, from the date of the most recent
TCT Financial  Statements to the date of the Original Merger  Agreement,  except
(i) as may be described on Section 4.16 of the TCT Disclosure Schedule,  (ii) as
may be required or expressly  contemplated  by the terms of this  Agreement,  or
(iii) as may be described in the TCT Financial  Statements,  including the notes
thereto:

                  (a) has operated its business in all material  respects in the
         normal,  usual and customary  manner in the ordinary and regular course
         of business, consistent with prior practice;

                  (b) except in each case in the  ordinary  course of  business,
         consistent with prior practice:

                           (i) has not  incurred  any  obligation  or  liability
                  (fixed,  contingent or other)  individually  having a value in
                  excess of $50,000;

                           (ii)  has  not  sold  or  otherwise  disposed  of  or
                  contracted  to  sell  or  otherwise  dispose  of  any  of  its
                  properties or assets having a value in excess of $50,000;

                           (iii) has not entered into any individual  commitment
                  having a value in excess of $50,000; and

                           (iv)     has not canceled any debts or claims;

                  (c) has not created or permitted to be created any Lien on any
         of the TCT Assets, except for Permitted Liens;

                  (d) has not made or  committed  to make any  additions  to its
         property or any purchases of equipment,  except in the ordinary  course
         of business consistent with past practice or for normal maintenance and
         replacements;

                                      -14-

<PAGE>
                  (e) has not  increased the  compensation  payable or to become
         payable  to  any of the  TCT  Employees  other  than  increases  in the
         ordinary course of business, or otherwise materially altered,  modified
         or changed the terms of their employment;

                  (f) has not suffered any material damage,  destruction or loss
         (whether or not covered by insurance) or any  acquisition  or taking of
         property by any Authority;

                  (g) has not waived any rights of material  value  without fair
         and adequate consideration;

                  (h) has not experienced any work stoppage;

                  (i) except in the ordinary course of business, has not entered
         into,  amended or  terminated  any Lease,  Governmental  Authorization,
         Private Authorization, Material Agreement or Employment Arrangement, or
         any transaction, agreement or arrangement with any Affiliate of TCT;

                  (j) has not  issued or sold,  or agreed to issue or sell,  any
         shares  of TCT  Units,  other  shares  of  capital  stock,  Convertible
         Securities or Option Securities;

                  (k) has not made, paid or declared any Distribution; and

                  (l) has not entered into any transactions or series of related
         transactions  which individually or in the aggregate is material to the
         TCT Assets or the TCT Business.

         4.17  Material  and  Adverse  Restrictions.  TCT is not a  party  to or
subject to, nor is any of the TCT Assets subject to, any Employment Arrangement,
Lease, Material Agreement or Private Authorization which, individually or in the
aggregate,  has  had  or,  as far as TCT can now  reasonably  foresee,  have,  a
material  adverse effect on TCT,  except as set forth in Section 4.17 of the TCT
Disclosure  Schedule and except for matters  affecting the  communications  site
industry  generally  and  assuming  the TCT  Business  continues  to be operated
substantially as in the past.

         4.18  Broker or Finder.  No Person  assisted  in or  brought  about the
negotiation of this Agreement or the Merger in the capacity of broker,  agent or
finder or in any similar capacity on behalf of TCT or any TCT Member.

         4.19 Environmental Matters.  Except as set forth in Section 4.19 of the
TCT Disclosure Schedule, TCT:

                  (a) has not been notified that it is potentially liable under,
         has not received any request for  information  or other  correspondence
         concerning its potential liability with respect to any site or facility
         under,  and,  to TCT's  knowledge,  is not a  "potentially  responsible
         party" under, the Comprehensive  Environmental  Response,  Compensation
         and  Liability  Act of 1980,  as  amended,  the  Resource  Conservation
         Recovery Act, as amended, or any similar state Law;

                  (b) has not  entered  into or  received  any  consent  decree,
         compliance  order  or  administrative  order  issued  pursuant  to  any
         Environmental Law;

                  (c) is  not a  party  in  interest  or in  default  under  any
         judgment,  order, writ,  injunction or decree of any Final Order issued
         pursuant to any Environmental Law;

                                      -15-
<PAGE>
                  (d) has, to its knowledge, obtained all material Environmental
         Permits required under  Environmental  Laws, and has filed all material
         applications, notices and other documents required to be filed prior to
         the date of the Original Merger  Agreement to effect the timely renewal
         or issuance of all Environmental Permits for the continued ownership or
         operation  of the TCT  Assets or  conduct  of the TCT  Business  in the
         manner currently owned, operated and conducted or proposed to be owned,
         operated and conducted prior to the Closing Date;

                  (e)  is in  compliance  in  all  material  respects  with  all
         Environmental  Laws, and is not the subject of or, to TCT's  knowledge,
         threatened  with any Legal  Action  involving  a demand for  damages or
         other  potential  liability,   including  any  Lien,  with  respect  to
         violations or breaches of any Environmental Law;

                  (f) has not conducted or received any site  assessment,  audit
         or other  investigation  as to  material  environmental  matters at any
         property currently owned, leased, operated or occupied by TCT;

                  (g) has not installed or used any above ground or  underground
         storage  tanks,  friable  asbestos,  polychlorinated  biphenyls or urea
         formaldehyde foam insulation on any property currently owned, leased or
         operated by TCT and,  to its  knowledge,  there are no above  ground or
         underground storage tanks, friable asbestos,  polychlorinated biphenyls
         or urea formaldehyde  foam insulation on any property  currently owned,
         leased or operated by TCT; and

                  (h) has no knowledge of any past or present  Event  related to
         TCT's properties,  operations or business, which Event, individually or
         in the  aggregate,  could  reasonably be expected to interfere  with or
         prevent  continued   compliance  in  all  material  respects  with  all
         Environmental  Laws applicable to the ownership or operation of the TCT
         Assets to the conduct of the TCT Business  substantially  in the manner
         now conducted, or which, individually or in the aggregate, may form the
         basis of any  material  Claim  for or  arising  out of the  release  or
         threatened release into the environment of any Hazardous Material.

Section  4.19 of the TCT  Disclosure  Schedule  sets forth a true,  correct  and
complete list of all existing Phase I environmental  site assessment reports (an
"Environmental  Report") on each parcel of Real Property  owned or leased by TCT
for which an  Environmental  Report has previously  been prepared for TCT (true,
correct and complete  copies of which have  heretofore  been delivered by TCT to
ATC).

         4.20 Capital Stock. The authorized and outstanding  equity interests of
TCT are as set forth in Section 4.20 of the TCT Disclosure Schedule.  All of the
outstanding TCT Units have been duly  authorized and validly  issued,  are fully
paid and  nonassessable  and are not subject to any preemptive or similar rights
and are  owned of  record  and,  to TCT's  knowledge,  beneficially  as shown in
Section 4.20 of the TCT Disclosure  Schedule.  No certificates  have been issued
evidencing  ownership  of TCT Units.  Except as set forth in Section 4.20 of the
TCT Disclosure  Schedule,  TCT has not granted or issued,  nor has TCT agreed to
grant or issue, any TCT Units, other equity interests, or any Option Security or
Convertible Security,  and TCT is not a party to or bound by any agreement,  put
or commitment pursuant to which it is obligated to purchase, redeem or otherwise
acquire  any equity  interests  in TCT or any  Option  Security  or  Convertible
Security.

         4.21 Year 2000  Compliant.  TCT has  reviewed  the areas  within  their
business and  operations  which TCT believes  could be materially  and adversely
affected  by  the  "Year  2000  Problem"   (that  is,  the  risk  that  computer
applications  used  by TCT may be  unable  to  recognize  and  perform  properly
date-sensitive

                                      -16-
<PAGE>

functions involving certain dates prior to and any date on or after December 31,
1999). Based on such reviews, TCT believes that the "Year 2000 Problem" will not
have a material  adverse  effect on TCT.  Except as set forth in Section 4.21 of
the TCT Disclosure  Schedule,  to TCT's knowledge,  each hardware,  software and
firmware product  (collectively  "Software") used by TCT in its business is Year
2000  compliant,  except  for such  noncompliance  that  does not and  could not
reasonably be expected to have a material adverse effect on TCT.

         4.22 Materiality.  The representations and warranties set forth in this
Article are true and  correct as of the date of the  Original  Merger  Agreement
without the materiality exceptions or qualifications  contained therein,  except
to the extent that the failure of such  representations  and warranties to be so
true and correct,  individually  or in the aggregate,  would not have a material
adverse effect on TCT.


                                    ARTICLE 5

                 REPRESENTATIONS AND WARRANTIES OF ATC AND ATMC

         Each of ATC and ATMC,  jointly and  severally,  hereby  represents  and
warrants to TCT and the TCT Members as follows:

         5.1  Organization  and  Business;   Power  and  Authority;   Effect  of
Transaction.

         (a)  Each of ATC and  ATMC is a  corporation  duly  organized,  validly
existing  and  in  good  standing  under  the  laws  of  its   jurisdiction   of
organization, has all requisite power and authority (corporate and other) to own
or hold under lease its  properties and to conduct its business as now conducted
and is duly  qualified  and in good  standing as a foreign  corporation  in each
other  jurisdiction in which the character of the property owned or leased by it
or the nature of its business or operations requires such qualification,  except
for such  qualifications the failure of which to obtain,  individually or in the
aggregate, would not have a material adverse effect on ATC.

         (b)  Each of ATC  and  ATMC  has  all  requisite  power  and  authority
(corporate  and other)  necessary  to enable it to execute and  deliver,  and to
perform its  obligations  under,  this  Agreement and each  Collateral  Document
executed or  required  to be  executed  by it pursuant  hereto or thereto and to
consummate the Transactions;  and the execution, delivery and performance by ATC
and ATMC of this Agreement and each Collateral  Document executed or required to
be executed by it pursuant  hereto or thereto have been duly  authorized  by all
requisite  corporate or other action on the part of ATC and ATMC. This Agreement
has been duly executed and delivered by ATC and ATMC and  constitutes,  and each
Collateral Document executed or required to be executed by each of them pursuant
hereto or thereto or to consummate the Transactions  when executed and delivered
by ATC and ATMC will constitute, legal, valid and binding obligations of each of
ATC and ATMC,  enforceable in accordance with their respective terms,  except as
such  enforceability  may be limited by bankruptcy,  moratorium,  insolvency and
similar Laws  affecting the rights and remedies of creditors and  obligations of
debtors generally and by general principles of equity.

         (c) Except to the extent necessary under its credit facilities, neither
the execution and delivery by ATC and ATMC of this  Agreement or any  Collateral
Document  executed or required to be executed by each of them pursuant hereto or
thereto,  nor the  consummation  of the  Transactions,  nor compliance  with the
terms, conditions and provisions hereof or thereof by ATC and ATMC:

                                      -17-
<PAGE>
                  (i) will conflict with, or result in a breach or violation of,
         or constitute a default under,  any Organic  Document of ATC or ATMC or
         any  Applicable  Law, or will  conflict  with, or result in a breach or
         violation of, or constitute a default under, or permit the acceleration
         of any obligation or liability in, or but for any requirement of giving
         of notice or passage of time or both would  constitute  such a conflict
         with,  breach or  violation  of, or default  under,  or permit any such
         acceleration in, any Material Obligation of ATC or ATMC; or

                  (ii)  will   require  ATC  or  ATMC  to  make  or  obtain  any
         Governmental    Authorization,    Governmental    Filing   or   Private
         Authorization,  except (A)  filings  contemplated  by the  Registration
         Rights Agreement,  (B) filings under the Hart-Scott-Rodino Act, (C) for
         FCC approvals, (D) the filing with the Commission of such reports under
         Section  13(a) or  15(d)  of the  Exchange  Act as may be  required  in
         connection  with  this  Agreement  and  the  transactions  contemplated
         hereby,  (E) the filing of the  Certificate of Merger with the Delaware
         Secretary  of  State,  and  appropriate  documents  with  the  relevant
         authorities  of other states in which ATMC is qualified to do business,
         (F) the filing of a Supplemental  Listing Application with the New York
         Stock  Exchange,  and  (G)  such  other  Governmental   Authorizations,
         Governmental  Filings, and Private  Authorizations the failure of which
         to be made or obtained  would not,  individually  or in the  aggregate,
         have a material adverse effect on ATC.

         5.2 ATC SEC  Reports.  ATC has  heretofore  made  available  to TCT its
Annual  Report on Form 10-K for its most  recent  fiscal  year for which  such a
report  has been  filed and its  Quarterly  Reports  on Form 10-Q for all fiscal
quarters  for which such  reports  have been filed  (collectively,  the "ATC SEC
Documents").  As of the  respective  dates  thereof,  the ATC SEC Documents were
prepared in all material  respects in  accordance  with the Exchange Act and did
not  contain  any  untrue  statement  of a  material  fact or omit to state  any
material fact required to be stated  therein or necessary to make the statements
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading.  ATC has timely filed all forms,  reports and documents with the SEC
required to be filed by it pursuant to the  Securities  Act and the Exchange Act
which complied as to form, at the time such form,  document or report was filed,
in all material respects with the applicable  requirements of the Securities Act
and the Exchange Act. The consolidated  financial  statements of ATC included in
the ATC SEC Documents (the "ATC Financial  Statements"),  including in each case
the notes  thereto,  have been  prepared in  accordance  with GAAP  applied on a
consistent  basis  throughout the periods covered  thereby,  except as otherwise
noted therein,  are true,  accurate and complete in all material  respects,  and
fairly present the consolidated financial condition and the consolidated results
of  operations  and cash flow of ATC,  on the bases  therein  stated,  as of the
respective  dates  thereof,  and  for the  respective  periods  covered  thereby
subject,  in the case of unaudited financial  statements,  to normal nonmaterial
year-end audit adjustments and accruals. As of the respective dates thereof, all
forms,  reports and  documents  to be filed by ATC with the SEC  pursuant to the
Securities  Act and the  Exchange  Act between the date of the  Original  Merger
Agreement  and the Closing  Date will comply as to form,  at the time such form,
document  or report is  filed,  in all  material  respects  with the  applicable
requirements of the Securities Act and the Exchange Act and will not contain any
untrue  statement of a material fact or omit to state any material fact required
to be stated  therein or necessary to make the statements  therein,  in light of
the circumstances under which they were made, not misleading.

         5.3 Material Statements and Omissions;  Absence of Events.  Neither any
representation  or warranty made by ATC or ATMC  contained in this  Agreement or
any certificate,  document or other  instrument  furnished or to be furnished by
ATC or ATMC pursuant to the provisions hereof nor the ATC SEC Documents contains
or will contain any untrue statement of a material fact or omits or will omit to
state any  material  fact  required to make any  statement  contained  herein or
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading. Since the date of the most recent financial statements

                                      -18-
<PAGE>

constituting  a part of the  ATC  Financial  Statements,  except  to the  extent
specifically  described in the ATC SEC Documents,  there has been no change with
respect to ATC or any of its Subsidiaries that has had a material adverse effect
on ATC.  There is no Event  known to ATC which has had or (so far as ATC can now
reasonably  foresee) is likely to have a material  adverse effect on ATC, except
to the extent specifically described in the ATC SEC Documents.  ATC is not aware
of  any   impending  or   contemplated   Event  that  would  cause  any  of  the
representations  and  warranties  made by it in  this  Article  not to be  true,
correct and complete on the date of such Event as if made on that date.

         5.4  Broker or  Finder.  No Person  assisted  in or  brought  about the
negotiation  of this  Agreement or the  Transactions  in the capacity of broker,
agent or finder or in any similar capacity on behalf of ATC or ATMC.

         5.5 Capital Stock. The authorized and outstanding capital stock of ATC,
as of the date set forth  therein,  is as set forth in the most  recent  ATC SEC
Documents.  All of such outstanding  capital stock has been, and, when issued in
accordance with the terms of this  Agreement,  the ATC Common Stock to be issued
upon  consummation  of the Merger will be, duly  authorized and validly  issued,
fully  paid and  nonassessable  and not  subject  to any  preemptive  or similar
rights, and free and clear of all Liens attributable to any action or failure to
act of ATC or any of the Subsidiaries. Since the date as of which information is
set forth in the most  recent  ATC SEC  Documents,  ATC has not  issued  (a) any
shares of common stock of any class, except (i) upon conversion of shares of one
class into shares of another class, (ii) upon exercise of options referred to in
the most recent ATC Financial Statements,  (iii) pursuant to the consummation of
acquisitions  referred  to in the ATC SEC  Documents,  or (iv)  pursuant  to the
consummation of an acquisition as part of which an aggregate of 1,430,879 shares
of ATC Common Stock were issued,  or (b) any  Convertible  Securities  or Option
Securities,  except for the issue of stock  options  under its 1997 Stock Option
Plan, as amended and restated. Except as disclosed in the ATC SEC Documents, all
outstanding shares of capital stock of the Significant  Subsidiaries (as defined
for purposes of Regulations  S-X under the Exchange Act) of ATC are owned by ATC
(in the case of ATMC and certain of such other  Significant  Subsidiaries)  or a
direct or indirect wholly-owned Subsidiary of ATC.

         5.6 Compliance with Governmental Authorizations and Applicable Law.

         (a) ATC and its Subsidiaries  have conducted their respective  business
and owned and operated their  respective  property and assets in accordance with
all Applicable Laws (including  without  limitation all Environmental  Laws) and
Governmental Authorizations,  except for such breaches,  violations and defaults
as, individually or in the aggregate, have not had and are not reasonably likely
to  have  a  material  adverse  effect  on  ATC.  Neither  ATC  nor  any  of its
Subsidiaries,  as of the date of the Original Merger  Agreement,  was in, or was
charged by any Authority with, or, to ATC's  knowledge,  was threatened or under
investigation  by any Authority  with respect to, any breach or violation of, or
default in the  performance,  observance or  fulfillment  of, any Applicable Law
(including without limitation any Environmental  Laws) relating to the ownership
and  operation  of their  respective  assets or the conduct of their  respective
businesses  which,  individually  or in the  aggregate,  has had or will  have a
material adverse effect on ATC. No Event existed or had occurred, as of the date
of the Original Merger Agreement, which constitutes,  or but for any requirement
of giving of notice or passage of time or both would constitute,  such a breach,
violation or default, under any Governmental Authorization or any Applicable Law
(including without limitation any Environmental  Law), except for such breaches,
violations or defaults as,  individually  or in the aggregate,  have not had and
will not have a material adverse effect on ATC.

         (b) There were,  as of the date of the Original  Merger  Agreement,  no
Legal  Actions of any kind pending or, to the  knowledge of ATC,  threatened  at
law, in equity or before any Authority against ATC or

                                      -19-
<PAGE>
any of its  Subsidiaries or the officers or directors of any thereof relating to
the  ownership or operation of their  respective  assets or the conduct of their
respective  businesses which, if determined adversely to ATC, individually or in
the  aggregate,  will  have a  material  adverse  effect  on ATC or which  could
materially  and  adversely  affect the  ability  of ATC or ATMC to  perform  its
obligations  under  this  Agreement,  nor are  there  any  judgments  or  orders
outstanding against ATC or ATMC that could have such effect.

         5.7 Materiality.  The  representations and warranties set forth in this
Article are true and  correct as of the date of the  Original  Merger  Agreement
without the materiality exceptions or qualifications  contained therein,  except
to the extent that the failure of such  representations  and warranties to be so
true and correct,  individually  or in the aggregate,  would not have a material
adverse effect on ATC.


                                    ARTICLE 6

                                    COVENANTS

         6.1      Access to Information; Confidentiality.

         (a) Each party  shall  afford to the other  party and its  accountants,
counsel,  financial advisors and other  representatives (the  "Representatives")
full access  during normal  business  hours  throughout  the period prior to the
Closing Date to all of its (and its Subsidiaries') properties, books, contracts,
insurance  policies,  studies and  reports,  environmental  studies and reports,
commitments and records  (including  without limitation Tax Returns) and, during
such period,  shall  furnish  promptly  upon written  request (i) a copy of each
report,  schedule and other  document filed or received by any party pursuant to
the  requirements  of any  Applicable  Law or filed by it with any  Authority in
connection with the Merger or any other report,  schedule or documents which may
have a material effect on the  businesses,  operations,  properties,  prospects,
personnel,  condition  (financial  or other),  or results of operations of their
respective  businesses,  (ii) to the extent not  provided  for  pursuant  to the
immediately  preceding  clause,  in the  case of  TCT,  all  financial  records,
ledgers,  work papers and other  sources of financial  information  possessed or
controlled  by it or its  accountants  deemed  by  ATC  or  its  Representatives
necessary or useful for the purpose of  performing  an audit of the business and
assets of TCT, and (iii) such other information  concerning any of the foregoing
as ATC or TCT shall reasonably request. All Confidential  Information  furnished
pursuant to the provisions of this Agreement,  including without limitation this
Section,  will be kept  confidential  and shall not,  without the prior  written
consent of the party disclosing such Confidential  Information,  be disclosed by
the other party in any manner  whatsoever,  in whole or in part,  and, except as
required by Applicable Law (including  without limitation in connection with any
registration,  proxy or information statement or similar document filed pursuant
to any  federal or state  securities  Law)  shall not be used for any  purposes,
other than in connection with the Merger.  Except as otherwise  herein provided,
each party agrees to reveal such  Confidential  Information only to those of its
Representatives  or other Persons who it believes need to know such Confidential
Information  for the purpose of  evaluating  and  consummating  the Merger.  For
purposes of this Agreement,  "Confidential  Information"  shall mean any and all
information  (excluding  information  that  (i) has been or is  obtained  from a
source  independent  of the  disclosing  party that,  to the  receiving  party's
knowledge, is not subject to any confidentiality restriction, (ii) is or becomes
generally  available  to the  public  other  than as a  result  of  unauthorized
disclosure by the receiving  party, or (iii) is  independently  developed by the
receiving  party  without  reliance  in any way on  information  provided by the
disclosing  party or a third party  independent of the disclosing party that, to
the  receiving  party's  knowledge,   is  not  subject  to  any  confidentiality
restriction)  related  to the  business  or  businesses  of ATC,  ATMC and their
respective  Affiliates  or TCT  and  its  Affiliates,  including  any  of  their
respective successors and assigns.

                                      -20-
<PAGE>
         (b)  Notwithstanding  the provisions of Section 6.1(a),  (i) each party
may disclose such information as it may reasonably  determine to be necessary in
connection with seeking all Governmental and Private  Authorizations  or that is
required by Applicable Law to be disclosed,  including without limitation in any
registration,  proxy or information  statement or other document  required to be
filed  under any federal or state  securities  Law,  and (ii) ATC may,  with the
prior written consent of TCT, which consent shall not be unreasonably  withheld,
delayed or conditioned, disclose the subject matter of this Agreement to Persons
with whom TCT has a business or  contractual  relationship  in  connection  with
ATC's due diligence  investigation  of TCT. In the event that this  Agreement is
terminated in accordance with its terms, each party shall promptly redeliver all
written Confidential  Information provided pursuant to this Section or any other
provision of this Agreement or otherwise in connection with the Merger and shall
not retain any copies,  extracts or other  reproductions  in whole or in part of
such written  material,  other than one copy thereof which shall be delivered to
independent  counsel for such party which  shall be bound by the  provisions  of
Section 6.1(a).

         (c)  Anything in this  Section or  elsewhere  in this  Agreement to the
contrary  notwithstanding,  either  party may disclose  information  received or
retained by it in accordance  with the  provisions  of this  Agreement if it can
demonstrate  (i) such  information  is  generally  available  to or known by the
public from a source other than the party seeking to disclose  such  information
or (ii) was obtained by the party  seeking to disclose such  information  from a
source other than the other party,  provided that such source was not bound by a
duty of confidentiality to the other party or another party with respect to such
information.

         (d) No investigation pursuant to this Section or otherwise shall affect
any  representation  or warranty in this Agreement of any party or any condition
to the obligations of the parties hereto.

         (e) The provisions of this Section shall apply to all  Subsidiaries  of
ATC and TCT.

         6.2      Agreement to Cooperate; Certain Other Covenants.

         (a) Each of the parties  hereto shall use reasonable  business  efforts
(x) to take,  or cause to be taken,  all actions and to do, or cause to be done,
all things necessary, proper or advisable under Applicable Law to consummate the
Merger and the other  Transactions,  and (y) to refrain from taking, or cause to
be taken,  any action and to refrain from doing or causing to be done,  anything
which could impede or impair the  consummation of the Merger or the consummation
of the other Transactions, including, in all cases, without limitation using its
reasonable  business  efforts  (i) to  prepare  and  file  with  the  applicable
Authorities as promptly as practicable after the execution of this Agreement all
requisite   applications   and   amendments   thereto,   together  with  related
information,  data  and  exhibits,  necessary  to  request  issuance  of  orders
approving  the  Merger by all such  applicable  Authorities,  (ii) to obtain all
necessary or appropriate  waivers,  consents and approvals,  (iii) to effect all
necessary  registrations,  filings and submissions (including without limitation
filings  within  fifteen (15) business  days of the date of the Original  Merger
Agreement under the  Hart-Scott-Rodino Act and all filings necessary for ATMC to
own  and  operate  the  TCT  Assets  and the  TCT  Business),  (iv) to lift  any
injunction  or other legal bar to the Merger (and, in such case, to proceed with
the Merger as expeditiously as possible),  and (v) to obtain the satisfaction of
the  conditions  specified in Article 8, and (vi) to advise the other of, in the
case of TCT, any changes that would be required in the TCT  Disclosure  Schedule
if the applicable  representations and warranties set forth in Article 4 did not
refer to the date of the Original  Merger  Agreement and, in the case of ATC, of
the information  with respect to its authorized and issued capital stock,  other
than as a consequence of matters  heretofore  disclosed by ATC to TCT, including
without limitation those set forth in the ATC SEC Documents.

                                      -21-
<PAGE>

         (b) The parties shall  cooperate with one another in the preparation of
all Tax Returns,  questionnaires,  applications or other documents (i) regarding
any Taxes or  transfer,  recording,  registration  or other  fees  which  become
payable in connection with the Merger that are required to be filed on or before
the Closing  Date;  and (ii) to allocate  under Section 1060 of the Code all the
consideration  under this Agreement  provided by ATC and ATMC in conformity with
the past  practice  of ATC and ATMC and with a  third-party  appraisal  of fixed
assets to be obtained by ATMC at its sole expense.

         (c) TCT shall  cooperate  and use its  reasonable  business  efforts to
cause its independent  accountants to reasonably  cooperate with ATC in order to
enable  ATC,  at its sole  and  absolute  discretion  and  expense,  to have its
independent  accountants prepare audited financial  statements for TCT described
in Section 7.2(g).  TCT will use its reasonable  business efforts to ensure that
such  financial  statements  will have been  prepared  in  accordance  with GAAP
applied on a basis consistent with the TCT Financial Statements and will present
fairly  the  financial  condition,  results of  operation  and cash flow of TCT.
Without  limiting the generality of the  foregoing,  TCT agrees that it will (i)
consent to the use of such audited  financial  statements  in any  registration,
proxy or  information  statement  or other  document  filed by ATC or any of its
Affiliates  under the  Securities  Act or the  Exchange Act and (ii) execute and
deliver,  and cause its officers to execute and deliver,  such  "representation"
letters as are  customarily  delivered  in  connection  with audits and as ATC's
independent accountants may reasonably request under the circumstances.

         ATC shall,  if permitted by the SEC,  register under the Securities Act
the shares of ATC Common  Stock  issuable  pursuant to the  consummation  of the
Merger.  If such  registration is effective,  the form of TCT Investment  Letter
shall be  appropriately  revised and the Persons  from whom it is required to be
delivered shall be limited to those Persons who may be deemed to be "affiliates"
of TCT,  within the meaning of the applicable  rules and  regulations of the SEC
under the Securities Act.

         6.3 Public Announcements.  Until the Closing or the termination of this
Agreement,  each party shall  consult  with the other  before  issuing any press
release or otherwise making any public statements with respect to this Agreement
or the Merger and shall not issue any such press release or make any such public
statement without the prior written approval of the other.  Notwithstanding  the
foregoing, the parties acknowledge and agree that they may, without each other's
prior consent,  issue such press releases or make such public  statements as may
be required  by  Applicable  Law, in which case the issuing  party shall use all
reasonable  efforts to consult  with the other  party and agree upon the nature,
content and form of such press release or public statement.

         6.4  Notification  of Certain  Matters.  Each party  shall give  prompt
notice  to the  other of the  occurrence  or  non-occurrence  of any  Event  the
occurrence or  non-occurrence  of which would be reasonably  likely to cause (a)
any  representation  or warranty  made by it contained  in this  Agreement to be
untrue or inaccurate in any material  respect or (b) any failure by it to comply
with or satisfy,  or be able to comply with or satisfy, in any material respect,
any  covenant,  condition or  agreement  to be complied  with or satisfied by it
under this Agreement in any material  respect,  such that, in any such case, one
or more of the conditions of Closing would not be satisfied;  provided, however,
that the  delivery  of any notice  pursuant to this  Section  shall not limit or
otherwise  affect the  rights  and  remedies  available  hereunder  to the party
receiving such notice or the obligations of the party delivering such notice and
shall not, in any event, affect the representations,  warranties,  covenants and
agreements  of the parties or the  conditions  to their  respective  obligations
under this Agreement.

                                      -22-
<PAGE>

         6.5  No  Solicitation.   Unless  and  until  this  Agreement  has  been
terminated,  TCT shall not, and shall not permit any TCT Member to, nor shall it
or any of  them  knowingly  permit  any of its or any of  their  Representatives
(including,  without  limitation,  any  investment  banker,  financial  adviser,
broker, finder,  attorney,  accountant or other agent or representative retained
by it or any of them) to, initiate,  solicit, encourage or facilitate, or any of
their  Representatives  (including,  without limitation,  any investment banker,
broker,  finder,  attorney  or  accountant  retained  by it or any of them)  to,
initiate,  solicit or facilitate,  directly or indirectly,  any inquiries or the
making of any proposal with respect to any  Alternative  Transaction,  engage in
any discussions or negotiations  concerning,  or provide to any other Person any
information or data relating to, it for the purposes of, or otherwise  cooperate
in any way with or assist or participate  in, or facilitate any inquiries or the
making of any proposal which constitutes,  or may reasonably be expected to lead
to, a proposal  to seek or effect any  Alternative  Transaction,  or agree to or
endorse any  Alternative  Transaction.  If TCT,  any TCT Member or its or any of
their  Representatives  receives  any  inquiry  with  respect to an  Alternative
Transaction  while this  Agreement  is in effect,  TCT or such TCT Member  shall
inform the inquiring party that it is not entitled to enter into  discussions or
negotiations  relating to an  Alternative  Transaction.  The  provisions of this
Section shall apply to all Subsidiaries of TCT.

         6.6 Conduct of Business by TCT Pending the Merger.  Except as set forth
in Section 6.6 of the TCT Disclosure  Schedule or as otherwise  contemplated  by
this Agreement, after the date of the Original Merger Agreement and prior to the
Closing  Date  or  earlier  termination  of this  Agreement,  unless  ATC  shall
otherwise  consent  in  writing,   TCT  shall,  and  shall  cause  each  of  its
Subsidiaries to:

                  (a) conduct its  business in the  ordinary and usual course of
         business and consistent with past practice;

                  (b) not (i) amend or propose to amend its  Organic  Documents,
         (ii)  split,  combine  or  reclassify  (whether  by stock  dividend  or
         otherwise)  its  outstanding  capital  stock or issue or authorize  the
         issuance  of any  other  securities  in  respect  of, in lieu of, or in
         substitution  for shares of its capital stock,  or (iii) other than any
         Distribution  resulting from the spin-off of Prime, declare, set aside,
         pay or make any  Distribution,  whether  in cash,  stock,  property  or
         otherwise;

                  (c) not issue,  sell, pledge or dispose of, or agree to issue,
         sell,  pledge or dispose of, any TCT Units,  other equity  interests in
         TCT, Convertible Securities or Option Securities;

                  (d) not (i) incur or become  contingently  liable with respect
         to any Indebtedness for Money Borrowed,  other than (x) borrowings,  in
         addition to those  permitted or consented to pursuant to the provisions
         of clause (y) immediately  following,  not to exceed the sum of (I) the
         principal  amount of  borrowings  presently  outstanding  and (II) $3.0
         million  in  the  aggregate  outstanding  at  any  one  time,  and  (y)
         borrowings necessary to finance acquisitions and construction  projects
         permitted  or consented  pursuant to the  provisions  of paragraph  (e)
         below,  (ii)  redeem,  purchase,  acquire  or offer or agree to redeem,
         purchase  or acquire  any of its equity  interests,  including  without
         limitation  any  TCT  Units,   other  equity   interests,   Convertible
         Securities or Option Securities,  (iii) sell, lease,  license,  pledge,
         dispose of or encumber any  properties or assets or sell any businesses
         other than (x)  dispositions  in the ordinary  course of business,  (y)
         Liens arising in accordance  with the  provisions of  Indebtedness  for
         Money Borrowed in effect on the date of the Original  Merger  Agreement
         and in accordance  with their present  terms,  and (z) leases of towers
         and shelter space to  third-party  customers in the ordinary  course of
         business and in accordance  with past  practices and policies,  or (iv)
         make any loans,  advances or capital  contributions  to, or investments
         in, any other  Person,  except to  officers  and  employees  of TCT for
         travel,  business  or  relocation  expenses in the  ordinary  course of
         business;
                                      -23-
<PAGE>

                  (e) not  enter  into or  agree to  enter  into any  Restricted
         Transaction (or group of related Restricted Transactions),  whether for
         its own account or for any other Person,  if (i) the  aggregate  amount
         reasonably expected to be expended by TCT or any of its Subsidiaries in
         connection with such individual  Restricted  Transaction (together with
         any group of related Restricted  Transactions) exceeds $3.0 million, or
         (ii)  the  aggregate  amount  to be  expended  in  connection  with all
         Restricted  Transactions (together with any group of related Restricted
         Transactions)  exceeds  $10.0  million;  provided,  however,  that  the
         foregoing  restriction  shall not apply to any  Restricted  Transaction
         pursuant to agreements which are described in Section 6.6(e) of the TCT
         Disclosure Schedule;

                  (f) use  reasonable  business  efforts to preserve  intact its
         business organization and goodwill,  keep available the services of its
         present  officers  and key  employees,  and  preserve  the goodwill and
         business  relationships  with  customers  and  others  having  business
         relationships  with them and not  engage  in any  action,  directly  or
         indirectly,  with the  intent  to  adversely  impact  the  transactions
         contemplated by this Agreement;

                  (g) confer on a regular  and  frequent  basis with one or more
         representatives of ATC to report material  operational  matters and the
         general status of ongoing operations;

                  (h) not adopt,  enter into, amend or terminate any employment,
         severance,  special pay  arrangement  with  respect to  termination  of
         employment  or  other  similar  arrangements  or  agreements  with  any
         directors, officers or key employees without the prior approval of ATC;

                  (i) maintain with financially  responsible insurance companies
         insurance  on the TCT Assets and the TCT  Business in such  amounts and
         against such risks and losses as are consistent with past practice;

                  (j) not make any Tax election that could  reasonably be likely
         to have a material  adverse  effect on TCT or settle or compromise  any
         material Tax liability;

                  (k) except in the  ordinary  course of  business  or except as
         would not,  individually or in the aggregate,  have a material  adverse
         effect on TCT, not modify, amend or terminate any Material Agreement to
         which TCT is a party or by which any of the TCT  Assets may be bound or
         to which any of them may be  subject  or waive,  release  or assign any
         material rights or claims thereunder;

                  (l) not make any material  change to its  accounting  methods,
         principles or practices, except as may be required by GAAP;

                  (m) not enter into any Lease or other  agreement  with respect
         to any antennae site on any of its towers,  whether  presently owned or
         hereafter acquired by TCT other than in the ordinary course of business
         and in accordance with past practices and policies;

                  (n) except as set forth in Section 4.14 of the TCT  Disclosure
         Schedules, (i) not grant to any executive officer or other key employee
         of TCT any increase in compensation, except for normal increases in the
         ordinary  course  of  business  consistent  with  past  practice  or as
         required  under Benefit  Arrangements  set forth in Section 4.14 of the
         TCT Disclosure  Schedule,  (ii) not grant to any such executive officer
         any increase in severance or  termination  pay,  except as was required
         under any  Benefit  Arrangements  set forth in Section  4.14 of the TCT
         Disclosure Schedule,  (iii) not adopt or, except in the ordinary course
         of business, amend any Plan or Benefit Arrangement (including

                                      -24-
<PAGE>
         change any  actuarial or other  assumption  used to  calculate  funding
         obligations  with  respect  to any Plan,  or change the manner in which
         contributions  to  any  Plan  are  made  or the  basis  on  which  such
         contributions  are determined) and (iv) except in the ordinary  course,
         not  enter  into,  amend  in any  material  respect  or  terminate  any
         Governmental Authorization,  material Private Authorization or material
         Contract;

                  (o) not  voluntarily  take or permit  to be taken  any  action
         which if taken  between the end of its most recent  fiscal  quarter and
         prior to the date of the  Original  Merger  Agreement  would  have been
         required  to be  noted  as an  exception  on  Section  4.16  of the TCT
         Disclosure Schedule, other than pursuant to the conduct of its business
         in the ordinary and usual course of business and  consistent  with past
         practice; and

                  (p) not  authorize  or enter  into any  agreement  that  would
         violate any of the foregoing.

In the  event  that TCT or any of its  Subsidiaries  desires  to take any of the
actions  prohibited by the  provisions  of this  Section,  TCT shall give prompt
written notice to ATC, referring to the provisions of this Section. In the event
that ATC does not object to the taking of such action  within ten (10)  business
days of receipt of such notice and all  material  information  requested  by ATC
with respect  thereto,  TCT or such Subsidiary shall have the right to take such
action.

         6.7  Preliminary  Title Reports.  As promptly as practicable  after the
execution  of  this  Agreement,  ATC  may  obtain  at  its  expense  a  standard
preliminary  title report (the "Title Report") dated on or after the date of the
Original Merger  Agreement  issued by such title company or companies as TCT and
ATC shall mutually reasonably agree with respect to each parcel of Real Property
owned or leased by TCT or any of its Subsidiaries.

         6.8 Environmental  Site  Assessments.  As promptly as practicable after
the execution of this Agreement, ATC may at its own cost and expense obtain, and
deliver  to TCT full and  complete  copies of, an  Environmental  Report on each
parcel of Real Property  owned or leased by TCT or any of its  Subsidiaries  for
which an  Environmental  Report has not heretofore  been delivered by TCT to ATC
(or as to which ATC has  heretofore  indicated  that the existing  Environmental
Report  raises  questions  of  potential  liability  which  has had or  could be
reasonably  expected to have a material adverse effect on TCT). Site assessments
shall be conducted by such  consultants and  professionals  as ATC and TCT shall
mutually  reasonably agree and shall be arranged at times mutually convenient to
the  parties.  Each of TCT and ATC  shall be  entitled  to have  representatives
present at the time such site  assessments  are  conducted and to have copies of
all correspondence with the company preparing such Environmental Reports.

         6.9 Solicitation of Employees. If this Agreement is terminated, each of
ATC and TCT agrees that neither it nor any of its Affiliates  will, for a period
of twelve  (12) months  from the date of such  termination,  solicit or actively
seek to hire any  individual who during such period is employed by ATC or any of
its Affiliates or TCT or any of its  Affiliates,  as the case may be, whether or
not  such  individual  would  commit  breach  of  such  individual's  employment
agreement or contract in leaving such employment;  provided,  however,  that the
foregoing shall not prevent ATC or TCT (or any of their  respective  Affiliates)
from  soliciting  or  actively  seeking  to hire any such key  employee  who (i)
initiates employment discussions with it, (ii) is not employed by ATC or TCT, as
the case may be, on the date TCT or ATC (or any of their respective Affiliates),
as the case  may be,  first  solicits  such key  employee,  or (iii)  soliciting
through general advertisement, including without limitation on the Internet.

                                      -25-
<PAGE>
         6.10 Certificate of Non-Foreign Status.  Prior to the Closing Date, TCT
shall use its reasonable  business efforts to obtain on behalf of itself and ATC
(in  connection  with  potential  deduction and  withholding  obligations  under
Sections  1445 or 1446 of the  Code),  from  each TCT  Member a  certificate  of
non-foreign  status of such member that meets the  requirements  of both Section
1.1445-2(b)  of the  Regulations  and Section 5.04 of Revenue  Procedure  89-31,
1989-1  C.B.  895,  it being  understood  that the  failure  to obtain  any such
certificates  shall  not be deemed  to be a breach  of this  Section.  TCT shall
furnish to ATC on the Closing Date a copy of such  certificates  of  non-foreign
status.

         6.11 Tax Returns and Other  Reports.  TCT's former tax matters  partner
(within the meaning of Section  6231 of the Code) will  prepare and file all Tax
Returns and other reports,  filings,  and amendments required to be filed by TCT
or delivered to the TCT members after the Effective Time, but only to the extent
that such Tax Returns and other documents relate to taxable periods (or portions
thereof) ending at or prior to the Effective Time; provided however that ATC and
ATMC shall be  provided  the  opportunity  to review and  comment  upon such Tax
Returns, reports, filings, and amendments prior to their filing or delivery. The
parties hereto agree that the Merger is being effected as a convenient mechanism
for the TCT Members to sell their TCT Units to ATI, and  accordingly the parties
will  (irrespective  of the  subsequent  liquidation  or merger of TCT into ATI)
treat the Merger for income Tax  purposes  as a sale by the TCT Members of their
TCT Units to ATI.

         6.12  Section 754  Elections.  At the request of ATC, TCT and ATC shall
use  reasonable  business  efforts to cooperate to cause each  Subsidiary of TCT
that is identified by ATC to implement an election under Section 754 of the Code
and under comparable provisions of all state and local income Tax Laws.


                                    ARTICLE 7

                               CLOSING CONDITIONS

         7.1 Conditions to Obligations of Each Party. The respective obligations
of each party to consummate the Merger shall, except as hereinafter  provided in
this Section,  be subject to the satisfaction at or prior to the Closing Date of
the  following  conditions,  any or all of which may be  waived,  in whole or in
part, to the extent permitted by Applicable Law:

                  (a) As of the Closing  Date,  no Legal Action shall be pending
         before any  Authority  seeking to enjoin,  restrain,  prohibit  or make
         illegal or to impose any  materially  adverse  conditions in connection
         with, the  consummation of the Merger,  it being  understood and agreed
         that a written request by any Authority for information with respect to
         the Merger,  which  information  could be used in connection  with such
         Legal  Action,  shall not in  itself  be  deemed  to be a Legal  Action
         pending before any such Authority;

                  (b) Any waiting period (and any extension thereof)  applicable
         to the consummation of the Merger under the Hart-Scott-Rodino Act shall
         have  expired  or been  terminated  without  any  condition  that has a
         material  adverse  effect on TCT or any of its Members or any Affiliate
         thereof;

                  (c) Except with respect to the Hart-Scott-Rodino Act (which is
         addressed in Section 7.1(b)),  all authorizations,  consents,  waivers,
         orders or approvals  required to be obtained from all Authorities,  and
         all  filings  (other  than the  Certificate  of  Merger),  submissions,
         registrations,  notices or  declarations  required to be made by any of
         the  parties  with  any  Authority,  prior to the  consummation  of the
         Merger,  shall  have  been  obtained  from,  and  made  with,  all such
         Authorities,

                                      -26-
<PAGE>
         except for such authorizations,  consents,  waivers, orders, approvals,
         filings,  registrations,  notices or declarations the failure to obtain
         or make would not have a material adverse effect on TCT; and

                  (d) The ATC  Common  Stock to be issued as part of the  Merger
         Consideration  shall have been listed for trading on The New York Stock
         Exchange, subject to official notice of issuance.

         7.2 Conditions to Obligations of ATC and ATMC. The obligation of ATC to
cause ATMC to,  and of ATMC to,  consummate  the Merger  shall be subject to the
satisfaction of the following conditions,  any or all of which may be waived, in
whole or in part, by ATC and ATMC to the extent permitted by Applicable Law:

                  (a) All agreements, certificates, opinions and other documents
         required to be delivered  pursuant to the  provisions of this Agreement
         shall be reasonably  satisfactory  in form,  scope and substance to ATC
         and its  counsel,  and ATC and its  counsel  shall  have  received  all
         information and copies of all documents, including records of corporate
         proceedings, which they may reasonably request in connection therewith,
         such documents where appropriate to be certified by proper  Authorities
         or corporate officers;

                  (b) TCT shall have  furnished ATC and, at ATC's  request,  any
         bank or other financial  institution  providing credit to ATC, with one
         or more favorable opinions, dated the Closing Date, of counsel for TCT,
         reasonably  satisfactory  to ATC,  covering  the  matters  set forth in
         Exhibit B and made a part  hereof,  and in forms  and scope  reasonably
         satisfactory  to ATC,  and with respect to such other  matters  arising
         after the date of the Original  Merger  Agreement as ATC or its counsel
         may reasonably request;

                  (c) (i) The representations and warranties of TCT contained in
         this  Agreement  (other than in Section 4.20) shall be true and correct
         at and as of the Closing  Date with the same force and effect as though
         made  on  and  as  of  such  date,   except  (x)  to  the  extent  such
         representations  and warranties  expressly  speak as of an earlier date
         (in which case such representations and warranties shall continue to be
         true and  correct as of such  earlier  date) and (y) to the extent that
         the  failure  of such  representations  and  warranties  to be true and
         correct,  individually  or in the aggregate,  would not have a material
         adverse effect on TCT; provided,  however, that for the purpose of this
         clause (y),  representations  and  warranties  that are qualified as to
         materiality (including by reference to "material adverse effect") shall
         not  be  deemed  to be  so  qualified;  (ii)  the  representations  and
         warranties of TCT set forth in Section 4.20 of this Agreement  shall be
         true and correct; provided,  however, such untruth shall be disregarded
         for  purposes  of this  Section  7.2(c)  if, by  adjusting  the  Merger
         Consideration  at Closing,  the untruth is rendered  harmless  and such
         adjustment either does not require the approval of the TCT Members,  or
         such approval has been obtained,  in accordance  with the DLLCA:  (iii)
         each  and  all of the  agreements  and  covenants  to be  performed  or
         satisfied by TCT or any of the TCT  stockholders  hereunder at or prior
         to the Closing Date shall have been duly  performed or satisfied in all
         material  respects;  and (iv) TCT shall  have  furnished  ATC with such
         certificates   and  other  documents   evidencing  the  truth  of  such
         representations,   warranties,   covenants  and   agreements   and  the
         performance  of such  agreements  or  conditions  as ATC or its counsel
         shall have reasonably requested;

                  (d) Other than those which,  individually or in the aggregate,
         the failure of which to obtain would not have a material adverse effect
         on  the  TCT  Assets  or  the  TCT  Business  taken  as  a  whole,  all
         authorizations,  consents, waivers, orders or approvals required by the
         provisions  of this  Agreement to be obtained  from all Persons  (other
         than  Authorities)  prior to the consummation of the Merger,  including
         without  limitation  those required in order for TCT to continue to own
         all of

                                      -27-

<PAGE>
         the TCT Assets and  continue to operate the TCT  Business as  conducted
         immediately prior to the Closing (including without limitation,  at the
         cost  and  expense  of  TCT,  all  modifications,  if any,  of  Private
         Authorizations,  Leases  and  Material  Agreements  of TCT set forth in
         Section  7.2(d)  of  the  TCT  Disclosure  Schedule)  shall  have  been
         obtained, without the imposition,  individually or in the aggregate, of
         any condition or requirement which could have a material adverse effect
         on TCT;

                  (e) Between the date of the Original Merger  Agreement and the
         Closing  Date,  there shall not have  occurred  and be  continuing  any
         material  adverse  change in TCT from that reflected in the most recent
         TCT Financial Statements;

                  (f) The TCT Members and TCT shall have  delivered  or cause to
         be  delivered  to  ATC  all  of  the  Collateral  Documents  and  other
         agreements,  documents and instruments  required to be delivered by the
         TCT  Members or TCT to ATC at or prior to the  Closing  pursuant to the
         terms of this Agreement;

                  (g) ATC shall  have  received  a letter  from its  independent
         accountants to the effect that an  unqualified  report (as to the scope
         of the audit,  access to the books and records and the  cooperation  of
         management) on the financial statements  (consisting of a balance sheet
         for the  fiscal  year  ended  December  31,  1997,  and  statements  of
         operations and cash flow for the period ended December 31, 1997) of TCT
         could be prepared by them in conformity  with GAAP and  Regulation  S-X
         under the Securities Act;

                  (h) As of the Closing  Date,  except as otherwise set forth in
         Section 4.6(a) of the TCT Disclosure Schedule, no Legal Action shall be
         pending  before  any  Authority  which  could,  individually  or in the
         aggregate,  have a material  adverse effect on TCT, it being understood
         and agreed that a written request by any Authority for information with
         respect to the Merger,  which  information  could be used in connection
         with such  Legal  Action,  shall  not be  deemed  to be a Legal  Action
         pending before any such Authority;

                  (i)  The  Environmental   Reports  prepared  pursuant  to  the
         provisions  of  Section  6.8  shall  not  indicate  the  likelihood  of
         potential liability which has had or could reasonably be likely to have
         a material  adverse  effect on TCT,  and no Event or Events  shall have
         occurred  subsequent  to the  date of the  Original  Merger  Agreement,
         which,   individually   or  in   the   aggregate,   would   cause   the
         representations  and  warranties  of TCT  set  forth  in  Section  4.19
         (without  regard to  knowledge)  to be  inaccurate or incomplete in any
         material respect;

                  (j) ATC shall have received,  at its expense,  a commitment to
         issue standard ALTA title insurance  policies  insuring TCT's or any of
         its  Subsidiaries'  leasehold  or fee  interest  in the parcels of land
         representing  at least  95% of TCT net  revenues  on which  each of its
         towers is located and the  improvements  located  thereon and the Title
         Report shall not disclose any  exception,  other than  Permitted  Liens
         (and liens on real property  owned by other Persons as to which TCT has
         a ground lease), and no Event or Events shall have occurred  subsequent
         to the date of the Original Merger Agreement, which, individually or in
         the aggregate,  would cause the  representations  and warranties of TCT
         set forth in Section 4.4 (without regard to knowledge) to be inaccurate
         or incomplete in any material respect;

                  (k) All Convertible  Securities and Option  Securities of TCT,
         if any, outstanding  immediately prior to the Closing shall be canceled
         or  converted to TCT Units and,  from and after the  Closing,  shall no
         longer be of any force or effect;

                                      -28-
<PAGE>

                  (l) ATC shall have  received,  at its  expense,  a report with
         respect  to each of the towers of TCT and any of its  Subsidiaries,  of
         such  structural  engineers as are reasonably  satisfactory  to ATC and
         TCT, that shall indicate that towers  representing  at least 95% of TCT
         net  revenues  (i)  are  structurally   sound  and  in  good  operating
         condition,   (ii)  are  in  compliance   with  all   Applicable   Laws,
         Governmental   Authorizations,   Private  Authorizations  and  issuance
         requirements,  and (iii) do not require  structural  or other  material
         repairs  (other  than  those  set  forth in  Section  7.2(l) of the TCT
         Disclosure  Schedule  heretofore  delivered  to ATC)  costing more than
         $250,000 in the aggregate;  provided,  however,  that to the extent the
         aggregate  amount of such repairs is in excess of  $250,000,  ATC shall
         not be entitled to terminate this Agreement but the Cash  Consideration
         shall be reduced by an amount equal to the excess of (x) the  aggregate
         amount of such repairs over (y) $250,000;

                  (m) Cox shall have  executed and delivered to ATC an agreement
         substantially  in the form attached hereto as Exhibit C and made a part
         hereof,  amended to reflect  the fact that Cox shall be entitled to one
         (1)  demand  registration  on Form S-1  under the  Securities  Act (the
         "Registration Rights Agreement");

                  (n) Each TCT  Member  that owns  Class B TCT Units  shall have
         executed and delivered to ATC an investment letter substantially in the
         form of Exhibit D  attached  hereto  and made a part  hereof  (the "TCT
         Investment Letters");

                  (o) The  Monthly  Revenue  Run Rate of TCT for the month ended
         immediately  prior to the  Closing  Date  shall have been not less than
         $978,815,  increased for the period  between  October 31, 1998 and such
         month end at an annual rate of 15%, compounded annually;

                  (p) Cox and each of the  executive  officers of TCT shall have
         executed and  delivered  to ATC  agreements  substantially  in the form
         attached  hereto as part of Exhibit E and made a part  hereof (the "ATC
         Noncompetition Agreements");

                  (q) All instruments evidencing Indebtedness for Money Borrowed
         of TCT or any of its Subsidiaries shall permit the repayment thereof by
         ATC without premium or penalty;

                  (r) Any employment  agreement or other arrangement between TCT
         and any of Messrs. Madigan,  Sivertsen, D. Smith, R. Smith and Williams
         will be  terminated,  at no cost to ATC or  ATMC,  and any  Contractual
         Obligation  between  TCT  and  any  TCT  Member  or any  member  of the
         Immediate  Family of any TCT  Member,  or any  Affiliate  of any of the
         foregoing, that is to survive the Merger shall, to the extent requested
         by ATC, be  amended,  at no cost to ATC or ATMC,  to contain  terms and
         conditions satisfactory to ATC;

                  (s) Each of the Persons  named therein shall have executed and
         delivered to ATC an agreement substantially in the form attached hereto
         as Exhibit F and made a part hereof (the "Indemnity Escrow  Agreement")
         and ATC shall have been  permitted  to make the  deposits  contemplated
         thereby; and

                  (t) Cox shall  shall  have  executed  and  delivered  to TCT a
         special release  substantially in the form of Exhibit I attached hereto
         and made a part hereof (the "Cox Special Release").

                                      -29-

<PAGE>
         7.3  Conditions  to  Obligations  of  TCT.  The  obligation  of  TCT to
consummate  the Merger  shall be subject to the  satisfaction  of the  following
conditions,  any or all of which may be waived,  in whole or in part,  by TCT to
the extent permitted by Applicable Law:

                  (a) All agreements, certificates, opinions and other documents
         required to be delivered  pursuant to the  provisions of this Agreement
         shall be reasonably  satisfactory  in form,  scope and substance to TCT
         and its  counsel,  and TCT and its  counsel  shall  have  received  all
         information and copies of all documents, including records of corporate
         proceedings, which they may reasonably request in connection therewith,
         such documents where appropriate to be certified by proper  Authorities
         or corporate officers;

                  (b) ATC shall have  furnished  TCT, with  favorable  opinions,
         dated the Closing Date, of Sullivan & Worcester  LLP,  counsel for ATC,
         substantially  in the form attached hereto as Exhibit G and made a part
         hereof,  and with respect to such other matters  arising after the date
         of the Original  Merger  Agreement as TCT or its counsel may reasonably
         request;

                  (c) (i) The  representations  and  warranties  of ATC and ATMC
         contained in this  Agreement  (other than in Section 5.5) shall be true
         and  correct  at and as of the  Closing  Date  with the same  force and
         effect as though made on and as of such date,  except (x) to the extent
         such  representations  and warranties  expressly speak as of an earlier
         date (in which case such  representations  and warranties shall be true
         and  correct as of such  earlier  date) and (y) to the extent  that the
         failure of such  representations and warranties to be true and correct,
         individually  or in the  aggregate,  would not have a material  adverse
         effect on ATC; provided,  however,  that for the purpose of this clause
         (y),   representations   and  warranties   that  are  qualified  as  to
         materiality (including by reference to "material adverse effect") shall
         not  be  deemed  to be  so  qualified;  (ii)  the  representations  and
         warranties of ATC set forth in Section 5.5 of this  Agreement  shall be
         true and correct; provided,  however, such untruth shall be disregarded
         for  purposes  of this  Section  7.3(c)  if, by  adjusting  the  Merger
         Consideration  at Closing,  the untruth is rendered  harmless  and such
         adjustment  either  does not  require  the  approval of the ATC or ATMC
         stockholders,  or such approval has been obtained,  in accordance  with
         the DCL;  (iii)  each and all of the  agreements  and  covenants  to be
         performed  or  satisfied  by ATC or ATMC  hereunder  at or prior to the
         Closing  Date  shall  have  been duly  performed  or  satisfied  in all
         material respects;  and (iv) ATC and ATMC shall have furnished TCT with
         such  certificates  and other  documents  evidencing  the truth of such
         representations,   warranties,   covenants  and   agreements   and  the
         performance  of such  agreements  or  conditions  as TCT or its counsel
         shall have reasonably requested;

                  (d) ATC and ATMC shall have delivered or cause to be delivered
         to TCT all of the Collateral Documents and other agreements,  documents
         and  instruments  required to be delivered by ATC and ATMC to TCT at or
         prior to the Closing pursuant to the terms of this Agreement;

                  (e) Between the date of the Original Merger  Agreement and the
         Closing  Date,  there shall not have  occurred  and be  continuing  any
         material  adverse  change in ATC from that reflected in the most recent
         ATC Financial Statements;

                  (f) As of the Closing  Date,  no Legal Action shall be pending
         before any Authority which could,  individually or in the aggregate, be
         reasonably  expected to have a material adverse effect on ATC, it being
         understood  and  agreed  that a written  request by any  Authority  for
         information with respect to the Merger, which information could be used
         in connection with such Legal Action, shall not be deemed to be a Legal
         Action pending before any such Authority;

                                      -30-
<PAGE>
                  (g) ATC shall have  executed and  delivered  the  Registration
         Rights  Agreement  and  permitted  Cox and such other TCT Members as so
         request, in their sole and absolute  discretion,  to become signatories
         thereto;

                  (h) ATC shall have delivered to Cox an agreement substantially
         in the form of Exhibit H attached  hereto and made a part  hereof  (the
         "ATC Voting Agreement")  executed by the ATC stockholders named therein
         and any individual nominated pursuant thereto shall have been elected a
         director of ATC; and

                  (i) ATC shall have executed and delivered to TCT the Indemnity
         Escrow Agreement.

                                    ARTICLE 8

                        TERMINATION, AMENDMENT AND WAIVER

         8.1 Termination.  This Agreement may be terminated at any time prior to
the Effective Time only pursuant to the following provisions:

                  (a) by mutual consent of TCT and ATC; or

                  (b) by ATC or TCT  if  any  permanent  injunction,  decree  or
         judgment of any Authority  preventing  consummation of the Merger shall
         have become final and nonappealable; or

                  (c) by TCT in the event (i) TCT is not in  material  breach of
         this Agreement and none of its representations or warranties shall have
         become and  continue  to be untrue in any manner  that would  cause the
         condition  set forth in Section  7.2(c) not to be  satisfied,  and (ii)
         either (A) the Merger has not been  consummated on or prior to June 30,
         1999, or (B) ATC or ATMC is in material breach of this Agreement or any
         of its  representations  or  warranties  shall  have been or become and
         continue to be untrue in any manner that would cause the conditions set
         forth in  Section  7.3(c)  not to be  satisfied,  and such a breach  or
         untruth exists and is not capable of being cured by and will prevent or
         delay consummation of the Merger by or beyond June 30, 1999; or

                  (d) by ATC in  the  event  (i)  neither  ATC  nor  ATMC  is in
         material  breach of this Agreement and none of its  representations  or
         warranties  shall have  become and  continue to be untrue in any manner
         that would cause the  condition  set forth in Section  7.3(c) not to be
         satisfied,  and (ii) either (A) the Merger has not been  consummated on
         or prior to June 30,  1999,  or (B) TCT is in  material  breach of this
         Agreement or any of TCT's representations or warranties shall have been
         or become and  continue to be untrue in any manner that would cause the
         conditions set forth in Section 7.2(c) not to be satisfied,  and such a
         breach or untruth  exists and is not capable of being cured by and will
         prevent or delay consummation of the Merger by or beyond June 30, 1999;
         or

                  (e)  by  ATC or TCT in the  event  the  Merger  has  not  been
         consummated on or prior to the Termination Date.

         The term "Termination Date" shall mean September 30, 1999 or such other
date as the parties may, from time to time, mutually agree.

                                      -31-
<PAGE>
         The right of ATC or TCT to terminate  this  Agreement  pursuant to this
Section shall remain  operative  and in full force and effect  regardless of any
investigation made by or on behalf of any party, any Person controlling any such
party or any of their respective  Representatives  whether prior to or after the
execution of this Agreement.

         8.2 Effect of  Termination.  Except as provided  in Sections  6.1 (with
respect to confidentiality),  6.3 and 10.2 and this Section, in the event of the
termination  of this  Agreement  pursuant to Section 8.1, this  Agreement  shall
forthwith  become void, there shall be no liability on the part of any party, or
any of their respective  stockholders,  officers or directors,  to the other and
all rights and  obligations of any party shall cease;  provided,  however,  that
such termination  (including without limitation any termination  pursuant to the
provisions of Section 8.1(e)) shall not relieve any party from liability for any
willful or  intentional  misrepresentation  or breach of any of its  warranties,
covenants or agreements set forth in this Agreement. In the event this Agreement
is terminated by either party  pursuant to Section 8.1 (c) or 8.1(d)  because of
the  intentional  or wilful  breach of covenant or  agreement of the other party
(including  without  limitation the refusal of the other party to consummate the
Merger  notwithstanding  the fact that all of its  conditions to do so have been
satisfied), the terminating party shall be entitled to liquidated damages in the
amount of  $10,000,000,  it being agreed that such amount shall  constitute full
payment for any and all damages suffered by the nondefaulting party by reason of
such intentional or wilful breach of covenant or agreement. ATC and TCT agree in
advance that actual damages would be difficult to ascertain and that $10,000,000
is a fair and equitable  amount to reimburse TCT or ATC, as the case may be, for
damages sustained due to ATC's or TCT's failure to consummate the Merger for the
reasons specified in the immediately  preceding  sentence.  Notwithstanding  the
foregoing,  the liquidated damages provisions set forth herein are not exclusive
remedies  and each  party  shall  have  the  right,  in its  sole  and  absolute
discretion,  to seek  specific  performance  of this  Agreement  pursuant to the
provisions  of  Section  10.4.  Anything  in  this  Agreement  to  the  contrary
notwithstanding, although a party may have multiple reasons for terminating this
Agreement,  it shall not be entitled to collect liquidated or other damages more
than once.

                                    ARTICLE 9

                                 INDEMNIFICATION

         9.1  Survival.  The  representations  and  warranties  of  the  parties
contained in or made pursuant to this Agreement or any Collateral Document shall
survive the Closing and shall remain  operative and in full force and effect for
a period of twelve (12) months after the Closing  Date,  except that in the case
of matters of a nature  referred to in  Sections  4.1,  4.20,  5.1 and 5.5 which
shall survive and remain  operative and in full force and effect for a period of
twenty-four (24) months after the Closing Date,  regardless of any investigation
or statement as to the results thereof made by or on behalf of any party hereto.
The  covenants and  agreements  of the parties  contained in or made pursuant to
this Agreement or any Collateral  Document shall survive the Closing (unless any
such  covenant or agreement by its express terms in this  Agreement  does not so
survive) and shall remain operative and in full force and effect for the statute
of  limitations  applicable  to  contractual  obligations.  The term  "Indemnity
Period" shall mean the applicable period with respect to which a representation,
warranty,  covenant  or  agreement  survives  the  Closing as  provided  in this
Section. No claim for  indemnification,  other than with respect to fraud may be
asserted after the expiration of the Indemnity Period.  Notwithstanding anything
herein to the contrary,  any  representation,  warranty,  covenant and agreement
which arises and is the subject of a Claim which is asserted in writing prior to
the expiration of the applicable  Indemnity Period shall survive with respect to
such  Claim or any  dispute  with  respect  thereto  until the final  resolution
thereof.

                                      -32-
<PAGE>
         9.2      Indemnification.

         (a) TCT  agrees,  with  respect  to the  extent  of each  TCT  Member's
interest  in the Escrow  Indemnity  Funds on behalf of each TCT  Member,  to the
extent  provided in this Article 9, including  without  limitation  Section 9.3,
that on and after the  Closing ATC and ATMC and their  respective  Subsidiaries,
stockholders,   directors,   officers,  employees,  agents  and  representatives
(collectively,  the "ATC  Indemnified  Parties")  shall be indemnified  and held
harmless from and against any and all damages, claims, losses, expenses,  costs,
obligations,  and liabilities including,  without limiting the generality of the
foregoing, liabilities for all reasonable attorneys',  accountants' and experts'
fees and expenses  incurred,  including  those  incurred to enforce the terms of
this Agreement or any Collateral  Document  (collectively,  "Loss and Expense"),
suffered by the ATC  Indemnified  Parties by reason of or arising out of (i) any
breach of  representation  or warranty made by TCT pursuant to this Agreement or
any Collateral  Document,  and (ii) any failure by TCT to perform or fulfill any
of its covenants or  agreements  set forth in this  Agreement or any  Collateral
Document.

         (b) ATC and ATMC,  jointly and  severally,  agree that on and after the
Closing they will indemnify each former TCT Member and hold it harmless from and
against all Loss and Expense suffered by any of them by reason of or arising out
of (i) any breach of  representation or warranty made by ATC or ATMC pursuant to
this Agreement or any Collateral  Document,  and (ii) any failure by ATC or ATMC
to perform or  fulfill  any of its  covenants  or  agreements  set forth in this
Agreement or any Collateral Document.

         9.3      Limitation of Liability.

         (a)  Notwithstanding  the provisions of Section 9.2, after the Closing,
the ATC Indemnified  Parties, on the one hand, and the TCT Members, on the other
hand,  shall be  entitled  to recover  their Loss and  Expense in respect of any
Claim only (i) in the event that the  aggregate  Loss and Expense for all Claims
exceed, in the aggregate,  $500,000,  in which event the indemnified party shall
be entitled to recover all such Loss and Expense  including such  $500,000;  and
(ii) to the extent  that the  aggregate  Loss and  Expense for all Claims do not
exceed $5,000,000.

         (b)  Anything  in this  Agreement,  including  without  limitation  the
provisions of Sections 9.2 or 9.3(a), to the contrary notwithstanding, except as
provided in Section  9.6, (i) the  exclusive  recourse of any and all of the ATC
Indemnified  Parties  after the Closing with respect to the liability of the TCT
Members  pursuant to Section 9.2 or any other  provision  of this  Agreement  or
Applicable  Law which  requires  the TCT  Members to defend,  indemnify  or hold
harmless any and all of the ATC Indemnified Parties from or against any Claim or
Loss  and  Expense  shall be the  Escrow  Indemnity  Funds  (as  defined  in the
Indemnity  Escrow  Agreement);  and  (ii)  any and  all of the  ATC  Indemnified
Parties's  remedies for any such  liability of any TCT Member,  or for any Claim
arising under this Agreement,  shall be limited to its right to recover from the
Escrow Indemnity Funds in accordance with the provisions of the Indemnity Escrow
Agreement,  and none of the ATC  Indemnified  Parties  shall  have any  right of
recovery against any TCT Member or any of its officers, directors, shareholders,
agents  or  Affiliates  or  against  the  assets  of any of them  for  any  such
liability.

         (c) In the case any event shall occur which would otherwise entitle any
party to assert a claim for indemnification hereunder, no Loss and Expense shall
be deemed to have been  sustained  by such party to the  extent of any  proceeds
received by such party from any insurance policies with respect thereto.

         9.4 Notice of Claims.  If an  indemnified  party  believes  that it has
suffered or incurred  any Loss and  Expense,  it shall  notify the  indemnifying
party promptly in writing, and in any event within the

                                      -33-
<PAGE>
applicable  Indemnity Period specified in Section 9.1,  describing such Loss and
Expense,  all with  reasonable  particularity  and containing a reference to the
provisions  of this  Agreement  in respect of which such Loss and Expense  shall
have  occurred.  If any Legal Action is instituted by a third party with respect
to which an indemnified  party intends to claim any liability or expense as Loss
and Expense under this Article, such indemnified party shall promptly notify the
indemnifying  party of such  Legal  Action,  but the  failure  to so notify  the
indemnifying  party shall not relieve such indemnifying party of its obligations
under this Article,  except to the extent such failure to notify prejudices such
indemnifying party's ability to defend against such Claim.

         9.5 Defense of Third Party Claims.  The  indemnifying  party shall have
the  right  to  conduct  and  control,  through  counsel  of its  own  choosing,
reasonably  acceptable to the indemnified party, any third party Legal Action or
other Claim, but the indemnified party may, at its election,  participate in the
defense  thereof at its sole cost and expense;  provided,  however,  that if the
indemnifying  party shall fail to defend any such Legal  Action or other  Claim,
then the indemnified party may defend, through counsel of its own choosing, such
Legal Action or other Claim, and (so long as it gives the indemnifying  party at
least fifteen (15) days' notice of the terms of the proposed  settlement thereof
and permits the indemnifying party to then undertake the defense thereof) settle
such Legal Action or other Claim and to recover the amount of such settlement or
of any  judgment and the  reasonable  costs and  expenses of such  defense.  The
indemnifying party shall not compromise or settle any such Legal Action or other
Claim without the prior written consent of the indemnified  party, which consent
shall not  unreasonably  be withheld,  delayed or  conditioned  if the terms and
conditions of such compromise or settlement  proposed by the indemnifying  party
and agreed to in writing by the claimant in such Legal Action or other Claim (a)
include a full release of the  indemnified  party from the Legal Action or other
Claim  which  is  the  subject  of  the  Settlement  Proposal,  and  (b)  if the
indemnified  party  is an ATC  Indemnified  Party,  do not  include  any term or
condition which would restrict in any material manner the continued ownership or
operations of the TCT Assets or the conduct of the TCT Business in substantially
the manner then being owned, operated and conducted by ATMC (or any successor or
assign). No matter whether an indemnifying party defends or prosecutes any third
party Legal Action or Claim,  the  indemnified  and  indemnifying  parties shall
cooperate in the defense or prosecution thereof.  Such cooperation shall include
access during normal business hours afforded to the  indemnifying  party to, and
reasonable  retention by the indemnified party of, records and information which
are  reasonably  relevant to such third party Legal Action or Claim,  and making
employees  available  on a  mutually  convenient  basis  to  provide  additional
information  and  explanation  of  any  material  provided  hereunder,  and  the
indemnifying  party shall reimburse the indemnified party for all its reasonable
out-of-pocket expenses in connection therewith.

         9.6 Exclusive Remedy. Except for fraud, the indemnification provided in
this Article shall be the sole and exclusive  post-Closing  remedy  available to
any party against any other party for any Claim under this Agreement.

         9.7 Indemnification of Directors and Officers.

         (a) From and after the Effective  Time,  ATC and the  Surviving  Entity
shall,  jointly and severally,  indemnify,  defend and hold harmless the present
and former officers,  Management Committee  representatives and employees of TCT
and any of its Subsidiaries, and any Person who is or was serving at the request
of TCT as an officer,  director or employee or agent of another Person,  against
all losses,  expenses,  claims, damages or liabilities arising out of actions or
omissions   occurring  on  or  prior  to  the  Effective  Time   (including  the
transactions  contemplated  by this  Agreement) to the fullest extent  permitted
under  Applicable  Law (and shall  also,  subject to the  provisions  of Section
9.7(d),  advance  expenses as incurred to the  fullest  extent  permitted  under
Applicable Law; provided, however, that the Person to whom

                                      -34-
<PAGE>

expenses are advanced provides an undertaking,  reasonably satisfactory in form,
scope  and  substance  to  ATC,  to  repay  such  advances  if it is  ultimately
determined  that such Person is not entitled to  indemnification);  and provided
further, however, that such indemnification shall be provided only to the extent
any  directors'  and  officers'   liability  insurance  policy  of  ATC  or  its
Subsidiaries  does not  provide  coverage  and actual  payment  thereunder  with
respect to the  matters  that  would  otherwise  be  subject to  indemnification
hereunder (it being understood that ATC or the Surviving  Entity shall,  subject
to the  provisions  of Section  9.7(d),  advance  expenses on a current basis as
provided in this Section  notwithstanding  such insurance coverage to the extent
that  payments  thereunder  have not yet  been  made,  in which  case ATC or the
Surviving  Entity,  as the case may be,  shall be entitled to  repayment of such
advances from the proceeds of such insurance coverage).

         (b) ATC and ATMC agree that all  rights to  indemnification,  including
provisions  relating to  advances of expenses  incurred in defense of any Claim,
existing in favor of the present or former Management Committee representatives,
directors,  officers,  employees,  fiduciaries  and  agents of TCT or any of its
Subsidiaries,  and any Person who is or was  serving at the request of TCT as an
officer, director or employee or agent (collectively, the "Indemnified Parties")
as provided in the Amended and Restated  Operating  Agreement of TCT or pursuant
to other  agreements,  or  certificates of  incorporation  or by-laws or similar
documents  of any of  TCT's  Subsidiaries,  as in  effect  as of the date of the
Original  Merger  Agreement,  with  respect to  matters  occurring  through  the
Effective  Time,  shall survive the Merger and shall  continue in full force and
effect  for a  period  of not less  than six  years  from  the  Effective  Time;
provided,  however,  that all rights to  indemnification in respect of any Claim
asserted,  made or commenced  within such period shall  continue until the final
disposition of such Claim.

         (c) ATC shall  maintain in effect for not less than six years after the
Effective  Time the  current  policies of  directors'  and  officers'  liability
insurance  maintained  by TCT and  its  Subsidiaries  with  respect  to  matters
occurring  prior to the  Effective  Time;  provided,  however,  that (i) ATC may
substitute  therefor policies of at least the same coverage containing terms and
conditions which are not materially less advantageous to the Indemnified Parties
with an insurance  company or companies,  the claims paving  ability of which is
substantially  equivalent to the claims paying ability of the insurance  company
or companies providing such insurance coverage for directors and officers of ATC
and (ii) ATC shall not be required to pay an annual  premium for such  insurance
in excess of two (2) times the last annual premium paid prior to the date of the
Original Merger  Agreement,  but in such case shall purchase as much coverage as
possible for such amount.

         (d) In the event that any Claim relating hereto or to the  transactions
contemplated  by this  Agreement is commenced,  before the Effective  Time,  the
parties hereto agree to cooperate and use their respective reasonable efforts to
vigorously defend against and respond thereto.  Any Indemnified Party wishing to
claim  indemnification  under  Section  9.7(a) upon  learning of any such claim,
action,  suit,  proceeding or investigation,  shall promptly notify ATC thereof,
whereupon ATC or the Surviving  Entity shall have the right,  from and after the
Effective  Time,  to assume  and  control  the  defense  thereof,  and upon such
assumption,  neither  ATC nor the  Surviving  Entity  shall  be  liable  to such
Indemnified  Parties  for any  legal  expenses  of other  counsel  or any  other
expenses  subsequently  incurred by such Indemnified  Parties in connection with
the defense  thereof.  Neither ATC nor the Surviving  Entity shall be liable for
any settlement effected without its prior written consent.

         (e) This Section 9.7 is intended to benefit the Indemnified Parties and
shall be binding on all successors and assigns of ATC and the Surviving Entity.

                                      -35-
<PAGE>
                                   ARTICLE 10

                               GENERAL PROVISIONS

         10.1 Waivers; Amendments. Changes in or additions to this Agreement may
be made,  or compli  ance  with any  term,  covenant,  agreement,  condition  or
provision  set forth herein may be omitted or waived  (either  generally or in a
particular  instance and either  retroactively or prospectively)  with, but only
with,  the  consent in writing of the  parties  hereto.  No delay on the part of
either  party at any time or times in the  exercise of any right or remedy shall
operate as a waiver thereof. Any consent may be given subject to satisfaction of
conditions  stated therein.  The failure to insist upon the strict provisions of
any  covenant,  term,  condition  or other  provision  of this  Agreement  or to
exercise any right or remedy hereunder shall not constitute a waiver of any such
covenant,  term,  condition or other provision  thereof or default in connection
therewith. The waiver of any covenant, term, condition or other provision hereof
or  default  hereunder  shall not affect or alter  this  Agreement  in any other
respect, and each and every covenant, term, condition or other provision of this
Agreement shall, in such event,  continue in full force and effect, except as so
waived,  and shall be  operative  with  respect  to any other then  existing  or
subsequent default in connection herewith.

         10.2 Fees, Expenses and Other Payments.

         (a) All transfer Taxes,  sales Taxes,  recording or documentary  Taxes,
stamps  or other  charges  levied  by any  Authority  in  connection  with  this
Agreement,  the consummation of the Merger and the subsequent or contemporaneous
actual or deemed  liquidation  of TCT into ATI as well as all costs and expenses
in connection with such Taxes, stamps or other charges shall be borne equally by
TCT and ATC,  all costs  referred to in Sections  6.7,  6.8 and 7.2(j)  shall be
borne by ATC,  all  Hart-Scott-Rodino  filing fees and  expenses  shall be borne
equally by TCT and ATC, and all other costs and expenses  incurred in connection
with this  Agreement  and the  consummation  of the  Merger,  including  without
limitation fees and disbursements of counsel, financial advisors and accountants
incurred by the parties hereto,  shall,  unless otherwise  provided  herein,  be
borne  solely  and  entirely  by the party  which has  incurred  such  costs and
expenses.  All such costs and  expenses to be borne by TCT shall,  to the extent
not then paid, be accrued for purposes of determining  the Current Balance as of
the  Effective  Time.  Such  accrual  shall also  include all costs and expenses
(including  without  limitation all transfer  Taxes,  sales Taxes,  recording or
documentary  Taxes,  stamps  or  other  charges  levied  by  any  Authority)  in
connection of transferring into the name of TCT all property,  real, personal or
mixed, held by any predecessor Entity.

         (b) At the Closing,  ATC shall  transfer to an escrow account an amount
of cash equal to the aggregate  amount of Taxes accrued pursuant to the last two
sentences of Section  10.2(a) for purposes of determining the Current Balance as
of the Effective Time  (collectively,  "Accrued Transfer  Taxes").  The terms of
such escrow  arrangement  shall provide that: (i) if TCT is not liquidated  into
ATI within three (3) months after the Closing Date,  then an amount equal to all
Accrued  Transfer  Taxes that were  accrued  based on the  assumption  that such
liquidation  would occur shall be paid to the TCT Members in proportion to their
ownership  of TCT  Units as of the  Effective  Time,  and (ii) if the  amount of
Accrued  Transfer  Taxes  exceeds the amount of Taxes  actually paid by ATI, and
required to be borne by TCT pursuant to Section 10.2(a),  then such excess shall
be paid,  from time to time, to the TCT Members in proportion to their ownership
of TCT Units as of the Effective Time; provided, however, that ATI need not make
any such payment unless it exceeds $10,000 in the aggregate.

         10.3  Notices.  All  notices  and  other  communications  which  by any
provision of this Agreement are required or permitted to be given shall be given
in writing and shall be deemed to have been delivered

                                      -36-
<PAGE>
(a) three (3) business days after being mailed by  first-class  or express mail,
postage  prepaid,  (b) the next day when sent  overnight by  recognized  courier
service, (c) upon confirmation when sent by telex,  telegram,  telecopy or other
form of rapid  transmission,  confirmed  by mailing  (by first  class or express
mail, postage prepaid, or by recognized courier service) written confirmation at
substantially  the same time as such rapid  transmission,  or (d) upon  delivery
when  personally  delivered  to the  receiving  party  (which  if other  than an
individual  shall be an  officer  or other  responsible  party of the  receiving
party). All such notices and communications  shall be mailed,  sent or delivered
as follows:

         (a)      If to ATC, ATI or ATMC:

                  116 Huntington Avenue
                  Boston, Massachusetts 02116
                  Attention:   Joseph L. Winn, Chief Financial Officer
                  Telecopier No.:  (617) 375-7575

                  with a copy to (which shall not constitute  notice to ATC, ATI
                  OR ATMC):

                  Sullivan & Worcester LLP
                  One Post Office Square
                  Boston, Massachusetts 02109
                  Attention:  Norman A. Bikales, Esq.
                  Telecopier No.:  (617) 338-2880

         (b)      If to TCT:

                  1525 Wilson Blvd.
                  Suite 500
                  Arlington, VA 22209
                  Attention:  Randall N. Smith
                  Telecopier No.:  (703) 247-2135

                  with copies to (which  shall not  constitute  notice to TCT or
                  any TCT Member):

                  Cox Telecom Towers, Inc.
                  1400 Lake Hearn Dr. N.E.
                  Atlanta, GA 30319
                  Attention:  Dean Eisner
                  Telecopier No.:  (404) 847-6110

                  Dow, Lohnes & Albertson, PLLC
                  1200 New Hampshire Avenue
                  Suite 800
                  Washington, DC  20036
                  Attention:  Stuart A. Sheldon, Esq.
                  Telecopier No.:  (202) 776-2222


                                      -37-
<PAGE>
                  Cameron & Mittleman
                  56 Exchange Terrace
                  Providence, RI 02903
                  Attention:  David L. Mayer, Esq.
                  Telecopier No.:  (401) 454-4526

or to such other person(s),  telex or facsimile  number(s) or address(es) as the
party to receive any such communication or notice may have designated by written
notice to the other party.

         10.4  Specific  Performance;  Other  Rights  and  Remedies.  Each party
recognizes and agrees that in the event the other party should refuse to perform
any of its  obligations  under this  Agreement or any Collateral  Document,  the
remedy at law would be inadequate and agrees that for breach of such provisions,
each party shall,  in addition to such other  remedies as may be available to it
at law or in equity or as provided  in Article  10, be  entitled  to  injunctive
relief and to enforce its rights by an action for  specific  performance  to the
extent permitted by Applicable Law. Each party hereby waives any requirement for
security  or the  posting  of any bond or other  surety in  connection  with any
temporary or permanent award of injunctive, mandatory or other equitable relief.
Subject to the  provisions of Section 9.3,  nothing  herein  contained  shall be
construed as prohibiting any party from pursuing any other remedies available to
it pursuant to the  provisions  of this  Agreement  or  Applicable  Law for such
breach or  threatened  breach,  including  without  limitation  the  recovery of
damages;  provided,  however,  that none of the parties shall  pursue,  and each
party hereby waives, any punitive,  incidental and consequential damages arising
out of this Agreement  (including  without  limitation damages for diminution in
value and loss of anticipated profits).

         10.5 Severability.  If any term or provision of this Agreement shall be
held or deemed  to be, or shall in fact be,  invalid,  inoperative,  illegal  or
unenforceable  as  applied  to  any  particular  case  in  any  jurisdiction  or
jurisdictions,  or in  all  jurisdictions  or  in  all  cases,  because  of  the
conflicting of any provision with any  constitution or statute or rule of public
policy or for any other reason,  such circumstance  shall not have the effect of
rendering the provision or provisions in question invalid, inoperative,  illegal
or unenforceable in any other  jurisdiction or in any other case or circumstance
or of rendering any other  provision or  provisions  herein  contained  invalid,
inoperative,  illegal or  unenforceable to the extent that such other provisions
are not themselves actually in conflict with such constitution,  statute or rule
of public policy, but this Agreement shall be reformed and construed in any such
jurisdiction or case as if such invalid,  inoperative,  illegal or unenforceable
provision had never been contained herein and such provision reformed so that it
would be valid,  operative and  enforceable to the maximum  extent  permitted in
such jurisdiction or in such case.  Notwithstanding the foregoing,  in the event
of any such  determination  the  effect  of which is to  affect  materially  and
adversely any party,  the parties  shall  negotiate in good faith to modify this
Agreement  so as to effect  the  original  intent of the  parties  as closely as
possible to the fullest  extent  permitted by  Applicable  Law in an  acceptable
manner to the end that the  Transactions  are fulfilled and  consummated  to the
maximum extent possible.

         10.6   Counterparts.   This   Agreement  may  be  executed  in  several
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same  instrument,  binding upon all of the
parties. In pleading or proving any provision of this Agreement, it shall not be
necessary to produce more than one set of such counterparts.

         10.7 Section Headings. The headings contained in this Agreement are for
reference  purposes  only  and  shall  not in any  way  affect  the  meaning  or
interpretation of this Agreement.

                                      -38-
<PAGE>

         10.8 Governing Law; Venue. The validity,  interpretation,  construction
and  performance  of this  Agreement  shall be  governed  by, and  construed  in
accordance  with,  the  applicable  laws of the United States of America and the
laws of State of New York  applicable  to contracts  made and  performed in such
State and, in any event, without giving effect to any choice or conflict of laws
provision or rule that would cause the application of domestic  substantive laws
of any other jurisdiction,  except to the extent the DCL or the DLLCA applies to
the Merger. Anything in this Agreement to the contrary  notwithstanding,  in the
event of any dispute  between the parties which  results in a Legal Action,  the
prevailing  party  shall be entitled to receive  from the  non-prevailing  party
reimbursement for reasonable legal fees and expenses incurred by such prevailing
party in such Legal Action. In the event of any Legal Action between the parties
arising out of this  Agreement,  the  parties  agree to submit the matter to the
Delaware  Chancery Court, and the parties agree to submit to the jurisdiction of
such court.

         10.9 Further Acts. Each party agrees that at any time, and from time to
time, before and after the consummation of the transactions contemplated by this
Agreement,  it  will do all  such  things  and  execute  and  deliver  all  such
Collateral  Documents  and other  assurances,  as any other party or its counsel
reasonably  deems  necessary  or  desirable  in order to carry out the terms and
conditions of this  Agreement  and the  transactions  contemplated  hereby or to
facilitate  the enjoyment of any of the rights  created  hereby or to be created
hereunder.

         10.10  Entire  Agreement.   This  Agreement   (together  with  the  TCT
Disclosure Schedule, the Exhibits the other Collateral Documents,  and the other
documents delivered or to be delivered in connection  herewith)  constitutes the
entire  agreement of the parties with respect to the subject  matter  hereof and
supersedes all prior agreements, arrangements,  covenants, promises, conditions,
undertakings,   inducements,   representations,   warranties  and  negotiations,
expressed or implied, oral or written,  between the parties, with respect to the
subject  matter hereof,  including  without  limitation any previously  executed
confidentiality  agreements  and  letters  of intent.  Each of the  parties is a
sophisticated  Person that was advised by experienced counsel and, to the extent
it deemed necessary,  other advisors in connection with this Agreement.  Each of
the parties hereby  acknowledges that (a) none of the parties has relied or will
rely in respect of this Agreement or the transactions  contemplated  hereby upon
any  document  or  written  or  oral  information  previously  furnished  to  or
discovered by it or its  representatives,  other than this Agreement (or such of
the foregoing as are  delivered at the  Closing),  (b) there are no covenants or
agreements by or on behalf of any party or any of its  respective  Affiliates or
representatives  other than those  expressly set forth in this Agreement and the
Collateral  Documents,  and (c) the parties'  respective  rights and obligations
with respect to this Agreement and the events giving rise thereto will be solely
as set forth in this Agreement and the Collateral  Documents.  WITHOUT  LIMITING
THE GENERALITY OF THE FOREGOING,  EACH PARTY HERETO AGREES THAT,  EXCEPT FOR THE
REPRESENTATIONS  AND  WARRANTIES  CONTAINED IN THIS AGREEMENT AND ANY COLLATERAL
DOCUMENT, NONE OF THE PARTIES MAKES ANY OTHER REPRESENTATIONS OR WARRANTIES, AND
EACH HEREBY DISCLAIMS ANY OTHER  REPRESENTATIONS OR WARRANTIES MADE BY ITSELF OR
ANY OF ITS OFFICERS, DIRECTORS,  EMPLOYEES, AGENTS, FINANCIAL AND LEGAL ADVISORS
OR OTHER  REPRESENTATIVES,  WITH RESPECT TO THE  EXECUTION  AND DELIVERY OF THIS
AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY,  NOTWITHSTANDING THE DELIVERY
OR DISCLOSURE TO THE OTHER OR THE OTHER'S  REPRESENTATIVES  OF ANY DOCUMENTATION
OR OTHER INFORMATION WITH RESPECT TO ANY ONE OR MORE OF THE FOREGOING.

         10.11  Assignment.  This Agreement shall not be assignable by any party
and any such  assignment  shall be null and void,  except that it shall inure to
the benefit of and be binding  upon any  successor  to any party by operation of
law,  including by way of merger,  consolidation or sale of all or substantially
all of its 

                                      -39-

<PAGE>
assets,  and ATC may assign its rights  and  remedies  hereunder  to any bank or
other financial  institution which has loaned funds or otherwise extended credit
to it.

         10.12  Parties in Interest.  This  Agreement  shall be binding upon and
inure  solely to the  benefit of each  party,  and  nothing  in this  Agreement,
express or implied,  is  intended to or shall  confer upon any Person any right,
benefit or remedy of any nature whatsoever under or by reason of this Agreement,
except as otherwise provided in Section 10.11.

         10.13  Mutual  Drafting.  This  Agreement  is the  result  of the joint
efforts of TCT and ATC, and each provision hereof has been subject to the mutual
consultation,  negotiation  and  agreement  of the parties and there shall be no
construction  against  any  party  based  on any  presumption  of  that  party's
involvement in the drafting thereof.

         10.14 TCT Disclosure Schedule.  TCT will deliver to ATC, on or prior to
December 14, 1998, the TCT Disclosure  Schedule and all other documents required
to be delivered by TCT pursuant to Article 4 of this Agreement. Without limiting
the  generality of the foregoing,  the TCT  Disclosure  Schedule shall set forth
TCT's  proposal  with  respect  to  which  modifications,  if  any,  of  Private
Authorizations, Leases and Material Agreements are proposed to be a condition to
Closing pursuant to the provisions of Section 7.2(d).  ATC shall have the right,
for a period commencing upon its receipt of the TCT Disclosure Schedule and each
other  document  together with a letter from TCT  indicating  that such delivery
constitutes  a "final  and  complete"  delivery  pursuant  to this  Section  and
terminating  at 11:59 p.m.  on the tenth  (10th)  business  day  following  such
receipt, (a) to terminate this Agreement, if the TCT Disclosure Schedule reveals
any  Event of  which  ATC was  unaware  as of the  date of the  Original  Merger
Agreement, which unknown Events,  individually or in the aggregate, would have a
material  adverse  effect on TCT, and (b) to propose to TCT  alternatives  as to
which  Private   Authorizations,   Leases  and  Material  Agreements  and  which
modifications,  if any, of Leases and Material  Agreements are to be a condition
to Closing  pursuant to the provisions of Section 7.2(d).  In the event TCT does
not agree to any proposal of ATC  pursuant to clause (b) of the prior  sentence,
TCT and ATC shall be  obligated  to  negotiate  in good  faith  with  respect to
resolving such matters.  In the event ATC and TCT do not agree in writing on the
resolution of matters raised by any proposal made by ATC pursuant to such clause
(b) on or prior to ten (10) business days of receipt by TCT of any such proposal
of ATC (the "Interim Period") either party may, on or prior to ten (10) business
days (the "Termination Period"), following the expiration of the Interim Period,
terminate  this  Agreement.  In the event neither party shall have so terminated
this Agreement on or prior to the expiration of the Termination  Period,  or, in
the  event  ATC  makes no  proposal  pursuant  to  clause  (b) of the  preceding
paragraph,  this  Agreement  shall  continue  in full  force and  effect and the
original  proposal of TCT (as set forth in Section  7.2(d) of the TCT Disclosure
Schedule)  shall control for purposes of  determining  the conditions of Closing
set forth in Section 7.2(d). The disclosures in the TCT Disclosure  Schedule are
to be taken as relating to all of the representations and warranties of TCT. The
disclosure  of a particular  item in the TCT  Disclosure  Schedule  shall not be
construed  as an admission by TCT that such matter falls within the scope of any
applicable  materiality or other  qualifications  or  limitations,  or that such
matter has had or is reasonably  likely to have a material  adverse  effect.  In
addition,  to the extent the TCT Disclosure  Schedule  includes matters that are
not required by this Agreement to be reflected on such TCT Disclosure  Schedule,
such additional  matters are set forth for  information  purposes only and shall
not be construed as expanding  the scope of any  representations,  warranties or
covenants of TCT hereunder.  Any reference in the TCT  Disclosure  Schedule to a
contract,  agreement,  instrument,  document, order, decree or judgment shall be
deemed to include a reference to all amendments and  modifications  thereof,  if
any, so long as such amendments and  modifications  are made available to ATC as
part of its due diligence  investigation.  In the event either party  terminates
this Agreement  pursuant to the provisions of this Section,  neither party shall
have any  liability  to the  other.  The  rights of ATC in this  Section  are in
addition to those set forth in Section 10.15.

                                      -40-

<PAGE>

         10.15 ATC's Due Diligence.  On or prior to December 18, 1998, ATC shall
have completed its due diligence investigation of TCT and the TCT Assets and the
TCT  Business.  ATC shall  have the right,  at any time  prior to 11:59 p.m.  on
December 18, 1998 to terminate this Agreement if such investigation  reveals any
Event of which ATC was unaware as of the date of the Original Merger  Agreement,
which unknown Events,  individually  or in the aggregate,  would have a material
adverse effect on TCT.  Without  limiting the  generality of the foregoing,  ATC
shall have been  satisfied as a consequence  of such due diligence  that TCT and
each of its Subsidiaries has at all times been classified as a partnership under
the  Code,  and that  neither  TCT nor any of its  Subsidiaries  has ever been a
publicly traded  partnership  treated as a corporation under Section 7704 of the
Code. In the event ATC terminates  this Agreement  pursuant to the provisions of
this Section, neither party shall have any liability to the other. The rights of
ATC in this Section are in addition to those set forth in Section 10.14.

         10.16  Original  Merger  Agreement.  Notwithstanding  anything  to  the
contrary in Section 10.1 of the Original Merger Agreement,  this Agreement shall
not amend or restate the Original  Merger  Agreement,  and the  Original  Merger
Agreement  shall  continue  in full force and effect  without any  amendment  or
modification  thereof  pursuant to the provisions of this Agreement,  until such
time as this Agreement shall have been approved and adopted by the required vote
of the TCT Members.


                      [SIGNATURES APPEAR ON FOLLOWING PAGE]


                                      -41-


<PAGE>

         IN WITNESS WHEREOF,  the parties have executed this Agreement or caused
this  Agreement  to be  executed by their  respective  officers  thereunto  duly
authorized as of the date first written above.

                                    American Tower Corporation


                                    By:  ____________________________________
                                            Name:
                                            Title:



                                    ATC Merger Corporation


                                    By:  ____________________________________
                                            Name:
                                            Title:


                                    American Towers, Inc.


                                    By:_____________________________________
                                            Name:
                                            Title:


                                    TeleCom Towers, L.L.C.


                                    By:______________________________________
                                            Name:
                                            Title:


                                      -42-


<PAGE>
                                                                      APPENDIX A

                                   DEFINITIONS

         Accrued  Transfer  Taxes shall have the meaning  given to it in Section
10.2(b).

         Adjustment Holdback shall have the meaning given to it in Section 3.4.

         adverse,  adversely, when used alone or in conjunction with other terms
(including  without  limitation  "affect," "change" and "effect") shall mean any
Event which is reasonably  likely,  in the reasonable  business  judgment of the
relevant  party,  to be  expected  to  (a)  adversely  affect  the  validity  or
enforceability  of this  Agreement  or the  likelihood  of  consummation  of the
Merger,  or (b)  adversely  affect  the  business,  operations,  management,  or
properties,  or the  financial  condition,  or results of  operation  of the TCT
Assets or the TCT  Business or ATC and its  Subsidiaries,  taken as a whole,  as
applicable,  or (c) impair such party's ability to fulfill its obligations under
the terms of this Agreement,  or (d) adversely  affect the aggregate  rights and
remedies of such party under this Agreement.  Notwithstanding the foregoing, and
anything in this Agreement to the contrary notwithstanding, the following events
shall not be deemed to constitute such a change,  affect or effect:  (i) changes
in the financial markets or general economic conditions and Events affecting the
communications sites industry generally, including without limitation conditions
or changes which affect the prevailing  interest  rates  available to businesses
involved in the  communications  sites  industry or which affect the  prevailing
resale  valuation or the method of determining such valuations of the businesses
involved in the  communications  sites  industry,  and (ii) the  resignation  or
retirement  of any  TCT  employee  or  group  of TCT  employees  because  of the
execution and delivery of this Agreement.

         Affiliate,  Affiliated shall mean, with respect to any Person,  (a) any
other Person at the time  directly or indirectly  controlling,  controlled by or
under direct or indirect  common control with such Person,  (b) any other Person
of which such Person at the time owns, or has the right to acquire,  directly or
indirectly,  twenty  percent  (20%) or more of any class of the capital stock or
beneficial  interest,  (c) any other Person  which at the time owns,  or has the
right to acquire,  directly or  indirectly,  twenty percent (20%) or more of any
class of the  capital  stock or  beneficial  interest  of such  Person,  (d) any
executive  officer  or  director  of  such  Person,  (e)  with  respect  to  any
partnership,  joint venture or similar Entity, any general partner thereof,  and
(f) when used with respect to an  individual,  shall  include any member of such
individual's family or a family trust.

         Agreement shall mean this Agreement as originally in effect, including,
unless the context  otherwise  specifically  requires,  this Appendix A, the TCT
Disclosure  Schedule,  the ATC SEC Documents and all exhibits hereto, and as any
of the same may from time to time be supplemented, amended, modified or restated
in the manner herein or therein provided.

         Alternative  Transaction  shall mean a transaction or series of related
transactions  (other than the Transactions)  resulting in or likely to result in
(a) any  Change  of  Control  of TCT,  (b) any  merger,  consolidation  or other
business  combination of TCT,  regardless of whether TCT is the surviving Entity
unless the surviving  Entity remains  obligated under this Agreement to the same
extent  as TCT  was,  (c)  any  tender  offer  or  exchange  offer  for,  or any
acquisition of, any securities of TCT, (d) any sale or other  disposition of all
or any  substantial  part of the assets or  business  of TCT,  or (e) any issue,
sale,  transfer,  pledge,  assignment or other  conveyance,  or any agreement to
issue,  sell,  transfer,   pledge,   assign  or  otherwise  convey,  any  equity
securities, Convertible Securities or Option Securities by TCT or any TCT Member
that could result in a Change of Control of TCT.


                                       A-1
<PAGE>
         Applicable Law shall mean any Law of any Authority, whether domestic or
foreign,  including  without  limitation  the  FCA  and all  federal  and  state
securities and  Environmental  Laws, to which a Person is subject or by which it
or any of its business or operations is subject or any of its property or assets
is bound.

         ATC shall have the meaning given to it in the Preamble.

         ATC Common Stock shall have the meaning given to it in Section 3.1.

         ATC Financial  Statements shall have the meaning given to it in Section
5.2.

         ATC  Indemnified  Parties shall have the meaning given to it in Section
9.2(a).

         ATC  Noncompetition  Agreements  shall have the meaning  given to it in
Section 7.2(p).

         ATC SEC Documents shall have the meaning given to it in Section 5.2.

         ATC Stock  Consideration  shall have the meaning given to it in Section
3.1.

         ATC  Voting  Agreement  shall have the  meaning  given to it in Section
7.3(h).

         ATC's  knowledge  (or words of  similar  import)  shall mean the actual
knowledge of any director or executive officer of ATC or ATMC, as such knowledge
existed on the date of the Original Merger Agreement, after reasonable review of
appropriate ATC and ATMC records and after reasonable inquiry of appropriate ATC
and ATMC employees.

         ATI shall have the meaning given to it in the Preamble.

         ATMC shall have the meaning given to it in the Preamble.

         Authority shall mean any governmental or quasi-governmental  authority,
whether  administrative,  executive,  judicial,  legislative  or  other,  or any
combination   thereof,   including  without   limitation  any  federal,   state,
territorial,   county,   municipal  or  other   government  or  governmental  or
quasi-governmental agency, arbitrator,  authority,  board, body, branch, bureau,
or comparable  agency or Entity,  commission,  corporation,  court,  department,
instrumentality,  mediator, panel, system or other political unit or subdivision
or other Entity of any of the foregoing,  whether domestic or foreign, including
without limitation the FCC.

         Benefit Arrangement shall mean any material benefit arrangement that is
not a Plan,  including  (a) any  employment  or  consulting  agreement,  (b) any
arrangement providing for insurance coverage or workers' compensation  benefits,
(c) any  incentive  bonus or deferred  bonus  arrangement,  (d) any  arrangement
providing termination  allowance,  severance or similar benefits, (e) any equity
compensation plan, (f) any deferred  compensation plan, and (g) any compensation
policy and  practice,  but only to the  extent  that it covers or relates to any
officer, employee or other Person involved in the ownership and operation of the
assets of TCT or the conduct of the business of TCT.

         Cash Consideration shall have the meaning given to it in Section 3.1.

         Ceiling Share Price shall have the meaning given to it in Section 3.1.


                                       A-2

<PAGE>
         Change of Control shall mean the  acquisition,  directly or indirectly,
by any Person or group (as such term is used in Section 13(d)(3) of the Exchange
Act) of twenty percent (20%) or more of the TCT Units.

         Claims shall mean any and all debts, liabilities,  obligations, losses,
damages,  deficiencies,  assessments  and  penalties,  together  with all  Legal
Actions, pending or threatened, claims and judgments of whatever kind and nature
relating  thereto,  and all fees, costs,  expenses and disbursements  (including
without  limitation  reasonable  attorneys'  and  other  legal  fees,  costs and
expenses) relating to any of the foregoing.

         Closing shall have the meaning given to it in Section 2.2.

         Closing Date shall have the meaning given to it in Section 2.2.

         Closing  Date Share Price shall  mean,  with  respect to the ATC Common
Stock,  the average of the daily Fair Market Values  thereof for each of the ten
(10) Trading Days prior to the Closing Date.

         COBRA shall mean the Consolidated Omnibus Budget  Reconciliation Act of
1985,  as  amended,  as set  forth  in  Section  4980B of the Code and Part 6 of
Subtitle B of Title I of ERISA.

         Code shall mean the Internal  Revenue  Code of 1986,  and the rules and
regulations  thereunder,  all as from time to time in effect,  or any  successor
Law,  rules or  regulations,  and any  reference to any  statutory or regulatory
provision  shall be deemed  to be a  reference  to any  successor  statutory  or
regulatory provision.

         Collateral  Documents shall mean the Indemnity  Escrow  Agreement,  the
Noncompetition Agreements, the Registration Rights Agreement, the TCT Investment
Letters,  the Cox  Special  Release,  the  Prime  Letter  Agreement,  the  Prime
Definitive  Agreement (if executed),  the  Certificate of Merger,  and any other
agreement, certificate,  contract, instrument, notice, opinion or other document
delivered  pursuant  to the  provisions  of  this  Agreement  or any  Collateral
Document.

         Confidential  Information shall have the meaning given to it in Section
6.1(a).

         Construction  Cost shall  mean,  with  respect  to each of the  Subject
Towers  that is not in service at the  Effective  Time,  an amount  equal to the
funded cost of such Subject Tower,  determined in accordance with GAAP,  applied
on a basis consistent with the TCT Financial Statements.

         Contract, Contractual Obligation shall mean any agreement, arrangement,
commitment,  contract, covenant,  indemnity,  undertaking or other obligation or
liability  to which  TCT is a party or to which it or any of the TCT  Assets  is
subject.

         Control (including the terms  "controlled,"  "controlled by" and "under
common control with") means the possession, directly or indirectly or as trustee
or executor,  of the power to direct or cause the direction of the management or
policies of a Person,  or the disposition of such Person's assets or properties,
whether through the ownership of stock, equity or other ownership,  by contract,
arrangement or understanding,  or as trustee or executor,  by contract or credit
arrangement or otherwise.

         Convertible Securities shall mean any evidences of indebtedness, shares
of capital  stock  (other than  common  stock) or other  securities  directly or
indirectly convertible into or exchangeable for shares of common stock, or other
securities directly or indirectly convertible into or exchangeable for TCT Units
or other  equity  interests  of TCT,  whether  or not the  right to  convert  or
exchange thereunder is immediately

                                       A-3

<PAGE>

exercisable  or is  conditioned  upon the  passage of time,  the  occurrence  or
non-occurrence or existence or non-existence of some other Event, or both.

         Cox shall mean Cox Telecom Towers, Inc., a Delaware corporation and one
of the TCT Members.

         Cox  Special  Release  shall  have the  meaning  given to it in Section
7.2(t).

         Current  Balance  shall mean,  with respect to TCT, the amount by which
the current assets of TCT and its  Subsidiaries  are more (or are less than) the
current  liabilities of TCT (exclusive of current maturities of principal of any
Indebtedness  for Money  Borrowed),  as  determined  in  accordance  with  GAAP,
consistently applied with the TCT Financial Statements.

         Current Market Price shall mean,  with respect to the ATC Common Stock,
the average of the daily Fair Market Values  thereof for each of the twenty (20)
Trading Days  commencing ten (10) Trading Days prior to the date of the Original
Merger Agreement;  provided,  however that the Current Market Price shall not be
less than $19.20 or more than $21.25.  The Current Market Price as so calculated
was $21.55 and, therefore, it is $21.25.

         DCL shall have the meaning given to it in Section 2.1.

         Distribution   shall  mean,  with  respect  to  any  Person,   (a)  the
declaration or payment of any dividend (except dividends payable in common stock
of such Person) on or in respect of any shares of any class of capital  stock of
such Person or any shares of capital stock of any  Subsidiary  owned by a Person
other  than such  Person  or a  Subsidiary  of such  Person,  (b) the  purchase,
redemption  or other  retirement  of any shares of any class of capital stock of
such  Person or any shares of capital  stock of any  Subsidiary  of such  Person
owned by a Person other than such Person or a Subsidiary of such Person, and (c)
any other  distribution  on or in  respect of any shares of any class of capital
stock of such Person or any shares of capital  stock of any  Subsidiary  of such
Person owned by a Person other than such Person or a Subsidiary of such Person.

         DLLCA shall have the meaning given to it in Section 2.1.

         Effective Time shall have the meaning given to it in Section 2.3.

         Employment Arrangement shall mean, with respect to TCT, any employment,
consulting,   retainer,   severance  or  similar  contract,   agreement,   plan,
arrangement or policy  (exclusive of any which is terminable  within thirty (30)
days  without  liability,  penalty  or  payment of any kind by TCT or any of its
Affiliates),  providing for severance,  termination payments, insurance coverage
(including any  self-insured  arrangements),  workers  compensation,  disability
benefits,   life,  health,   medical,   dental  or   hospitalization   benefits,
supplemental unemployment benefits,  vacation or sick leave benefits, pension or
retirement benefits or for deferred compensation, profit-sharing, bonuses, stock
options,  stock  purchase or  appreciation  rights or other  forms of  incentive
compensation or  post-retirement  insurance,  compensation  or benefits,  or any
collective  bargaining  or  other  labor  agreement,  whether  or not any of the
foregoing is subject to the provisions of ERISA,  but only to the extent that it
covers or relates to any  officer,  employee  or other  Person  involved  in the
ownership or operation of the TCT Assets or the conduct of the TCT Business.

         Encumber  shall  mean  to  suffer,  accept,  agree  to  or  permit  the
imposition of a Lien.

         Entity shall mean any corporation,  firm, unincorporated  organization,
association,  partnership,  limited  liability  company,  trust  (inter vivos or
testamentary), estate of a deceased, insane or incompetent

                                       A-4

<PAGE>

individual,  business  trust,  joint  stock  company,  joint  venture  or  other
organization,  entity or business, whether acting in an individual, fiduciary or
other capacity, or any Authority.

         Environmental Law shall mean any Law relating to or otherwise  imposing
liability or  standards of conduct  concerning  pollution or  protection  of the
environment,   including   without   limitation   Laws  relating  to  emissions,
discharges,  releases or  threatened  releases of  Hazardous  Materials or other
chemicals or  industrial  pollutants,  substances,  materials or wastes into the
environment (including,  without limitation,  ambient air, surface water, ground
water,  mining or reclamation or mined land, land surface or subsurface  strata)
or otherwise relating to the manufacture,  processing, generation, distribution,
use, treatment, storage, disposal, cleanup, transport or handling of pollutants,
contaminants,  chemicals or industrial, toxic or hazardous substances, materials
or wastes. Environmental Laws shall include without limitation the Comprehensive
Environmental  Response,  Compensation and Liability Act (42 U.S.C. Section 6901
et seq.), the Hazardous Material  Transportation Act (49 U.S.C.  Section 1801 et
seq.),  the Resource  Conservation  and Recovery Act (42 U.S.C.  Section 6901 et
seq.), the Federal Water Pollution Control Act (33 U.S.C. Section 1251 et seq.),
the Clean Air Act (42 U.S.C. Section 7401 et seq.), the Toxic Substances Control
Act (15 U.S.C. Section 2601 et seq.), the Occupational Safety and Health Act (29
U.S.C.  Section 651 et seq.), the Federal Insecticide  Fungicide and Rodenticide
Act (7  U.S.C.  Section  136 et  seq.),  and  the  Surface  Mining  Control  and
Reclamation  Act of 1977 (30 U.S.C.  Section  1201 et seq.),  and any  analogous
federal, state, local or foreign Laws, and the rules and regulations promulgated
thereunder  all as  from  time  to time in  effect,  and  any  reference  to any
statutory  or  regulatory  provision  shall be deemed to be a  reference  to any
successor statutory or regulatory provision.

         Environmental Permit shall mean any Governmental Authorization required
by or pursuant to any Environmental Law.

         Environmental  Report  shall  have the  meaning  given to it in Section
4.19.

         ERISA shall mean the Employee  Retirement  Income Security Act of 1974,
and the rules and regulations thereunder, all as from time to time in effect, or
any successor law, rules or  regulations,  and any reference to any statutory or
regulatory  provision  shall  be  deemed  to be a  reference  to  any  successor
statutory or regulatory provision.

         ERISA  Affiliate  shall  mean any  Person  that is  treated as a single
employer with TCT under Sections 414(b),  (c), (m) or (o) of the Code or Section
4001(b)(1) of ERISA.

         Event  shall  mean the  existence  or  occurrence  of any act,  action,
activity,  circumstance,  condition,  event,  fact,  failure  to act,  omission,
incident or practice, or any set or combination of any of the foregoing.

         Exchange Act shall mean the  Securities  Exchange Act of 1934,  and the
rules and  regulations  thereunder,  all as from time to time in effect,  or any
successor  Law,  rules or  regulations,  and any  reference to any  statutory or
regulatory  provision  shall  be  deemed  to be a  reference  to  any  successor
statutory or regulatory provision.

         Fair Market Value shall mean, with respect to the ATC Common Stock, (a)
the average of the high and low reported  sales prices,  regular way, or, in the
event that no sale takes place on any day, the average of the reported  high and
low bid and asked  prices,  regular  way,  in  either  case as  reported  on the
principal stock exchange on which such stock is listed, or, if not so listed, on
the Nasdaq  National Market System;  or (b) if such stock is not so listed,  (i)
the average of the high and low bid and high and low asked prices on such day in
the  over-the-counter  market as  reported  by Nasdaq,  or (ii) if bid and asked
prices for such

                                       A-5
<PAGE>

security on any day shall not have been reported through Nasdaq,  the average of
the bid and  asked  prices  for such  day as  furnished  by any New  York  Stock
Exchange member firm regularly making a market in such security,  or (c) if such
security is not publicly  traded,  as from time to time agreed to by ATC and the
TCT Members or, if no such agreement is reached within ten (10) business days of
good faith negotiations, as determined by an independent investment banking firm
mutually  agreeable to ATC and the TCT Members whose fees and expenses  shall be
shared equally by ATC and the TCT Members.

         FCA  shall  mean the  Communications  Act of 1934,  and the  rules  and
regulations  thereunder,  all as from time to time in effect,  or any  successor
Law,  rules or  regulations,  and any  reference to any  statutory or regulatory
provision  shall be deemed  to be a  reference  to any  successor  statutory  or
regulatory provision.

         FCC shall mean the United States Federal Communications  Commission and
shall include any successor Authority.

         Floor Share Price shall have the meaning given to it in Section 3.1.

         GAAP shall mean generally accepted  accounting  principles applied on a
consistent  basis,  (i) as set forth in  Opinions of the  Accounting  Principles
Board of the American Institute of Certified Public Accountants ("AICPA") and/or
in statements of the Financial Accounting Standards Board that are applicable in
the  circumstances as of the date in question,  (ii) when not inconsistent  with
such  opinions  and  statements,  as set forth in other AICPA  publications  and
guidelines  and/or  (iii)  that  otherwise  arise by custom  for the  particular
industry,  all as the  same  shall  exist  on the  date of the  Original  Merger
Agreement.

         Governmental  Authorizations  shall  mean all  approvals,  concessions,
consents,   franchises,   licenses,  permits,  plans,  registrations  and  other
authorizations  of all  Authorities,  including  without  limitation  the United
States Forest  Service and the Federal  Aviation  Administration,  in connection
with the  ownership  or  operation  of the TCT Assets or the  conduct of the TCT
Business.

         Governmental  Filings shall mean all filings,  including  franchise and
similar Tax  filings,  and the payment of all fees,  assessments,  interest  and
penalties associated with such filings, with all Authorities.

         Hart-Scott-Rodino Act shall mean the Hart-Scott-Rodino  Improvement Act
of 1976, as from time to time in effect, or any successor Law, and any reference
to any  statutory  provision  shall be deemed to be a reference to any successor
statutory provision.

         Hazardous  Materials  shall mean and include any  substance,  material,
waste, constituent, compound, chemical, natural or man-made element or force (in
whatever state of matter):  (a) the presence of which requires  investigation or
remediation under any Environmental  Law; or (b) that is defined as a "hazardous
waste" or  "hazardous  substance"  under any  Environmental  Law; or (c) that is
toxic, explosive,  corrosive,  etiologic,  flammable,  infectious,  radioactive,
carcinogenic,   mutagenic  or  otherwise  hazardous  and  is  regulated  by  any
applicable Authority or subject to any Environmental Law; or (d) the presence of
which on the real property owned or leased by such Person causes or threatens to
cause a nuisance upon any such real property or to adjacent  properties or poses
or threatens to pose a hazard to the health or safety of persons on or about any
such real property;  or (e) the presence of which on adjacent  properties  could
constitute a trespass by such Person; or (f) that contains gasoline, diesel fuel
or other  petroleum  hydrocarbons,  or any  by-products  or  fractions  thereof,
natural gas,  polychlorinated  biphenyls ("PCBs") and PCB-containing  equipment,
radon or other radioactive elements,  ionizing radiation,  electromagnetic field
radiation  and other  non-ionizing  radiation,  sonic  forces and other  natural
forces,  lead,  asbestos  or  asbestos-containing  materials  ("ACM"),  or  urea
formaldehyde foam insulation.

                                       A-6
<PAGE>

         Indebtedness shall mean, with respect to any Person as of any date, (a)
all items, except items of capital stock or of surplus or of general contingency
or deferred  tax  reserves or any minority  interest in any  Subsidiary  of such
Person  to  the  extent  such  interest  is  treated  as  a  liability  with  an
indeterminate  term on the consolidated  balance sheet of such Person,  which in
accordance with GAAP would be included in determining total liabilities as shown
on the  liability  side of a balance sheet of such Person,  (b) all  obligations
secured by any Lien to which any  property or asset owned or held by such Person
is  subject,  whether  or not the  obligation  secured  thereby  shall have been
assumed,  and  (c)  to  the  extent  not  otherwise  included,  all  Contractual
Obligations of such Person  constituting  capitalized leases and all obligations
of such Person with respect to Leases  constituting part of a sale and leaseback
arrangement.

         Indebtedness  for Money Borrowed shall mean, with respect to any Person
as of any date, money borrowed and Indebtedness represented by notes payable and
drafts accepted representing  extensions of credit, all obligations evidenced by
bonds,  debentures,  notes or other  similar  instruments,  the  maximum  amount
currently or at any time thereafter  available to be drawn under all outstanding
letters of credit issued for the account of such Person,  all Indebtedness  upon
which interest charges are customarily paid by such Person, and all Indebtedness
(including  capitalized lease obligations)  issued or assumed as full or partial
payment  for  property  or  services,  whether  or not any such  notes,  drafts,
obligations or Indebtedness represent Indebtedness for money borrowed, but shall
not include (a) trade payables,  (b) expenses  accrued in the ordinary course of
business,  (c) customer advance payments and customer  deposits  received in the
ordinary course of business,  or (d) conditional sales agreements not prohibited
by the terms of this Agreement.

         Indemnity  Escrow  Agreement  shall  have  the  meaning  given to it in
Section 7.2(s).

         Intangible  Assets shall mean all assets and property  lacking physical
properties the evidence of ownership of which must  customarily be maintained by
independent  registration,  documentation,  certification,  recordation or other
means,  and  shall  include,   without  limitation,   concessions,   copyrights,
franchises,  licenses, patents, permits, service marks, trademarks, trade names,
and applications with respect to any of the foregoing, technology and know-how.

         Intellectual  Property  shall mean any and all  research,  information,
inventions,  designs,  procedures,  developments,   discoveries,   improvements,
patents and applications therefor, trademarks and applications therefor, service
marks, trade names, copyrights and applications therefor,  logos, trade secrets,
drawing, plans, systems,  methods,  specifications,  computer software programs,
tapes, discs and related data processing  software (including without limitation
object and source  codes)  owned by such Person or in which it has an  ownership
interest  and all other  manufacturing,  engineering,  technical,  research  and
development data and know-how made, conceived, developed and/or acquired by such
Person,  which  relate  to the  manufacture,  production  or  processing  of any
products  developed  or sold by such  Person or which are within the scope of or
usable in connection  with such Person's  business as it may, from time to time,
hereafter be conducted or proposed to be conducted.

         Interim Period shall have the meaning given to it in Section 11.14.

         Law shall mean any (a) administrative,  judicial,  legislative or other
action,  code,  consent  decree,  constitution,  decree,  directive,  enactment,
finding, law, injunction,  interpretation,  judgment,  order, ordinance,  policy
statement, proclamation,  promulgation,  regulation,  requirement, rule, rule of
law,  rule of  public  policy,  settlement  agreement,  statute,  or writ of any
Authority, domestic or foreign; (b) the common law, or other legal precedent; or
(c)  arbitrator's,   mediator's  or  referee's  award,   decision,   finding  or
recommendation.

                                       A-7

<PAGE>

         Lease  shall mean any lease of  property,  whether  real,  personal  or
mixed, and all amendments thereto,  and shall include without limitation all use
or occupancy agreements.

         Legal  Action  shall  mean,  with  respect to any  Person,  any and all
litigation   or   legal   or   other   actions,   arbitrations,   counterclaims,
investigations, proceedings, requests for material information by or pursuant to
the  order of any  Authority  or  suits,  at law or in  arbitration,  equity  or
admiralty,  whether or not  purported  to be  brought on behalf of such  Person,
affecting such Person or any of such Person's business, property or assets.

         Lien shall mean any of the  following:  mortgage;  lien  (statutory  or
other);  or other security  agreement,  arrangement or interest;  hypothecation,
pledge  or  other  deposit  arrangement;  assignment;  charge;  levy;  executory
seizure;   attachment;   garnishment;   encumbrance   (including  any  easement,
exception,  reservation or limitation,  right of way, and the like); conditional
sale,  title  retention  or other  similar  agreement,  arrangement,  device  or
restriction;   preemptive  or  similar  right;  any  financing  lease  involving
substantially  the same economic  effect as any of the foregoing;  the filing of
any financing  statement under the Uniform  Commercial Code or comparable law of
any  jurisdiction;  restriction on sale,  transfer,  assignment,  disposition or
other alienation; or any option, equity, claim or right of or obligation to, any
other Person, of whatever kind and character.

         Loss and Expense shall have the meaning given to it in Section 9.2(a).

         material, materially or materiality for the purposes of this Agreement,
shall, unless specifically stated to the contrary,  be determined without regard
to the fact that various  provisions of this Agreement set forth specific dollar
amounts.

         Material  Agreement  shall mean,  with respect to TCT, any  Contractual
Obligation  which (a) was not entered into in the  ordinary  course of business,
(b) was entered into in the ordinary  course of business  which (i) involved the
purchase,  sale or lease  of  goods  or  materials,  or  purchase  of  services,
aggregating  more than $100,000 since  December 31, 1997,  (ii) extends for more
than three (3) months,  or (iii) is not  terminable  on thirty (30) days or less
notice without penalty or other payment or (iv) involves the leasing of space on
any tower of TCT involving not less than $10,000 in annual rental payments,  (c)
involves a capitalized lease obligation or Indebtedness for Money Borrowed,  (d)
is  or  otherwise  constitutes  a  written  agency,  broker,  dealer,   license,
distributorship,   sales  representative  or  similar  written  agreement,   (e)
accounted  for more than three  percent (3%) of the revenues of the TCT Business
in any of the last  three  fiscal  years or is likely to  account  for more than
three  percent  (3%) of revenues of the TCT Business  during the current  fiscal
year,  (f) is with  the  United  States  Forest  Service,  or (g)  involves  the
management by TCT of any communication tower of any other Person.

         Merger  shall  have  the  meaning  given  to it in  the  third  Whereas
paragraph.

         Merger Consideration shall have the meaning given to it in Section 3.1.

         Merger Price shall have the meaning given to it in Section 3.1.

         Mid Pacific shall mean Mid-Pacific-Telecom Communications Co., a Nevada
general partnership.

         Monthly Tower Revenue Run Rate shall mean an amount equal to the normal
monthly  recurring net lease revenues (e.g.,  excluding charges for installation
and  excluding  reimbursement  of  expenses,  other than those billed at a fixed
amount, which amount may vary from month to month and which shall be

                                       A-8

<PAGE>

included in normal monthly recurring net lease revenues) received by TCT and its
Subsidiaries  with respect to space rented on the towers (including net revenues
received by TCT and its  Subsidiaries  for managing  towers of other Persons) of
TCT and its  Subsidiaries,  including its  proportionate  share of the following
entities: Mid-Pacific, Shreveport Tower Company, a Louisiana general partnership
and Haysville Towers LLC, a Kansas limited liability company.

         Multiemployer  Plan shall mean a Plan which is a  "multiemployer  plan"
within the meaning of Section 4001(a)(3) of ERISA.

         New TCT  Operating  Agreement  shall  have the  meaning  given to it in
Section 2.5.

         Option Securities shall mean all stock or equity  appreciation  rights,
rights,  options and warrants, and calls or commitments evidencing the right, to
subscribe  for,  purchase or otherwise  acquire  shares of capital  stock or TCT
Units or other equity interests in TCT or Convertible Securities, whether or not
the right to  subscribe  for,  purchase  or  otherwise  acquire  is  immediately
exercisable  or is  conditioned  upon the  passage of time,  the  occurrence  or
non-occurrence or the existence or non-existence of some other Event.

         Organic  Document  shall  mean,  with  respect  to a Person  which is a
corporation,  its charter,  its by-laws and all shareholder  agreements,  voting
trusts and similar  arrangements  applicable to any of its capital  stock,  with
respect to a Person which is a  partnership,  its agreement and  certificate  of
partnership,  any  agreements  among  partners,  and any  management and similar
agreements  between the partnership  and any general  partners (or any Affiliate
thereof) or, with respect to a Person which is a limited liability company,  its
agreement of limited liability  company,  any agreements among members,  and any
management and similar  agreements between the limited liability company and any
member (or any Affiliate thereof).

         Original  Merger  Agreement  shall have the meaning  given to it in the
first Whereas paragraph.

         Permitted  Liens shall mean (a) Liens for current Taxes not yet due and
payable, (b) such imperfections of title, easements,  encumbrances and mortgages
or other Liens,  or other matters of record if any, as are not,  individually or
in the  aggregate,  substantial  in character,  amount or extent and that do not
materially detract from the value, or materially interfere with the present use,
of the property  subject thereto or affected  thereby,  or otherwise  materially
impair the conduct of the TCT  Business,  (c) Liens  securing  Indebtedness  for
Money  Borrowed of a nature  referred to in Section  7.2(q),  and (d) such other
Liens as are permitted by the provisions of this Agreement to be in place on the
Closing Date.

         Person shall mean any natural individual or any Entity.

         Personal  Property shall mean all of the machinery,  equipment,  tools,
vehicles, furniture, leasehold improvements, office equipment, plant, inventory,
spare parts and other  tangible  personal  property which are owned or leased by
TCT and used or useful as of the date of the  Original  Merger  Agreement in the
conduct of the business or operations of the TCT Business,  plus such  additions
thereto  and  deletions  therefrom  arising in the  ordinary  course of business
between the date of the Original Merger Agreement and the Closing Date.

         Plan shall mean,  with respect to any Person and at a particular  time,
any employee benefit plan which is covered by ERISA and in respect of which such
Person or an ERISA  Affiliate is (or, if such plan were terminated at such time,
would under  Section 4069 of ERISA be deemed to be) an  "employer" as defined in
Section  3(5) of ERISA,  but only to the extent that it covers or relates to any
officer, employee or

                                       A-9
<PAGE>

other Person  involved in the  ownership  and operation of the TCT Assets or the
conduct of the business of the TCT Business.

         Prime shall mean Prime-Telecom Communications Co., a California general
partnership.

         Prime Definitive Agreement shall mean the definitive purchase agreement
which may be executed by, among others, ATI and TTP as contemplated by the Prime
Letter Agreement.

         Prime Letter  Agreement  shall mean the letter  agreement,  dated as of
December , 1998,  by and between  ATC and TTP,  relating to the sale of Prime to
ATI.

         Private Authorizations shall mean all approvals, concessions, consents,
franchises,  licenses,  permits,  and other authorizations of all Persons (other
than   Authorities)   including   without   limitation  those  with  respect  to
Intellectual Property,  but excluding leases,  easements and other rights to use
real property.

         RCC shall mean RCC Consultants,  Inc., a Delaware corporation,  and its
Subsidiaries.

         Real Property shall mean all of the fee estates and buildings and other
fixtures and improvements  thereon,  leasehold interests,  easements,  licenses,
rights to access,  rights-of-way,  and other real property  interests  which are
owned or used by TCT as of the date of the  Original  Merger  Agreement,  in the
operations  of the TCT  Business,  plus such  additions  thereto  and  deletions
therefrom  arising in the  ordinary  course of business  between the date of the
Original Merger Agreement and the Closing Date.

         Registration  Rights  Agreement  shall have the meaning  given to it in
Section 7.2(m).

         Regulations  shall mean the federal income tax regulations  promulgated
under  the Code,  as such  Regulations  may be  amended  from time to time.  All
references  herein to specific  sections of the Regulations shall be deemed also
to refer to any  corresponding  provisions  of succeeding  Regulations,  and all
references  to  temporary  Regulations  shall  be  deemed  also to  refer to any
corresponding provisions of final Regulations.

         Representatives shall have the meaning given to it in Section 6.1(a).

         Restricted  Transaction  shall mean any (i) acquisition or agreement to
acquire (x) by merging or  consolidating  with,  or by  purchasing a substantial
portion of the assets of, or by any other manner,  any business or any Person or
other business organization or division thereof or (y) any assets (other than in
the ordinary  course of business which for purposes of this  definition does not
include the  acquisition  of  communications  sites and related assets and other
business  involved in the  communications  sites industry or the construction of
communications  towers and related assets), or (ii) any undertaking or agreement
to undertake the construction of one or more communications towers.

         SEC shall mean the United States Securities and Exchange Commission.

         Securities Act shall mean the Securities Act of 1933, and the rules and
regulations  thereunder,  all as from time to time in effect,  or any  successor
Law,  rules or  regulations,  and any  reference to any  statutory or regulatory
provision  shall be deemed  to be a  reference  to any  successor  statutory  or
regulatory provision.

         Solvent  shall mean,  with respect to any Person on a particular  date,
that such Person is "solvent" within the meaning of the federal  Bankruptcy Code
and applicable state insolvency and fraudulent conveyance statutes.

                                      A-10

<PAGE>

         Subsidiary shall mean, with respect to a Person,  any Entity a majority
of the capital stock  ordinarily  entitled to vote for the election of directors
of which,  or if no such voting stock is  outstanding,  a majority of the equity
interests of which, is owned directly or indirectly, legally or beneficially, by
such Person or any other Person  controlled  by such Person,  other than RCC and
TTP.

         Surviving Entity shall have the meaning given to it in Section 2.1.

         Tax (and "Taxable",  which shall mean subject to Tax), shall mean, with
respect to any Person,  (a) all taxes (domestic or foreign),  including  without
limitation any income (net, gross or other including  recapture of any tax items
such as  investment  tax  credits),  alternative  or add-on  minimum tax,  gross
income,  gross receipts,  gains,  sales, use, leasing,  lease, user, ad valorem,
transfer, recording, franchise, profits, property (real or personal, tangible or
intangible),  fuel,  license,  withholding on amounts paid to or by such Person,
payroll,  employment,  unemployment,  social security, excise, severance, stamp,
occupation, premium, environmental or windfall profit tax, custom, duty or other
tax, or other like  assessment or charge of any kind  whatsoever,  together with
any  interest,  levies,  assessments,  charges,  penalties,  additions to tax or
additional  amount  imposed  by any Taxing  Authority,  (b) any joint or several
liability of such Person with any other Person for the payment of any amounts of
the type  described in (a), and (c) any liability of such Person for the payment
of any  amounts  of the type  described  in (a) as a result  of any  express  or
implied obligation to indemnify any other Person.

         Tax Return or Returns shall mean all returns, consolidated or otherwise
(including without limitation  information  returns),  required to be filed with
any Authority with respect to Taxes.

         Taxing   Authority  shall  mean  any  Authority   responsible  for  the
imposition of any Tax.

         TCT shall have the meaning given to it in the Preamble.

         TCT Assets  shall have the  meaning  given to it in Section  4.4(a) and
shall, in any event,  include the assets of TCT's Subsidiaries,  as contemplated
by Section 4.4(a) and the final sentence of Section 4.1(d).

         TCT Business  shall have the meaning given to it in Section  4.4(b) and
shall, in any event, include the business of TCT's Subsidiaries, as contemplated
by Section 4.4(b) and the final sentence of Section 4.1(d).

         TCT Disclosure  Schedule  shall mean the TCT Disclosure  Schedule to be
furnished in accordance with Section 10.14.

         TCT Employees shall have the meaning given it in Section 4.14.

         TCT Financial  Statements shall have the meaning given to it in Section
4.2.

         TCT  Investment  Letters  shall have the meaning given to it in Section
7.2(n).

         TCT Member(s)  shall have the meaning given to such terms in the fourth
Whereas paragraph.

         TCT Units shall have the meaning given to it in Section 3.1.

         TCT's  knowledge  (or words of  similar  import)  shall mean the actual
knowledge of any TCT Member or any TCT Management  Committee  representative  or
officer, as such knowledge existed on the

                                      A-11
<PAGE>

date of the Original Merger  Agreement,  after reasonable  review of appropriate
TCT records and after reasonable inquiry of appropriate TCT employees.

         TTP shall mean TeleCom Towers-Pacific,  L.L.C., a to be formed Delaware
limited liability company and a wholly-owned Subsidiary of TCT.

         Title Report shall have the meaning given to it in Section 6.7.

         Termination Date shall have the meaning given to it in Section 8.1.

         Trading Day shall mean any day on which  shares of ATC Common Stock are
actually sold on the New York Stock Exchange.

         Transactions shall mean the transactions contemplated to be consummated
on or prior to the Closing Date, including without limitation the Merger and the
execution, delivery and performance of the Collateral Documents.





                                      A-12




                                                                     EXHIBIT 2.2

         Amendment,  dated as of December 23, 1998, by and among  American Tower
Corporation,  a Delaware corporation ("ATC"),  American Towers, Inc., a Delaware
corporation  ("ATI"), ATC Merger Corporation,  a Delaware corporation  ("ATMC"),
and TeleCom Towers, L.L.C., a Delaware limited liability company ("TCT"), to the
Amended and  Restated  Agreement  and Plan of Merger,  dated as of December  18,
1998, by and among ATC, ATI, ATMC and TCT.

                              W I T N E S S E T H:

         WHEREAS,  ATC,  ATI and TCT are  parties  to an  Amended  and  Restated
Agreement  and Plan of  Merger,  dated as of  December  18,  1998  (the  "Merger
Agreement"), providing for the merger of ATMC with and into TCT on the terms and
conditions set forth therein; and

         WHEREAS, ATC, ATI, ATMC and TCT desire to amend the Merger Agreement in
certain respects; and

         WHEREAS,  the  Boards  of  Directors  of  ATC,  ATI  and  ATMC  and the
Management  Committee of TCT and the TCT Members have heretofore  authorized the
officers of such companies to enter into amendments to the Merger Agreement;

         NOW,   THEREFORE,   in   consideration   of  the   premises   and   the
representations, warranties, covenants and agreements herein contained and other
valuable   consideration,   the   receipt  and   adequacy   whereof  are  hereby
acknowledged,  the  parties  hereto  hereby,  intending  to  be  legally  bound,
represent, warrant, covenant and agree as follows:

1.       DEFINED TERMS

         As used  herein,  unless  the  context  otherwise  requires,  the terms
defined  in  Appendix  A to the  Merger  Agreement  when used in this  Amendment
without definition shall have the respective  meanings set forth therein.  Terms
defined in the singular shall have a comparable meaning when used in the plural,
and vice versa,  and the  reference to any gender shall be deemed to include all
genders.  Unless otherwise  defined or the context  otherwise  clearly requires,
terms for which  meanings  are  provided in this  Amendment or Appendix A to the
Merger Agreement shall have such meanings when used in each Collateral  Document
executed  or required to be  executed  pursuant  hereto or thereto or  otherwise
delivered,  from  time to  time,  pursuant  hereto  or  thereto.  References  to
"hereof," "herein" or similar terms are intended to refer to this Amendment as a
whole and not a particular  section,  and  references to "this Section" or "this
Article"  are  intended  to refer to the entire  section  or  article  and not a
particular subsection thereof. The term "either party" shall, unless the context
otherwise requires, refer to ATC, ATI and ATMC, on the one hand, and TCT, on the
other hand.

2.       THE AMENDMENTS

                  (a)  Conversion  of TCT  Units.  Section  3.1  of  the  Merger
         Agreement shall be amended as follows:

                           (i)  The  title  shall  be  amended  to  read  in its
                  entirety as follows:  "Conversion of ATMC Common Stock and TCT
                  Units";

                           (ii) The last sentence of the first  paragraph  shall
                  be amended to delete the last word,  "paragraph" and insert in
                  its place the words "two paragraphs"; and

<PAGE>
                           (iii) The following  paragraph  shall be added as the
                  penultimate paragraph of Section 3.1:

                                    In the event the Monthly  Tower  Revenue Run
                           Rate of TCT for the month ended  immediately prior to
                           the  Closing  Date  shall have been less than the TCT
                           Target  Monthly Tower Revenue Run Rate, the ATC Stock
                           Consideration  shall be reduced by a number of shares
                           of ATC Common Stock  determined  as follows:  (i) the
                           difference  between the actual  Monthly Tower Revenue
                           Run  Rate of TCT and the  TCT  Target  Monthly  Tower
                           Revenue Run Rate shall be  determined  (the  "Revenue
                           Shortfall");  (ii)  the  Revenue  Shortfall  shall be
                           multiplied  by twelve  (12),  and the result shall be
                           multiplied by fourteen and  eight-tenths  (14.8) (the
                           "Enterprise   Value   Shortfall");   and   (iii)  the
                           Enterprise  Value  Shortfall  shall be divided by the
                           Closing Date Share Price; provided,  however, that in
                           no event  shall the  number  of shares of ATC  Common
                           Stock  to be  delivered  as  part  of the  ATC  Stock
                           Consideration  be reduced by more than 600,000 shares
                           of ATC Common  Stock.  The term "TCT  Target  Monthly
                           Tower  Revenue  Run Rate"  shall  mean the amount set
                           forth  opposite the month in which the Closing  shall
                           occur:

                               Month in which                  TCT Target
                               Closing Occurs               Revenue Run Rate
                               --------------               ----------------

                                     January                    $1,008,179
                                     February                   $1,022,862
                                     March                      $1,037,544
                                     April                      $1,052,226
                                     May                        $1,067,132
                                     June                       $1,079,143
                                     July and thereafter        $1,091,378

                           In the event that the Closing  shall occur after June
                           1999, the Monthly Tower Revenue Run Rate of TCT shall
                           be determined exclusively on the basis of its Monthly
                           Tower  Revenue Run Rate as of June 30,  1999,  and no
                           adjustment  to the ATC Stock  Consideration  shall be
                           made under this  Section 3.1 on account of the amount
                           of TCT's  Monthly Tower Revenue Run Rate as of a date
                           later than June 30, 1999.

                           Anything   in   this    Section   to   the   contrary
                           notwithstanding,  the parties shall have the right to
                           terminate  this  Agreement  in  accordance  with  the
                           provisions of Section 8.1(b) and Section  8.1(c),  as
                           applicable.

                  (b)  Conditions to Obligations of ATC and ATMC. The provisions
         of Section  7.2(o) are deleted in their  entirety and the section shall
         be designated with the term "Intentionally Omitted".

                  (c)  Appendix  A.  Appendix A is amended to add the  following
         definitions in their appropriate alphabetical order:

                           Enterprise  Value  Shortfall  shall have the  meaning
                  given to it in Section 3.1.

                           Revenue  Shortfall shall have the meaning given to it
                  in Section 3.1.

                           TCT Target  Monthly Tower Revenue Run Rate shall have
                  the meaning given to it in Section 3.1.

                                        2

<PAGE>

                  (d) TCT Disclosure  Schedule.  Sections 4.11(a) and 6.6 of the
         TCT Disclosure Schedule shall be deemed to have been amended to reflect
         the fact that TCT may  change  its stay  bonus  program  to award up to
         $500,000  exclusively  to sales persons in relation to their  obtaining
         additional revenue-generating leases and contracts.


3.       GENERAL PROVISIONS

                  (a)  No  Other   Changes  in  Merger   Agreement.   Except  as
         specifically  amended by this  Amendment,  the Merger  Agreement  shall
         remain in full  force and effect and shall not  otherwise  be  amended,
         modified or changed by this Amendment.

                  (b)  Incorporation  by Reference.  The  provisions of Sections
         10.1 through 10.13,  both inclusive,  of the Merger  Agreement shall be
         deemed  incorporated herein by reference with the same force and effect
         as though set forth hereat in their entirety, except that any reference
         to the term "this Agreement" in any such  incorporated  provision shall
         be deemed to refer to this Amendment.


                            [SIGNATURE PAGE FOLLOWS]


                                        3

<PAGE>


         IN WITNESS WHEREOF,  the parties have executed this Amendment or caused
this  Amendment  to be  executed by their  respective  officers  thereunto  duly
authorized as of the date first written above.

                                   American Tower Corporation


                                   By:  ____________________________________
                                           Name:
                                           Title:



                                   ATC Merger Corporation


                                   By:  ____________________________________
                                           Name:
                                           Title:


                                   American Towers, Inc.


                                   By:______________________________________
                                         Name:
                                         Title:


                                   TeleCom Towers, L.L.C.


                                   By:______________________________________
                                        Name:
                                        Title:




                                        4


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