AMERICAN TOWER CORP /MA/
S-4/A, 2000-08-04
COMMUNICATIONS SERVICES, NEC
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     As filed with the Securities and Exchange Commission on August 4, 2000
                                                  Registration No. 333-39030

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                 AMENDMENT NO. 1
                                       To
                                    FORM S-4
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

         Delaware                        4899                     65-0723837
(State or other jurisdiction      (Primary Standard            (I.R.S. Employer
   of incorporation or           Industrial jurisdiction     Identification No.)
       organization)            Classification Code Number)

               116 Huntington Avenue, Boston, Massachusetts 02116
  (Address,  including zip code, and telephone  number,  including area code, of
                   registrant's principal executive offices)

                                 STEVEN B. DODGE
                           American Tower Corporation
                              116 Huntington Avenue
                           Boston, Massachusetts 02116
                                 (617) 375-7500
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                    Copy to:
                             NORMAN A. BIKALES, ESQ.
                            Sullivan & Worcester LLP
                             One Post Office Square
                           Boston, Massachusetts 02109
                                 (617) 338-2800

   Approximate date of commencement of proposed sale to the public: From time to
time after the effective  date of this  registration  statement as determined in
light of market conditions and other factors.
     If the  securities  being  registered  on this  form are being  offered  in
connection  with the formation of a holding company and there is compliance with
General Instruction G, check the following box.  / /
     If this Form is filed to  register  additional  securities  for an offering
pursuant to Rule 462(b) under the  Securities  Act,  check the following box and
list the Securities Act registration  statement number of the earlier  effective
registration statement for the same offering. / /
     If this Form is a  post-effective  amendment  filed pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering.  / /
<PAGE>

THE PROSPECTUS CONTAINED HEREIN IS A COMBINED PROSPECTUS PURSUANT TO RULE 429(A)
OF THE RULES AND REGULATIONS UNDER THE SECURITIES ACT OF 1933, AS AMENDED, WHICH
ALSO  RELATES TO (I) $300 MILLION  AGGREGATE  ORIGINAL  PRINCIPAL  AMOUNT OF THE
COMPANY'S 6.25%  CONVERTIBLE NOTES DUE 2009 AND THE 12,295,081 SHARES OF CLASS A
COMMON  STOCK  ISSUABLE  UPON  CONVERSION  THEREOF  INCLUDED  IN  THE  COMPANY'S
REGISTRATION  STATEMENT ON FORM S-3 (FILE NO.  333-89345),  (II) $425.5  MILLION
AGGREGATE ORIGINAL PRINCIPAL AMOUNT OF THE COMPANY'S 2.25% CONVERTIBLE NOTES DUE
2009 AND THE 12,502,609  SHARES OF CLASS A COMMON STOCK ISSUABLE UPON CONVERSION
THEREOF INCLUDED IN THE COMPANY'S  REGISTRATION  STATEMENT ON FORM S-3 (FILE NO.
333-89345),  AND (III) $450 MILLION AGGREGATE  ORIGINAL  PRINCIPAL AMOUNT OF THE
COMPANY'S 5.0%  CONVERTIBLE  NOTES DUE 2010 AND THE 8,737,864  SHARES OF CLASS A
COMMON  STOCK  ISSUABLE  UPON  CONVERSION  THEREOF  INCLUDED  IN  THE  COMPANY'S
REGISTRATION STATEMENT ON FORM S-3 (FILE NO. 333-35412).

                                 --------------

     The Registrant  hereby amends this  Registration  Statement on such date or
dates as may be necessary to delay its effective date until the Registrant shall
file a further  amendment  which  specifically  states  that  this  Registration
Statement shall  thereafter  become effective in accordance with Section 8(a) of
the Securities  Act of 1933 or until this  Registration  Statement  shall become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.




<PAGE>
We will amend and complete the information in this  prospectus.  Although we are
permitted by U.S.  federal  securities laws to offer these securities using this
prospectus,  we may not sell them or  accept  your  offer to buy them  until the
documentation  filed with the SEC relating to these securities has been declared
effective by the SEC. This  prospectus is not an offer to sell these  securities
or our  solicitation of your offer to buy these  securities in any  jurisdiction
where that would not be permitted or legal.

                   SUBJECT TO COMPLETION, DATED AUGUST 4, 2000

                                   PROSPECTUS

                                     [LOGO]
<TABLE>
<CAPTION>
<S>                          <C>                          <C>                          <C>

      $212,742,000                 $352,396,000                 $450,000,000               2,000,000 Shares
 6.25% Convertible Notes      2.25% Convertible Notes      5.00% Convertible Notes       Class A Common Stock
        Due 2009                     Due 2009                     Due 2010                  $.01 par value
</TABLE>

         This prospectus relates to:

     o    $212,742,000 principal amount of 6.25% convertible notes due 2009,

     o    $352,396,000  principal amount at maturity of 2.25%  convertible notes
          due 2009,

     o    $450,000,000 principal amount of 5.00% convertible notes due 2010,

     o    the 27,811,365 shares of Class A common stock currently  issuable upon
          conversion or exchange of the notes, plus an additional  indeterminate
          number of shares that may become issuable upon conversion of the notes
          due to adjustment of the conversion price, and

     o    up to  2,000,000  shares of Class A common stock that may be issued to
          certain  note  holders to induce  them to convert  or  exchange  their
          notes.

         The notes and the Class A common  stock are offered for resale by their
holders.  The notes were initially acquired from us in October 1999 and February
2000 in connection  with two private  offerings by groups of investment  banking
firms who resold the notes pursuant to Rule 144A.

         You may  convert  the 6.25%  notes at any time prior to  maturity  into
shares of our Class A common stock at a conversion  price of $24.40 per share of
Class A common stock.  This means that we will deliver 40.9836 shares of Class A
common stock for each $1,000 principal amount of the 6.25% notes you convert. We
will pay  interest  on the 6.25%  notes on April 15 and October 15 of each year,
commencing on April 15, 2000.

         You may  convert  the 2.25%  notes at any time prior to  maturity  into
shares of our Class A common stock at a conversion  price of $24.00 per share of
Class A common stock, based on the issue price of 70.52% of the principal amount
at maturity.  This means that we will deliver  29.3833  shares of Class A common
stock for each  $1,000  principal  amount  at  maturity  of the 2.25%  notes you
convert.  We will pay  interest on the 2.25% notes on April 15 and October 15 of
each year, commencing on April 15, 2000.

         You may  convert  the 5.00%  notes at any time prior to  maturity  into
shares of our Class A common stock at a conversion  price of $51.50 per share of
Class A common stock.  This means that we will deliver 19.4175 shares of Class A
common stock for each $1,000 principal amount of the 5.00% notes you convert. We
will pay  interest on the 5.00% notes on February 15 and August 15 of each year,
commencing on August 15, 2000.

         We may redeem the 6.25%  notes on or after  October 22,  2002.  You may
require us to  repurchase  the 6.25%  notes at a price of $1,000 each on October
22, 2006.  We may redeem the 2.25% notes on or after  October 22, 2003.  You may
require us to  repurchase  the 2.25% notes at a price of $802.93 each on October
22, 2003. We may redeem the 5.00% notes on or after  February 20, 2003.  You may
require us to  repurchase  the 5.00% notes at a price of $1,000 each on February
20,  2007.  In the case of a  repurchase  of  notes,  we have the right to issue
shares of our Class A common stock,  rather than to pay cash.  In addition,  you
may require us to repurchase  the notes of each series upon a change in control.
There is no sinking fund for any of the notes.
<PAGE>

         Our Class A common stock is listed on the New York Stock Exchange under
the symbol  "AMT." The last  reported  sale price of the Class A common stock on
the New York Stock Exchange on August 3, 2000 was $43.4375 per share.

         Investing in the notes involves risks. See "Risk Factors"  beginning on
page 6.

         Neither the Securities and Exchange Commission nor any state securities
commission has approved or  disapproved  of these  securities or passed upon the
adequacy or accuracy of this prospectus. Any representation to the contrary is a
criminal offense.

                The date of this Prospectus is           , 2000.


<PAGE>
<TABLE>
<CAPTION>

                                                  TABLE OF CONTENTS
<S>                                                   <C>                                                       <C>

Summary..........................................1     Selling Securityholders...................................30
Risk Factors.....................................6     Certain Federal Income Tax Consequences...................36
Selected Financial Data.........................10     Plan of Distribution......................................45
Use of Proceeds.................................13     Legal Matters.............................................46
Certain Exchange Transactions...................14     Experts...................................................47
Description of the Notes........................15     About This Prospectus.....................................47
Description of Certain Indebtedness.............25     Where You Can Find More Information.......................47
Description of Capital Stock....................27     Cautionary Note Regarding Forward-Looking Statements......48

</TABLE>

------------------------------------------------------------------------------

         You should rely only on the  information  contained or  incorporated by
reference in this prospectus.  We have not authorized anyone to provide you with
any different information. You may use this prospectus only where it is legal to
sell these  securities.  The information in this prospectus may only be accurate
on the date of this prospectus.


                                       -i-



<PAGE>

                                     SUMMARY

         This summary highlights selected  information about us. You should read
this entire prospectus carefully, including the "Risk Factors" section beginning
on page 6 and the financial  statements,  which are  incorporated  by reference
from our 1999 Annual  Report on Form 10-K,  our  Quarterly  Reports on Form 10-Q
dated May 17, 1999 and May 15, 2000, and our Current  Reports on Form 8-K, dated
March 30, 2000 and May 15, 2000.


                                 AMERICAN TOWER

         We are a wireless  communications and broadcast  infrastructure company
operating in three business segments.

         o        We operate a leading network of communications  towers and are
                  the largest independent  operator of broadcast towers in North
                  America.  Giving  effect  as of  June 1,  2000 to our  pending
                  transactions, we have approximately 10,000 multi-user sites in
                  the United States, Mexico and Canada,  including approximately
                  300 broadcast tower sites.

         o        We provide  comprehensive  network  development  services  and
                  components for wireless service providers and broadcasters. We
                  offer  full  turnkey  network  development  solutions  to  our
                  customers, consisting of radio frequency engineering,  network
                  design,   site   acquisition,   zoning  and  other  regulatory
                  approvals,  construction  management,  tower  construction and
                  antenna  installation.  We  also  offer  a  complete  line  of
                  wireless  infrastructure  components and fabricate  steel used
                  for broadcast towers and other structures.

         o        We  are a  leading  provider  of  domestic  and  international
                  satellite and Internet protocol network transmission  services
                  worldwide. We own and operate more than 160 antennas accessing
                  most major satellite systems from U.S.  teleport  locations in
                  Arizona,   California,   Massachusetts,   New  Jersey,  Texas,
                  Washington state and Washington, D.C.

         We  estimate  that  our  three  business  segments  accounted  for  the
following percentages of pro forma 1999 operating revenues:

         o        Rental and management--53.0%,

         o        Network development services--27.0%, and

         o        Satellite   and   Internet   protocol   network   transmission
                  services--20.0%.

<PAGE>
                                  THE OFFERINGS

                                    The Notes

Notes offered.................   The selling  securityholders  may from time to
                                 time offer the following  notes:  $212,742,000
                                 principal  amount of 6.25%  Convertible  Notes
                                 Due  2009,  $352,396,000  principal  amount at
                                 maturity of 2.25%  Convertible Notes Due 2009,
                                 and  $450,000,000  principal  amount  of  5.0%
                                 Convertible Notes Due 2010.

Issue price...................   100% plus accrued  interest,  if any, from the
                                 date of issue in the case of the  6.25%  notes
                                 and  the  5.0%  notes.   70.52%  plus  accrued
                                 interest,  if any,  from  the date of issue in
                                 the case of the 2.25% notes.

Interest......................   6.25% notes:  6.25% per annum on the principal
                                 amount,  payable  semiannually  in  arrears in
                                 cash on April 15 and  October 15 of each year,
                                 beginning April 15, 2000.

                                 2.25% notes:  2.25% per annum on the  principal
                                 amount, payable semiannually in arrears in cash
                                 on  April  15  and  October  15 of  each  year,
                                 beginning April 15, 2000.

                                 5.00% notes:  5.00% per annum on the  principal
                                 amount, payable semiannually in arrears in cash
                                 on  February  15 and  August  15 of each  year,
                                 beginning August 15, 2000.

Yield to maturity.............   6.25% notes:  6.25% per annum  calculated on a
                                 semiannual basis from October 4, 1999.

                                 2.25% notes:  6.25% per annum,  calculated on a
                                 semiannual  basis giving effect both to accrued
                                 original issue discount and to accrued interest
                                 from October 4, 1999.

                                 5.00% notes:  5.00% per annum  calculated on a
                                 semiannual basis from February 15, 2000.

Conversion rights.............   6.25% notes:  You may convert the 6.25% notes,
                                 unless we have redeemed or purchased  them, at
                                 any time on or before  October 15,  2009.  The
                                 6.25%  notes are  convertible  into  shares of
                                 Class A common stock at a conversion  price of
                                 $24.40  per  share.  We will  deliver  40.9836
                                 shares of Class A common stock for each $1,000
                                 principal   amount   of  6.25%   notes.   Upon
                                 conversion  you  will  not  receive  any  cash
                                 payment representing accrued interest.

                                 2.25%  notes:  You may convert the 2.25% notes,
                                 unless we have  redeemed or purchased  them, at
                                 any time on or before  October  15,  2009.  The
                                 2.25%  notes  are  convertible  into  shares of
                                 Class A common stock at a  conversion  price of
                                 $24.00  per  share.  We  will  deliver  29.3833
                                 shares of Class A common  stock for each $1,000
                                 principal amount at maturity of 2.25% notes. We
                                 will not adjust the conversion rate for accrued
                                 original  issue  discount  or  interest.   Upon
                                 conversion,  you  will  not  receive  any  cash
                                 payment  representing  accrued  original  issue
                                 discount or interest.

                                 5.00%  notes:  You may convert the 5.00% notes,
                                 unless we have  redeemed or purchased  them, at
                                 any time on or before  February 15,  2010.  The
                                 5.00%  notes  are  convertible  into  shares of
                                 Class A common stock at a  conversion  price of
                                 $51.50  per  share.  We  will  deliver  19.4175
                                 shares of Class A common  stock for each $1,000
                                 principal   amount   of   5.00%   notes.   Upon
                                 conversion   you  will  not  receive  any  cash
                                 payment representing accrued interest.

                                      -2-
<PAGE>
                                 The  conversion  rate of all  three  series  of
                                 notes  is  subject  to  adjustment  in  certain
                                 events.

Maturity date.................   October  15,  2009 in the  case  of the  6.25%
                                 notes and the 2.25%  notes,  and  February 15,
                                 2010 in the case of the 5.00% notes.

Change in control.............   If a change in control of our company  occurs,
                                 you may require us to purchase  your notes for
                                 cash at a price equal to the principal amount,
                                 in the  case  of the  6.25%  notes  and  5.00%
                                 notes,   and  the  issue  price  plus  accrued
                                 original  issue  discount  in the  case of the
                                 2.25%  notes.  In each  case  we will  also be
                                 required to pay  accrued and unpaid  interest.
                                 Our existing credit facilities restrict making
                                 these  change  in  control   payments  without
                                 lender consent.

Optional redemption...........   6.25% notes: We will not be able to redeem the
                                 6.25%  notes   prior  to  October  22,   2002.
                                 Thereafter,  we can redeem those notes, at our
                                 option,  in whole  or in part at a  redemption
                                 price  initially of 103.125% of the  principal
                                 amount.  The redemption price declines ratably
                                 immediately after October 15 of each following
                                 year to 100% of the principal amount in 2005.

                                 2.25% notes:  We will not be able to redeem the
                                 2.25%  notes   prior  to  October   22,   2003.
                                 Thereafter,  we can redeem those notes,  at our
                                 option,  in  whole  or in  part  at  increasing
                                 redemption   prices  designed  to  reflect  the
                                 accrued original issue discount.

                                 5.00% notes:  We will not be able to redeem the
                                 5.00%  notes  prior  to  February   20,   2003.
                                 Thereafter,  we can redeem those notes,  at our
                                 option,  in  whole  or in part at a  redemption
                                 price  initially  of 102.50%  of the  principal
                                 amount.  The redemption  price declines ratably
                                 immediately after February 15 of each following
                                 year to 100% of the principal amount in 2006.

                                 In  each  case  we  are  also  required  to pay
                                 accrued and unpaid interest upon redemption.
Repurchase of notes at your
option........................   6.25% notes:  You may require us to repurchase
                                 all or any of your 6.25%  notes on October 22,
                                 2006 at their principal amount,  together with
                                 accrued and unpaid interest.

                                 2.25% notes:  You may require us to  repurchase
                                 all or any of your 2.25%  notes on October  22,
                                 2003 at $802.93,  which is its issue price plus
                                 accrued original issue discount,  together with
                                 accrued and unpaid interest.

                                 5.00% notes:  You may require us to  repurchase
                                 all or any of your notes on  February  20, 2007
                                 at  their  principal   amount,   together  with
                                 accrued and unpaid interest.

                                 We  may,  at  our  option,  elect  to  pay  the
                                 repurchase  price  of  each  series  in cash or
                                 shares  of  Class  A  common   stock,   or  any
                                 combination   thereof.  Our  credit  facilities
                                 restrict  our ability to  repurchase  the notes
                                 for cash.

Sinking fund..................   None.

                                      -3-
<PAGE>

Original issue discount
on 2.25% notes................   Each 2.25% note was issued with original issue
                                 discount for federal income tax purposes.  The
                                 amount  of  the  discount  is  the  difference
                                 between the principal amount of the 2.25% note
                                 at maturity and its issue price. You should be
                                 aware that  accrued  original  issue  discount
                                 will be includable  periodically in your gross
                                 income for federal income tax purposes  before
                                 conversion,  redemption,  other disposition or
                                 maturity of your 2.25%  notes,  whether or not
                                 those   notes   are   ultimately    converted,
                                 redeemed,  sold  to us or  others  or  paid at
                                 maturity.

Ranking.......................   The  notes  of  all  three  series  will  rank
                                 equally  with one  another.  Each  series will
                                 effectively   rank   junior  to   indebtedness
                                 outstanding  under the credit facilities since
                                 that    indebtedness    is   issued   by   our
                                 subsidiaries  and  is  secured,   directly  or
                                 indirectly through  guarantees,  by the assets
                                 of our subsidiaries. That indebtedness is also
                                 guaranteed by us and secured by our assets.

                              Class A Common Stock

Class A common stock offered..   We may from time to time offer up to  2,000,000
                                 additional  shares  of Class A common  stock to
                                 certain  note holders to induce them to convert
                                 or exchange  their  notes.  We would also issue
                                 the  shares  of Class A common  stock  issuable
                                 upon  conversion  in  those  transactions.  The
                                 selling  securityholders  may from time to time
                                 offer these  additional  shares and  conversion
                                 shares for resale.

Voting rights.................   The  Class A  common  stock  and  the  Class B
                                 common stock generally vote as a single class.
                                 Class A common  stock  has one vote per  share
                                 and  Class B common  stock  has ten  votes per
                                 share.  The Class A common stock,  voting as a
                                 separate  class,  is  entitled  to  elect  two
                                 independent directors.  Delaware corporate law
                                 and our charter  also  require  class votes on
                                 some  matters.  Approximately  39.61%  of  the
                                 total  voting power will be owned by Steven B.
                                 Dodge  and  other   executive   officers   and
                                 directors,  together  with  their  affiliates,
                                 after this offering.  The Class C common stock
                                 is generally nonvoting.

Other rights..................   Each class of common stock has the same rights
                                 to  dividends  upon  liquidation.  The Class B
                                 common  stock and the Class C common stock are
                                 convertible  into  Class A  common  stock on a
                                 share-for-share  basis.  The  Class  B  common
                                 stock cannot be sold or transferred, except to
                                 certain categories of persons specified in our
                                 charter.    The    Class   B   common    stock
                                 automatically  converts  into  Class A  common
                                 stock upon the occurrence of certain events.

Resale........................   If you are a broker  or  dealer  who  acquired
                                 notes  as a market  maker or in other  trading
                                 activity, or if you are our affiliate, and you
                                 exchange  those notes for Class A common stock
                                 pursuant to a negotiated  transaction with us,
                                 you will be required  to deliver a  prospectus
                                 in  connection  with the resale of the Class A
                                 common  stock  received in exchange  for those
                                 notes. See "Plan of Distribution" on page 45.

Common stock outstanding(l)...   168,324,408 shares of Class A common stock
                                   8,232,303 shares of Class B common stock
                                   2,267,813 shares of Class C common stock
                                 -----------
                                 178,824,524 shares of common stock
                                 ===========

                                     General

Registration rights...........   We have  agreed  to keep the SEC  registration
                                 statement   that  includes   this   prospectus
                                 useable,  with respect to the 6.25% notes, the
                                 2.25%  notes  and  the  Class A  common  stock
                                 issuable upon their conversion,  until October
                                 4, 2001,  and with

                                      -4-
<PAGE>

                                 respect  to the  5.00%  notes  and the Class A
                                 common stock  issuable upon their  conversion,
                                 until February 15, 2002, or, in each case, any
                                 shorter period  permitted  under the SEC rules
                                 permitting  unregistered  resales of privately
                                 placed securities. If we are not in compliance
                                 with this requirement for any series of notes,
                                 the   interest   rate  on  those   notes  will
                                 increase.

Use of proceeds...............   We will not receive  any of the cash  proceeds
                                 from sales of the notes or the  shares  issued
                                 on  conversion or exchange of the notes by the
                                 selling  securityholders.  In consideration of
                                 the  issuance  of  Class  A  common  stock  in
                                 privately  negotiated  exchange   transactions
                                 with certain note holders, we will receive the
                                 notes  surrendered by those  holders.  The net
                                 proceeds   of   approximately   $1.0   billion
                                 received  from the  initial  sale of the notes
                                 were used to repay bank borrowings, to finance
                                 tower  construction and acquisitions,  and for
                                 general working capital purposes.

Trading.......................   The  notes  are not  listed  and  trade on the
                                 over-the-counter  market.  The  Class A common
                                 stock is listed on the NYSE  under the  symbol
                                 "AMT."



(1)      The number of shares of common stock  outstanding  was determined as of
         July 19, 2000.  This number does not include shares we may issue in the
         future. Examples of these future issuances include: (a) shares of Class
         A common  stock  issuable  upon  conversion  of Class B common stock or
         Class C common  stock,  (b) shares  issuable  upon  exercise of options
         outstanding  on May 1, 2000 to  purchase  an  aggregate  of  16,760,882
         shares of common stock,  (c)  3,000,000  shares of Class A Common Stock
         issuable upon exercise of warrants issued in the AirTouch  transaction,
         (d) shares issuable upon consummation of certain pending  transactions,
         (e) 19,073,490  shares of Class A common stock issuable upon conversion
         of 6.25% notes and 2.25% notes,  (f) 8,737,875 shares of Class A common
         stock  issuable  upon  conversion  of the  5.00%  notes,  and  (g)  the
         2,000,000  shares of Class A common  stock that may be issued to induce
         conversion or exchange of notes.

                                      -5-
<PAGE>
                                  RISK FACTORS

         You  should  consider   carefully  the  following   factors  and  other
information in this prospectus before deciding to invest in our securities.


If we cannot keep raising capital, our growth will be impeded

         Without  additional  capital,  we would need to curtail our acquisition
and  construction  programs  which are essential for our long-term  success.  We
expect to use borrowed funds to satisfy most of our capital needs.  However,  we
must continue to satisfy financial ratios and to comply with financial and other
covenants  in  order  to do so.  If our  revenues  and  cash  flow  do not  meet
expectations,  we may lose our ability to borrow money.  These same factors,  as
well as market  conditions  beyond  our  control,  could  make it  difficult  or
impossible for us to sell securities as an alternative to borrowing.

Failure to meet our large debt payments  could require us to sell  securities or
assets on unfavorable terms

         Our high debt level makes us vulnerable to downturns in our operations.
This high debt level  requires us to use most of our cash flow to make  interest
and principal  payments.  If we do not generate sufficient cash flow through our
operations  to make interest and  principal  payments,  we may be forced to sell
debt or equity  securities  or to sell some of our core  assets.  This  could be
harmful to our business and to our securityholders. Market conditions or our own
financial situation may require us to make these sales on unattractive terms.

Decrease in demand for tower space would  materially  and  adversely  affect our
cash flow and we cannot control that demand

         Many of the factors affecting the demand for tower space, and therefore
our cash flow, are beyond our control. Those factors include:

         o        consumer demand for wireless services,

         o        the  financial  condition of wireless  service  providers  and
                  their preference for owning or leasing antenna sites,

         o        the growth rate of wireless  communications or of a particular
                  wireless segment,

         o        the  number of  wireless  service  providers  in a  particular
                  segment, nationally or locally,

         o        governmental licensing of broadcast rights,

         o        increased  use of roaming and resale  arrangements  by service
                  providers,

         o        zoning, environmental and other government regulations, and

         o        technological changes.

Build-to-suit  construction projects increase our dependence on a limited number
of customers

         Our  increasing  focus on major  build-to-suit  projects  for  wireless
service providers entails several unique risks.  First is our greater dependence
on a limited number of customers.  In addition,  although we have the benefit of
an  anchor  tenant  in  build-to-suit  projects,  we may  not be  able to find a
sufficient  number of additional  tenants.  In

                                      -6-
<PAGE>

fact,  one  reason   wireless   service   providers  may  prefer   build-to-suit
arrangements is to share or escape the costs of an undesirable  site. A site may
be  undesirable  because it has high  construction  costs or may be considered a
poor location by other providers.

Our expanded construction program increases our exposure to uncontrollable risks

         We cannot control the main factors that can prevent,  delay or increase
the cost of construction. These factors include:

         o        zoning and local permitting requirements,

         o        environmental group opposition,

         o        availability   of   skilled    construction    personnel   and
                  construction equipment,

         o        adverse weather conditions, and

         o        federal regulations.

Increasing  competition  poses  problems for our  construction  and  acquisition
programs

         Increased competition,  which we believe will continue, has resulted in
substantially  higher acquisition  costs,  particularly for towers being sold by
wireless service providers.  That competition has also raised  construction site
acquisition  costs and created  shortages  for  experienced  tower  construction
personnel.  Because of personnel shortages, we could experience failures to meet
time  schedules.  Failures  to meet time  schedules  could  result in our paying
significant  penalties to prospective  tenants,  particularly  in  build-to-suit
situations.

Our acquisition strategy involves potential management and integration issues

         The increased size of our acquisitions from wireless service providers,
which often  involve  major  build-to-suit  arrangements,  could create  certain
problems we have not faced in the past. These include:

         o        dependence on a limited number of customers,

         o        lease and control  provisions  more  favorable to the wireless
                  service provider than those we give our tenants generally,

         o        integration  of major national  networks into our  operational
                  systems,

         o        demands  on  managerial  personnel  that  could  divert  their
                  attention from other aspects of our business, and

         o        the acquisition of significant numbers of towers that, because
                  of location or age, may have limited marketing potential.

Covenants in our credit facilities restrict our ability to redeem the notes

         Our credit facilities prohibit us from redeeming or repurchasing any of
the notes for cash.  This will probably  require us to elect to  repurchase  the
notes with Class A common  stock on the  repurchase  dates and to obtain  lender
consent in order to repurchase notes upon any change in control.

                                      -7-
<PAGE>

We are dependent on our chief executive officer and would be hurt if he left

         The loss of our chief executive officer, Steven B. Dodge, has a greater
likelihood  of having a material  adverse  effect  upon us than it would on most
other  companies  of our size.  Our growth  strategy is highly  dependent on the
efforts of Mr.  Dodge.  Our  ability to raise  capital  is also  dependent  to a
significant  extent on the reputation of Mr. Dodge.  You should be aware that we
have not entered into employment agreements with Mr. Dodge.

Expanding operations into foreign countries could create certain operational and
financial risks

         Our recent expansion into Canada and Mexico, and other possible foreign
operations in the future,  could result in adverse  financial  consequences  and
operational  problems  not  experienced  in the  United  States.  We have made a
substantial  loan to a Mexican  company and are committed to construct a sizable
number of towers in that  country.  We have also  invested  in a Canadian  joint
venture that intends to acquire and  construct  towers in that  country.  We may
also, in the future, engage in comparable transactions in other countries. Among
the risks of foreign  operations are governmental  expropriation and regulation,
inability  to  repatriate  earnings  or  other  funds,  currency   fluctuations,
difficulty  in  recruiting   trained   personnel,   and  language  and  cultural
differences that could impair management control and operations.

New technologies could make our tower antenna leasing services less desirable to
potential tenants

         Mobile satellite systems and other new technologies  could compete with
land-based  wireless  communications  systems,  thereby  reducing the demand for
tower lease space and other  services  we  provide.  The Federal  Communications
Commission  has granted  license  applications  for several  low-earth  orbiting
satellite systems that are intended to provide mobile voice or data services. In
addition,   the  emergence  of  new  technologies  could  reduce  the  need  for
tower-based  transmission  and  reception  and  have an  adverse  affect  on our
operations.

         The development and  implementation  of signal combining  technologies,
which permit one antenna to service two different transmission  frequencies and,
thereby,  two  customers,   may  reduce  the  need  for  tower-based   broadcast
transmission  and hence demand for our antenna space.  The growth in delivery of
video services by direct broadcast satellites could also adversely affect demand
for our antenna space.

We  could  be  harmed  if  perceived  health  risks  from  radio  emissions  are
substantiated

         If a connection  between radio  emissions and possible  negative health
effects,  including  cancer,  were  established,  we  would  be  materially  and
adversely affected. We do not maintain any significant insurance with respect to
these matters.

Pro forma  financial  information is based on estimates and  assumptions and may
not be indicative of actual future results

         Our actual future  results  could vary  materially  and adversely  from
those reflected in the pro forma financial  information we have  incorporated by
reference  in this  prospectus.  That  information  is based  upon a  number  of
assumptions  we  believe to be  reasonable.  However,  our two most  significant
acquisitions  to date,  the AirTouch and AT&T  transactions,  do not involve the
acquisition  of  businesses.  The towers  involved  in those  acquisitions  were
operated as part of the wireless  service  divisions of AirTouch and AT&T. Those
companies  did not  maintain  extensive  separate  financial  records or prepare
financial  statements  for the  operation  of those  towers.  We have,  however,
compiled  certain  revenue  and  expense  data of those  towers in the pro forma
information. In the case of certain expenses, we have estimated amounts based on
both  the  limited  information  by the  carriers  and our own  experience  with
comparable towers.  Neither our auditors,  AirTouch's auditors,  AT&T's auditors
nor the initial  purchasers of the notes have  expressed any opinion or provided
any form of  assurance  with respect to  AirTouch's  or AT&T's  historical  data
presented in the unaudited pro forma financial information.

                                      -8-
<PAGE>

The  notes  will  effectively  rank  junior to  secured  debt  under our  credit
facilities

         Our payment of  principal  and  interest on the notes will  effectively
rank junior to all existing and future debt under our credit facilities. This is
so because the debt under our credit  facilities  is issued or guaranteed by our
subsidiaries  and secured by their assets.  The notes will also effectively rank
junior to all other existing and future debt of our  subsidiaries.  We have also
guaranteed  that debt and secured our guaranty  with our assets,  including  the
stock  of our  subsidiaries.  As a  result,  in  the  event  of our  insolvency,
liquidation or reorganization, or should any of that debt be accelerated because
of a default,  we must pay that debt in full  before we can make any  payment on
the notes.

There may not be any trading market for the notes

         No  existing  trading  market  for the notes  exists  and one may never
develop.  Accordingly, you may not be able to sell your notes or sell them at an
acceptable  price. If a market were to develop,  the notes could trade at prices
that may be higher or lower than your purchase price  depending on many factors,
including  prevailing  interest  rates,  the market  price of the Class A common
stock, our operating  results and the market for similar  securities.  We do not
intend to list the notes on any  securities  exchange  or to seek  approval  for
quotation through any automated  quotation system. The initial purchasers of the
notes have advised us that they currently  intend to make a market in the notes.
They are not, however,  obligated to do so and may discontinue  market making at
any  time.  Therefore,  any  liquidity  may  disappear  and the notes may not be
readily marketable.

Control by our  principal  stockholders  could deter mergers where you could get
more than current market price for your stock

         Control by Mr. Dodge and others may have the effect of  discouraging  a
merger or other takeover of our company in which holders of Class A common stock
may be paid a premium for their  shares over  then-current  market  prices.  Mr.
Dodge,  together with a limited number of our directors,  may be able to control
or  block  the  vote on  mergers  and  other  matters  submitted  to the  common
stockholders.

                                      -9-
<PAGE>
                             SELECTED FINANCIAL DATA

         We  have  derived  the  following  selected  financial  data  from  our
historical consolidated financial statements. The selected financial data should
be read in conjunction with those financial statements.  Prior to our separation
from American Radio on June 4, 1998, we operated as its subsidiary and not as an
independent public company. Therefore, our results of operations for that period
may be  different  from what they would have been had we operated as a separate,
independent company. The information is not necessarily indicative of our future
results of operations or financial condition.

         Year-to-year comparisons are significantly affected by our acquisitions
and construction of towers,  both of which have been numerous during the periods
presented.  See our  historical  financial  statements  for a description of our
principal acquisitions.

         We use certain terms as follows:

         o        divisional  cash flow  means  income  (loss)  from  operations
                  before   depreciation  and   amortization,   tower  separation
                  expense,   development   expense  and  corporate  general  and
                  administrative expense, plus interest income, TV Azteca, net,

         o        development  expense  means the costs  incurred in  connection
                  with the  integration of  acquisitions  and development of new
                  business initiatives,

         o        tower separation  expense means the one-time expenses incurred
                  as a result of our separation from American Radio,

         o        EBITDA means income (loss) from operations before depreciation
                  and amortization and tower separation  expense,  plus interest
                  income, TV Azteca, net, and

o after-tax  cash flow means income (loss)  before  extraordinary  losses,  plus
depreciation and amortization.

         We do not consider divisional cash flow, EBITDA and after-tax cash flow
to be  substitutes  for other  measures of  operating  results or cash flow from
operating  activities or as measures of our  profitability  or liquidity.  These
measures of performance are not calculated in accordance with generally accepted
accounting principles. However, we have included them because they are generally
used in the communications  site industry as a measure of a company's  operating
performance.  More specifically, we believe they can assist in comparing company
performances  on  a  consistent   basis  without  regard  to  depreciation   and
amortization.  Our  concern  is that  depreciation  and  amortization  can  vary
significantly  among  companies  depending on accounting  methods,  particularly
where  acquisitions  are  involved,   or  on  non-operating   factors  including
historical  cost bases.  We believe  divisional  cash flow is useful  because it
enables  you to  compare  divisional  performances  before  the  effect of tower
separation,  development, and corporate general and administrative expenses that
do not relate directly to performance.

                                      -10-
<PAGE>
<TABLE>
<CAPTION>
                             Selected Financial Data

                                                                                          July 17, 1995     Three Months
                                                            Year ended                       through            Ended
                                                           December 31,                   December 31,        March 31,
                                         ----------------------------------------------   -------------     ------------
                                           1999         1998        1997         1996        1995(1)      2000        1999
                                         ---------   ----------   ---------    --------     --------    ---------   ---------
                                                                (in thousands, except per share data)
<S>                                      <C>         <C>          <C>          <C>          <C>         <C>         <C>
Statements of Operations Data:
Operating revenues.......................$ 258,081   $  103,544   $  17,508    $  2,897     $    163    $ 115,517   $  42,408
                                         ---------   ----------   ---------    --------     --------    ---------   ---------
Operating expenses:
    Operating expenses excluding
      depreciation and amortization,
      tower separation, development and
      corporate general and
      administrative expenses............  155,857       61,751       8,713       1,362           60       79,708      24,961
    Depreciation and amortization........  132,539       52,064       6,326         990           57       55,198      24,669
    Tower separation expense.............                12,772
    Development expense(2)...............    1,607                                                            988         267
    Corporate general and administrative
      expense............................    9,136        5,099       1,536         830          230        3,431       1,782
                                         ---------   ----------   ---------    --------     --------    ---------   ---------
      Total operating expenses...........  299,139      131,686      16,575       3,182          347      139,325      51,679
                                         ---------   ----------   ---------    --------     --------    ---------   ---------

(Loss) income from operations............  (41,058)     (28,142)        933        (285)        (184)     (23,808)     (9,271)
Interest expense.........................  (27,492)     (23,229)     (3,040)                              (32,150)     (6,001)
Interest income and other, net...........   19,551        9,217         251          36                     2,586       4,949
Interest income, TV Azteca net of
interest expense of $160 (related party)                                                                    2,308
Minority interest in net earnings of
  subsidiaries(3)........................     (142)        (287)       (193)       (185)                      (36)         (3)
                                         ---------   ----------   ---------    --------     --------    ---------   ---------
Loss before income taxes and
  extraordinary losses...................  (49,141)     (42,441)     (2,049)       (434)        (184)     (51,100)    (10,326)
Benefit (provision) for income taxes.....     (214)       4,491         473         (45)          74       13,440         826
                                         ---------   ----------   ---------    --------      -------    ---------   ---------

Loss before extraordinary losses.........$ (49,355)   $ (37,950)  $  (1,576)    $  (479)    $   (110)   $ (37,660)  $  (9,500)
                                         =========   =========-   =========    ========     ========    =========   =========
Basic and diluted loss per common share
  before extraordinary losses(4)......... $  (0.33)   $   (0.48)  $   (0.03)   $  (0.01)    $  (0.00)   $   (0.24)  $   (0.07)
                                         =========   =========-   =========    ========     ========    =========   =========
Basic and diluted weighted average common
  shares outstanding(4)..................  149,749       79,786      48,732      48,732       48,732      156,515     131,269
                                         =========   =========-   =========    ========     ========    =========   =========
Other Operating Data:
Ratio of earnings to fixed charges(5)...
Tower cash flow......................... $ 102,224    $  41,793    $  8,795    $  1,535      $   103    $  38,117   $  17,447
EBITDA .................................    91,481       36,694       7,259         705         (127)      33,698      15,398
EBITDA margin...........................      35.4%        35.4%       41.5%       24.3%        (N/A)        28.6%       36.3%
After-tax cash flow.....................    83,184       14,114       4,750         511          (53)      17,538      15,169
Cash provided by (used for) operating
  activities............................    97,011       18,429       9,913       2,230          (51)     (12,429)      8,568
Cash used for investing activities......(1,137,700)    (350,377)   (216,783)                             (900,242)   (156,153)
Cash provided by financing activities...   879,726      513,527     209,092         132           63    1,028,192     444,673

Balance Sheet Data:
Cash and cash equivalents................$  25,212   $  186,175   $   4,596    $  2,373      $    12  $   140,733   $ 483,263
Working capital (deficiency), excluding
   current portion of long-term debt.....   19,156       93,602      (2,208)        663          (40)     129,814     476,019
Property and equipment, net..............1,092,346      449,476     117,618      19,710        3,759    1,668,854     642,638
Total assets.............................3,018,866    1,502,343     255,357      37,118        3,863    4,255,140   2,528,537
Long-term debt, including current portion  740,822      281,129      90,176       4,535                 1,883,607     287,871
Total stockholders' equity...............2,145,083    1,091,746     153,208      29,728        3,769    2,176,423   2,162,576
<FN>
(1)  We were organized on July 17, 1995.
(2)  Development expenses prior to 1999 were immaterial.
(3)  Represents the minority interest in net earnings of our non-wholly-owned subsidiaries.
(4)  Basic and diluted loss per common share before  extraordinary  losses have been computed  using the weighted  average number of
     shares outstanding  during each period presented.  Shares  outstanding  following  consummation of our separation from American
     Radio are assumed to be outstanding  for all periods prior to June 4, 1998.  Shares issuable upon exercise of options and other
     common stock equivalents have been excluded from the computations as the effect is anti-dilutive.
(5)  For  purposes of  calculating  this ratio,  earnings  consist of loss before  income taxes and  extraordinary  losses and fixed
     charges.  Fixed charges consist of capitalized interest,  interest expense,  amortization of debt discount and

                                                                -11-
<PAGE>

     related issuance costs and the component of rental expense that management believes to be representative of the interest factor
     on that expense.  For the year ended December 31, 1998 interest expense included  redeemable  preferred stock dividends of $3.1
     million. For each of the periods listed below, our ratio of earnings to fixed charges was less that 1:1. We had a deficiency in
     earnings to fixed  charges in each period as follows  (in  thousands):  1995--$184;  1996--$434;  1997--$2,507;  1998--$43,844;
     1999--$52,520, and for the three months ended March 31, 2000--$53,595.
</FN>
</TABLE>

                                      -12-
<PAGE>



                                USE OF PROCEEDS

         We will not receive any of the cash proceeds from sales of the notes or
the  shares  issued  on  conversion  or  exchange  of the  notes by the  selling
securityholders.  In  consideration  of the  issuance of Class A common stock in
privately  negotiated  exchange  transactions with certain note holders, we will
receive  the  notes   surrendered  by  those   holders.   The  net  proceeds  of
approximately $1.0 billion received from the initial sale of the notes were used
to repay bank borrowings,  to finance tower  construction and acquisitions,  and
for general working capital purposes.


                                      -13-
<PAGE>

                          CERTAIN EXCHANGE TRANSACTIONS

         Under certain market  conditions,  we may determine that  conversion or
exchange of all or some portion of the notes into shares of Class A common stock
would provide us with a more favorable capital structure. It would, for example,
reduce the amount of our debt and interest  expense.  Under those  conditions we
may negotiate private  transactions with individual note holders to provide them
with  incentive to convert or exchange  their notes for shares of Class A common
stock.  This prospectus  includes  2,000,000  shares of our Class A common stock
which,  in  addition  to the  shares  issuable  upon  conversion,  may be issued
pursuant to those transactions.



                                      -14-
<PAGE>

                            DESCRIPTION OF THE NOTES

         The notes have been issued under three separate indentures, dated as of
October 4, 1999 in the case of the 6.25% notes and 2.25% notes,  and dated as of
February 15, 2000 in the case of the 5.00% notes, between us and The Bank of New
York,  as trustee.  We have filed a copy of each  indenture as an exhibit to the
registration  statement of which this prospectus is a part.  Wherever particular
provisions of an indenture are referred to, we incorporate  those  provisions by
reference as a part of the  statements  made. We qualify the statements in their
entirety by that  reference.  We use certain terms defined in the  indentures in
this section without definitions.

General

         The notes represent our unsecured general obligations  convertible into
Class A common stock as described under "Conversion." The currently  outstanding
principal amount of the 6.25% notes is $212,742,000.  The currently  outstanding
principal amount of the 2.25% notes at maturity is  $352,396,000.  The currently
outstanding  principal amount of the 5.00% notes is $450,000,000.  Notes of each
series may be in fully  registered form only in  denominations  of $1,000 or any
multiple thereof.  Unless we redeem them or you convert them earlier,  the 6.25%
notes and 2.25% notes  mature on October 15, 2009 and the 5.00% notes  mature on
February 15, 2010.

         The  indentures  do not  contain  any  restrictions  on the  payment of
dividends,  the incurrence of debt or the repurchase of our equity securities or
any financial covenants.

         The notes bear interest at the respective annual rates set forth on the
cover page of this prospectus from their issue date. Interest on the 6.25% notes
and 2.25% notes is payable semiannually on April 15 and October 15 of each year,
commencing  on April 15, 2000,  to holders of record at the close of business on
the preceding  March 31 and September 30. Interest on the 5.00% notes is payable
semiannually on February 15 and August 15 of each year, commencing on August 15,
2000, to holders of record at the close of business on the preceding  January 31
and July 31. We may pay interest by mailing a check to note holders.

         We will make payment of principal and any premium,  and you may present
the notes for conversion, registration of transfer and exchange, without service
charge, at the office of our paying agent,  initially the trustee,  in New York,
and at the corporate trust office of the trustee in New York.

         The 2.25%  notes  were  issued at 70.52% of their  principal  amount at
maturity.  The federal  income tax  consequences  of this discount are discussed
under  "Certain  Federal  Income  Tax  Consequences-Tax  Consequences  for  U.S.
Holders-Original  Issue Discount on the 2.25% Notes" on page 37.  Original issue
discount  means the  difference  between  the issue price of the 2.25% notes and
their principal  amount at maturity.  The calculation of the accrual of original
issue discount in the period during which a 2.25% note remains  outstanding will
be on a semiannual  bond  equivalent  basis,  using a 360-day  year  composed of
twelve 30-day  months.  The accrual began on October 4, 1999,  the first date of
issuance of 2.25% notes.

Conversion

         You will be entitled to convert your notes, in  denominations of $1,000
principal amount at maturity or multiples  thereof,  at any time, into shares of
Class A common stock. You determine the number of shares of Class A common stock
issuable upon  conversion  by dividing the issue price of the notes  surrendered
for conversion by the  conversion  price.  The conversion  price is shown on the
cover of this prospectus.

         Upon conversion,  you will not be entitled to any payment or adjustment
on account of accrued and unpaid  interest on notes.  Our delivery to you of the
fixed  number  of  shares  of  Class A  common  stock  into  which  the  note is
convertible,  together with cash in lieu of any fractional share, will be deemed
to satisfy our obligation to pay principal and accrued  interest on the notes to
the date of  conversion.  Accrued  interest  is deemed to be paid in full rather
than canceled, extinguished or forfeited.

         If you  surrender  notes for  conversion  during the  period  after any
interest record date and prior to the  corresponding  interest payment date, you
must pay us the interest  payable on those  notes,  unless they have been

                                      -15-
<PAGE>

called for  redemption  on a  redemption  date within the period on the interest
payment date. You may not convert notes called for redemption after the close of
business on the business day preceding the date fixed for redemption,  unless we
default in payment of the redemption  price. We will not issue fractional shares
of Class A common  stock on a  conversion.  Rather,  we will pay the  converting
holder cash equal to the fair market value of the  fractional  interest,  unless
payment in cash is  prohibited by our  indebtedness.  In that case we will issue
fractional shares.

         With respect to the notes that are no longer  restricted  securities on
the  conversion  date,  shares of Class A common stock issued on  conversion  of
notes will be freely transferable  without restriction under the Securities Act,
other than by our  affiliates.  Those  shares  will be  eligible  for receipt in
global form through the facilities of the depositary.

         The  initial  conversion  price  per  share of Class A common  stock is
subject to adjustment in certain  events,  including  upon the  occurrence of an
adjustment event. We use the term adjustment event to mean the following:

         o        the  issuance  of  Class  A  common  stock  as a  dividend  or
                  distribution on Class A common stock,

         o        certain  subdivisions  and  combinations of the Class A common
                  stock,

         o        the issuance to all holders of Class A common stock of certain
                  rights or warrants to purchase Class A common stock, and

         o        the  distribution  to all  holders of Class A common  stock of
                  shares of our capital stock,  other than Class A common stock,
                  evidences  of our  indebtedness  or  other  assets,  including
                  securities.  Excluded from the foregoing are shares of Class A
                  common stock and rights, warrants, dividends and distributions
                  referred  to  above  and   dividends  and   distributions   in
                  connection with our liquidation or paid in cash.

To the extent permitted by law, we may reduce the conversion price by any amount
for any period of at least 20 days if our board of directors determines that the
reduction  would be in our best  interests.  We may also  reduce the  conversion
price as our board of directors  deems advisable to avoid or diminish any income
tax to  holders  of  Class  A  common  stock  resulting  from  any  dividend  or
distribution  of stock, or rights to acquire stock, or from any event so treated
for  income tax  purposes.  See  "Certain  Federal  Income Tax  Consequences-Tax
Consequences for U.S. Holders-Potential  Distributions Resulting from Adjustment
of Conversion Price" on page 40.

         If a  reorganization  event occurs,  you will have the right to convert
notes only into the kind and amount of the  securities,  cash or other  property
you would have received had you converted  your notes  immediately  prior to the
reorganization event. We use the term reorganization event to mean:

         o        any  recapitalization or reclassification of shares of Class A
                  common stock,  other than changes involving par value, or as a
                  result of a subdivision  or  combination of the Class A common
                  stock,

         o        any consolidation or merger involving our company,  other than
                  one that does not  result in a  reclassification,  conversion,
                  exchange or cancellation of Class A common stock,

         o        any  sale  or  transfer  of  all or  substantially  all of our
                  assets, or

         o        any compulsory share exchange pursuant to which any holders of
                  Class A  common  stock  shall be  entitled  to  receive  other
                  securities, cash or other property.

         Any company that succeeds to us or acquires our assets will be required
to provide in its governing  documents  the foregoing  right and also to provide
for  other  rights   essentially   equivalent  to  those  described  under  this
"--Conversion" heading.

                                      -16-
<PAGE>

Payment of Excess Cash Dividends

         If we  declare  and pay  excess  cash  dividends  on the Class A common
stock,  we will pay you an amount  equal to the  excess,  based on the number of
shares of Class A common stock that you would have  received  had you  converted
all of your notes, unless you convert and receive those dividends as a holder of
Class A common  stock.  We use the  term  excess  cash  dividends  to mean  cash
dividends in an annualized amount per share that exceeds the greater of

         o        the annualized  amount per share of the immediately  preceding
                  cash  dividend  on the  Class A  common  stock,  appropriately
                  adjusted for anti-dilution type events, and

         o        15% of the last sale  price of the Class A common  stock as of
                  the trading day immediately  preceding the declaration date of
                  that dividend.

         Our  credit  facilities   effectively  restrict  us  from  paying  cash
dividends or making excess cash dividend payments on the notes.

Change in Control

         If we  experience a change in control,  then you will have the right to
require us to repurchase for cash all or a portion of your notes. The repurchase
price of the 6.25% notes and the 5.00% notes is equal to the principal amount of
the  notes,  plus  accrued  and  unpaid  interest,  through  the  day  prior  to
repurchase.  The cash  repurchase  price of the  2.25%  notes is their  accreted
value,  plus accrued and unpaid  interest,  through the day prior to repurchase.
The repurchase day is 45 days after notice to you. By accreted value we mean the
issue price of the 2.25% notes plus accrued original issue discount.  This right
to require us to  repurchase  the notes  will exist upon the  occurrence  of any
change in control  whether or not the relevant  transaction has been approved by
our management.  It may not be waived by our  management.  Your exercise of this
right will be  irrevocable.  We must  obtain  lender  approval  under our credit
facilities in order to make any change in control  payments before July 1, 2008.
We may not be able to obtain that approval.

         Your  right to  require  us to  repurchase  the notes  upon a change in
control will not apply if either:

         o        the last sale  price of the  Class A common  stock for five of
                  the ten trading  days before the date of the change in control
                  equals or exceeds 105% of the applicable conversion price; or

         o        the  consideration  paid  for the  Class A  common  stock in a
                  transaction  constituting  the change in control  consists  of
                  cash,  securities  that are  traded on a  national  securities
                  exchange or quoted on the National  Association  of Securities
                  Dealers,   Inc.  Automated  Quotation  System  or  the  Nasdaq
                  National Market, or a combination of cash and such securities,
                  and the aggregate fair market value of such consideration is a
                  least  105% of the  conversion  price  in  effect  immediately
                  before the closing of that transaction.

         The existence of the right to require us to repurchase the notes upon a
change in control may deter certain  mergers,  tender  offers or other  takeover
attempts and may thereby adversely affect the market price of the Class A common
stock.

         By a change in control we mean:

         o        any person or group,  other than a permitted  owner,  acquires
                  direct  or  indirect  beneficial  ownership  of  shares of our
                  capital  stock  sufficient  to entitle such person to exercise
                  more than 50% of the total  voting power of all classes of our
                  capital  stock  entitled to vote  generally  in  elections  of
                  directors.  An acquisition could occur by means of an exchange
                  offer,  liquidation,  tender  offer,  consolidation,   merger,
                  combination, reclassification,  recapitalization or otherwise,
                  or

                                      -17-
<PAGE>

         o        we  sell,  lease,  exchange  or  otherwise  transfer,  in  one
                  transaction  or a  series  of  related  transactions,  all  or
                  substantially all of our assets to any person or group,  other
                  than to a permitted owner.

         However,  a transaction of a type  described  above that results in the
Class A common stock no longer being listed on a stock exchange or traded on the
Nasdaq  National  Market  would also be treated as a change in control even if a
permitted owner were involved.

         We use a  permitted  owner  to  mean  one  or  more  of  our  principal
stockholders  or any person  employed by us in a  management  capacity as of the
original  offering of the notes,  or any group of which any of them is a member.
We use the terms person and group as those terms are used in Section 13(d)(3) or
14(d)(2) of the  Exchange  Act.  Principal  stockholder  means  Steven B. Dodge,
Thomas H. Stoner,  Hicks, Muse, Tate & Furst  Incorporated,  Cox Telecom Towers,
Inc. and Clear Channel Communications, Inc. and includes their affiliates.

Optional Redemption

         6.25%  notes.  We may not redeem 6.25% notes prior to October 22, 2002.
On or after that date, at our option, we may redeem the 6.25% notes, in whole or
in part, at the following  redemption  prices,  expressed as a percentage of the
principal  amount.  We are also required to pay any accrued and unpaid  interest
upon redemption.

  Twelve Months (or shorter period) commencing               Redemption Price
  --------------------------------------------               ----------------
    October 22, 2002    ............................................103.125%
    October 15, 2003    ............................................102.083
    October 15, 2004    ............................................101.042
    October 15, 2005 and thereafter.................................100.000

         2.25%  notes.  We may not redeem 2.25% notes prior to October 22, 2003.
On or after that date, at our option, we may redeem the 2.25% notes, in whole or
in part, at the applicable  redemption  price.  The table below shows redemption
prices of notes per  $1,000  principal  amount on the dates  listed.  The prices
reflect the accrued  original issue discount  calculated  through each date. The
redemption  price of a 2.25% note redeemed  between these dates would include an
additional  amount  reflecting  the additional  original issue discount  accrued
since the next preceding date in the table to the actual redemption date.

                                                       (2)             (3)
                                      (1)        Original Issue     Redemption
          Redemption Date      Note Issue Price     Discount     Price (1) + (2)
          ---------------      ----------------     --------     ---------------
October 22, 2003.............     $705.20            $97.73          $802.93
October 15, 2004.............      705.20            125.28           830.48
October 15, 2005.............      705.20            155.14           860.34
October 15, 2006.............      705.20            186.90           892.10
October 15, 2007.............      705.20            220.68           925.88
October 15, 2008.............      705.20            256.60           961.80
October 15, 2009 (maturity)..      705.20            294.80         1,000.00


         5.00%  notes.  We may not redeem the 5.00% notes prior to February  20,
2003.  On or after that date, at our option,  we may redeem the 5.00% notes,  in
whole or in part, at the following redemption prices,  expressed as a percentage
of the  principal  amount.  We are also  required  to pay any accrued and unpaid
interest upon redemption.


    Twelve Months (or shorter period) commencing              Redemption Price
    --------------------------------------------              ----------------
       February 20, 2003.....................................   102.500%
       February 15, 2004.....................................   101.670%
       February 15, 2005.....................................   100.830%
       February 15, 2006 and thereafter......................   100.000%

                                      -18-
<PAGE>

         We must give  holders at least 20 and not more than 60  calendar  days'
notice of any redemption date of any series of notes.

Repurchase of Notes at the Option of the Holder

         6.25% notes.  On October 22, 2006,  you have the right to require us to
repurchase  any  outstanding  6.25%  notes if certain  conditions  are met.  The
repurchase  price of a 6.25% note will be equal to its principal amount together
with accrued and unpaid interest  through the repurchase  date. If you desire us
to  repurchase  your 6.25% notes,  you must give,  and not  withdraw,  a written
repurchase  notice to the trustee at any time during the 20 business  days prior
to and including October 22, 2006.

         2.25% notes.  On October 22, 2003,  you have the right to require us to
repurchase  any  outstanding  2.25%  notes if certain  conditions  are met.  The
repurchase price of a 2.25% note will be equal to $802.93, which is its accreted
value on October 22, 2003, in other words, its issue price plus accrued original
issue discount, together with accrued and unpaid interest through the repurchase
date. If you desire us to repurchase  your 2.25% notes,  you must give,  and not
withdraw,  a written  repurchase notice to the trustee at any time during the 20
business  days prior to October  22, 2003 until the close of business on October
22, 2003.

         5.00% notes.  On February 20, 2007, you have the right to require us to
repurchase  any  outstanding  5.00%  notes if certain  conditions  are met.  The
repurchase  price of a 5.00% note will be equal to its principal amount together
with accrued and unpaid interest  through the repurchase  date. If you desire us
to  repurchase  your 5.00% notes,  you must give,  and not  withdraw,  a written
repurchase  notice to the trustee at any time during the 20 business  days prior
to and including February 20, 2007.

         We may, at our option,  elect to pay the repurchase price of any series
of notes in cash or shares of Class A common stock, or any combination thereof.

         We will be  required to give notice on a date not less than 20 business
days prior to the relevant repurchase date to you stating, among other things:

         o        what portion of the notes we will repurchase for cash and what
                  portion for Class A common stock,

         o        if we elect to use Class A common stock,  how we calculate its
                  value, and

         o        the procedures  that you must follow to require us to purchase
                  notes from you.

         If you elect to require us to purchase  notes,  the  repurchase  notice
given by you shall state:

         o        the notes to be delivered by you for purchase by us,

         o        the portion of the principal amount at maturity of notes to be
                  purchased;  this  portion must be $1,000  principal  amount at
                  maturity or an integral multiple of $1,000, and

         o        that the  notes  are to be  purchased  by us  pursuant  to the
                  applicable provisions of the notes.

         If we  elect  to pay any  portion  of the  repurchase  price in Class A
common stock, but the repurchase price is ultimately to be paid entirely in cash
because the conditions to payment in Class A common stock are not satisfied, the
repurchase  notice  shall also state  whether you elect:  (a) to  withdraw  your
repurchase notice as to any of the notes, or (b) to receive cash. If you fail to
make an election,  you will be deemed to have elected to receive cash in respect
of the entire repurchase price.

         You  may  withdraw  any  repurchase  notice  by  a  written  notice  of
withdrawal  delivered  to the  applicable  trustee  prior to 10:00  a.m.  on the
repurchase  date.  The notice of withdrawal  must state the principal  amount at
maturity,  and the  certificate  numbers of the notes as to which the withdrawal
notice  relates and the  principal  amount at maturity,  if any,  which  remains
subject to the repurchase notice.

                                      -19-
<PAGE>

         If we elect to pay any  portion  of the  repurchase  price in shares of
Class A common stock,  we will  determine the number of shares of Class A common
stock to be delivered by dividing that portion by the market price of a share of
Class A common  stock.  Our  credit  facilities  require  us to make the  entire
payment in Class A common stock.

         By market price we mean,  in effect,  the average of the sale prices of
the Class A common  stock for the five  trading  day period  ending on the third
business day prior to the applicable repurchase date,  appropriately adjusted to
take into  account the  occurrence  of certain  events  that would  result in an
adjustment  of the  conversion  price with respect to the Class A common  stock.
Sales price will be determined under the terms of the indenture.

         Because we will  determine the market price of the Class A common stock
prior to the  applicable  repurchase  date,  you will bear the market  risk with
respect to the value of the Class A common stock to be received from the date of
determination to the repurchase date.

         Our right to  repurchase  notes with Class A common stock is subject to
our satisfying various conditions, including:

         o        the  registration  of the  Class  A  common  stock  under  the
                  Securities Act and the Exchange Act, if required; and

         o        any necessary  qualification or registration  under applicable
                  state  securities law or the availability of an exemption from
                  that qualification and registration.

         When we determine  the actual  number of shares of Class A common stock
in accordance with the foregoing provisions, we will publish that information in
a daily newspaper of national circulation.

         If the foregoing  conditions are not satisfied with respect to a holder
or holders  prior to the close of business on the  repurchase  date, we will pay
you the  repurchase  price of your tendered  notes  entirely in cash. We may not
change  the  form of  consideration  to be  paid  once  we  have  given  you the
applicable notice, except as described in the prior sentence.

         We will comply with the  provisions  of Rule 13e-4,  Rule 14e-1 and any
other tender offer rules under the Exchange Act that may then be applicable  and
will file  Schedule  TO or any other  schedule  required  under  those  rules in
connection with any offer by us to purchase notes at the option of holders.

         We may not  purchase  notes  for  cash at your  option  if an  event of
default continues with respect to the notes described under "--Events of Default
and  Remedies"  immediately  below,  other than a default in the  payment of the
repurchase price with respect to the notes.

         Payment  of the  repurchase  price  for a note for  which a  repurchase
notice has been delivered and not validly withdrawn is conditioned upon delivery
of the note,  together with necessary  endorsements to the applicable trustee at
any time after  delivery of such  repurchase  notice.  Payment of the repurchase
price for the note will be made promptly  following the later of the  repurchase
date or the delivery of the note. If the relevant  trustee holds,  in accordance
with the  terms of its  indenture,  money or  securities  sufficient  to pay the
repurchase  price of the note on the business day following the repurchase date,
then,  immediately  after  the  repurchase  date,  the  note  will  cease  to be
outstanding  and  interest  and,  in the case of  2.25%  notes,  original  issue
discount  will  cease to  accrue,  whether  or not you  deliver  the note to the
trustee. In that event, all of your other rights shall terminate, other than the
right to receive the repurchase price upon delivery of your note.

         Our ability to redeem  notes and to  repurchase  notes upon a change in
control or at your  option,  as described in the three  preceding  sections,  is
restricted  under  the  terms  of  our  credit  facilities  and  is  effectively
prohibited  during the existence of a default under them.  See  "Description  of
Certain Indebtedness."

                                      -20-
<PAGE>

Events of Default and Remedies

         An event of default is  defined in each  indenture  as being any of the
following:

         o        our default in payment of the  principal  amount at  maturity,
                  issue price plus accrued  original issue discount (2.25% notes
                  only),  repurchase  price,  optional  redemption  price or any
                  change in control  repurchase  price when due, upon  maturity,
                  acceleration, redemption or otherwise, on any of the notes,

         o        our  default  for 30 days in  payment  of any  installment  of
                  interest on the notes,

         o        our  default  for 60 days after  notice in the  observance  or
                  performance   of  any  other   covenants  in  the   applicable
                  indenture, and

         o        certain  events   involving  our  bankruptcy,   insolvency  or
                  reorganization.

         Each  indenture  provides  that if any  event of  default  exists,  the
applicable  trustee or the holders of not less than 25% in  principal  amount of
the notes of a relevant series then  outstanding may declare the relevant amount
of all notes of that  series to be due and  payable  immediately.  The  relevant
amount for the 6.25% and the 5.00% notes is their principal amount. The relevant
amount for the 2.25% notes is the sum of their issue price plus accrued original
issue discount from their date of issue to the date of acceleration. However, if
we cure all  defaults,  except the  nonpayment  of principal  and interest  with
respect to any notes of that series that become due by acceleration, and certain
other conditions are met, the holders of a majority in principal amount of notes
of that  series then  outstanding  may rescind  that  acceleration.  Holders may
similarly waive past defaults.

         The  holders  of a  majority  in  principal  amount of the notes of the
relevant series then outstanding  have the right to direct the time,  method and
place of conducting  any  proceedings  for any remedy  available to the trustee,
subject to certain limitations specified in the relevant indenture.

         Each  indenture  provides  that the  trustee  shall give  notice to the
holders of notes of any default, except in payment of principal or interest with
respect  to the  notes,  if the  trustee,  in good  faith,  considers  it in the
interest of the holders of the notes of that series to dispense with notice.

Modification of the Indentures

         Each indenture contains provisions  permitting us and the trustee, with
the consent of the holders of not less than a majority  in  principal  amount of
the  notes  of the  relevant  series  at the time  outstanding,  to  modify  the
indenture  and the rights of the holders of the notes of that  series.  However,
without the consent of the holder of each note so  affected,  we cannot make any
modification that will:

         o        extend the final maturity of any notes,

         o        reduce the rate or extend the time for payment of interest,

         o        reduce the principal amount or any premium,

         o        change the accrual  rate or time of payment of original  issue
                  discount on the 2.25% notes,

         o        change  the  provisions  for  redemption  at the option of the
                  holders in a manner adverse to the holders,

         o        impair or affect the right of a holder to  institute  suit for
                  the payment of principal, interest or any premium,

                                      -21-
<PAGE>

         o        change the currency in which the notes are payable,

         o        impair  the right to  convert  the notes  into  Class A common
                  stock, or

         o        reduce the percentage of notes of that series,  the consent of
                  the holders of which is required for any modification.

Global Notes, Book-Entry Form

         The notes  will be  represented  by global  notes,  except as set forth
below under "--Certificated  Notes." The global notes will be deposited with, or
on behalf of, DTC and  registered  in the name of Cede & Co., as DTC's  nominee.
Beneficial  interests in the global notes will be  exchangeable  for  definitive
certificated notes only in accordance with the terms of the relevant indenture.

         DTC is a  limited-purpose  trust company  organized  under the New York
Banking Law, a banking  organization  within the meaning of the New York Banking
Law, a member of the Federal Reserve System, a clearing  corporation  within the
meaning  of the New  York  Uniform  Commercial  Code,  and a  "clearing  agency"
registered  pursuant to the  provisions  of Section 17A of the Exchange Act. DTC
holds  securities that its  participants  deposit with DTC. DTC also facilitates
the  settlement  among  participants  of  securities   transactions,   including
transfers and pledges, in deposited  securities through electronic  computerized
book-entry changes in participants'  accounts,  thereby eliminating the need for
physical  movement  of  securities  certificates.  Direct  participants  include
securities brokers and dealers,  banks, trust companies,  clearing corporations,
and  certain  other  organizations.  DTC is  owned  by a  number  of its  direct
participants  and by the NYSE, the American Stock  Exchange,  Inc. and the NASD.
Access to DTC's system is also  available to others such as  securities  brokers
and  dealers,  banks and trust  companies  that  clear  through  or  maintain  a
custodial relationship with a direct participant, either directly or indirectly.
The rules applicable to DTC and its participants are on file with the SEC.

         Purchases  of interests in global notes under DTC's system must be made
by or through direct participants,  which will receive a credit for the interest
in the global  notes on DTC's  records.  The  ownership  interest of each actual
purchaser  of each  interest  in the  global  notes (we call it the  "beneficial
owner")  is in turn to be  recorded  on the direct  and  indirect  participants'
records.  Beneficial  owners will not receive written  confirmation  from DTC of
their  purchase,   but  beneficial   owners  are  expected  to  receive  written
confirmations  providing  details  of  the  transaction,  as  well  as  periodic
statements of their holdings,  from the direct or indirect  participant  through
which the beneficial owner entered into the transaction.  Transfers of ownership
interests  in the global  notes are to be  accomplished  by entries  made on the
books of participants  acting on behalf of beneficial owners.  Beneficial owners
will not receive  certificates  representing their ownership interests in global
notes,  except in the event  that use of the  book-entry  system for one or more
global notes is discontinued.

         To  facilitate  subsequent  transfers,  all global  notes  deposited by
participants with DTC are registered in the name of DTC's  partnership  nominee,
Cede & Co. The deposit of global  notes with DTC and their  registration  in the
name of  Cede & Co.  effects  no  change  in  beneficial  ownership.  DTC has no
knowledge of the actual  beneficial  owners of the global  notes.  DTC's records
reflect  only the identity of the direct  participants  to whose  accounts  such
global notes are credited,  which may or may not be the beneficial  owners.  The
participants  will remain  responsible  for keeping account of their holdings on
behalf of their customers.

         Conveyance  of  notices  and  other  communications  by DTC  to  direct
participants,  by direct  participants  to indirect  participants  and by direct
participants and indirect  participants to beneficial owners will be governed by
arrangements among them, subject to any statutory or regulatory  requirements as
may be in effect.

         Redemption  notices  will be sent to Cede & Co. If less than all of the
global notes are being redeemed,  and unless otherwise  notified by either us or
the relevant  trustee,  DTC's  practice is to determine by lot the amount of the
interest of each direct participant in such issue to be redeemed.

         Neither DTC nor Cede & Co. will  consent or vote with respect to global
notes. Under its usual procedures,  DTC will mail an omnibus proxy to us as soon
as possible  after the record  date.  The  omnibus  proxy  assigns  Cede &

                                      -22-
<PAGE>

Co.'s consenting or voting rights to those direct participants to whose accounts
the global  notes are  credited  on the record  date.  This is  identified  in a
listing attached to the omnibus proxy.

         Payment of interest  on and the  redemption  price of the global  notes
will be made to DTC. DTC's practice is to credit direct  participants'  accounts
on the payment date in accordance with their respective  holdings shown on DTC's
records unless DTC has reason to believe that it will not receive payment on the
payment date.  Payments by participants to beneficial owners will be governed by
standing  instructions  and customary  practices as is the case with  securities
held for the accounts of customers in bearer form or registered in "street name"
and will be the responsibility of such participant and not of DTC, any agents or
us. The foregoing is subject to any statutory or regulatory  requirements as may
be in effect from time to time.  Payment of interest on and the redemption price
of the global notes to DTC is our  responsibility.  Disbursement  of payments to
direct participants will be the responsibility of DTC.  Disbursement of payments
to the  beneficial  owners  will be the  responsibility  of direct and  indirect
participants.

         A  beneficial  owner must give notice to elect to have its  interest in
the global notes purchased or tendered,  through its participant,  to the paying
agent,  and  must  effect  delivery  of this  interest  by  causing  the  direct
participant to transfer the participant's interest in the global notes, on DTC's
records,  to the paying agent.  The requirement for physical  delivery of global
notes in connection  with a demand for purchase or a mandatory  purchase will be
deemed  satisfied when the ownership  rights in the global notes are transferred
by direct participants on DTC's records.

         DTC may  discontinue  providing its services as  securities  depositary
with respect to the global notes at any time by giving  reasonable  notice to us
or to our agents. Under these circumstances,  or if DTC is at any time unable to
continue as depositary and a successor  depositary is not appointed by us within
90 days, we will cause notes to be issued in definitive form in exchange for the
global notes.

         According to DTC,  the  foregoing  information  with respect to DTC has
been provided to the financial community for informational  purposes only and is
not intended to serve as a representation,  warranty or contract modification of
any kind. The  information in this section  concerning DTC and DTC's  book-entry
system has been  obtained  from sources  that we believe to be reliable,  but we
take no responsibility for the accuracy.

         Neither we, either trustee,  any paying agent nor the registrar for the
notes will have any  responsibility  or liability  for any aspect of the records
relating to or payments  made on account of beneficial  ownership  interest in a
global  security  or for  maintaining,  supervising  or  reviewing  any  records
relating to beneficial ownership interests.

Certificated Notes

         The notes  represented by the global  securities are  exchangeable  for
certificated notes in definitive form of the same series and of like tenor if:

         o        DTC  notifies us that it is unwilling or unable to continue as
                  depositary  for the global  securities  and a successor is not
                  appointed  within 90 days or if at any time DTC ceases to be a
                  clearing agency registered under the Exchange Act,

         o        an event of default has occurred and is continuing, or

         o        we, in our discretion  and at any time,  determine not to have
                  all of the notes represented by the global securities.

         Any notes that are exchangeable  pursuant to the preceding sentence are
exchangeable for  certificated  notes issuable in authorized  denominations  and
registered in those names as DTC shall  direct.  Subject to the  foregoing,  the
global securities are not exchangeable, except for global securities of the same
aggregate denominations to be registered in the name of DTC or its nominee.

                                      -23-
<PAGE>

Concerning the Trustee

         The Bank of New York is a lender  under our credit  facilities  and may
provide other commercial banking services to us in the future.


                                      -24-
<PAGE>

                                 DESCRIPTION OF
                              CERTAIN INDEBTEDNESS

Credit Facilities

         The  description  below  summarizes  the  more  important  terms of our
borrowing arrangements,  as currently in effect, which we refer to as the credit
facilities.  We have previously filed copies of the loan agreement governing the
credit  facilities  with the SEC. See "Where You Can Find More  Information"  on
page 47. You should refer to that agreement for the complete terms of the credit
facilities.  Capitalized  words used in the description  below have  specialized
meanings defined in that agreement.

         Several of our  principal  operating  subsidiaries  have  borrowed  and
expect to  continue  to borrow  under the credit  facilities.  We refer to those
borrowers  collectively  as the  borrower  subsidiaries.  The credit  facilities
provide for up to $2.0 billion of loans, the funding of which has been committed
to by the lenders.  The credit facilities also contemplate  possible  additional
borrowings  of up to $500.0  million,  although the lenders are not committed to
fund those borrowings. Borrowings under the credit facilities are limited by (a)
the cash flow of the borrower subsidiaries and the Restricted Subsidiaries,  (b)
their  construction  costs of Developing Towers, and (c) the aggregate number of
Developing Towers and AirTouch towers we acquire.

         The credit facility is made up of three separate types of loans:

         o        a $650.0 million reducing  revolving credit facility  maturing
                  on June 30, 2007,

         o        an $850.0 million multiple-draw term loan maturing on June 30,
                  2007, and

         o        a $500.0 million term loan maturing on December 31, 2007.

         We are  required  to reduce the  revolving  credit  commitments  and to
amortize the term loans  quarterly,  commencing  March 31, 2003,  in  increasing
amounts  designed to repay the loans by maturity.  We are also required to repay
the loans,  and reduce the  commitments,  out of the proceeds of asset sales and
sales of equity or debt securities,  by us or our subsidiaries,  and out of cash
flow. We can repay the loans voluntarily at any time, without penalty.

         We may incur indebtedness under the credit facilities for acquisitions,
construction  and  other  capital  expenditures,  working  capital  and  general
corporate purposes.

         The credit facilities require compliance with financial coverage ratios
that  measure  Annualized  Operating  Cash Flow  against  Total  Debt,  Interest
Expense, Pro Forma Debt Service and Fixed Charges. The credit facilities contain
other financial and operational  covenants and other restrictions with which the
borrower  subsidiaries and the Restricted  Subsidiaries must comply,  whether or
not there are any borrowings outstanding.  These include restrictions on certain
types of acquisitions, other than towers and communications sites, indebtedness,
liens, capital expenditures,  investments in Unrestricted Subsidiaries,  and the
ability of the borrower  subsidiaries  and the  Restricted  Subsidiaries  to pay
dividends or make other distributions.

         The credit  facilities  include  two events of  default  that  restrict
American Tower, the parent company:

         o        it cannot have any Indebtedness for Money Borrowed outstanding
                  other than (a) the notes, and (b) other Indebtedness for Money
                  Borrowed in an aggregate  amount not to exceed $500.0  million
                  and containing certain terms, and

         o        it is required to invest the net cash proceeds of any issue of
                  Capital Stock (other than  pursuant to permitted  acquisitions
                  and  up  to  $2.0  million   under  stock  option   plans)  or
                  Indebtedness as equity in the borrower subsidiaries.

                                      -25-
<PAGE>

         Our permitted  Indebtedness  for Money  Borrowed must (a) be unsecured,
(b) have no scheduled  payments of principal prior to June 30, 2008, (c) have no
required  cash  payments  of interest  and (d) have other  terms and  conditions
reasonably satisfactory to the Majority Lenders.

         We and the Restricted Subsidiaries have guaranteed all of the loans. We
have  secured  the loans by liens on  substantially  all assets of the  borrower
subsidiaries and the Restricted  Subsidiaries and all outstanding  capital stock
and other debt and equity interests of our direct and indirect subsidiaries.

                                      -26-
<PAGE>

                          DESCRIPTION OF CAPITAL STOCK

         The  description  below  summarizes  the  more  important  terms of our
capital  stock.  Because this section is a summary,  it does not describe  every
aspect of the capital  stock.  This  summary is subject to and  qualified in its
entirety  by  reference  to  the  provisions  of  our  restated  certificate  of
incorporation, as amended. We refer to it as the restated certificate. A copy of
the  restated  certificate  has been  filed as an  exhibit  to the  registration
statement of which this prospectus is a part.  Wherever particular defined terms
or  provisions  of the  restated  certificate  are  referred to, those terms and
provisions are  incorporated by reference as a part of the statements  made, and
the statements are qualified in their entirety by that reference.

         General

         Our authorized capital stock consists of 20,000,000 shares of preferred
stock,  $.0l par value per share,  500,000,000  shares of Class A common  stock,
$.0l par value per share,  50,000,000  shares of Class B common stock,  $.0l par
value per share, and 10,000,000  shares of Class C common stock,  $.0l par value
per share. The number of outstanding  shares of common stock as of July 19, 2000
is shown on page 4.

         Preferred Stock

         General.  Our  board of  directors  will  determine  the  designations,
preferences,  limitations and relative  rights of the 20,000,000  authorized and
unissued shares of preferred stock. These include:

         o        the  distinctive  designation of each series and the number of
                  shares that will constitute the series,

         o        the voting rights, if any, of shares of the series,

         o        the   dividend   rate  on  the  shares  of  the  series,   any
                  restriction,  limitation or condition  upon the payment of the
                  dividends, whether dividends will be cumulative, and the dates
                  on which dividends are payable,

         o        the prices at which,  and the terms and  conditions  on which,
                  the shares of the series  may be  redeemed,  if the shares are
                  redeemable,

         o        the  purchase  or sinking  fund  provisions,  if any,  for the
                  purchase or redemption of shares of the series,

         o        any preferential amount payable upon shares of the series upon
                  our liquidation or the distribution of our assets,

         o        the price or rates of conversion  at which,  and the terms and
                  conditions  on which the shares of the series may be converted
                  into other securities, if the shares are convertible, and

         o        whether the series can be exchanged,  at our option, into debt
                  securities,  and the terms  and  conditions  of any  permitted
                  exchange.

         The issuance of preferred  stock, or the issuance of rights to purchase
preferred stock, could discourage an unsolicited acquisition proposal.

         Common Stock

         Dividends.  Holders  of record of shares of common  stock on the record
date  fixed by our board of  directors  are  entitled  to receive  dividends  as
declared  by our  board of  directors  out of funds  legally  available  for the
purpose.  No dividends  may be declared or paid in cash or property on any share
of any class of common stock,  however,  unless simultaneously the same dividend
is  declared  or paid on each  share  of the  other  classes  of  common  stock.
Dividends in the form of shares of stock of any company,  including  our company
or any of our subsidiaries,  are

                                      -27-
<PAGE>

excepted from that requirement. In that case, the shares may differ as to voting
rights to the extent that voting rights now differ among the  different  classes
of common stock. In the case of any dividend  payable in shares of common stock,
holders  of each  class  of  common  stock  are  entitled  to  receive  the same
percentage  dividend,  payable in shares of that  class,  as the holders of each
other class.  Dividends and other distributions on common stock are also subject
to the rights of holders  of any series of  preferred  stock or debt that may be
outstanding  from time to time.  See  "Dividend  Restrictions"  on the following
page.

         Voting  Rights.  Holders of shares of Class A common  stock and Class B
common stock have the exclusive voting rights and will vote as a single class on
all matters submitted to a vote of the stockholders. The foregoing is subject to
the  requirements  of  Delaware  corporate  law,  special  provisions  governing
election of directors and the rights of holders of any series of preferred stock
that may be outstanding from time to time. Each share of Class A common stock is
entitled  to one vote and each share of Class B common  stock is entitled to ten
votes. The holders of the Class A common stock, voting as a separate class, have
the  right to elect  two  independent  directors.  The  Class C common  stock is
nonvoting except as otherwise required by Delaware corporate law.

         Delaware  corporate law requires the affirmative vote of the holders of
a majority of the  outstanding  shares of any class or series of common stock to
approve,  among other  things,  a change in the  designations,  preferences  and
limitations  of the shares of that class or series.  The  restated  certificate,
however,  requires the affirmative  vote of the holders of not less than 66 2/3%
of the Class A common stock and Class B common stock,  voting as a single class,
to amend most of the  provisions of the restated  certificate,  including  those
relating  to  the   provisions   of  the  various   classes  of  common   stock,
indemnification of directors,  exoneration of directors for certain acts and the
super-majority provision.

         The restated certificate:

         o        limits the  aggregate  voting power of Steven B. Dodge and his
                  controlled entities to 49.99% of the aggregate voting power of
                  all shares of capital stock entitled to vote generally for the
                  election of directors,  less the voting power  represented  by
                  the  shares  of Class B common  stock  acquired  by  Thomas H.
                  Stoner, a director,  and purchasers affiliated with him in the
                  January  1998  private  offering  and owned by them or certain
                  affiliates,

         o        prohibits  future  issuances of Class B common  stock,  except
                  upon  exercise of then  outstanding  options  and  pursuant to
                  stock dividends or stock splits,

         o        limits   transfers  of  Class  B  common  stock  to  permitted
                  transferees,

         o        provides for automatic  conversion of the Class B common stock
                  to Class A common stock if the  aggregate  voting power of Mr.
                  Dodge,  Mr. Stoner and their  respective  controlled  entities
                  falls below 21.3%, and

         o        requires  the holders of a majority of Class A common stock to
                  approve  amendments  adversely  affecting  the  Class A common
                  stock.

         On July 19, 2000, our directors and executive  officers,  together with
their  affiliates,  owned  beneficially,  within the meaning of  applicable  SEC
regulations,  approximately  39.61% of the  combined  voting power of the common
stock. On that date, Mr. Dodge, together with his affiliates, owned beneficially
approximately 26.72% of the combined voting power.

         Conversion  Provisions.  Shares  of Class B common  stock  and  Class C
common  stock are  convertible,  at any time at the option of the  holder,  on a
share for share basis into shares of Class A common stock.  The present owner of
Class C common  stock can  convert  that  stock  only upon the  occurrence  of a
conversion event or with the consent of our board of directors.  Shares of Class
B common  stock  automatically  convert into shares of Class A common stock upon
any sale, transfer,  assignment or other disposition other than (a) to permitted
transferees, or (b) pursuant to pledges but not to the pledgee upon foreclosure.
Permitted transferees includes certain family members and other holders of Class
B common stock.

                                      -28-
<PAGE>

         Liquidation Rights. Upon our liquidation, dissolution or winding up the
holders  of each  class of common  stock are  entitled  to share  ratably in all
assets available for distribution after payment in full of creditors and payment
in full to holders of preferred stock then outstanding of any amount required to
be paid to them.

         Other  Provisions.  The  holders of common  stock are not  entitled  to
preemptive  or  subscription  rights.  The  shares  of  common  stock  presently
outstanding are validly issued, fully paid and nonassessable.

         In any merger,  consolidation or business  combination,  the holders of
each class of common  stock must  receive the  identical  consideration  to that
received  by holders of each other  class of common  stock,  except if shares of
common stock or common stock of any other  company are  distributed,  the shares
may differ as to voting rights to the same extent that voting rights then differ
among the different classes of common stock.

         No class of common stock may be subdivided, consolidated,  reclassified
or otherwise changed unless, concurrently, the other classes of common stock are
subdivided,  consolidated,   reclassified  or  otherwise  changed  in  the  same
proportion and in the same manner.

         Dividend Restrictions

         Our  borrower  subsidiaries  are  prohibited  under  the terms of their
credit  facilities from paying cash dividends or making other  distributions on,
or making  redemptions,  purchases or other acquisitions of, their capital stock
or other equity interests,  including preferred stock, except that, beginning on
April 15,  2004,  if no  default  exists or would be created  thereby  under the
credit  facilities,  our borrower  subsidiaries  may pay cash  dividends or make
other  distributions to the extent that restricted  payments,  as defined in the
credit facilities,  do not exceed (a) 50% of excess cash flow, as defined in the
credit  facilities,  for  the  preceding  calendar  year  or (b)  50% of the net
proceeds of any debt or equity offering after June 16, 1998.

         Delaware Business Combination Provisions

         Under  Delaware   corporate  law,  certain   "business   combinations,"
including the issuance of equity securities,  between a Delaware corporation and
any "interested  stockholder" must be approved by the holders of at least 66 2/3
of the voting stock not owned by the interested  stockholder if it occurs within
three years of the date the person became an interested stockholder.  The voting
requirement  does  not  apply,   however,   if,  before  the  acquisition,   the
corporation's board of directors approved either the business combination or the
transaction  which  resulted in the person  becoming an interested  stockholder.
"Interested stockholder" means any person who owns, directly or indirectly,  15%
or more of the voting power of the  corporation's  shares of capital stock.  The
provision  does not apply to Mr. Dodge  because our board of directors  approved
the transaction pursuant to which he became an interested stockholder.

         Listing of Class A Common Stock

         Our Class A common stock is traded on the NYSE under the symbol "AMT."

         Transfer Agent and Registrar

         The transfer agent and registrar for the common stock is  Computershare
Investor Services LLC, 2 North La Salle, 3rd floor, Chicago, IL 60602 (telephone
number (312) 588-4991).

                                      -29-
<PAGE>

                             SELLING SECURITYHOLDERS

         The  notes  were  originally  issued  by us and  sold  by  the  initial
purchasers in private transactions exempt from the registration  requirements of
the Securities Act to "qualified  institutional buyers," as defined in Rule 144A
under the  Securities  Act.  The selling  securityholders  may from time to time
offer and sell pursuant to this  prospectus  any or all of the notes and Class A
common stock  issuable  upon  conversion  or exchange of the notes.  The selling
securityholders  will  determine  the actual  number of notes and Class A common
stock  issuable  upon  conversion  or exchange of the notes that they will sell.
Because the selling  securityholders may sell all, some or none of the notes and
Class A common stock issuable upon  conversion or exchange of the notes,  we are
unable to estimate  the number of notes and Class A common stock  issuable  upon
conversion or exchange of the notes that will be held by them upon completion of
the offering.  Prior to any use of this  prospectus in connection with a sale of
the notes and Class A common stock  issuable upon  conversion or exchange of the
notes,  we may supplement  this  prospectus to contain  additional  terms of the
offering of such notes and Class A common  stock  issuable  upon  conversion  or
exchange of the notes.

         The  following  table sets forth  certain  information  concerning  the
principal amount of the notes beneficially owned by each selling  securityholder
and the number of, and Class A common stock issuable upon conversion or exchange
of, the notes that may be offered from time to time pursuant to this prospectus.
<TABLE>
<CAPTION>

                                                                            Number of
                                                                             Shares
                                                              Principal      Issuable
                                                              Amount of       Upon       Number of     Percentage of
                                                             6.25% Notes    Conversion     Shares       Class A Common
                                                             Beneficially   of 6.25%    Beneficially        Stock
                Selling Securityholders                         Owned         Notes        Owned**      Outstanding***
                -----------------------                         -----         -----        -------      --------------
<S>                                                           <C>           <C>            <C>              <C>
AFG Industries, Inc.                                           380,000       15,573      --               *
Alexandra Global Investment Fund I LTD                       2,000,000       81,967      --               *
Allegheny Teledyne Inc. Pension Plan                         3,100,000      127,049      --               *
Alstott Investments, LLC                                     1,500,000       61,475      --               *
Aquinas Equity Growth Fund                                     360,000       14,754      --               *
Argent Classic Convertible Arbitrage Fund (Bermuda)         28,000,000    1,147,540      --               *
L.P.
Associated Electric & Gas Insurance Services Limited           600,000       24,590      --               *
Bank of America Pension Plan                                 2,000,000       81,967      --               *
Barclays Capital Securities Limited                          1,000,000       40,983      --               *
California Public Employees' Retirement System               8,000,000      327,868      --               *
CIBC World Markets (International) Arbitrage                10,145,000      415,778      --               *
City of Orlando                                                170,000        6,967      --               *
Davis Convertible Securities Fund                            7,800,000      319,672      --               *
Delta Airlines Inc. Retirement Plan                          2,800,000      114,754      --               *
Deutsche Bank Securities Inc. (1)                            9,000,000      368,852      --               *
Duckbill & Co.                                               2,000,000       81,967      --               *
Evergreen Growth & Income Fund                               1,900,000       77,868      --               *
Evergreen Income & Growth Fund                               6,000,000      245,901      --               *
Evergreen Utility Fund                                       5,000,000      204,918      --               *
Evergreen Variable Annuity Growth & Income Fund                100,000        4,098      --               *
General Motors Welfare Benefit Trust                         2,000,000       81,967      --               *
GranGem 23 41 LLC                                              500,000       20,491      --               *
Great Lakes Protection Fund                                    250,000       10,245      --               *
Hamilton Family Trust                                          400,000       16,393      --               *

                                      -30-
<PAGE>

Hartford Dividend and Growth Fund                            1,200,000       49,180      --               *
Hartford Dividend and Growth Fund, Inc.                      9,200,000      377,049      --               *
Highbridge Capital Corporation                               1,000,000       40,983      --               *
Ithaca College                                                 100,000        4,098      --               *
J.F. Maddox Foundation                                         210,000        8,606      --               *
John M. Olin Foundation, Inc.                                1,000,000       40,983      --               *
Kaleida Health - Master Investment Trust                        40,000        1,639      --               *
Kaleida Health - Retirement Trust                               90,000        3,688      --               *
Kaleida Health - Self Insurance Trust                           30,000        1,229      --               *
Kentfield Trading, Ltd.                                      8,993,000      368,565      --               *
LibertyView Funds, L.P.                                        650,000       26,639      --               *
Lipper Convertibles, L.P.                                    9,000,000      368,852      --               *
Lipper Offshore Convertibles, L.P.                           3,000,000      122,950      --               *
LLT Limited                                                    100,000        4,098      --               *
Mary Ann Hamilton                                              400,000       16,393      --               *
Maryland State Retirement Fund                               4,100,000      168,032      --               *
McMahan Securities Company, L.P.                               250,000       10,245      --               *
MFS Series Trust V: MFS Total Return Fund                    1,790,000       73,360      --               *
Morgan Stanley Dean Witter (1)                               1,730,000       70,901      --               *
Morgan Stanley Dean Witter Convertible Securities            1,500,000       61,475      --               *
Trust (1)
Museum of Fine Arts, Boston                                     14,000          573      --               *
New York Life Insurance Company                             13,000,000      532,786      --               *
New York State Teamsters Health & Hospital Fund              2,000,000       81,967      --               *
Oppenheimer Convertible Securities Fund                      5,000,000      204,918      --               *
Parker-Hannifen Corporation                                     24,000          983      --               *
Peoples Benefit Life Insurance Company                       5,000,000      204,918      --               *
ProMutual                                                       50,000        2,049      --               *
Putnam Balanced Retirement Fund                                 28,000        1,147      --               *
Putnam Convertible Income-Growth Trust                          36,000        1,475      --               *
Putnam Convertible Opportunities and Income Trust               36,000        1,475      --               *
Robert P. Luciano                                               20,000          819      --               *
Scientifc-Atlanta, Inc.                                        150,000        6,147      --               *
SG Cowen Securities Corp.                                    2,500,000      102,459      --               *
Shirley Acheson Shirock Trust                                   50,000        2,049      --               *
South Dakota Retirement System                               3,000,000      122,950     55,000            *
Southport Management Partners L.P.                             300,000       12,295      --               *
Southport Partners International Ltd.                          600,000       24,590      --               *
The Retail Clerks Pension Trust                              2,000,000       81,967      --               *
Tribeca Investments LLC                                      6,500,000      266,393      --               *
Triton Capital Investments, LTD                              2,000,000       81,967      --               *
U.S. Olympic Foundation                                        800,000       32,786      --               *
University of Nebraska Foundation                              400,000       16,393      --               *
University of Nebraska Foundation #2                            40,000        1,639      --               *
University of Rochester                                                                  --               *
                                                                13,000          532
                                                         ------------------------------------------------------------

       TOTAL(2)                                           $182,949,000    7,497,879     55,000          4.56%
                                                          ============    =========     ======          =====

                                      -31-
<PAGE>





                                                   Principal         Number of
                                                   Amount at      Shares of Class       Number of
                                                  Maturity of      A Common Stock       Shares of        Percentage of
                                                  2.25% Notes      Issuable Upon       Class A Common    Class A Common
                                                 Beneficially      Conversion of           Stock        Stock Outstanding
                                                Owned That May    the 2.25% Notes       Beneficially     as of July 19,
            Selling Securityholders                 be Sold       That May be Sold        Owned**            2000***
            -----------------------                 -------       ----------------        -------            -------

Others                                              $22,850,000          952,083             --                *





                                                        Principal       Number of
                                                     Amount of 5.0%  Shares Issuable     Number of    Percentage of
                                                          Notes      Upon Conversion      Shares      Class A Common
                                                      Beneficially     of the 5.0%     Beneficially       Stock
            Selling Securityholders                       Owned           Notes            Owned**     Outstanding***
            -----------------------                       -----           -----            -------     --------------

1976 Distribution Trust FBO Aerin                        23,000              446               --         *
Lauder/Zinterhoffer
1976 Distribution Trust FBO Jane A. Lauder               23,000              446               --         *
Allstate Insurance Company                            3,000,000           58,252               --         *
Arkansas PERS                                         1,900,000           36,893               --         *
Aspen Growth & Income Fund                              600,000           11,650               --         *
Associated Electric & Gas Insurance Services            900,000           17,475               --         *
Limited
AXP Bond Fund, Inc.                                   1,730,000           33,592               --         *
AXP Utilities Income Fund, Inc.                      10,367,000          201,300               --         *
AXP Variable Portfolio - Bond Fund                      765,000           14,854               --         *
AXP Variable Portfolio - Managed Fund                 1,031,000           20,019               --         *
Bancroft Convertible Fund, Inc.                         750,000           14,563               --         *
Bank Austria Cayman Island, Ltd.                      3,005,000           58,349               --         *
Employee Benefit Convertible Securities Fund,           250,000            4,854               --         *
DTC #955 Bank of America Personal Trust
Bankers Trust Company Trustee for Chrysler            8,242,000          160,038               --         *
Corp. EMP #1 Pension Plan DTD 4/1/89
Bear, Stearns & Co. Inc. (1)                          3,000,000           58,252               --         *
BNP Arbitrage SNC                                       500,000            9,708               --         *
Boilermakers Blacksmith Pension Trust                 1,350,000           26,213               --         *
Boulder II Limited                                    1,000,000           19,417               --         *
BP Amoco Corporation Master Trust for Employee        2,600,000           50,485               --         *
Pension Plans
BP Amoco PLC, Master Trust                            3,567,000           69,262               --         *
BVI Social Security Board                                44,000              854               --         *
CALAMOS(R) Market Neutral Fund-CALAMOS(R)               940,000           18,252               --         *
Investment Trust
Chartwell Investment Partners                         1,000,000           19,417               --         *
Chrysler Corporation Master Retirement Trust         10,425,000          202,427               --         *
CIBC World Markets                                      685,000           13,300               --         *
City University of New York                             114,000            2,213               --         *

                                      -32-
<PAGE>

Consulting Group Capital Markets Funds                  320,000            6,213               --         *
Continental Assurance Company Separate
Account (E)                                             960,000           18,640               --         *
Convexity Partners L.P.                                 250,000            4,854               --         *
Delaware PERS                                         2,410,000           46,796               --         *
Delphi Foundation, Inc.                                  28,000              543               --         *
Delta Air Lines Master Trust c/o Oaktree              3,975,000           77,184               --         *
Capital Management, LLC
Deutsche Bank Securities Inc. (1)                    16,548,000          321,320               --         *
Ellsworth Convertible Growth and Income
Fund, Inc.                                              750,000           14,563               --         *
Family Service Life Insurance Co.                       200,000            3,883               --         *
Fidelity Financial                                   12,000,000          233,009               --         *
Trust:
Fidelity Convertible Securities Fund
Forest Alternative Strategies Fund LP II
Series A5I                                              115,000            2,233               --         *
Forest Fulcrum Fund LP                                  685,000           13,300               --         *
Forest Global Convertible Fund A5                     3,890,000           75,533               --         *
Franklin and Marshall College                           568,000           11,029               --         *
GCG Total Return Series                               1,110,000           21,553               --         *
General Motors Employees Global Group Pension         5,285,000          102,621               --         *
Fund
General Motors Foundation, Inc.                         287,000            5,572               --         *
Georges et/ou Noya Andraos                              100,000            1,941               --         *
GLG Global Convertible Fund                           4,000,000           77,669               --         *
GLG Global Convertible Ucits Fund                     1,000,000           19,417               --         *
Goldman Sachs and Company (1)                           500,000            9,708               --         *
Grady Hospital                                          170,000            3,300               --         *
Granville Capital Corporation                        17,000,000          330,097               --         *
Guardian Life Insurance Co.                           7,500,000          145,631           94,500         *
Guardian Pension Trust                                  300,000            5,825               --         *
Highbridge International LLC                          7,305,000          141,844               --         *
Hotel Union & Hotel Industry of Hawaii                  899,000           17,456               --         *
Hull Overseas, Ltd.                                     250,000            4,854               --         *
ICI American Holdings Trust                           1,250,000           24,271               --         *
IDS Life Series Fund, Inc. - Income Portfolio            64,000            1,242               --         *
Independence Blue Cross                                  80,000            1,553               --         *
ITG, Inc.                                               197,000            3,825               --         *
J.M. Hull Associates, L.P.                              250,000            4,854               --         *
Janus Growth & Income Fund                           40,450,000          785,436               --         *
Jeffries & Company Inc.                                  20,000              388               --         *
Julius Baer Securities Inc.                           1,068,000           20,737               --         *
KBC Financial Products                                1,400,000           27,184               --         *
KVS Growth & Income Portfolio                           200,000            3,883               --         *
Lipper Convertibles Series II, L.P.                     500,000            9,708               --         *
Lipper Convertibles, L.P.                             3,000,000           58,252               --         *
Lipper Offshore Convertibles, L.P.                    1,000,000           19,417               --         *
Lipper Offshore Convertibles, L.P. #2                   500,000            9,708               --         *
LLT LTD                                                 255,000            4,951               --         *
Local Initiatives Support Corporation                    70,000            1,359               --         *

                                      -33-
<PAGE>

London Pacific Total Return                              20,000              388               --         *
Maryland Retirement System                            2,397,000           46,543               --         *
McMahan Securities Co. L.P.                              97,000            1,883               --         *
Merrill Lynch Convertible Fund, Inc. (1)                500,000            9,708               --         *
Merrill Lynch Insurance Group (1)                       389,000            7,553               --         *
MFS Total Return Fund                                 3,710,000           72,038               --         *
MFS Total Return Variable                               480,000            9,320               --         *
MFS VII-MFS Total Return Series                         410,000            7,961               --         *
MFS/Sun Life - Total Return Series                    2,870,000           55,728               --         *
Morgan Stanley & Co. (1)                              1,500,000           29,126               --         *
Morgan Stanley Dean Witter Convertible                  300,000            5,825               --         *
Securities Trust (1)
Motion Picture Industry Health Plan - Active          1,210,000           23,495               --         *
Member Fund
Motion Picture Industry Health Plan - Retiree           605,000           11,747               --         *
Member Fund
Motors Insurance Corporation                          1,400,000           27,184               --         *
Museum of Fine Arts, Boston                              50,000              970               --         *
Nations Capital Income Fund, DTC #901 Bank of         4,050,000           78,640               --         *
New York
New Hampshire Retirement System                         320,000            6,213               --         *
New Orleans Firefighters Pension                        176,000            3,417               --         *
New York Life Insurance and Annuity                   2,200,000           42,718               --         *
Corporation (NYLIAU)
New York Life Insurance Company (NYLIC)              20,300,000          394,174               --         *
Nomura Securities International Inc.                  6,150,000          119,417               --         *
Northern Income Equity Fund                           1,000,000           19,417               --         *
Occidental Petroleum                                    299,000            5,805               --         *
OCM Convertible Trust                                 4,165,000           80,873               --         *
Onex Industrial Partners Limited                      1,000,000           19,417               --         *
Oppenheimer Convertible Securities Fund               8,000,000          155,339               --         *
Pacific Life Insurance Company                        1,500,000           29,126               --         *
Parker-Hannifin Corporation                              60,000            1,165               --         *
Partner Reinsurance Company Ltd.                      2,215,000           43,009               --         *
Pell Rudman Trust Company                             2,180,000           42,330          154,460         *
Penn Treaty Network America Insurance Company           682,000           13,242              --          *
PIMCO Total Return Fund                               2,000,000           38,834              --          *
PRIM Board                                            2,800,000           54,368              --          *
ProMutual                                               200,000            3,883              --          *
Putnam Asset Allocation Funds-Balanced                1,100,000           21,359              --          *
Portfolio
Putnam Asset Allocation Funds-Convertible               700,000           13,592              --          *
Portfolio
Putnam Convertible Income-Growth Trust                7,000,000          135,922              --          *
Putnam Convertible Opportunities and Income             140,000            2,718              --          *
Trust
Rhone-Poulenc Rorer Pension Plan                         70,000            1,359              --          *
San Diego County Convertible                          2,133,000           41,417              --          *
Shell Pension Trust                                     235,000            4,563              --          *

                                      -34-
<PAGE>

State Employees' Retirement Fund of the State         5,300,000          102,912              --          *
of Delaware
State of Connecticut Combined Investment Funds       11,695,000          227,087              --          *
State of Oregon Equity                               10,000,000          194,174              --          *
State Street Bank Custodian for GE Pension            4,083,000           79,281              --          *
Trust
STI Capital Management                                1,000,000           19,417              --          *
Strong Total Return Fund, Inc.                        2,000,000           38,834              --          *
Sun America Balanced                                    360,000            6,990              --          *
Sylvan IMA Ltd. c/o Forest Investment                   685,000           13,300              --          *
Management LLC
TCW Group, Inc.                                      33,455,000          649,611              --          *
The Adams Express Company                             9,500,000          184,466              --          *
The Class IC Company, Ltd.                            1,500,000           29,126              --          *
The Estate of James Campbell                          1,164,000           22,601              --          *
The Grable Foundation                                   160,000            3,106              --          *
Total Return Portfolio                                1,053,000           20,446              --          *
Tracor Inc. Employees Retirement Plan                   322,000            6,252              --          *
UBS Warburg LLC                                          60,000            1,165              --          *
University of Rochester                                  50,000              970              --          *
Van Kampen Convertible Securities Fund (1)              935,000           18,155              --          *
Van Kampen Harbor Fund (1)                            5,065,000           98,349              --          *
Vanguard Convertible Securities Fund, Inc.           10,910,000          211,844              --          *
Viacom Inc. Pension Plan Master Trust                   129,000            2,504              --          *
White River Securities LLC (1)                        3,000,000           58,252              --          *
Writers Guild - Industry Health Fund                    276,000            5,359              --          *
ZCM/HFR Index Management, L.L.C.                        110,000            2,135              --          *
Zeneca Holdings Trust                                   990,000           19,223              --          *
Zurich HFR Master Hedge Fund Index Ltd.                  40,000              776              --          *
                                                   --------------------------------------------------------------

     TOTAL                                         $341,388,000        6,628,834         248,960        4.08%
                                                   ============        =========         =======        =====
<FN>

*    Less than 1% calculated as of July 19, 2000.
**   In addition to the shares issuable upon conversion of the notes.
***  Includes shares issuable upon conversion of the notes and additional shares beneficially owned as of July
     19, 2000.
(1)  Entity  shown in the table,  or an affiliate of the entity,  was one of the initial  purchasers  of these
     notes  and/or other notes of the Company that were sold in a private  placement.  The initial  purchasers
     acquired  such  notes at a  discount.  In  addition,  some of these  entities  or their  affiliates  have
     participated in other offerings of securities by the Company and/or have performed other banking services
     for which they have received fees.
(2)  According  to the  Depository  Trust  Company,  the  total  principal  amount  outstanding  of the  6.25%
     convertible  notes due 2009 which have not been previously  registered and sold, as of July 10, 2000, was
     $67,860,000.  The table, however,  reflects the most current information provided by the securityholders,
     which may include some notes that have already been registered.

</FN>
</TABLE>

                                                     -35-
<PAGE>

                     CERTAIN FEDERAL INCOME TAX CONSEQUENCES

         We have  based the  following  summary of  certain  federal  income tax
consequences  upon the Internal Revenue Code of 1986, as amended (we refer to it
as the Code), Treasury regulations, and rulings and decisions now in effect, all
of which are subject to change or differing interpretations.  We have not sought
a ruling from the Internal  Revenue Service with respect to any matter described
in this summary.  We can provide no assurance that the IRS or a court will agree
with the statements  made in this summary.  This summary  applies to you only if
you hold the notes and Class A common stock as capital  assets.  A capital asset
is  generally  an asset  held for  investment  rather  than as  inventory  or as
property  used in a trade or  business.  This  summary also does not discuss the
particular tax consequences  that might be relevant to you if you are subject to
special  rules under the  federal  income tax laws.  Special  rules  apply,  for
example, if you are:

         o        a bank, life insurance company,  regulated investment company,
                  or other financial institution,

         o        a broker or dealer in securities or foreign currency,

         o        a person that has a  functional  currency  other than the U.S.
                  dollar,

         o        a person  who  acquires  the notes or Class A common  stock in
                  connection  with  your  employment  or  other  performance  of
                  services,

         o        a person subject to alternative minimum tax,

         o        a person who owns the notes or Class A common stock as part of
                  a straddle,  hedging transaction,  conversion transaction,  or
                  constructive sale transaction,

         o        a tax-exempt entity, or

         o        an expatriate.

In  addition,   the  following   summary  does  not  address  all  possible  tax
consequences.   In   particular,   it  does  not  discuss   any  estate,   gift,
generation-skipping, transfer, state, local or foreign tax consequences. For all
these  reasons,  we urge you to consult with your tax advisor  about the federal
income  tax  and  other  tax  consequences  of the  acquisition,  ownership  and
disposition of the notes and Class A common stock.

         As explained  below,  the federal income tax consequences of acquiring,
owning and  disposing of the notes and Class A common stock depend on whether or
not you are a U.S. holder.  For purposes of this summary,  you are a U.S. holder
if you are a  beneficial  owner of the  notes or  Class A common  stock  and for
federal income tax purposes are:

         o        a citizen or resident of the United States, including an alien
                  individual  who is a lawful  permanent  resident of the United
                  States or meets the substantial  presence residency test under
                  the federal income tax laws,

         o        a  corporation,  partnership  or  other  entity  treated  as a
                  corporation  or  partnership  for federal income tax purposes,
                  that is  created  or  organized  in or  under  the laws of the
                  United  States,  any of the fifty  states or the  District  of
                  Columbia, unless otherwise provided by Treasury regulations,

         o        an estate the  income of which is  subject  to federal  income
                  taxation regardless of its source, or

         o        a  trust  if a  court  within  the  United  States  is able to
                  exercise primary  supervision over the  administration  of the
                  trust and one or more United States persons have the authority
                  to control all substantial decisions of the trust, or electing
                  trusts in existence on August 20, 1996 to the extent  provided
                  in Treasury regulations,

                                      -36-
<PAGE>

and if your status as a U.S. holder is not overridden under the provisions of an
applicable  tax treaty.  Conversely,  you are a  "non-U.S.  holder" if you are a
beneficial owner of the notes or Class A common stock and are not a U.S. holder.

In General

         We have  treated  the notes as  indebtedness  for  federal  income  tax
purposes.  This  summary  discussion  assumes  that  the IRS will  respect  this
classification.

         Payments  you might  receive  on the  notes  that are for  excess  cash
dividends paid on Class A common stock should be treated as potential contingent
interest  payments  and not as  distributions  on stock  potentially  taxable as
ordinary  dividend  income.   Further,  this  summary  discussion  reflects  our
expectation  that only a remote  possibility  exists  that you will  receive (a)
payments for excess cash  dividends  on Class A common  stock or (b)  additional
interest because of a registration default.

Tax Consequences for U.S. Holders

         Interest and Excess Cash Dividend Payments on the Notes

         All of the  notes  bear  interest  at a  stated  fixed  rate.  You must
generally include this stated interest in your gross income as ordinary interest
income:

         o        when you receive it, if you use the cash method of  accounting
                  for federal income tax purposes, or

         o        when it accrues,  if you use the accrual  method of accounting
                  for federal income tax purposes.

Purchase price for a note that is allocable to prior accrued stated interest may
be  treated  as  offsetting  a  portion  of the  interest  income  from the next
scheduled stated interest payment on the note.

         If you receive a payment  equivalent to an excess cash dividend paid on
our Class A common stock or a payment of additional  interest for a registration
default, and if the chances of another payment like that occurring in the future
remain remote, then you should report the payment as ordinary interest income in
the manner  discussed  above. In that event,  the tax  consequences of the notes
should otherwise remain unchanged. In contrast, if one or more of these types of
payments  cease to remain remote in the future,  then the notes would be treated
as having been retired and reissued with original  issue  discount,  and the tax
consequences  of holding the notes  would then be  governed by special  original
issue  discount rules for contingent  payment debt  instruments.  We urge you to
consult your tax advisor on the  consequences  to you if these events,  which we
believe are remote, should occur.

         Original Issue Discount on the 2.25% Notes

         In addition to the stated interest that you must include in income, the
2.25% notes are treated as having  original  issue  discount  (we refer to it as
OID), which is generally taxable to you as interest income. The amount of OID on
a 2.25% note is the excess of its stated  redemption  price at maturity over its
issue price.  A 2.25% note's stated  redemption  price at maturity is the sum of
all payments  expected to be received under the terms of the 2.25% note from the
time  of  issue  until  maturity,  except  for  the  stated  interest  which  is
unconditionally  payable  semiannually.  Its  issue  price  was  70.52%  of  the
principal amount at maturity.

         You are  required  under  section  1272 of the Code to include in gross
income, irrespective of your method of accounting, a portion of the OID for each
year  during  which you hold a 2.25%  note,  even  though  the cash to which the
income is  attributable  may not be received until maturity or redemption of the
2.25% note.  The timing of the accrual of OID is based on the 2.25% note's yield
to maturity,  which is its economic, not its stated, interest rate. The economic
interest rate is equal to the present value  discount rate at which all expected
payments on the 2.25% note would have an  aggregate  present  value equal to its
issue price. The yield to maturity of the 2.25% notes is 6.25%,  calculated on a
semi-annual basis from October 4, 1999. The amount of any OID included in income
for a taxable year is  calculated  by accruing and  compounding  interest at the
economic interest rate at semiannual intervals

                                      -37-
<PAGE>
corresponding  to the payments of stated  interest on the 2.25%  notes.  This is
known as the  "constant  yield method" of accruing  interest.  The excess of the
determined constant yield over the stated interest is the amount of OID included
in income for that  semiannual  period.  The semiannual  amounts of OID are then
allocated  evenly to each day in the semiannual  period,  and the sum of the OID
allocable to the days in your tax year  constitutes  the OID  includable in your
gross  income  for the year.  You  should  consult  your tax  advisor  about the
possibility  of using  different  accrual  periods  and  other  assumptions  for
purposes of computing OID accruals into your income.

         The amount of OID you include in income  without actual receipt of cash
increases  your  basis in your 2.25%  notes for  federal  income  tax  purposes.
Conversely,  your basis is reduced by the  actual  receipt of OID  payments  and
principal  payments.  Similarly,  the issue price of the 2.25% notes is adjusted
upward by OID  accrued  but not  received  and is  decreased  by the  receipt of
payments of OID and principal.  This  "adjusted  issue price" of a 2.25% note is
especially relevant if you purchase a 2.25% note after its original issue.

         Acquisition Premium on the 2.25% Notes

         If you  acquire a 2.25% note and your  adjusted  tax basis in the 2.25%
note upon  acquisition  is in excess of its then adjusted  issue price but below
its  stated  redemption  price at  maturity,  then you will have an  acquisition
premium  equal to this excess.  If this  happens,  then each of your  subsequent
accruals of OID into gross income would be reduced by a percentage  equal to the
amount of  acquisition  premium  divided  by the  remaining  amount of OID to be
accrued at the time you acquired the 2.25% note.  If instead you acquire a 2.25%
note and your adjusted tax basis in the 2.25% note upon acquisition is in excess
of its stated  redemption  price at maturity,  then you need not include any OID
accruals  into income and the elective  amortization  of bond premium  described
below would apply.

         Amortizable Bond Premium on the Notes

         If you acquire a 6.25% note or a 5.00% note and your adjusted tax basis
in the  6.25%  or 5.00%  note  upon  acquisition,  reduced  by the  value of the
conversion feature upon acquisition, is greater than its principal amount, or if
you  acquire a 2.25%  note and your  adjusted  tax basis in the 2.25%  note upon
acquisition, reduced by the value of the conversion feature upon acquisition, is
greater than its stated  redemption price at maturity,  then you will be treated
as  having  acquired  that  note  with bond  premium  equal to the  excess.  You
generally may elect to amortize this bond premium over the remaining term of the
note on a  constant  yield  method.  The  amount  amortized  in any year will be
treated as a reduction of your  interest  income from the note for that year. If
you do not make the election, your bond premium on a note will decrease the gain
or increase the loss that you otherwise recognize on the note's disposition. Any
election to amortize bond premium  applies to all debt  obligations,  other than
debt obligations the interest on which is excludable from gross income, that you
hold at the beginning of the first taxable year to which the election applies or
that you  thereafter  acquire.  You may not revoke an election to amortize  bond
premium  without the  consent of the IRS.  We urge you to consult  with your tax
advisor regarding this election.

         Market Discount on the Notes

         If you acquire a 6.25% note or a 5.00% note and your adjusted tax basis
in the 6.25% or 5.00% note upon  acquisition is less than its principal  amount,
or if you  acquire a 2.25%  note and your  adjusted  tax basis in the 2.25% note
upon  acquisition is less than its then adjusted  issue price,  then you will be
treated  as  having  acquired  that  note  at a  market  discount  equal  to the
difference. The foregoing does not apply if the amount of the market discount is
less than the de  minimis  amount  specified  under the Code.  Under the  market
discount  rules,  you will be required to treat any gain on the sale,  exchange,
redemption,   retirement  or  other  taxable  disposition  of  a  note,  or  any
appreciation in a note in the case of a nontaxable  disposition  such as a gift,
as ordinary  income.  The amount of ordinary  income equals the market  discount
that has not  previously  been  included  in your  income and that is treated as
having accrued on the note through the date of disposition. In addition, you may
be  required  to  defer,  until  the  maturity  of the note or  earlier  taxable
disposition,  the  deduction of all or a portion of the interest  expense on any
indebtedness incurred or continued to purchase or carry the note.

         Any market  discount  will be  considered  to accrue  evenly during the
period from the day after your  acquisition  to the  maturity  date of the note,
unless you elect to accrue the market  discount on a constant yield method.  You
may also elect to include market discount in income currently as it accrues,  on
either an even or constant yield method.  In that event,  your basis in the note
will  increase by the amounts  you so include in your

                                      -38-
<PAGE>
income. If you make this election,  the rules described above regarding ordinary
income on dispositions and deferral of interest  deductions will not apply. This
election to include market discount in income currently,  once made,  applies to
all market discount  obligations  acquired on or after the first taxable year to
which  the  election  applies.  You may not  revoke a market  discount  election
without  the  consent of the IRS.  We urge you to consult  with your tax advisor
regarding these market discount elections.

         Redemption or Sale of the Notes

         Generally,  a  redemption  or sale of your  notes  will  result in your
recognizing  taxable gain or loss equal to the difference  between the amount of
cash or property you receive and your adjusted tax basis in the notes. This rule
does not apply to cash or  property  received  that is  attributable  to accrued
interest,  because those amounts would be taxed as interest income in the manner
described  above.  Your  adjusted  tax  basis  in a 6.25%  note or a 5.00%  note
generally will be equal to your acquisition cost for the notes,  after reduction
for amounts allocated to prior accrued stated interest,  increased by any market
discount included in your income,  and reduced by any bond premium you amortized
and  principal  payments you  received.  Your adjusted tax basis in a 2.25% note
generally will be equal to your acquisition cost for the notes,  after reduction
for amounts allocated to prior accrued stated interest,  increased by any OID or
market  discount  included in your  income,  and reduced by any bond premium you
amortized  and OID or  principal  payments you  received.  Subject to the market
discount rules described  above,  your gain or loss will be capital gain or loss
and will be long-term  capital  gain or loss if your holding  period in the note
exceeds one year.

         Repurchase  of the  Notes at Your  Option  or by  Privately  Negotiated
Exchanges

         If you exercise your repurchase right, then we will exchange your notes
for cash, Class A common stock or a combination of both. In addition,  from time
to time in conjunction with a privately negotiated  transaction with you, we may
offer you  shares of our Class A common  stock as an  inducement  to  convert or
exchange  your notes.  To the extent the cash or Class A common  stock  received
constitutes  payment  of  accrued  interest,  those  amounts  should be taxed as
interest income in the manner described above. The balance of the cash and Class
A common stock should be treated as proceeds of the  conversion  or exchange and
taxed in the  following  manner.  In an exchange of notes  solely for cash,  the
repurchase  will be treated as a redemption for cash, the  consequences of which
we discussed  above.  In a conversion or an exchange of notes  involving Class A
common stock, the transaction should constitute a recapitalization  in which you
would not  recognize  any  taxable  gain  except  to the  extent of the cash you
receive,  and in which you would not recognize  any loss for federal  income tax
purposes.  Accordingly,  your tax basis in the Class A common  stock you receive
would  equal  your  adjusted  tax basis in the notes you  surrendered,  plus any
taxable  gain you  recognized  and minus the amount of cash that you received in
the  recapitalization.  Any gain would be  ordinary  income to the extent of any
accrued market  discount on your notes that you had not  previously  included in
your income,  and otherwise  would be capital gain. Any accrued market  discount
not previously included in income as of the date of the  recapitalization  would
carry over to the Class A common stock  received and would give rise to ordinary
income upon the subsequent disposition of that stock. Your holding period in the
Class A common  stock  would  include  your  holding  period  in the  notes  you
surrendered  in the  recapitalization,  except that the shares of Class A common
stock  attributable to accrued  interest would have a holding period  commencing
upon the recapitalization.

         Conversion of the Notes into Class A Common Stock; Treatment of Class A
Common Stock

         You will generally not recognize any gain or loss on conversion of your
notes solely into shares of Class A common stock,  except that shares of Class A
common stock  attributable to accrued interest may be taxable as interest in the
manner  described  above. You will have some taxable gain or loss if you receive
cash in lieu of a  fractional  share of Class A common  stock.  The cash will be
treated as your receipt of a fractional share,  followed by our redemption of it
for cash. The redemption  will be treated as a sale of your Class A common stock
which would result in your  recognition  of gain or loss equal to the difference
between the cash received and your adjusted tax basis in the fractional share of
Class A common stock  redeemed.  Any gain would be ordinary income to the extent
of any  accrued  market  discount  on your  notes  that you have not  previously
included in your income, and otherwise would be capital gain.

         Your income tax basis for the shares of Class A common  stock  received
upon  conversion  will be equal to the  adjusted  tax  basis  of the  notes  you
exchange,  except for any adjustment necessary because of your deemed

                                      -39-
<PAGE>
receipt of any  interest  upon  conversion  or your receipt of cash in lieu of a
fractional  share of Class A common  stock.  Any  accrued  market  discount  not
previously included in income as of the date of the conversion of the notes will
carry over to the Class A common stock received on conversion and will give rise
to ordinary income upon the subsequent  disposition of that stock.  Your holding
period in the Class A common stock will include your holding period in the notes
you  surrendered in the  conversion,  except that shares of Class A common stock
attributable  to accrued  interest  may have a holding  period  commencing  upon
conversion.

         Distributions on Class A common stock are treated as follows:

         o        first as  ordinary  dividend  income to the extent paid out of
                  our current or accumulated earnings and profits,

         o        next as a nontaxable return of capital that reduces your basis
                  in the  stock  dollar-for-dollar  until  the  basis  has  been
                  reduced to zero, and

         o        finally as gain from the sale or exchange of the stock.

We do not anticipate  making  distributions  on the Class A common stock at this
time.

         Subject to the market  discount  rules  discussed  above,  your sale or
other  taxable  disposition  of Class A common  stock will  generally  result in
capital  gain or loss  equal to the  difference  between  the  amount of cash or
property you receive and your adjusted tax basis in the stock.

         Potential Distributions Resulting from Adjustment of Conversion Price

         Your rights to convert  your notes into Class A common  stock allow for
the conversion price to be adjusted under a number of  circumstances,  generally
to ensure that you receive an  economically  equivalent  number of shares from a
conversion  following  stock  splits and stock  dividends  of our Class A common
stock.  Section  305  of the  Code  may  treat  some  of  these  adjustments  as
constructive  taxable  distributions of stock. This would generally occur if the
conversion price is adjusted for a taxable  distribution to the holders of Class
A common  stock.  Constructive  distributions  so  treated  would be  taxable as
follows:

         o        first as  ordinary  dividend  income to the extent paid out of
                  our current or accumulated earnings and profits,

         o        next as a  nontaxable  return of capital to the extent of your
                  basis  in the  notes  immediately  prior  to the  constructive
                  distribution, and

         o        finally as gain from the sale or exchange of the notes.

Your  adjusted  tax  basis in the  notes  would  be  increased  by  constructive
distributions  to you  taxable  as  dividends  or  gain.  Your  basis  would  be
unaffected  by  constructive  distributions  that  were  nontaxable  returns  of
capital.  Conversely,  a failure to appropriately adjust the conversion price of
the notes  could  result in a  constructive  distribution  to holders of Class A
common stock that would be taxable to them in a similar manner.

Special Tax Consequences for Non-U.S. Holders

         The federal income tax attributes of the notes and Class A common stock
for non-U.S.  holders are generally comparable to those described above for U.S.
holders.  However, special federal income tax rules apply to non-U.S. holders as
described below.

                                      -40-
<PAGE>

         In General

         If you are a  non-U.S.  holder,  you will  generally  not be subject to
federal income taxes on payments of principal,  premium,  if any, or interest or
OID on a note or upon  the  sale,  exchange,  redemption,  retirement  or  other
disposition of a note or Class A common stock, if:

         o        you do not own directly or indirectly 10% or more of the total
                  voting power of all classes of our voting stock,

         o        your  income and gain in respect of the note or Class A common
                  stock  is not  effectively  connected  with the  conduct  of a
                  United States trade or business,

         o        you are not a controlled  foreign  corporation that is related
                  to or under common control with us,

         o        we or the applicable  withholding agent have received from you
                  a properly executed,  applicable IRS Form W-8 or substantially
                  similar form in the year in which a payment of interest,  OID,
                  principal  or  premium  on a note  occurs,  or in a  preceding
                  calendar year to the extent  provided for in the  instructions
                  to the applicable IRS Form W-8,

         o        in the  case of gain  upon  the  sale,  exchange,  redemption,
                  retirement  or other  disposition  of a note or Class A common
                  stock recognized by an individual  non-U.S.  holder,  you were
                  present in the United States for less than 183 days during the
                  taxable year in which the gain was recognized, and

         o        section 897 of the Code,  discussed  below,  does not apply to
                  you.

         The IRS Form W-8 or  substantially  similar  form must be signed by you
under  penalties  of  perjury  certifying  that you are a  non-U.S.  holder  and
providing your name and address.  You must inform the  withholding  agent of any
change in the information on the statement within 30 days of the change.  If you
hold a note or Class A common stock through a securities  clearing  organization
or other qualified  financial  institution,  the organization or institution may
provide a signed statement to the withholding agent. However, in that case, they
must  generally  accompany the signed  statement with a copy of the executed IRS
Form W-8 or substantially  similar form that you provided to the organization or
institution.

         Except in the case of income or gain that is effectively connected with
the conduct of a United States trade or business,  discussed  immediately below,
interest,  OID,  dividends or gain  recognized by you which does not qualify for
exemption from taxation will be subject to federal income tax and withholding at
a rate of 30% unless  reduced or  eliminated by an  applicable  tax treaty.  For
example,  neither constructive  distributions on notes taxable as dividends, nor
excess cash  dividend  payments on notes,  nor dividends on Class A common stock
would qualify for exemption from taxation, although an applicable tax treaty may
reduce the federal income tax and withholding  rate on these items to below 30%.
You may  generally  use IRS Form 1001 to claim tax treaty  benefits for calendar
year 2000, and under new Treasury regulations  discussed below an applicable IRS
Form W-8 or substantially similar form for subsequent calendar years.

         Effectively Connected Income and Gain

         If you are a non-U.S. holder whose income and gain in respect of a note
or Class A common stock is  effectively  connected  with the conduct of a United
States trade or business,  you will be subject to regular  federal income tax on
this income and gain in generally the same manner as a U.S. holder,  and general
federal income tax return filing  requirements  will apply. In addition,  if you
are a  corporation,  you may be subject to a branch  profits tax equal to 30% of
your effectively  connected  adjusted earnings and profits for the taxable year,
unless you qualify for a lower rate under an applicable tax treaty. To obtain an
exemption from  withholding on interest,  dividends,  and OID, you may generally
supply to the  withholding  agent an IRS Form 4224 for calendar  year 2000,  and
under new Treasury  regulations  discussed  below an applicable  IRS Form W-8 or
substantially similar form for subsequent calendar years.

                                      -41-
<PAGE>
         We  believe  that we are  currently  and will  continue  to be a United
States real property holding  corporation.  Because of this,  section 897 of the
Code and the applicable Treasury regulations  potentially cause any gain or loss
you  realize  upon a  disposition  of your  notes or Class A common  stock to be
treated as effectively  connected with the conduct of a trade or business in the
United  States,  and thus taxable as  effectively  connected  gain in the manner
described above.  Section 897 can also cause realized gains that would otherwise
remain  unrecognized,  for example  gains in a  recapitalization  where you have
required us or privately  negotiated with us to repurchase your note in exchange
for Class A common  stock,  to be  recognized  in full  absent  compliance  with
procedural requirements under section 897. We believe that, provided our Class A
common stock  continues to be regularly  traded on the New York Stock  Exchange,
you will not  recognize  taxable gain under  section 897 on a  disposition  of a
6.25%,  5.00% or 2.25%  note or  Class A common  stock,  so long as you meet the
following three standards:

         o        you have not directly or indirectly  owned, at any time during
                  the five-year period  preceding the disposition,  more than 5%
                  of the  total  outstanding  6.25%  notes,  more than 5% of the
                  total  outstanding  5.00%  notes or more  than 5% of the total
                  outstanding 2.25% notes;

         o        you have not directly or indirectly  owned more than 5% of the
                  outstanding  Class A  common  stock  at any  time  during  the
                  five-year period preceding the disposition; and

         o        upon the date of your  acquisition  of any of the notes or any
                  other  interests  in our  company not  regularly  traded on an
                  established securities market, the aggregate fair market value
                  of all of your direct and  indirect  interests  in our company
                  not regularly traded on an established  securities market does
                  not exceed 5% of the aggregate value of our outstanding  Class
                  A common stock.

We urge you to consult with your tax advisor to determine whether you meet these
three standards, or whether you otherwise qualify for exemption from section 897
of the Code.

Our Deductions for Interest and OID on the Notes

         Under  section 279 of the Code,  deductions  otherwise  allowable  to a
corporation  for  interest and OID expense may be reduced or  eliminated  in the
case of corporate acquisition indebtedness. This is defined generally to include
subordinated   convertible  debt  issued  to  provide   consideration   for  the
acquisition  of  stock  or a  substantial  portion  of  the  assets  of  another
corporation,  if the acquiring  corporation does not meet statutorily  specified
debt/equity  ratio and earnings  coverage tests. Our deductions for interest and
OID  expense on any notes could be reduced or  eliminated  if the notes meet the
definition of corporate acquisition indebtedness in the year of issue. Also, the
notes could become corporate acquisition indebtedness in a subsequent year if we
initially meet the debt/equity ratio and earnings coverage tests, but later fail
them in a year  during  which we issue  additional  indebtedness  for  corporate
acquisitions.  Because the notes are not  expressly  subordinated  to any of our
unsecured  debt,  and because the notes have the same creditor  priority as more
than an  insubstantial  amount of our trade  debt,  we believe the notes are not
subordinated  within the meaning of section 279 of the Code and therefore do not
constitute corporate acquisition indebtedness.

         Under  section  163(l) of the Code,  our deduction for interest and OID
expense on the notes would be  disallowed  if they are found to be  disqualified
debt instruments. Disqualified debt instruments are debt instruments:

         o        where a  substantial  amount of the  principal  or interest is
                  required  to be paid or  converted,  or at the  option  of the
                  issuer or a related party is payable in or  convertible  into,
                  issuer equity, or

         o        which are part of an arrangement  that is reasonably  expected
                  to result in a transaction described in the preceding clause.

For these  purposes,  principal or interest on a debt  instrument  is treated as
required  to be paid in or  converted  into  issuer  equity  if the  payment  or
conversion  may be  required  at the  option of the  holder  and that  option is
substantially  certain to be  exercised.  We do not believe  that  principal  or
interest  on the notes is required  to be paid in or  converted  into our equity
under  section  163(l),  because  principal or interest on our notes may only be
exchanged  for  equity in our  company  at the  holder's  option,  and we do not
believe that this option is substantially certain to be

                                      -42-
<PAGE>

exercised. Furthermore, the legislative history of section 163(l) indicates that
the  provision  is not intended to apply to debt  instruments  with a conversion
feature where the conversion price is significantly higher than the market price
of the  stock on the issue  date of the debt.  We  believe  that the  conversion
prices of the notes were significantly higher than the market price of our Class
A common stock on the dates the notes were issued.  Accordingly, we believe that
the notes are not  disqualified  debt  instruments  under section  163(l) of the
Code. However, our conclusions in this regard are factual judgments. We can give
no legal  opinion on these  matters  and we cannot  assure you that the IRS or a
court would agree with our conclusions.

Information Reporting, Income Tax Withholding and Backup Withholding

         Information  reporting,  income tax withholding and backup  withholding
may  apply to  interest,  OID,  dividend  and  other  payments  to you under the
circumstances  discussed below. Amounts withheld are generally not an additional
tax and may be refunded or credited  against your federal  income tax liability,
provided you furnish the required information to the IRS.

         If You are a U.S. Holder. You may be subject to backup withholding at a
31% rate when you receive interest,  OID and dividends with respect to the notes
or Class A common stock, or when you receive  proceeds upon the sale,  exchange,
redemption,  retirement  or  other  disposition  of the  notes or Class A common
stock. In general,  you can avoid this backup  withholding by properly executing
under  penalties of perjury an IRS Form W-9 or  substantially  similar form that
provides:

         o        your correct taxpayer identification number, and

         o        a certification that (a) you are exempt from backup
                  withholding  because  you are a  corporation  or  come  within
                  another  enumerated  exempt  category,  (b) you  have not been
                  notified   by  the  IRS  that  you  are   subject   to  backup
                  withholding, or (c) you have been notified by the IRS that you
                  are no longer subject to backup withholding.

If you do not provide your  correct  taxpayer  identification  number on the IRS
Form W-9 or substantially  similar form, you may be subject to penalties imposed
by the IRS.

         Unless  you have  established  on a properly  executed  IRS Form W-9 or
substantially  similar form that you are a  corporation  or come within  another
enumerated  exempt category,  interest,  OID, dividend and other payments on the
notes or Class A common  stock  paid to you during the  calendar  year,  and the
amount of tax withheld, if any, will be reported to you and to the IRS.

         Special Rule for U.S. Holders  Beneficially Owned by Non-U.S.  Holders.
As stated  above,  we believe that we are  currently  and will  continue to be a
United States real property holding  corporation  under section 897 of the Code.
Section 1445 of the Code governs  income tax  withholding  for gains  taxable to
non-U.S.  holders under section 897. It provides that upon a disposition  of the
notes or  Class A common  stock,  income  tax  withholding  may be  required  of
disposing U.S. holders that are partnerships,  trusts, estates or other entities
because of their beneficial  ownership by non-U.S.  holders. We believe that, so
long as our Class A common stock  continues  to be  regularly  traded on the New
York Stock  Exchange,  you will not have to withhold upon a  disposition  of the
notes or Class A common stock under  section 1445 of the Code if you meet the 5%
thresholds  discussed  above  that are  applicable  to  non-U.S.  holders on the
disposition  of the notes and Class A common stock.  We urge you to consult with
your tax advisor to determine  whether you meet these standards,  or whether you
otherwise qualify for exemption from sections 897 and 1445 of the Code.

         Special Rule for Substantial  Acquisitions  from Non-U.S.  Holders.  As
stated  above,  we believe we are  currently  and will  continue  to be a United
States real property holding  corporation under section 897 of the Code. Because
of this,  section 1445 of the Code may require a person  acquiring  notes from a
non-U.S.  holder to withhold 10% of the purchase  price.  However,  provided our
Class A common  stock  continues  to be  regularly  traded on the New York Stock
Exchange,  this 10%  withholding is generally not required for an acquisition of
notes where the  purchase  price  constitutes  5% or less of the then  aggregate
value of the outstanding  Class A common stock. We

                                      -43-
<PAGE>

urge you to consult  with your tax  advisor to  determine  whether you meet this
standard,  or whether you otherwise  qualify for exemption  from section 1445 of
the Code.

         If You are a Non-U.S. Holder. The amount of interest, OID and dividends
paid to you on a note or Class A common stock during each calendar year, and the
amount of tax  withheld,  if any,  will  generally be reported to you and to the
IRS. This information  reporting  requirement  applies regardless of whether you
were subject to withholding or whether  withholding was reduced or eliminated by
an applicable tax treaty. Also,  interest,  OID and dividends paid to you may be
subject to backup  withholding at a 31% rate,  unless you properly  certify your
non-U.S.  holder  status  on an IRS  Form  W-8 or  substantially  similar  form.
Similarly,  information  reporting and 31% backup  withholding will not apply to
proceeds you receive upon the sale,  exchange,  redemption,  retirement or other
disposition of the notes or Class A common stock,  if you properly  certify that
you are a non-U.S. holder on an IRS Form W-8 or substantially similar form. Even
without having executed an IRS Form W-8 or substantially  similar form, however,
in some cases information reporting and 31% backup withholding will not apply to
proceeds you receive upon the sale,  exchange,  redemption,  retirement or other
disposition  of the notes or Class A common stock if you receive those  proceeds
through a broker's foreign office.

         If you are a  non-U.S.  holder  whose  income  and gain on the notes or
Class A common  stock are  effectively  connected  with the  conduct of a United
States trade or business,  a slightly  different  rule may apply to proceeds you
receive upon the sale, exchange, redemption,  retirement or other disposition of
those securities.  Until you comply with the new Treasury regulations  discussed
below,  information reporting and 31% backup withholding may apply to you in the
same  manner as to a U.S.  holder,  and thus you may have to execute an IRS Form
W-9 or substantially similar form to prevent the backup withholding.

         New  Treasury   Regulations.   New  Treasury   regulations   alter  the
withholding rules on interest, OID, dividends and sale or exchange proceeds paid
to you, effective  generally for payments after December 31, 2000 and subject to
complex transition rules. For example,  documentation and procedures  satisfying
the new Treasury regulations are deemed in some instances to satisfy current law
requirements.  In  these  instances  you or the  withholding  agent  may wish to
satisfy  the  requirements  of the new  Treasury  regulations  rather  than  the
requirements  of the  Treasury  regulations  soon to  expire.  The new  Treasury
regulations  are  complex,  and we urge you to consult  with your tax advisor to
determine how the new Treasury regulations affect your particular circumstances.

         The new Treasury  regulations  replace old IRS Forms W-8, 1001 and 4224
with a new series of IRS Forms W-8,  which you will  generally  have to properly
execute  earlier than you would have  otherwise had to for purposes of providing
replacements for the old IRS forms.  For example,  you must properly execute the
appropriate new version of IRS Form W-8 or  substantially  similar form no later
than  December 31, 2000 if you remain a non-U.S.  holder of the notes or Class A
common stock on that date.  Under the new Treasury  regulations,  it may also be
possible  for you to receive  payments on those  securities  through a qualified
intermediary  that complies with requisite  procedures  and provides  applicable
certification  of your non-U.S.  holder status on your behalf.  The new Treasury
regulations also clarify  withholding  agents' standards of reliance on executed
IRS Forms W-8 or substantially similar forms.

         If you are a  non-U.S.  holder  claiming  benefits  under an income tax
treaty,  you  should be aware  that you may be  required  to  obtain a  taxpayer
identification  number  and to certify  your  eligibility  under the  applicable
treaty's  limitations  on  benefits  article  in  order to  comply  with the new
Treasury regulations' certification  requirements.  The new Treasury regulations
also provide special rules to determine whether, for purposes of determining the
applicability  of a tax  treaty,  amounts  paid to a non-U.S.  holder that is an
entity should be treated as paid to the entity or to those holding the ownership
interests  in that  entity,  and whether the entity or the holders in the entity
are entitled to benefits under the tax treaty.

                                      -44-
<PAGE>

                              PLAN OF DISTRIBUTION

         The  notes  and  Class A common  stock may be sold from time to time to
purchasers  directly by the selling  securityholders  or through  broker-dealers
that  may  act  as  agents  or  principals,  and  for  which  they  may  receive
compensation  that  may be in  excess  of  customary  commissions.  The  selling
securityholders  may offer the notes with discounts,  concessions or commissions
from the  selling  securityholders  or the  purchasers  of the notes and Class A
common stock for whom such broker-dealers may act as agents or to whom they sell
as principals or both.

         We may issue  Class A common  stock to holders  of notes in  negotiated
private  exchanges  that are not eligible for the  exemption  from  registration
provided by Section 3(a)(9) of the Securities Act because, for example, the note
holder owns notes that have not previously been registered or the note holder is
a   broker-dealer   that  would  under  the   circumstances   be  considered  an
"underwriter." Such Class A common stock may also be resold from time to time by
any such former  note  holder who must or may be required to register  that sale
under the Securities Act because,  for example, the note holder is our affiliate
or otherwise must deliver a prospectus as described below.

         The notes and Class A common stock may be sold from time to time in one
or more transactions at fixed prices or at varying prices determined at the time
of sale that are based on prevailing market prices or at negotiated  prices. The
notes  and  Class A  common  stock  may be sold by one or more of the  following
methods of sale:

         o        a block  trade in which the broker or dealer so  engaged  will
                  attempt to sell the notes or Class A common stock as agent but
                  may position and resell a portion of the block as principal to
                  facilitate the transaction,

         o        purchases by a broker or dealer as principal  and resale by it
                  for its account pursuant to this prospectus,

         o        sales of  Class A common  stock  by a  broker  or  dealer  who
                  acquired them in a negotiated  transaction with us pursuant to
                  an exchange or conversion of notes  acquired by it as a market
                  maker or in other trading activity.

         o        ordinary brokerage  transactions and transactions in which the
                  broker solicits purchasers,

         o        an exchange  distribution in accordance with the rules of that
                  exchange,

         o        face-to-face   transactions  between  sellers  and  purchasers
                  without a broker-dealer,

         o        through the writing, buying and selling of put or call options
                  relating to the Class A common stock,

         o        through  covering  short  sales of the  Class A common  stock,
                  and/or

         o        through a combination of such methods of sale.

         At any time a particular  offer of the notes or Class A common stock is
made, a revised  prospectus  or  prospectus  supplement,  if  required,  will be
distributed. It will set forth the aggregate amount and type of securities being
offered  and the  terms  of the  offering,  including  the  name or names of any
underwriters,   brokers,   dealers  or  agents,   any  discounts,   commissions,
concessions  and  other  items   constituting   compensation  from  the  selling
securityholders  and  any  discounts,  commissions  or  concessions  allowed  or
reallowed or paid to dealers.  The prospectus  supplement  and, if necessary,  a
post-effective  amendment to the registration statement of which this prospectus
is a part,  will be filed with the SEC to reflect the  disclosure  of additional
information  with  respect to the  distribution  of the notes and Class A common
stock.

         We know of no plans, arrangements or understandings between any selling
securityholders and any broker,  dealer, agent or underwriter regarding the sale
of the securities by the selling securityholders.  We cannot assure you that any
selling  securityholder  will sell any or all of the  securities  offered  by it
under this  prospectus  or that any


                                      -45-
<PAGE>

selling  securityholder  will not transfer,  devise or gift those  securities by
other means not  described  in this  prospectus.  Notes and Class A common stock
covered by this  prospectus  may also be sold in private  transactions  or under
Rule 144 rather than pursuant to this prospectus.

         If you receive  shares of Class A common stock pursuant to a negotiated
private exchange  transaction with us, those shares will,  generally,  be freely
transferable  without further  registration  under the Securities Act by you and
without compliance with the registration and prospectus  delivery  provisions of
the  Securities  Act.  Your ability to so transfer your shares of Class A common
stock assumes you acquired those shares in the ordinary  course of your business
and you have no arrangement  with any person to participate in the  distribution
of those  shares.  Moreover,  the  foregoing  does not apply to you if you are a
broker  or  dealer  who  acquired  notes as a market  maker or in other  trading
activity,  or if you are  our  affiliate  as that  term  is  defined  under  the
Securities Act.

         Each  broker-dealer that acquires notes for its own account as a result
of market-making or other trading activities,  and then receives shares of Class
A common stock pursuant to a negotiated  private  exchange  transaction with us,
must acknowledge that it will deliver a prospectus in connection with any resale
of any of those shares.  Any negotiated  private  exchange  agreement will state
that,  by  making  that  acknowledgement  and  by  delivering  a  prospectus,  a
broker-dealer will not be deemed to admit that it is an "underwriter" within the
meaning of the Securities Act. Delivery of this prospectus, as it may be amended
or  supplemented  from time to time,  will  satisfy a  broker-dealer's  delivery
obligation  in  connection  with its  resales of those  shares of Class A common
stock.

         The  selling  securityholders  and any  brokers,  dealers or agents who
participate  in the  distribution  of the notes and Class A common  stock may be
deemed to be underwriters. Accordingly, any profits on the sale of the notes and
Class A common  stock  by them and any  discounts,  commissions  or  concessions
received by any brokers,  dealers or agents  might be deemed to be  underwriting
discounts and  commissions  under the Securities  Act. To the extent the selling
securityholders  and  any  brokers,  dealers  or  agents  may  be  deemed  to be
underwriters,  the selling  securityholders  may be subject to certain statutory
liabilities,  including  Sections 11, 12 and 17 of the  Securities  Act and Rule
10b-5  under the  Exchange  Act and will be subject to the  prospectus  delivery
requirements of the Securities Act.

         The selling  securityholders  and any other person  participating  in a
distribution  will be subject to  applicable  provisions of the Exchange Act and
the rules and regulations under that act,  including  Regulation M. Regulation M
may limit  the  timing  of  purchases  and sales of any of the notes and Class A
common stock by the selling  securityholders and any other participating person.
Furthermore,  Regulation M may restrict the ability of any person engaged in the
distribution  of the notes and Class A common  stock to engage in  market-making
activities  with respect to the particular  notes and Class A common stock being
distributed  for a period of up to five business days prior to the  commencement
of the  distribution.  All of the foregoing may affect the  marketability of the
notes  and  Class A common  stock  and the  ability  of any  person to engage in
market-making activities with respect to the notes and Class A common stock.

         Pursuant  to the  registration  rights  agreements,  we and each of the
selling  securityholders  will  be  indemnified  by the  other  against  certain
liabilities,  including certain liabilities under the Securities Act, or will be
entitled to contribution in connection with these matters.

         We have agreed to pay substantially  all of the expenses  incidental to
the  registration,  offering  and resale by the selling  securityholders  of the
notes and Class A common  stock to the public other than  commissions,  fees and
discounts of underwriters, brokers, dealers and agents.

         Pursuant to two separate registration rights agreements, we have agreed
to keep this  prospectus  current,  with  respect  to the 6.25%  notes and 2.25%
notes,  until  October  4, 2001,  and with  respect  to the 5.00%  notes,  until
February 15, 2002.  Copies of each of these  agreements are filed as exhibits to
the  registration  statement  of  which  this  prospectus  is  a  part  and  are
incorporated herein by this reference.

                                  LEGAL MATTERS

         Sullivan & Worcester  LLP,  Boston,  Massachusetts  has passed upon the
validity of the notes and the Class A common stock  issuable upon  conversion or
exchange of the notes for us. Sullivan & Worcester LLP,  Boston,


                                      -46-
<PAGE>

Massachusetts,  also  passed upon  certain  matters  relating  to United  States
federal income tax considerations for us, as our special tax counsel.  Norman A.
Bikales,  a member of the firm of  Sullivan  &  Worcester  LLP,  is the owner of
11,000  shares of Class A common stock and 41,490 shares of Class B common stock
and has options to purchase  20,000 shares of Class A common stock at $10.00 per
share and  25,000  shares of Class A common  stock at  $23.813  per  share.  Mr.
Bikales and associates of that firm serve as secretary or assistant  secretaries
for us and for certain of our subsidiaries.

                                     EXPERTS

         The  consolidated  financial  statements of American Tower  Corporation
incorporated in this  prospectus by reference from American Tower  Corporation's
Annual  Report  on Form  10-K for the year  ended  December  31,  1999 have been
audited  by  Deloitte & Touche  LLP,  independent  auditors,  as stated in their
report, which is incorporated herein by reference,  and has been so incorporated
in reliance  upon the report of such firm given upon their  authority as experts
in accounting and auditing.

         We are incorporating the following financial statements by reference in
this prospectus from our Form 8-K dated March 30, 2000:

         o        The  consolidated  financial  statements of UNIsite,  Inc. and
                  subsidiaries  as of  December  31,  1999  and 1998 and for the
                  three years ended December 31, 1999 have been  incorporated by
                  reference herein and in the registration statement in reliance
                  upon the  report of KPMG  LLP,  independent  certified  public
                  accountants,  incorporated by reference  herein,  and upon the
                  authority of said firm as experts in accounting and auditing.

         o        The  consolidated   financial   statements  of  ICG  Satellite
                  Services,  Inc. and subsidiary as of November 30, 1999 and for
                  the  eleven   months   ended   November  30,  1999  have  been
                  incorporated  by  reference  herein  and in  the  registration
                  statement in reliance upon the report of KPMG LLP, independent
                  certified  public   accountants,   incorporated  by  reference
                  herein,  and upon the  authority  of said firm as  experts  in
                  accounting and auditing.

                              ABOUT THIS PROSPECTUS

         This  prospectus  is  a  combined  prospectus  under  two  registration
statements  on Forms S-3 that we filed with the SEC,  covering the resale of the
notes and the shares issuable upon  conversion of the notes,  and a registration
statement on Form S-4 covering  the issuance of 2,000,000  additional  shares of
Class A common stock that we may offer to certain note holders to induce them to
convert or exchange their notes. This prospectus provides you with a description
of the  securities  we and the  selling  securityholders  may offer.  It may not
identify  all selling  securityholders.  We or the selling  securityholders  may
provide prospectus supplements  identifying additional selling  securityholders.
Prospectus  supplements may also add, update, or change information contained in
this  prospectus.  You  should  read both  this  prospectus  and any  prospectus
supplement  together with  additional  information  described  under the heading
"Where You Can Find More Information."


                       WHERE YOU CAN FIND MORE INFORMATION

         We file annual,  quarterly and current  reports,  proxy  statements and
other information with the SEC. You may read and copy any reports, statements or
other  information  on file at the  SEC's  public  reference  room at 450  Fifth
Street, N.W., Washington,  D.C. 20549. You can request copies of those documents
upon payment of a duplicating  fee to the SEC. You may also review a copy of the
registration  statement at the SEC's regional  offices in Chicago,  Illinois and
New  York,  New  York.  Please  call  the  SEC  at  1-800-SEC-0330  for  further
information on the operation of the public  reference  rooms. You can review our
SEC filings and the registration  statement by accessing the SEC's Internet site
at http:www.sec.gov.

         The SEC allows us to "incorporate by reference" the information we file
with them,  which means that we can  disclose  important  information  to you by
referring you to those documents.  The information  incorporated by

                                      -47-
<PAGE>

reference  is  considered  to be  part of this  prospectus.  Statements  in this
prospectus  regarding the contents of any contract or other  document may not be
complete.  You should refer to the copy of the contract or other  document filed
as an exhibit to the registration  statement.  Later  information filed with the
SEC will update and supersede  information we have included or  incorporated  by
reference in this prospectus.

         We incorporate by reference the documents  listed below and any filings
made after the date of the  original  filing of the  registration  statement  of
which this prospectus is a part made with the SEC under Section 13(a), 13(c), 14
or 15(d) of the Securities  Exchange Act of 1934 until our offering is completed
or terminated:

         o        our  Annual  Report on Form  10-K for the  fiscal  year  ended
                  December 31, 1999,

         o        our  Quarterly  Reports  on Form 10-Q for the  quarters  ended
                  March 31, 1999 and 2000,

         o        our  Current  Reports  on Form 8-K  dated  January  28,  2000,
                  January 31, 2000,  February 9, 2000,  February 24, 2000, March
                  14, 2000,  March 30, 2000,  April 13, 2000,  May 15, 2000, May
                  23, 2000, June 12, 2000, June 23, 2000, June 29,2000, July 28,
                  2000 and August 1, 2000, and

         o        the  description of our Class A common stock  contained in our
                  registration statement on Form 8-A (File No. 001-14195), filed
                  on June 4, 1998.

         We will provide you with a copy of the information we have incorporated
by  reference,  excluding  exhibits  other than  those to which we  specifically
refer.  You may obtain this  information at no cost by writing or telephoning us
at:  116  Huntington  Avenue,  Boston,   Massachusetts  02116,  (617)  375-7500,
Attention:  Director of Investor Relations.  To obtain timely delivery, you must
request the  information  no later than five  business days before you make your
investment decision.

              CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

         We have made and incorporated by reference  forward-looking  statements
in this document.  Forward-looking statements include those regarding our goals,
beliefs,  plans or current expectations and other statements contained regarding
matters  that are not  historical  facts.  For  example,  when we use the  words
believe,   expect,   anticipate   or   similar   expressions,   we  are   making
forward-looking   statements.   Forward-looking  statements  include  statements
concerning:

         o        the outcome of our growth strategy,

         o        future results of operations,

         o        liquidity and capital expenditures,

         o        construction and acquisition activities,

         o        debt  levels  and the  ability  to obtain  financing  and make
                  payments on our debt,

         o        regulatory  developments  and  competitive  conditions  in the
                  communications site and wireless carrier industries,

         o        projected growth of the wireless  communications  and wireless
                  carrier industries,

         o        dependence  on  demand  for   satellites   for  Internet  data
                  transmission, and

         o        general economic conditions

                                      -48-
<PAGE>

         Our forward-looking  statements are subject to risks and uncertainties.
You should note that many factors, some of which are discussed elsewhere in this
prospectus or in the documents we have  incorporated by reference,  could affect
us in the future and could  cause our  results to differ  materially  from those
expressed in our forward-looking  statements.  For a discussion of some of these
factors, please read carefully the information under "Risk Factors" beginning on
page 6. We are not required to release publicly the results of any revisions to
these  forward-looking  statements  we may  make to  reflect  future  events  or
circumstances.


                                      -49-
<PAGE>













                                     [LOGO]



<PAGE>


                           AMERICAN TOWER CORPORATION
                       REGISTRATION STATEMENT ON FORM S-4

                                     PART II

                   INFORMATION NOT REQUIRED IN THE PROSPECTUS

Item 20. Indemnification of Directors and Officers.

     Section 145 of the DGCL provides,  in effect,  that any person made a party
     to any action by reason of the fact that he is or was a director,  officer,
     employee or agent of ATC may and, in certain cases,  must be indemnified by
     ATC against,  in the case of a  non-derivative  action,  judgments,  fines,
     amounts paid in settlement and reasonable  expenses  (including  attorney's
     fees),  if in either  type of action he acted in good faith and in a manner
     he reasonably believed to be in or not opposed to the best interests of ATC
     and, in a non-derivative  action, which involves a criminal proceeding,  in
     which  such  person had no  reasonable  cause to believe  his  conduct  was
     unlawful.  This  indemnification does not apply, in a derivative action, to
     matters as to which it is adjudged that the director,  officer, employee or
     agent is liable to ATC,  unless  upon court  order it is  determined  that,
     despite  such   adjudication   of  liability,   but  in  view  of  all  the
     circumstances  of  the  case,  he is  fairly  and  reasonably  entitled  to
     indemnity for expenses.

     Article XII of ATC's By-Laws  provides that ATC shall indemnify each person
     who is or was an officer or director of ATC to the fullest extent permitted
     by Section 145 of the DGCL.

     Article Sixth of ATC's Restated  Certificate states than no director of ATC
     shall be personally  liable to ATC or its stockholders for monetary damages
     for breach of  fiduciary  duty as a director,  except for (i) breach of the
     director's  duty  of  loyalty  to ATC or its  stockholders,  (ii)  acts  or
     omissions  not in good faith or which  involve  intentional  misconduct  or
     knowing  violation of law,  (iii)  liability  under Section 174 of the DGCL
     relating to certain unlawful dividends and stock  repurchases,  or (iv) any
     transaction from which the director derived an improper personal benefit.

Item 21. Exhibits and Financial Statements Schedules.

     Listed below are the exhibits which are filed as part of this  Registration
     Statement on Form S-4 (according to the number assigned to them in Item 601
     of  Regulation  S-K).  Each  exhibit  marked  by a (+) is  incorporated  by
     reference  to the filing of ATC's  Quarterly  Report on Form 10-Q (File No.
     001-14195)  on  August  16,  1999.   Each  exhibit  marked  by  a  (++)  is
     incorporated by reference to the filing of ATC's Registration  Statement on
     Form S-3 (File No.  333-37988)  on May 26, 2000.  Each exhibit  marked by a
     (+++) is  incorporated  by  reference  to the filing of ATC's  Registration
     Statement  on Form S-3 (File No.  333-89345)  on  October  20,  1999.  Each
     exhibit  marked by a (++++) is  incorporated  by reference to the filing of
     ATC's Current  Report on Form 8-K filed on February 24, 2000.  Each exhibit
     marked by a (+++++) is  incorporated  by  reference  to the filing of ATC's
     Registration  Statement  on Form S-1 (File No.  333-50111)  filed on May 8,
     1998. Each exhibit marked by a (++++++) is incorporated by reference to the
     filing of Amendment No. 2 to ATC's Registration Statement on Form S-1 (File
     No.  333-52481)  filed on June 30, 1998.  Each  exhibit  marked by a (*) is
     incorporated by reference to the filing of ATC's Registration  Statement on
     Form S-4 (File No. 333-76083) on January 15, 1999. Each exhibit marked by a
     (**) is  incorporated  by reference to the filing of ATC's Annual Report on
     Form 10-K (File No. 001-14195) filed on March 19, 1999. Each exhibit marked
     by a (***) is incorporated by reference to ATC's Registration  Statement on
     Form S-4 (File No.  333-46025)  filed on February  10,  1998.  Each exhibit
     marked by a (****) is  incorporated  by  reference  to the  filing of ATC's
     Current  Report on Form 8-K filed on January 28, 2000.  Each exhibit marked
     by a (*****) is  incorporated  by  reference  to the filing of ATC's Annual
     Report on Form 10-K  (File No.  001-14195)  filed on March 29,  2000.  Each
     exhibit marked by a (******) is  incorporated by reference to the filing

                                      II-1
<PAGE>

     of ATC's Quarterly  Report on Form 10-Q (File No.  001-14195) on August 14,
     1998.  Each exhibit marked by a (*******) is  incorporated  by reference to
     the filing of ATC's Current Report on Form 8-K filed on September 17, 1999.
     Each exhibit  marked by a (********)  is  incorporated  by reference to the
     filing of ATC's Registration  Statement on Form S-4 (File No. 333-39030) on
     June 9, 2000. Exhibit numbers in parenthesis refer to the exhibit number in
     the applicable filing.
<TABLE>
<CAPTION>

        Exhibit   Description of Document                                         Exhibit File No.
        --------  ------------------------                                        ----------------
        No.
        ---
       <S>       <C>                                                             <C>

        3.1       Restated Certificate of Incorporation, as amended, of the
                  Company as filed with the Secretary of State of the State of
                  Delaware on June 4, 1999                                        (+3(i))

        3.2       By-Laws, as amended, of the Company                             (++3.2)

        4.1       Indenture, by and between the Company and The Bank of New York
                  as Trustee,  for the 6.25% Notes, dated as of October 4, 1999,
                  including form of 6.25% Note                                   (+++4.1)

        4.2       Indenture by and between the Company and The Bank of New York
                  as Trustee, for the 2.25% Notes, dated as of October 4, 1999,
                  including the form of 2.25% Note.                              (+++4.2)

        4.3       Form of 6.25% Note (included in Exhibit 4.1)                    Filed as part of Exhibit 4.1(+++)

        4.4       Form of 2.25% Note (included in Exhibit 4.2)                    Filed as part of Exhibit 4.2(+++)

        4.5       Registration Rights Agreement, by and between the Company and
                  the Initial Purchasers named therein, dated as of October 4,
                  1999                                                            (+++4.5)

        4.6       Indenture, by and between the Company and The Bank of New York
                  as Trustee, for the 5.0% Notes, dated as of February 15, 2000,
                  including form of 5.0% Note                                    (++++4.1)

        4.7       Form of 5.0% Note (included in Exhibit 4.6)                     Filed as part of Exhibit 4.1(++++)

        4.8       Registration Rights Agreement, by and between the Company and
                  the Initial Purchasers named therein, dated as of February 15,
                  2000                                                            Filed as Exhibit 4.5(++++)

        5         Opinion of Sullivan & Worcester LLP                             Filed as Exhibit 5(********)

        8         Tax Opinion of Sullivan & Worcester LLP                         Filed as Exhibit 8(********)

        10.1      American Tower Systems Corporation 1997 Stock Option Plan,
                  dated as of November 5, 1997, as amended and restated on April
                  27, 1998                                                        (+++++10.26)

        10.1A     Amendment to the Amended and Restated American Tower
                  Corporation 1997 Stock Option Plan as Amended and Restated on
                  April 27, 1998                                                  (*****10.1A)

        10.2      American Tower Systems Corporation Stock Purchase Agreement,
                  dated as of January 8, 1998, by and among ATC and the
                  Purchasers                                                      (***10.27)

                                      II-2
<PAGE>
<CAPTION>

        Exhibit   Description of Document                                         Exhibit File No.
        --------  ------------------------                                        ----------------
        No.
        ---
       <S>       <C>                                                             <C>

        10.3      Employment Agreement, dated as of January 22, 1998, by and
                  between ATC by and between ATI and J. Michael Gearon, Jr.       (***10.28)

        10.4      Letter of Agreement, dated as of April 13, 1998, by and between
                  ATC and Douglas Wiest                                           (*10.22)

        10.5      ARS-ATS Separation Agreement,  dated as of June 4, 1998 by and
                  among   American   Radio  Systems   Corporation,   a  Delaware
                  Corporation ("ARS"), ATC and CBS Corporation                    (++++++10.30)

        10.6      Securities Purchase Agreement, dated as of June 4, 1998 by and
                  among ATC, Credit Suisse First Boston  Corporation and each of
                  the Purchasers named therein                                    (++++++10.31)

        10.7      Registration  Rights  Agreement,  dated June 4,  1998,  by and
                  among ATC, Credit Suisse First Boston  Corporation and each of
                  the Parties named therein                                       (++++++10.32)

        10.8      Registration Rights Agreement, dated as of January 22, 1998, by
                  and among ATC and each of the Parties named therein             (******10.3)

        10.9      Stock Purchase Agreement, dated as of February 4, 1999, by and
                  among ATC and Credit Suisse First Boston Corporation            (**10.12)

        10.10     Registration Rights Agreement, dated as of February 4, 1999, by
                  and among ATC and Credit Suisse First Boston Corporation        (**10.13)

        10.11     Amended and Restated Registration Rights Agreement, dated as of
                  February 25, 1999, by and among ATC and each of the Parties
                  named therein                                                   (**1014)

        10.12     Agreement to Sublease, dated as of August 6, 1999, by and
                  between AirTouch Communications, Inc., the other parties named
                  therein as Sublessors, ATC and American Tower, L.P.             (+10.1)

        10.13     Stock Purchase Agreement, dated as of August 11, 1999, between
                  ATC Teleports, Inc., ICG Holdings, Inc. and ICG Satellite
                  Services                                                        (+10.2)
        10.14     Purchase and Sale Agreement, dated as of September 10, 1999, by
                  and among ATC and AT&T Corp., a New York corporation            (*******10.1)

        10.15     Amended and Restated Loan Agreement, dated as of January 6,
                  2000, among American Tower, L.P., American Towers, Inc. and ATC
                  Teleports, Inc., as Borrowers and Toronto Dominion (Texas)
                  Inc., as Administrative Agent, and the Bank Parties thereto
                                                                                  (****10.1)

        10.16     ATC Teleports Corporation 1999 Stock Option Plan                (*****10.16)

        10.17     Kline Iron & Steel Co., Inc. 2000 Stock Option Plan             (*****10.17)

        10.18     American Tower Corporation 2000 Employee Stock Purchase Plan    (*****10.18)

                                      II-3
<PAGE>
<CAPTION>

        Exhibit   Description of Document                                         Exhibit File No.
        --------  ------------------------                                        ----------------
        No.
        ---
       <S>       <C>                                                             <C>

        12        Statement Regarding Computation of Ratios of Earnings to Fixed
                  Charges                                                         Filed as Exhibit 12(********)

        21        Subsidiaries of ATC                                             Filed as Exhibit 21(********)

        23        Consent of Sullivan & Worcester LLP                             Contained in the opinion of Sullivan &
                                                                                  Worcester LLP filed as part of
                                                                                  Exhibits 5 and 8(********)

        23.1      Independent Auditors' Consent--Deloitte & Touche LLP            Filed herewith as Exhibit 23.1

        23.2      Accountants' Consent - KPMG LLP                                 Filed herewith as Exhibit 23.2

        23.3      Accountants' Consent - KPMG LLP                                 Filed herewith as Exhibit 23.3

        24        Power of Attorney                                               Filed as page II-6 of the Registration
                                                                                  Statement(********)
</TABLE>


Item 22. Undertakings.

(a)   The undersigned Registrant hereby undertakes:

     (1) To file,  during any period in which  offers or sales are being made, a
     post-effective amendment to this registration statement:

          (i) To include  any  prospectus  required  by section  10(a)(3) of the
          Securities Act of 1933;

          (ii)To reflect in the prospectus any facts or events arising after the
          effective  date of the  registration  statement  (or the  most  recent
          post-effective  amendment  thereof)  which,  individually  or  in  the
          aggregate, represent a fundamental change in the information set forth
          in this registration  statement.  Notwithstanding  the foregoing,  any
          increase  or decrease  in volume of  securities  offered (if the total
          dollar  value of  securities  offered  would not exceed that which was
          registered)  and  any  deviation  from  the  low  or  high  end of the
          estimated  maximum  offering  range  may be  reflected  in the form of
          prospectus filed with the Commission pursuant to Rule 424(b) under the
          Securities Act of 1933 if, in the aggregate, the changes in volume and
          price  represent  no more than a 20% change in the  maximum  aggregate
          offering  price set forth in the  "Calculation  of  Registration  Fee"
          table in this registration statement; and

          (iii) To include any material  information with respect to the plan of
          distribution not previously  disclosed in this registration  statement
          or any  material  change  to such  information  in  this  registration
          statement;

     provided,  however, that the undertakings set forth in paragraphs (a)(1)(i)
     and (a)(1)(ii) above do not apply if the registration  statement is on Form
     S-3  or  Form  S-8,  and  the  information  required  to be  included  in a
     post-effective  amendment  by those  paragraphs  is  contained  in periodic
     reports  filed  with  or  furnished  to the  Commission  by the  Registrant
     pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 that
     are incorporated by reference in this registration statement.

     (2) That, for the purpose of determining any liability under the Securities
     Act of 1933, each such post-effective amendment shall be deemed to be a new
     registration  statement relating to the

                                      II-4
<PAGE>

     securities  offered  therein,  and the offering of such  securities at that
     time shall be deemed to be the initial bona fide offering thereof.

     (3) To remove from registration by means of a post-effective  amendment any
     of the securities  being  registered which remain unsold at the termination
     of the offering.

          (b) The undersigned registrant hereby undertakes that, for purposes of
          determining  any  liability  under the  Securities  Act of 1933,  each
          filing of the Registrant's  annual report pursuant to Section 13(a) or
          15(d) of the Securities  Exchange Act of 1934 that is  incorporated by
          reference in the  registration  statement  shall be deemed to be a new
          registration statement relating to the securities offered therein, and
          the offering of such securities at that time shall be deemed to be the
          initial bona fide offering thereof.

          (c)  Insofar as  indemnification  for  liabilities  arising  under the
          Securities  Act of 1933 may be  permitted to  directors,  officers and
          controlling  persons  of the  Registrant  pursuant  to the  provisions
          referred to in Item 15 of this registration  statement,  or otherwise,
          the  Registrant has been advised that in the opinion of the Securities
          and Exchange Commission such  indemnification is against public policy
          as expressed in the Securities Act and is,  therefore,  unenforceable.
          In the event that a claim for indemnification against such liabilities
          (other than the payment by the Registrant of expenses incurred or paid
          by a director,  officer or controlling person of the Registrant in the
          successful  defense of any action,  suit or proceeding) is asserted by
          such director,  officer or controlling  person in connection  with the
          securities  being  registered,  the  Registrant  will,  unless  in the
          opinion of its  counsel  the matter  has been  settled by  controlling
          precedent,  submit to a court of appropriate jurisdiction the question
          whether  such  indemnification  by  it is  against  public  policy  as
          expressed  in the  Securities  Act and will be  governed  by the final
          adjudication of such issue.

          (d) The undersigned registrant hereby undertakes:

               (1) To file an  application  for the purpose of  determining  the
               eligibility of the trustee to act under subsection (a) of Section
               310 of the Trust  Indenture Act in accordance  with the rules and
               regulations  prescribed by the Commission under Section 305(b)(2)
               of the Act.

          (e)  The  undersigned  registrant  hereby  undertakes  to  respond  to
          requests for  information  that is  incorporated by reference into the
          prospectus  pursuant to Item 4, 10(b), 11, or 13 of this form,  within
          one  business  day  of  receipt  of  such  request,  and to  send  the
          incorporated  documents  by first class mail or other  equally  prompt
          means.  This  includes   information   contained  in  documents  filed
          subsequent to the effective date of the registration statement through
          the date of responding to the request.

          (f) The undersigned registrant hereby undertakes to supply by means of
          a post-effective  amendment all information  concerning a transaction,
          and the company  being  acquired  involved  therein,  that was not the
          subject of and included in the  registration  statement when it became
          effective.


                                      II-5
<PAGE>

                                   SIGNATURES

Pursuant  to  the  requirements  of the  Securities  Act of  1933,  the  Company
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-4 and has  duly  caused  this  registration
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of Boston, Commonwealth of Massachusetts, on the 4th day
of August, 2000.

                                       AMERICAN TOWER CORPORATION


                                       By: /s/ Steven B Dodge*
                                           Steven B. Dodge
                                           Chairman  of the  Board,  President
                                           and Chief Executive Officer

Pursuant to the requirements of the Securities Act of 1933, this Amendment No. 1
to  Registration  Statement  has been signed below by the  following  persons on
behalf of the Company and in the capacities and on the dates indicated.

  Signature                             Title                           Date

/s/ Steven B. Dodge*       Chairman, President, Chief             August 4, 2000
Steven B. Dodge            Executive Officer and Director

/s/ Joseph L. Winn*        Chief Financial Officer and            August 4, 2000
Joseph L. Winn             Treasurer

/s/ Justin D. Benincasa    Vice President and Corporate           August 4, 2000
Justin D. Benincasa        Controller

*Individually and as Attorney-in Fact

/s/ Alan L. Box*           Executive Vice President and           August 4, 2000
Alan L. Box                Director

_______________________    Director                               August 4, 2000
Arnold L. Chavkin

/s/ Dean H. Eisner*        Director                               August 4, 2000
Dean H. Eisner


                                      II-6
<PAGE>



_____________________      Executive Vice President and           August 4, 2000
J.Michael Gearon, Jr.      Director

/s/ Fred R. Lummis*        Director                               August 4, 2000
Fred R. Lummis

/s/ Randall Mays*          Director                               August 4, 2000
Randall Mays

/s/ Thomas H. Stoner*      Director                               August 4, 2000
Thomas H. Stoner

_____________________      Director                               August 4, 2000
Maggie Wilderotter

                                      II-7
<PAGE>

                                  EXHIBIT INDEX

Listed  below are the  exhibits  which  are  filed as part of this  Registration
Statement on Form S-4  (according to the number  assigned to them in Item 601 of
Regulation  S-K).  Each exhibit marked by a (+) is  incorporated by reference to
the filing of ATC's Quarterly Report on Form 10-Q (File No. 001-14195) on August
16, 1999.  Each  exhibit  marked by a (++) is  incorporated  by reference to the
filing of ATC's  Registration  Statement on Form S-3 (File No. 333-37988) on May
26, 2000.  Each exhibit  marked by a (+++) is  incorporated  by reference to the
filing of ATC's  Registration  Statement  on Form S-3 (File  No.  333-89345)  on
October 20, 1999.  Each exhibit marked by a (++++) is  incorporated by reference
to the filing of ATC's  Current  Report on Form 8-K filed on February  24, 2000.
Each exhibit marked by a (+++++) is  incorporated  by reference to the filing of
ATC's  Registration  Statement on Form S-1 (File No.  333-50111) filed on May 8,
1998.  Each  exhibit  marked by a (++++++) is  incorporated  by reference to the
filing of Amendment No. 2 to ATC's Registration  Statement on Form S-1 (File No.
333-52481)  filed on June 30, 1998. Each exhibit marked by a (*) is incorporated
by reference to the filing of ATC's Registration Statement on Form S-4 (File No.
333-76083) on January 15, 1999. Each exhibit marked by a (**) is incorporated by
reference to the filing of ATC's Annual Report on Form 10-K (File No. 001-14195)
filed on March 19,  1999.  Each  exhibit  marked by a (***) is  incorporated  by
reference to ATC's Registration Statement on Form S-4 (File No. 333-46025) filed
on  February  10,  1998.  Each  exhibit  marked by a (****) is  incorporated  by
reference to the filing of ATC's Current Report on Form 8-K filed on January 28,
2000.  Each  exhibit  marked by a (*****) is  incorporated  by  reference to the
filing of ATC's Annual Report on Form 10-K (File No.  001-14195)  filed on March
29, 2000.  Each exhibit marked by a (******) is incorporated by reference to the
filing of ATC's Quarterly Report on Form 10-Q (File No. 001-14195) on August 14,
1998.  Each exhibit  marked by a (*******) is  incorporated  by reference to the
filing of ATC's  Current  Report on Form 8-K filed on September  17, 1999.  Each
exhibit  marked by a (********)  is  incorporated  by reference to the filing of
ATC's  Registration  Statement on Form S-4 (File No. 333-39030) on June 9, 2000.
Exhibit  numbers in  parenthesis  refer to the exhibit  number in the applicable
filing.
<TABLE>
<CAPTION>

        Exhibit   Description of Document                                         Exhibit File No.
        --------  ------------------------                                        ----------------
        No.
        ---
       <S>       <C>                                                             <C>

        3.1       Restated Certificate of Incorporation, as amended, of the
                  Company as filed with the Secretary of State of the State of
                  Delaware on June 4, 1999                                        (+3(i))

        3.2       By-Laws, as amended, of the Company                             (++3.2)

        4.1       Indenture, by and between the Company and The Bank of New York
                  as Trustee,  for the 6.25% Notes, dated as of October 4, 1999,
                  including form of 6.25% Note                                    (+++4.1)

        4.2       Indenture by and between the Company and The Bank of New York
                  as Trustee, for the 2.25% Notes, dated as of October 4, 1999,
                  including the form of 2.25% Note.                               (+++4.2)

        4.3       Form of 6.25% Note (included in Exhibit 4.1)                    Filed as part of Exhibit 4.1(+++)

        4.4       Form of 2.25% Note (included in Exhibit 4.2)                    Filed as part of Exhibit 4.2(+++)

        4.5       Registration Rights Agreement, by and between the Company and
                  the Initial Purchasers named therein, dated as of October 4,
                  1999                                                            (+++4.5)

        4.6       Indenture, by and between the Company and The Bank of New York
                  as Trustee, for the 5.0% Notes, dated as of February 15, 2000,
                  including form of 5.0% Note                                     (++++4.1)

                                      II-8
<PAGE>
<CAPTION>

        Exhibit   Description of Document                                         Exhibit File No.
        --------  ------------------------                                        ----------------
        No.
        ---
       <S>       <C>                                                             <C>

        4.7       Form of 5.0% Note (included in Exhibit 4.6)                     Filed as part of Exhibit 4.1(++++)

        4.8       Registration Rights Agreement, by and between the Company and
                  the Initial Purchasers named therein, dated as of February 15,
                  2000                                                            Filed as Exhibit 4.5(++++)

        5         Opinion of Sullivan & Worcester LLP                             Filed as Exhibit 5(********)

        8         Tax Opinion of Sullivan & Worcester LLP                         Filed as Exhibit 8(********)

        10.1      American Tower Systems Corporation 1997 Stock Option Plan,
                  dated as of November 5, 1997, as amended and restated on April
                  27, 1998                                                        (+++++10.26)

        10.1A     Amendment to the Amended and Restated American Tower
                  Corporation 1997 Stock Option Plan as Amended and Restated on
                  April 27, 1998                                                  (*****10.1A)

        10.2      American Tower Systems Corporation Stock Purchase Agreement,
                  dated as of January 8, 1998, by and among ATC and the
                  Purchasers                                                      (***10.27)

        10.3      Employment Agreement, dated as of January 22, 1998, by and
                  between ATC by and between ATI and J. Michael Gearon, Jr.       (***10.28)

        10.4      Letter of Agreement, dated as of April 13, 1998, by and between
                  ATC and Douglas Wiest                                           (*10.22)

        10.5      ARS-ATS Separation Agreement,  dated as of June 4, 1998 by and
                  among   American   Radio  Systems   Corporation,   a  Delaware
                  Corporation ("ARS"), ATC and CBS Corporation                    (++++++10.30)

        10.6      Securities Purchase Agreement, dated as of June 4, 1998 by and
                  among ATC, Credit Suisse First Boston  Corporation and each of
                  the Purchasers named therein                                    (++++++10.31)

        10.7      Registration  Rights  Agreement,  dated June 4,  1998,  by and
                  among ATC, Credit Suisse First Boston  Corporation and each of
                  the Parties named therein                                       (++++++10.32)

        10.8      Registration Rights Agreement, dated as of January 22, 1998, by
                  and among ATC and each of the Parties named therein             (******10.3)

        10.9      Stock Purchase Agreement, dated as of February 4, 1999, by and
                  among ATC and Credit Suisse First Boston Corporation            (**10.12)

        10.10     Registration Rights Agreement, dated as of February 4, 1999, by
                  and among ATC and Credit Suisse First Boston Corporation        (**10.13)

        10.11     Amended and Restated Registration Rights Agreement, dated as of
                  February 25, 1999, by and among ATC and each of the Parties
                  named therein                                                   (**1014)

                                      II-9
<PAGE>
<CAPTION>

        Exhibit   Description of Document                                         Exhibit File No.
        --------  ------------------------                                        ----------------
        No.
        ---
       <S>       <C>                                                             <C>

        10.12     Agreement to Sublease, dated as of August 6, 1999, by and
                  between AirTouch Communications, Inc., the other parties named
                  therein as Sublessors, ATC and American Tower, L.P.             (+10.1)

        10.13     Stock Purchase Agreement, dated as of August 11, 1999, between
                  ATC Teleports, Inc., ICG Holdings, Inc. and ICG Satellite
                  Services                                                        (+10.2)
        10.14     Purchase and Sale Agreement, dated as of September 10, 1999, by
                  and among ATC and AT&T Corp., a New York corporation            (*******10.1)

        10.15     Amended and Restated Loan Agreement, dated as of January 6,
                  2000, among American Tower, L.P., American Towers, Inc. and ATC
                  Teleports, Inc., as Borrowers and Toronto Dominion (Texas)
                  Inc., as Administrative Agent, and the Bank Parties thereto
                                                                                  (****10.1)

        10.16     ATC Teleports Corporation 1999 Stock Option Plan                (*****10.16)

        10.17     Kline Iron & Steel Co., Inc. 2000 Stock Option Plan             (*****10.17)

        10.18     American Tower Corporation 2000 Employee Stock Purchase Plan    (*****10.18)

        12        Statement Regarding Computation of Ratios of Earnings to
                  Fixed Charges                                                   Filed as Exhibit 12(********)

        21        Subsidiaries of ATC                                             Filed as Exhibit 21(********)

        23        Consent of Sullivan & Worcester LLP                             Contained in the opinion of Sullivan &
                                                                                  Worcester LLP filed as part of
                                                                                  Exhibits 5 and 8(********)

        23.1      Independent Auditors' Consent--Deloitte & Touche LLP            Filed herewith as Exhibit 23.1

        23.2      Accountants' Consent - KPMG LLP                                 Filed herewith as Exhibit 23.2

        23.3      Accountants' Consent - KPMG LLP                                 Filed herewith as Exhibit 23.3

        24        Power of Attorney                                               Filed as page II-6 of the Registration
                                                                                  Statement(********)

</TABLE>

                                     II-10


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