AMERICAN TOWER CORP /MA/
424B3, 2000-06-13
COMMUNICATIONS SERVICES, NEC
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                                                Filed Pursuant to Rule 424(b)(3)
                                                      Registration No. 333-37988

PROSPECTUS

                                 $1,000,000,000

                                     [LOGO]

                           American Tower Corporation

              Debt Securities, Preferred Stock, Depositary Shares,
                        Class A Common Stock and Warrants
                             ----------------------
     We may from time to time offer:

o    debt securities,

o    shares of our preferred stock,

o    fractional shares of our preferred stock in the
     form of depositary shares,

o    shares of our Class A common stock, or

o    warrants to purchase any of these securities.

     The securities we offer will have an aggregate  public offering price of up
to $1,000,000,000.

     We will show the particular securities we offer and their specific terms in
a  supplement  to this  document.  In each case we would  describe  the type and
amount of securities we are offering, the initial public offering price, and the
other terms of the offering.

     Our Class A common stock is listed on the New York Stock Exchange under the
symbol  "AMT." We will  make  application  to list any  shares of Class A common
stock sold pursuant to a supplement to this  prospectus on the NYSE. We have not
determined  whether we will list any of the other securities we may offer on any
exchange  or  over-the-counter  market.  If we  decide  to seek  listing  of any
securities, the supplement will disclose the exchange or market.

     Investing in our securities involves risks. See "Risk Factors" beginning on
page 1.

     Neither the  Securities and Exchange  Commission  nor any state  securities
commission has approved or disapproved of these securities or determined if this
prospectus  is truthful or  complete.  Any  representation  to the contrary is a
criminal offense.

     We may offer the securities  directly,  through agents designated from time
to  time by us or to or  through  underwriters  or  dealers.  We will  show in a
supplement the names of any agents or  underwriters  involved in the sale of any
securities.  We will also  describe  any  applicable  purchase  price and fee or
commission or discount arrangement between or among us and/or them. See "Plan of
Distribution"  on page 20. We may not sell any securities  without delivery of a
supplement describing the method and terms of the offering of the securities.

Our principal place of business is 116 Huntington Avenue, Boston,  Massachusetts
02116 and our telephone number is (617) 375-7500.

                   The date of this prospectus is June 7, 2000
<PAGE>
           TABLE OF CONTENTS

    About This Prospectus........................(i)
    Cautionary Note Regarding Forward-
         Looking Statements......................(i)
    American Tower...............................  1
    Risk Factors.................................  1
    Ratio of Earnings to Fixed Charges............ 5
    Use of Proceeds..............................  5
    Description of Certain Indebtedness........... 5
    Description of Debt Securities................ 7
    Description of Capital Stock..................12
    Description of Depositary Shares..............17
    Description of Warrants.......................19
    Plan of Distribution..........................20
    Validity of the Offered Securities............21
    Experts.......................................21
    Where You Can Find More Information.......... 22
    Documents Incorporated By Reference.......... 22

    You  should  rely  only on the  information  incorporated  by  reference  or
provided in this  document.  We have not  authorized  anyone else to provide you
with different  information.  We are not making an offer of these  securities in
any  jurisdiction  where  it  is  unlawful.  You  should  not  assume  that  the
information in this prospectus is accurate as of any date other than the date on
the front of this document.

                              ABOUT THIS PROSPECTUS

    This  prospectus is part of a  registration  statement we filed with the SEC
using a "shelf" registration process.  Under this shelf process, we may sell any
combination  of the  securities  described  in  this  prospectus  in one of more
offerings  up to a  total  dollar  amount  of  proceeds  of $1.0  billion.  This
prospectus  provides you with a general  description  of the  securities  we may
offer.  Each time we sell  securities,  we will provide a prospectus  supplement
containing specific information about the terms of that offering. The prospectus
supplement  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" on page 22 and "Documents  Incorporated By Reference" on
page 22.

              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.

    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 1. 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.

                                      -i-
<PAGE>
                                 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 10,600
     multi-user  sites  in the  United  States,  Mexico  and  Canada,  including
     approximately 300 broadcast tower sites.

o    We provide  comprehensive network development services 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.

o    We are a leading  provider of domestic and  international  satellite and IP
     network service.  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    Internet, voice, data and video transmission services--20.0%.

                                  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.  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.

Meeting payments on our large debt could be a burden to us.

    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 sell some of our core assets. This could be harmful
to our business and our securityholders.  Market conditions or our own financial
situation may require us to make these sales on unattractive terms.

Demand for tower space may be beyond our control.

    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 antennae 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    zoning, environmental and other government regulations, and

o    technological changes.

    Roaming and resale  arrangements  could also adversely affect demand.  These
arrangements  enable a wireless service provider to serve customers  outside its
license area through  agreements with other providers.  Wireless providers might
consider

                                      -1-
<PAGE>

roaming and resale arrangements preferable to leasing antennae space.

New  tower   construction,   particularly   build-to-suit   projects,   involves
uncontrollable risks and increasing competition.

    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 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  activities also involve other substantial risks.
These risks include:

 o   increasing our debt and the amount of payments on that debt,

 o   uncontrollable risks that could delay or increase the cost of a project,

 o   increasing   competition  for  construction  sites  and  experienced  tower
     construction companies, resulting in significantly higher costs and failure
     to meet time schedules,

 o   failure to meet time schedules that could result in our paying  significant
     penalties to prospective tenants, particularly in build-to-suit situations,
     and

o    possible  lack of  sufficient  experienced  personnel to manage an expanded
     construction program.

    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.

Our acquisition strategy involves increasing acquisition costs, high debt levels
and potential management and integration issues.

    Increased  competition,  which we believe  will  continue,  has  resulted in
substantially  higher acquisition  costs,  particularly for towers being sold by
wireless service providers.  These prices, in turn, result in high debt and debt
service requirements.  Equally important, the increased size of our acquisitions
from wireless  service  providers could create 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    potential antitrust  constraints,  either in local markets or on a regional
     or  national  basis,  that  could  impede  future  acquisitions  or require
     selective divestitures at unfavorable prices.

    An  additional  risk we face when  acquiring  large numbers of towers in one
transaction is that some of these towers may have limited  marketing  potential.
For example, towers may not be marketable because of location.

Covenants in our credit facilities could impede our growth strategy and restrict
our ability to pay interest on or redeem our notes.

    Our growth  strategy may be impaired by restrictive  covenants in our credit
facilities.  The  most  significant  of these  covenants  impose  limits  on our
aggregate  borrowings,  including  in the case of  American  Tower,  the  parent
company, the type and amount of borrowings. We are also required to meet certain
financial  ratios and comply with all of the  financial  and other  covenants in
order to borrow funds.  Certain types of  acquisitions  and investments in other
companies are limited.  Events beyond our control may affect our ability to meet
these  requirements.  If these  covenants  restrict our ability

                                      -2-
<PAGE>

to borrow funds, acquisitions and construction will be impeded.

    Our credit  facilities also restrict the ability of our  subsidiaries to pay
dividends or make other  distributions  to us and prohibit  those  dividends and
other distributions  during periods of default.  Since we are a holding company,
with no independent  operations,  we are dependent on our subsidiaries for funds
to pay interest and  principal on our notes,  including  any debt  securities we
offer pursuant to this prospectus. In addition, our credit facilities require us
to invest  100% of all debt and  equity  offerings,  public or  private,  in our
borrower subsidiaries.

    Our existing  credit  facilities  prohibit us from redeeming or repurchasing
any currently outstanding notes for cash. This will probably require us to elect
to  repurchase  currently  outstanding  notes with  Class A common  stock on the
repurchase  dates and to obtain lender consent in order to repurchase  currently
outstanding notes upon any change in control.  This same limitation could impact
our ability to redeem or repurchase any securities we may offer pursuant to this
prospectus.

We are dependent on key personnel and would be hurt if they leave.

    The  loss of our  chief  executive  officer,  Steven  B.  Dodge,  and  other
executive  officers 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  and our  other  executive
officers. Our ability to raise capital is dependent in part on the reputation of
Mr.  Dodge.  You  should  be aware  that we have  not  entered  into  employment
agreements with Mr. Dodge or most of our other executive officers. We may not be
able  to  retain  our  executive  officers,   including  those  with  employment
agreements,  or other key  personnel or prevent them from  competing  with us if
they did leave.

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.

Demand  for  teleport  services  is subject to  technological,  competitive  and
regulatory factors beyond our control.

    Demand  for  teleport  services  by its  primary  historical  base of  video
customers  has  been  diverted  to fiber  optic  transmission  services  in some
instances.   Teleport  transmission  services  for  Internet-related   entities,
however,  have increased.  Revenues from these new technologies may not continue
to grow  and may  decline  if  other  forms  of  transmission,  fiber  optic  or
otherwise,  are introduced.  In addition,  our teleport satellite operations are
dependent upon maintaining valid FCC licensing.

     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. The results of several substantial

                                      -3-
<PAGE>

studies by the scientific  community in recent years have been inconclusive.  We
and the  lessees  of  antennae  sites on our towers  are  subject to  government
regulations  relating  to radio  frequency  emissions.  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  provided by the carriers  and our own  experience
with comparable  towers.  Neither our auditors,  AirTouch's  auditors nor AT&T's
auditors  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.

We could have liability under environmental laws.

    Under various federal,  state and local environmental laws, we, as an owner,
lessee or operator of real estate,  may be liable for the  substantive  costs of
remediating soil and groundwater contaminated by hazardous wastes. Some of these
laws  impose  responsibility  and  liability  on us even if we did not cause the
contamination  or even  know  about  it.  Almost  all of the  towers  we own and
operate, other than roof top towers, are located on parcels of land, which could
result in substantial environmental liability. Our liability often will continue
even if we sell the property.

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

     Our  payment  of  principal  and  interest  on any debt we may  issue  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.  Any debt we issue
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 any debt we may sell publicly.

No trading market may exist for any offered securities other than Class A common
stock.

     No trading  market  for any  offered  securities  other than Class A common
stock may exist and one may never develop.  Accordingly,  you may not be able to
sell those  securities or sell them at an acceptable  price. If a market were to
develop,  those offered  securities  could trade at prices that may be higher or
lower than your purchase price depending on many factors,  including  prevailing
interest rates, our operating results,  the market for similar securities,  and,
if those  securities are  convertible or  exchangeable,  the market price of the
Class A common stock. We do not intend to list any offered securities other than
Class  A  common  stock  on any  securities  exchange  or to seek  approval  for
quotation through any automated  quotation  system.  One or more of the managing
underwriters,  if  any,  may  decide  to  make a  market  in the  those  offered
securities.  They would not, however,  be obligated to do so and may discontinue
market  making at any time.  Therefore,  any  liquidity  may disappear and those
offered securities may not be readily marketable.


                                      -4-
<PAGE>
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 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.

Our common stock does not pay dividends.

    We have never paid a dividend  on our common  stock and do not expect to pay
cash dividends in the foreseeable  future.  In addition,  our credit  facilities
effectively  restrict the payment of cash dividends or other  distributions  and
the repurchase, redemption or other acquisition of equity securities.

                       RATIO OF EARNINGS TO FIXED CHARGES

    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
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.  We have not paid dividends on preferred stock
in any other period  presented  below. For each of the periods listed below, our
ratio of earnings to fixed  charges was less than 1.0:1.  We had a deficiency in
earnings to fixed charges in each period as follows (amounts in thousands):

                   Period                     Deficiency
                   ------                     ----------
Period from July 17, 1995 (incorp-
   oration) to December 31, 1995........          $ 184
Year ended December 31, 1996............            434
Year ended December 31, 1997............          2,507
Year ended December 31, 1998............         43,844
Year ended December 31, 1999............         52,520
Three months ended March 31, 2000.......         53,595

                                 USE OF PROCEEDS

    We  expect  to use net  proceeds  from  the sale of the  offered  securities
primarily to finance construction and acquisitions.  We also expect to use those
proceeds to finance general working capital  requirements,  including  repayment
from time to time of borrowings under our credit  facilities.  Any borrowings so
repaid may be available in the future to finance  construction  and acquisitions
and other general  corporate  purposes.  We intend to continue  actively seeking
construction  and  acquisition  prospects,  including  acquisitions of companies
outside  of the  United  States  engaged  in  businesses  related  to the  tower
communications business in which we are not presently engaged.

                       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 22. 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,
                                      -5-
<PAGE>
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 convertible notes issued in October 1999 and February 2000, 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.

    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.

Convertible Notes

    In October 1999, we issued 6.25%  Convertible Notes due 2009 in an aggregate
principal  amount of $300.0 million and 2.25%  Convertible  Notes due 2009 at an
issue price of $300.1 million,  representing 70.52% of their principal amount at
maturity of $425.5 million.  In February 2000, we issued 5.00% Convertible Notes
due 2010 in an aggregate  principal  amount of $450.0  million.  We will accrete
each year as interest expense in our financial statements the difference between
the issue price and the principal amount at maturity of the 2.25% notes.

    The 6.25% notes are  convertible  into  shares of Class A common  stock at a
conversion  price of $24.40  per share.  The 2.25%  notes are  convertible  into
shares of Class A common  stock at a conversion  price of $24.00 per share.  The
5.00% notes are convertible  into shares of Class A common stock at a conversion
price of $51.50 per share.  The  conversion  prices are subject to adjustment in
certain customary circumstances.

    We may not redeem the 6.25% notes prior to October 22, 2002. Thereafter,  we
may 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. We may not redeem the 2.25% notes prior to October 22,
2003. Thereafter,  we may redeem those notes, at our option, in whole or in part
at increasing  redemption  prices designed to reflect the accrued original issue
discount.  We may not  redeem  the  5.00%  notes  prior to  February  20,  2003.
Thereafter,  we may 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.  We are also required to pay accrued and

                                      -6-
<PAGE>
unpaid interest in all redemptions of any series of notes.

    Holders  may  require us to  repurchase  all or any of their  6.25% notes on
October 22, 2006 at their  principal  amount,  together  with accrued and unpaid
interest.  Holders may require us to repurchase  all or any of their 2.25% notes
on October 22, 2003 at those notes'  issue price plus  accreted  original  issue
discount,  together with accrued and unpaid interest.  Holders may require us to
repurchase  all or any of  their  5.00%  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 any  series in cash or shares of
Class A common stock, or any combination thereof. Our credit facilities restrict
our ability to repurchase the convertible notes for cash.

    The  indentures  under which the  convertible  notes are  outstanding do not
contain any restrictions on the payment of dividends,  the incurrence of debt or
liens or the  repurchase of our equity  securities  or any financial  covenants.
None of the notes are  entitled to the benefit of any  sinking  fund.  The 6.25%
notes,  the 2.25%  notes and the 5.00% notes are junior to debt under our credit
facilities and rank equally with each other.

                         DESCRIPTION OF DEBT SECURITIES

    The debt securities will be our unsecured  direct  obligations.  They may be
senior or  subordinated  indebtedness.  The debt securities will be issued under
one or more indentures  between us and a trustee.  Any indenture will be subject
to, and governed by, the Trust Indenture Act of 1939, as amended. The statements
made in this prospectus  relating to any indenture and the debt securities to be
issued under any indenture are  summaries of certain  anticipated  provisions of
the  indentures,  do not  purport to be  complete  and are  subject  to, and are
qualified in their  entirety by reference to, all  provisions of the  indentures
and the debt securities.

General

    We have  filed  with the  registration  statement  relating  to the  offered
securities a form of indenture  relating to our senior  securities and a form of
indenture  relating  to our  senior  subordinated  securities  and  subordinated
securities. Our senior debt securities will rank equally and ratably in right of
payment with other  indebtedness of ours that is not  subordinated.  If we issue
subordinated  debt securities,  they will be subordinated in right of payment to
the prior payment in full of senior  indebtedness,  as defined in the applicable
prospectus  supplement,  and  may  rank  equally  and  ratably  with  any  other
subordinated  indebtedness.  They may, however, also be subordinated in right of
payment to senior subordinated securities. See "--Subordination" on page 12.

    We may issue the debt  securities  without  limit as to aggregate  principal
amount,  in one or more series, in each case as established from time to time in
or pursuant to authority granted by a resolution of our board of directors or as
established in one or more supplemental  indentures.  We need not issue all debt
securities of one series at the same time. Unless we otherwise  provide,  we may
reopen a  series,  without  the  consent  of the  holders  of such  series,  for
issuances of additional securities of that series.

    We  anticipate  that any  indenture  will provide that we may, but need not,
designate more than one trustee under an indenture,  each with respect to one or
more series of debt securities. Any trustee under any indenture may resign or be
removed with respect to one or more series of debt  securities,  and a successor
trustee may be appointed to act with respect to that series.

    The  applicable  prospectus  supplement  will  describe the  specific  terms
relating  to the  series of debt  securities  we will  offer,  including,  where
applicable, the following:

o    the title and series  designation  and whether they are senior  securities,
     senior subordinated securities or subordinated securities,

o    the aggregate principal amount of the securities,

o    the  percentage  of the  principal  amount at which we will  issue the debt
     securities and, if other than the principal  amount of the debt securities,
     the portion of the  principal  amount of the debt  securities  payable upon
     declaration of acceleration of the maturity of the debt securities,

o    if convertible, the initial conversion price, the conversion period and any
     other terms governing such conversion,

o    the stated maturity date,

                                      -7-
<PAGE>
o    any fixed or variable interest rate or rates per annum,

o    the date from which interest may accrue and any interest payment dates,

o    any sinking fund requirements,

o    any  provisions  for  redemption,  including the  redemption  price and any
     remarketing arrangements,

o    whether the securities are  denominated or payable in United States dollars
     or a foreign currency or units of two or more foreign currencies,

o    the events of  default  and  covenants  of such  securities,  to the extent
     different from or in addition to those described in this prospectus,

o    whether we will issue the debt securities in certificated and/or book-entry
     form,

o    whether the debt securities will be in registered or bearer form and, if in
     registered  form,  the  denominations  if other than in even  multiples  of
     $1,000 and, if in bearer form, the  denominations  and terms and conditions
     relating thereto,

o    whether we will issue any of the debt  securities in permanent  global form
     and, if so, the terms and  conditions,  if any, upon which interests in the
     global  security may be exchanged,  in whole or in part, for the individual
     debt securities represented by the global security,

o    the  applicability,  if any,  of the  defeasance  and  covenant  defeasance
     provisions described in this prospectus or any prospectus supplement,

o    whether we will pay additional  amounts on the securities in respect of any
     tax, assessment or governmental charge and, if so, whether we will have the
     option to redeem the debt securities instead of making this payment, and

o    the subordination provisions, if any, relating to the debt securities.

    We may issue debt securities at less than the principal  amount payable upon
maturity.  We refer to these securities as "original issue discount securities."
If  material  or  applicable,  we will  describe  in the  applicable  prospectus
supplement special U.S. federal income tax, accounting and other  considerations
applicable to original issue discount securities.

    Except as described  under  "--Merger,  Consolidation  or Sale of Assets" on
page 9 or as may be set forth in any  prospectus  supplement,  an indenture will
not  contain  any  other  provisions  that  would  limit  our  ability  to incur
indebtedness or that would afford holders of the debt  securities  protection in
the event of a highly  leveraged or similar  transaction  involving us or in the
event of a change  of  control.  You  should  review  carefully  the  applicable
prospectus  supplement  for  information  with  respect to events of default and
covenants applicable to the securities being offered.

Denominations, Interest, Registration and Transfer

    Unless otherwise described in the applicable prospectus supplement,  we will
issue the debt  securities  of any  series  that are  registered  securities  in
denominations  that are even multiples of $1,000,  other than global securities,
which may be of any denomination.

    Unless otherwise specified in the applicable prospectus supplement,  we will
pay the interest on and principal of and premium, if any, on any debt securities
at the corporate  trust office of the trustee.  At our option,  however,  we may
make payment of interest by check  mailed to the address of the person  entitled
to the payment as it appears in the  applicable  register or by wire transfer of
funds to that person at an account maintained within the United States.

    If we do not  punctually  pay or duly  provide for  interest on any interest
payment date, the defaulted interest will be paid either:

o   to the person in whose name the debt  security is registered at the close of
    business on a special record date to be fixed by the applicable trustee or

o    in any  other  lawful  manner,  all as  more  completely  described  in the
     applicable indenture.

    You may have your debt  securities  broken  into  more  debt  securities  of
smaller   denominations  or  combined  into  fewer  debt  securities  of  larger
denominations,  as long as the total  principal  amount is not changed.  We call
this an "exchange."

    You may exchange or transfer  debt  securities at the office of the trustee.
The trustee acts as our agent

                                      -8-
<PAGE>
for registering  debt securities in the names of holders and  transferring  debt
securities.  We may change  this  appointment  to  another  entity or perform it
ourselves.  The entity performing the role of maintaining the list of registered
holders is called the "security registrar." It will also perform transfers.

    You will not be  required  to pay a service  charge to  transfer or exchange
debt  securities,  but  you  may  be  required  to pay  for  any  tax  or  other
governmental  charge  associated  with the  exchange or  transfer.  The security
registrar  will make the transfer or exchange only if it is satisfied  with your
proof of ownership.

Merger, Consolidation or Sale of Assets

    Under any indenture, we are generally permitted to consolidate or merge with
another company.  We are also permitted to sell  substantially all of our assets
to  another  company,  or to buy  substantially  all of the  assets  of  another
company.  However, we may not take any of these actions unless all the following
conditions are met:

o   If we merge out of existence or sell our assets, the other company must be a
    corporation, partnership or other entity organized under the laws of a State
    or the District of Columbia or under  federal  law.  The other  company must
    agree to be legally responsible for the debt securities.

o   The merger,  sale of assets or other transaction must not cause a default on
    the debt securities.  In addition, we must not already be in default, unless
    the merger or other transaction  would cure the default.  A default for this
    purpose  would  include  any event  that would be an event of default if the
    requirements for giving us default notice or our default having to exist for
    a specific period of time were disregarded.

Events of Default and Related Matters

    Events of Default.  The term "event of default" means any of the following:

o    We do not pay the  principal  or any premium on a debt  security on its due
     date.

o    We do not pay interest on a debt security within 30 days of its due date.

o    We do not deposit any sinking fund payment on its due date.

o    We remain in breach of any other term of the  applicable  indenture  for 60
     days after we receive a notice of default stating we are in breach.  Either
     the trustee or holders of 25% of the principal amount of debt securities of
     the affected series may send the notice.

o    We file for bankruptcy or certain other events in bankruptcy, insolvency or
     reorganization occur.

o    Any  other  event  of  default  described  in  the  applicable   prospectus
     supplement occurs.

    Remedies If an Event of Default Occurs.  If an event of default has occurred
and has not been cured,  the trustee or the holders of at least 25% in principal
amount of the debt  securities  of the  affected  series may  declare the entire
principal  amount  of all  the  debt  securities  of that  series  to be due and
immediately payable. We call this a declaration of acceleration of maturity.  If
an event of default occurs  because of certain events in bankruptcy,  insolvency
or  reorganization,  the  principal  amount of all the debt  securities  of that
series will be automatically  accelerated,  without any action by the trustee or
any holder.  At any time after the trustee or the holders have  accelerated  any
series of debt  securities,  but before a judgment  or decree for payment of the
money due has been  obtained,  the holders of at least a majority  in  principal
amount  of the  debt  securities  of the  affected  series  may,  under  certain
circumstances, rescind and annul such acceleration.

    Except in cases of default,  where the trustee has some special duties,  the
trustee is not required to take any action under the applicable indenture at the
request  of  any  holders  unless  the  holders  offer  the  trustee  reasonable
protection  from expenses and  liability.  We refer to this as an indemnity.  If
reasonable indemnity is provided,  the holders of a majority in principal amount
of the outstanding securities of the relevant series may direct the time, method
and place of  conducting  any lawsuit or other formal  legal action  seeking any
remedy  available to the  trustee.  These  majority  holders may also direct the
trustee in performing any other action under the applicable  indenture,  subject
to certain limitations.

    Before you bypass the  trustee  and bring your own  lawsuit or other  formal
legal  action  or take  other  steps to  enforce  your  rights or  protect  your
interests relating to the debt securities, the following must occur:

                                      -9-
<PAGE>
o    You must give the  trustee  written  notice  that an event of  default  has
     occurred and remains uncured.

o    The  holders  of at  least  25% in  principal  amount  of  all  outstanding
     securities  of the  relevant  series must make a written  request  that the
     trustee  take  action  because of the  default,  and must offer  reasonable
     indemnity to the trustee  against the cost and other  liabilities of taking
     that action.

o    The  trustee  must have not taken  action for 60 days after  receipt of the
     above notice and offer of indemnity.

    However,  you are entitled at any time to bring a lawsuit for the payment of
money due on your security after its due date.

    We will furnish to the trustee every year a written  statement of certain of
our officers  certifying  that to their  knowledge we are in compliance with the
applicable indenture and the debt securities, or else specifying any default.

Modification of an Indenture

    There are three types of changes we can make to the  indentures and the debt
securities:

     Changes Requiring Your Approval. First, there are changes we cannot make to
your debt  securities  without your  specific  approval.  Following is a list of
those types of changes:

o    change the stated maturity of the principal or interest on a debt security,

o    reduce any amounts due on a debt security,

o    reduce the amount of principal payable upon acceleration of the maturity of
     a debt security following a default,

o    change the place or currency of payment on a debt security,

o    impair your right to sue for payment,

o    modify the subordination provisions, if any, in a manner that is adverse to
     you,

o    reduce the percentage of holders of debt securities whose consent is needed
     to modify or amend an indenture,

o    reduce the percentage of holders of debt securities whose consent is needed
     to waive  compliance  with certain  provisions  of an indenture or to waive
     certain defaults, and

o    modify any other aspect of the  provisions  dealing with  modification  and
     waiver of an indenture.

    Changes Requiring a Majority Vote. The second type of change to an indenture
and the debt  securities is the kind that requires a vote in favor by holders of
debt  securities  owning a majority of the  principal  amount of the  particular
series  affected.  Most changes fall into this  category,  except for clarifying
changes and certain other changes that would not adversely affect holders of the
debt securities.  We require the same vote to obtain a waiver of a past default.
However,  we cannot obtain a waiver of a payment  default or any other aspect of
an indenture or the debt securities listed in the first category described above
under  "--Changes  Requiring  Your  Approval"  unless we obtain your  individual
consent to the waiver.

    Changes Not  Requiring  Approval.  The third type of change does not require
any vote by holders of debt securities.  This type is limited to  clarifications
and certain other changes that would not  adversely  affect  holders of the debt
securities.

     Further  Details  Concerning  Voting.  When taking a vote,  we will use the
following  rules to decide  how much  principal  amount to  attribute  to a debt
security:

o    For original issue discount  securities,  we will use the principal  amount
     that would be due and  payable on the voting  date if the  maturity  of the
     debt securities were accelerated to that date because of a default.

o    For debt  securities  whose  principal  amount is not known,  we will use a
     special  rule for that  security  described  in the  applicable  prospectus
     supplement. An example is if the principal amount is based on an index.

o    For  debt  securities  denominated  in one or more  foreign  currencies  or
     currency units, we will use the U.S. dollar equivalent.

    Debt securities are not considered  outstanding,  and therefore not eligible
to vote,  if we have  deposited  or set  aside in trust  for you money for their
payment  or  redemption  or if we or  one  of  our  affiliates  own  them.  Debt
securities  are also not
                                      -10-
<PAGE>
eligible to vote if they have been fully defeased as described immediately below
under "--Discharge, Defeasance and Covenant Defeasance--Full Defeasance."

    We are generally entitled to set any day as a record date for the purpose of
determining the holders of outstanding securities entitled to vote or take other
action under an indenture. If we set a record date, only persons who are holders
of outstanding  securities of the applicable  series on the record date may vote
or take the  action.  Moreover,  the  applicable  holders  must vote or take the
action within 180 days  following the record date or another  period that we may
specify. We may shorten or lengthen this period from time to time.

Discharge, Defeasance and Covenant Defeasance

    Discharge.  We may discharge  some  obligations  to holders of any series of
debt  securities  that either have become due and payable or will become due and
payable  within one year,  or  scheduled  for  redemption  within  one year,  by
irrevocably  depositing  with the  trustee,  in trust,  funds in the  applicable
currency  in an amount  sufficient  to pay the debt  securities,  including  any
premium and interest.

    Full  Defeasance.  We can,  under  particular  circumstances,  effect a full
defeasance  of your  series of debt  securities.  By this we mean we can legally
release  ourselves from any payment or other  obligations on the debt securities
if we put in place the following arrangements to repay you:

o    We must  deposit  in trust for your  benefit  and the  benefit of all other
     direct  holders  of the debt  securities  a  combination  of money and U.S.
     government  or U.S.  government  agency  notes or bonds that will  generate
     enough cash to make interest,  principal and any other payments on the debt
     securities on their various due dates.

o    The current federal tax law must be changed or an IRS ruling must be issued
     permitting  the above deposit  without  causing you to be taxed on the debt
     securities  any  differently  than if we did not make the  deposit and just
     repaid the debt  securities  ourselves.  Under current federal tax law, the
     deposit and our legal release from the debt securities  would be treated as
     though we took back your  debt  securities  and gave you your  share of the
     cash and  notes or bonds  deposited  in  trust.  In that  event,  you could
     recognize gain or loss on the debt securities you give back to us.

o    We must  deliver  to the  trustee a legal  opinion  confirming  the tax law
     change described above.

    If we did accomplish full  defeasance,  you would have to rely solely on the
trust deposit for repayment on the debt securities. You could not look to us for
repayment in the unlikely event of any shortfall.  Conversely, the trust deposit
would most likely be protected from claims of our lenders and other creditors if
we ever  became  bankrupt  or  insolvent.  You would also be  released  from any
subordination provisions.

    Covenant  Defeasance.  Under  current  federal tax law, we can make the same
type of deposit  described  above and be released  from some of the  restrictive
covenants in the debt securities.  This is called "covenant defeasance." In that
event,  you would lose the protection of those  restrictive  covenants but would
gain the  protection of having money and  securities set aside in trust to repay
the securities and you would be released from any subordination  provisions.  In
order to achieve covenant defeasance, we must do the following:

o   We must  deposit  in trust for your  benefit  and the  benefit  of all other
    direct  holders  of the debt  securities  a  combination  of money  and U.S.
    government  or U.S.  government  agency  notes or bonds  that will  generate
    enough cash to make  interest,  principal and any other payments on the debt
    securities on their various due dates.

o   We must deliver to the trustee a legal opinion confirming that under current
    federal income tax law we may make the above deposit  without causing you to
    be taxed on the debt securities any differently  than if we did not make the
    deposit and just repaid the debt securities ourselves.

    If  we  accomplish  covenant  defeasance,  the  following  provisions  of an
indenture and the debt securities would no longer apply:

o    Any covenants  applicable to the series of debt securities and described in
     the applicable prospectus supplement.

o    Any subordination provisions.

o    Certain events of default  relating to breach of covenants and acceleration
     of the maturity of other debt set forth in any prospectus supplement.

    If we accomplish covenant defeasance, you can still look to us for repayment
of the debt securities if

                                      -11-
<PAGE>
a shortfall in the trust deposit  occurred.  If one of the  remaining  events of
default  occurs,  for example,  our bankruptcy,  and the debt securities  become
immediately  due and payable,  there may be a shortfall.  Depending on the event
causing the default, you may not be able to obtain payment of the shortfall.

Subordination

    We will set  forth in the  applicable  prospectus  supplement  the terms and
conditions,  if any, upon which any series of senior subordinated  securities or
subordinated  securities is subordinated to debt securities of another series or
to other indebtedness of ours. The terms will include a description of:

o    the indebtedness ranking senior to the debt securities being offered,

o    the  restrictions on payments to the holders of the debt  securities  being
     offered  while  a  default  with  respect  to the  senior  indebtedness  is
     continuing,

o    the restrictions, if any, on payments to the holders of the debt securities
     being offered following an event of default, and

o    provisions  requiring holders of the debt securities being offered to remit
     some payments to holders of senior indebtedness.

Global Securities

    If so set forth in the applicable  prospectus  supplement,  we may issue the
debt  securities  of a  series  in  whole  or in part in the form of one or more
global  securities  that will be deposited  with a depositary  identified in the
prospectus  supplement.  We may issue global  securities in either registered or
bearer form and in either temporary or permanent form. The specific terms of the
depositary  arrangement  with respect to any series of debt  securities  will be
described in the prospectus supplement.

                          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, including by any applicable Certificates of Designation. We refer to it
as the restated  certificate.  We have  incorporated  by reference a copy of the
restated  certificate as an exhibit to the registration  statement of which this
prospectus  is a part.  This summary is subject to and qualified by reference to
the  description  of the  particular  terms of your  series of  preferred  stock
described in the applicable prospectus supplement.

General

    Our  authorized  capital stock  consists of  20,000,000  shares of preferred
stock,  $.01 par value per share,  500,000,000  shares of Class A common  stock,
$.01 par value per share,  50,000,000  shares of Class B common stock,  $.01 par
value per share, and 10,000,000  shares of Class C common stock,  $.01 par value
per share.

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    if the shares are  convertible,  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, and

                                      -12-
<PAGE>
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.  In
addition,  the rights of holders of common  stock will be subject to, and may be
adversely  affected by, the rights of holders of any preferred stock that we may
issue in the future.

    The following  description  of the  preferred  stock sets forth some general
terms and provisions of the preferred stock to which a prospectus supplement may
relate.  The statements below describing the preferred stock are in all respects
subject to and  qualified  in their  entirety  by  reference  to the  applicable
provisions of our restated certificate, including any applicable certificates of
designation, and our by-laws.

    The  prospectus  supplement  will  describe  the  specific  terms as to each
issuance of preferred stock, including:

o    the number of shares of the preferred stock offered,

o    the offering price of the preferred stock,

o    the  dividend  rate,  when  dividends  will  be  paid,  or  the  method  of
     determining  the dividend rate if it is based on a formula or not otherwise
     fixed,

o    the date from which dividends on the preferred stock shall accumulate,

o    the provisions for any auctioning or remarketing,  if any, of the preferred
     stock,

o    the provision, if any, for redemption or a sinking fund,

o    the liquidation preference per share,

o    any listing of the preferred stock on a securities exchange,

o    whether the preferred  stock will be  convertible  and, if so, the security
     into which it is  convertible  and the terms and  conditions of conversion,
     including the conversion price or the manner of determining it,

o    whether  interests in the preferred stock will be represented by depositary
     shares as more fully described under  "Description of Depositary Shares" on
     page 17,

o    a discussion of federal income tax considerations,

o    the relative  ranking and preferences of the preferred stock as to dividend
     and liquidation rights,

o    any  limitations on issuance of any preferred stock ranking senior to or on
     a parity with the series of  preferred  stock being  offered as to dividend
     and liquidation rights,

o    any  limitations  on direct or  beneficial  ownership and  restrictions  on
     transfer, and

o    any other specific terms, preferences,  rights, limitations or restrictions
     of the preferred stock.

    As described under "Description of Depositary Shares" on page 17, we may, at
our option,  elect to offer depositary shares evidenced by depositary  receipts.
If we elect to do this,  each  depositary  receipt  will  represent a fractional
interest in a share of the particular  series of the preferred  stock issued and
deposited with a depositary.  The applicable  prospectus supplement will specify
that fractional interest.

    Rank. Unless our board of directors  otherwise  determines and we so specify
in the  applicable  prospectus  supplement,  we expect that the preferred  stock
will, with respect to dividend rights and rights upon  liquidation,  rank senior
to all common stock.

    Dividends.  Holders of  preferred  stock of each  series will be entitled to
receive cash and/or  stock  dividends at the rates and on the dates shown in the
applicable prospectus supplement.  Even though the preferred stock may specify a
fixed dividend, our board of directors must declare those dividends and they may
be paid only out of assets of legally available for payment.  Each dividend will
be payable to holders of record as they  appear on our stock  transfer  books on
the record dates fixed by our board of directors. In the case of preferred stock
represented by depositary  receipts,  the records of the depositary  referred to
under  "Description of Depositary  Shares" on page 17 will determine the persons
to whom dividends are payable.

                                      -13-
<PAGE>
    Dividends  on any series of preferred  stock (we refer to that  series,  for
ease  of  reference,   as  the   "applicable   series")  may  be  cumulative  or
noncumulative,  as provided in the applicable prospectus supplement.  Cumulative
dividends  will be  cumulative  from and after the date shown in the  applicable
prospectus supplement.  If our board of directors fails to declare a dividend on
any applicable series that is  noncumulative,  the holders will have no right to
receive,  and we will have no  obligation  to pay, a dividend  in respect of the
applicable dividend period, whether or not dividends on that series are declared
payable in the future.

    If the applicable  series is entitled to a cumulative  dividend,  we may not
declare, or pay or set aside for payment, any full dividends on any other series
of preferred stock ranking,  as to dividends,  on a parity with or junior to the
applicable series,  unless we declare,  and either pay or set aside for payment,
full cumulative dividends on the applicable series for all past dividend periods
and the then current dividend period.  If the applicable  series does not have a
cumulative  dividend,  we must declare,  and pay or set aside for payment,  full
dividends  for the then current  dividend  period only.  When  dividends are not
paid,  or set aside for  payment,  in full upon any  applicable  series  and the
shares  of any  other  series  ranking  on a  parity  as to  dividends  with the
applicable  series,  we must  declare,  and pay or set  aside for  payment,  all
dividends   upon  the   applicable   series   and  any   other   parity   series
proportionately,  in accordance with accrued and unpaid dividends of the several
series.  For these purposes,  accrued and unpaid dividends do not include unpaid
dividend periods on  noncumulative  preferred stock. No interest will be payable
in respect of any dividend payment that may be in arrears.

    Except  as  provided  in the  immediately  preceding  paragraph,  unless  we
declare, and pay or set aside for payment, full cumulative dividends,  including
for the then current period,  on any cumulative  applicable  series,  we may not
declare,  or pay or set aside for payment,  any dividends or other distributions
upon common stock or any other capital  stock  ranking  junior to or on a parity
with the applicable  series as to dividends or upon  liquidation.  The foregoing
restriction  does not apply to dividends or other  distributions  paid in common
stock or other  capital  stock  ranking  junior to the  applicable  series as to
dividends and upon liquidation.

    If the applicable series is noncumulative,  we need only declare, and pay or
set  aside  for  payment,  the  dividend  for the then  current  period,  before
declaring  dividends  or  distributions  on  common  stock or  junior  or parity
securities.  In addition,  under the  circumstances  that we could not declare a
dividend, we may not redeem, purchase or otherwise acquire for any consideration
any common stock or other parity or junior capital stock, except upon conversion
into or exchange for common stock or other junior capital stock.

    We  may,  however,  make  purchases  and  redemptions  otherwise  prohibited
pursuant to certain  redemptions or pro rata offers to purchase the  outstanding
shares of the applicable series and any other parity series of preferred stock.

    We will credit any  dividend  payment  made on an  applicable  series  first
against the earliest accrued but unpaid dividend due with respect to the series.

    Redemption.  We may have the right  and/or  may be  required  to redeem  the
preferred stock, as a whole or in part, in each case upon the terms, if any, and
at the times and at the  redemption  prices shown in the  applicable  prospectus
supplement.

    Liquidation  Preference.  The applicable prospectus supplement will show the
liquidation   preference  of  the  applicable  series.  Upon  any  voluntary  or
involuntary  liquidation,  before any distribution may be made to the holders of
common stock or any other capital stock ranking  junior in the  distribution  of
assets upon any liquidation to the applicable series, the holders of that series
will be  entitled  to  receive,  out of assets  of ours  legally  available  for
distribution to  stockholders,  liquidating  distributions  in the amount of the
liquidation  preference,  plus an  amount  equal to all  dividends  accrued  and
unpaid.  In the case of a noncumulative  applicable  series,  accrued and unpaid
dividends  include only the then current dividend  period.  After payment of the
full amount of the  liquidating  distributions  to which they are entitled,  the
holders of preferred  stock will have no right or claim to any of our  remaining
assets. If liquidating distributions shall have been made in full to all holders
of preferred stock,  our remaining assets will be distributed  among the holders
of  any  other  capital  stock  ranking  junior  to  the  preferred  stock  upon
liquidation,  according  to  their  rights  and  preferences  and in  each  case
according to their number of shares.

    If, upon any voluntary or involuntary liquidation,  our available assets are
insufficient  to  pay  the  amount  of  the  liquidating  distributions  on  all
outstanding shares of an applicable series and the corresponding amounts payable
on all shares of other capital stock

                                      -14-
<PAGE>
ranking on a parity in the  distribution  of assets with that  series,  then the
holders of that series and all other equally  ranking  capital stock shall share
ratably in the distribution in proportion to the full liquidating  distributions
to which they would otherwise be entitled.

    For these  purposes,  our  consolidation  or  merger  with or into any other
corporation  or  other  entity,  or the  sale,  lease  or  conveyance  of all or
substantially all of our property or business,  will not be deemed to constitute
our liquidation.

    Voting  Rights.  Holders  of the  preferred  stock  will not have any voting
rights, except as otherwise from time to time required by law or as indicated in
the applicable prospectus supplement.

    Conversion Rights. We will show in the applicable  prospectus supplement the
terms and  conditions,  if any,  upon which you may,  or we may  require you to,
convert  shares of any series of preferred  stock into common stock or any other
class or series of capital  stock  will be shown.  The terms  will  include  the
number of shares of common stock or other  securities  into which the shares are
convertible,  the  conversion  price,  or the  manner  of  determining  it,  the
conversion period,  provisions as to whether conversion will be at the option of
the holders of the series or at our option,  the events  requiring an adjustment
of the conversion price, and provisions affecting conversion upon the redemption
of shares of the series.

    Our Exchange Rights.  We will show in the applicable  prospectus  supplement
the terms and  conditions,  if any,  upon which we can  require  you to exchange
shares of any series of preferred  stock for junior  subordinated  debt or other
debt  securities.   If  an  exchange  is  required,   you  will  receive  junior
subordinated  debt or other debt securities with a principal amount equal to the
liquidation  preference of the applicable  series of preferred  stock. The other
terms will include the terms and provisions of the junior  subordinated  debt or
other debt  securities  which will not be materially  less favorable to you than
those of the series of preferred stock being exchanged.

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 that  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 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 that may be
outstanding from time to time and under our credit  facilities.  See "--Dividend
Restrictions" on page 16.

    Voting  Rights.  Except as otherwise  required by law and in the election of
directors, and subject to the rights of holders of any series of preferred stock
that may be outstanding  from time to time,  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.  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

                                      -15-
<PAGE>
     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 a  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.

    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 include certain family members and other holders of Class
B common stock.

    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 any holders of the  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.  However,  if shares of capital
stock or other securities of any other company are distributed,  they may differ
as to voting  rights to the same extent that voting rights then differ among the
different classes of our 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.

    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 our
common stock is Harris Trust and Savings Bank, 311 West Monroe Street,  Chicago,
Illinois 60606. Its telephone number is (312) 461-4600.

Dividend Restrictions

    Our credit  facilities  prohibit our borrower  subsidiaries from paying cash
dividends or  distributions,  or from  purchasing or otherwise  acquiring  their
capital stock or other equity interests.  However,  beginning on April 15, 2004,
if no  default  exists or would be  created  under the  credit  facilities,  our
borrower  subsidiaries may pay cash dividends or make other  distributions of up
to 50% of excess cash flow, for the preceding calendar year.

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 stockholders. 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,
15.0% or more of the voting power of the corporation's  shares

                                      -16-
<PAGE>
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.

                        DESCRIPTION OF DEPOSITARY SHARES

    General.  The  description  shown  below  and in any  applicable  prospectus
supplement of certain  provisions of any deposit agreement and of the depositary
shares and depositary receipts  representing  depositary shares does not purport
to be complete  and is subject to and  qualified in its entirety by reference to
the  forms  of  deposit  agreement  and  depositary  receipts  relating  to each
applicable  series of preferred stock. The deposit  agreement and the depositary
receipts  contain the full legal text of the matters  described in this section.
We will file a copy of those documents with the SEC at or before the time of the
offering of the  applicable  series of  preferred  stock.  This  summary also is
subject to and qualified by reference to the description of the particular terms
of your series of  depositary  shares  described  in the  applicable  prospectus
supplement.

    We may,  at our option,  elect to offer  fractional  interests  in shares of
preferred  stock,  rather than shares of preferred  stock.  If we exercise  this
option, we will appoint a depositary to issue depositary  receipts  representing
those  fractional  interests.  Preferred  stock of each  series  represented  by
depositary  shares will be deposited under a separate deposit  agreement between
us and the  depositary.  The  prospectus  supplement  relating  to a  series  of
depositary  shares will show the name and address of the depositary.  Subject to
the terms of the applicable deposit  agreement,  each owner of depositary shares
will  be  entitled  to all  of the  dividend,  voting,  conversion,  redemption,
liquidation and other rights and preferences of the preferred stock  represented
by those depositary shares.

    The  depositary  shares will be  evidenced  by  depositary  receipts  issued
pursuant to the  applicable  deposit  agreement.  Upon  surrender of  depositary
receipts  at the  office of the  depositary,  and upon  payment  of the  charges
provided  in and  subject  to the terms of the  deposit  agreement,  a holder of
depositary  shares  is  entitled  to  receive  the  shares  of  preferred  stock
underlying the surrendered depositary receipts.

    Dividends  and  Other  Distributions.  A  depositary  will  be  required  to
distribute all cash dividends or other cash distributions received in respect of
the  applicable  preferred  stock to the record  holders of depositary  receipts
evidencing  the  related  depositary  shares  in  proportion  to the  number  of
depositary receipts owned by the holders.  Fractions will be rounded down to the
nearest whole cent.

    If the  distribution is other than in cash, a depositary will be required to
distribute  property received by it to the record holders of depositary receipts
entitled  thereto,  unless the depositary  determines that it is not feasible to
make the distribution. In that case, the depositary may, with our approval, sell
the property and distribute the net proceeds from the sale to the holders.

    No  distributions  will be  made on any  depositary  shares  that  represent
preferred stock converted or exchanged.  The deposit agreement will also contain
provisions  relating to the manner in which any  subscription  or similar rights
offered by us to  holders  of the  preferred  stock  will be made  available  to
holders of depositary  shares.  All  distributions are subject to obligations of
holders to file proofs,  certificates  and other  information and to pay certain
charges and expenses to the depositary.

    Withdrawal of Preferred Stock. You may receive the number of whole shares of
your series of preferred  stock and any money or other  property  represented by
those  depositary  receipts after  surrendering  the depositary  receipts at the
corporate trust office of the depositary. Partial shares of preferred stock will
not be issued. If the depositary shares which you surrender exceed the number of
depositary  shares that represent the number of whole shares of preferred  stock
you wish to withdraw, then the depositary will deliver to you at the same time a
new depositary receipt  evidencing the excess number of depositary shares.  Once
you have withdrawn your preferred  stock, you will not be entitled to re-deposit
that preferred stock under the deposit agreement in order to receive  depositary
shares.  We do not  expect  that there  will be any  public  trading  market for
withdrawn shares of preferred stock.

    Redemption  of  Depositary  Shares.  If we redeem a series of the  preferred
stock underlying the depositary  shares,  the depositary shares will be redeemed
from the proceeds received by the depositary  resulting from the redemption,  in
whole or in part, of the series held by the depositary. The depositary will mail
notice of redemption  not less than 30 and not more than 60 days before the date
fixed for redemption to the record holders of the depositary receipts evidencing
the  depositary  shares we are  redeeming  at their  addresses  appearing in the
depositary's  books.  The redemption price per depositary share will be equal to
the applicable

                                      -17-
<PAGE>
fraction of the redemption price per share payable with respect to the series of
the preferred  stock.  Whenever we redeem shares of preferred  stock held by the
depositary, the depositary will redeem as of the same redemption date the number
of depositary  shares relating to shares of preferred  stock so redeemed.  If we
are redeeming less than all of the depositary shares, the depositary will select
the depositary  shares we are redeeming by lot or pro rata as the depositary may
determine.

    After the date  fixed for  redemption,  the  depositary  shares  called  for
redemption  will no longer be deemed  outstanding.  All rights of the holders of
the  depositary  shares and the related  depositary  receipts will cease at that
time,  except  the right to  receive  the money or other  property  to which the
holders of depositary shares were entitled upon redemption. Receipt of the money
or other  property is subject to surrender to the  depositary of the  depositary
receipts evidencing the redeemed depositary shares.

    Voting of the  Preferred  Stock.  Upon  receipt of notice of any  meeting at
which the holders of the  applicable  preferred  stock are  entitled to vote,  a
depositary will be required to mail the  information  contained in the notice of
meeting to the record holders of the applicable depositary receipts. Each record
holder of depositary receipts on the record date, which will be the same date as
the record date for the  preferred  stock,  will be  entitled  to  instruct  the
depositary as to the exercise of the voting  rights  pertaining to the amount of
preferred stock represented by the holder's  depositary  shares.  The depositary
will try, as  practical,  to vote the shares as you  instruct.  We will agree to
take all  reasonable  action that the  depositary  deems  necessary  in order to
enable  it to do so.  If you do not  instruct  the  depositary  how to vote your
shares, the depositary will abstain from voting those shares.

    Liquidation   Preference.   Upon  our  liquidation,   whether  voluntary  or
involuntary,  the  holders  of each  depositary  share will be  entitled  to the
fraction of the  liquidation  preference  accorded each share of preferred stock
represented  by the  depositary  share,  as shown in the  applicable  prospectus
supplement.

    Conversion or Exchange of Preferred  Stock.  The depositary  shares will not
themselves be convertible into or exchangeable for common stock, preferred stock
or any of our other securities or property. Nevertheless, if so specified in the
applicable prospectus supplement,  the depositary receipts may be surrendered by
holders to the applicable depositary with written instructions to it to instruct
us to cause  conversion of the preferred  stock  represented  by the  depositary
shares.  Similarly, if so specified in the applicable prospectus supplement,  we
may require you to surrender all of your  depositary  receipts to the applicable
depositary upon our requiring the exchange of the preferred stock represented by
the depositary shares into our debt securities. We will agree that, upon receipt
of the  instruction and any amounts payable in connection with the conversion or
exchange,  we will cause the conversion or exchange using the same procedures as
those  provided  for  delivery of preferred  stock to effect the  conversion  or
exchange.  If you are  converting  only a part  of the  depositary  shares,  the
depositary  will  issue  you  a  new  depositary  receipt  for  any  unconverted
depositary shares.

     Taxation.  As owner of  depositary  shares,  you will be  treated  for U.S.
federal  income tax  purposes as if you were an owner of the series of preferred
stock represented by the depositary shares.  Therefore,  you will be required to
take into account for U.S.  federal income tax purposes income and deductions to
which you would be  entitled  if you were a holder of the  underlying  series of
preferred stock. In addition:

o    no gain or loss will be  recognized  for U.S.  federal  income tax purposes
     upon the withdrawal of preferred stock in exchange for depositary shares as
     provided in the deposit agreement,

o    the tax basis of each share of preferred  stock issued to you as exchanging
     owner  of  depositary  shares  will,  upon  exchange,  be the  same  as the
     aggregate tax basis of the  depositary  shares  exchanged for the preferred
     stock, and

o    if you held the  depositary  shares as a  capital  asset at the time of the
     exchange  for  preferred  stock,  the  holding  period  for  shares  of the
     preferred  stock  will  include  the  period  during  which  you  owned the
     depositary shares.

    Amendment and  Termination  of a Deposit  Agreement.  We and the  applicable
depositary are permitted to amend the provisions of the depositary  receipts and
the  deposit  agreement.  However,  the  holders of at least a  majority  of the
applicable  depositary  shares then  outstanding must approve any amendment that
adds or increases  fees or charges or prejudices an important  right of holders.
Every  holder of an  outstanding  depositary  receipt at the time any  amendment
becomes  effective,  by  continuing  to hold the  receipt,  will be bound by the
applicable deposit agreement as amended.

                                      -18-
<PAGE>
    Any deposit  agreement  may be  terminated by us upon not less than 30 days'
prior written notice to the  applicable  depositary if a majority of each series
of preferred stock affected by the termination consents to the termination. When
that occurs,  the  depositary  will be required to deliver or make  available to
each holder of depositary  receipts,  upon surrender of the depositary  receipts
held by the holder,  the number of whole or fractional shares of preferred stock
as are  represented  by  the  depositary  shares  evidenced  by  the  depositary
receipts,  together with any other property held by the depositary  with respect
to the depositary receipts.  In addition, a deposit agreement will automatically
terminate if:

o    all depositary shares outstanding it shall have been redeemed,

o    there  shall  have been a final  distribution  in  respect  of the  related
     preferred stock in connection  with our  liquidation  and the  distribution
     shall have been made to the holders of depositary  receipts  evidencing the
     depositary shares underlying the preferred stock, or

o    each of the shares of related  preferred stock shall have been converted or
     exchanged into securities not represented by depositary shares.

    Charges  of a  Depositary.  We will pay all  transfer  and  other  taxes and
governmental  charges arising solely from the existence of a deposit  agreement.
In addition,  we will pay the fees and expenses of a  depositary  in  connection
with the initial  deposit of the preferred stock and any redemption of preferred
stock.  However,  holders of depositary  receipts will pay any transfer or other
governmental  charges and the fees and expenses of a  depositary  for any duties
the holders request to be performed that are outside of those expressly provided
for in the applicable deposit agreement.

    Resignation  and Removal of Depositary.  A depositary may resign at any time
by delivering to us notice of its election to do so. In addition,  we may at any
time remove a depositary.  Any  resignation  or removal will take effect when we
appoint a successor depositary and it accepts the appointment. We must appoint a
successor  depositary within 60 days after delivery of the notice of resignation
or removal.  A depositary  must be a bank or trust company  having its principal
office in the United States that has a combined  capital and surplus of at least
$50 million.

    Miscellaneous.  A  depositary  will be  required  to  forward  to holders of
depositary  receipts any reports and communications from us that are received by
it with respect to the related preferred stock.

    Neither  a  depositary  nor we will be  liable  if it is  prevented  from or
delayed in performing its  obligations  under a deposit  agreement by law or any
circumstances  beyond its control.  Our  obligations and those of the depositary
under a deposit  agreement  will be limited to  performing  their duties in good
faith and without  gross  negligence or willful  misconduct.  Neither we nor any
depositary  will be obligated to  prosecute  or defend any legal  proceeding  in
respect of any depositary receipts, depositary shares or related preferred stock
unless  satisfactory  indemnity is  furnished.  We and each  depositary  will be
permitted to rely on written  advice of counsel or  accountants,  on information
provided  by  persons  presenting  preferred  stock for  deposit,  by holders of
depositary receipts,  or by other persons believed in good faith to be competent
to give the information,  and on documents  believed in good faith to be genuine
and signed by a proper party.

    If a depositary receives  conflicting claims,  requests or instructions from
any holders of depositary receipts,  on the one hand, and us, on the other hand,
the depositary shall be entitled to act on the claims,  requests or instructions
received from us.

                             DESCRIPTION OF WARRANTS

    We  may  issue,   together  with  any  other  securities  being  offered  or
separately,  warrants entitling the holder to purchase from or sell to us, or to
receive  from  us the  cash  value  of the  right  to  purchase  or  sell,  debt
securities, preferred stock, depositary shares or common stock. We and a warrant
agent will enter a warrant  agreements  pursuant to which the  warrants  will be
issued.  The warrant agent will act solely as our agent in  connection  with the
warrants and will not assume any obligation or  relationship  of agency or trust
for or with any holders or beneficial owners of warrants. We will file a copy of
the warrants and the warrant agreement with the SEC at or before the time of the
offering of the applicable series of warrants.

    In the case of each series of warrants, the applicable prospectus supplement
will describe the terms of the warrants being offered thereby. These include the
following, if applicable:

o    the offering price,

o    the number of warrants offered,

                                      -19-
<PAGE>
o    the securities underlying the warrants,

o    the exercise  price,  the  procedures  for exercise of the warrants and the
     circumstances,  if any,  that will deem the  warrants  to be  automatically
     exercised,

o    the date on which the warrants will expire,

o    federal income tax consequences,

o    the rights, if any, we have to redeem the warrant,

o    the name of the warrant agent, and

o    the other terms of the warrants.

    Warrants may be exercised at the appropriate  office of the warrant agent or
any other office indicated in the applicable prospectus  supplement.  Before the
exercise of warrants,  holders will not have any of the rights of holders of the
securities  purchasable  upon exercise and will not be entitled to payments made
to holders of the securities.

    The warrant agreements may be amended or supplemented without the consent of
the holders of the  warrants to which it applies to effect  changes that are not
inconsistent  with the  provisions  of the  warrants  and that do not  adversely
affect the interests of the holders of the warrants. However, any amendment that
materially  and adversely  alters the rights of the holders of warrants will not
be  effective  unless  the  holders  of at least a  majority  of the  applicable
warrants then outstanding approve the amendment.  Every holder of an outstanding
warrant at the time any amendment becomes  effective,  by continuing to hold the
warrant,  will be bound by the applicable  warrant agreement as amended thereby.
The  prospectus  supplement  applicable  to a particular  series of warrants may
provide that certain  provisions of the warrants,  including the  securities for
which they may be exercisable,  the exercise price, and the expiration date, may
not be altered without the consent of the holder of each warrant.

                              PLAN OF DISTRIBUTION

    We may sell the offered  securities to one or more  underwriters  for public
offering and sale by them. We may also sell the offered  securities to investors
directly or through  agents.  We will name any  underwriter or agent involved in
the  offer  and sale of the  offered  securities  in the  applicable  prospectus
supplement.

    The distribution of offered  securities may be effected from time to time in
one or more  transactions at a fixed price or prices,  which may be changed,  at
market prices  prevailing  at the time of sale, at prices  related to the market
prices,  or at  negotiated  prices.  In  connection  with  the  sale of  offered
securities,  underwriters  or agents may  receive or be deemed to have  received
compensation  from us or from purchasers in the form of underwriting  discounts,
concessions  or  commissions.  Underwriters  may sell offered  securities  to or
through dealers,  and dealers may receive compensation in the form of discounts,
concessions or commissions from the underwriters or from purchasers.

    We will show any  underwriting  compensation  paid by us to  underwriters or
agents in connection with the offering of offered securities, and any discounts,
concessions or commissions allowed by underwriters to participating  dealers, in
the  applicable  prospectus   supplement.   Underwriters,   dealers  and  agents
participating in the distribution of the offered  securities may be deemed to be
underwriters.  Any discounts,  concessions and commissions  received by them and
any profit realized by them on resale of the offered securities may be deemed to
be  underwriting  discounts and  commissions,  under the Securities Act of 1933.
Underwriters,  dealers and agents may be entitled, under agreements entered into
with us, to  indemnification  against  and  contribution  toward  certain  civil
liabilities, including liabilities under the Securities Act.

    If so indicated in the applicable prospectus  supplement,  we will authorize
underwriters  or other persons acting as our agents to solicit offers by certain
institutions to purchase offered securities from us at the public offering price
shown in the applicable  prospectus  supplement  pursuant to contracts providing
for payment  and  delivery  on a future  date or dates.  Institutions  with whom
contracts may be made include commercial and savings banks, insurance companies,
pension funds,  investment companies,  educational and charitable  institutions,
and other  institutions.  We are  required  to  approve  any  contracts  and the
institutions  that may become  parties to them. Any contracts will be subject to
the condition that the purchase by an institution of the offered securities will
not at the time of delivery be prohibited  under the law of any  jurisdiction in
the  United  States to which the  institution  is  subject.  If a portion of the
offered  securities  is being sold to  underwriters,  the  contract  may also be
subject to the condition that we will have sold to the  underwriters the offered
securities not sold for delayed delivery. The underwriters and the other persons
will not have
                                      -20-
<PAGE>
any responsibility in respect of the validity or performance of the contracts.

    Unless otherwise specified in the related prospectus supplement, each series
of offered securities,  other than shares of Class A common stock, will be a new
issue with no established  trading market. Our Class A common stock is listed on
the NYSE and traded  under the symbol  "AMT." Any shares of Class A common stock
sold pursuant to a prospectus  supplement will be listed on the NYSE, subject to
official  notice of issuance.  We may elect to list any other series or class of
offered  securities on an exchange or on the Nasdaq National Market, but are not
obligated to do so. Any  underwriters to whom offered  securities are sold by us
for  public  offering  and sale may make a market in those  offered  securities.
Underwriters  will  not be  obligated  to  make  any  market,  however,  and may
discontinue  any market making at any time without  notice.  No assurance can be
given as to the liquidity of or the trading markets for any offered securities.

    Certain of the  underwriters and their affiliates may engage in transactions
with and perform  services for us in the  ordinary  course of business for which
they receive compensation.

    The  specific  terms and manner of sale of the  offered  securities  will be
shown or summarized in the applicable prospectus supplement.

                       VALIDITY OF THE OFFERED SECURITIES

    Sullivan & Worcester LLP, Boston, Massachusetts, will pass upon the validity
of the  offered  securities  for us. As of June 1, 2000,  Norman A.  Bikales,  a
member of the firm of Sullivan & Worcester LLP, owned 11,000 shares of our Class
A common  stock and  41,490  shares of Class B common  stock and had  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  of us and certain of
our subsidiaries.

                                     EXPERTS

     The  consolidated   financial  statements  of  American  Tower  Corporation
incorporated in this prospectus by reference from our 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.

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<PAGE>
                       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.

                       DOCUMENTS INCORPORATED BY REFERENCE

    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 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 Report on Form 10-Q for the quarter ended March 31, 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 and May 23, 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.

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